• 专利附录
  • 专利说明
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    • 专利摘要:

    公开号:NL1025354A1
    申请号:NL1025354
    申请日:2004-01-29
    公开日:2004-08-16
    发明作者:Koji Shimoda
    申请人:Toyota Motor Co Ltd；
    IPC主号:
    专利说明:

    DEVICE FOR ADJUSTING THE OUTLINE LENGTH AND METHOD FOR ADJUSTING THE OUTLINE LENGTH OF AN ENDLESS METAL RING
    Background of the Invention 1. Field of the Invention
    The invention relates to an endless metal band or belt formed by annularly arranging a plurality of plate-shaped elements that face each other, and passing an endless metal ring through the elements to annularly connect the elements. More particularly, the invention relates to a device for adjusting the circumferential length and a method for adjusting the circumferential length which improves an accuracy of a circumferential length of an endless metal ring.
    2. Description of the prior art
    There is a vehicle with a continuously variable transmission (hereinafter referred to as "CVT") which continuously adjusts a speed ratio according to a driving condition of the vehicle. The CVT can efficiently transfer an engine power, and contributes to improving economy and driving performance. In one of the CVTs that are practically used, a metal belt and a pair of pulleys are used, and an effective radius of each pulley is changed by a hydraulic pressure so that the speed ratio is changed continuously. In this CVT, an endless metal belt is wrapped around an input side pulley mounted on an input shaft and an output side pulley mounted on an output shaft. Each of the input side pulley and the output side pulley comprises a pair of trays in which a slot width can be changed continuously. By changing the gap width of each of the input side pulley and the output side pulley, a belt winding radius is changed with respect to each of the input side pulley and the output side pulley. Thus, a ratio between the rotational speed of the input shaft and the rotational speed of the output shaft, that is, the speed ratio, can be changed continuously.
    In a known manner, a metal ring used for such an endless metal belt is produced in the following manner. First, both ends of a super-strong steel thin sheet such as maraging steel are joined by welding to form an annular drum. The drum is then cut to a predetermined width and rolled, whereby a metal ring with a predetermined thickness is obtained. The metal ring with the predetermined thickness obtained by rolling is subjected to a heat treatment, and then to a circumferential length adjusting operation, whereby the circumferential length of the metal ring is adjusted to a desired circumferential length. Furthermore, the metal ring is subjected to an aging treatment and a nitration treatment, whereby the hardness of the metal ring is increased. Multiple metal rings with circumferential lengths that are slightly different from each other are laminated to be used for the endless metal belt. Accordingly, adjusting the circumferential length is extremely important for laminating multiple metal rings used for the endless metal belt.
    Japanese Patent Application Laid-Open No. 11/290971 shows a device for adjusting the circumferential length which performs the adjusting of the circumferential length. The apparatus comprises a drive cylinder and a driven cylinder on which a metal ring is mounted, and a correction cylinder provided between the drive cylinder and the driven cylinder.
    In the circumferential length adjusting device described in Japanese Patent Application Laid-Open No. 11/290971, the metal ring is wrapped around the drive cylinder, the driven cylinder, and the correction cylinder. First the driven cylinder is moved so that the metal ring is tensioned. Then, while the driving cylinder is being rotated, a displacement of the driven cylinder is measured by a displacement sensor in which the metal ring is tensioned. A current circumferential length of the metal ring is calculated based on a center-to-center distance between the drive cylinder and the driven cylinder. Based on a difference between the current circumferential length thus obtained and a desired circumferential length, a displacement of the correction cylinder required for adjusting the circumferential length of the metal ring to the desired circumferential length is calculated. By applying a driving force to the correction cylinder to move the correction cylinder over the calculated displacement, the metal ring is plastically deformed. If the current displacement of the correction cylinder corresponds to the calculated displacement, the application of the driving force to the correction cylinder is stopped. The current circumferential length of the metal ring after the adjustment is calculated based on the center distance between the drive cylinder and the driven cylinder while the metal ring is tensioned by the driven cylinder. A difference between the current circumferential length after the adjustment and the desired circumferential length is obtained. If the current circumferential length corresponds to the desired circumferential length, the processing is finished.
    According to such a method for adjusting the circumferential length, an operation of applying the driving force to the correction cylinder must be repeated several times until the current circumferential length of the metal ring is adjusted to the desired circumferential length, which is difficult. Japanese Laid-Open Publication 2001-105050 describes a method for correcting the circumferential length for a metal ring which can easily and reliably adjust a circumferential length of a metal ring to a desired circumferential length.
    The method for correcting the circumferential length described in Japanese Laid-Open Publication 2001-105050 comprises the steps of wrapping a metal ring around a drive cylinder and a driven cylinder which can be relatively displaced in a displacement direction to be away from one another, and a correction cylinder which is provided between the driving cylinder and the driven cylinder, and which can be moved in a direction orthogonal to the displacement direction of the driving cylinder and the driven cylinder; maintaining the driving cylinder and the driven cylinder at a predetermined intermediate distance, and moving the correction cylinder with a predetermined displacement relative to a reference value of the circumferential length of the metal ring in the direction orthogonal to the displacement direction of the drive cylinder and the driven cylinder and in which the metal ring is stretched; obtaining a current circumferential length of the metal ring wrapped around the drive cylinder, the driven cylinder, and the correction cylinder, while the drive cylinder and the driven cylinder are relatively displaced in the direction of movement to be spaced apart by a predetermined force, and wherein the metal ring is tensioned by the driving cylinder and the driven cylinder, comparing the current circumferential length of the metal ring and the reference value of the circumferential length of the metal ring to obtain a difference therebetween, and correcting the displacement of the correction cylinder according to the difference between the current circumferential length of the metal ring and the reference value.
