PLANETARY CYCLOIDAL REDUCTION GEAR WITH PRELIMINARY STAGE

摘要

FIELD: machine building.;SUBSTANCE: invention refers to planetary gear transmissions with a central transmission axis lying inside the main circle of a planetary wheel. A planetary cycloidal reduction gear includes high-speed shaft (2), an internal engagement wheel, the rim of which is formed with rollers (17), a cycloidal stage with cycloidal disc (9) provided on its outer surface with cycloidal teeth (10) for engagement with rollers (17). Rotation of disc (9) around its axis is transmitted to the high-speed shaft of the reduction gear by means of pins with rollers (13) running-in holes (14) in the cycloidal disc. On inner surface of the cycloidal disc there is internal engagement wheel (8). The preliminary planetary stage is located in the cycloidal disc plane and inside it. The preliminary stage includes input gear (4) connected to high-speed shaft (2) and three satellites put on free carrier (5). One satellite (6) is in simultaneous engagement with input gear (4) and internal engagement wheel (8) and has the size that provides eccentric fit of the same disc relative to the reduction gear axis. Other satellites (16) have smaller dimensions and are engaged only with internal engagement wheel (8).;EFFECT: invention is aimed at increase in transfer ratio at maintaining overall dimensions of the reduction gear and reduction of cantilever loads of the reduction gear.;3 cl, 6 dwg