Automatic Transmission/Transaxle: Description and Operation

PARKING MECHANISM





When the selector lever is moved to park position, the parking pawl engages the parking gear of the output shell, locking the output gear and preventing rotation of the driving wheel.

Construction
Only in park position does the parking pawl engage the parking gear via the parking pawl shaft. In the other ranges it is the return spring which holds the parking pawl away from the parking gear. The parking rod slides on the support actuator and is connected to the manual plate via parking assist lever.

Operation
When the selector lever is moved to park position, the manual shaft and manual plate rotate clockwise to the piston shown in the figure, Following this, the parking rod moves in th6 direction indicated by the arrow with the help of the parking assist lever, with the result that the cam of the parking rod pushes the parking pawl upward, allowing the parking pawl to engage the parking gear. If the parking pawl hits the tooth of the parking gear, only the parking rod will be able to move because the parking pawl cannot be raised up. The parking rod cam will press the spring onto the parking pawl and the actuator support. If the vehicle runs under this condition, the wheels will rotate, and the parking gear will also rotate slightly. As a result, the parking pawl slides into the groove, and engages the parking gear.