    According to the method for correcting the circumferential length described in Japanese Laid-Open Publication 2001-105050, the drive cylinder and the driven cylinder around which the metal ring is wrapped are held at the predetermined spacing, and the correction cylinder provided between the drive cylinder and the driven cylinder moves in the direction orthogonal to the direction of movement of the drive cylinder and the driven cylinder, and the metal ring is stretched, thereby plastically deforming the metal ring and adjusting the circumferential length. Fundamentally, the correction cylinder is displaced by the predetermined displacement relative to the reference value of the circumferential length of the metal ring. As the reference value, for example, a value is used which, for design and process management, is determined as the peripheral length of the metal ring after rolling and heat treatment. The current circumferential length of the metal ring is obtained while the drive cylinder and the driven cylinder are relatively moved in the direction of movement to be spaced apart by a predetermined force, and the metal ring is tensioned by the drive cylinder and by the driven cylinder. Then the difference between the current circumferential length and the reference value is obtained, and the displacement of the correction cylinder is adjusted according to the difference. Thereby, the displacement of the correction cylinder with respect to the current circumferential length can be obtained based on the reference value. Accordingly, the circumferential length of the metal ring can be easily and reliably adjusted to the desired circumferential length by performing the move displacement of the correction cylinder only once, and the production can be increased.
    After the endless metal ring whose circumferential length is thus adjusted has been removed from the driving cylinder and the driven cylinder, the circumferential length of the endless metal ring shrinks due to elastic deformation compared to when the circumferential length is adjusted. It is possible to increase the spacing between the cylinders to adjust the circumferential length taking into account such a contraction amount of the circumferential length (hereinafter referred to as "rebound amount"). However, the rebound amount varies according to the circumferential length of the endless metal ring before adjustment. Because the circumferential length of the endless metal ring has a deviation before adjustment, the accuracy of the circumferential length of the endless metal ring deteriorates.
    Summary of the invention
    An aspect of the invention relates to a device for adjusting the circumferential length of an endless metal ring in which an endless metal ring is wrapped around the cylinders, and wherein an intermediate distance between the cylinders is increased so that the endless metal ring is stretched when the cylinders are rotated, whereby the endless metal ring is plastically deformed and a circumferential length of the endless metal ring is adjusted to a target circumferential length. The device for adjusting the circumferential length comprises measuring means for measuring the circumferential length of the endless metal ring before the circumferential length is adjusted; and adjusting means for adjusting the circumferential length of the endless metal ring to the target circumferential length by increasing the gap between the cylinders based on the measured circumferential length such that the circumferential length of the endless metal ring when the circumferential length is adjusted is greater than the target circumference length with a contraction amount due to elastic deformation of the endless metal ring after the circumferential length is adjusted, the adjusting means adjusting the circumferential length of the endless metal ring to the desired circumferential length by increasing the spacing between the cylinders based on a degree of the contraction amount due to elastic deformation of the endless metal ring after the circumferential length is adjusted relative to the circumferential length of the endless metal ring before the circumferential length, the degree of contraction amount being obtained in advance, further comprising means for r measuring a volume of the endless metal ring before the circumferential length is adjusted; and means for changing the amount of the contraction amount based on the measured volume.
    In the device according to the invention for adjusting the circumferential length of an endless metal ring, the adjusting means adjust the circumferential length of the endless metal ring to the target circumferential length by increasing the spacing between the cylinders. At that time, the adjusting means increases the spacing between the cylinders based on the circumferential length before adjustment so that the circumferential length of the endless metal ring when the circumferential length is adjusted is greater than the target circumferential length with the contraction amount due to elastic deformation of the endless metal ring after adjustment. Thus, since the circumferential length is adjusted taking into account the contraction amount due to elastic deformation based on the circumferential length before adjustment, the accuracy of the circumferential length of the endless metal ring does not deteriorate even when the circumferential length of the endless metal ring before adjustment has a deviation . Accordingly, it is possible to provide the circumferential length adjusting device which improves the accuracy of the circumferential length of the endless metal ring. The adjusting means increase the spacing between the cylinders based on the amount of contraction amount due to elastic deformation of the endless metal ring (the amount of springback). Because the amount of the contraction amount is essentially determined by the type of metal and the like, the circumferential length can be adjusted without realizing the contraction amount relative to any circumferential length before adjustment. The amount of springback is changed based on the volume of the endless metal ring before adjustment includes the amount of springback varies according to the volume of the endless metal ring before adjustment. Therefore, deterioration of the circumference length accuracy due to influence of volume variation can be suppressed.
