JP4497215B2 - Vehicle alternator - Google Patents

Description

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

Conventionally, the brush portion of a vehicular AC generator has been designed to prevent water from entering the periphery of the slip ring by forming an intake / exhaust port at a position along the circumferential direction of the slip ring cover combined with the brush holder. The structure is known (for example, refer to Patent Document 1).
JP 2002-359951 A (page 3-6, FIG. 1-12)

  By the way, in the conventional structure disclosed in Patent Document 1, water is prevented by devising the shape of the brush device constituted by the brush holder and the slip ring cover. Therefore, if a large amount of water or the like enters through the rear cover, there is a possibility that the vicinity of the brush device is always wet. In this case, surrounding water or the like enters the slip ring cover through the intake / exhaust port provided in the slip ring cover, or closes the intake / exhaust port, resulting in high temperature air around the brush. As a result, the brush temperature rises.

  The present invention has been created in view of the above points, and an object of the present invention is to provide an automotive alternator that can prevent water intrusion around the brush and reduce the temperature around the brush. There is.

In order to solve the above-described problem, a vehicle AC generator according to the present invention includes a brush device that houses a brush that slides on a slip ring provided on a rotating shaft of a rotor and covers an outer peripheral portion of the slip ring; A frame on which an electrical component including the brush device is mounted; and a rear cover that covers the electrical component. The rear cover includes a wall portion that covers the periphery of the brush device, and the wall portion is a predetermined portion from the center of the rotating shaft. It has a plurality of partial walls that are arc-shaped with different radii and have different outer diameters, the plurality of partial walls are arranged side by side in the circumferential direction, and the plurality of partial walls that have different outer diameters are assembled to the vehicle. Sometimes it is located below the center of the rotation axis .

  By covering the periphery of the brush device with a wall portion, it is possible to reduce the intrusion of water or the like reaching the brush device and prevent water from entering the brush periphery. In addition, if the brush device has an intake / exhaust port, the intake / exhaust port will not be blocked, and air around the brush will not be trapped, so the temperature around the brush can be reduced. Become. Furthermore, since the wall portion is constituted by a plurality of partial walls having different outer diameters, at least a part of the wall portion can be separated from the brush device, so that water or the like that has entered between the wall portion and the brush device is retained. It becomes possible to prevent.

  The rear cover described above has a plurality of intake windows for taking in cooling air, and each of the plurality of partial walls is preferably arranged on the inner diameter side of the intake window. Thereby, it is possible to reliably prevent water or the like that has entered through the intake window of the rear cover from reaching the inner peripheral side of the wall portion.

In addition, it is desirable that a notch is formed in a part of the plurality of partial walls arranged below the center of the rotating shaft. Thereby, it is possible to prevent water or the like from accumulating below the brush device when the vehicle is assembled, and to promote drainage below the wall portion while suppressing backflow to the brush device.

  In addition, it is desirable that the plurality of partial walls described above are continuous with each other to form a wall portion that is not cut in the circumferential direction. Thereby, infiltration of water or the like into the inner peripheral side of the wall portion can be effectively prevented over the entire periphery of the wall portion.

Further, the wall portion described above, Ri partition walls der to prevent the water to the brush device and defines at least a brush device, by abutting the partition wall on the end face of the frame, a brush device of another ventilation path It is partitioned from. By partitioning the peripheral space of the brush device by the end face of the frame, the rear cover, and the partition wall, it is possible to reduce the intrusion of water or the like reaching the brush device and prevent water from entering the brush periphery.

  Moreover, it is desirable to provide a sealing member in the contact part with the frame of the partition wall mentioned above. Thereby, the airtightness of the surrounding space of a brush apparatus can be improved, and the water etc. which permeate the brush apparatus periphery can be excluded reliably.

  Moreover, it is desirable that two cylindrical portions that project in the axial direction and communicate with the space defined by the partition wall are formed on the end surface of the rear cover described above. Thereby, the surrounding space of a brush apparatus can be directly ventilated from the outside by a simple structure, and brush abrasion powder can be eliminated and the brush can be cooled.

