Patent ID: 8161837

Claim:
An emergency release device for manual actuation of a parking lock of a shift-by-wire gear-change transmission, the transmission being housed within a transmission housing ( 1 ), the emergency release device comprising: a mechanical transfer device ( 7 ) located between an emergency release actuator and the transmission such that the mechanical transfer device ( 7 ) engages with a pivoting lever mechanism ( 3 ), arranged on a transmission shifting shaft ( 2 ) of the transmission, the pivoting lever mechanism ( 3 ) comprising a primary pivoting lever ( 4 ) that is directly connected to the mechanical transfer device ( 7 ), a secondary pivoting lever ( 5 ) that is rotationally fixed to the transmission shifting shaft ( 2 ) and a unidirectional coupling element ( 8 ) that is fixed to the secondary pivoting lever ( 5 ), the primary pivoting lever ( 4 ) and the secondary pivoting ( 5 ) being located on an exterior side of the transmission housing; the primary pivoting lever ( 4 ) and the secondary pivoting lever ( 5 ) are coaxially supported on the transmission shifting shaft ( 2 ) and the unidirectional coupling element ( 8 ) is fixed to and extends axially from the secondary pivoting lever ( 5 ) such that the secondary pivoting lever ( 5 ) couples the primary pivoting lever ( 4 ) via the unidirectional coupling element ( 8 ) when the primary pivoting lever ( 4 ) is actuated, and the secondary pivoting lever ( 5 ) is decoupled from the primary pivoting lever ( 4 ) when only the secondary pivoting lever ( 5 ) is actuated; and a spring ( 6 ) is supported by the transmission shifting shaft ( 2 ) axially between the primary and the secondary pivoting levers ( 4 , 5 ), the spring ( 6 ) contacts a housing abutment ( 12 ), which is fixed to the transmission housing ( 1 ), and communicates with the primary pivoting lever ( 4 ) to bias the primary pivoting lever ( 4 ) into a rest position abutting the housing abutment ( 12 ).