Rectifier cooling fin arrangement of vehicle AC generator

Details Rectifier cooling fin arrangement of vehicle AC generator Rectifier cooling fin arrangement of vehicle AC generator

1999-10-29

2001-03-06

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

06198188

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei
11-55505,
filed on Mar. 3, 1999, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rectifier cooling fin arrangement of a vehicle AC generator.
2. Description of the Related Art
U.S. Pat. No. 4,419,597 discloses a vehicle AC generator which has a positive and negative cooling fins for cooling a plurality of positive and negative diodes of a rectifier unit. The positive and negative cooling fins are fixed to portions of the frame around a bearing by stud bolts, and, accordingly, the heat of the diodes is conducted to the bearing.
As the output power of the AC generator increases, the heat of the diodes increases to thereby affect the life of the bearing.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved vehicle AC generator that has a cooling arrangement to prevent the above problem.
Another object of the invention is to provide an improved rectifier unit that can be cooled effectively thereby to prevent temperature rise of a rotor supporting bearing.
According to a preferred embodiment of the invention, a vehicle AC generator includes a pair of front and rear frames fastened by a plurality of stud bolts at peripheral portions thereof, a stator having a multi-phase armature winding supported by the pair of frames, a rotor disposed inside the stator, a rectifier unit having a positive cooling fin, a negative cooling fin and a connection member. The positive cooling fin is fastened by the plurality of stud bolts together with the front and rear frames separate from the negative cooling fin, and the connection member is disposed between the positive cooling fin and the negative cooling fin to insulate and hold the positive and negative cooling fins. The negative cooling fin is preferably fastened to the rear frame by a plurality of stud bolts disposed at portions radially outer side of the positive cooling fin.


REFERENCES:
patent: 4419597 (1983-12-01), Shiga et al.
patent: 4952829 (1990-08-01), Armbruster et al.
patent: 5013948 (1991-05-01), Tumpey et al.

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