Patent ID: 7757832

Claim:
A parking lock for a motor vehicle with one of an automatic transmission and a manual automatic transmission, the parking lock ( 1 ) engaging with a parking lock wheel ( 2 ) fixed to a transmission output to prevent rotation of the transmission output, the parking lock comprising: a locking pawl ( 4 ), having a free pivotable end, being pivotably secured to a parking lock bolt ( 3 ) in a transmission housing, the locking pawl pivoting to one of engage and disengage the parking lock wheel ( 2 ), and the free pivotable end ( 5 ) passes through a guiding plate ( 6 ) connected to the transmission housing ( 17 ); a locking element ( 7 ) being sandwiched between the locking pawl ( 4 ) and the guiding plate ( 6 ) to retain engagement between the locking pawl ( 4 ) and a tooth gap of the parking lock wheel ( 2 ) when the parking lock ( 1 ) is engaged; a hydraulic damping element ( 8 ) operatively communicates with the locking pawl ( 4 ), when the parking lock ( 1 ) is disengaged, such that movement of the pivotable end ( 5 ) of the locking pawl ( 4 ) toward the guiding plate ( 6 ) is damped when the parking lock ( 1 ) is disengaged so as to prevent a release jolt, the hydraulic damping element ( 8 ) comprises a piston ( 11 ), which is located in one of a cylinder ( 9 ) and a cylinder bore ( 20 , 22 ) and operatively communicates with the locking pawl ( 4 ) such that movement of the locking pawl ( 4 ), toward the guiding plate ( 6 ), biases the piston ( 11 ) against oil, located within at least one of the cylinder ( 9 ) and the cylinder bore ( 20 , 22 ), the oil being displaced into an oil sump ( 15 ) through a pipe ( 14 ) and an orifice ( 12 ) to restrict the flow of oil to the oil sump ( 15 ) to provide a damping effect on the movement of the locking pawl ( 4 ) toward the guiding plate ( 6 ).