Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1990-12-05
1992-11-03
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60466, 60460, 60468, 60493, 60494, F16D 3102
Patent
active
051598132
ABSTRACT:
A slewing control device for a hydraulic slewing crane adapted to supply a discharge oil from a hydraulic pump through a slewing control valve to a slewing motor and control a rotational direction and a rotational speed of the slewing motor. The slewing control device includes a brake pressure control valve for variably controlling a discharge pressure of the slewing motor, an acceleration pressure control valve for variably controlling a suction pressure of the slewing motor, and a controller for outputting to both pressure control valves a pressure control signal to be determined according to an operational condition of the crane upon braking of a slewing body and controlling both the discharge pressure and the suction pressure of the slewing motor to control a pressure differential therebetween. Accordingly, even when a braking torque is small, the slewing body can be smoothly braked to be stopped at a target position accurately with no oscillation of a suspended load remaining.
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Patent Abstracts of Japan--Unexamined Applications, Jul. 11, 1987, vol. 11, No. 215, p. 24M606.
Fukushima Koichi
Yoshimatsu Hideaki
Kabushiki Kaisha Kobe Seiko Sho
Look Edward K.
Mattingly Todd
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