JP2002119009A - Dynamo-electric machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine for vehicle, capable of decreasing the types of frames, for cost reduction. SOLUTION: A cylindrical body is formed out of a brush holder 53 and a slipping cover 54. A seal structure is formed by arranging a sealing member 56, having a suction opening 150 on one end of the cylindrical body and a sealing member 55, having a delivery opening 152 on the other end, respectively. The sealing member 55 is composed of an annular part 154 and a leading part 158 for leading a path 156 communicating with a space on the inner periphery of the annular part 154 in the radial direction, and an opening on the front end of the leading part 158 serves as a delivery opening 152. The seal member 55 is attached, so that the delivery opening 152 faces the ground, when it is mounted on the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine for vehicles mounted on passenger cars, trucks and the like.

[0002]

2. Description of the Related Art Conventionally, in an automotive alternator, water or oil or the like is prevented from entering a slip ring formed near one end of a rotating shaft of a rotor, and a brush slides on the slip ring. A brush holder and a slip ring cover assembled via a seal member are used to discharge abrasion powder generated by the brush. These brush holders, slip ring covers,
The airtightness of the internal space around the brush is maintained by the seal member.For example, air introduced into the internal space from a suction port provided near the rear cover is discharged from a discharge port formed inside the rear frame. As a result, the abrasion powder of the brush is discharged.

[0003]

By the way, when a vehicle alternator having the above-described structure around the brush is mounted on a vehicle, if a discharge port formed inside the rear frame is directed to the top, water is exposed. As a result, water or the like that has reached the inside of the frame may enter the internal space around the brush from the discharge port and adhere to the brush or the slip ring, causing abnormal wear. For this reason, it is actually necessary to design the structure of the frame so that the discharge port formed inside the frame faces the ground according to the mounting direction of the vehicle alternator. There has been a problem that various types of frames are required, resulting in high costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicular rotating electric machine capable of reducing the number of types of frames and reducing costs. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a rotating electric machine for a vehicle according to the present invention maintains the airtightness of a slip ring, a brush that slides on an outer peripheral surface thereof, and a surrounding space thereof. And a suction port for sucking air and a discharge port for discharging air are formed in the seal structure. Instead of forming an outlet in the frame that leads to the space around the slip ring and brush,
Since the seal structure is used to maintain the airtightness of the peripheral space, it is not necessary to change the shape of the frame in the vicinity of the outlet according to the mounting direction of the rotating electric machine for a vehicle, thereby reducing the number of types of the frame. This allows for cost reduction.

In addition, the above-described sealing structure is provided with a brush holder for holding a brush, a cylindrical slip ring cover for covering the outer periphery of the slip ring, and suction at one end of the slip ring cover along the rotation axis. A first seal member having a port formed therein, and a second seal member disposed at the other end of the slip ring cover and having a discharge port formed therein, and the second seal member includes:
It is desirable to have a passage communicating the surrounding space and the discharge port along the radial direction. Air sucked into a peripheral space such as a slip ring from a suction port formed in the first seal member is formed on a second seal member disposed on the opposite side of the peripheral space from the first seal member. The air in the surrounding space such as the slip ring can be efficiently exchanged because the air can be guided to the outlet through the formed passage and discharged.

Further, when the rotor on which the slip ring is formed is provided with a cooling fan for generating cooling air flowing from the inner peripheral side to the outer peripheral side, the above-described discharge port is connected to the inner peripheral side of the cooling fan. It is desirable to form in the vicinity. Since a negative pressure is generated near the inner peripheral side of the cooling fan, by arranging a discharge port in this space, air in a peripheral space such as a slip ring can be forcibly discharged.

It is desirable that the second seal member is assembled so that the discharge port faces the ground when mounted on a vehicle. By changing the assembling direction of the second seal member, the outlet can be directed toward the ground, so that it is possible to reliably prevent water or the like from entering through the outlet.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle AC generator according to an embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of an automotive alternator. The automotive alternator 1 shown in FIG. 1 includes a stator 2, a rotor 3, a frame 4, a brush device 5, a rear cover 6, and the like.

The stator 2 includes a stator core 22, a three-phase stator winding 23, and an insulator 24 for electrically insulating the stator core 22 and the stator winding 23 from each other.

