FLUID PRESSURE OPERATING DEVICE AND SHIFTING OPERATION CONTROL METHOD FOR THE SAME

PROBLEM TO BE SOLVED: To provide a multispeed fluid pressure operating device for avoiding cavitation and noises during a shift, and a shifting operation control method for the same. SOLUTION: A gerotor motor 10 has motor valve means 19, 43 for distributing fluid between fluid volume chambers to be...

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Hauptverfasser:	HECKEL JOHN BOYD, BARTO MICHAEL W, SCHUSTER MARK D, BERNSTROM MARVIN L
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a multispeed fluid pressure operating device for avoiding cavitation and noises during a shift, and a shifting operation control method for the same. SOLUTION: A gerotor motor 10 has motor valve means 19, 43 for distributing fluid between fluid volume chambers to be expanded 33E or contracted 33C and a shift valve spool 61 for performing either a normal low-speed and high-torque (LSHT) mode or a high-speed and low-torque (HSLT) mode. In the HSLT mode, some of volume chambers are used as recirculating volume chambers 33R. Furthermore, motor has a fluid resupplying flow path 89 for supplying fluid from a system charge pump 73 to each recirculating volume chamber 33R, and it also has a control valve 83 for avoiding cavitation during shift from the HSLT mode to the LSHT mode. COPYRIGHT: (C)2004,JPO