• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a vehicle alternator which includes: a housing (4) having an aeration port (2a, 3a) on an outer periphery; a stator (12) installed in the housing (4); a rotor (8) supported in the stator (2) with rotational capability; a fan (11) installed opposite the ventilation opening (2a, 3a) in the housing (4) and rotated integrally with the rotor (8); and a protuberance (72, 73) formed on a surface of the housing (4) opposite a nozzle (11a, 11c) of the fan (11) at a position adjacent an outer periphery of the vent (2a, 3a). ) of the housing (4).
    公开号:FR3013530A1
    申请号:FR1454980
    申请日:2014-06-02
    公开日:2015-05-22
    发明作者:Masao Akiyoshi；Kazuya Hasegawa；Atsushi Ohashi；Kazunori Tanaka
    申请人:Mitsubishi Electric Corp；
    IPC主号:
    专利说明:

    [0001] BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an alternator, and more particularly, to a vehicle alternator that charges a battery in the vehicle and powers an electrical device in the vehicle.
    [0002] Description of Related Art In a related art vehicle alternator, as described in International Publication No. WO 2008-037294, a suction port of a fan supplied to a support has a circular section. A diameter of the suction port decreases smoothly towards the fan and then gradually increases to a position adjacent to the fan in the most immediate vicinity. In the vehicle alternator of the related art, however, since the diameter of the suction port is progressively increasing towards the fan, a range in which a momentum is given to the cooling air by the fan is reduced as is so a quantity of pressure rise by the fan. Accordingly, even when a pressure drop at one exhaust outlet side of the blower is reduced by providing space at the blower end, the vehicle alternator in the related art has the problem that an increase in air volume of the cooling air decreases in a case where there is a certain amount of pressure loss in an air passage upstream of the fan. In addition, a pressure of air flow flowing out of the fan is high while a pressure is low in the vicinity of the suction port of the fan. From there, a leakage current of the cooling air is generated in a space in the vicinity of the fan tip from the fan downstream to the fan suction port. However, because the structure is such that the suction port of the fan gradually extends to the position adjacent the fan in the most immediate vicinity, a resistance to the leakage current of the cooling air is so low that a flow rate of the leakage current of the cooling air increases rapidly. Since a working amount by the fan is constant, a volume of air of the exhausted cooling air decreases when there is a considerable leakage current of the cooling air. As has been described, the vehicle alternator in the related art described in patent document 1 (International Publication No. WO 2008/037294) has the problem that a temperature of a component that needs to be cooled by the air flow generated by the fan rises due to a decrease in the air volume of the cooling air. SUMMARY OF THE INVENTION The invention has been envisaged to solve the problems of the alternator in the related art mentioned above, and aims to accentuate a cooling effect on a stator winding and rectifier elements. by reducing a pressure loss in an air passage of an air flow generated by a fan of a vehicle alternator and also increasing a volume of air of the cooling air.
    [0003] An alternator according to one aspect of the invention includes: a housing having an aeration port on an outer periphery; a stator installed in the housing; a rotor supported in the stator with rotational capability; a fan installed opposite the vent in the housing and rotated integrally with the rotor; and a protuberance formed on a surface of the housing opposite a fan tip at a position adjacent an outer periphery of the housing vent.
    [0004] Advantageously, an end portion of the protuberance on one side of the fan is parallel to an axial direction of the rotor and close to the fan; and the protuberance is inclined relative to the end portion on the fan side toward a radial direction so as to move away from the fan. Advantageously, the protuberance has a triangular section. Advantageously, an end portion of the protuberance on one side of the fan is parallel to an axial direction of the rotor and, from the end portion to a radial direction, the protuberance comprises a portion parallel to a tip of the fan and a portion tilted away from the fan.
    [0005] Advantageously, the protuberance has a trapezoidal section. Advantageously the protuberance has a rectangular section and a surface parallel to a side surface of the ventilation opening.
