JPWO2020084666A1 - Vane pump device - Google Patents

Abstract

The vane pump device receives rotational force from the rotation axis and rotates while supporting a plurality of vanes 30, and also has an arcuate curved surface portion 22 centered on the rotation axis, from the curved surface portion 22 to the rotation center C side. A rotor 20 in which a rotor recess 24 is formed, a cam ring 40 having an inner peripheral surface facing the curved surface portion 22 of the rotor 20 and arranged so as to surround the rotor 20, and a rotation axis in the cam ring 40. An inner plate 50 which is arranged so as to cover the opening of the cam ring 40 at one end in the axial direction and has a suction inner recess 712 recessed toward the rotation center C side of the curved surface 22 of the rotor 20. To be equipped.

Description

The present invention relates to a vane pump device.

The vane pump described in Patent Document 1 includes a rotor that rotates by being coupled to a rotating shaft pivotally supported inside the housing, a cam ring that is arranged so as to surround the rotor inside the housing, and a plurality of vane pumps in the radial direction of the rotor. Corresponding to a plurality of vanes slidably arranged in the provided vane groove, a plurality of pump chambers partitioned by adjacent vanes around the rotor, and a pump chamber for performing a compression stroke, in the radial direction of the rotor. It has a plurality of discharge ports provided so as to face each other. In the vane pump described in Patent Document 1, the rotor is formed with a recess recessed from the outer peripheral surface in the direction of the center of rotation.

Japanese Unexamined Patent Publication No. 2013-50067

In order to reduce the viscosity of the oil used as the working fluid of the vane pump, the content of air bubbles (air) contained in the oil tends to increase. Inhalation of oil having a high content of air bubbles may lead to, for example, a decrease in suction / discharge efficiency, fluctuation in discharge pressure, and deterioration of noise. In order to suppress a decrease in suction / discharge efficiency due to an increase in the content of air bubbles contained in the oil, the volume of the pump chamber is reduced and the absolute amount of oil sucked into the pump chamber is lowered. Can be considered. Therefore, it is conceivable to make the outer peripheral surface of the rotor into an arc shape centered on the center of rotation of the rotor. However, if the outer peripheral surface of the rotor is simply changed to an arc shape centered on the rotation center of the rotor in order to reduce the volume of the pump chamber, the suction efficiency may decrease and the pump performance may decrease. ..
An object of the present invention is to provide a vane pump device capable of suppressing a decrease in pump performance while reducing an amount of air bubbles contained in a working fluid.

The present invention completed for this purpose receives rotational force from a rotating shaft, rotates while supporting a plurality of vanes, and has an arc-shaped curved surface portion centered on the rotating shaft. A rotor having a first concave portion recessed from the curved surface portion toward the center of rotation, a cam ring having an inner peripheral surface facing the curved surface portion of the rotor and arranged so as to surround the rotor, and the cam ring. A second recess is formed at one end of the rotation shaft on one side in the axial direction so as to cover the opening of the cam ring, and is recessed toward the center of rotation of the rotor from the curved surface. A vane pump device including a side member.

According to the present invention, it is possible to provide a vane pump device capable of suppressing a decrease in pump performance while reducing an amount of air bubbles contained in a working fluid.

It is a perspective view which looked at a part of the component parts of a vane pump from a cover side. It is a perspective view which saw a part of the component part of a vane pump from the case side. It is sectional drawing for showing the flow path of the 1st oil of a vane pump. It is sectional drawing for showing the 2nd oil flow path of a vane pump. It is the figure which looked at the rotor, vane and cam ring in one direction of the rotation axis direction, and is the figure which looked at the other direction. It is a figure which shows the distance from the rotation center for every rotation angle on the inner peripheral surface of a cam ring of a cam ring. It is the figure which looked at the inner plate in one direction and the other direction in the rotation axis direction. It is the figure which looked at the outer plate in the other direction of the rotation axis direction, and in one direction. It is the figure which looked at the case in one direction of the rotation axis direction. It is the figure which looked at the cam ring and the inner plate in one direction. It is sectional drawing of the XI-XI part of FIG. It is a perspective view of a rotor, a plurality of vanes, a cam ring and an outer plate. It is a figure which shows the schematic structure of the suction inner part of the vane pump which concerns on 2nd Embodiment. It is a figure which shows the schematic structure of the suction inner part of the vane pump which concerns on 3rd Embodiment. It is a figure which shows the schematic structure of the suction inner part of the vane pump which concerns on 4th Embodiment. It is a figure which looked at the inner plate which concerns on 5th Embodiment in one direction and the other direction in the rotation axis direction. It is a figure which looked at the outer plate which concerns on 5th Embodiment in the other direction of the rotation axis direction, and in one direction. It is the figure which looked at the cam ring and the inner plate in one direction. It is a figure which shows the modification of the rotor concave part of a rotor. It is a figure which shows the deformation example of the curved surface part of a rotor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<First Embodiment>
FIG. 1 is a perspective view of a part of the components of the vane pump device 1 (hereinafter, referred to as “vane pump 1”) according to the embodiment as viewed from the cover 120 side.
FIG. 2 is a perspective view of a part of the components of the vane pump 1 as viewed from the case 110 side.
FIG. 3 is a cross-sectional view for showing the flow path of the first oil of the vane pump 1. FIG. 3 is also a cross-sectional view of parts III-III of FIG.
FIG. 4 is a cross-sectional view for showing the flow path of the second oil of the vane pump 1. FIG. 4 is also a cross-sectional view of the IV-IV portion of FIG.
The vane pump 1 is a pump that is driven by power from an engine of a vehicle, for example, to supply oil as an example of a working fluid to equipment such as a hydraulic continuously variable transmission or a hydraulic power steering.

Further, the vane pump 1 discharges the oil sucked from one suction port 116 from the first discharge port 117 and the second discharge port 118, which are two different discharge ports. The pressures of the oil discharged from the first discharge port 117 and the second discharge port 118 may be the same or different. More specifically, in the vane pump 1, the oil sucked from the suction port 116 and sucked into the pump chamber from the first suction port 2 (see FIG. 3) is increased in pressure in the pump chamber to increase the pressure in the first discharge port 4. It is discharged from (see FIG. 3) and discharged to the outside from the first discharge port 117. In addition, the vane pump 1 increases the pressure in the pump chamber to increase the pressure of the oil sucked from the suction port 116 and sucked into the pump chamber from the second suction port 3 (see FIG. 4) to the second discharge port 5 (FIG. 4). Refer to) and discharge from the second discharge port 118 to the outside. The first suction port 2, the second suction port 3, the first discharge port 4, and the second discharge port 5 are portions facing (facing) the pump chamber.

The vane pump 1 includes a rotating shaft 10 that rotates by receiving a driving force from a vehicle engine or a motor, a rotor 20 that rotates together with the rotating shaft 10, and a plurality of vanes 30 incorporated in a groove formed in the rotor 20. , A cam ring 40 surrounding the outer periphery of the rotor 20 and the vane 30.
Further, the vane pump 1 is arranged on the inner plate 50 as an example of the one-side member arranged on one end side of the rotating shaft 10 with respect to the cam ring 40, and on the other end side of the rotating shaft 10 with respect to the cam ring 40. An outer plate 60 is provided as an example of the other side member.
Further, the vane pump 1 includes a rotor 20, a plurality of vanes 30, a cam ring 40, an inner plate 50, and a housing 100 for accommodating an outer plate 60. The housing 100 has a bottomed cylindrical case 110 and a cover 120 that covers the opening of the case 110.

<Structure of rotating shaft 10>
The rotating shaft 10 is rotatably supported by a case-side bearing 111 provided on the case 110 and a cover-side bearing 121 provided on the cover 120, which will be described later. A spline 11 is formed on the outer peripheral surface of the rotating shaft 10, and is connected to the rotor 20 via the spline 11. In the present embodiment, the rotary shaft 10 rotates by receiving power from a drive source arranged outside the vane pump 1 such as a vehicle engine, and rotationally drives the rotor 20 via the spline 11.
In the vane pump 1 according to the first embodiment, the rotating shaft 10 (rotor 20) is configured to rotate in the clockwise rotation direction in FIG.

