Abstract: An excitation-type AC generator having stator and field coils cooled by a fluid passing through passageways within the rotating shaft of the rotor. The fluid, either engine oil or outside air, is drawn into a hole in the end of the rotating shaft, transported axially through a passageway in the shaft, then forced radially outward through channels in the rotating shaft into the areas surrounding the field and stator coils, absorbing the heat generated and eliminating any need for an externally mounted centrifugal fan.

Abstract: Disclosed is an improved multi-pin type of water proof electric connector which is guaranteed free of shortcircuit between adjacent pin-and-contact piece connections even if water should invade to any pin-and-connector piece connection through the very small gap between the conductor and the insulation sheath of the wire by the capillary action. The electric connector comprises a male half having contact pieces and a female half having pin terminals in its cavity, and a seal member placed in the space which is to be formed between the outer surface of the plug housing and the inside surface of the socket housing when the male and female halves are coupled. The plug housing has a plurality of hollow protrusions each containing a contact piece, and the seal member encircles each of the protrusions, thereby sealing each pin-and-contact piece connection independently from adjacent pin-and-contact piece connections when the male and female halves are mated.

Abstract: A multipolar connector includes a female connector having a female housing for accommodating and supporting a plurality of first connecting terminals, a male connector having a male housing for accommodating and supporting a plurality of second connecting terminals each connectable to a corresponding one of the first connecting terminals. A seal member is positioned between opposing end faces of the female and male connectors when the female and male connectors are coupled with each other. Overlapping portions are formed between individual connecting terminals on the end faces of the female and male housings opposing through the seal member and overlapping portions are formed on the seal member for intimate contact engagement with the overlapping portions on said female and male housings.