VARIABLE DISPLACEMENT BIDIRECTIONAL ROTARY PUMP AND HYDRAULIC CIRCUIT USING THIS PUMP

摘要

PROBLEM TO BE SOLVED: To provide a bidirectional rotary pump efficient more than a conventional pump with a miniaturized motor by minimizing load torque applied to the motor when controlling pressure by controlling a large flow rate when controlling a flow rate.;SOLUTION: This variable displacement bidirectional rotary pump has a bidirectional rotary pump mechanism, a variable displacement mechanism for changing delivery capacity per unit rotation of the pump mechanism by being mechanically displaced in response to an increase-decrease in pilot pressure acting on a pressure receiving part and a selector valve for forming the first circuit connection for reducing the pilot pressure by connecting the pressure receiving part to a low pressure side flow passage when displacing the variable displacement mechanism to the large capacity side and forming the second circuit connection for introducing one's own delivery pressure of the pump mechanism to the pressure receiving part as the pilot pressure when displacing the variable displacement mechanism to the small capacity side.;COPYRIGHT: (C)2007,JPO&INPIT