<Structure of rotor 20>
FIG. 5 is a view of the rotor 20, the vane 30, and the cam ring 40 in one direction and the other direction in the rotation axis direction.
The rotor 20 is a member having a cylindrical shape in general. A spline 21 into which the spline 11 (see FIG. 1) of the rotating shaft 10 is fitted is formed on the inner peripheral surface of the rotor 20. The rotor 20 has an arcuate curved surface portion 22 centered on the rotation center C of the rotation shaft 10 on the outer peripheral portion. Further, on the outer peripheral portion of the rotor 20, a plurality of vane grooves 23 accommodating the vanes 30 recessed in the rotation center C direction from the outer peripheral surface of the rotor 20 are provided at equal intervals (radially) in the circumferential direction (in the present embodiment). 10) are formed. Further, a rotor recess 24 is formed on the outer peripheral portion of the rotor 20 as an example of a first recess recessed from the curved surface portion 22 toward the rotation center C side.

The curved surface portion 22 is formed between two adjacent vane grooves 23.
The vane groove 23 is a groove that opens on the outer peripheral surface of the rotor 20 and both end surfaces of the rotation shaft 10 in the rotation axis direction, respectively. When viewed in the direction of the rotation axis, the vane groove 23 is a rectangle whose outer peripheral side is the longitudinal direction in the radial direction of rotation, and the center C side of the rotation is in the lateral direction of the rectangle, as shown in FIG. It is a circular shape with a diameter larger than the length of. That is, the vane groove 23 has a rectangular parallelepiped groove 231 formed in a rectangular parallelepiped shape on the outer peripheral portion side, and a columnar groove 232 as an example of a central side space formed in a columnar shape on the rotation center C side. There is.

The rotor recesses 24 are formed at both ends in the rotation axis direction. Further, the rotor recess 24 is formed in the central portion of the curved surface portion 22 in the circumferential direction. The shape of the rotor recess 24 in the rotation axis direction is a chamfered shape that gradually moves toward the rotation center C side from the central portion side in the rotation axis direction toward the end portion.

<Structure of vane 30>
The vane 30 is a rectangular parallelepiped member, and one vane 30 is incorporated in each of the vane grooves 23 of the rotor 20. The vane 30 has a length in the radial direction of rotation smaller than the length of the vane groove 23 in the radial direction of rotation, and a width smaller than the width of the vane groove 23. Then, the vane 30 is held in the vane groove 23 so as to be movable in the radial direction of rotation.

<Structure of cam ring 40>
The cam ring 40 is a member having a cylindrical shape in its outline, and has an outer peripheral surface 41 of the cam ring, an inner peripheral surface 42 of the cam ring, an inner end surface 43 which is an end surface on the inner plate 50 side in the rotation axis direction, and an outer plate in the rotation axis direction. It has an outer end face 44, which is an end face on the 60 side.
As shown in FIG. 5, the cam ring outer peripheral surface 41 has a substantially circular shape in which the distance from the rotation center C is substantially the same over the entire circumference (except for a part) when viewed in the direction of the rotation axis.

FIG. 6 is a diagram showing a distance L from the rotation center C for each rotation angle on the inner peripheral surface 42 of the cam ring of the cam ring 40.
As shown in FIG. 6, the cam ring inner peripheral surface 42 of the cam ring 40 has a distance L (in other words, a vane groove of the vane 30) from the rotation center C (see FIG. 5) for each rotation angle when viewed in the rotation axis direction. It is formed so that there are two convex portions (amount of protrusion from 23). That is, the distance L from the center of rotation C gradually increases from about 20 degrees to about 90 degrees in the counterclockwise rotation direction when the positive vertical axis in the one-way view shown in FIG. 5 is zero. The first convex portion 42a is formed by gradually decreasing toward about 160 degrees, and the second gradually increases from about 200 degrees to about 270 degrees and gradually decreases toward about 340 degrees. It is set to form the convex portion 42b. In the cam ring 40 according to the present embodiment, the sizes of the two convex portions are the same.

As shown in FIG. 5, the cam ring 40 is formed with an inner recess 430 which is a plurality of recesses recessed from the inner end surface 43 and an outer recess 440 which is a plurality of recesses recessed from the outer end surface 44.
As shown in FIG. 5, the inner recess 430 constitutes a first suction recess 431 constituting the first suction port 2, a second suction recess 432 constituting the second suction port 3, and a first discharge port 4. It has a first discharge recess 433 and a second discharge recess 434 that constitutes the second discharge port 5. When viewed in the direction of the rotation axis, the first suction recess 431 and the second suction recess 432 are formed so as to be point-symmetric with respect to the center of rotation C, and the first discharge recess 433 and the second discharge. The recess 434 is formed so as to be point-symmetric with respect to the center of rotation C. Further, the first suction recess 431 and the second suction recess 432 are recessed over the entire area of the inner end surface 43 in the radial direction of rotation, and are recessed from the inner end surface 43 by a predetermined angle in the circumferential direction. The first discharge recess 433 and the second discharge recess 434 are recessed from the inner end surface 43 by a predetermined range from the inner peripheral surface 42 of the cam ring to the outer peripheral surface 41 of the cam ring in the radial direction of rotation, and are predetermined in the circumferential direction. It is recessed from the inner end face 43 by an angle.

The outer recess 440 includes a first suction recess 441 that constitutes the first suction port 2 and a second suction recess 442 that constitutes the second suction port 3, as shown in the other side view shown in FIG. It has a first discharge recess 443 that constitutes the first discharge port 4 and a second discharge recess 444 that constitutes the second discharge port 5. When viewed in the direction of the rotation axis, the first suction recess 441 and the second suction recess 442 are formed so as to be point-symmetric with respect to the center of rotation C, and the first discharge recess 443 and the second discharge. The recess 444 is formed so as to be point-symmetric with respect to the center of rotation C. Further, the first suction recess 441 and the second suction recess 442 are recessed over the entire area of the outer end surface 44 in the radial direction of rotation, and are recessed from the outer end surface 44 by a predetermined angle in the circumferential direction. The first discharge recess 443 and the second discharge recess 444 are recessed from the outer end surface 44 by a predetermined range from the inner peripheral surface 42 of the cam ring to the outer peripheral surface 41 of the cam ring in the radial direction of rotation, and are predetermined in the circumferential direction. It is recessed from the outer end face 44 by an angle.

Further, when viewed in the direction of the rotation axis, the first suction recess 431 and the first suction recess 441 are provided at the same position, and the second suction recess 432 and the second suction recess 442 are provided at the same position. Has been done. The second suction recess 432 and the second suction recess 442 are provided from about 20 degrees to about 90 degrees in the counterclockwise rotation direction when the positive vertical axis in the one-way view shown in FIG. 5 is zero. The first suction recess 431 and the first suction recess 441 are provided from about 200 degrees to about 270 degrees.
Further, when viewed in the direction of the rotation axis, the first discharge recess 433 and the first discharge recess 443 are provided at the same position, and the second discharge recess 434 and the second discharge recess 444 are provided at the same position. Has been done. The second discharge recess 434 and the second discharge recess 444 are provided from about 130 degrees to about 175 degrees in the counterclockwise rotation direction when the positive vertical axis in the one-way view shown in FIG. 5 is zero. The first discharge recess 433 and the first discharge recess 443 are provided from about 310 degrees to about 355 degrees.
Further, the cam ring 40 is formed with two first discharge through holes 45, which are holes penetrating in the rotation axis direction so as to communicate the first discharge recess 433 and the first discharge recess 443. Further, the cam ring 40 is formed with two second discharge through holes 46, which are holes penetrating in the rotation axis direction so as to communicate the second discharge recess 434 and the second discharge recess 444.

