JPH05161315A - Alternator for vehicle - Google Patents

Abstract

PURPOSE:To provide a structure of a slip ring having excellent waterproofness and excellent assembly properties. CONSTITUTION:A substantially cylindrical slip ring cover 18 is disposed at an outer peripheral side of a slip ring 9. An opening 18b to be engaged with a brush holder 13 is provided on an upper surface of the cover. Rugged parts 18a are formed in the opening and on a lower surface of the holder to be engaged fixedly with each other. A substantially archlike protrusion 18c is formed at one axial end side of the opening, and contained in a containing part of the holder. A plurality of protrusions 18d are formed on the outer periphery of the cover, and tunnels 18g communicating with the inside of the cover is provided inside the protrusions. Further, sealing materials 17a, 17b having excellent elasticity are disposed at both axial end faces of the cover.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular AC generator, and more particularly to a structure of a slip ring portion which is excellent in waterproofness and easy to assemble.

[0002]

2. Description of the Related Art Conventionally, the structure of a slip ring portion of an alternator for a vehicle is generally of an open type as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 58-148640.

[0003]

However, in the above-mentioned prior art, water and muddy water invade the slip ring portion in vehicles traveling in wetlands and swamps, and also in general vehicles to prevent freezing in winter. There was a problem in that salt water due to sodium chloride or calcium chloride sprayed on the road entered the slip ring portion, causing abnormal wear of the brush. In order to solve this problem, a slip ring part is hermetically sealed, but the structure is complicated and the assemblability is poor. Further, there is a problem that sliding heat is accumulated by the brush and the slip ring, and abnormal wear of the brush occurs due to high temperature.

It is a first object of the present invention to provide an alternator for a vehicle, which blocks water from entering the slip ring portion and is excellent in assemblability. A second object of the present invention is to provide an alternator for a vehicle, which can shut off water in the slip ring portion and can perform ventilation.

[0005]

In order to achieve the above first object, the present invention provides a slip ring cover having an opening for fitting with a brush holder on the outer circumference of the slip ring, and the inner diameter of the brush holder. Side axial direction both sides of the side and the opening portion of the slip ring cover to form an uneven portion to engage with each other, the axial length of the slip ring cover is longer than the brush holder, the brush holder in the portion protruding from the brush holder. Form an axial positioning portion that engages. Preferably, the axial positioning portion is an arch-shaped convex portion formed on one end side in the axial direction of the opening, and in this case, the brush holder is provided with a corresponding concave portion, and the concave portion is provided with the arch-shaped convex portion. Store closely.

Further, it is preferable that a recess is formed in a portion projecting from the brush holder on both axial end faces of the slip ring cover, and a pair of seal members are arranged in the recess. In this case, the seal member is formed of, for example, an elastic punching material. Further, preferably, the outer periphery of one end portion in the axial direction of the slip ring cover, which projects from the brush holder, is housed in the recess of the rear cover that covers the slip ring cover. Further, in order to achieve the second object, a plurality of protrusions that form a tunnel inside are formed on the outer peripheral surface of the slip ring cover, and these tunnels communicate with the inside of the slip ring cover.

[0007]

By providing the slip ring cover on the outer circumference of the slip ring, the slip ring is protected against flooding from the outside, except for the connection portion with the brush holder and both axial end surfaces of the slip ring cover. When the slip ring cover is incorporated into the brush holder, the axial positioning portion of the slip ring cover engages with the brush holder to achieve axial positioning. When the axial positioning portion is an arch-shaped convex portion, the positioning is performed by closely accommodating the arch-shaped convex portion in the concave portion of the brush holder, and then the concave-convex portion provided on each of them is engaged. The radial position is determined. That is, the positioning when the slip ring cover is incorporated into the brush holder is simplified, and the assembling property is improved.

Ventilation inside and outside the slip ring cover is also prevented while preventing muddy water or the like scattered on the slip ring cover from entering the cover through tunnels inside the protrusions provided on the outer circumference of the slip ring cover. Is possible. Regarding the axial end faces of the slip ring cover that connects to the brush holder, a good seal can be obtained by arranging a highly elastic seal material on the axial end faces of the slip ring cover, such as closed-cell sponge rubber. Can be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The vehicle alternator of this embodiment has a shaft 12
And has a slip ring 9 on the outer periphery of the end of the shaft 1.
Is fixed, and the pulley 2 to which the rotation from the engine is transmitted is fixed to the other end. A field coil 4 is wound around a pair of rotor cores 3a and 3b in which a plurality of claw-shaped magnetic poles are arranged on the outer peripheral portion, and one end of the field coil 4 is electrically connected to a slip ring 9. There is. Fans 5a and 5b are fixed to both side surfaces of the rotor cores 3a and 3b. Shaft 1, pair of rotor cores 3a, 3
b, the field coil 4, the fans 5a and 5b, and the slip ring 9 are provided on the outer peripheral side of the rotor 3 with the stator 6 wound around the stator coil 6a with a minute gap.

