Patent ID: 6344009
Filing Date: 2002-02-05
Classification: F16H

Abstract:
A backlash-free friction gear comprising a housing (12), an annular wheel (8) rotationally rigidly mounted to the housing (12), the annular wheel having a rim (16) which has an inner first running surface (7), said first running surface (7) being cylindrical in an unloaded state, a first shaft (9) rotationally supported in the housing (12) coaxial to the annular wheel (8), to which said first shaft a planetary carrier (6) is mounted, multiple planetary wheels (3) rotationally supported on the planetary carrier (6), a second shaft (1) rotationally mounted coaxial to the first shaft (9), onto which said second shaft a sun wheel (2) with a second cylindrical running surface (21) is mounted, wherein the planetary wheels (3) roll on the first and second cylindrical running surfaces (7, 21), wherein a diameter of the first cylindrical running surface (7) is smaller in the unassembled state than the sum of the diameter of the second cylindrical running surface (21) and the double of the diameter of the planetary wheels (3), wherein rotational axles (5) of the planetary wheels (3) are held rigidly and backlash-free free in the planetary carrier (6) in the circumferential direction of the planetary carrier (6) and flexibly in the radial direction,wherein the planetary axles (5) are rigidly connected to the planetary carrier via bending joints (14) in circumferential direction of the planetary carrier (6), and wherein each planetary axle (5) is arranged in a bearing carrier (13) which is connected at two opposite sides via two struts (15) each to a planetary carrier base body (19), wherein all said struts (15) of one and the same said bearing carrier (13) are parallel to one another.