Patent ID: 9205813
Filing Date: 2015-12-08
Classification: B60T,F16H

Abstract:
1. A parking lock device for a transmission including: a parking gear; a parking pawl configured to be lockable when in mesh with the parking gear; a hydraulic pressure generating source configured to generate line pressure; a hydraulic actuator configured to operate the parking pawl into a lock position and an unlock position by use of the line pressure; and a manual release device for manually operating the parking pawl into the unlock position, wherein the hydraulic actuator includes an unlock oil chamber at one end, and a lock oil chamber at the other end, the line pressure is transmitted to the unlock oil chamber, the line pressure can be transmitted to the lock oil chamber via a first solenoid valve, hydraulic pressure from an accumulator configured to accumulate the line pressure can be transmitted to the lock oil chamber via a second solenoid valve, a check valve configured to allow oil to flow toward the accumulator only is provided upstream of the accumulator, and an orifice is provided upstream of the accumulator and is connected to the accumulator such that the orifice is in parallel with the check valve.