Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1990-09-06
1991-09-17
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60434, 60444, 60488, F15B 904
Patent
active
050482947
ABSTRACT:
A variable displacement hydraulic pump and a hydraulic motor are connected in a closed circuit. A pressure oil supply means includes the variable displacement hydraulic pump and a tilting controlling means for controlling a tilt angle of the hydraulic pump and supplies an amount of pressure oil corresponding to the tilt angle of the hydraulic pump to the hydraulic motor. When rotation of a prime mover is detected by a rotation detecting means, an opening and closing valve is changed over to a first position in which the pressure oil supply means is permitted to supply pressure oil. When stopping of the prime mover is detected by the rotation detecting means, the opening and closing valve is changed to a second position in which the pressure oil supply means is inhibited from supplying pressure oil. Upon starting of the prime mover, at least the opening and closing valve remains at the second position, and the tilting controlling means increases its tilt angle from its neutral position so that the pressure oil supply means supplies pressure oil. Consequently, upon re-starting of the prime mover, pressure oil is prevented from being supplied inadvertently to the hydraulic motor, and the safety upon starting is assured.
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Kanai Takashi
Nozaki Koji
Ochiai Masami
Oshina Morio
Hitachi Construction Machinery Co. Ltd.
Kapsalas George
Look Edward K.
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