JP4475215B2 - Vehicle alternator - Google Patents

Description

  The present invention relates to a vehicle AC generator mounted on a passenger car, a truck, or the like.

A vehicular AC generator includes a rectifier that rectifies an AC voltage induced in a stator winding. Recently, with the increase in in-vehicle electronic devices and the like, the vehicle alternator tends to have a higher output, and the temperature of the rectifier from which the output current is extracted is rising. For this reason, the device which lowers the temperature of a rectifier is made. For example, a vehicular AC generator that reduces the temperature of the rectifier by increasing the surface area by changing the radiating fin of the rectifier from a simple flat plate shape to a complicated shape with a plurality of sub fins formed on the surface is known. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2004-147486 (page 11-14, FIG. 1-15)

  By the way, the radiating fin of the rectifying device provided in the vehicle alternator disclosed in Patent Document 1 has a complicated shape in which the sub fin is formed, and thus, for example, it is manufactured by die casting or post-processing such as cutting is required. Therefore, there is a problem that the manufacturing is not easy and the manufacturing cost increases.

  The present invention has been created in view of the above points, and an object of the present invention is to improve the cooling performance of the rectifying device, facilitate manufacture, and suppress an increase in cost. The purpose is to provide an alternator.

In order to solve the above-described problems, an AC generator for a vehicle according to the present invention includes a cooling fan that rotates in conjunction with a rotor, a stator having a stator winding, and an alternating current generated by the stator winding. A rectifier that rectifies the electromotive force into direct current, and the rectifier includes a plurality of rectifier elements, a first heat radiation fin made of metal into which the rectifier elements are press-fitted into the attachment holes, and the rectifier elements and the attachment holes. A second radiating fin partly sandwiched between, a part of the second radiating fin is disposed between the rectifying element and the mounting hole, and the remaining part is from the surface of the first radiating fin. The protruding portion is disposed in the middle of the ventilation path of the cooling air that is introduced from the outside of the protective cover that covers the rectifier and flows along the surface of the first radiating fin . By adding the second radiating fin, the entire radiating area combined with the first radiating fin can be expanded, so that the cooling performance can be improved. Moreover, since it is not necessary to make a shape complicated especially about the 1st radiation fin, it is possible to manufacture it by pressing a board | plate material, and about the added 2nd radiation fin to a 1st radiation fin. Since the rectifying element is simply clamped when it is press-fitted into the provided mounting hole, a separate process such as welding is not required, manufacturing is easy, and an increase in cost can be suppressed.

In addition, the second radiating fin can be efficiently cooled by the cooling air flowing along the surface of the first radiating fin.

  In addition, it is desirable that the second radiating fin described above is disposed at a position where the remaining portion is substantially parallel to and spaced apart from the surface of the first radiating fin. Thereby, since the height of the 2nd radiation fin which protruded from the surface of the 1st radiation fin can be suppressed, the height of the direction perpendicular to the surface of the 1st radiation fin can be made low. In addition, since the cooling air flows between the first and second radiating fins in the parallel portion, the radiating effect of these radiating fins can be further enhanced.

  Moreover, as for the 2nd radiation fin mentioned above, it is desirable for the remaining part to protrude to the one surface side of the 1st radiation fin. By projecting the second radiating fin only on one surface side of the first radiating fin, it is possible to insert and assemble the second radiating fin from the projecting side, and manufacture the rectifier. Easy to do.

  Further, the mounting hole described above is a through hole provided in the first radiating fin, and it is desirable that the remaining portion of the second radiating fin protrudes on both surfaces of the first radiating fin. Thereby, the whole heat radiation area combining the first and second heat radiation fins can be further expanded, and the cooling performance can be further improved.

  In addition, it is desirable that the above-described second radiating fin is clamped and fixed between the rectifying element and the mounting hole by press-fitting the rectifying element into the mounting hole. Thereby, when attaching a rectifier to a 1st radiation fin, it becomes possible to fix a 2nd radiation fin simultaneously, and can simplify a manufacturing process.

