JP7150870B2 - vane pump device - Google Patents

Description

The present invention relates to a vane pump device.

The vane pump disclosed in Patent Document 1 includes a rotor that rotates coupled to a rotating shaft that is pivotally supported inside a housing, a cam ring that is arranged inside the housing so as to surround the rotor, and a plurality of rotors that extend radially from the rotor. A plurality of vanes slidably disposed in the provided vane grooves, a plurality of pump chambers partitioned by adjacent vanes around the rotor, and a pump chamber for performing a compression stroke, corresponding to the diametrical direction of the rotor. and a plurality of discharge ports provided facing each other. In the vane pump disclosed in Patent Literature 1, the rotor is formed with a recess that is recessed from the outer peripheral surface toward the center of rotation.

JP 2013-50067 A

In order to reduce the viscosity of the oil used as the working fluid of the vane pump, there is a tendency to increase the content of bubbles (air) in the oil. Inhaling oil with a high bubble content may result in, for example, a decrease in suction/discharge efficiency, fluctuations in discharge pressure, and deterioration in noise. The volume of the pump chamber is reduced to reduce the absolute amount of oil sucked into the pump chamber, in order to prevent a decrease in suction and discharge efficiency due to an increase in the air bubble content in the oil. can be considered. For this reason, it is conceivable to form the outer peripheral surface of the rotor in an arcuate shape around the rotation center of the rotor. However, simply changing the outer peripheral surface of the rotor into an arcuate shape around the center of rotation of the rotor in order to reduce the volume of the pump chamber may reduce the suction efficiency and the performance of the pump. .
SUMMARY OF THE INVENTION An object of the present invention is to provide a vane pump device capable of suppressing deterioration in pump performance while reducing the amount of sucked air bubbles contained in working fluid.

The present invention, which has been completed for this purpose, receives a rotational force from a rotating shaft and 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 a 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 disposed so as to surround the rotor, and the cam ring. A second recess is formed so as to cover the opening of the cam ring and is recessed toward the center of rotation from the curved surface of the rotor. A vane pump device comprising: a side member;

ADVANTAGE OF THE INVENTION According to this invention, the vane pump apparatus which can suppress the fall of a pump performance can be provided, reducing the amount to suck|inhale the bubble contained in a working fluid.

It is the perspective view which looked at some components of the vane pump from the cover side. It is the perspective view which looked at some components of the vane pump from the case side. FIG. 4 is a cross-sectional view showing a first oil flow path of the vane pump; FIG. 4 is a cross-sectional view showing a second oil flow path of the vane pump; It is the figure which looked at the rotor, the vane, and the cam ring in one direction of the rotating shaft direction, and the figure which looked at it in the other direction. FIG. 5 is a diagram showing the distance from the rotation center for each rotation angle on the cam ring inner peripheral surface of the cam ring. It is the figure which looked at the inner plate in the one direction of the rotating shaft direction, and the other direction. It is the figure which looked at the outer plate in the other direction of a rotating shaft direction, and one direction. It is the figure which looked at the case in one direction of the rotating shaft direction. It is the figure which looked at the cam ring and the inner plate in one direction. 11 is a cross-sectional view of the XI-XI section of FIG. 10; FIG. 1 is a perspective view of a rotor, a plurality of vanes, a cam ring and an outer plate; FIG. It is a figure which shows the schematic structure of the suction|inhalation inner side part of the vane pump which concerns on 2nd Embodiment. FIG. 11 is a diagram showing a schematic configuration of an inner suction portion of a vane pump according to a third embodiment; It is a figure which shows the schematic structure of the suction|inhalation inner side part of the vane pump which concerns on 4th Embodiment. It is the figure which looked at the one direction of the rotating shaft direction, and the other direction of the inner plate which concerns on 5th Embodiment. It is the figure which looked at the other direction of the rotating shaft direction, and the one direction of the outer plate which concerns on 5th Embodiment. 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 recessed part of a rotor. It is a figure which shows the modification of the curved-surface part of a rotor.

