Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1988-10-28
1990-06-26
Look, Edward K.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60464, 60468, 60487, 60488, F16D 3102
Patent
active
049360957
ABSTRACT:
An improved closed-loop hydrostatic transmission system is provided of the type including a pump (11), a motor (13), and a pair of conduits (15 and 17). The system includes a main control valve (43) and a charge pump (23) which is the sole source of make-up fluid to the closed-loop system and the sole source of control fluid for varying the pump. The system includes a power limiting means comprising first and second pressure relief valve means (75 and 77) operable to provide fluid communication from whichever side of the closed-loop is at high pressure to the system reservoir whenever system pressure exceeds the predetermined maximum pressure. The motor is adapted to transmit drive torque to a reversible load (37) of the type having a known inertia and a predeterminable time of deceleration from maximum speed operation in one direction to a standstill condition. A flow restriction means (44) in series relationship between the charge pump and a fluid pressure responsive means (31,33) of the pump is selected such that reversal of the main control valve ( 43) from maximum displacement in one direction to maximum displacement in the opposite direction results in destroking of the pump in a time period approximately equal to the time of deceleration of the reversible load, thereby substantially preventing cavitation and high-pressure spikes.
REFERENCES:
patent: 3164960 (1965-01-01), Weisenbach et al.
patent: 3359727 (1967-12-01), Hann et al.
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3650108 (1972-03-01), Isaac
patent: 3884039 (1975-05-01), Pouriam
patent: 4041702 (1977-08-01), Habiger
patent: 4158290 (1979-06-01), Cornell
patent: 4167853 (1979-09-01), Hamma et al.
patent: 4189921 (1980-02-01), Knapp
patent: 4476680 (1984-10-01), Pollman et al.
patent: 4512723 (1985-04-01), Williams
patent: 4527393 (1985-07-01), Young
patent: 4617797 (1986-10-01), Williams
patent: 4694648 (1987-09-01), Beck, Jr.
Arlt Randal E.
Ross William A.
Eaton Corporation
Kasper L. J.
Look Edward K.
Ryznic John E.
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