  Hereinafter, an AC generator for a vehicle according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an AC generator for a vehicle according to an embodiment. As shown in FIG. 1, the vehicle alternator 1 of this embodiment includes a rotor 2 that is driven to rotate from an engine via a belt (not shown) and a pulley 10, and a stator winding 41. AC electromotive force generated by a stator 4 that functions as an armature, a front frame 3a and a rear frame 3b that support the rotor 2 and the stator 4 via a pair of bearings 3c and 3d, and a stator winding 41 A rectifier 5 that rectifies the current to DC, a brush device 7 that holds a brush that supplies a field current to the field coil 22 of the rotor 2, a regulator 9 that controls the output voltage, a rectifier 5 and a regulator 9 A protective cover 8 attached to the end face of the rear frame 3b so as to cover the brush device 7 and the like is included. The rotor 2 includes a cooling fan 26 as a cooling air generating device that sucks cooling air from the outside via the rectifying device 5 on the axial end face of the rotor magnetic pole 24. The cooling fan 26 rotates in conjunction with the rotor 2.

  Next, details of the rectifier 5 will be described. FIG. 2 is a partial cross-sectional view of the vehicular AC generator 1 showing a cross-sectional structure of the rectifier 5. The rectifying device 5 includes a metal positive-side radiating fin 501 and a negative-side radiating fin 503 that are stacked in two stages in the axial direction, a positive-side rectifying element 502 and a positive-side cooling plate 505 attached to the positive-side radiating fin 501. And a negative electrode side rectifying element 504 and a negative electrode side cooling plate 506 attached to the negative electrode side heat radiation fin 503, and a terminal block 513. The positive side radiating fin 501 and the negative side radiating fin 503 correspond to the first radiating fin, and the positive side cooling plate 505 and the negative side cooling plate 506 correspond to the second radiating fin, respectively. Further, the number of the positive side rectifying element 502, the positive side cooling plate 505, the negative side rectifying element 504, and the negative side cooling plate 506 corresponds to the number of phases of the stator windings 41. Since the stator winding 41 is used, there are provided three that are the same as the number of phases or six that are multiples thereof.

  The terminal block 513 is a resin insulating member that electrically insulates between the positive-side radiating fin 501 and the negative-side radiating fin 503, and the AC voltage generated in the stator 4 is supplied to the positive-side rectifying element 502 and the negative-side rectifying element. A conductive member 514 for guiding to 504 is incorporated. The positive-side rectifying element 502 is arranged so that the lead part 510 faces the negative-side radiating fin 503, and the negative-side rectifying element 504 is arranged so that the lead part 512 faces the positive-side radiating fin 501.

  The positive-side rectifying element 502 is fixed by being press-fitted together with the positive-side cooling plate 505 into a mounting hole as a through hole formed in the positive-side radiating fin 501, and the lead portion 510 is a conductive member of the terminal block 513. 514 is electrically connected. Similarly, the negative electrode side rectifying element 504 is fixed by being press-fitted together with the negative electrode side cooling plate 506 into a mounting hole as a through hole formed in the negative electrode side heat radiation fin 503, and the lead portion 512 is fixed to the terminal block 513. The conductive member 514 is electrically connected. The positive-side radiating fin 501 is formed, for example, by pressing an aluminum plate material, and also serves as a terminal for electrically connecting a plurality of positive-side rectifying elements 502 to each other. Similarly, the negative-side radiating fin 503 is formed, for example, by pressing an aluminum plate material, and also serves as a terminal for electrically connecting a plurality of negative-side rectifying elements 504 to each other. As described above, the conductive member 514 of the terminal block 513, the positive-side radiating fins 501 and the negative-side radiating fins 503 form a three-phase full-wave rectifier circuit including a plurality of positive-side rectifying elements 502 and a plurality of negative-side rectifying elements 504. .

  The positive-side cooling plate 505 is made of metal, a part thereof is disposed between the positive-side rectifying element 502 and the mounting holes of the positive-side radiating fins 501, and the remaining part protrudes from the surface of the positive-side radiating fins 501. . Specifically, as shown in a cross-sectional shape in FIG. 2, the positive-side cooling plate 505 has a cylindrical portion (portion having a cylindrical shape) 505A and a disk portion (disc shape) extending radially outward from the end portion thereof. Portion) 505B, the cylindrical portion 505A is disposed between the mounting holes of the positive-side rectifying element 502 and the positive-side radiating fin 501, and the disk portion 505B is substantially parallel to and spaced apart from the positive-side radiating fin 501. Placed in position. The disk portion 505 </ b> B is disposed on the protective cover 8 side and in the vicinity of the cooling air suction window 81 provided on the protective cover 8.

