Wolfrom planetary gear transmission with planet gears axially divided into two differently toothed areas

摘要

The invention relates to a Wolfrom planetary gearing with planet gears (7) which are split axially into two areas with different toothing. One (11) of these areas meshes simultaneously with a rotating sun gear (8) and with a fixed internal gear (13), while the second area (12) meshes only in a rotatable internal gear (5). The intention is to configure this gearing in such a way that its operating noise is low, that there is little backlash and that it is small in size. This is particularly important for gearings with a plurality of planet gears distributed around the periphery of the gearing. For this purpose, the two differently toothed areas of the planet gears are cut helically in opposite directions. The opposing helical toothings are on separately produced component planet gears which are combined for operation, giving a unitary planet gear with two areas of toothing. This makes possible simple, efficient manufacture of the opposing helical toothing on a planet gear which forms a single unit in operation. Any manufacturing and assembly tolerances are cancelled out by the self-centring of the opposing parts of the planet gears due to the opposing helical toothing. IMAGE