| 摘要 |
The actuator consists of a support (2) with a lengthwise drive rod (8) having a threaded forward end (17) and teeth, a coaxial outer sleeve (39) with an internal thread, and lengthwise rollers (28) between the rod and sleeve. The rollers have threaded outer surfaces engaging with the rod and sleeve threads and teeth engaging with those on the rod. The pitch of the roller threads is the same as that of the rod but different from the thread inside the sleeve, so that the sleeve moves in a lengthwise direction when the rod is rotated by a drive (44) such as an electric motor. |
