VEHICLE AC GENERATOR

摘要

Provided is a vehicle AC generator having a retainer attached on a bearing containing portion of a front bracket, thereby realizing temperature reduction in a bearing without deteriorating the cooling performance as a whole. In the vehicle AC generator, a front bracket 2 has a bearing containing portion 21 supporting a bearing 5 fitted therein, and an air inlet 22 that is provided along the outer circumference of the bearing containing portion 21 and allows cooling air from a fan 83 to pass therethrough. In addition, a retainer 15 is attached on the bearing containing portion 21, so as to cover the bearing 5. The retainer 15 has a planar shape, and has a fin 15b as a surface area increasing portion for increasing an area of contact with the cooling air, formed at a position facing to and outside the air inlet 22 in the shaft direction.

主权项

1. A vehicle AC generator comprising:
a stator; a front bracket and a rear bracket holding the stator therebetween; a rotor fixed on a shaft supported by the front bracket and the rear bracket via a bearing; and a fan provided at least on a front side of the rotor, wherein the front bracket has a bearing containing portion supporting the bearing fitted therein, and an air inlet that is provided along the outer circumference of the bearing containing portion and allows cooling air from the fan to pass therethrough, a retainer is attached on the bearing containing portion, so as to cover the bearing, and the retainer has a planar shape, and has a surface area increasing portion for increasing an area of contact with the cooling air, the surface area increasing portion being formed at a position facing to and outside the air inlet in the shaft direction.