Further, the cam ring 40 communicates the inner end surface 43 between the first suction recess 431 and the second discharge recess 434 and the outer end surface 44 between the first suction recess 441 and the second discharge recess 444. A first through hole 47, which is a hole that penetrates in the direction of the rotation axis, is formed therein. Further, the cam ring 40 communicates the inner end surface 43 between the second suction recess 432 and the first discharge recess 433 and the outer end surface 44 between the second suction recess 442 and the first discharge recess 443. A second through hole 48, which is a hole that penetrates in the direction of the rotation axis, is formed therein.

<Structure of inner plate 50>
FIG. 7 is a view of the inner plate 50 viewed in one direction and the other direction in the rotation axis direction.
The inner plate 50 is a disk-shaped member having a through hole formed in the central portion in an approximate shape, and is an inner outer peripheral surface 51, an inner inner peripheral surface 52, and an inner end surface on the cam ring 40 side in the rotation axis direction. It has a cam ring side end surface 53 and an inner non-cam ring side end surface 54 which is an end surface on the side opposite to the cam ring 40 side in the rotation axis direction.
The inner outer peripheral surface 51 has a circular shape as shown in FIG. 7 when viewed in the direction of the rotation axis, and the distance from the rotation center C is the distance from the rotation center C on the cam ring outer peripheral surface 41 of the cam ring 40. It is almost the same.
The inner inner peripheral surface 52 has a circular shape as shown in FIG. 7 when viewed in the direction of the rotation axis, and the distance from the rotation center C is the spline 21 formed on the inner peripheral surface of the rotor 20 (FIG. 7). It is substantially the same as the distance to the groove bottom (see 5).

The inner plate 50 has an inner cam ring side recess 530 composed of a plurality of recesses recessed from the inner cam ring side end surface 53 and an inner non-cam ring side recess 540 composed of a plurality of recesses recessed from the inner non cam ring side end surface 54. And are formed.

The inner cam ring side recess 530 is formed at a position facing the first suction recess 431 of the cam ring 40 to form the first suction port 2, and a position facing the second suction recess 432 of the cam ring 40. It has a second suction recess 532 formed in the above to form the second suction port 3. The first suction recess 531 and the second suction recess 532 are formed so as to be point-symmetric with respect to the rotation center C.
The first suction recess 531 has a first suction inner portion 538 that constitutes a portion of the first suction port 2 on the rotation center C side. The second suction recess 532 has a second suction inner portion 539 that constitutes a portion of the second suction port 3 on the rotation center C side. The first suction inner portion 538 and the second suction inner portion 539 will be described in detail later.

Further, the inner cam ring side recess 530 has a second discharge recess 533 formed at a position facing the second discharge recess 434 of the cam ring 40.
Further, the inner cam ring side recess 530 is located at a position corresponding to the second suction recess 532 to the second discharge recess 533 in the circumferential direction, and faces the columnar groove 232 of the vane groove 23 of the rotor 20 in the radius of gyration direction. The inner second recess 534 is provided at the position where the inner second recess is formed.
Further, the inner cam ring side recess 530 is located at a position corresponding to the first discharge recess 433 in the circumferential direction, and the inner first is located at a position facing the columnar groove 232 of the vane groove 23 of the rotor 20 in the radius of gyration direction. It has a recess 535.
Further, the inner cam ring side recess 530 includes a first recess 536 formed at a position facing the first through hole 47 of the cam ring 40 and a second recess 537 formed at a position facing the second through hole 48. Have.

The inner non-cam ring side recess 540 is formed on the outer peripheral portion and is a groove into which the outer peripheral side O-ring 57 (see FIG. 3) is fitted. It has an inner peripheral side groove 542, which is a groove into which (see 3) is fitted. The outer peripheral side O-ring 57 and the inner peripheral side O-ring 58 seal the gap between the inner plate 50 and the case 110.

Further, the inner plate 50 is formed with a first discharge through hole 55 which is a hole penetrating in the rotation axis direction at a position facing the first discharge recess 443 of the cam ring 40. The opening on the cam ring 40 side of the first discharge through hole 55 and the opening of the second discharge recess 533 are formed so as to be point-symmetric with respect to the rotation center C.
Further, the inner plate 50 is located at a position corresponding to the first suction recess 531 in the circumferential direction and at a position facing the columnar groove 232 of the vane groove 23 of the rotor 20 in the radial direction of rotation in the rotation axis direction. The inner first through hole 56, which is a hole that penetrates the inside, is formed.

<Structure of outer plate 60>
FIG. 8 is a view of the outer plate 60 viewed in the other direction in the rotation axis direction and in one direction.
The outer plate 60 is a plate-shaped member having a through hole formed in the central portion in an approximate shape, and is an outer cam ring which is an outer outer peripheral surface 61, an outer inner peripheral surface 62, and an end surface on the cam ring 40 side in the rotation axis direction. It has a side end surface 63 and an outer non-cam ring side end surface 64 which is an end surface on the side opposite to the cam ring 40 side in the rotation axis direction.
When viewed in the direction of the rotation axis, the outer outer peripheral surface 61 has a shape in which two points are cut out from the circular shape of the base, as shown in FIG. The distance from the circular rotation center C of the base is substantially the same as the distance from the rotation center C on the outer peripheral surface 41 of the cam ring of the cam ring 40. The two notches are formed at positions facing the first suction recess 441 and facing the first suction notch 611 forming the first suction port 2 and the second suction recess 442. It has a second suction notch 612 that constitutes the second suction port 3. The outer outer peripheral surface 61 is formed so as to be point-symmetric with respect to the rotation center C, and the first suction notch portion 611 and the second suction notch portion 612 are point-symmetric with respect to the rotation center C. It is formed to be.
The first suction notch portion 611 has a first suction inner portion 613 that constitutes a portion of the first suction port 2 on the rotation center C side. The second suction notch portion 612 has a second suction inner portion 614 that constitutes a portion of the second suction port 3 on the rotation center C side. The first suction inner portion 613 and the second suction inner portion 614 will be described in detail later.
The outer inner peripheral surface 62 has a circular shape as shown in FIG. 8 when viewed in the direction of the rotation axis, and the distance from the rotation center C is the groove of the spline 21 formed on the inner peripheral surface of the rotor 20. It is almost the same as the distance to the bottom.

The outer plate 60 is formed with an outer cam ring side recess 630 formed of a plurality of recesses recessed from the outer cam ring side end surface 63.
The outer cam ring side recess 630 has a first discharge recess 631 formed at a position facing the first discharge recess 443 of the cam ring 40.
Further, the outer cam ring side recess 630 is a position corresponding to the first suction notch 611 to the first discharge recess 631 in the circumferential direction, and the columnar groove 232 of the vane groove 23 of the rotor 20 in the radial direction. The outer first recess 632 is provided at a position facing the outer surface.
Further, the outer cam ring side recess 630 is located at a position corresponding to the second discharge recess 444 of the cam ring 40 in the circumferential direction, and at a position facing the columnar groove 232 of the vane groove 23 of the rotor 20 in the radius of gyration direction. It has an outer second recess 633.
Further, the outer cam ring side recess 630 is parallel to the rotation axis direction, has a V-shaped cross section cut at a plane orthogonal to the outer outer peripheral surface 61, and has a recess depth from the upstream side to the downstream side in the rotation direction. Has a first V-groove 634 that increases. The downstream end of the first V-groove 634 is connected to the upstream end of the first discharge recess 631.
Further, the outer cam ring side recess 630 is parallel to the rotation axis direction, has a V-shaped cross section cut at a plane orthogonal to the outer outer peripheral surface 61, and has a recess depth from the upstream side to the downstream side in the rotation direction. Has a second V-groove 635 that increases the size. The downstream end of the second V-groove 635 is connected to the upstream end of the second discharge through hole 65.

