Patent ID: 8801525
Filing Date: 2014-08-12
Classification: B62D,F16C,F16D

Abstract:
1. Telescopic shaft for motor vehicles, which comprises: an inner shaft with a length axis, an outer shaft with a length axis, which defines a tube and surrounds a part of the inner shaft and which is movable in the axial direction in relation to the inner shaft, two ball tracks arranged in the inner shaft, and balls arranged in the ball tracks, wherein the inner shaft is arranged so that turning of the inner shaft in relation to the outer shaft is prevented, wherein each one of the ball tracks comprises an outer ball track portion and an inner ball track portion for returning the balls to the outer ball track portion, wherein the outer ball track portion is partly open so that the balls which are arranged in the outer ball track portion are arranged to roll between the outer ball track portion and the inside of the outer shaft when the inner shaft is moved axially in relation to the outer shaft, wherein the telescopic shaft comprises a ball holding member which is arranged fixed on the inner shaft, in which ball holding member the inner ball track portions and the outer ball track portions are arranged, at least one end cover which connects the inner ball track portions and the outer ball track portions in one end of the ball holding member along the length axis, at least one movable ball track member which constitutes at least a part of the outer ball track portion and a spring member which is arranged between the inner shaft and the movable ball track member, which spring member is arranged to press the movable ball track member and the balls arranged in the ball track member against the inside of the outer shaft, in order to pretension the telescopic shaft.