  Moreover, it is desirable that the two cylindrical portions described above are connected to a vehicle-side intake / exhaust device via an intermediate member. Accordingly, reliable ventilation and brush powder discharge are possible with the operation of the intake / exhaust device, and for example, it is possible to obtain the effects of preventing entry of foreign matter and improving environmental performance even in a submerged usage environment.

  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 diagram illustrating an overall configuration of a vehicle AC generator according to an embodiment. A vehicle alternator 100 shown in FIG. 1 includes a front frame 1, a rear frame 2, a stator 4, a rotor 10, a rectifier 24, a voltage controller 25, a brush device 26, a rear cover 27, and the like. Has been.

  Both the front side frame 1 and the rear side frame 2 have a bowl shape, and are fixed to each other by a plurality of bolts 3 with the stators 4 sandwiched between the openings. . A cylindrical bearing box 7 is formed integrally with the front side frame 1, and an iron bearing box 8 is attached to the rear side frame 2 with bolts 9 having knurling.

  The stator 4 includes a stator core 5 and a stator winding 6. The rotor 10 includes a field winding 11, pole cores 12 and 13, a rotation shaft 14, and the like, and is rotatably held by a pair of bearings 15 and 16 fixed to the bearing boxes 7 and 8. Centrifugal cooling fans 17 and 18 are attached to the axial end surfaces of the pole cores 12 and 13. A pulley 19 is coupled to the front end of the rotary shaft 14 with a nut, and is rotated by a vehicle engine (not shown). Further, a pair of slip rings 21 and 22 are provided at the rear end of the rotating shaft 14 located outside the rear side frame 2 and are electrically connected to the field winding 11.

  So-called electrical components such as the rectifying device 24, the voltage control device 25, and the brush device 26 are fixed to the outer axial end surface of the rear frame 2 by fixing means such as bolts 9 and the like. The rectifier 24 rectifies and converts a three-phase AC voltage, which is an output voltage of the three-phase stator winding 6, into a DC output voltage, for example. The voltage control device 25 controls the output voltage of the vehicle AC generator 100 by adjusting the excitation current flowing through the field winding 11. The brush device 26 is for flowing an exciting current from the rectifier 24 to the field winding 11 of the rotor 10, and presses each of the slip rings 21 and 22 formed on the rotating shaft 14 of the rotor 10. Has a brush.

  The rear cover 27 is a protective cover as an outer shell made of resin, and covers and protects electrical components such as the rectifier 24, the voltage controller 25, and the brush device 26 that are attached to the outside of the rear frame 2. To do. The rear cover 27 is fastened and fixed to a bolt 9 extending from the rear frame 2 by a nut 28 in a state where the rectifier 24 is sandwiched. Details of the rear cover 27 will be described later.

  In the vehicular AC generator 100 having the above-described structure, when the rotational force from the vehicle engine is transmitted to the pulley 19 via a belt or the like, the rotor 10 rotates in a predetermined direction. In this state, by applying an excitation voltage from the outside to the field winding 11 of the rotor 10, the claw portions of the pole cores 12 and 13 are excited to generate a three-phase AC voltage in the stator winding 6. A predetermined direct current is taken out from an output terminal provided in the rectifier 24.

  FIG. 2 is a plan view of the rear cover 27 and shows a shape viewed from the inside (electrical component side). The rear cover 27 is integrally formed with a wall portion 50 that extends toward the brush device 26 along the rotation shaft 14. In FIG. 2, the wall portion 50 is hatched to clarify the shape. The wall 50 includes a plurality of partial walls 50A, 50B, 50C, and 50D having different outer diameters and a partial wall 50E that connects these partial walls in the radial direction. Part of the partial wall 50A and the partial wall 50C have an arc shape having a predetermined radius from the center of the rotating shaft 14, and the partial walls 50B and 50D have an arc shape having a larger radius. The three partial walls 50B, 50C, 50D having different outer diameters are disposed below the center of the rotating shaft 14 when assembled to the vehicle. In FIG. 2, the upper side of the paper surface corresponds to the top direction (the direction opposite to the ground) when the vehicle is assembled. A plurality of partial walls 50A, 50B, 50C, and 50D are continuous with each other to form a wall portion 50 that is not cut in the circumferential direction. Further, the rear cover 27 has a plurality of intake windows 54 for taking cooling air into the interior, and the partial walls 50A, 50B, 50C, and 50D constituting the wall part 50 are located on the inner side of these intake windows 54 ( The rotating shaft 14 and the brush device 26 are provided on the side).