    [0006] Advantageously the fan comprises a main fan body and multiple vanes provided to the main fan body; and each of the plurality of blades has a portion having a maximum blade height somewhere between an inner periphery and an outer periphery of the fan main body and the blade has a constant height of the portion at the outer periphery. Advantageously the housing has multiple ventilation holes; and a diameter of an outer periphery of the crankcase vents is larger than a diameter of a fan periphery, which forms the portion having the maximum blade height. Advantageously, the casing is a rear support and the diameter of the outer periphery of the aeration apertures of the rear support is smaller than a diameter of an external periphery of the ventilator. Advantageously, the casing is a front support and the diameter of the outer periphery of the ventilation apertures of the front support is greater than a diameter of an outer periphery of the ventilator.
    [0007] According to the alternator configures as above, providing the protuberance on a surface of the housing opposite the end of the fan at a position adjacent the outer periphery of the ventilation port of the housing, an area of a passage of Air cooling air can be increased and, therefore, a volume of air generated by the fan can be increased. It thus becomes possible to accentuate a cooling effect on a stator winding and rectifier elements in the alternator. The foregoing and other objects, features, aspects, and advantages of the present invention will be apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a vehicle alternator according to a first embodiment of the invention; Fig. 2 is a rear end view showing an unlatched state of a protective cover of the vehicle alternator according to the first embodiment of the invention; Figure 3 is a perspective view of a fan of the vehicle alternator according to the first embodiment of the invention; Figure 4 is a perspective view of a rear support of the alternator according to the first embodiment of the invention; Figure 5 is a sectional view of a major portion in an alternator according to a second embodiment of the invention; and FIG. 6 is a sectional view of a major portion in an alternator according to a third embodiment of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a sectional view of a vehicle alternator according to a first embodiment of the invention. Fig. 2 is a rear end view showing a detached protective cover state of the vehicle alternator according to the first embodiment of the invention. Hereinafter, a configuration and operation of the alternator of the first embodiment is described in detail with reference to the drawings. Referring to Fig. 1 and Fig. 2, the vehicle alternator 1 includes a housing 4 formed of a front support 2 and a rear support 3 both being cup-shaped and made of aluminum. The alternator 1 also includes a shaft 6 supported on the housing 4 rotatably via a pair of bearings 5, a pulley 7 firmly attached to the shaft 6 at one end extending forwardly relative to the housing 4, and a rotor 8 attached to the shaft 6 and installed in the housing 4. The alternator 1 further includes fans 11 attached to the rotor 8 on both end faces in an axial direction 6a, a stator 12 attached to the casing 4 so as to surround the rotor 8, a pair of slip rings 15 fixed to the shaft 6 in an extension portion extending rearwardly relative to the casing 4 and supplying the rotor 8 with current, a pair of brushes 16 sliding on surfaces of the respective slip rings 15, and a brush holder 17 in which to store the brushes 16. The alternator 1 further includes a voltage regulator 22 installed on the rear side of the rear support 3 and regulating the amplitude of an alternating voltage ge located at the stator 12, a connector 24 installed on the rear side of the rear support 3, through which signals are supplied at the input and at the output between the voltage regulator 22 or the like and an external device (not shown), a rectifier device 28 installed on the rear side of the rear support 3 and rectifying an alternating voltage generated at the stator 12 in a DC voltage, and a protective cover 50 attached to the rear support 3 so as to cover the brush holder 17, the voltage regulator 22 and the rectifier device 28. The rotor 8 is a Lundell type rotor and includes a field winding 9 generating a flux when an excitation current passes through it and a polar core 10 provided with to cover the field winding 9 and on which magnetic poles are generated by the flux. The stator 12 includes a cylindrical stator core 13 and a stator winding 14 wound around the stator core 13 and generating an alternating current with a variance