Variable-capacity vane pump

Abstract

A pump is provided, which includes: an internal housing inside which a vane rotor is housed; a pump housing 1 in which the centre of rotation of the vane rotor is immovable and the internal housing is able to move; a first control oil chamber which causes the internal housing to move in a direction of decreasing the discharge volume; and a second control oil chamber which causes the internal housing to move in a direction of increasing the discharge volume; a pressure adjustment valve; a temperature-sensitive valve; and an elastic member which elastically impels the internal housing. A flow passage area of the temperature-sensitive valve changes gradually with change in oil temperature, and the pressure adjustment valve changes a discharge volume in accordance with increase in pressure of the discharge oil.

1 . A variable-capacity vane pump, comprising: a vane rotor configured of a rotor section into which a plurality of vanes are inserted in projectable fashion; an internal housing having a rotor chamber in which the vane rotor is accommodated; a pump housing having an accommodating chamber in which the centre of rotation of the vane rotor is immovable and the internal housing is able to move; a first control oil chamber which moves the internal housing inside the accommodating chamber of the pump housing in a direction of decreasing a discharge volume; a second control oil chamber which moves the internal housing inside the accommodating chamber of the pump housing in a direction of increasing the discharge volume; a pressure adjustment valve which discharges oil inside the second control oil chamber of the pump housing; a temperature-sensitive valve into which a portion of the discharge oil flows; and an elastic member which is provided in the pump housing and which elastically impels the internal housing in a direction of increasing the volume of discharge by the vane rotor, wherein a flow passage area of the temperature-sensitive valve progressively changes as the oil temperature changes, and the pressure adjustment valve changes the discharge volume in accordance with increase in pressure of the discharge oil. 
     
     
         2 . The variable-capacity vane pump according to  claim 1 , wherein the temperature-sensitive valve has a role of relieving a portion of the discharge oil. 
     
     
         3 . The variable-capacity vane pump according to  claim 1 , wherein a third control oil chamber which causes the internal housing inside the accommodating chamber of the pump housing to move in a direction of decreasing the discharge volume is provided, and the third control oil chamber communicates with the temperature-sensitive valve and a portion of the discharge oil can flow thereinto. 
     
     
         4 . The variable-capacity vane pump according to  claim 1 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a first discharge port, a second inflow port and a second discharge port are formed along an axial direction of the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body has a first communication section and a second communication section in the axial direction, and the first communication section makes the first inflow port and the first discharge port communicate with each other, and the second communication section makes the second inflow port and the second discharge port communicate with each other. 
     
     
         5 . The variable-capacity vane pump according to  claim 3 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a first discharge port, a second inflow port and a second discharge port are formed along an axial direction of the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body has a first communication section and a second communication section in the axial direction, and the first communication section makes the first inflow port and the first discharge port communicate with each other, and the second communication section makes the second inflow port and the second discharge port communicate with each other. 
     
     
         6 . The variable-capacity vane pump according to  claim 1 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first discharge port, a second discharge port and a third discharge port are formed in order in the cylinder, with a side of the cylinder inflow section being a base point, and a common inflow port capable of communicating with the first discharge port, the second discharge port and the third discharge port is formed in the cylinder, a common communication section is formed in the spool valve body, and the common communication section is capable of making the common inflow port, the first discharge port, the second discharge port and the third discharge port communicate with one another. 
     
     
         7 . The variable-capacity vane pump according to  claim 3 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first discharge port, a second discharge port and a third discharge port are formed in order in the cylinder, with a side of the cylinder inflow section being a base point, and a common inflow port capable of communicating with the first discharge port, the second discharge port and the third discharge port is formed in the cylinder, a common communication section is formed in the spool valve body, and the common communication section is capable of making the common inflow port, the first discharge port, the second discharge port and the third discharge port communicate with one another. 
     
     
         8 . The variable-capacity vane pump according to  claim 1 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a second inflow port, a first discharge port and a second discharge port are formed in the axial direction in the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body includes a valve interior chamber section, and a valve interior inflow hole and a valve interior outflow hole which make the valve interior chamber section and the exterior of the spool valve body communicate with each other, and an interval between the valve interior inflow hole and the valve interior outflow hole is equal to an interval between the first inflow port and the first discharge port, and between the second inflow port and the second discharge port. 
     
