A cage is provided to maintain the spacing between the rolling parts of the rolling bearing: rollers, balls, cones, etc. To keep the bearing relative to the shaft or hole, there is a retaining ring or cover and prevent dust falling into the raceway, there is a dust cover. Stable gearbox operating conditions require precise gear engagement, which in turn requires rigid support for the input shaft and the auxiliary shaft.For the light alloy housing gearbox, the positioning support base facilitates precise gear meshing.