Vane pump device
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 is provided in an end surface of an inner plate along a rotation direction, and supplies oil to the columnar grooves. An outer-plate low pressure side through-hole and an outer-plate low pressure side recess portion are provided in an end surface of an outer plate along the rotation direction, and supply oil to the columnar grooves at a position facing the inner-plate low pressure side recess portion. An opening area of the inner-plate low pressure side recess portion is equal to a sum of opening areas of the outer-plate low pressure side through-hole and the outer-plate low pressure side recess portion.
1. A vane pump device comprising:
multiple vanes;
a rotor that includes vane grooves which are recessed from an outer circumferential surface of the rotor such that the vanes are supported in such a way as to be capable of moving in a radial direction of rotation, and which form center side spaces accommodating a working fluid on a rotation center side, and that rotates due to a rotating force received from a rotation shaft;
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the rotor;
one cover member that is disposed on one end portion side of the cam ring in a direction of a rotation axis to cover a first opening of the cam ring; and
another cover member that is disposed on the other end portion side of the cam ring in the direction of the rotation axis to cover a second opening of the cam ring,
wherein a first supply path is provided in a cam ring side end surface of the one cover member along a rotation direction of the rotor, and supplies the working fluid to the center side spaces,
wherein a second supply path is provided in a cam ring side end surface of the other cover member along the rotation direction of the rotor, and supplies the working fluid to the center side spaces at a position facing the first supply path, and
wherein an opening area of the first supply path in the cam ring side end surface of the one cover member is equal to that of the second supply path in the cam ring side end surface of the other cover member,
wherein the first supply path includes a first supply path groove that is provided in the cam ring side end surface of the one cover member, and
wherein the first supply path groove includes:
a first groove portion that accommodates the working fluid,
a second groove portion that is positioned on a downstream side of the first groove portion in the rotation direction, and
a third groove portion that connects the first groove portion and the second groove portion, and that reduces a passage of the working fluid flowing between the first groove portion and the second groove portion,
wherein the second supply path includes a second supply path groove and a through-hole, and
wherein the second supply path groove is not connected to the through-hole.
2. The vane pump device according to claim 1 , wherein the second supply path groove and the through-hole are provided in the cam ring side end surface of the other cover member.
3. The vane pump device according to claim 1 ,
wherein a width of the second groove portion in the radial direction of rotation is different from that of the first groove portion in the radial direction of rotation.
4. The vane pump device according to claim 3 ,
wherein a width of the second groove portion in the radial direction of rotation is equal to that of the third groove portion in the radial direction of rotation.
5. The vane pump device according to claim 3 ,
wherein a depth of the second groove portion in the direction of the rotation axis is deeper than that of the third groove portion in the direction of the rotation axis.
6. A vane pump device comprising:
multiple vanes;
a rotor that includes vane grooves which are recessed from an outer circumferential surface of the rotor such that the vanes are supported in such a way as to be capable of moving in a radial direction of rotation, and which form center side spaces accommodating a working fluid on a rotation center side, and that rotates due to a rotating force received from a rotation shaft;
a cam ring that includes an inner circumferential surface facing the outer circumferential surface of the rotor, and surrounds the rotor;
one cover member that is disposed on one end portion side of the cam ring in a direction of a rotation axis to cover a first opening of the cam ring; and
another cover member that is disposed on the other end portion side of the cam ring in the direction of the rotation axis to cover a second opening of the cam ring,
wherein a first groove, which supplies the working fluid to the center side spaces at a low pressure, and a second groove and a first through-hole, which supply the working fluid to the center side spaces at a high pressure and which are not connected to each other, are provided in a cam ring side end surface of the one cover member along a rotation direction of the rotor,
wherein a third groove and a second through-hole, which supply the working fluid to the center side spaces at a low pressure at a position facing the first groove and which are not connected to each other, and a fourth groove, which supplies the working fluid to the center side spaces at a high pressure at a position facing the second groove and the first through-hole, are provided in a cam ring side end surface of the other cover member along the rotation direction of the rotor,
wherein an opening area of the first groove in the cam ring side end surface of the one cover member is equal to that of the third groove and the second through-hole in the cam ring side end surface of the other cover member and
wherein an opening area of the second groove and the first through-hole in the cam ring side end surface of the one cover member is equal to that of the fourth groove in the cam ring side end surface of the other cover member.