    By making use of a degree of contraction amount in advance due to elastic deformation of the endless metal ring generated before and after the adjustment of the circumferential length of the endless metal ring, a deviation of the rebound degree is caused by a deviation of the circumferential length of reduced the endless metal ring for adjustment. Accordingly, a more precise circumferential length of the endless metal ring can be obtained and an accuracy of the circumferential length of the endless metal ring is improved. Since the amount of the contraction amount is changed based on the measured volume of the endless metal ring, the accuracy of the circumferential length of the endless metal ring is further improved.
    The device according to the invention for adjusting the circumferential length of an endless metal ring can further comprise means for measuring a temperature of the endless metal ring when the circumferential length is adjusted; and means for changing the amount of the contraction amount based on the measured temperature. Thus, the amount of rebound is changed based on the temperature of the endless metal ring when the peripheral length is adjusted because the amount of rebound varies according to the temperature of the endless metal ring when the peripheral length is adjusted. Therefore, deterioration of the circumference length accuracy can be suppressed due to the influence of temperature variation of the endless metal ring.
    The device according to the invention for adjusting the circumferential length of an endless metal ring can further comprise means for measuring the circumferential length of the endless metal ring after the circumferential length has been adjusted; and means for changing the amount of the contraction amount based on a difference between the measured circumference length and the target circumference length. Thus, the degree of recoil can be changed so that the difference between the circumferential length of the endless metal ring after adjustment and the target fore-stretch length becomes zero even when the degree of recoil has a deviation due to a deviation of the composition of the endless metal ring which results from a deviation of processing in a preparation process.
    The device according to the invention for adjusting the circumferential length of an endless metal ring can further comprise means for measuring the circumferential length of the endless metal ring after the circumferential length has been adjusted; and means for correcting, based on a difference between the measured circumference length and the target circumference length, the spacing between the cylinders when the circumference length is adjusted, wherein the spacing is calculated taking into account the target circumference length, and at least one of the contraction amount and the degree of the contraction quantity. Thus, the spacing of the cylinders when the circumferential length is adjusted can be changed so that the difference between the circumferential length of the endless metal ring after adjustment and the target circumferential length becomes zero. Accordingly, the circumferential length of the endless metal ring can be adjusted to the target circumferential length with high accuracy even when the degree of recoil has a deviation due to a deviation of a composition of the endless metal ring resulting from a deviation of processing in a preparation process .
    Another aspect of the invention relates to a method for adjusting the circumferential length of an endless metal ring in which an endless metal ring is wrapped around cylinders, and an intermediate distance between the cylinders is increased so that the endless metal ring is stretched when the cylinders are rotated, whereby the endless metal ring is plastically deformed and a circumferential length of the endless metal ring is adjusted to a target circumferential length. The method for adjusting the circumferential length comprises a measuring step of measuring the circumferential length of the endless metal ring before the circumferential length is adjusted; and an adjusting step for adjusting the circumferential length of the endless metal ring to the target circumferential length by increasing the spacing between the cylinders based on the measured circumferential length such that the circumferential length of the endless metal ring when the circumferential length is adjusted exceeds the target circumferential length with a contraction amount due to elastic deformation of the endless metal ring after the circumferential length is adjusted, further comprising the step of adjusting the circumferential length of the endless metal ring to the target circumferential length by increasing the spacing between the cylinders based on an amount of the contraction amount due to elastic deformation of the endless metal ring after the circumferential length is adjusted relative to the circumferential length of the endless metal ring before the circumferential length is adjusted, the degree of contraction amount being obtained in advance and further comprising the steps of measuring a volume of the endless metal ring before the peripheral length is adjusted; and changing the amount of the contraction amount based on the measured volume.
    In the method according to the invention for adjusting the circumferential length of an endless metal ring, the circumferential length of the endless metal ring is adjusted to the target circumferential length by increasing the spacing between the cylinders in the adjusting step. At that time, in the adjusting step, the spacing between the cylinders is increased based on the circumference length before adjustment so that the circumference length of the endless metal ring when the circumference length is adjusted is greater than the target circumference length with the contraction amount due to elastic deformation of the endless metal ring after adjustment. Thus, since the circumferential length is adjusted taking into account the contraction amount due to elastic deformation based on the circumferential length before adjustment, the accuracy of the circumferential length of the endless metal ring does not deteriorate even when the circumferential length of the endless metal ring before adjustment has a deviation. Accordingly, it is possible to improve the accuracy of the circumferential length of the endless metal ring. In the adjusting step, the spacing between the cylinders is increased based on the amount of contraction amount due to elastic deformation of the endless metal ring (the amount of rebound). Because the amount of the contraction amount is substantially determined according to the type of metal and the like, the circumferential length can be adjusted without realizing the contraction amount relative to any circumferential length before adjustment. The amount of rebound changes based on the volume of the endless metal ring before adjustment because the amount of rebound varies according to the volume of the endless metal ring before adjustment. Therefore, deterioration of the circumference length accuracy can be suppressed due to influence of variation in volume.
