| 摘要 |
<p>An object is to allow smooth guidance of the linear motion of an output member even when lateral moment acts on the output member, and to make it possible to stably transmit torque of a rotary shaft to respective planetary rollers without applying a preload to the planetary rollers by negative gaps between the rollers and the radially outer surface of the rotary shaft and between the rollers and the radially inner surface of an outer race member. The axial movement of a carrier (6) supporting the planetary rollers (7) is restricted, and the outer race member (5) is axially slidably fitted in the radially inner surface of a cylindrical portion (1a) of a housing (1) and is rotationally fixedly coupled to an object to be driven by means of keys (25), whereby the outer race member (5) serves as a linearly driven output member. The planetary rollers (7) have their radially inner surfaces rotatably supported on respective support pins (6c) of the carrier (6), and are radially inwardly biased by radial compression ring springs (21) wound around the support pins (6c) so as to envelop the support pins. The planetary rollers (7) are thus pressed against the radially outer surface of the rotary shaft (4).</p> |
