| 摘要 |
A wave gear device does not need to be lubricated. In a cup-shaped wave gear device 1, the inner ring 43 and balls 45 of the wave bearing 42 of the wave generator 4 are made of a ceramic material, while the outer ring 44 of the wave bearing 42 is made of SUJ2 or stainless steel. A DLC coating 302 is formed by a DLC coating process on a rolling surface 48 formed in the inner circumferential surface of the outer ring 44, a DLC coating 303 is formed by a DLC coating process on a rolling surface 47 in the outer circumferential surface of the inner ring 43, and DLC coatings 304 are formed by a DLC coating process on the surfaces of the balls 45. With this, non-lubricated wave gear device can be obtained. Since the agitating resistance of a lubricant can also be eradicated from these parts of the wave bearing, a large decrease can be made in the power loss ratio.
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