    The method according to the invention for adjusting the circumferential length of an endless metal ring can further comprise the steps of measuring a temperature of the endless metal ring when the circumferential length is adjusted; and changing the amount of the contraction amount based on the measured temperature. Thus, the amount of rebound is changed based on the temperature of the endless metal ring when the circumferential length is adjusted because the amount of rebound varies according to the temperature of the endless metal ring when the circumferential length is adjusted. Thereby, deterioration of the circumference length accuracy can be suppressed due to influence of temperature variation of the endless metal ring.
    The method according to the invention for adjusting the circumferential length of an endless metal ring may further comprise the steps of measuring the circumferential length of the endless metal ring after the circumferential length has been adjusted; and changing the amount of the contraction amount based on a difference between the measured circumference length and the target circumference length. Thus, the degree of recoil can be changed such that the difference between the circumferential length of the endless metal ring after adjustment and the target circumferential length becomes zero even when the degree of recoil has a deviation due to a deviation of the composition of the endless metal ring resulting from a deviation of processing in a preparation process.
    The method according to the invention for adjusting the circumferential length of an endless metal ring can further comprise the steps of measuring the circumferential length of the endless metal ring after the circumferential length has been adjusted; and correcting, based on a difference between the measured circumference length and the target circumference length, the spacing between the cylinders when the circumference length is adjusted, wherein the spacing is calculated taking into account the stress-to-circumference length, and at least one of the contraction quantity and the degree of contraction quantity. Thus, when the circumferential length is adjusted, the spacing of the cylinders can be changed such that the difference between the circumferential length of the endless metal ring after adjustment and the target circumferential length becomes zero. Accordingly, the circumferential length of the endless metal ring can be adjusted to the target circumferential length with high accuracy even when the degree of recoil has a deviation due to a deviation of the composition of the endless metal ring resulting from a deviation of processing in a preparation process.
    Brief description of the figures
    The above described embodiment and other embodiments, objects, features, advantages, technical and industrial significance of this invention will be better understood by reading the following detailed description of exemplary embodiments of the invention, considered in conjunction with the accompanying figures in which: figure 1 is a sectional view showing a CVT using an endless metal belt whose circumferential length is adjusted by a circumferential length adjusting device according to an embodiment of the invention; Figure 2 is a partial perspective view of the endless metal belt; Figure 3 is a perspective view showing the entire configuration of the endless metal belt; Figure 4 is a front view of an element; Figure 5 is a side view of the element; Figure 6 is a schematic view showing a device for adjusting the circumferential length according to the embodiment of the invention; Figure 7 is a graph showing a relationship between a volume of a ring before a peripheral length thereof has been adjusted and a degree of recoil; Figure 8 is a graph showing a relationship between a ring temperature when the circumferential length thereof is adjusted and the degree of springback; and Figure 9 is a flow chart showing a procedure of control of the circumferential length during adjustment; which is implemented in the circumferential length adjusting device according to the embodiment of the invention.
    Detailed description of the preferred embodiments
    In the following description and the accompanying figures, the present invention will be described in more detail in terms of exemplary embodiments.
    The embodiment of the invention will be described below with reference to the accompanying figures. In the following description, the same components are designated by the same reference numerals. Names and functions are the same. Therefore, a detailed description thereof will not be repeated.
    First, an endless metal belt and a CVT which uses the endless metal belt will be described. The endless metal belt is formed by annularly arranging a plurality of elements facing each other in a direction of the sheet thickness and passing a ring as an endless metal ring through each of the right and left saddle portions of the elements to make the elements annular. to combine.
    Referring to Figure 1, a CVT 100 using an endless metal belt will be described. The endless metal belt is formed using the ring whose circumferential length has been adjusted by a device for adjusting the circumferential length according to the embodiment of the invention. In the CVT 100, an endless metal belt 106 is wrapped around an input side pulley 220 which is mounted on an input shaft 200 and an output side pulley 320 which is mounted on an output shaft 300.
    Each of the input side pulley 220 and the output side pulley 320 comprises a pair of trays 108 in which a gap width can be changed continuously. The gap width of each of the input side pulley 220 and the output side pulley 320 is changed using a hydraulic pressure circuit which is controlled according to a driving condition of a vehicle, whereby each of the belt winding jets of the endless metal belt 106 relative to the input side pulley 220 and the output side pulley 320 is changed. Thus, the ratio between the rotational speed of the input shaft 200 and the rotational speed of the output shaft 300, that is, the speed ratio, can be changed continuously.
    Referring to Figure 2, the endless metal belt 106 will be described. The endless metal belt 106 is formed by annularly arranging a plurality of elements 102 which face each other in plate thickness direction, and passing a ring 104 as an endless metal ring through each of the right and left saddle portions of the elements around the elements 102 to be ring-shaped, as shown in Figure 3.
    An example of a shape of the element 102 is shown in Figure 4 and Figure 5. Both side surfaces of the element 102 in the width direction are referred to as platter-contact friction surfaces 112. The platter-contact friction surfaces 112 are tapered surfaces, and are in contact with and match tapered dish surfaces 110 of the dishes 108. A neck portion 116 extending upwardly is provided in a central portion in the width direction of a base body portion 114 with the dish contact frictional surfaces 112. The neck portion 116 is continuous to a top portion 118 which extends in a lateral direction. Gaps 126 are formed between the top portion 118 which extends in the lateral direction and the base body portion 114. Each ring 104 is passed through each of the two slits 126 on the right and left sides. A surface of the basic body portion 114 with which each ring 104 is in contact is referred to as a saddle surface 120.
