Automotive alternator having cooling-air-intake-window...

Details Automotive alternator having cooling-air-intake-window... Automotive alternator having cooling-air-intake-window...

2006-10-17

2006-10-17

Tamai, Karl (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S059000, C310S062000, C310S051000, C415S119000

Reexamination Certificate

active

07122927

ABSTRACT:
A stator having an armature winding and a rotor having a field winding are contained in an alternator housing. A cooling fan is connected to at least one axial end of the rotor, and a plurality of windows are formed in an axial end wall of the housing to face the cooling fan. A shroud surface facing the cooling fan is formed at a radial outside of each window. The opening of the window is so made that it gradually decreases along a rotational direction of the cooling fan, while the shroud surface area gradually increases along the same direction. In this manner, pressure changes in a space between the fan blades and the fan shroud are smoothened, and thereby noises generated by the cooling fan are effectively reduced.

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