     
         9 . The variable-capacity vane pump according to  claim 3 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a second inflow port, a first discharge port and a second discharge port are formed in the axial direction in the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body includes a valve interior chamber section, and a valve interior inflow hole and a valve interior outflow hole which make the valve interior chamber section and the exterior of the spool valve body communicate with each other, and an interval between the valve interior inflow hole and the valve interior outflow hole is equal to an interval between the first inflow port and the first discharge port, and between the second inflow port and the second discharge port. 
     
     
         10 . The variable-capacity vane pump according to  claim 1 , wherein an orifice is provided in the inflow section of the second control oil chamber. 
     
     
         11 . The variable-capacity vane pump according to  claim 3 , wherein an orifice is provided in the inflow section of the second control oil chamber. 
     
     
         12 . The variable-capacity vane pump according to  claim 1 , wherein an orifice and a drain are provided downstream the third control oil chamber. 
     
     
         13 . The variable-capacity vane pump according to  claim 3 , wherein an orifice and a drain are provided downstream the third control oil chamber. 
     
     
         14 . The variable-capacity vane pump according to  claim 1 , wherein the internal housing is a rectangular plate-shaped section, and the rotor chamber, which has a circular shape, is formed in an intermediate portion of the plate-shaped section. 
     
     
         15 . The variable-capacity vane pump according to  claim 3 , wherein the internal housing is a rectangular plate-shaped section, and the rotor chamber, which has a circular shape, is formed in an intermediate portion of the plate-shaped section. 
     
     
         16 . The variable-capacity vane pump according to  claim 1 , wherein the internal housing is configured of a ring-shaped section and an operating protrusion section, a recess-shaped operation region is formed in a portion of the accommodating chamber of the pump housing, and the operation protrusion section is arranged inside the recess-shaped operation region. 
     
     
         17 . The variable-capacity vane pump according to  claim 3 , wherein the internal housing is configured of a ring-shaped section and an operating protrusion section, a recess-shaped operation region is formed in a portion of the accommodating chamber of the pump housing, and the operation protrusion section is arranged inside the recess-shaped operation region. 
     
     
         18 . The variable-capacity vane pump according to  claim 2 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a first discharge port, a second inflow port and a second discharge port are formed along an axial direction of the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body has a first communication section and a second communication section in the axial direction, and the first communication section makes the first inflow port and the first discharge port communicate with each other, and the second communication section makes the second inflow port and the second discharge port communicate with each other. 
     
     
         19 . The variable-capacity vane pump according to  claim 2 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first discharge port, a second discharge port and a third discharge port are formed in order in the cylinder, with a side of the cylinder inflow section being a base point, and a common inflow port capable of communicating with the first discharge port, the second discharge port and the third discharge port is formed in the cylinder, a common communication section is formed in the spool valve body, and the common communication section is capable of making the common inflow port, the first discharge port, the second discharge port and the third discharge port communicate with one another. 
     
     
         20 . The variable-capacity vane pump according to  claim 2 , wherein the pressure adjustment valve comprises a cylinder and a spool valve body, a cylinder inflow section, into which a portion of the discharge oil flows, is provided in the cylinder, a first inflow port, a second inflow port, a first discharge port and a second discharge port are formed in the axial direction in the cylinder, with a side of the cylinder inflow section being a base point, the spool valve body includes a valve interior chamber section, and a valve interior inflow hole and a valve interior outflow hole which make the valve interior chamber section and the exterior of the spool valve body communicate with each other, and an interval between the valve interior inflow hole and the valve interior outflow hole is equal to an interval between the first inflow port and the first discharge port, and between the second inflow port and the second discharge port. 
     
     
         21 . The variable-capacity vane pump according to  claim 2 , wherein an orifice is provided in the inflow section of the second control oil chamber. 
     
     
         22 . The variable-capacity vane pump according to  claim 2 , wherein an orifice and a drain are provided downstream the third control oil chamber. 
     
     
         23 . The variable-capacity vane pump according to  claim 2 , wherein the internal housing is a rectangular plate-shaped section, and the rotor chamber, which has a circular shape, is formed in an intermediate portion of the plate-shaped section. 
     
     
         24 . The variable-capacity vane pump according to  claim 2 , wherein the internal housing is configured of a ring-shaped section and an operating protrusion section, a recess-shaped operation region is formed in a portion of the accommodating chamber of the pump housing, and the operation protrusion section is arranged inside the recess-shaped operation region.