PARK MECHANISM FOR AUTOMOTIVE TRANSMISSION

摘要

A park mechanism (10) for an automotive transmission having an output shaft comprises a rotatable lock ring structure (22) connected to the output shaft, a non-rotatable lock ring structure (16) positioned in proximity to the rotatable lock ring structure (22), and a pressure mechanism (preferably, including a spring-biased piston (32) within a pressure chamber (33) responsive to application of pressure thereto for moving the non-rotatable lock ring structure (16) to a disengaged position for non-engagement with the rotatable lock ring structure (22), and responsive to the release of pressure therefrom for moving the non-rotatable lock ring structure (16) to an engaged position for engagement with the rotatable lock ring structure (22). Preferably, the rotatable lock ring structure (22) is provided with at least one receptacle or tooth (26), and the non-rotatable lock ring structure (16) is provided with at least one tooth (20) receivable in the receptacle or tooth (26).