JP2002315283A - Rotating electric machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electric machine for vehicle capable of surely preventing infiltration of foreign matters into a space surrounding a brush or a slip ring, or into the periphery of a bearing through an exhaust opening. SOLUTION: A cylindrical body is constituted of a brush holder 53 and a slip ring cover 54. A sealing member 56 with an attraction opening 150 is located at one end of the cylindrical body, and a sealing member 55 is located at the other end of the cylindrical body to form a sealing mechanism. A groove section 43, which is led to an inner space in a bearing housing 44, is formed in the end surface of a frame 4 facing the sealing member 55. An axial opening 43a in the groove section 43 is blocked by a cover 55a which has an outer edge of the sealing member 55 extended.

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. For example, Japanese Patent Laying-Open No. 9-182353 discloses a vehicle alternator having such a structure. The airtightness of the internal space around the brush is maintained by the brush holder, the slip ring cover, and the seal member, and the air introduced into the internal space from the suction port provided near the rear cover is formed inside the rear frame. The abrasion powder of the brush is discharged by being discharged from the discharged outlet. In addition, a foreign matter intrusion prevention wall is provided around the outlet, so that foreign matter such as water flowing along the outer peripheral surface of the slip ring cover is prevented from entering through the axial opening of the outlet. ing.

[0003]

By the way, in the above-mentioned conventional structure around the brush, since a foreign matter intrusion prevention wall is provided around the discharge port, water or the like flowing along the outer peripheral surface of the slip ring cover. Can be effectively prevented from entering the discharge port, but when water drops or the like directly fly into the axial opening of the discharge port, there is a problem that intrusion of foreign matter cannot be prevented. Was. Such intrusion of foreign matter causes abnormal wear of the brush and the slip ring. In addition, the above-described discharge port is connected to the bearing storage portion, and when a foreign substance such as water enters the inside of the bearing, the durability of the bearing is greatly reduced.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to surely prevent foreign matter from entering a space around a brush or a slip ring or a bearing around through a discharge port. It is an object of the present invention to provide a vehicular rotating electric machine that can perform the above-described operations.

[0005]

In order to solve the above-mentioned problems, a rotating electric machine for a vehicle according to the present invention comprises a slip ring provided on a rotating shaft of a rotor, and a brush which slides on an outer peripheral surface of the slip ring. A cover for covering the space around the slip ring and the brush, a seal member inserted between the frame supporting the rotor and the cover to ensure airtightness therebetween, and an opening provided in the frame. And a ventilation path that connects the surrounding space. And the above-mentioned opening has an axial opening along the rotation axis and a radial opening perpendicular to the rotation axis, and closes the axial opening by partially extending the seal member. The radial opening is used as an outlet for discharging the air sucked into the internal space. Since the axial opening provided in the frame is closed by partially extending the sealing member, it is possible to prevent foreign matter from entering the axial opening by transmitting through the covering portion or directly flying. Can be prevented. Accordingly, it is possible to prevent the foreign matter from entering the surrounding space such as the slip ring and the slip ring and the brush from being abnormally worn.

Further, the above-mentioned seal member is formed of a flexible material, and when the inside of the ventilation passage becomes a negative pressure, the seal member comes into close contact with the opening in the axial direction, so that these members are formed. It is desirable to increase the adhesion between them. Thereby, the gap generated between the seal member and the frame can be reduced, and foreign matter can be prevented from entering the axial opening through this gap.

Further, the above-mentioned frame has a bearing accommodating portion for accommodating a bearing rotatably supporting the rotor, and a part of the closed space formed in a state where the bearing is accommodated in the bearing accommodating portion. It is desirable to use it as a part of the ventilation path. Thereby, it becomes easy to secure a ventilation path for discharging air and brush abrasion powder from a surrounding space such as a slip ring. Further, even in this case, it is possible to effectively prevent foreign matter from entering the internal space of the bearing storage portion through the bearing opening, thereby preventing the durability of the bearing from being reduced due to the foreign matter entering. be able to.

Further, it is desirable to further include a discharging means for forcibly discharging the air in the surrounding space. Thereby, since the surrounding space such as the slip ring can be forcibly ventilated, it is possible to reliably discharge air and wear from the surrounding space.

