Lubricant supplying mechanism for a wave gear drive

摘要

A wave gear drive (1) has a silk-hat shaped flexible external gear (12) comprising a cylindrical body (13), a circular diaphragm (14), a circular boss (15) formed integrally on the diaphragm (14), and external teeth (16) formed on the body (13) at a side of an open end (13a) thereof. The boss (13) of the flexible external gear, a cross roller bearing (7) and the rigid internal gear (11) are arranged between first and second end plates (2, 3) so as to define a substantially sealed inside space of the wave gear drive (1). A resilient seal ring member (8) is mounted on the open end (13a) of the flexible external gear to divide the inside space into an inside portion (9) where a first lubricant having a high viscosity is supplied and an outside portion (10) where a second lubricant having a low viscosity is supplied. These lubricants are prevented from being mixed with each other during operation, thus proper lubrication to portions of the teeth (11a, 16) of the gears (11, 12) and to a wave bearing (19) of the wave generator (17) can be maintained.