Variable displacement oil pump

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.

What is claimed is: 
     
         1 . 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.   
     
     
         2 . The variable displacement oil pump according to  claim 1 , wherein
 the rotor portion includes a vane rotor and a plurality of vanes.   
     
     
         3 . The variable displacement oil pump according to  claim 1 , wherein
 the rotor portion has an inner rotor having outer teeth and an outer rotor that has inner teeth that form cells along with the outer teeth and rotates with a predetermined eccentricity with respect to a rotation center of the inner rotor,   a protrusion is formed in an outer circumference of the cam ring, and   the protrusion is placed in the control chamber.   
     
     
         4 . The variable displacement oil pump according to  claim 1 , wherein
 the spool valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the spool valve communicate with each other,   the spool valve has the valve housing, a spool valve body, a spring, and a sealing bolt,   the valve housing has a communication hole provided in the pump housing to supply oil into the control chamber of the pump chamber and the valve housing between the spool valve body of the valve housing and the sealing bolt, and   a through-hole for discharging oil of the valve housing is provided in the sealing bolt.   
     
     
         5 . The variable displacement oil pump according to  claim 2 , wherein
 the spool valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the spool valve communicate with each other,   the spool valve has the valve housing, a spool valve body, a spring, and a sealing bolt,   the valve housing has a communication hole provided in the pump housing to supply oil into the control chamber of the pump chamber and the valve housing between the spool valve body of the valve housing and the sealing bolt, and   a through-hole for discharging oil of the valve housing is provided in the sealing bolt.   
     
     
         6 . The variable displacement oil pump according to  claim 3 , wherein
 the spool valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the spool valve communicate with each other,   the spool valve has the valve housing, a spool valve body, a spring, and a sealing bolt,   the valve housing has a communication hole provided in the pump housing to supply oil into the control chamber of the pump chamber and the valve housing between the spool valve body of the valve housing and the sealing bolt, and   a through-hole for discharging oil of the valve housing is provided in the sealing bolt.   
     
     
         7 . The variable displacement oil pump according to  claim 4 , wherein
 the sealing bolt has a cylindrical restricting protrusion formed to restrict a movement range of the spool valve body or stop a movement of the spool valve body.   
     
     
         8 . The variable displacement oil pump according to  claim 5 , wherein
 the sealing bolt has a cylindrical restricting protrusion formed to restrict a movement range of the spool valve body or stop a movement of the spool valve body.   
     
     
         9 . The variable displacement oil pump according to  claim 6 , wherein
 the sealing bolt has a cylindrical restricting protrusion formed to restrict a movement range of the spool valve body or stop a movement of the spool valve body.   
     
     
         10 . The variable displacement oil pump according to  claim 1 , wherein
 the communication hole is an orifice.   
     
     
         11 . The variable displacement oil pump according to  claim 2 , wherein
 the communication hole is an orifice.   
     
     
         12 . The variable displacement oil pump according to  claim 3 , wherein
 the communication hole is an orifice.   
     
     
         13 . The variable displacement oil pump according to  claim 1 , wherein
 the communication hole is provided in a cover of the pump housing.   
     
     
         14 . The variable displacement oil pump according to  claim 2 , wherein
 the communication hole is provided in a cover of the pump housing.   
     
     
         15 . The variable displacement oil pump according to  claim 3 , wherein
 the communication hole is provided in a cover of the pump housing.   
     
     
         16 . The variable displacement oil pump according to  claim 1 , wherein
 the relief valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the relief valve communicate with each other,   the relief valve has the valve housing, a relief valve body, and a relief spring,   the valve housing has the relief valve body, a relief chamber closed by an elastic member, and a relief vent opened to the outside at all time, and   the communication hole communicates with the relief vent of the valve housing.   
     
     
         17 . The variable displacement oil pump according to  claim 2 , wherein
 the relief valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the relief valve communicate with each other,   the relief valve has the valve housing, a relief valve body, and a relief spring,   the valve housing has the relief valve body, a relief chamber closed by an elastic member, and a relief vent opened to the outside at all time, and   the communication hole communicates with the relief vent of the valve housing.   
     
     
         18 . The variable displacement oil pump according to  claim 3 , wherein
 the relief valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the relief valve communicate with each other,   the relief valve has the valve housing, a relief valve body, and a relief spring,   the valve housing has the relief valve body, a relief chamber closed by an elastic member, and a relief vent opened to the outside at all time, and   the communication hole communicates with the relief vent of the valve housing.   
     
     
         19 . The variable displacement oil pump according to  claim 1 , wherein
 the solenoid valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the solenoid valve communicate with each other,   the solenoid valve has the valve housing, the solenoid valve body, and a solenoid control unit, and   the control chamber communicates with a non-reaching region of the solenoid valve body of the solenoid valve chamber of the valve housing.   
     
     
         20 . The variable displacement oil pump according to  claim 2 , wherein
 the solenoid valve is used as a valve for controlling operation of the cam ring,   the control chamber and the valve housing of the solenoid valve communicate with each other,   the solenoid valve has the valve housing, the solenoid valve body, and a solenoid control unit, and   the control chamber communicates with a non-reaching region of the solenoid valve body of the solenoid valve chamber of the valve housing.