Further, the outer plate 60 is formed with a second discharge through hole 65, which is a hole penetrating in the rotation axis direction, at a position facing the second discharge recess 444 of the cam ring 40. The opening on the cam ring 40 side of the second discharge through hole 65 and the opening of the first discharge recess 631 are formed so as to be point-symmetric with respect to the rotation center C.
Further, the outer plate 60 rotates at a position corresponding to the second suction notch portion 612 in the circumferential direction and at a position facing the columnar groove 232 of the vane groove 23 of the rotor 20 in the radius of gyration direction. An outer second through hole 66, which is a hole penetrating in the axial direction, is formed.
Further, in the outer plate 60, a first through hole 67, which is a hole penetrating in the rotation axis direction, is located at a position facing the first through hole 47 of the cam ring 40, and is at a position facing the second through hole 48 of the cam ring 40. A second through hole 68, which is a hole penetrating in the direction of the rotation axis, is formed therein.

<Structure of housing 100>
The housing 100 houses the rotor 20, the vane 30, the cam ring 40, the inner plate 50 and the outer plate 60. Further, the housing 100 accommodates one end of the rotating shaft 10 inside, and projects the other end.
The case 110 and the cover 120 are bolted together.

(Structure of case 110)
FIG. 9 is a view of the case 110 viewed in one direction in the rotation axis direction.
The case 110 is a bottomed cylindrical member, and has a case-side bearing 111 that rotatably supports one end of the rotating shaft 10 at the center of the bottom.
Further, the case 110 has an inner plate fitting portion 112 into which the inner plate 50 is fitted. The inner plate fitting portion 112 includes an inner diameter side fitting portion 113 located near the rotation center C (inner diameter side) and an outer diameter side fitting portion 114 located far from the rotation center C (outer diameter side). Have.

As shown in FIG. 3, the inner diameter side fitting portion 113 is provided on the outer diameter side of the case side bearing 111, and covers the inner diameter side covering portion 113a that covers a part of the inner inner peripheral surface 52 of the inner plate 50. And an inner diameter side suppressing portion 113b that suppresses the inner plate 50 from moving to the bottom side. The inner diameter side covering portion 113a has a circular shape in which the distance from the rotation center C is smaller than the distance from the rotation center C on the inner inner peripheral surface 52 when viewed in the direction of the rotation axis. The inner diameter side suppressing portion 113b is a donut-shaped surface orthogonal to the rotation axis direction, and the distance from the rotation center C in the inner circle is the same as the distance from the rotation center C in the inner diameter side covering portion 113a, and is on the outer side. The distance from the rotation center C in the circle is smaller than the distance from the rotation center C in the inner inner peripheral surface 52.

As shown in FIG. 3, the outer diameter side fitting portion 114 has an outer diameter side covering portion 114a that covers a part of the inner outer peripheral surface 51 of the inner plate 50 and the inner plate 50 moving to the bottom side. It has an outer diameter side suppressing portion 114b for suppressing. The outer diameter side covering portion 114a has a circular shape in which the distance from the rotation center C is larger than the distance from the rotation center C on the inner outer peripheral surface 51 when viewed in the rotation axis direction. The outer diameter side suppressing portion 114b is a donut-shaped surface orthogonal to the rotation axis direction, and the distance from the rotation center C in the outer circle is the same as the distance from the rotation center C in the outer diameter side covering portion 114a. The distance from the rotation center C in the inner circle is smaller than the distance from the rotation center C in the inner outer peripheral surface 51.

In the inner plate 50, the inner peripheral side O-ring 58 fitted in the inner peripheral side groove 542 of the inner plate 50 abuts on the inner diameter side suppressing portion 113b, and the outer peripheral side O-ring 57 fitted in the outer peripheral side groove 541 suppresses the outer diameter side. It is inserted on the bottom side until it hits the portion 114b. Then, the inner peripheral side O-ring 58 comes into contact with the inner peripheral side groove 542 of the inner plate 50, the inner diameter side covering portion 113a and the inner diameter side suppressing portion 113b of the case 110, and the outer peripheral side O-ring 57 is the outer circumference of the inner plate 50. The case 110 and the inner plate 50 are sealed by contacting the side groove 541, the outer diameter side covering portion 114a of the case 110, and the outer diameter side suppressing portion 114b. As a result, the space S1 on the opening side of the inner plate fitting portion 112 and the space S2 on the bottom side of the inner plate fitting portion 112 in the case 110 are partitioned. The space S1 on the opening side of the inner plate fitting portion 112 constitutes a suction flow path R1 through which oil sucked from the first suction port 2 and the second suction port 3 flows. The space S2 on the bottom side of the inner plate fitting portion 112 constitutes a first discharge flow path R2 through which the oil discharged from the first discharge port 4 flows.

Further, in the case 110, apart from the accommodation space for accommodating the rotor 20, the vane 30, the cam ring 40, the inner plate 50, and the outer plate 60, the case 110 is outside the accommodation space in the radial direction of rotation from the opening side to the rotation axis direction. A concave outer concave portion 115 of the case is formed. The case outer recess 115 faces the cover outer recess 123 formed in the cover 120, which will be described later, and constitutes a case second discharge flow path R3 through which the oil discharged from the second discharge port 5 flows.

Further, as shown in FIG. 1, the case 110 is formed with a suction port 116 that communicates the space S1 on the opening side of the inner plate fitting portion 112 with the outside of the case 110. The suction port 116 is a columnar hole formed in the side wall of the case 110, and includes a hole whose direction is orthogonal to the rotation axis direction as the pillar direction. The suction port 116 constitutes a suction flow path R1 through which oil sucked from the first suction port 2 and the second suction port 3 flows.

Further, as shown in FIG. 1, the case 110 is formed with a first discharge port 117 that communicates the space S2 on the bottom side of the inner plate fitting portion 112 with the outside of the case 110. The first discharge port 117 is a columnar hole formed in the side wall of the case 110, and includes a hole whose direction is orthogonal to the rotation axis direction as the pillar direction. The first discharge port 117 constitutes a first discharge flow path R2 through which the oil discharged from the first discharge port 4 flows.

Further, as shown in FIG. 1, the case 110 is formed with a second discharge port 118 that communicates the outer recess 115 of the case with the outside of the case 110. The second discharge port 118 is a columnar hole formed in the side wall of the case outer recess 115 in the case 110, and includes a hole whose direction is orthogonal to the rotation axis direction as the pillar direction. The second discharge port 118 constitutes a case second discharge flow path R3 through which the oil discharged from the second discharge port 5 flows.

(Structure of cover 120)
As shown in FIG. 2, the cover 120 has a cover-side bearing 121 at the center thereof that rotatably supports the rotating shaft 10.
The cover 120 is formed with a cover second discharge recess 122 recessed in the rotation axis direction from the end face on the case 110 side at a position facing the second discharge through hole 65 and the outer second through hole 66 of the outer plate 60. There is.

Further, the cover 120 has a cover outer recess 123 recessed in the rotation axis direction from the end surface on the case 110 side outside the cover second discharge recess 122 in the rotation radial direction, and a cover second discharge recess 122 and a cover outer recess 123. A cover recess connecting portion 124 is formed to connect and to the case 110 side in the other direction in the rotation axis direction from the end surface. The cover outer recess 123 is formed so as to open at a position not facing the above-mentioned accommodation space formed in the case 110, and faces the case outer recess 115. The cover second discharge recess 122, the cover recess connection portion 124, and the cover outer recess 123 form a cover second discharge flow path R4 (see FIG. 4) through which the oil discharged from the second discharge port 5 flows. The oil discharged from the second discharge port 5 flows into the case second discharge flow path R3 via the cover recess connection portion 124, and also flows into the outer second through hole 66 through the cover second discharge recess 122. ..

Further, the cover 120 has a portion of the outer plate 60 facing the first suction cutout portion 611 and the second suction cutout portion 612, and a space S1 on the opening side of the inner plate fitting portion 112 of the case 110. A cover suction recess 125 recessed in the rotation axis direction from the end surface on the case 110 side is formed at a portion of the cam ring 40 facing the outer space in the radial direction of the cam ring with respect to the outer peripheral surface 41 of the cam ring.
The cover suction recess 125 constitutes a suction flow path R1 in which oil sucked from the suction port 116 and sucked into the pump chamber from the first suction port 2 and the second suction port 3 flows.