of flux from the field winding 9 in conjunction with rotations of the rotor 8 In addition, the stator 12 is installed so as to surround the rotor 8 while the stator core 13 is pinched at the opening ends of the front support 2 and the rear support 3 from both sides in the axial direction. . The rectifier device 28 includes a positive electrode side heat sink 29 on which multiple positive electrode side rectifier elements 30 are mounted, a negative electrode side heat sink 31 on which multiple negative electrode side rectifier elements 32 are mounted, and a circuit board 33. The circuit board 33 is sandwiched between the positive electrode side heat sink 29 and the negative electrode side heat sink 31 substantially in the form of a capital C. The circuit board 33 is molded from an insulating resin, such as PBT. The positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32 are connected to form a predetermined bridge circuit via an insert-molded electrical conductor in the circuit board 33. The vehicle alternator 1. The vehicle alternator 1 operates as a three-phase alternator 30 with 12 magnetic poles and 36 slots. It should be appreciated, however, that the number of magnetic poles and slots are not limited to those specified above. In the vehicle alternator 1, a flow is generated when a current is supplied from a battery (not shown) to the field winding 9 of the rotor 8 via the brushes 16 and the slip rings 15. With this flow, N-poles and S-poles are generated on an outer peripheral surface of the polar core 10 alternately in a circumferential direction.
    [0008] On the other hand, the rotor 8 is rotated when a rotational torque of the motor is transmitted from an output shaft of the motor to the shaft 6 via a belt and the pulley 7. From there, a rotational field is given to the stator winding 14 of the stator 12 and an electromotive force is generated at the stator winding 14. An alternating current generated by this electromotive force is rectified by the stator device 28 and charged into the battery or supplied to an electric charge.
    [0009] The fans 11 rotate in association with rotations of the rotor 8. On the front side, cooling air is sucked into the front support 2 from the front inlet port 2a and flows in the axial direction towards the vicinity. of the rotor 8.
    [0010] Then, the cooling air is curved in a centrifugal direction by the fan 11 in the vicinity of the rotor 8 and discharged from a front-end outlet 2b. On the rear side, the cooling air is drawn into the protective cover 50 from multiple outlet ports 53 provided to the protective cover 50 and flows to the rear support 3 passing through spaces among the cooling fins. radiation supplied to the positive electrode side heat sink 29 and to the negative electrode side heat sink 31. Subsequently, the cooling air is drawn into the rear support 3 from a rear side inlet port 3a and flows in the axial direction 6a. to the vicinity of the rotor 8. Next, the cooling air is curved in the centrifugal direction by the fan 11 in the vicinity of the rotor 8 and is discharged from a rearward outlet port 3b. A portion of the heat generated at the stator 12 is released from a coil end 12a by the cooling air flowing out of the fans 11 and directed to the front side outlet port 2b and the outlet port rear side 3b. In addition, another portion of the heat at the stator 12 is transmitted to the front support 2 and the rear support 3 and released to the cooling air from multiple front ribs 51 of the front side outlet port 2b and rear side ribs 52, so that the stator 12 is cooled. In addition, the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32 are cooled by the cooling air flowing through spaces of the radiation fins supplied to the positive electrode side heat sink 29 and to the negative electrode side heat sink 31.
    [0011] We now describe a structure and an operation on the periphery of the rear support 3 and the fan 11. There is a clearance 60 between a tip 11a of the rotary fan 11 and the stationary rear support 3. Here, a pressure is low on the side of the shaft 6 of the fan 11 and a pressure is high on the side of the rear support outlet port 3b. A leakage current is therefore generated in the deflection 60 of the rear-side outlet orifice 3b towards the shaft 6. When a quantity of the leakage current increases, an amount of air cooling the stator 12, the rectifier elements positive electrode side 30 and the negative electrode side rectifier elements 32 decreases. As a result, stator temperatures 12, positive electrode side rectifier elements 30 and negative electrode side rectifier elements 32 rise and an amount of power generation of the alternator 1 decreases.
