Patent ID: 7921977

Claim:
A locking device ( 30 ) for preventing a rotating motion of a shaft ( 14 ) in relation to a housing ( 16 ) of a transmission/drive unit ( 10 ), having a first locking element ( 32 ) and a second locking element ( 34 ) that an electromagnet ( 44 ) and at least one return element ( 42 ) are able to move axially in relation to the first locking element ( 32 ) in order to produce a rotationally fixed connection between the first and second locking elements ( 32 , 34 ), wherein the electromagnet ( 44 ) has an inner pole ( 47 ) that is encompassed by an electric coil ( 45 ), which inner pole ( 47 ) has an axial extension ( 51 ) that extends into a corresponding opening ( 64 ) of the second locking element ( 34 ) in order to produce an axial guidance and centering, and wherein the second locking element ( 34 ) has axial holes ( 81 ) into which axial guide pins ( 79 ), formed onto an axial side ( 87 ) of the electromagnet ( 44 ), extend, the guide pins taper in an axial direction ( 15 ) towards the second locking element ( 34 ) in order to axially guide the second locking element ( 34 ), and the guide pins ( 79 ) are conically embodied at a cone angle ( 77 ) determined so that there is enough play for gear teeth of an axial form-locked engagement ( 85 ) of the two locking elements ( 32 , 34 ) to find each other during the closing process of the locking device.