Further, the cover 120 has a first cover recess 127 and a second cover recessed in the rotation axis direction from the end face on the case 110 side at positions facing each of the first through hole 67 and the second through hole 68 of the outer plate 60. A recess 128 is formed.

<Action of vane pump 1>
The vane pump 1 according to the present embodiment has 10 vanes 30, and when the 10 vanes 30 come into contact with the inner peripheral surface 42 of the cam ring of the cam ring 40, the two adjacent vanes 30 are adjacent to each other. The outer peripheral surface of the rotor 20 between the two vanes 30, the inner peripheral surface 42 of the cam ring between the two adjacent vanes 30, the inner cam ring side end surface 53 of the inner plate 50, and the outer cam ring side end surface 63 of the outer plate 60. It has 10 pump chambers to be formed. Focusing on one pump chamber, the rotating shaft 10 makes one rotation and the rotor 20 makes one rotation, so that the pump chamber makes one rotation around the rotating shaft 10. In the process of one rotation of the pump chamber, the oil sucked from the first suction port 2 is compressed to increase the pressure and discharged from the first discharge port 4, and the oil sucked from the second suction port 3 is compressed. The pressure is increased to discharge from the second discharge port 5.

<About the shape of the inner part of the suction>
FIG. 10 is a view of the cam ring 40 and the inner plate 50 viewed in the other direction. However, in FIG. 10, the first suction inner portion 538 is mainly shown as a diagram of the inner plate 50.
FIG. 11 is a cross-sectional view of the XI-XI portion of FIG.
FIG. 12 is a perspective view of the rotor 20, the plurality of vanes 30, the cam ring 40, and the outer plate 60.

The first suction inner portion 538 and the second suction inner portion 539 of the inner plate 50, and the first suction inner portion 613 and the second suction inner portion 614 of the outer plate 60 have substantially the same shape. Collectively, it may be referred to as "inhalation inner part 710". Further, in the following description, when it is not necessary to distinguish between the first suction port 2 and the second suction port 3, the first suction port 2 and the second suction port 3 are collectively referred to as a “suction port”. In some cases.

The suction inner portion 710 includes a suction inner main body portion 711 that follows the shape of the curved surface portion 22 of the rotor 20, and a suction inner recess 712 as an example of a second recess that is recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. have. Further, the suction inner side portion 710 has a suction inner intermediate portion 713 which is a portion between the suction inner main body portion 711 and the suction inner recessed portion 712.
The suction inner main body portion 711 has an arc shape centered on the rotation center C, and the distance from the rotation center C is the same as the distance from the rotation center C to the curved surface portion 22 of the rotor 20.

The suction inner recess 712 is formed so as to connect to the upstream end (upstream end) of the suction port. Here, the rotation angle that is the upstream end (upstream end) of the suction port is, in terms of the first suction port 2, the first suction recess 431 and the first suction recess 431 formed in the cam ring 40 constituting the first suction port 2. Since the rotation angles of the first suction recess 441, the first suction recess 531 formed in the inner plate 50, and the upstream end of the first suction notch 611 formed in the outer plate 60 are all the same, these It is the rotation angle of the upstream end of the part. That is, the suction inner recess 712 in the first suction recess 531 is formed so as to connect to the upstream end of the first suction recess 531 formed in the inner plate 50.
The most recessed portion of the suction inner recess 712 on the rotation center C side is the same distance as the distance from the rotation center C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

The suction inner intermediate portion 713 has a shape that follows the shape of the inner peripheral surface of the cam ring 40. That is, the distance from the rotation center C for each rotation angle in the suction inner intermediate portion 713 is shorter by a predetermined distance from the distance L from the rotation center C for each rotation angle on the cam ring inner peripheral surface 42 of the cam ring 40.
The suction inner recess 712 and the upstream end of the suction port are connected by a curved surface having a predetermined radius, and the suction inner main body portion 711 and the suction inner intermediate portion 713 are connected by a curved surface having a predetermined radius. Further, the suction inner main body portion 711 and the downstream end of the suction port are connected by a curved surface having a predetermined radius.

Hereinafter, the advantages of the vane pump 1 according to the present embodiment will be described in comparison with the comparative configuration.
As the vane pump according to the comparative configuration, consider a configuration in which a concave portion recessed from the curved surface portion 22 toward the rotation center C side is formed over the entire rotation axis direction with respect to the vane pump 1 according to the present embodiment.
In the vane pump 1 according to the present embodiment, the curved surface portion 22 formed between the two adjacent vane grooves 23 has an arc shape centered on the rotation center C, and therefore, as compared with the vane pump according to the comparative configuration. The volume of the pump chamber is small. The vane pump according to the comparative configuration has a larger volume of the pump chamber than the vane pump 1 according to the present embodiment because of the concave portion recessed from the curved surface portion 22 toward the rotation center C side over the entire rotation axis direction.

Therefore, the amount of oil sucked into the pump chamber of the vane pump 1 according to the present embodiment is smaller than the amount of oil sucked into the pump chamber of the vane pump according to the comparative configuration. As a result, in the vane pump 1 according to the present embodiment, the absolute amount of air bubbles (air) contained in the oil sucked into the pump chamber is smaller than the air bubbles sucked into the pump chamber of the vane pump according to the comparative configuration. When a large amount of air bubbles are sucked into the pump chamber, a sound is generated when the air bubbles are crushed in the subsequent process. Further, a sound is generated when the bubbles sucked into the pump chamber split or when the split bubbles collide with the inner peripheral surface of the cam ring 40 or the like. In addition, the amount of air bubbles sucked into the pump chamber reduces the amount of oil other than bubbles that can be sucked into the pump chamber compared to the volume of the pump chamber. The suction / discharge efficiency may decrease or the discharge pressure may fluctuate. According to the vane pump 1 according to the present embodiment, the absolute amount of air bubbles sucked into the pump chamber can be reduced as compared with the vane pump according to the comparative configuration, so that the suction discharge efficiency is lowered, the discharge pressure is shaken, and noise is generated. Can be suppressed.

Further, in the vane pump 1 according to the present embodiment, rotor recesses 24 recessed from the curved surface portion 22 toward the rotation center C side are formed at both ends of the rotor 20 in the rotation axis direction. Since the rotor recess 24 is formed, it becomes easier to suck oil into the pump chamber than in a configuration in which the rotor recess 24 is not formed. Therefore, the amount of oil sucked into the pump chamber can be increased as compared with the configuration in which the rotor recess 24 is not formed, so that the suction efficiency can be improved. As a result, it is possible to prevent the amount of oil that can be sucked into the pump chamber from being excessively reduced due to the shape of the outer peripheral portion of the rotor 20 being the arcuate curved surface portion 22 centered on the rotation center C. Can be done.

Further, the rotor recess 24 formed in the rotor 20 is a portion of the cam ring 40 facing the first suction recess 431 and the first suction recess 441, that is, the first suction recess 431 and the first suction recess 431, which constitute the suction port. Each of the 441s is formed at the end in the direction of the rotation axis. Therefore, the rotor recess 24 sucks into the pump chamber as compared with the case where the rotor recess 24 is formed in the central portion in the rotation axis direction, which does not face, for example, the first suction recess 431 and the first suction recess 441 of the cam ring 40. The amount of oil increases.
Further, the size of the rotor recess 24 in the rotation axis direction is smaller than the size of the cam ring 40 in the first suction recess 431 and the first suction recess 441 in the rotation axis direction. As a result, while reducing the absolute amount of air sucked into the pump chamber, the shape of the outer peripheral portion of the rotor 20 is made into an arcuate curved surface portion 22 centered on the rotation center C, so that the suction efficiency is lowered. It can be suppressed to overdo it.