The rotor 3 has a field winding 31 formed by winding an insulated copper wire in a cylindrical and concentric manner, each of which has a length of 6 mm.
The rotation axis 33 is provided by the pole core 32 having the claw portions.
Has a structure sandwiched from both sides. Also,
A cooling fan 35 for discharging the cooling air sucked in from the front side in the axial direction and the radial direction is attached to the end face of the pole core 32 on the front side by welding or the like. Similarly, a cooling fan 36 for discharging the cooling air sucked from the rear side in the radial direction is attached to an end face of the pole core 32 on the rear side by welding or the like. In the vicinity of the rear end of the rotating shaft 33, two slip rings 37 electrically connected to both ends of the field winding 31,
38 are formed, and these slip rings 37,
Power is supplied from the brush device 5 to the field winding 31 via 38.

The frame 4 accommodates the stator 2 and the rotor 3. The rotor 3 is supported rotatably about a rotation shaft 33, and the outer periphery of the pole core 32 of the rotor 3. Is fixed to the stator 2 disposed with a predetermined gap therebetween. Further, the frame 4 has a discharge window 42 for cooling air at a portion facing the stator winding 23 protruding from the axial end face of the stator core 22, and has a suction window 41 at the axial end face.

The brush device 5 includes two slip rings 3
Two brushes 51 and 52 slidingly contacting each of 7 and 38
, A slip ring cover 54 that covers the outer circumference of the slip rings 37 and 38 together with the brush holder 53, and a slip ring 37 that is disposed at the axial ends of the brush holder 53 and the slip ring cover 54 during assembly. 38, two seal members 55 and 56 for improving the airtightness of the peripheral space.

The rear cover 6 includes a brush device 5, a rectifying device, and an IC mounted on the outside of the frame 4 on the rear side.
Mounted over the regulator to protect them from foreign matter.

Vehicle alternator 1 having the above structure
When a rotational force from an engine (not shown) is transmitted to the pulley 20 via a belt or the like, the rotor 3 rotates in a predetermined direction. In this state, by applying an excitation voltage to the field winding 31 of the rotor 3 from the outside, each claw of the pole core 32 is excited, and a three-phase AC voltage can be generated in the stator winding 23. From the output terminal 10, a predetermined direct current is extracted.

Next, the details of the seal structure around the brush device 5 will be described. FIG. 2 is a partial sectional view showing details around the brush device. As shown in FIG. 2, the processing range along the axial direction including the two slip rings 37 and 38 is surrounded by a cylinder formed by the brush holder 53 and the slip ring cover 54.

A suction port 150 is provided at the rear end face of the cylindrical body.
Is formed on one of the seal members 56.
The seal member 56 is attached between the end surface of the above-described cylinder and the rear cover 6 with deformation, and airtightness at a contact surface with the end surface of the cylinder is maintained.

The other seal member 55 having a discharge port 152 is disposed on the front side (pulley side) end face of the above-mentioned cylindrical body. FIG. 3 is a plan view showing the detailed shape of the seal member 55 arranged on the front side.
FIG. 4 is a sectional view taken along line IV-IV of FIG. As shown in these figures, the seal member 55 is used to radially pull out an annular portion 154 abutting on the front end surface of the cylindrical body and a passage 156 communicating with a space on the inner peripheral side of the annular portion 154. And a drawer 158 provided. One surface of the seal member 55 is in contact with the above-described cylinder,
The other surface is in contact with the end surface of the rear frame 4. The passage 156 is formed by closing the opening of the recess formed in the contact surface with the frame 4 with the frame 4. The drawer 158 has an L-shaped cross section, and a discharge port 152 as an open end of the passage 156 is formed at a tip of the drawer 158.

FIG. 5 is a plan view of the rear frame 4 in the mounting direction of the brush device 5, that is, the sealing member 55.
The shape of the side on which abuts against is shown. As shown in FIG. 5, the rear frame 4 is provided with a cooling air intake 4.
It has two suction windows 41. These four suction windows 41
3 and the inner diameter r of the L-shaped portion at the tip of the lead-out portion 158 of the seal member 55 shown in FIGS. 3 and 4, the seal member 55 satisfies the relationship of r ≧ R. Is set.

