Hydraulic circuit

Motors: expansible chamber type – With motive fluid valve – Plural separately controlled waste passages for single...

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91508, 60420, F15B 1108

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active

053236874

ABSTRACT:
A hydraulic circuit for a backhoe loader having two double-acting cylinders for the arm and bucket of the loader and respective directional valves for the cylinders. There are heavy demands on the oil pump of the system when the two cylinders are moved simultaneously from one extreme position to another which requires substantially two whole cylinder volumes of oil. The cylinders are arranged in parallel relative to the pump. A first source of pressure medium displaced from one cylinder is used to perform work in the other cylinder and the other cylinder is also supplied with a second source of pressure medium directly from a pump. The line section through which the first source of pressure medium is supplied is shunted to a tank by valving apparatus upon a predetermined pressure being reached to freely accommodate the simultaneous movements of the cylinders.

REFERENCES:
patent: 3922954 (1975-12-01), Gustafsson et al.
patent: 3976097 (1976-08-01), Brakel
patent: 3982469 (1976-09-01), Bianghetta
patent: 4179981 (1979-12-01), Yeou
patent: 4391181 (1983-07-01), Weirich et al.
patent: 4825748 (1989-05-01), Sheng
patent: 5138837 (1992-08-01), Obertrifter et al.

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