| 摘要 |
<p>A preload adjusting plug (79) is inserted through a communication hole (67) extending through center portions of a Z1 gear (61), a Z4 gear (62), and an inner ring (65) of a nutation gear (63). A male thread portion (83) is formed at an outer periphery of one end of the preload adjusting plug (79), and is screwed to a female thread portion (84) formed at an inner periphery of the Z1 gear (61). A disc-shaped flange portion (82) extending radially outward is formed at the other end of the preload adjusting plug (79), and axially presses a back face of the Z4 gear (62) through a bearing (81). The preload adjusting plug (79) applies predetermined preloads to meshing portions in the nutation gear mechanism (25).</p> |
