| 摘要 |
<p>The drive has a helical shaft (32) i.e. hollow shaft, co-operating with a coarse thread with a thread profile of helical slide valves (40). Axial relative motion of the helical slide valves and the helical shaft produced by a drive element (20) i.e. electric motor, are converted by relative rotation of an external pipe (10) and an end fitting (16). The drive element is coaxially arranged in inner side of the external pipe, and the helical shaft and profile are coaxially arranged in the external pipes. The fitting is coaxially mounted at one end of the external pipes.</p> |