It is preferable that the above-mentioned discharging means is a blowing means which rotates integrally with the rotor to flow air near the discharging port radially outward. By creating such a flow of air, a negative pressure can be generated around the outlet, so that air and brush wear can be sucked and reliably discharged from the surrounding space such as the slip ring. Further, by using a cooling fan provided in the rotor as the blowing means, it is not necessary to add a special part, and it is possible to prevent an increase in cost.

[0010]

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 illustrating an overall configuration of a vehicle alternator according to an embodiment. 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 structure in which a field winding 31 in which an insulated copper wire is wound cylindrically and concentrically is sandwiched from both sides through a rotating shaft 33 by pole cores 32 each having six claws. have. Further, a cooling fan 35 for discharging the cooling air sucked from the front side in the axial direction and the radial direction is attached to an 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 a radial direction is attached to an end face of the rear pole core 32 by welding or the like. Also, the rotating shaft 33
In the vicinity of the rear end of the motor, two slip rings 37 and 38 electrically connected to both ends of the field winding 31 are formed. Power is supplied to the field winding 31.

The frame 4 houses the stator 2 and the rotor 3, and the rotor 3 is supported so as to be rotatable 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 a field winding 31 of the rotor 3.
This is for supplying an exciting current to the motor. This brush device 5
Is a brush holder 5 for accommodating two brushes 51 and 52 slidingly in contact with the two slip rings 37 and 38, respectively.
3, the slip ring 37 together with the brush holder 53,
A slip ring cover 54 covering the outer periphery of the brush holder 53 and the slip ring cover 5 at the time of assembly.
4, the slip rings 37, 38
Seal members 55 and 5 for improving the airtightness of the surrounding space
6 is included.

The rear cover 6 includes a brush device 5, a rectifying device, and an IC mounted outside the frame 4 on the rear side.
Mounted over the regulator to protect them from foreign matter. In the vehicle alternator 1 having the above-described structure, the rotor 3 rotates in a predetermined direction when a rotational force from an engine (not shown) is transmitted to the pulley 20 via a belt or the like. 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, a detailed structure around the brush device 5 will be described. FIG. 2 is a partial sectional view showing details around the brush device. FIG. 3 is a front view of the frame 4 on the rear side, and shows a state where the seal member 55 is arranged at a predetermined position of the frame 4. FIG. 4 is a cross-sectional view of FIG.
It is an IX-line enlarged sectional view. FIG. 5 is an enlarged view showing the shape of the discharge port.

As shown in FIG. 2, a predetermined range along the axial direction including the two slip rings 37 and 38 is surrounded by a cylindrical body as a covering formed by the brush holder 53 and the slip ring cover 54. I have. One sealing member 56 having a suction port 150 is disposed on the rear end surface of the cylindrical body. This sealing member 56
Is mounted between the end surface of the above-mentioned cylinder and the rear cover 6 with deformation, and the airtightness of the contact surface with the end surface of the cylinder is maintained. Further, the other flat plate-shaped sealing member 5 made of a flexible material (for example, rubber) is provided on the front side (pulley side) end surface of the above-described cylindrical body.
5 are arranged. The seal rubber 55 is attached between the brush holder 53, the slip ring cover 54, and the frame 4 with deformation, and the airtightness of the contact surface between them is maintained.

As shown in FIGS. 3 and 4, a groove 43 having an opening at the rear end in the axial direction and the outside in the radial direction is formed in the rear frame 4. This groove 43
Is formed by providing a concave portion on the inner diameter side surface of one suction window 41 provided in the frame 4, and a part of the concave portion receives a bearing 39 mounted on the rear side of the rotor 3. The internal space of the storage section 44 is exposed. The groove 43 has an axial opening 43a and a radial opening 43b. One axial opening 43a is closed by a lid 55a formed by partially extending the outer edge of the seal member 55 described above. The other radial opening 43 b is used as a discharge port 45 for the air discharged from the internal space side of the bearing storage section 44. The discharge port 45 is located near the inner periphery of a cooling fan 36 serving as a discharge unit and a blowing unit joined to the rear end surface of the rotor 3, and is arranged to face the ground when mounted on a vehicle. When the suction window 41 of the frame 4 does not exist in the ground direction, the forming direction of the groove 43 is set so that the outlet 45 is oriented closest to the ground direction.

