Patent ID: 7922592
Filing Date: 2011-04-12
Classification: F16C,F16D

Abstract:
1. A longitudinal displacement unit for a driveshaft comprising: a first shaft element defining a longitudinal axis, the first shaft element including an outer face having a plurality of first grooves provided therein that extend parallel to the longitudinal axis and are circumferentially distributed in the outer face; a second shaft element having a through-bore that extends along the longitudinal axis and that receives the first shaft element, the second shaft element having a plurality of second grooves provided in the through-bore opposite the first plurality of grooves and that extend parallel to the longitudinal axis and are circumferentially distributed; a sleeve-shaped cage that is disposed between the first shaft element and the second shaft element and that guides rolling contact members that engage the first plurality of grooves and the second plurality of grooves, wherein the cage is provided with through-apertures that are circumferentially distributed and extend parallel to the longitudinal axis and that include longitudinal ends; and a pressure spring disposed within each of the through-apertures, wherein the first shaft element and the second shaft element are longitudinally movable relative to one another through a first range, wherein the first shaft element and the second shaft element are not loaded by the pressure springs, and through a second range, wherein the first shaft element and the second shaft element are loaded by the pressure springs.