    The height of the saddle surfaces 120 is expressed as a dimension of a stab line P which traverses the basic body portion 114. The width of the element 102 is expressed as a dimension on the stitch line P. A convex portion 122 is formed on one of the two surfaces of the element 102 at a position above the neck portion 116. A recess 123 is also formed on the other of both surfaces of the element 102 at the position above the neck portion 116. Thus, the convex portion 122 and the recess 123 of the elements 102 which are adjacent are arranged against each other. The surface of the element 102 with the convex portion 122 is considered a front surface of the element 102. The surface of the element 102 with the recess 123 is considered a rear surface of the element 102.
    As shown in Figure 4, each saddle surface 120 has a curved convex shape. Each ring 104 is in contact with each saddle surface 120 along the curved shape.
    The endless metal belt 106 is disposed between the pair of trays 108. Because the tray surfaces 110 and the tray contact friction surfaces 112 are tapered surfaces, a load is applied to each element 102 in the radial direction due to the pressure force of the trays 108. However, because the elements 102 are connected by the ring 104, movement of the elements 102 outward in the radial direction is limited by tension of the ring 104. As a result, due to the shear force of oil between the dish surfaces 110 and the dish contact, frictional surfaces 112, frictional force generated. Thus, torque is transmitted between the trays 108 and the endless metal belt 106.
    More specifically, the ring 104 comprises nine to twelve rings which are laminated, and connects the elements 102 as shown in Figure 2 and Figure 4 (however, it is shown that the ring 104 comprises three rings instead of nine to twelve rings in Figure 2 and figure 4). In this case, because the ring 104 is arranged as a lower layer, the peripheral length thereof is shorter. When the ring 104 is arranged as a higher layer, its peripheral length is greater.
    Thus, the endless metal belt 106 is formed using the belt 104 which comprises nine to twelve rings 104. The circumferential length of each of the laminated rings 104 is finely adjusted. In a process for producing the ring 104, a thin plate of steel material such as maraging steel is formed in a drum shape by welding. Then, to make the composition of the welded portion uniform, a heat treatment is carried out on the plate. As the heat treatment, for example, the heat treatment is carried out in a vacuum oven for a predetermined time at a predetermined temperature. The thin sheet of steel material with the drum shape is cut into rings, each of which has a predetermined width, and the circumferential length and thickness of each ring is made uniform. Then, to remove processing residual stresses, a heat treatment is performed on the rings. Next, the circumferential length of each ring 104 is finely adjusted. In the process of this fine adjustment, the device for adjusting the circumferential length according to the embodiment of the invention is used.
    Figure 6 is a schematic side view showing an apparatus for adjusting the circumferential length 1000 according to the embodiment of the invention. The device for adjusting the circumferential length 1000 comprises a first cylinder 1010 and a second cylinder 1020 around which a ring 104 is wound, a driving mechanism 1012 for the first cylinder, a driving mechanism 1022 for the second cylinder, a moving mechanism 1040 for the second cylinder a detection portion 1030 which detects a displacement of the second cylinder 1020, and a temperature sensor 1050 which measures the temperature of the ring 104 during adjustment. The first cylinder 1010 is rotated by the drive mechanism 1012 and the second cylinder 1020 is rotated by the drive mechanism 1022. The displacement mechanism 1040 moves the second cylinder 1020 in a horizontal direction so that the spacing between the second cylinder 1020 and the first cylinder 1010 is changed. The detection portion 1030 detects the displacement of the second cylinder 1020.
    The device for adjusting the circumferential length 1000 is controlled by a control portion (not shown). The control section receives the displacement of the second cylinder 1020 from the detection section 1030, and the temperature of the ring 104 from the temperature sensor 1050. Also, the control section receives the volume of the ring 104 before adjusting the circumferential length, and the circumferential length of the ring 104 after adjustment.
    The control portion controls the displacement mechanism 1040 for the second cylinder 1020 so that the spacing between the relative positions of the first cylinder 1010 and the second cylinder 1020 becomes a predetermined value. When the first cylinder 1010 and the second cylinder 1020 are in this state, the ring 104 is wrapped around the first cylinder 1010 and the second cylinder 1020. The control portion controls the rotation of the first cylinder 1010 and the rotation of the second cylinder 1020. In addition, the control portion changes the spacing between the first cylinder 1010 and the second cylinder 1020. The control portion moves the second cylinder 1020 to a target position while the first cylinder 1010 and the second cylinder 1020 rotates. Thus, a predetermined stretching force (F) is applied to the ring 104, which makes it possible to adjust the circumferential length of the ring 104 to a target circumferential length. Then, a speed at which the second cylinder 1020 is displaced is set to a speed at which a load (load in a plastic zone) causing plastic deformation can be applied to the ring 104.
