Patent ID: 7048658

Claim:
A device for converting a rotational movement into an axial movement with driven planetary rollers ( 10 ) kept at the same distance peripherally, and with a sliding body ( 5 ) axially displaceable by the planetary rollers ( 10 ), comprising (a) the planetary rollers ( 10 ) are fixed axially in a rotating carrier ( 9 ) are rotationally mounted and provided with grooves ( 11 ), (b) the planetary rollers ( 10 ) are threadably engaged with the sliding body ( 5 ) and displaceable along the axis of the carrier ( 9 ), (c) the sliding body ( 5 ) is a hollow body enclosing the planetary rollers ( 10 ), (d) an axially attached bearing body ( 7 ) rotating about its axis, is provided in the center of the carrier ( 9 ) radially inside the planetary rollers ( 10 ), (e) the grooves ( 11 ) of the planetary rollers ( 10 ) and the grooves ( 12 ) of the bearing body ( 7 ) have a mutually adapted gradient, (f) the planetary rollers ( 10 ) and the bearing body ( 7 ) are geared with one another ensuring freedom from slip via a toothed region ( 14 ), (g) the carrier ( 9 ) and the bearing body ( 7 ) are driven in rotational relationship, ensuring freedom from slip between the planetary rollers ( 10 ) and the sliding body ( 5 ) whereby the carrier ( 9 ) and the bearing body ( 7 ) are driven by a common drive shaft ( 8 ), and (h) the drive shaft ( 8 ) has a region acting as a sun wheel and the drive shaft ( 8 ) drives the carrier ( 9 ) with a planetary toothed gearing having planetary toothed wheels ( 18 ) in a hollow toothed wheel ( 19 ) fixed relative to the drive shaft ( 8 ).