Patent ID: 8887498
Filing Date: 2014-11-18
Classification: F15B,F16H,Y10T

Abstract:
1. A system for providing pressurized hydraulic fluid to a hydraulic control in a transmission of a motor vehicle, the system comprising: a pump for providing the pressurized hydraulic fluid; a control device for selectively communicating the pressurized hydraulic fluid to the hydraulic control; a first one-way device configured to communicate pressurized hydraulic fluid flow from the pump and to prevent pressurized hydraulic fluid flow to the pump; a bypass valve assembly having a bore that defines an inlet port in communication with the first one-way device and an outlet port, the bypass valve assembly having a ring seal disposed circumferentially around the inlet port and a member moveable between at least a first position and a second position, wherein the member is sealed to the bore by a second ring seal when in both the first and second positions and the member includes a first end surface that contacts the ring seal when the member is in the first position to hydraulically isolate the inlet port of the bypass valve assembly from the outlet port of the bypass valve assembly and wherein the first end surface does not contact the ring seal when the member is in the second position to allow the inlet port of the bypass valve assembly to communicate with the outlet port of the bypass valve assembly, and wherein the member is biased to the first position by a force acting on the member due to a biasing member; an accumulator in communication with the outlet port of the bypass valve assembly; a second one-way device configured to communicate pressurized hydraulic fluid flow from the accumulator and to prevent pressurized hydraulic fluid flow to the accumulator; wherein the accumulator is charged when the control device is closed and the member is moved to the second position from the first position when a force acting on the first end surface of the member due to the pressurized hydraulic fluid at the inlet port of the bypass valve assembly exceeds the force acting on the member due to the biasing member.