| 摘要 |
A hydraulic circuit system for one-touch jack and its structure comprises mainly an inlet circuit, a return circuit and an overload protection circuit with a hydraulic cylinder, a piston rod, a sequence valve, a safety valve and a relief valve, in which the inlet circuit extends from an outer reservoir of a hydraulic cylinder via a check valve to connect to an oil chamber of a manual pump, while the oil chamber of the pump is connecting to an oil guide tube via another check valve, the said oil guide tube is inserted to an inner oil chamber formed in a piston rod to form a closed circuit. The oil chamber of the pump is connecting to an inner reservoir of the hydraulic cylinder via a sequence valve and the inner reservoir is connecting to the outer reservoir via a check valve. When the maximum effect capacity of the oil chamber of the pump is greater than or equal to the inner oil chamber of the piston rod, a single touch of the pump can raise the hydraulic jack to the required loading position for raising at no load or light load condition.
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