Patent ID: 6830215
Filing Date: 2004-12-14
Classification: B64C,F16C,F16H,Y10T

Abstract:
A pivoting power transmission unit for transmitting rotational drive to at least one driven component configured to revolve about an axis of rotation and configured to be swivelled about a pivot axis substantially perpendicular to said axis of rotation, said transmission unit comprising a casing mounted so as to pivot relative to two stationary and rigid side parts of a support by two coaxial bearings about said pivot axis and spaced at a distance from each other along the pivot axis, wherein the two bearings are plain bearings, each of which comprises:a stationary part integral with one respectively of the two side parts of said support, and comprising a substantially cylindrical sleeve; a swivelling part integral with said pivoting casing and comprising a substantially cylindrical annular trunnion mounted so as to swivel about said sleeve of the stationary part of said bearing; and a wear take-up ring, based on a material with a low coefficient of friction, and comprising a cylindrical tubular part held axially between said sleeve of said stationary part and said trunnion of said moving part, and a radial collar projecting radially outwards from said tubular part and relative to its axis, and integral with one axial end of said tubular part which faces towards the respective side part of the support; and wherein the transmission unit further comprises a device to take up play along the pivot axis, associated with at least one bearing so as to push the wear take-up ring and swivelling part of its corresponding bearing axially away from its respective side part of the support.