REDUCTION GEAR

摘要

A reduction gear of the present invention is compact and light and can be used for tire portions of an apparatus for travelling, etc. Each of outer and inner pins is formed by a rolling bearing. The reduction gear includes block-shaped lubricating members which supply a lubricant to the outer rings of the outer pins to thereby lubricate them, and a ring-shaped lubricating member which supplies the lubricant to the outer rings of the inner pins to thereby lubricate them. The lubricant can be supplied to a pair of cycloid gears through the outer pins and the inner pins for lubrication. Since the cycloid gears, the outer pins, and the inner pins are lubricated by the lubricating members, the reduction gear can enhance its durability, reduce the friction between components to thereby lower the frictional resistance, and realize a light and compact structure.

主权项

1. A reduction gear comprising:
an input shaft having a pair of eccentric portions which are located adjacent each other in an axial direction of the input shaft and which have a phase difference of 180° therebetween in a circumferential direction of the input shaft; a pair of cycloid gears which rotate in contact with outer circumferences of the corresponding eccentric portions; a hub which is located adjacent to the cycloid gears, rotatably supports the input shaft, and serves as an output shaft; an output shaft pin holder which is fixed to the hub, with the cycloid gears intervening between the output shaft pin holder and the hub, and which rotatably supports the input shaft; a plurality of outer pins which roll on peripheral tooth surfaces of tooth portions of the cycloid gears; an outer pin holder which holds the outer pins such that the outer pins are spaced from one another in the circumferential direction and which rotatably supports the hub and the output shaft pin holder; a plurality of inner pins which roll on wall surfaces of a plurality of insertion holes formed in the cycloid gears and which are supported by the hub; and a plurality of lubricating members which are in contact with the outer pins and the inner pins and lubricate the outer pins and the inner pins.