Anti-vibration apparatus in a hydraulic system for boom cylinder

Details Anti-vibration apparatus in a hydraulic system for boom cylinder Anti-vibration apparatus in a hydraulic system for boom cylinder

1990-01-09

1991-09-17

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60469, 60492, 91459, F16D 3102

Patent

active

050482963

ABSTRACT:
A working machine such as a hydraulic excavator is provided with a working apparatus including a boom pivotally mounted on the body of the working apparatus and a boom-cylinder hydraulic system for the working apparatus. The hydraulic system includes an actuator for moving the boom up and down and a directional selecting valve. The directional selecting valve is arranged to effect selective switching of the feed of a pressurized working fluid to and the discharge of the working fluid from with respect to the rod-side and the bottom-side hydraulic chamber. The hydraulic system further includes a device for relieving the pressure of the bottom-side hydraulic chamber of the actuator. This relieving device is connected to the bottom-side hydraulic chamber of the actuator via a hydraulic circuit. When the pressure in the bottom-side hydraulic chamber changes from rise to fall, the pressure is released to a low-pressure side of the hydraulic circuit, thereby suppressing oscillation of the boom.

REFERENCES:
patent: 3579987 (1971-05-01), Busse
patent: 4586332 (1986-05-01), Schexnayder
patent: 4718329 (1988-01-01), Nakajema et al.

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