| 摘要 |
With a wave generator (5) for a flat-type wave gear device (1) a first elliptical outer circumferential face (6S) of a first wave generator section (5S) is defined by a first elliptical curve (C1), and a second elliptical outer circumferential face (6D) of a second wave generator section (5D) is defined by a second elliptical curve (C2). Compared to using a wave generator for which the contour is defined by a single elliptical curve, differences between the ball load distribution of the first wave generator section (5S) and the ball load distribution of the second wave generator section (5D) can be suppressed, both ball load distributions can be equalized, and the equivalent ball load can be reduced; therefore, an increase in the lifespan of the wave generator bearing can be achieved. |
