Variable displacement oil pump
AssigneeYamada Manufacturing Co., Ltd.
InventorsRyosuke Osaki, Yuji Senbongi, Takatoshi Watanabe, Haruyo Kobayashi
Life of this patent
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Abstract
To provide a rotor portion 2A; a cam ring 21 having a rotor chamber 21a; a pump housing 1 provided with a pump chamber 11 having a control chamber 12 where the cam ring 21 is movably arranged to move the cam ring 21 using an oil pressure; a spool valve A for controlling the cam ring 21; a solenoid valve 81; and a relief valve 83. Each valve housing is provided with a communication hole 7 for supplying oil from the control chamber 12 of the pump chamber 11 to a portion between the control chamber 12 and at least one of the valve housings. A through-hole for discharging the oil is formed in the valve housing.
Claims20
A variable displacement oil pump comprising:
- a rotor portion;
- a cam ring having a rotor chamber for housing the rotor portion;
- a pump housing provided with a pump chamber having a control chamber where the cam ring is movably arranged to move the cam ring using an oil pressure;
- a spool valve;
- a solenoid valve;
- and
- a relief valve,
- wherein at least one of the spool valve, the solenoid valve, and the relief valve has a valve housing provided with a communication hole for supplying oil from the control chamber to a portion between the control chamber of the pump chamber and at least one of the valve housings, and
- a through-hole for discharging oil is formed in the valve housing provided with the communication hole.
Dependencies are inferred from the claim text.