Patent ID: 7441643
Filing Date: 2008-10-28
Classification: F16D,F16H,Y10T

Abstract:
1. A transmission, comprising: a source of pressurized fluid; a low pressure reservoir; a plurality of hydraulically actuated clutches; a first plurality of valve mechanisms, each of the first plurality of valve mechanisms associated with one of the plurality of hydraulically actuated clutches and configured to selectively fill and drain the associated one of the plurality of hydraulically actuated clutches; a second plurality of valve mechanisms, each of the second plurality of valve mechanisms associated with one of the plurality of hydraulically actuated clutches and configured to selectively fill and drain the associated one of the plurality of hydraulically actuated clutches, where the valve mechanisms in the first plurality of valve mechanisms are not in the second plurality of valve mechanisms; and a master latch mechanism in fluid communication with only the second plurality of valve mechanisms, the master latch mechanism configured to selectively affect movement of the second plurality of valve mechanisms in response to an electrical power failure.