| 摘要 |
Positive displacement vacuum pump is provided with a pump body, and a piston is positioned in the pump body with the piston being mounted for actuation by alternative linear movement. An elastic element biases the piston in a first direction, and a cam acts on a first end of the piston, with the cam being rotatably movable along an axis that is coaxial with the longitudinal axis of the piston to drive the piston in an alternating linear movement. A transverse bar is positioned between a first end of the piston and the cam, and the transverse bar is rotatably fixed but translationally guided in the direction of alternative linear movement of the piston. Additionally, the cam comprises a double surface to equally bias the transverse bar at two positions along the length of the bar.
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