Further, in the vane pump 1 according to the present embodiment, the rotor recess 24 formed in the rotor 20 is formed in the central portion of the curved surface portion 22 of the rotor 20 in the circumferential direction, and is formed around the vane groove 23. Is not formed. Therefore, the area of the portion of the rotor 20 that supports the vane 30 is larger than that of the rotor recess 24 that is also formed around the vane groove 23. As a result, even if the vane 30 is pushed by the high-pressure oil flowing into the columnar groove 232 of the vane groove 23, the vane 30 is supported over a wide range by the rotor 20, so that the vane 30 is suppressed from falling. be able to.

Further, in the vane pump 1 according to the present embodiment, the suction inner portion 710 of the suction port (the first suction inner portion 538 and the second suction inner portion 539 of the inner plate 50, the first suction inner portion 613 of the outer plate 60, and the like. The second suction inner portion 614) is formed with a suction inner recess 712 recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. Due to this shape, for example, the opening area of the suction port is formed as compared with a configuration in which the suction inner main body portion 711 of the suction inner portion 710 is formed over the entire circumferential direction of the suction inner portion 710 and the suction inner recess 712 is not formed. Becomes larger. As a result, according to the vane pump 1 according to the present embodiment, the suction efficiency can be improved as compared with the vane pump having the suction inner portion 710 in which the suction inner recess 712 is not formed.

Further, in the vane pump 1 according to the present embodiment, the suction inner recess 712 is formed so as to be connected to the upstream end of the suction port. Therefore, the opening area of the suction port can be increased when the volume starts to increase at the initial stage of the suction stroke in the pump chamber. As a result, according to the vane pump 1 according to the present embodiment, the amount of oil sucked can be increased, so that the suction efficiency can be improved.
Further, at the downstream end of the suction port where the amount of protrusion of the vane 30 from the vane groove 23 formed in the rotor 20 is large, the distance from the rotation center C is the same as the distance to the curved surface portion 22 of the rotor 20 inside the suction port. Since the main body portion 711 supports the end portion of the vane 30, the fall of the vane 30 can be suppressed.

<Second embodiment>
FIG. 13 is a diagram showing a schematic configuration of a suction inner portion 720 of the vane pump 702 according to the second embodiment.
The vane pump 702 according to the second embodiment has a suction inner portion 720 corresponding to the suction inner portion 710 of the vane pump 1 according to the first embodiment with respect to the vane pump 1 according to the first embodiment. The point is different. Hereinafter, the differences from the vane pump 1 according to the first embodiment will be described. The vane pump 702 according to the second embodiment and the vane pump 1 according to the first embodiment are designated by the same reference numerals and have the same shape and function, and detailed description thereof will be omitted.

The suction inner side portion 720 has a suction inner main body portion 721 that follows the shape of the curved surface portion 22 of the rotor 20, and a suction inner recess 722 that is recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. Further, the suction inner side portion 720 has a suction inner intermediate portion 723 which is a portion between the suction inner main body portion 721 and the suction inner concave portion 722.
The suction inner recess 722 is formed so as to connect to the downstream end (downstream end) of the suction port. Here, the rotation angle at the downstream end (downstream end) of the suction port is, in terms of the first suction port 2, the first suction recess 431 and the first suction recess 431 formed in the cam ring 40 constituting the first suction port 2. Since the rotation angles of the first suction recess 441, the first suction recess 531 formed in the inner plate 50, and the downstream end of the first suction notch 611 formed in the outer plate 60 are all the same, these It is the rotation angle of the downstream end of the part. That is, the suction inner recess 722 in the first suction recess 531 is formed so as to connect to the downstream end of the first suction recess 531 formed in the inner plate 50.
The most recessed portion of the suction inner recess 722 toward the rotation center C is the same distance as the distance from the rotation center C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

The suction inner intermediate portion 723 is formed so as to connect the central portion 724 between the upstream end and the downstream end of the suction inner portion 720 and the suction inner recess 722 in the suction inner main body portion 721.
The suction inner recess 722 and the downstream end of the suction port are connected by a curved surface having a predetermined radius, and the suction inner main body portion 721 and the suction inner intermediate portion 723 are connected by a curved surface having a predetermined radius. Further, the suction inner main body portion 721 and the upstream end of the suction port are connected by a curved surface having a predetermined radius.

In the vane pump 702 according to the second embodiment, the suction inner portion 720 of the suction port (the first suction inner portion 538 and the second suction inner portion 539 of the inner plate 50, the first suction inner portion 613 and the first suction inner portion of the outer plate 60). 2 The suction inner recess 722) is formed in the suction inner recess 614), which is recessed toward the rotation center C side of the curved surface 22 of the rotor 20. Due to this shape, for example, the opening area of the suction port is formed as compared with a configuration in which the suction inner main body portion 721 of the suction inner portion 720 is formed over the entire circumferential direction of the suction inner portion 720 and the suction inner recess 722 is not formed. Becomes larger. As a result, according to the vane pump 702 according to the second embodiment, the suction efficiency can be improved as compared with the vane pump in which the suction inner recess 722 is not formed.

Further, in the vane pump 702 according to the second embodiment, the suction inner recess 722 is formed so as to be connected to the downstream end of the suction port. Therefore, the opening area of the suction port can be increased when the volume of the pump chamber is substantially maximized. As a result, according to the vane pump 702 according to the second embodiment, the amount of oil sucked can be increased, so that the suction efficiency can be improved.

<Third embodiment>
FIG. 14 is a diagram showing a schematic configuration of a suction inner portion 730 of the vane pump 703 according to the third embodiment.
The vane pump 703 according to the third embodiment has a suction inner portion 730 corresponding to the suction inner portion 710 of the vane pump 1 according to the first embodiment with respect to the vane pump 1 according to the first embodiment. The point is different. Hereinafter, the differences from the vane pump 1 according to the first embodiment will be described. The vane pump 703 according to the third embodiment and the vane pump 1 according to the first embodiment are designated by the same reference numerals with the same shape and function, and detailed description thereof will be omitted.

In the suction inner portion 730 according to the third embodiment, the suction inner recess 732 which is recessed most toward the rotation center C side is formed at the central portion between the upstream end and the downstream end of the suction inner portion 730. It is different from the suction inner part 710 according to the first embodiment and the suction inner part 720 according to the second embodiment. The most recessed portion of the suction inner recess 732 on the rotation center C side is the same distance as the distance from the rotation center C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

Further, the suction inner portion 730 connects the upstream point 734, which is a portion of the upstream end of the suction inner portion 730, which is the same distance as the distance from the rotation center C to the curved surface portion 22 of the rotor 20, and the suction inner recess 732. It has an upstream connection portion 735. Further, the suction inner portion 730 connects the downstream point 736, which is a portion of the downstream end of the suction inner portion 730, which is the same distance as the distance from the rotation center C to the curved surface portion 22 of the rotor 20, and the suction inner recess 732. It has a downstream connection portion 737.
The upstream side connecting portion 735 and the upstream end of the suction port are connected by a curved surface having a predetermined radius, and the downstream connecting portion 737 and the downstream end of the suction port are connected by a curved surface having a predetermined radius.

In the vane pump 703 according to the third embodiment, the suction inner portion 730 of the suction port (the first suction inner portion 538 and the second suction inner portion 539 of the inner plate 50, the first suction inner portion 613 and the first suction inner portion of the outer plate 60). 2 The suction inner recess 732) is formed in the suction inner recess 614), which is recessed toward the rotation center C side of the curved surface 22 of the rotor 20. Due to this shape, for example, the opening area of the suction port becomes larger than the configuration in which the entire circumferential direction of the suction inner portion 730 is formed to be the same distance as the distance from the rotation center C to the curved surface portion 22 of the rotor 20. .. As a result, according to the vane pump 703 according to the third embodiment, the suction efficiency can be improved as compared with the vane pump in which the suction inner recess 732 is not formed.

