Vehicle mounted A.C. generator

Claim 1

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (22) fixedly secured to said shaft and adapted to be excited by an exciting coil (50); a stator core (5) disposed opposite an outer periphery of said rotor core and mounting stator coil (6); an enclosure half (24) enclosing at least a rear portion of the stator coil; a front bracket (26) and a rear bracket (30) sealingly joined together to define a housing supporting said stator core directly and said rotor shaft indirectly through bearings (51, 54); a rectifier (52) for rectifying an output voltage generated by said stator coil; a voltage regulator (53) for regulating an output voltage of said rectifier to a predetermined value; at least one annular coolant passage (32b) formed between said enclosure half of the stator coil and said rear bracket; a branch coolant passage (32c) formed along an end surface of said rear bracket, a coolant inlet port (28) formed in said rear bracket and connected to said annular coolant passage and said branch coolant passage; and a coolant outlet port (29) formed in said rear bracket and connected to said annular coolant passage and said branch coolant passage, said coolant inlet and outlet ports being disposed in a common plane orthogonal to said shaft with an angle between said inlet port and said outlet port being less than 90°, said stator coil, said rectifier and said voltage regulator being cooled by circulating a liquid coolant through said coolant passages.