Patent ID: 8528948

Claim:
Auxiliary locking drive for a motor vehicle lock, comprising: a drive housing constructed for being located separate from the motor vehicle lock in an installed state connected to the motor vehicle lock, a drive arrangement with a drive motor for producing a linear driving motion in the installed state, and a transmission means for drivingly coupling the drive motor to the vehicle lock for transferring the vehicle lock from a half-locked state into a main locked state by the linear driving motion, wherein the drive arrangement, for producing the linear driving motion, comprises a feed gear mechanism which is connected to a drive shaft of the drive motor and wherein the feed gear mechanism comprises spindle-spindle nut gearing with a spindle and a spindle nut, wherein the spindle has a spindle thread and the spindle nut has a spindle nut thread engaging the spindle thread, wherein the spindle is assigned to a driven side of the spindle-spindle nut gearing and the spindle nut is assigned to a drive side of the spindle-spindle nut gearing, wherein the drive motor is connected to drive the spindle nut, wherein the drive arrangement is adapted to convert rotation of the spindle nut into lengthwise motion of the spindle, wherein the spindle is provided with a projection which runs in a lengthwise guide for locking the spindle against rotation while allowing it to move in a lengthwise direction, and wherein the lengthwise guide is arranged within the drive housing.