| 摘要 |
The pump has a pump shaft rotated by a motor e.g. electric motor, around a fixed axis with respect to a frame. An eccentric sleeve (4) is engaged with the pump shaft. A stage of pistons is fixed relative to the frame and radially extended in pump cylinders defining chambers. The cylinders have a tappet (8) i.e. cylindrical finger, received in a recess (9) formed in the sleeve and cooperated with a helical spring (10). The spring possesses a resilience varying according to a load of downstream circuit emerging at chambers. The tappet actuates a decreasing unit of stroke of the pistons. |