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 as the cooling fan 36 rotates, a suction port 150 formed in one of the sealing members 56 is used. Air is sucked into the space around the slip rings 37 and 38 and the brushes 51 and 52, and the sucked air passes through the ventilation space formed by the internal space of the bearing housing 44 and the groove 43 from the outlet 45. Is discharged. Therefore, the slip ring 37
It is possible to efficiently introduce and discharge air into the surrounding space such as, for example, and it is possible to remove brush abrasion powder in the surrounding space and cool the slip ring 37 and the like.

Further, in the automotive alternator 1 of the present embodiment, the axial opening 43a of the groove 43 is closed by the lid 55a extending a part of the seal member 55, so that the slip ring cover 54 It is possible to prevent foreign matter such as water droplets that travel along the surface or fly directly toward the axial opening 43a from entering the groove 43. As a result, foreign substances such as water droplets enter the surrounding space such as the slip ring 37, and abnormally wear the slip rings 37 and 38 and the brushes 51 and 52, and foreign substances such as water droplets enter the internal space of the bearing housing portion 44. As a result, it is possible to prevent the durability of the bearing 39 from being significantly reduced.

In particular, since the lid 55a for closing the axial opening 43a of the groove 43 is formed by using a flexible member, when the discharge port 45 and the inside of the groove 43 become negative pressure. The lid 55a is drawn toward the groove 43. For this reason, as shown in FIG. 5, the gap 46 between the lid 55a and the frame 4 is reduced, and the adhesion between them is increased, so that the invasion of foreign matter from the groove 43 is effectively prevented. can do.

Further, since the lid portion 55a can be formed only by partially extending the outer edge portion of the seal member 55, it can be dealt with only by changing the shape of the seal member 55, and an increase in the number of fixtures is required. The increase in cost can be suppressed. Further, in the above-described embodiment, the flow of the air generated by the rotation of the cooling fan 36 is used to make the pressure around the discharge port 45 a negative pressure. Can be prevented.

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 seal structure around the brush device of the vehicle alternator has been described. However, if the same structure is used, the present invention is applied to a vehicular rotating electric machine other than the vehicle alternator. Can be applied.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a vehicle alternator according to an embodiment.

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

FIG. 3 is a front view of a rear frame.

FIG. 4 is an enlarged sectional view taken along line IX-IX of FIG. 3;

FIG. 5 is an enlarged view showing a shape of a discharge port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle alternator 5 Brush device 37, 38 Slip ring 43 Groove 43a Axial opening 43b Radial opening 44 Bearing storage part 45 Discharge port 51, 52 Brush 53 Brush holder 54 Slip ring cover 55, 56 Seal member 55a Lid

Continued on front page F-term (reference) 5H605 AA01 AA03 BB01 BB05 CC02 CC03 CC07 DD07 DD11 EA25 GG01 5H609 BB05 PP02 PP05 PP06 PP08 PP09 PP10 PP11 PP14 QQ02 QQ12 QQ13 RR03 RR20 RR27 5H613 AA06 BB05 BB14 BB13 SS13 BB17 PP01 PP04 PP06 PP19 PP20 PP24

Claims (5)

[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, a covering portion for covering the slip ring and a space around the brush, and supporting the rotor. A sealing member inserted between the frame and the covering portion to secure airtightness therebetween, and a ventilation path connecting the opening provided in the frame and the surrounding space. The opening has an axial opening along the rotation axis and a radial opening perpendicular to the rotation axis, and partially extends the seal member to form the axial opening. A rotating electrical machine for a vehicle, wherein the rotating electrical machine is closed and uses the radial opening as a discharge port for discharging air sucked into the internal space. 2. The seal member according to claim 1, wherein the seal member is formed of a material having flexibility, and when the inside of the ventilation passage becomes a negative pressure, the seal member faces the opening in the axial direction. A rotating electric machine for a vehicle, wherein the close contact enhances the adhesion between them. 3. The frame according to claim 1, wherein the frame has a bearing storage portion for storing a bearing for rotatably supporting the rotor, and the frame is stored in the bearing storage portion. A rotating electric machine for a vehicle, wherein a part of a closed space formed is used as a part of the ventilation path. 4. The rotating electric machine for a vehicle according to claim 1, further comprising a discharging unit for forcibly discharging air in the surrounding space. 5. The vehicle according to claim 4, wherein the discharge unit is a blower that rotates integrally with the rotor and flows air near the discharge port radially outward. For rotating electric machines.