US 11,719,320 B2
Driving device and assembling method for driving device
Hiroshi Makino, Chino (JP); and Taketo Honzawa, Tomi (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Nov. 10, 2021, as Appl. No. 17/454,260.
Prior Publication US 2022/0145976 A1, May 12, 2022
Int. Cl. F16H 49/00 (2006.01); B25J 9/10 (2006.01)
CPC F16H 49/001 (2013.01) [B25J 9/1025 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A driving device comprising:
a motor including a shaft;
a wave gear device including a wave generator having first thickness in an axial direction of the shaft, a flex spline configured to be flexurally deformed along an outer circumference of the wave generator, and a circular spline configured to interlock with rotation of the wave generator via the flex spline and having thickness larger than the first thickness in the axial direction of the shaft;
at least one intervening member functioning as a housing of the motor and including a flange for fixing a part of the circular spline; and
an oil seal fixed to an inner side of the flange and extending along an outer circumference of the shaft, wherein
when viewed from a perpendicular direction with respect to an axis of the shaft in a cross section including the axis, the wave generator is set closer to an opposite direction of the flange to configure an internal space with the shaft, the wave generator fixed to the shaft, the flex spline, the circular spline, the flange, and the oil seal, and
the internal space is filled with grease and, then, a distance between the oil seal and the wave generator is set smaller than distances among other members in the axial direction of the shaft.