Variable-capacity oil pump and oil supply system using same

A variable-capacity oil pump for discharging oil into a main oil gallery comprising:

• pump components rotationally driven by an internal combustion engine to change volumes of a plurality of operating oil chambers and to discharge the oil;
• a variable mechanism that alters variations of the volumes of the operating oil chambers by movement of a movable member;
• a suction part having a structure that opens into the operating oil chambers whose volumes increase by rotationally driving the pump components;
• a discharge part having a structure that opens into the operating oil chambers whose volumes decrease by rotationally driving the pump components;
• a biasing mechanism that biases the movable member in a direction in which the variations of the volumes of the operating oil chambers increase;
• a first control chamber that applies a force, caused by introduction of the oil from the main oil gallery into the first control chamber, to the movable member in a direction in which the variations of the volumes of the operating oil chambers decrease;
• a second control chamber that applies a force, caused by introduction of the oil from the main oil gallery into the second control chamber, to the movable member in the direction in which the variations of the volumes of the operating oil chambers increase;
• a first branch flow path that is branched from the main oil gallery and that communicates with the first control chamber;
• a second branch flow path that is branched from the first branch flow path and that communicates with the second control chamber;
• an electromagnetic valve that is connected to the second branch flow path and that establishes fluid-communication between the second control chamber and the main oil gallery in a de-energized state, and that establishes fluid-communication between the second control chamber and a low-pressure part in an energized state;
• and
• an oil filter disposed between a junction of the first branch flow path to the main oil gallery and a branch part at which the second branch flow path is branched from the first branch flow path.

In an oil supply system configured to supply oil from a variable-capacity oil pump to a main oil gallery, the variable-capacity oil pump comprising:

• a rotor rotationally driven by an internal combustion engine;
• a plurality of vanes retractably located in an outer periphery of the rotor;
• a cam ring that houses the rotor and the vanes on an inner peripheral side to define a plurality of operating oil chambers, and that changes an eccentricity of a center of an inner peripheral surface of the cam ring from a rotation center of the rotor by a displacement of the cam ring;
• a suction part having a structure that opens into the operating oil chambers whose volumes increase by rotationally driving the rotor;
• a discharge part having a structure that opens into the operating oil chambers whose volumes decrease by rotationally driving the rotor;
• a biasing mechanism that biases the cam ring in a direction in which the eccentricity of the cam ring with respect to the rotation center of the rotor increases;
• a first control chamber defined on an outer peripheral side of the cam ring and that applies a force, caused by introduction of oil pressure from the main oil gallery into the first control chamber, to the cam ring in a direction in which the eccentricity of the cam ring with respect to the rotor decreases;
• a second control chamber defined on the outer peripheral side of the cam ring and that applies a force, caused by introduction of the oil pressure from the main oil gallery into the second control chamber, to the cam ring in the direction in which the eccentricity of the cam ring with respect to the rotor increases;
• a first branch flow path that is branched from the main oil gallery and that communicates with the first control chamber;
• a second branch flow path that is branched from the first branch flow path and that communicates with the second control chamber;
• an electromagnetic valve that is connected to the second branch flow path and that establishes fluid-communication between the second control chamber and the main oil gallery in a de-energized state, and that establishes fluid-communication between the second control chamber and a low-pressure part in an energized state;
• and
• an additional oil filter disposed between a junction of the first branch flow path to the main oil gallery and a branch part at which the second branch flow path is branched from the first branch flow path.

An oil supply system configured to supply oil from a variable-capacity oil pump to a main oil gallery, the oil supply system comprising:

• pump components rotationally driven by an internal combustion engine to change volumes of a plurality of operating oil chambers and to discharge the oil;
• a variable mechanism that alters variations of the volumes of the operating oil chambers by movement of a movable member;
• a suction part having a structure that opens into the operating oil chambers whose volumes increase by rotationally driving the pump components;
• a discharge part having a structure that opens into the operating oil chambers whose volumes decrease by rotationally driving the pump components;
• a biasing mechanism that biases the movable member in a direction in which the variations of the volumes of the operating oil chambers increase;
• a first control chamber that biases a force, caused by introduction of the oil from the main oil gallery into the first control chamber, to the movable member in a direction in which the variations of the volumes of the operating oil chambers decrease;
• a second control chamber that applies a force, caused by introduction of the oil from the main oil gallery into the second control chamber, to the movable member in the direction in which the variations of the volumes of the operating oil chambers increase;
• a first branch flow path that is branched from the main oil gallery and that communicates with the first control chamber;
• a second branch flow path that is branched from the first branch flow path and that communicates with the second control chamber;
• an electromagnetic valve that is connected to the second branch flow path and that establishes fluid-communication between the second control chamber and the main oil gallery in a de-energized state, and that establishes fluid-communication between the second control chamber and a low-pressure part in an energized state;
• and
• an oil filter disposed between a junction of the first branch flow path to the main oil gallery and a branch part at which the second branch flow path is branched from the first branch flow path.