When the above-described seal member 55 is assembled, the L-shaped portion of the leading end of the drawer 158 is
In such a manner as to protrude from any of the four suction windows 41 formed in the vehicle, and when the vehicle alternator 1 is mounted on the vehicle, the drawing direction of the drawing portion 158 is directed to the ground direction. Accordingly, the outlet 152 formed at the tip of the drawer 158 is disposed near the inner periphery of the cooling fan 36 joined to the rear end face of the rotor 3 so as to face the ground when mounted on the vehicle. Is done. In addition, the frame 4
When the suction window 41 is not present, the assembling direction is set such that the drawer 158 is closest to the ground.

The sealing structure around the brush device 5 is formed in this way. When the inner peripheral side of the cooling device 36 becomes negative pressure due to the rotation of the cooling fan 36, a suction port 150 formed in one of the sealing members 56 is opened. Air is sucked into the spaces around the slip rings 37 and 38 and the brushes 51 and 52, and the sucked air is discharged through a passage 156 and a discharge port 152 formed in the other seal member 55. Therefore, air can be efficiently introduced and discharged into the peripheral space such as the slip ring 37, and the brush abrasion powder in the peripheral space can be removed and the slip ring 37 and the like can be cooled.

Further, in the vehicle alternator 1 of the present embodiment, when the mounting direction on the vehicle is changed, the direction of the discharge port 152 is changed to the ground direction only by changing the mounting angle of the seal member 55. Alternatively, it can be changed to a direction closer to the ground direction. At this time, paying attention to the rear frame 4, it is not necessary to change the shape in particular, so that it is possible to reduce the number of types of frames, and to reduce costs by reducing the number of parts or the labor for parts management. Can be.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the draw-out portion 158 of the seal member 55 is formed in an L-shape. However, the discharge port 152 may be opened in the radial direction without bending the discharge port 152 side.

In the above-described embodiment, the seal structure around the brush device of the vehicle alternator has been described. However, in the case of having the same structure, a rotating electric machine for vehicles other than the vehicle alternator is used. The present invention can be applied to

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle alternator.

FIG. 2 is a partial cross-sectional view showing details around a brush device.

FIG. 3 is a plan view showing a detailed shape of a seal member arranged on a front side.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a plan view of a rear frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle alternator 5 Brush device 37, 38 Slip ring 51, 52 Brush 53 Brush holder 54 Slip ring cover 55, 56 Seal member 150 Suction port 152 Discharge port 154 Annular part 156 Passage 158 Drawing part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H605 AA03 BB03 CC02 CC07 DD07 DD12 DD18 DD33 EA26 EC05 EC08 5H613 AA06 BB15 BB27 GB09 QQ02 QQ07 RR06 SS02 SS03 5H619 AA13 BB02 BB06 BB17 BB22 PP02 PP10 PP25 PP28

Claims (4)

[Claims] 1. A slip ring provided on a rotating shaft of a rotor, a brush slidably contacting an outer peripheral surface of the slip ring, and a seal structure for maintaining airtightness between the slip ring and a surrounding space of the brush. A rotary electric machine for a vehicle, wherein a suction port for sucking air into the surrounding space and a discharge port for discharging air sucked into the internal space are formed in the seal structure. 2. The seal structure according to claim 1, wherein the seal structure includes a brush holder that holds the brush, a cylindrical slip ring cover that covers an outer periphery of the slip ring, and a slip ring cover that extends along the rotation axis. A first seal member disposed on one end side and having the suction port formed thereon, and a second seal member disposed on the other end side of the slip ring cover and formed with the discharge port. Wherein the second seal member has a passage communicating the surrounding space and the discharge port along a radial direction. 3. The rotor according to claim 2, wherein the rotor is provided on a side on which the slip ring is formed.
A rotating electric machine for a vehicle, comprising: a cooling fan that generates cooling air flowing from an inner peripheral side to an outer peripheral side; and wherein the discharge port is formed near an inner peripheral side of the cooling fan. 4. The rotating electric machine for a vehicle according to claim 2, wherein the second seal member is assembled so that the discharge port faces a ground direction in a state of being mounted on the vehicle.