    [0012] In order to reduce a quantity of the leakage current in the deflection 60, the rear support 3 and the nozzle 11a of the fan 11 are opposed in parallel with each other so that the deflection 60 is reduced to a minimum. This configuration can reduce a quantity of the leakage current. Nevertheless, this configuration presents the problem that a high pressure side and a low pressure side are formed on a blade surface of the rotary fan 11, and pressures on these sides propagate towards the rear support 3 and give rise to a fluctuation. pressure on the surface of the rear support 3, which leads to significant noise. On the other hand, in the typical vehicle alternator 1, a lead wire 14a is connected from the coil end 12a of the stator 12 to the rectifier side, and the presence of the lead wire 14a reduces an area of a lead-through. air flowing out of the blower 11. The tip of the coil end 12a also reduces the area of the air passage flowing out of the blower 11 in some cases due to its location closer to the endpiece 11a of the fan 11 in the axial direction 6a that of a bottom surface 11b of the fan 11. When the area of the air passage flowing out of the fan 11 is reduced, an amount of air to cool the stator 12 the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32 are decreased. As a result, stator temperatures 12, positive electrode side rectifier elements 30 and negative electrode side rectifier elements 32 rise and an amount of power generation of the vehicle alternator 1 decreases. A structure is now described on the periphery of the rear support 3 and the fan 11 according to the first embodiment of the invention. Figure 3 is a perspective view of a fan of the vehicle alternator according to the first embodiment of the invention. Referring to Figure 3, the fan 11 includes a fan main body 83 and multiple blades 84 provided to the fan main body 83. Each of the plurality of blades 84 includes a portion 81 having a blade height. at least between an inner periphery 80 and an outer periphery 82 of the fan main body 83. The blade 84 also has a constant height of the portion 81 having the maximum blade height at the outer periphery 82. FIG. a perspective view of the rear support of the vehicle alternator according to the first embodiment of the invention. The rear support 3 includes multiple intake ports 3a to allow the cooling air to enter. In addition, the rear support 3 includes outlet orifices 3b partitioned by the ribs 52. A diameter 85 of the outer periphery of the multiple inlet orifices 3a of the rear support 3 is formed to be smaller than a diameter of the periphery. In addition, the blade height of the fan 11 at a position in a radial direction 6b from the outer periphery of the inlet ports 3a to the portion 81 having the maximum blade height. The diameter 85 of the outer periphery of the inlet ports 3a of the rear support 3 is formed to be larger than a diameter of a periphery of the fan 11, which forms the portion 81 having the maximum blade height. Referring again to FIG. 1, in addition to the configuration described above, the alternator 1 of the first embodiment includes a protuberance 72 on a surface of the rear support 3 opposed to the fan tip 11a. in a position adjacent to the outer periphery of the inlet openings 3a of the rear support 3. An end portion 70 of the rear support 3 5 on the side of the fan 11 is parallel to the axial direction 6a of the shaft 6 and to the most immediate vicinity of the fan 11. The protuberance 72 tilts with respect to the end portion 70 toward the radial direction 6b so as to move away from the fan 11. Due to the above configuration, the protrusion 72 having a rectangular triangle-shaped section is formed on the surface of the rear support 3 opposite the nozzle 11a of the fan 11 at a position adjacent to the outer periphery of the inlet ports 3a of the rear support. 3. By configuring in this way, a distance between the tip 11a on the outer periphery of the fan 11 and the rear support 3 can be increased and hence the area of the outlet ports 3b can be increased. As a result, the area of the cooling air air passage blocked by the lead wire 14a and the coil end 12a can be increased. From there, a pressure loss is reduced and a volume of air generated by the fan 11 is increased. It thus becomes possible to lower temperatures of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32. In addition, a momentum is given to the cooling air by the fan 11 when it is flows from the large diameter of the inlet ports 3a to the large diameter of the fan 11 and results in a rise in pressure. By aligning the outer side surface (outer peripheral