Patent ID: 8313411
Filing Date: 2012-11-20
Classification: F16H,Y10T

Abstract:
1. A backlash-free planetary gear unit comprising: a sun gear, an internal gear and at least one planet gear which is in mesh with said sun gear and said internal gear and which is arranged on a planet carrier such that it is rotatable about a planetary axis of rotation, wherein the planet gear has a plane of division which is oriented perpendicular to the planetary axis of rotation and by which the planet gear is divided into a first planet subgear and a second planet subgear, wherein the first planet subgear is preloaded relative to the second planet subgear by a spring bar arranged in these two planet subgears substantially parallel to the planetary axis of rotation, at least one spring bar, which is subject to a bending load and which is supported in the two planet subgears, is arranged around the planetary axis of rotation, wherein the at least one spring bar is arranged in a first recess of the first planet subgear and in a second recess of the second planet subgear, wherein said first and second recesses extend up to and into the area of the plane of division, and wherein the first recess and the second recess are implemented as holes widening towards the plane of division, and wherein, in the direction in which the planet subgears are rotatably displaced relative to one another, the hole widens in a kidney-shaped or fan-shaped manner in the area of the plane of division.