Patent ID: 6925901

Claim:
A device for converting a rotational movement into an axial movement, having a planetary roller ( 7 ) driven by a drive shaft ( 5 ) coming out of a drive mechanism ( 1 ) and held at a uniform distance on the circumference, and having a thrust body ( 3 ) that is axially displaceable by the planetary rollers ( 7 ), whereby the planetary rollers ( 7 ) are secured at the periphery in a support ( 6 ) which is driven about its axis, they are rotationally mounted and provided with peripheral grooves or threaded grooves, the support ( 6 ) is connected in a fixed-torque manner to the drive shaft ( 5 ) which rotates about its axis, the planetary rollers ( 7 ) engage in at least one thread-like groove on the thrust body ( 3 ) which is displaceable along the axis of the support ( 6 ) by way of their peripheral grooves or threaded grooves, the support ( 6 ) drives the planetary rollers ( 7 ), the thrust body ( 3 ) is a hollow body which encloses the planetary rollers ( 7 ), at the center of the support ( 6 ) concentrically inside the planetary rollers ( 7 ), a bearing body ( 9 ) is provided; it can rotate independently of the drive shaft ( 5 ) about its axis, having an area of peripheral bearing grooves ( 11 ) or threaded grooves, said bearing grooves ( 11 ) or threaded grooves engaging in respective peripheral grooves or threaded grooves on the planetary rollers ( 7 ), wherein the bearing body ( 9 ) is tubular and is rotatably mounted and is axially secured at one end relative to the drive mechanism ( 1 ), for a torque-fixed connection of the support ( 6 ) to the drive shaft ( 5 ), an area of the support ( 6 ) which a shaft ( 8 ) fixedly connected to this support ( 6 ), passes through the center of the bearing body ( 9 ) and said shaft ( 8 ) rotates on bearings ( 12 ) located between said shaft ( 8 ) and said support ( 6 ).