AC generator for vehicle

Details AC generator for vehicle AC generator for vehicle

2000-02-25

2001-05-29

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S059000, C310S06000A, C310S06000A

Reexamination Certificate

active

06239518

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to an AC generator for vehicle which is to be driven by an engine of a vehicle and particularly to the technology to cool heating portions of the AC generator.
BACKGROUND OF THE INVENTION
A general AC generator for vehicle comprises a housing in which a stator including stator cores and stator coils wound thereon is fitted, a rotor including a rotary shaft and pole cores fitted thereon, field coils by which the pole cores are magnetized, brackets for supporting the rotor through bearings, a rectifier, and a voltage regulator, the rotor being supported at the neighborhood of opposite ends thereof through the bearings so as to be able to rotate inside the stator. Main heating portions of this type of AC generator for vehicle are the stator cores, stator coils, rectifier, voltage regulator and so on.
An example of cooling means of the AC generator for vehicle is disclosed in JP-A-10-225060. It is disclosed in this publication that the cooling means comprises a first cooling liquid passage through which a cooling liquid is made to flow and which is provided around a stator, e.g. a passage provided in the wall of a housing, and a second cooling liquid passage through which the cooling liquid is made to flow and which is provided around a rectifier and a voltage regulator, e.g. a passage provided in a bracket to which the rectifier and the voltage regulator are to be mounted, the first and second cooling liquid passages being connected in series. It is also disclosed that a third cooling liquid passage is provided in another bracket and connected to the second cooling liquid passage through the first cooling liquid passage.
In the prior art described above, however, the cooling liquid passages are provided separately in the housing, the front bracket and the rear bracket, so that the structure is complicated. This gave rise to the problems of an increase in the mass of parts and a rise in the cost needed for connecting the cooling liquid passages.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an AC generator for vehicle in which a cooling liquid passage simple in structure and easy to assemble is provided and heating portions can be cooled effectively.
In order to achieve the above object, in an AC generator for vehicle according to the invention, a housing enclosing a rotor and a stator is integrally formed therein with a plurality of axial passages through which a liquid is made to flow in the direction of a rotary shaft of the rotor and a passage connecting the axial passages so as to be able to cool heating portions effectively.
According to the invention, the cooling passage can be integrally formed in the housing, and therefore the cooling passage becomes simple in structure and easy to assemble, and the heating portions can be cooled effectively.


REFERENCES:
patent: 3819965 (1974-06-01), Schoendube
patent: 5519269 (1996-05-01), Lindberg
patent: 5616973 (1997-04-01), Khazanov et al.
patent: 5886433 (1999-03-01), Oda et al.
patent: 41 04 740 A1 (1991-08-01), None
patent: 0 589 187 A1 (1994-03-01), None
patent: 2 717 640 (1995-09-01), None
patent: 7-336946 (1995-12-01), None
patent: 10-225060 (1998-08-01), None
patent: WO 97/44882 (1997-11-01), None

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