| 摘要 |
A vane pump wherein an annular slide block which surrounds the vanes of the rotor is movable radially of the rotor axis by two plungers which are mounted in the housing diametrically opposite each other. An arresting plug abuts against the slide block midway between the plungers at the higher-pressure side of the rotor and has a flat or spherical contact surface engaging the external surface of the slide block. The outer end of the plug has a socket for the major portion of a ball which bears against the concave surface of an abutment mounted in a recess of a screw which meshes with the housing and is movable radially of the rotor. The radius of curvature of the concave surface exceeds the radius of the ball and the radius of curvature of the contact surface, as considered in the direction of adjustment of the slide block by the plungers, exceeds the distance from the locus of contact between the ball and abutment to the locus of contact between the plug and slide block. This insures that the external surface of the slide block rolls along the contact surface and does not slide with respect to the plungers when the slide block is shifted by the plungers whereby the amount of fluid which is displaced by the vanes can be changed without vibrations and/or hysteresis. Adjustments of the screw relative to the housing serve to change the noise level of the pump.
|
