Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1987-01-26
1988-09-06
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60428, 91 6, 91513, F15B 1308
Patent
active
047683392
ABSTRACT:
A hydraulic drive system for a construction machine in which a hydraulic circuit has at least one hydraulic pump, at least first and second hydraulic actuators driven by a hydraulic fluid discharged from the pump, and at least first and second directional control valves connected to the pump in parallel with each other for controlling flows of hydraulic fluid supplied from the pump to the first and second actuators, respectively, and a control unit is responsive to first and second operation signals for driving the first and second actuators, respectively, to produce first and second control signals for actuating the first and second valves and deliver such control signals thereto, respectively, each of the first and second valves having a degree of opening changed in accordance with a level of the corresponding one of the first and second control signals for controlling a flow rate of hydraulic fluid supplied to the corresponding one of the first and second actuators. The control unit includes restriction means for restricting the level of the first control signal for restriction of the degree of opening of the first directional control valve when both of the first and second operation signals are entered in the control unit for instruction to perform simultaneous driving of the first and second hydraulic actuators.
REFERENCES:
patent: 4561824 (1985-12-01), Okabe et al.
patent: 4586330 (1986-05-01), Watanabe et al.
Aoyagi Yukio
Ichiyama Shuichi
Uno Keiichiro
Yasuda Tomohiko
Hitachi Construction Machinery Co. Ltd.
Michalsky Gerald A.
LandOfFree
Hydraulic drive system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic drive system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic drive system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1599527