To provide an oscillation inner gearing gear reducer reducing mechanical noise and maintaining lubrication performance of a bearing part or the like satisfactory by reducing a so called drift of grease.
The oscillation inner gearing gear reducer 100 including external gears 126, 128, and an internal gear 136 provided with a plurality of external pins 140 at internal teeth I1, I2, ..., internally gearing with external teeth M1, V1, M2, V2, ..., of the external gears 126, 128, includes a support part 136b formed at axial direction both ends of a main body of the internal gear 136 for supporting both ends of the external pin 140, and a sound absorbing member 160 disposed between the support parts 136b and disposed in a clearance between at least part of the external pins 140 out of the plurality of the external pins 140.
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Satoshi Takaya
Keisuke Matsuyama