    Then, the second cylinder 1020 is moved to a position so that the circumferential length of the ring 104 is adjusted to a circumferential length that is greater than the target circumferential length with a contraction amount. Displacement of the second cylinder 1020 is stopped at this position, and thus the process of stretching the ring 104 is complete. In this process, a degree of contract quantity can be considered instead of the contract quantity. The contraction amount is a length obtained by subtracting a circumferential length L (3) from the ring 104 which is measured after the ring 104 has been removed from the device for adjusting the circumferential length 1000 of a circumferential length L (2) from the ring 104 upon adjustment by the circumferential length adjustment device 1000. The amount of the contraction amount is a value obtained by dividing the contraction amount by a circumferential length L (1) of the ring 104 before adjustment. After this, the contraction quantity will be referred to as "spring-back quantity". and the degree of contraction amount will be referred to as "recoil rate". Degree of springback is indicated by a reference sign a.
    The degree of springback ot varies according to the volume of the ring 104 before adjustment, and the temperature of the ring 104 upon adjustment. The control section stores the change in the degree of springback a in a memory. Figure 7 is a graph showing a relationship between the volume of the ring 104 before adjustment and the degree of springback a. Figure 8 is a graph showing a relationship between the temperature of the ring 104 upon adjustment and the degree of springback a. As shown in Figure 1, the control portion can calculate the amount of springback α based on the volume of the ring 104 before adjustment. As shown in Figure 8, the control portion can calculate the degree of springback α based on the temperature of the ring 104 upon adjustment. The relationship between the volume of the ring 104 and the degree of recoil ot shown in Figure 7, and the relationship between the temperature of the ring 104 and the degree of recoil α shown in Figure 8 are by way of example, and the invention is not limited to the relationships shown in Figure 7 and Figure 8.
    Referring to Figure 9, a description will be given of a control of a program for determining the circumferential length when the circumferential length of the ring 104 is adjusted, which is performed by the control portion in the circumferential length adjusting device 1000 according to the embodiment of the invention.
    In step 100, the control portion from the memory reads the circumferential length L (1) of the ring 104 before adjustment. The circumferential length L (1) of the ring 104 before adjustment is pre-stored in the memory. In step S110, the control portion reads from the memory a target circumferential length L (4) of the ring 104 which is the target circumferential length after adjustment by the circumferential length adjusting device 1000. In step S120, the control portion reads from the memory of springback ot corresponding to the ring 104 which is subjected to the process of adjusting the circumferential length. The amount of springback α according to types of metal of ring 104 and the like are stored in the memory in advance.
    In step S130, the control portion determines whether the amount of rebound α should be corrected based on the volume of the ring 104, i.e., a volume correction should be performed. This determination is made based on information input to the control section. When the volume correction of the rebound degree α is to be performed (i.e., YES in step S130), the process proceeds to step S140. If not (i.e., NO at step S130), the process proceeds to step S160.
    In step S140, the control portion calculates the volume of the ring 104 before adjustment. The volume of the ring 104 can be calculated based on the weight of the ring 104 before fitting and the density of the metal forming the ring 104, or based on the width, thickness, and circumference length of the ring 104 before fitting. In step S150, the control portion corrects the amount of springback α based on the volume calculated in step S140. Then the map shown in Figure 7 is used.
    In step SI60, the control portion determines whether the amount of rebound α should be corrected based on the temperature of the ring 104, i.e., a temperature correction should be performed. This determination is made based on information input in the control section. When the temperature correction of the degree of recoil α is to be performed (i.e., YES in step S160), the process proceeds to step S170. If not (i.e., NO at step S160), the process proceeds to step SI90.
    In step S170, the control portion detects the temperature of the ring 104 upon adjustment based on information input from the temperature sensor 1050. In step SI80, the control portion corrects the amount of recoil α based on the temperature detected in step S170. Then the card shown in Figure 8 is used.
    In step S190, the control portion calculates the circumferential length L (2) upon adjustment, using an equation L (4) + α x L (1). In step S200, the control portion increases the spacing between the first cylinder 1010 and the second cylinder 1020 based on the circumferential length L (2) upon adjustment, which was calculated in step S190. More specifically, the displacement of the second cylinder 1020 is obtained using the spacing between the first cylinder 1010 and the second cylinder 1020 which is calculated based on the circumferential length L (2) when adjusted. Then, the displacement mechanism 1040 for the second cylinder is controlled so that a difference between the displacement of the second cylinder 1020 which is detected by the detection portion 1030 and the resulting displacement becomes zero. Thus, the distance between the first cylinder 1010 and the second cylinder 1020 is adjusted.
    A description will be given of the operation of the circumferential length adjusting device according to the embodiment of the invention, which is based on the structure and flow chart described above.
    With respect to one ring 104 which is subjected to circumferential length adjustment, an operator measures the circumferential length L (1) before adaptation and causes the circumferential length L (1) to be stored in the memory. The operator also ensures that the target peripheral length L (4) which is the target peripheral length of the ring 104 is stored in the memory after adjustment. Furthermore, the operator ensures that the amount of springback α of the ring 104 is stored in the memory.