  Similarly, the negative electrode side cooling plate 506 is made of metal, and a part thereof is disposed between the attachment holes of the negative electrode side rectifying element 504 and the negative electrode side heat radiation fin 503, and the remaining portion is formed from the surface of the negative electrode side heat radiation fin 503. It protrudes. Specifically, as shown in FIG. 2, the negative-side cooling plate 506 includes a cylindrical portion 506 </ b> A and a disk portion 506 </ b> B extending radially outward from the end thereof, and the cylindrical portion 506 </ b> A is a negative electrode. The side rectifying element 504 and the negative electrode side radiating fin 503 are disposed between the mounting holes, and the disk portion 506B is disposed substantially parallel to the negative electrode side radiating fin 503 and spaced apart. Further, the disk portion 506B is disposed on the rear frame 3b side and in the middle of the ventilation path of the cooling air introduced from the suction window 82 formed between the protective cover 8 and the rear frame 3b.

  As shown by arrows in FIG. 2, between the protective cover 8 and the positive-side radiating fin 501, between the positive-side radiating fin 501 and the negative-side radiating fin 503, and between the negative-side radiating fin 503 and the rear frame 3 b, The cooling air introduced from the outside of the protective cover 8 flows along with the rotation of the cooling fan 26 provided in the rotor 2, and the positive air radiating fins 501 and the negative radiating fins 503 are simultaneously cooled by the cooling air. The side cooling plate 505 and the negative electrode side cooling plate 506 are cooled.

  As described above, in the vehicle alternator 1 of the present embodiment, the entire heat radiation combined with the positive-side radiating fins 501 and the negative-side radiating fins 503 is obtained by adding the positive-side cooling plate 505 and the negative-side cooling plate 506. Since the area can be enlarged, the cooling performance can be improved. The positive-side radiating fin 501 and the negative-side radiating fin 503 need not be complicated in shape, and can be manufactured by pressing a plate material. The added positive-side cooling plate 505 and negative-electrode are added. The side cooling plate 506 is fixed only by being sandwiched between the positive side rectifying element 502 and the like when the positive side rectifying element 502 is press-fitted into a mounting hole provided in the positive side radiating fin 501 and the like. It is unnecessary, and the rectifier 5 and the entire vehicle alternator 1 using the rectifier 5 can be easily manufactured, and the increase in cost can be suppressed.

  Further, in the positive side cooling plate 505 and the negative side cooling plate 506, the cylindrical portions 505A and 506A are disposed between the positive side rectifying element 502 and the mounting holes, and the disk portions 505B and 506B are the surfaces of the positive side radiating fins 501 and the like. Protruding from. Thereby, the positive electrode side cooling plate 505 or the like can be efficiently cooled by the cooling air flowing along the surface of the positive electrode side radiating fin 501 or the like. Since the disk portions 505B and 506B are arranged at positions that are substantially parallel to and spaced apart from the surface of the positive-side radiation fins 501 and the like, the height of the positive-side cooling plate 505 and the negative-side cooling plate 506 can be suppressed. The height of the rectifier 5 along the axial direction of the rotor 2 can be reduced. Further, since the cooling air flows between the disk portions 505B and 506B and the positive-side radiation fins 501 and the like, it is possible to further enhance these heat radiation effects.

  Moreover, since the positive electrode side cooling plate 505 and the negative electrode side cooling plate 506 protrude to one surface side of the positive electrode side radiating fins 501 and the like, the positive electrode side cooling plate 505 and the like are inserted from the protruding side to the rectifier 5. As a result, the rectifier 5 can be easily manufactured.

  Further, the positive side cooling plate 505 and the negative side cooling plate 506 are sandwiched and fixed between the rectifying element rectifying element 502 and the mounting hole by press-fitting the positive side rectifying element 502 and the like into the mounting hole. When attaching the rectifying element 502 or the like to the positive-side radiating fin 501 or the like, the positive-side cooling plate 505 or the like can be fixed at the same time, and the manufacturing process can be simplified.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment described above, the positive-side cooling plate 505 or the like is protruded on one surface side of the positive-side radiating fin 501 or the like, but as shown in FIG. The plate 505 or the like may be protruded. Thereby, the whole heat radiation area which combined the positive electrode side cooling plate 505 and the negative electrode side cooling plate 506, the positive electrode side radiation fin 501 and the negative electrode side radiation fin 503 can be expanded further, and cooling property can be improved further. .