side surface) of the inlet ports 3a parallel to the axial direction 6a, a distance between the large diameter of the inlet ports 3a and the large diameter of the fan 11 can be increased and the pressure can be mounted accordingly. From there, even in a case where there is a great loss of pressure at the heat sink due to the cooling of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32, the pressure can be mounted by the It is thus possible to lower the temperatures of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32. In addition, by configuring such that in this embodiment, the tip 11a of the fan 11 20 and the rear support 3 are in the immediate vicinity of each other near the end portion 70 while a distance between the nozzle 11a and the rear support 3 increases towards the outer periphery of the fan 11, a fluctuation of the pressure on the surface of the rear support 3, which is the source of noise, can be reduced. It thus becomes possible to increase an air volume of the cooling air by removing a quantity of the leakage current without increasing the noise. There is described a structure on the periphery of the front support 2 and the fan 11 of the first embodiment. Although the lead wire 14a is absent on the front side, there is the output end 12a which reduces an area of the exhaust port of the fan. Component bodies such as to reduce the area of the fan outlet are smaller in number on the front side than on the back side. It should be noted, however, that cooling performance may be enhanced by a structure that increases the area of the fan outlet on the front side in the same manner as on the rear side. The structure of the fan 11 on the front side is the same as the structure of the fan on the rear side shown in Figure 3. Here, the description of the fan structure shown in Figure 3 is not repeated. It can be appreciated that the multiple blades (blades) 84 of the fan 11 can have a constant blade height of the inner periphery 80 at the outer periphery 82 of the fan 11. A diameter of the outer periphery of the inlet ports 2a of the support before 2 is formed to be smaller than the diameter of the outer periphery of the fan 11. A blade height of the fan 11 at a position in the radial direction 6b of the outer periphery of the inlet ports 2a has a portion having the maximum blade height. Referring again to FIG. 1, the outer peripheral surface of the inlet ports 2a of the front support 2 is parallel to the axial direction 6a of the shaft 6. From there, an end portion 71 of the orifices 2a in the outer peripheral surface on the side of the fan 11 is in the most immediate vicinity of the fan 11. The protuberance 73 inclines gradually with respect to the end portion 71 towards the radial direction 6b so as to away from the fan 11. Due to the above configuration, a protuberance 73 is formed on a surface of the front support 2 opposed to a tip 11c of the fan 11 at a position adjacent to the inlet ports 2a on the periphery of the support before 2. The protuberance 73 has a section in the form of a right triangle.
    [0013] When configured in this manner, a distance between the tip 11c on the outer periphery of the fan 11 and the front support 2 can be increased and from there the area of the outlet ports 2b can be increased.
    [0014] As a result, the area of the air passage of the cooling air blocked by the coil end 12a can be increased. From there, a pressure loss is reduced and a volume of air generated by the fan 11 is increased. It thus becomes possible to lower the temperatures of the bearings 5 and the stator 12. In addition, a momentum is given to the cooling air by the fan 11 when it flows from a large diameter of the intake orifices. 2a to the large diameter of the fan 11 and this results in a rise in pressure. By aligning the outer side surface of the inlet ports 2a parallel to the axial direction 6a, a distance between the large diameter of the inlet ports 2a and the large diameter of the fan 11 is increased and a pressure can be mounted accordingly. Therefore, even in a case where the tip of the coil end 12a extends in the axial direction 6a and is positioned flush with the fan tip 11c or when the area of the intake ports 2a is reduced due to multiple ribs provided to the inlet ports 2a, a pressure can be mounted by the fan 11. It thus becomes possible to lower the temperatures of the bearings 5 and the stator 12.
    [0015] The tip 11c of the fan 11 and the rear support 2 are in the immediate vicinity of each other near the end portion 71 while a distance between the tip 11c and the front support 2 increases towards the external periphery of the fan 11.
