Method of controlling swing motion of a revolving superstructure

Details Method of controlling swing motion of a revolving superstructure Method of controlling swing motion of a revolving superstructure

1989-07-26

1991-11-12

Kwon, John T.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60468, 60494, E02F 912, E02F 920, E02F 922, E02F 332

Patent

active

050637428

ABSTRACT:
A method of controlling the slewing of a revolving superstructure of a hydraulic backhoe includes setting a swing mode selector valve in a driving position to supply fluid discharged from a pump through a supply-and-discharge line to a hydraulic motor to drive the hydraulic motor for a driving operation, setting one of a pair of relief valves provided between the swing mode selector valve and the hydraulic motor, associated with the supply side of the hydraulic motor for a set relief pressure higher than the set relief pressure of a main relief valve for limiting the pressure in supply-and-discharge lines to the set relief pressure of the main relief valve while the hydraulic motor is operating in a driving mode, and setting the other relief valve associated with the discharge side of the hydraulic motor for a set relief pressure lower than the set relief pressure of the main relief valve to limit the pressure in the supply-and-discharge line associated with the discharge side of the hydraulic motor to the set relief pressure of the other relief valve while the hydraulic motor is operating in a braking mode. The method brakes the slewing mechanism smoothly to prevent the rapid abrasion of the braking surfaces of the components of the slewing mechanism.

REFERENCES:
patent: 3125324 (1964-03-01), Vivier
patent: 4481770 (1984-11-01), Lohbauer et al.
patent: 4548036 (1985-10-01), Matsuda et al.
patent: 4628690 (1986-12-01), Arai et al.
patent: 4845948 (1989-07-01), Tha et al.

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