摘要:
A heat sink capable of securing an excellent cooling performance and having a high mass producibility, and an alternating-current generator for vehicles, adapted to minimize a temperature rise ina diode and a stator of a rectifier and capable of being driven stably. The heat sink is a die casting which comprises a substantially rectangular, flat base (41) one surface of which is used as a heating part mounting surface and a plurality of fins (42) projecting perpendicularly from the other surface of the base (41) so as to be arranged in the lengthwise direction of the base with a pitch (P) and which has a height (H) as measured from the base of at least five times as large as a thickness (T) of each fin. Each fin (42) has a configuration wherein the thickness (T), height (H) and pitch (P) thereof satisfy the conditions of T
摘要:
An alternating current generator for vehicles, which is directed to decreasing sound pressure of cooling air and enhancing a cooling effect, comprising a casing composed of a pair of facing brackets each having a bracket body provided with an exhaust port rib forming a plurality of exhaust ports, and a plurality of suction port ribs disposed inside the exhaust ports and forming a plurality of suction ports, wherein at least one of the brackets has its exhaust port rib inclined 20 DEG to 50 DEG in the direction of rotating of a rotor with respect to a radial line from a rotating shaft, and has a rib thickness of at most 50 % of the width of the exhaust ports on the normal surface in the direction of inclination of the exhaust port rib.