Vane pump device that controls pressure pushing vanes against a cam ring
An embodiment provides a vane pump device. In the vane pump device, vane grooves of a rotor include columnar grooves which accommodate oil, and support the vanes. An inner-plate low pressure side recess portion and an inner-plate high pressure supply region are provided along a rotation direction of the rotor. The inner-plate low pressure side recess portion supplies oil to the columnar grooves at a first pressure, and the inner-plate high pressure supply region supplies oil at a second pressure higher than the first pressure. A size from an inner-plate low pressure side recess portion downstream end to an inner-plate high pressure side through-hole upstream end in the rotation direction is different from that from an inner-plate high pressure side recess portion downstream end to an inner-plate low pressure side recess portion upstream end in the rotation direction.
1. A vane pump device comprising:
multiple vanes;
a rotor that rotates due to a rotating force received from a rotation shaft, and includes vane grooves which are recessed from an outer circumferential surface of the rotor in a radial direction of rotation such that the vanes are supported in such a way as to be configured to move in the radial direction of rotation;
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the roto; and
pump chambers, each of which is defined by at least two adjacent vanes, the outer circumferential surface of the rotor, and the inner circumferential surface of the cam ring,
wherein the vane grooves of the rotor include center side spaces which are spaces on a rotation center side of the vane grooves, accommodate a working fluid, and support the vanes,
wherein a supply path that supplies the working fluid to the center side spaces is provided along a rotation direction of the rotor,
wherein, during one revolution of the rotor, each of the pump chambers suctions the working fluid from a first suction port and discharges the working fluid from a first discharge port at a first pressure, and suctions the working fluid from a second suction port and discharges the working fluid from a second discharge port at a second pressure higher than the first pressure,
wherein the supply path includes;
a first supply portion that supplies the working fluid to the center side spaces at the first pressure, and
a second supply portion that is seperated from the first supply portion by a distance between the first suction port and the second discharge port in the rotation direction, and supplies the working fluid to the center side spaces at the second pressure higher than the first pressure, and
wherein a circumferential length between a downstream end portion of the first supply portion and an upstream end portion of the second supply portion in the rotation direction is different from a circumferential length between a downstream end portion of the second supply portion and an upstream end portion of the first supply portion in the rotation direction.
2. The vane pump device according to claim 1 , further comprising:
a one side member that is disposed on one end portion side of the cam ring in a direction of a rotation axis to cover an opening of the cam ring; and
another side member that is disposed on the other end portion side of the cam ring in the direction of the rotation axis to cover an opening of the cam ring,
wherein the supply path includes a recess portion that is formed in a cam ring side end surface of at least one of the one side member and the other side member.
3. The vane pump device according to claim 2 ,
wherein the supply path includes recess portions which are formed in cam ring side end surfaces of the one side member and the other side member.
4. The vane pump device according to claim 1 ,
wherein in a range from the downstream end portion of the first supply portion to the upstream end portion of the second supply portion in the rotation direction, the upstream end portion of the second supply portion is positioned on an upstream side of a region in which the vanes start to protrude.
5. The vane pump device according to claim 1 ,
wherein the upstream end portion of the second supply portion is positioned on an upstream side of a position that is point symmetrical to the upstream end portion of the first supply portion about a rotation center of the rotor.
6. A vane pump device comprising:
multiple vanes;
a rotor that rotates due to a rotating force received from a rotation shaft, and includes vane grooves which are recessed from an outer circumferential surface of the rotor in a radial direction of rotation such that the vanes are supported in such a way as to be configured to move in the radial direction of rotation; and
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the rotor,
wherein pump chambers are formed to discharge a working fluid at multiple different discharge pressures during one revolution of the rotor, each of the pump chambers being a space surrounded by at least two adjacent vanes, the outer circumferential surface of the rotor, and the inner circumferential surface of the cam ring,
wherein the vane grooves of the rotor include center side spaces which are spaces on a rotation center side of the vane grooves, accommodate the working fluid, and support the vanes,
wherein a supply path that supplies the working fluid to the center side spaces is provided along a rotation direction of the rotor,
wherein the supply path includes:
a first supply portion that supplies the working fluid to the center side spaces at a first pressure, and
a second supply portion that is formed away from the first supply portion and supplies the working fluid to the center side spaces at a second pressure higher than the first pressure,
wherein in a region in which the pressure of the working fluid in the pump chambers switches from a low pressure to a high pressure, the second supply portion supplies the working fluid to the center side spaces at the second pressure before the vanes receive force from the working fluid at the high pressure in the pump chambers which pushes the vanes toward inside of the vane grooves, and
wherein the region is provided between a downstream end of the first supply portion and an upstream end of the second supply portion in the rotation direction.
7. A vane pump device comprising:
multiple vanes;
a rotor that rotates due to a rotating force received from a rotation shaft, and includes vane grooves which are recessed from an outer circumferential surface of the rotor in a radial direction of rotation such that the vanes are supported in such a way as to be configured to move in the radial direction of rotation;
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the rotor;
a one side member that is disposed on one end portion side of the cam ring in a direction of a rotation axis to cover an opening of the cam ring; and
another side member that is disposed on the other end portion side of the cam ring in the direction of the rotation axis to cover an opening of the cam ring,
wherein the vane grooves of the rotor include center side spaces which are spaces on a rotation center side of the vane grooves, accommodate a working fluid, and support the vanes,
wherein a supply path that supplies the working fluid to the center side spaces includes recess portions which are provided in cam ring side end surfaces of the one side member and the other side member along a rotation direction of the rotor,
wherein the supply path includes;
a first supply portion that supplies the working fluid to the center side spaces at a first pressure, and
a second supply portion that is formed away from the first supply portion and supplies the working fluid to the center side spaces at a second pressure higher than the first pressure,
wherein a downstream end portion of the second supply portion is point symmetrical to a downstream end portion of the first supply portion about a rotation center of the rotor, and
wherein an upstream end portion of the second supply portion is positioned on the upstream side of a position that is point symmetrical to an upstream end portion of the first supply portion about the rotation center of the rotor.
8. A vane pump device comprising: multiple vanes;
a rotor that rotates due to a rotating force received from a rotation shaft, and includes vane grooves which are recessed from an outer circumferential surface of the rotor in a radial direction of rotation such that the vanes are supported in such a way as to be configured to move in the radial direction of rotation; and
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the rotor,
wherein the vane grooves of the rotor include center side spaces which are spaces on a rotation center side of the vane grooves, accommodate a working fluid, and support the vanes,
wherein a supply path that supplies the working fluid to the center side spaces is provided along a rotation direction of the rotor,
wherein the supply path includes;
a first supply portion that supplies the working fluid to the center side spaces at a first pressure, and
a second supply portion that is formed away from the first supply portion and supplies the working fluid to the center side spaces at a second pressure higher than the first pressure, and
wherein a circumferential length between a downstream end portion of the first supply portion and an upstream end portion of the second supply portion in the rotation direction is smaller than a circumferential length between a downstream end portion of the second supply portion and an upstream end portion of the first supply portion in the rotation direction.