    [0016] Due to this configuration, a fluctuation of the pressure on the surface of the front support 2, which is the source of noise, can be reduced. It thus becomes possible to increase an air volume of the cooling air by removing a quantity of the leakage current without increasing noise. Second Embodiment FIG. 5 is a sectional view of a major portion in an alternator of a second embodiment. The reference numerals of FIG. 5 identical to those of the first embodiment above designate the equivalents of the first embodiment above and a description is omitted. In addition, an arrow indicates an air flow from the intake ports 3a to the outlet ports 3b.
    [0017] On the back side, in a case where there is a great loss of pressure at the heat sink due to the cooling of the positive electrode side rectifier elements 30 and negative electrode side rectifier elements 32, a pressure generated by the fan is increased, and it is the same for a pressure difference between the proximity of the center and the proximity of the outlet of the fan. When a pressure difference is increased, a leakage current of the outlet ports 3b to the intake ports 3a of the rear support 3 near the deflection 60 is increased and hence a volume of air from the air cooling is reduced in some cases. Here, a description is given of a structure on the periphery of the fan 11 in a case where a pressure generated by the fan is large with reference to FIG. 5. The fan 11 includes a fan main body 83 and multiple blades ( blades) 84 supplied to the fan main body 83. Each of the plurality of blades 84 has a portion 81 having a maximum blade height somewhere between an inner periphery 80 and an outer periphery 82 of the fan main body 83. Also, blade 84 has a constant height of the portion 81 having the maximum blade height at the outer periphery 82.
    [0018] The rear support 3 includes multiple intake ports 3a to allow the cooling air to enter. In addition, the rear support 3 includes outlet orifices 3b partitioned by ribs 52. A diameter of an outer periphery of the inlet orifices 3a of the rear support 3 is formed to be smaller than a diameter of a periphery. In addition, the blade height of the fan 11 at a position in a radial direction 6b from the outer periphery of the inlet ports 3a to the portion 81 having the maximum blade height. An outer peripheral surface of the inlet ports 3a of the rear support 3 is parallel to the axial direction 6a of the shaft 6. From there, an end portion 70 of the inlet ports 3a in the outer peripheral surface on the the side of the fan 11 is in the most immediate vicinity of the fan 11. From the end portion 70 to the radial direction 6b, the protrusion 72 has a portion parallel to the tip 11a of the fan 11 and a portion inclined so as to away from the fan 11. When configured in this manner, a protuberance 72 having a trapezoidal section is formed on the outer periphery of the rear support 3 adjacent the intake ports 3a. In the first embodiment above, the deflection 60 reaches the minimum near the end 70 of the rear support 3 while the deflection 60 increases towards the radial direction 6b.
    [0019] In the second embodiment, the deflection 60 is constant from the end portion 70 of the rear support 3 to the radial direction 6b and the displacement 60 begins to increase by one position within the diameter of the outer periphery of the fan. 11. A range in which the deflection 60 is at a minimum is extended in the radial direction 6b compared to the first embodiment above. From there, resistance is increased against a current flowing countercurrently from a high pressure region at the outlet of the fan 11 to a region of low pressure at the inlet ports 3a of the rear support. 3 15 by passing the deflection 60. A flow against the current can be deleted. As a result, an air volume of the cooling air is increased and it becomes possible to lower the temperatures of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32. When configured in this way, a distance between the tip 11a on the outer periphery of the fan 11 and the rear support 3 can be increased. As a result, a length of the outlets 3b of the rear support 3 in the axial direction 6a is extended and hence an area of the outlets 3b can be increased. As a result, an area of the cooling air air passage blocked by the lead wire 14a and the coil end 12a can be increased. From there, a loss of pressure is reduced and a volume of air generated by the fan 11 is increased. It thus becomes possible to lower the temperatures of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32. In addition, a momentum is given to the cooling air by the fan 11 while flows from the outer periphery of the inlet ports 3a to the outer periphery of the fan 11 and a pressure rises accordingly. By