Multi-stage gearing e.g. for automobile setting element, has planetary wheel drive combined with harmonic drive

摘要

The gearing (7) has a planetary wheel drive (8) on the input side and a harmonic drive (10) on the output side, provided by an oscillation generator (26) with at least one roller (27), which circulates around the gearing axis (21) together with the planetary wheel carrier (22) and contacts a flexband (28) on the inside of a fixed support ring (29). The planetary wheels (24) have associated splines (25) cooperating with a toothed support disc (18), the rollers and the planetary wheels circulating within a dished ring (32) having an edge which acts as the flexband.