    Then, with respect to the ring 104 being subjected to circumferential length adjustment, the circumferential length L (1) before adjustment, the target circumferential length 1, (4), and the degree of resiliency α of the ring 104 are read out from the memory (steps S100, S110, S120). When volume correction is to be performed (ie YES
    in step S130), the volume of the ring 104 before adjustment is calculated (S140). The amount of springback α is corrected based on the calculated volume using the map shown in Figure 7 (S150). When the temperature correction is to be performed (i.e., YES in step S160), the temperature of the ring 104 is detected upon adjustment (S170), and the amount of recoil α is corrected based on the detected temperature using the map shown in Figure 8 (S180).
    Based on the circumferential length 1. (1) before adjustment, the target circumferential length L (4), and the corrected degree of recoil α, the circumferential length L (2) at adjustment is calculated using the equation L (4) + ax L (1) (S190). Based on the calculated circumferential length L (2) upon adjustment, the control portion controls the displacement mechanism 1040 for the second cylinder to adjust the spacing between the first cylinder 1010 and the second cylinder 1020 (S200).
    As described above, in the device for adjusting the circumferential length of an endless metal ring according to the embodiment of the invention, the circumferential length upon adaptation is calculated taking into account the rebound amount. The spring back amount varies according to the peripheral length of the metal ring before adjustment. Because the circumferential length on adaptation is calculated based on the circumferential length before adaptation, the target circumferential length and the degree of recoil, the accuracy of the circumferential length of the endless metal ring does not deteriorate even when the circumferential length of the endless metal belt before adaptation has a deviation. The amount of rebound varies according to the volume of the ring before adjustment, and the temperature of the ring upon adjustment as well. Because the amount of recoil is corrected by considering the volume of the ring before adjustment and the temperature of the ring upon adjustment, the circumferential length of the ring can be adjusted without being influenced by variation in the volume of the ring before adjustment or a change in the ring temperature upon adjustment.
    The degree of recoil may have a deviation due to a deviation of the endless metal ring composition resulting from a deviation of processing in a preparation process. In this case, with respect to about ten endless metal rings in each production lot, the circumferential length L (3) can be measured after adjustment, and the intermediate distance between the first cylinder 1010 and the second cylinder 1020 which is calculated based on the circumferential length L ( 2) adjustment is possible so that a difference between the measured circumference length L (3) and the target circumference length L (4) becomes zero. More specifically, a correction value for the degree of rebounding a, which is set such that the difference between the average of the measured circumferential lengths L (3) and the target circumferential length L (4) becomes zero, and the degree of rebounding α can be corrected using the correction value. Alternatively, a correction value for the spacing between the first cylinder 1010 and the second cylinder 1020 can be calculated, and the spacing can be corrected using the correction value. When the spacing between the first cylinder 1010 and the second cylinder 1020 is corrected by adjustment, the circumferential length of the endless metal ring can be adjusted to the target circumference length with high accuracy even when the degree of recoil has a deviation due to a deviation in composition of the endless metal ring resulting from a deviation of processing in a preparation process.
    A device for adjusting the circumferential length and a method for adjusting the circumferential length of an endless metal ring which is used for a CVT are provided. A circumferential length L (1) of a ring before adjustment, a target circumferential length L (4), and a degree of recoil are read (S100, S110, S120), the degree of recoil α is corrected based on the volume of the ring before adjustment (S150), the degree of rebound α is corrected based on the temperature of the ring when adjusted (S180), and a circumferential length L (2) when adjusted is calculated based on the circumferential length L (l) before adjustment, the target circumferential length L (4), and the corrected degree of rebound α (SI90), thereby improving the accuracy of the circumferential length.
    权利要求:
    Claims (8)
    [1]
    An apparatus for adjusting the circumferential length of an endless metal ring in which an endless metal ring (104) is wrapped around cylinders (1010, 1020), and wherein an intermediate distance between the cylinders (1010, 1020) is increased so that the endless metal ring (104) is stretched when the cylinders (1010, 1020) are rotated, whereby the endless metal ring (104) is plastically deformed and a circumferential length of the endless metal ring (104) is adjusted to a stop-flap length (L (4)), comprising: first circumferential length measuring means for measuring the circumferential length (L (1)) of the endless metal ring (104) before the circumferential length is adjusted; and adjusting means for adjusting the circumferential length of the endless metal ring (104) to the target circumferential length (L (4)) by increasing the spacing between the cylinders (1010, 1020) based on the measured circumferential length (L (1) ) so that the circumferential length (L (2)) of the endless metal ring when the circumferential length is adjusted will yield a contraction amount (L (2) -L (3)), which is due to elastic deformation of the endless metal ring (104) after the peripheral length is adjusted to be greater than the target peripheral length (L (4)), the adjusting means adjusting the peripheral length of the metal endless ring (104) to the target peripheral length (L (4)) by increasing the spacing between the cylinders ( 1010, 1020) based on a degree (a) of the contraction amount due to elastic deformation of the endless metal ring (104) after the circumferential length is adjusted relative to the circumferential length (L (1)) of the endless metal ring (104) before the circumference length is adjusted, the degree (a) of the contraction amount being obtained in advance, further comprising: volume measuring means for measuring a volume of the endless metal ring (104) before the circumferential length is adjusted; and first change means for changing the amount (a) of the contraction amount based on the measured volume.
