Feeder arrangement of vehicle AC generator

Details Feeder arrangement of vehicle AC generator Feeder arrangement of vehicle AC generator

1999-09-30

2001-09-25

Waks, Joseph (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S239000, C310S071000

Reexamination Certificate

active

06294856

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-312324, filed on Nov. 2, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an AC generator for a vehicle and, particularly a feeder arrangement of such an AC generator.
2. Description of the Related Art
In a vehicle AC generator, air is introduced to the contact surface of slip rings with brushes to prevent water, dust or foreign particles from clinging to the contact surface.
JP-B2 4-79224 discloses a feeder arrangement having a brush holder, a cylindrical slip-ring cover, a rubber seal-member which is provided with an air passage open to the contact surface, and a rear cover. The open end of the slip-ring cover is closed by the rubber seal member and the rear cover. However, it is difficult to close the slip-ring cover by the rubber seal member and the rear cover completely because of variation in sizes of the rear cover and the slip-ring cover.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide an improved feeder arrangement of a vehicle AC generator.
Another object of the invention is to provide a feeder arrangement having an improved air passage connecting to the contact surface of the slip-ring with the brush.
Another object of the invention is to provide a feeder arrangement which is easy to manufacture.
According to a main feature of the invention, the improved air passage of the feeder arrangement is formed between a brush holder and a slip-ring cover. A partition member extends from the slip-ring cover and is inserted in an air chamber of the brush holder, forming a U-shaped air passage having an air outlet portion connecting to the outside of the brush holder and an air inlet portion connecting to the inside of the brush holder. The slip-ring cover preferably has a cylindrical portion enclosing the slip rings, and the partition member extends from the rear end of slip-ring cover. Preferably, the air outlet portion of the inside of the slip ring cover is narrower than the air inlet portion on the outside of the slip ring cover to interrupt water or foreign particles effectively. More specifically, the partition member may have a labyrinth in the air passage. The brush holder may have a tongue at an axial end thereof to shut off water or other foreign particles effectively.


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