The invention discloses a manual variable oil pump. The manual variable oil pump comprises a pump case, an oil inlet, an oil outlet, a one-way valve, a piston group and an overflow valve, wherein the piston group comprises a first piston and a second piston, the overflow valve is used for adjusting input pressure and output flow and comprises a pressure sampling end and an overflow passage, the overflow passage is communicated with an oil chamber of the first piston, and the pressure sampling end is communicated with the oil outlet. When output oil pressure exceeds a set numerical value of the overflow valve, the overflow valve is opened, the overflow passage is communicated with one piston, then, oil is drained, and the supplying of high-pressure oil is stopped, so that the manual variable oil pump is applicable to the operation of increasing output pressure and reducing the input flow of the oil pump; the manual variable oil pump is simple and compact in structure and is easy to manufacture and machine.


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    Title :

    Manual variable oil pump


    Contributors:
    ZHAO YAO (author)

    Publication date :

    2015-04-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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