  Next, the detailed structure of the brush device 26 combined with the rear cover 27 described above will be described. FIG. 3 is an enlarged cross-sectional view of the brush device 26 and shows a state where the brush device 26 is assembled to the vehicle alternator 100. FIG. 4 is a plan view of the brush holder included in the brush device 26 as seen from the radial direction. The brush device 26 includes a resin brush holder 60 in which the connection terminals 61 and 62 are embedded, a pigtail 63 as a brush copper wire that electrically connects the pair of brushes 51 and 52 and the connection terminals 61 and 62, and a resin product. The slip ring cover 70 and springs 64 and 65 are included.

  The brush holder 60 has a substantially box shape, and the side facing the slip rings 21 and 22 has brush storage portions 66 and 67 for storing the brushes 51 and 52, and a pigtail storage portion for storing the pigtail 63. 68 and 69 and a radial groove 80 into which the extending portion 73 of the lid portion 72 of the slip ring cover 70 is inserted are opened. Further, the brush holder 60 is formed with a lid portion 81 that covers an axial end portion located at the rear end (the end portion on the opposite side of the pulley) of the rotary shaft 14.

  The brush holder 60 and the slip ring cover 70 include a hole provided in the lid portion 81 that covers the axial end portion of the brush holder 60, and a convex portion provided in the lid portion 72 at the axial end portion of the slip ring cover 70. Are engaged with each other. An engaging portion is formed by these holes and convex portions. By using such an engaging portion, the assembly and fixing of the brush holder 60 and the slip ring cover 70 are facilitated, so that workability and air tightness are achieved. Can be improved. In the present embodiment, the slip ring cover 70 is provided with an intake / exhaust port 90 at a position that becomes the lower side (the direction of the ground) when the vehicular AC generator 100 is assembled to the vehicle.

  As described above, in the vehicle alternator 100 according to the present embodiment, by covering the periphery of the brush device 26 with the wall portion 50, the intrusion of water or the like reaching the brush device 26 is reduced and water intrusion around the brush is prevented. can do. In addition, when the brush device 26 is provided with the intake / exhaust port 90, the intake / exhaust port 90 is not blocked, and high-temperature air around the brush is not trapped. Is possible. Further, by configuring the wall 50 with a plurality of partial walls 50A, 50B, 50C, 50D having different outer diameters, at least a part of the wall 50 (partial walls 50B, 50D having a large diameter) is separated from the brush device 26. Therefore, it is possible to prevent stagnation of water or the like that has entered between the wall portion 50 and the brush device 26.

  In addition, the rear cover 27 has a plurality of intake windows 54 for taking in cooling air, and by disposing each of the plurality of partial walls 50A, 50B, 50C, 50D on the inner diameter side of the intake window 54, the rear cover 27 It is possible to reliably prevent water or the like that has entered through the intake window 54 from reaching the inner peripheral side of the wall 50.

  Further, the above-described plurality of partial walls 50A, 50B, 50C, 50D are continuous with each other to form a wall portion 50 that is not cut in the circumferential direction, thereby preventing water or the like from entering the inner peripheral side of the wall portion 50. This can be effectively prevented over the entire circumference of the portion 50.

  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 above-described embodiment, the plurality of partial walls 50A, 50B, 50C, and 50D are continuous, but by forming the plurality of partial walls discontinuously as shown in the modified example of the rear cover in FIG. The notch 51 may be formed. In the rear cover 27A shown in FIG. 5, the partial wall 50C is replaced with three partial walls 50C-1, 50C-2, and 50C-3 with respect to the rear cover 27 shown in FIG. These partial walls 50C-1, 50C-2, and 50C-3 have different radii from adjacent partial walls and are not radially continuous with the adjacent partial walls. A notch 51 is formed. The notch 51 is disposed below the center of the rotating shaft 14, and has an effect of promoting drainage below the wall 50 while suppressing the backflow to the brush device 26.

