Patents Examined by Frank H. McKenzi, Jr.
  • Shift control mechanism in an automatic transmission for vehicles
    Patent number: 4419910
    Abstract: A planetary gear transmission changing forward and reverse drives for vehicles comprises one wet-type brake, one wet-type clutch and a planetary gear set, and is controlled by one shift control valve and one solenoid valve operated by an electric control circuit. Hydraulic pressure supplied to the wet-type brake and the wet-type clutch is regulated in independent oil chambers respectively, resulting in effects of accurate hydraulic pressure regulation and simple structure without wrong operation.
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: December 13, 1983
    Assignee: Aisin-Warner Kabushiki Kaisha
    Inventors: Nobuaki Miki, Shoji Yokoyama