| 摘要 |
A pressure coupling for securing a part to a shaft rotatable about and centered on the axis has an inner sleeve fitted snugly over the shaft and in good contact therewith and having a pair of axially outwardly flared frustoconical outer surfaces centered on the axis. An outer piston ring and a separate outer cylinder ring on the sleeve respectively have outwardly flared frustoconical inner surfaces flatly engaging the outer surfaces and axially limitedly slidable thereon. The rings are displaceable axially relative to each other between juxtaposed inner positions relatively close to each other and bearing at most lightly on the outer surfaces and spaced-apart outer positions bearing strongly on the outer surfaces and radially inwardly deforming the sleeve against the shaft. The cylinder ring overreaches the piston ring and forms therewith a substantially closed pressurizable chamber. One of the rings is formed with a passage having one end at the chamber and another end and one of the rings is rotationally secured to the part. The inner and outer surfaces have half angles slightly bigger than their respective friction angles, normally above 8 DEG . The chamber can be pressurized to urge the rings into the outer positions, and a locking element is engageable between the rings for locking same in the outer positions. |