  Moreover, as shown in FIG. 4, you may make it make the positive electrode side cooling plate 505 etc. protrude on the opposite surface side of the positive electrode side radiation fin 501 etc. As shown in FIG. In the above-described embodiment, the positive-side cooling plate 505 is attached to the positive-side radiation fin 501 and the negative-side cooling plate 506 is attached to the negative-side radiation fin 503. However, only one of them may be attached. In the above-described embodiment, the materials of the positive-side cooling plate 505 and the negative-side cooling plate 506 have not been described. However, the same material (for example, aluminum) as the positive-side heat-dissipating fins 501 and the negative-electrode-side heat dissipating fins 503 may be used. However, different materials may be used. In particular, if the positive electrode side radiating fins 501 and the negative electrode side radiating fins 503 are formed of aluminum, and the positive electrode side cooling plate 505 and the negative electrode side cooling plate 506 are formed of copper having better heat conductivity than aluminum, the temperature Therefore, it is possible to more effectively cool the positive-side rectifying element 502 and the negative-side rectifying element 504 that are high. Further, when there is a difference in temperature between the positive-side radiating fin 501 and the negative-side radiating fin 503, the positive-side cooling plate 505 or the negative-side cooling plate 506 may be attached only to the radiating fin having the higher temperature. .

  As shown in FIGS. 3 and 4, the positive-side cooling plate 505 is arranged on the lead portion 510 side so as to have a cylindrical portion and a disk portion extending radially outward from the end portion thereof. Even if a car shampoo or snowmelt salt water droplets reach from the lead, it can be prevented from reaching the lead part, so it is obvious that the reliability of the generator can be improved by preventing electrolytic corrosion at this part. No. Even if the negative electrode side cooling plate 506 is arranged in the same manner as in FIGS. 3 and 4, the same reliability improvement effect can be obtained.

It is sectional drawing of the alternating current generator for vehicles of one Embodiment. It is a fragmentary sectional view of the AC generator for vehicles which shows the section structure of a rectifier. It is a figure which shows the modification of a cooling plate. It is a figure which shows the modification of a cooling plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC generator for vehicles 2 Rotor 3a Front frame 3b Rear frame 4 Stator 5 Rectifier 8 Protection cover 26 Cooling fan 501 Positive side radiation fin 502 Positive side rectification element 503 Negative side radiation fin 504 Negative side rectification element 505 Positive side Cooling plate 506 Negative side cooling plate

Claims (5)

A cooling fan that rotates in conjunction with the rotor, a stator having a stator winding, and a rectifier that rectifies an alternating electromotive force generated in the stator winding into a direct current,
The rectifying device includes a plurality of rectifying elements, a first metal radiating fin into which the rectifying elements are press-fitted into a mounting hole, and a second part of which is sandwiched between the rectifying element and the mounting hole. With radiating fins ,
A part of the second radiating fin is disposed between the rectifying element and the mounting hole, the remaining part protrudes from the surface of the first radiating fin, and the protruding part covers the rectifying device. automotive alternator which is characterized that you have been placed in the middle of the air passage of the cooling air flowing along the surface of the first heat radiation fins is introduced from the outside of the protective cover. In claim 1,
The AC generator for vehicles, wherein the second radiating fin is disposed at a position where the remaining portion is substantially parallel to and spaced from the surface of the first radiating fin. In claim 2,
The AC generator for vehicles, wherein the remaining portion of the second radiating fin protrudes toward one surface of the first radiating fin. In claim 2,
The mounting hole is a through hole provided in the first heat dissipating fin,
The second AC radiator fin is characterized in that the remaining portion protrudes from both surfaces of the first radiator fin. In any one of Claims 1-4,
The AC generator for vehicles, wherein the second radiating fin is clamped and fixed between the rectifying element and the mounting hole by press-fitting the rectifying element into the mounting hole.

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