Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1981-10-09
1984-09-25
Cohen, Irwin C.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
60421, 91 28, 91 31, 91514, F15B 1116, F15B 1306
Patent
active
044730900
ABSTRACT:
All but the circle drive motor of the implement actuators of a motor grader are divided into two groups each consisting of those which need not be operated simultaneously. The power system has three fixed displacement pumps for driving the circle drive motor via a circle control valve and the two implement actuator groups via respective implement control valve arrangements of carry-over parallel configurations. One of the pumps is connected to the two implement control valve arrangements via a restriction and a flow divider. A first demand valve controls communication between the other two pumps and the implement control valve arrangements in response to the pressure differential across the restriction, maintaining constant fluid flow to the valve arrangements regardless of engine speed or the loads on the implement actuators. A second demand valve likewise responds to a pressure differential across another restriction formed in a conduit communicating the first demand valve and the carry-over ports of the implement control valve arrangements with the circle control valve, maintaining constant fluid flow thereto.
REFERENCES:
patent: 2643516 (1953-06-01), Carlson
patent: 2879612 (1959-03-01), Schultz et al.
patent: 3410295 (1968-11-01), Malott
patent: 3455210 (1969-07-01), Allen
patent: 3535877 (1970-10-01), Becker et al.
patent: 3662548 (1972-05-01), Suzuki et al.
patent: 4044786 (1977-08-01), Yip
Shirai Kiyoshi
Uehara Kazuo
Cohen Irwin C.
Kabushiki Kaisha Komatsu Seisakusho
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