Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1983-06-23
1986-02-18
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60484, 60486, 180 648, F15B 1309, F16H 3946
Patent
active
045704414
ABSTRACT:
A control system for a hydraulic vehicle having a pair of bidirectional travel motors driven by respective pumps via respective travel valves, and implement actuators, including a swing motor, driven by the pumps via two parallel connections of pilot-operated implement valves. For making possible the straight travel of the vehicle, either forwardly or rearwardly, while any of the implement actuators is being driven by either pump, a straight travel valve is provided for the on-off control of communication between the forward travel ports, and between the rearward travel ports, of the two travel motors. Normally held closed under spring pressure, the straight travel valve is pilot opened by a series connection of two straight travel control valves, which delivers pilot control fluid to the straight travel valve when the travel valves are both hand operated to set the two travel motors into rotation in the same direction. The straight travel control valves receive the pilot control fluid from implement control valves provided for the pilot actuation of the implement valves. Thus the two travel motors when set into rotation in the same direction are driven by the combined power fluid from the two pumps if then any of the implement control valves is being operated for activating the corresponding implement actuator or actuators.
REFERENCES:
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patent: 4030623 (1977-06-01), Bridwell et al.
patent: 4055046 (1977-10-01), Schexnayder
patent: 4324098 (1982-04-01), Aruga et al.
patent: 4376371 (1983-03-01), Kojima et al.
patent: 4431365 (1984-02-01), Sturtz, Jr.
Murakami Takashi
Yoshida Kazuhiro
Garrett Robert E.
Husar John M.
Kabushiki Kaisha Komatsu Seisakusho
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