Further, in the vane pump 703 according to the third embodiment, the suction inner recess 732 is formed at the central portion in the circumferential direction of the suction inner portion 730 of the suction port. Therefore, it is possible to increase the opening area of the suction port when the rotor 20 is rotated by about 7 degrees to about 45 degrees after the volume of the pump chamber starts to increase. As a result, after the volume of the pump chamber starts to increase, for example, in a region where the rotation speed of the rotor 20 is high, the suction port does not start sucking oil until after the rotor 20 has rotated about 5 degrees. Since the opening area of the can be increased, the inhalation efficiency can be improved.
Further, at the downstream end of the suction port where the amount of protrusion of the vane 30 from the vane groove 23 formed in the rotor 20 is large, the distance from the rotation center C gradually increases from the upstream end side to the downstream end. The end portion of the vane 30 can be easily supported, and the vane 30 can be prevented from falling.

<Fourth Embodiment>
FIG. 15 is a diagram showing a schematic configuration of a suction inner portion 740 of the vane pump 704 according to the fourth embodiment.
The vane pump 704 according to the fourth embodiment has a suction inner portion 740 corresponding to the suction inner portion 710 of the vane pump 1 according to the first embodiment with respect to the vane pump 1 according to the first embodiment. The point is different. Hereinafter, the differences from the vane pump 1 according to the first embodiment will be described. The vane pump 704 according to the fourth embodiment and the vane pump 1 according to the first embodiment are designated by the same reference numerals with the same shape and function, and detailed description thereof will be omitted.

In the suction inner portion 740 according to the fourth embodiment, the portion corresponding to the suction inner recess 712 of the suction inner portion 710 according to the first embodiment covers the entire portion of the portion on the rotation center C side of the suction port. It is different from the suction inner portion 710 according to the first embodiment in that it is formed over the above. That is, in the suction inner portion 740 according to the fourth embodiment, the portions corresponding to the suction inner main body portion 711 and the suction inner intermediate portion 713 are not provided.

That is, the suction inner portion 740 according to the fourth embodiment has an arc shape centered on the rotation center C, and the distance from the rotation center C is from the rotation center C to the minimum diameter of the rotor recess 24 of the rotor 20. It has a suction inner recess 742 that is the same as the distance. The suction inner recess 742 is formed over the entire circumferential direction from the upstream end to the downstream end of the suction port.
The suction inner recess 742 and the upstream end of the suction port are connected by a curved surface having a predetermined radius, and the suction inner recess 742 and the downstream end of the suction port are connected by a curved surface having a predetermined radius.

In the vane pump 704 according to the fourth embodiment, the suction inner portion 740 of the suction port (first suction inner portion 538 and second suction inner portion 539 of the inner plate 50, first suction inner portion 613 and the first suction inner portion of the outer plate 60). 2 The suction inner recess 742) is formed in the suction inner recess 614), which is recessed toward the rotation center C side of the curved surface 22 of the rotor 20. Due to this shape, for example, the opening area of the suction port becomes larger than the configuration in which the entire circumferential direction of the suction inner portion 740 is formed to be the same distance as the distance from the rotation center C to the curved surface portion 22 of the rotor 20. .. As a result, according to the vane pump 704 according to the fourth embodiment, the suction efficiency can be improved as compared with the vane pump in which the suction inner recess 742 is not formed.

Further, in the vane pump 704 according to the fourth embodiment, the suction inner recess 742 is formed over the entire circumferential direction from the upstream end to the downstream end of the suction port. Therefore, for example, the opening area of the suction port can be increased as compared with the configuration in which the suction inner recess 742 is formed in a part in the circumferential direction, so that the suction efficiency can be improved.

In the first to fourth embodiments described above, the most recessed portion on the rotation center C side in the suction inner recess (for example, the suction inner recess 722) of the suction inner portion (for example, the suction inner portion 710). Is the same distance as the distance from the rotation center C to the end portion of the rotor recess 24 of the rotor 20 in the rotation axis direction, but is not particularly limited to such a mode. The portion of the suction inner recess that is most recessed toward the rotation center C may be recessed from the rotation center C toward the rotation center C side of the rotor recess 24 of the rotor 20. As a result, the opening area of the suction port becomes larger, so that the suction efficiency is improved.

<Fifth Embodiment>
The vane pump 705 according to the fifth embodiment is the first discharge port 4 or the second discharge port in the inner plate 50 and the outer plate 60 with respect to the vane pump according to the first to fourth embodiments described above. The difference is that the portion constituting 5 is recessed toward the rotation center C side with respect to the curved surface portion 22 of the rotor 20. Hereinafter, the differences from the vane pumps according to the first to fourth embodiments will be described. The vane pump 705 according to the fifth embodiment and the vane pumps according to the first to fourth embodiments have the same shape and function, and the same reference numerals are given, and detailed description thereof will be omitted.

FIG. 16 is a view of the inner plate 850 according to the fifth embodiment as viewed in one direction and the other direction in the rotation axis direction.
The first discharge through hole 855 of the inner plate 850 according to the fifth embodiment has a first discharge inner portion 858 that constitutes a portion of the first discharge port 4 on the rotation center C side. Further, the second discharge recess 853 of the inner plate 850 has a second discharge inner portion 859 that constitutes a portion of the second discharge port 5 on the rotation center C side.

FIG. 17 is a view of the outer plate 860 according to the fifth embodiment as viewed in the other direction in the rotation axis direction and in one direction.
The first discharge recess 863 of the outer plate 860 according to the fifth embodiment has a first discharge inner portion 868 that constitutes a portion of the first discharge port 4 on the rotation center C side. Further, the second discharge through hole 865 of the outer plate 860 has a second discharge inner portion 869 forming a portion on the rotation center C side of the second discharge port 5.

The first discharge inner portion 858 and the second discharge inner portion 859 of the inner plate 850, and the first discharge inner portion 868 and the second discharge inner portion 869 of the outer plate 860 have substantially the same shape. Collectively, it may be referred to as "discharge inner portion 800". Further, in the following description, when it is not necessary to distinguish between the first discharge port 4 and the second discharge port 5, the first discharge port 4 and the second discharge port 5 are collectively referred to as a “discharge port”. In some cases.

FIG. 18 is a view of the cam ring 40 and the inner plate 850 viewed in the other direction.
The discharge inner portion 800 includes a discharge inner main body portion 801 that follows the shape of the curved surface portion 22 of the rotor 20, and a discharge inner recess 802 as an example of a second recess that is recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. have. Further, the discharge inner portion 800 has a discharge inner intermediate portion 803 which is a portion between the discharge inner main body portion 801 and the discharge inner recess 802.
The discharge inner main body portion 801 has an arc shape centered on the rotation center C, and the distance from the rotation center C is the same as the distance from the rotation center C to the curved surface portion 22 of the rotor 20.

The discharge inner recess 802 is formed so as to be connected to the upstream end (upstream end) of the discharge port. Here, the rotation angle at the upstream end (upstream end) of the discharge port is, in terms of the first discharge port 4, the first discharge recess 433 formed in the cam ring 40 constituting the first discharge port 4 and the first discharge recess 433. Since the rotation angles of the first discharge recess 443, the first discharge through hole 855 formed in the inner plate 850, and the upstream end of the first discharge recess 863 formed in the outer plate 60 are all the same, these parts are formed. It is the rotation angle of the upstream end of. That is, the discharge inner recess 802 in the first discharge inner portion 858 is formed so as to be connected to the upstream end of the first discharge through hole 855 formed in the inner plate 50.
The most recessed portion of the discharge inner recess 802 on the rotation center C side is the same distance as the distance from the rotation center C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

The discharge inner intermediate portion 803 is formed so as to connect the central portion 804 between the upstream end and the downstream end of the discharge inner portion 800 and the discharge inner recess 802 in the discharge inner main body portion 801.
The discharge inner recess 802 and the upstream end of the discharge port are connected by a curved surface having a predetermined radius, and the discharge inner main body 801 and the discharge inner intermediate portion 803 are connected by a curved surface having a predetermined radius. Further, the discharge inner main body 801 and the downstream end of the discharge port are connected by a curved surface having a predetermined radius.