A front bracket 7 and a rear bracket 8 are arranged so as to support the stator 6 from both sides. Bearings 10 and 11 are fixed to the inner circumferences of the end surfaces of the pair of brackets 7 and 8, respectively, to hold the shaft 1 rotatably. The slip ring 9 projects from the rear bracket 8.

A diode bridge 14 for full-wave rectifying the electric power induced in the starter coil 6a and a regulator 15 for controlling the full-wave rectified output voltage are fixed to the rear surface of the rear bracket 7, and further outside thereof. A rear cover 16 is disposed to cover the.

On the outer circumference of the slip ring 9, (+),
The (−) side brushes 12a and 12b are in contact with each other. The brushes 12a and 12b are housed in a resinous brush holder 13, and the springs 19 housed together press the brushes 12a and 12b against the slip ring 9 with a predetermined pressure at all times. Further, the outer periphery of the slip ring 9 is covered with a cylindrical slip ring cover 18 having an opening 18b that fits into the brush holder 13.

A pair of concavities and convexities 13a are formed on both sides of the brush holder 13 on the inner diameter side in the axial direction, and they engage with the concavo-convex portions 18a formed on the axial side of the opening 18 of the slip ring cover 18 so that they are mutually engaged. Are fitted and fixed.
Further, the axial length of the slip ring cover 18 is longer than that of the brush holder 13, and the opening 18 of the slip ring cover 18 which is a portion protruding from the brush holder 13 is formed.
A substantially arch-shaped projecting portion 18c is formed on one axial side of b, and is housed in close contact with an arch-shaped housing portion 13b formed integrally with the brush holder 13.

Further, a plurality of protrusions 18d are provided on the outer peripheral surface of the substantially cylindrical portion of the slip ring cover 18, and the insides of the protrusions 18d communicate with the inside of the slip ring cover 18 as shown in FIG. A tunnel 18g is formed to allow the air inside and outside the slip ring cover 18 to be ventilated. In addition, on the axial end surface of the slip ring cover 18, recesses 18e and 18f that are open to the outside are formed in a portion longer than the axial length of the brush holder 13, and between the recess 18e and the rear bracket 7. Packing 1
A packing 17b is disposed between the recessed portion 18f and the rear cover 16, and the outer periphery of the recessed portion 18f is housed in the storage portion of the rear cover 16 and positioned.

The procedure for incorporating the slip ring cover 18 into the brush holder 13 with the above configuration is as follows.
First, the arch-shaped convex portion 18c of the slip ring cover 18
By pushing the tape into the arch-shaped storage portion 13b of the brush holder 13 and tightly storing the same, the arch-shaped convex portion 18c forms the slip ring cover 18 for the brush holder 13.
As well as serving as an axial positioning and stopper of the slip ring cover 18, the uneven portions 18a provided on both sides of the opening 18b of the slip ring cover 18 slide into the uneven portions 13a formed on both sides of the inner diameter side of the brush holder 13. Becomes Further, when the arch-shaped convex portion 18c of the slip ring cover 18 is tightly stored in the arch-shaped storage portion 13b of the brush holder 13, the pushing force of the arch-shaped convex portion 18c is provided on both sides of the opening 18b of the slip ring cover 18. 18a bites into the concave and convex portions 13a formed on both inner diameter side portions of the brush holder 13 and is set in a predetermined position. After that, the packings 17a and 17b are fitted into the recesses 18e and 18f formed on both axial end surfaces of the slip ring cover 18.

Next, the brush assembly assembled as described above, the diode bridge 14 and the regulator 15 are fixed to each other and set on the rear bracket. Further, a rear cover 1 in a shape that covers them from the outside.
Tighten 6 with screws etc. to fix. At that time, the slip ring cover 18, the rear bracket 8, and the rear cover 16
The packings 17a and 17b between the parts bend and the gaps between the parts are eliminated, so that muddy water entering from the axial direction of the slip ring cover 18 is blocked.

