Patent ID: 8012063
Filing Date: 2011-09-06
Classification: F16H,Y10T

Abstract:
1. A device for initiating in a transmission a park mode of operation and an out of park mode of operation, the device comprising: a housing that defines a cavity; a piston slidably disposed within the cavity and moveable between a first position and a second position, the piston having a first face and a second face; a first chamber defined by the housing and the first face of the piston; a second chamber defined by the housing and the second face of the piston; a first fluid port in communication with the first chamber; a second fluid port in communication with the second chamber; and a biasing member disposed within the housing and in contact with the piston, a valve in direct communication with the first fluid port and the second fluid port and operable to selectively provide a pressurized fluid to the first fluid port and the second fluid port, and wherein when a pressurized fluid enters the first chamber from the first fluid port the piston is moved to the first position to shift the transmission into the park mode of operation and the valve provides fluid communication between the second fluid port and a vent port in order to vent a fluid from the second chamber when the park mode of operation is selected, and wherein when a pressurized fluid enters the second chamber from the second fluid port the piston is moved to the second position to shift the transmission into the out of park mode of operation and the valve provides fluid communication between the first fluid port and the vent port in order to vent a fluid from the first chamber when the out of park mode of operation is selected.