  FIG. 6 is a partial cross-sectional view of a vehicle AC generator according to another modification. In the vehicle generator 100A of this modification, a partition wall that partitions at least the brush device 26 and prevents the brush device 26 from being wet is formed in the rear cover 27B, and this partition wall is formed on the shaft of the rear side frame 2A. The brush device 26 is partitioned from other ventilation paths (cooling ventilation paths such as the rectifier 24 disposed outside the partition wall) by contacting the end face in the direction. The vehicle alternator 100A of the modification shown in FIG. 6 has the same basic structure as the vehicle alternator 100 shown in FIG. 1 and the like, and the differences will be mainly described below.

  Specifically, the rear cover 27 </ b> B is integrally formed with a wall portion 150 as a partition wall extending toward the brush device 26 along the rotation shaft 14. The wall 150 extends from the cooling air flow path generated by the rotation of the rotor 10 to the end surface of the rear side frame 2A so as to partition the brush device 26, and is arranged on the end surface of the rear side frame 2A. It abuts on a seal plate 160 as a sealing member. In addition, a cylindrical portion 201 that communicates with the periphery of the brush device 26 from the outside and a cylindrical portion 202 that communicates with the cylindrical portion 201 are formed on the end surface in the axial direction of the rear cover 27B, and is installed on the vehicle side. By connecting these two cylindrical portions 201 and 202 via an intermediate member, intake / exhaust to the surrounding space of the brush device 26 is performed through these two cylindrical portions 201 and 202. ing. Thereby, the foreign substance penetration | invasion to the brush apparatus 26 periphery can be prevented completely, and the brush lifetime improvement by brush temperature reduction and brush powder removal property improvement can be aimed at.

It is a figure showing the whole composition of the alternator for vehicles of one embodiment. It is a top view of a rear cover. It is an expanded sectional view of a brush apparatus. It is the top view which looked at the brush holder contained in a brush apparatus from radial direction. It is a figure which shows the modification of a rear cover. It is a fragmentary sectional view of the alternator for vehicles of the modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front side frame 2, 2A Rear side frame 4 Stator 10 Rotor 19 Pulley 21, 22 Slip ring 24 Rectifier 25 Voltage control device 26 Brush device 27, 27A, 27B Rear cover 50, 150 Wall part 50A, 50B, 50C, 50D, 50E Partial wall 51 Notch 90 Intake / exhaust port 100, 100A Vehicle alternator 160 Seal plate 201, 202 Cylindrical portion

Claims (8)

A brush device that houses a brush that slides on a slip ring provided on a rotating shaft of a rotor and covers an outer peripheral portion of the slip ring, a frame to which an electrical component including the brush device is attached, and a cover that covers the electrical component In an automotive alternator having a rear cover,
The rear cover has a wall portion that covers the periphery of the brush device;
The wall portion has a plurality of partial walls that have an arc shape having a predetermined radius from the center of the rotating shaft and have different outer diameters
The plurality of partial walls are arranged side by side in the circumferential direction ,
Wherein the plurality of partial walls outside diameter is different, the vehicle AC generator according to claim Rukoto disposed below the center of the rotation axis when assembled to the vehicle. In claim 1,
The rear cover has a plurality of intake windows for taking in cooling air,
Each of the plurality of partial walls is disposed on the inner diameter side of the intake window. In claim 1 or 2,
An AC generator for vehicles, wherein a notch is formed in a part of the plurality of partial walls disposed below the center of the rotating shaft. In claim 1 or 2,
The AC generator for vehicles, wherein the plurality of partial walls are continuous with each other to form the wall portion that is continuous in the circumferential direction. In claim 1,
The wall portion is a partition wall that partitions at least the brush device and prevents water from being applied to the brush device;
An AC generator for a vehicle, wherein the brush device is partitioned from another ventilation path by bringing the partition wall into contact with an end surface of the frame. In claim 5,
An AC generator for vehicles, wherein a seal member is provided at a contact portion of the partition wall with the frame. In claim 5 or 6,
2. An AC generator for a vehicle, wherein two cylindrical portions are formed on an end surface of the rear cover so as to project in an axial direction and communicate with a space defined by the partition wall. In claim 7,
The AC generator for vehicles, wherein the two cylindrical portions are connected to a vehicle-side intake / exhaust device via an intermediate member.

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