aligning the outer side surface of the intake ports 3a parallel to the axial direction 6a, a distance between the diameter of the outer periphery of the inlet ports 3a and the large diameter of the fan 11 can be increased and the pressure can be raised. Consequently. Therefore, even if there is a large pressure loss at the heat sink due to the cooling of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32, a pressure can be mounted by the fan 11. It thus becomes possible to lower the temperatures of the positive electrode side rectifier elements 30 and the negative electrode side rectifier elements 32. In the second embodiment, the fan end piece 11a and the inlet ports 3a of the rear support 3 are in the immediate vicinity of each other near the end portion 70 while a distance between the tip 11a and the rear support 3 increases towards the outer periphery of the fan 11. Due to this configuration , a fluctuation of the pressure on the surface of the rear support 3, which is the source of noise, can be reduced. It thus becomes possible to increase an air volume of the cooling air by removing a quantity of the leakage current without increasing the noise. The above has described a shape of the rearward inlet ports 3a on the side of the fan 11 such that the protuberance 72 having a trapezoidal section is formed on the outer periphery of the inlet ports 3a. It should be appreciated, however, that the same advantages can be obtained even when the section is rectangular in shape. Third Embodiment FIG. 6 is a sectional view of a major portion of an alternator according to a third embodiment of the invention. The numerical references identical to those of the first embodiment above designate the equivalents of the first embodiment above and a description is omitted. In addition, an arrow indicates a flow of air from the inlet ports 2a to the outlet ports 2b. The second embodiment above has described a case where high pressure is required on the back side. On the other hand, fins (not shown) are provided on the front side to increase the mechanical strength of the inlet ports 2a and outlet ports 2b and also to release the heat. When the number of fins is small and the fins are short, pressure is not required on the front side as compared to the rear side. We now describe a structure to increase the cooling air on the front side with reference to Figure 6. In a case where a pressure is not required, no pressure difference is generated between the proximity of the center and the exhaust port of the fan. From there, there is virtually no leakage current from the outlet port to the proximity of the fan center. Therefore, there is no need to provide a difference as a relationship between the diameter of the outer periphery of the intake ports and the diameter of the outer periphery of the fan as described in the first embodiment above . Each of the plurality of blades 84 of the fan 11 has a portion 81 having a maximum blade height somewhere between an inner periphery 80 and an outer periphery 82 of the fan main body 83. In addition, the blade 84 has a constant height of the portion 81 having the maximum height at the outer periphery 82. In addition, in the third embodiment, as shown in Figure 6, a diameter of the outer periphery of the inlet ports 2a of the front support 2 is formed to be larger than a diameter of the outer periphery of the fan 11. An outer peripheral surface of the inlet ports 2a of the front support 2 is parallel to the axial direction 6a of the shaft 6. Accordingly, a portion of the end 71 of the intake ports 2a in the outer peripheral surface on the side of the fan 11 is in the most immediate vicinity of the fan 11. From the end portion 71 to the radial direction 6b, the protrusion 73 has a portion parallel to the tip 11c of the fan 11 and a portion inclined to move away from the fan 11. When configured as above, a protrusion 73 having a trapezoidal section is formed on the outer periphery of the front support 2 adjacent the intake ports 2a of the front support 2 on the side of the fan 11. Due to this configuration, an area of the outlets 2b can be increased and it also becomes difficult for the cooling air flowing out of the fan 11 to flow to the inlet ports 2a. As a result, an air volume of the cooling air is increased and it becomes possible to lower the temperatures of the bearings 5 and the stator 12. The third embodiment has described the protuberance 73 having a trapezoidal section. However, it should be appreciated that the same advantages can be obtained even when the protuberance 73 has a triangular section. It should be understood that the respective embodiments of the invention may be unrestrictedly combined and modified and omitted where necessary within the scope of the invention.