In the vane pump 705 according to the fifth embodiment, the discharge inner portion 800 of the discharge port (the first discharge inner portion 858 and the second discharge inner portion 859 of the inner plate 850, the first discharge inner portion 868 and the first discharge inner portion 860 of the outer plate 860). 2 Discharge inner portion 869) is formed with a discharge inner recess 802 recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. Due to this shape, for example, the opening area of the discharge port is formed as compared with a configuration in which the discharge inner main body portion 801 of the discharge inner portion 800 is formed over the entire circumferential direction of the discharge inner portion 800 and the discharge inner recess 802 is not formed. Becomes larger. As a result, according to the vane pump 705 according to the fifth embodiment, the discharge efficiency can be improved as compared with the vane pump having the discharge inner portion 800 in which the discharge inner recess 802 is not formed. That is, since the opening area of the discharge port at the initial stage of the discharge stroke is large, the discharge pressure can be reduced from the initial stage of the discharge stroke. Therefore, it is possible to suppress the backflow of oil from the discharge port to the pump chamber, and it is possible to discharge more oil from the initial stage of the discharge stroke. Therefore, even if the oil in the pump chamber contains air bubbles (air), it becomes easy to completely discharge the air bubbles (air). As a result, more oil can be inhaled in the inhalation stroke after the discharge stroke.

In the fifth embodiment described above, the most recessed portion of the discharge inner recess 802 of the discharge inner portion 800 toward the rotation center C is the end in the rotation axis direction from the rotation center C to the rotor recess 24 of the rotor 20. It is the same distance as the distance to the part, but is not particularly limited to such a mode. The portion of the discharge inner recess 802 that is most recessed toward the rotation center C may be recessed from the rotation center C toward the rotation center C side of the rotor recess 24 of the rotor 20 in the rotation axis direction. As a result, the opening area of the discharge port becomes larger, so that the discharge performance is improved.

<Modification example of rotor recess 24>
In the first to fifth embodiments described above, the size of the rotor recess 24 in the rotation axis direction is larger than the size of the cam ring 40 in the first suction recess 431 and the first suction recess 441 in the rotation axis direction. Although small, it is not particularly limited to such an embodiment.

FIG. 19 is a diagram showing a modified example of the rotor recess 24 of the rotor 20.
As shown in FIG. 19, the size of the rotor recess 24 in the rotation axis direction may be larger than the size of the cam ring 40 in the first suction recess 431 and the first suction recess 441 in the rotation axis direction. For example, the size of the rotor recess 24 in the rotation center C direction at the end of the rotor 20 in the rotation axis direction is the same as that of the rotor recess 24 according to the first to fifth embodiments, and the rotor recess 24 It is advisable to increase the size of the in the direction of the rotation axis. As a result, the volume recessed from the curved surface portion 22 toward the rotation center C side becomes larger than that of the rotor 20 according to the first to fifth embodiments. As a result, the amount of oil sucked into the pump chamber can be increased. Therefore, the shape of the outer peripheral portion of the rotor 20 is an arcuate curved surface portion 22 centered on the rotation center C, so that the pump chamber is formed. It is possible to prevent the amount of oil that can be inhaled from decreasing too much.

The rotor recesses 24 formed at both ends of the rotor 20 in the rotation axis direction may be continuous with each other. That is, the ends of both rotor recesses 24 on the outer peripheral surface (curved surface portion 22) side of the rotor 20 may be the same. In other words, the end portion of both rotor recesses 24 on the outer peripheral surface side may be the central portion of the rotor 20 in the rotation axis direction. As a result, the volume recessed from the curved surface portion 22 toward the rotation center C side becomes the largest.

<Modification example of curved surface portion 22>
FIG. 20 is a diagram showing a modified example of the curved surface portion 22 of the rotor 20.
In the first to fifth embodiments described above, the curved surface portion 22 of the rotor 20 is rotated from the curved surface portion 22 so that the two rotor recesses 24 formed at both ends in the rotation axis direction communicate with each other. A communication portion 222 recessed on the center C side may be formed. It can be exemplified that the communication portion 222 is formed so as to extend in the rotation axis direction and is formed at the central portion in the circumferential direction of the curved surface portion 22.
By providing the communication portion 222 that communicates the two rotor recesses 24 with each other, the air that collects on the rotor 20 side during rotation can be guided into the communication portion 222 by centrifugal force, and the air is discharged to the discharge port in the discharge section. Performance can be improved. Further, since the air discharge performance from the pump chamber can be improved, pressure fluctuation and noise generation can be suppressed.

1,702,703,704,705 ... Vane pump, 2 ... 1st suction port, 3 ... 2nd suction port, 4 ... 1st discharge port, 5 ... 2nd discharge port, 10 ... Rotating shaft, 20 ... Rotor, 22 ... curved surface, 24 ... rotor recess, 30 ... vane, 40 ... cam ring, 50 ... inner plate, 60 ... outer plate, 100 ... housing, 110 ... case, 120 ... cover, 710, 720, 730, 740 ... suction inner part , 712, 722, 732, 742 ... Inhalation inner recess, 800 ... Discharge inner part, 802 ... Discharge inner recess

Claims (9)

A first concave portion that receives rotational force from a rotating shaft, rotates while supporting a plurality of vanes, has an arcuate curved surface portion centered on the rotating shaft, and is recessed from the curved surface portion toward the center of rotation. With the rotor on which
A cam ring having an inner peripheral surface facing the curved surface portion of the rotor and arranged so as to surround the rotor,
A second recess is formed in the cam ring so as to cover the opening of the cam ring at one end of the rotation shaft in the axial direction, and is recessed toward the center of rotation of the rotor from the curved surface. One side member and
A vane pump device equipped with. The one-side member is the suction port for sucking a working fluid into a pump chamber partitioned by an outer peripheral surface of the rotor, an inner peripheral surface of the cam ring, and two adjacent vanes among the plurality of vanes. It has an inner part that constitutes a part on the rotation center side, and has an inner part.
The vane pump device according to claim 1, wherein the second recess is a portion of the inner portion recessed toward the center of rotation. The inner portion of the one-side member follows the shape of the curved surface portion of the rotor, and the portion between the portion along the shape of the curved surface portion and the second recess follows the shape of the inner peripheral surface of the cam ring. Item 2. The vane pump device according to item 2. The vane pump device according to claim 2, wherein the second recess of the one-side member is formed in a downstream portion in the circumferential direction in the inner portion. The vane pump device according to claim 2, wherein the second recess of the one-side member is formed at a substantially central portion in the circumferential direction in the inner portion. The second recess formed in the one-side member operates on the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and the pump chamber partitioned by two adjacent vanes among the plurality of vanes. The vane pump device according to claim 1, wherein the suction port for sucking a fluid is formed over the entire area on the rotation center side. It constitutes a suction port that constitutes a suction path for sucking the working fluid into the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and the pump chamber partitioned by the two adjacent vanes in the plurality of vanes. As described above, the cam ring is formed with a third recess recessed in the axial direction of the rotation axis from the mating surface with the one side member.
The vane pump device according to claim 1, wherein the first recess of the rotor is formed at a portion of the cam ring facing the third recess. The vane pump device according to claim 7, wherein the axial size of the rotating shaft in the first recess of the rotor is smaller than the axial size of the rotating shaft in the third recess formed in the cam ring. The one-side member is the discharge port for discharging a working fluid from an outer peripheral surface of the rotor, an inner peripheral surface of the cam ring, and a pump chamber partitioned by two adjacent vanes among the plurality of vanes. It has an inner part that constitutes a part on the rotation center side, and has an inner part.
The vane pump device according to claim 1, wherein the second recess is a portion of the inner portion recessed toward the center of rotation.

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