    [2]
    Device for adjusting the circumferential length of an endless metal ring according to claim 1, characterized in that it further comprises: temperature measuring means for measuring a temperature of the endless metal ring (104) when the circumferential length is adjusted; and second changing means for changing the degree (a) of the contraction amount based on the measured temperature.
    [3]
    Device for adjusting the circumferential length of an endless metal ring according to claim 1 or 2, characterized in that it further comprises: second circumferential length measuring means for measuring the circumferential length (L (3)) of the endless metal ring (104) after the circumference length is adjusted; and third changing means for changing the amount (a) of the contraction amount based on a difference between the measured circumference length (L (3)) and the target circumference length (L {4)).
    [4]
    Apparatus for adjusting the circumferential length of an endless metal ring according to claim 1, 2 or 3, characterized in that it further comprises: second circumferential length measuring means for measuring the circumferential length of the endless metal ring (104) after the circumferential length has been adjusted ; correction means for correcting, based on a difference between the measured circumference length (L (3)) and the target circumference length (L (4)), the spacing between the cylinders (1010, 1020) when the circumference length is adjusted, the spacing being adjusted is calculated by taking into account the target circumference length (L (4)), and at least one of the contraction quantity (L <2) - L <3)) and the degree (a) of the contract quantity.
    [5]
    A method for adjusting the circumferential length of an endless metal ring in which an endless metal ring (104) is wrapped around cylinders (1010, 1020), and wherein an intermediate distance between the cylinders (1010, 1020) is increased so that the endless metal ring (104) is elongated when the cylinders (1010, 1020) are rotated, whereby the endless metal ring (104) is plastically deformed and a circumferential length of the endless metal ring (104) is adjusted to a free-frame circumference length (L {4 ), comprising the following steps of: measuring the circumferential length (L (1)) of the endless metal ring (104) before adjusting the circumferential length; and adjusting the circumferential length of the endless metal ring (104) to the target circumferential length (L (4)) by increasing the spacing between the cylinders (1010, 1020) based on the measured circumferential length (L (1)) so that the circumferential length (L (2)) of the endless metal ring (104) when the circumferential length is adjusted, a contraction amount (L (2) - (L (3)), which is due to elastic deformation of the endless metal ring (104) ) after the circumferential length is adjusted, is greater than the target circumferential length (L (4)), further comprising the step of: adjusting the circumferential length of the endless metal ring (104) to the target circumferential length (L (4)) by increasing of the spacing between the cylinders (1010, 1020) based on an amount (a) of the contraction amount due to elastic deformation of the endless metal ring (104) after the circumferential length is adjusted relative to the circumferential length (L (1)) of the endless metal ring (104) before the circumference narrow is adjusted, the amount (a) of the contraction amount being obtained in advance and further comprising the steps of: measuring a volume of the endless metal ring (104) before adjusting the circumferential length; and changing the amount (a) of the contraction amount based on the measured volume.
    [6]
    The method of adjusting the circumferential length of an endless metal ring according to claim 5, characterized in that it further comprises the steps of: measuring a temperature of the endless metal ring (104) when the circumferential length is adjusted; and changing the amount (or) of the contraction amount based on the measured temperature.
    [7]
    A method of adjusting the circumferential length of an endless metal ring according to claim 5 or 6, characterized in that it further comprises the steps of: measuring the circumferential length (L (3)) of the endless metal ring (104) after the circumference length is adjusted; and changing the amount (or) of the contraction amount based on a difference between the measured circumference length (L (3)) and the target circumference length (L (4)).
    [8]
    Method for adjusting the circumferential length of an endless metal ring according to claim 5, 6 or 7, characterized in that it further comprises the steps of: measuring the circumferential length (L (3)) of the endless metal ring (104) after the circumference length has been adjusted; and correcting based on a difference between the measured circumference length (L (3)) and the target circumference length (L (4)); of the spacing between the cylinders (1010, 1020) when the circumferential length is adjusted, the spacing being calculated by considering the target circumferential length (L (4)), and at least one of the contraction amount <L (2) -L (3)) and the degree (a) of the contraction quantity.
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    同族专利:
    公开号 | 公开日
    DE102004006284A1|2004-09-02|
    US7013691B2|2006-03-21|
    DE102004006284B4|2006-06-14|
    JP3861824B2|2006-12-27|
    NL1025354C2|2005-01-25|
    US20040159137A1|2004-08-19|
    JP2004243358A|2004-09-02|
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    法律状态:
    2004-10-01| AD1A| A request for search or an international type search has been filed|
    2004-11-01| RD2N| Patents in respect of which a decision has been taken or a report has been made (novelty report)|Effective date: 20040920 |
    2005-04-01| PD2B| A search report has been drawn up|
    2013-08-14| V1| Lapsed because of non-payment of the annual fee|Effective date: 20130801 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2003034616|2003-02-13|
    JP2003034616A|JP3861824B2|2003-02-13|2003-02-13|Peripheral length adjusting device and perimeter adjusting method of endless metal ring|
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