    [0020] Various modifications and arrangements of the present invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention, and it should be understood that this scope is not limited to illustrative embodiments disclosed right here.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Alternator, characterized in that it comprises: a casing (4) having a ventilation opening (2a, 3a) on an outer periphery; a stator (12) installed in the housing (4); a rotor (8) supported in the stator (2) with rotational capability; a fan (11) installed opposite the ventilation opening (2a, 3a) in the housing (4) and rotated integrally with the rotor (8); and a protuberance (72, 73) formed on a surface of the housing (4) opposite a nozzle (11a, 11c) of the fan (11) at a position adjacent an outer periphery of the vent (2a, 3a). ) of the housing (4).
    [0002]
    An alternator according to claim 1, wherein: an end portion (70, 71) of the protuberance (72, 73) on one side of the fan is parallel to an axial direction (6a) of the rotor (8) and near the fan (11); and the protuberance (72, 73) is inclined with respect to the end portion (70, 71) on the fan side towards a radial direction so as to move away from the fan (11).
    [0003]
    An alternator according to claim 2, wherein: the protuberance (72, 73) has a triangular section.
    [0004]
    An alternator according to claim 1, wherein: an end portion (70, 71) of the protuberance (72, 73) on one side of the fan is parallel to an axial direction (6a) of the rotor (8) and, from the end portion to a radial direction, the protuberance (72, 73) has a portion parallel to a tip (11a, 11c) of the fan and a portion inclined to move away from the fan (11).
    [0005]
    An alternator according to claim 4, wherein: the protuberance (72, 73) has a trapezoidal section.
    [0006]
    The alternator of claim 1, wherein: the protuberance (72, 73) has a rectangular section and a surface parallel to a side surface of the vent (2a, 3a).
    [0007]
    The alternator of any one of claims 1 to 6, wherein: the fan (11) comprises a fan main body (83) and multiple vanes (84) provided to the fan main body (83); and each of the plurality of blades (84) has a portion (81) having a maximum blade height (84) somewhere between an inner periphery (80) and an outer periphery (82) of the main body (83) and the blade (84) has a constant height of the portion (81) at the outer periphery (82).
    [0008]
    An alternator according to claim 7, wherein: the housing (4) has multiple vent holes (2a, 3a); and a diameter (85) of an outer periphery of the ventilation apertures (2a, 3a) of the housing (4) is larger than a diameter of a periphery of the fan, which forms the portion (81) having the maximum height of the blades.
    [0009]
    An alternator according to claim 8, wherein: the housing (4) is a rear support (3) and the diameter (85) of the outer periphery of the ventilation apertures (3a) of the rear support (3) is larger small than a diameter of an outer periphery (82) of the fan (11).
    [0010]
    An alternator according to claim 8, wherein: the housing (4) is a front support (2) and the diameter of the outer periphery of the ventilation apertures (2a) of the front support (2) is larger than a diameter of an outer periphery of the fan (11).
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    同族专利:
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    JP2015104142A|2015-06-04|
    US9413207B2|2016-08-09|
    CN104659964B|2018-02-13|
    US20150137633A1|2015-05-21|
    JP5832507B2|2015-12-16|
    FR3013530B1|2020-01-31|
    CN104659964A|2015-05-27|
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    FR3083032B1|2018-06-26|2022-01-21|Valeo Equip Electr Moteur|ROTATING ELECTRIC MACHINE HOUSING|
    法律状态:
    2016-07-08| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-30| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-09| PLSC| Publication of the preliminary search report|Effective date: 20180309 |
    2018-06-27| PLFP| Fee payment|Year of fee payment: 5 |
    2019-06-28| PLFP| Fee payment|Year of fee payment: 6 |
    2020-05-12| PLFP| Fee payment|Year of fee payment: 7 |
    2021-05-13| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2013240533A|JP5832507B2|2013-11-21|2013-11-21|AC generator|
    JP2013240533|2013-11-21|
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