Hydraulically-operated equipment for construction machinery

Details Hydraulically-operated equipment for construction machinery Hydraulically-operated equipment for construction machinery

1993-12-16

1994-11-22

Look, Edward K.

Power plants

Pressure fluid source and motor

Having means controlling or attenuating shock vibration,...

60325, 60327, F16D 3102, F16D 3300

Patent

active

053657373

ABSTRACT:
Hydraulically-operated equipment such as travelling equipment or working equipment for use in construction machinery such as a power shovel, shoveldozer and bulldozer. The hydraulically-operated equipment comprises a hydraulic driving mechanism actuated by hydraulic pressure, a hydraulic pressure supplying device for supplying hydraulic pressure to a hydraulic pipeline system for the hydraulic driving mechanism and a controller for controlling the hydraulic pressure supplying device such that the supplying rate at which hydraulic pressure is supplied to the hydraulic pipeline system according to the supply of hydraulic pressure is decreased in a specified period after a dead zone period in which hydraulic pressure starts to rise. This arrangement prevents an operational lag in the hydraulic driving mechanism as well as a shock at the time of start-up and shut-down.

REFERENCES:
patent: 3902319 (1975-09-01), Olmsted
patent: 4524582 (1985-06-01), Lucas et al.
patent: 4586330 (1986-05-01), Watanabe et al.
patent: 4753158 (1988-06-01), Hirata et al.
patent: 5029067 (1991-07-01), Nishida et al.
patent: 5048296 (1991-09-01), Sunamura et al.

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