In the above description, since the surfaces of the packings 17a and 17b contacting each other are flat surfaces, the packings 17a and 1b
7b does not have to be an expensive die-molded product, but a product formed from an inexpensive punching material is sufficient. Since the slip ring cover 18 has a substantially cylindrical cylinder shape in the radial direction, even if muddy water or the like scatters, it does not enter the slip ring cover 18. However, a plurality of protrusions 18d provided on the outer periphery of the slip ring cover 18
The inside and outside of the slip ring cover 18 is ventilated through a tunnel 18g formed inside.

[0018]

According to the present invention, since the slip ring cover is easily engaged with the brush holder by fitting and the positioning when the slip ring cover is incorporated into the brush holder is easy, the waterproof property is excellent and the assembling property is good. It is good and inexpensive. Further, there is an effect that the infiltration of muddy water and the like to the slip ring portion can be blocked and only ventilation can be performed through the tunnel inside the protrusion. Also, since the seal material is arranged on both axial end surfaces of the slip ring cover,
There is also an effect that good sealing can be performed.

[Brief description of drawings]

FIG. 1 is a sectional view of an automotive alternator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a brush assembly.

FIG. 3 is a perspective view of a slip ring cover.

FIG. 4 is a side view of the brush holder as viewed from the right in FIG.

FIG. 5 is a side view of the brush holder as viewed from the left in FIG.

[Explanation of symbols]

1 Shaft 3 Rotor 4 Field Coil 7 Front Bracket 8 Rear Bracket 9 Slip Ring 10, 11 Bearings 12a, 12b Brush 13 Brush Holder 13a Concavo-convex portion 13b Arched Storage 17a, 17b Packing (seal material) 18 Slip Ring Cover 18a Concavo-convex Part 18b Opening part 18c Arch-shaped convex part 18d Protrusions 18e, 18f Concave part on axial end face of slip ring cover 18g Tunnel

Claims (7)

[Claims] 1. A rotor, which is mechanically fixed to a shaft driven by an engine or the like, and around which a field coil is wound, a pair of bearings that rotatably support the rotor, and the bearings are housed on the inner diameter side. A pair of brackets,
A slip ring that is provided on one end of the shaft outside one of the brackets and that is connected to the field coil, a brush holder that accommodates a brush that is in sliding contact with the slip ring, and is arranged on the outer periphery of the slip ring, In a vehicular AC generator composed of a brush holder and a slip ring cover having an opening for fitting,
The brush holder is formed with concave and convex portions that engage with each other on both sides in the axial direction on the inner diameter side of the brush holder and the opening of the slip ring cover, and the axial length of the slip ring cover is longer than that of the brush holder. An alternating current generator for a vehicle, wherein an axial positioning portion that engages with the brush holder is formed in a more protruding portion. 2. The vehicle alternator according to claim 1, wherein the axial positioning portion is an arch-shaped convex portion formed on one end side in the axial direction of the opening, and corresponds to the brush holder. A vehicular AC generator characterized in that a concave portion is formed, and the arch-shaped convex portion is tightly accommodated in the concave portion. 3. The vehicle alternator according to claim 1, wherein a plurality of protrusions forming an inner tunnel are formed on the outer peripheral surface of the slip ring cover, and the tunnels communicate with the inner side of the slip ring cover. An alternator for vehicles, which is characterized in that 4. The vehicle alternator according to claim 1, wherein a recess is formed in a portion projecting from the brush holder on both axial end surfaces of the slip ring cover, and a pair of seal members are arranged in the recess. An alternator for vehicles characterized by the above. 5. The vehicular AC generator according to claim 4, wherein the seal member is formed of an elastic punching material. 6. The vehicle alternator according to claim 4, wherein the outer periphery of one end of the slip ring cover in the axial direction protruding from the brush holder is housed in a recess of a rear cover that covers the slip ring cover. Characteristic vehicle alternator. 7. A rotor, which is mechanically fixed to a shaft driven by an engine or the like, and around which a field coil is wound, a pair of bearings that rotatably support the rotor, and the bearings are housed on the inner diameter side. A pair of brackets,
A slip ring that is provided on one end of the shaft outside one of the brackets and that is connected to the field coil, a brush holder that accommodates a brush that is in sliding contact with the slip ring, and is arranged on the outer periphery of the slip ring, In a vehicle alternator comprising a brush holder and a slip ring cover having an opening that fits in the vehicle holder, an inner surface of the brush holder on both sides in the axial direction and recesses and protrusions that engage with the opening of the slip ring cover. And a plurality of protrusions forming an inner tunnel on the outer peripheral surface of the slip ring cover, and these tunnels communicate with the inner side of the slip ring cover.