BEST MODE FOR CARRYING OUT THE INVENTION 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 components of a vane pump device 1 (hereinafter referred to as "vane pump 1") according to the embodiment, viewed from the cover 120 side.
FIG. 2 is a perspective view of some of the components of the vane pump 1 as seen from the case 110 side.
FIG. 3 is a cross-sectional view showing the flow path of the first oil of the vane pump 1. As shown in FIG. FIG. 3 is also a cross-sectional view taken along line III--III in FIG.
FIG. 4 is a cross-sectional view showing the flow path of the second oil of the vane pump 1. As shown in FIG. FIG. 4 is also a cross-sectional view taken along line IV-IV in FIG.
The vane pump 1 is a pump driven by, for example, power from a vehicle engine to supply oil, which is an example of a working fluid, to devices such as a hydraulic continuously variable transmission and a hydraulic power steering.

Also, the vane pump 1 discharges the oil sucked from one suction port 116 from two different discharge ports, a first discharge port 117 and a second discharge port 118 . 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, the vane pump 1 raises the pressure of the oil sucked from the suction port 116 and sucked into the pump chamber from the first suction port 2 (see FIG. 3) in the pump chamber to the first discharge port 4 (See FIG. 3) and ejected to the outside from the first ejection port 117 . In addition, the vane pump 1 raises 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) in the pump chamber to reach the second discharge port 5 (see FIG. 4). ) and ejected from the second outlet 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 the pump chamber.

The vane pump 1 includes a rotary shaft 10 that rotates by receiving a driving force from a vehicle engine or motor, a rotor 20 that rotates together with the rotary shaft 10, and a plurality of vanes 30 incorporated in grooves formed in the rotor 20. , and a cam ring 40 that surrounds the rotor 20 and vanes 30 .
In addition, the vane pump 1 includes an inner plate 50 as an example of a one-side member arranged closer to one end of the rotating shaft 10 than the cam ring 40, and an inner plate 50 arranged closer to the other end of the rotating shaft 10 than the cam ring 40. and an outer plate 60 as an example of the other side member.
The vane pump 1 also includes a housing 100 that accommodates the rotor 20 , the plurality of vanes 30 , the cam ring 40 , the inner plate 50 and the outer plate 60 . The housing 100 has a bottomed cylindrical case 110 and a cover 120 that covers the opening of the case 110 .

<Configuration 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 . 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 rotating shaft 10 rotates by receiving power from a drive source arranged outside the vane pump 1 , such as a vehicle engine, and rotates the rotor 20 via the spline 11 .
In the vane pump 1 according to the first embodiment, the rotary shaft 10 (rotor 20) is configured to rotate clockwise in FIG.

<Configuration of Rotor 20>
FIG. 5 is a view of the rotor 20, the vanes 30, and the cam ring 40 viewed from one direction and the other direction of the rotation axis direction.
The rotor 20 is a generally cylindrical member. 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 arc-shaped curved surface portion 22 around the rotation center C of the rotating shaft 10 on the outer peripheral portion. In addition, in the outer peripheral portion of the rotor 20, a plurality of vane grooves 23 (in the present embodiment, radially) that are recessed from the outer peripheral surface of the rotor 20 in the direction of the rotation center C and accommodate the vanes 30 are formed at equal intervals (radially) in the circumferential direction. 10) are formed. A rotor recess 24 , which is an example of a first recess recessed from the curved surface portion 22 toward the rotation center C side, is formed in the outer peripheral portion of the rotor 20 .

The curved surface portion 22 is formed between two adjacent vane grooves 23 .
The vane grooves 23 are grooves that open to the outer peripheral surface of the rotor 20 and both end surfaces of the rotating shaft 10 in the rotating shaft direction. As shown in FIG. 5, the vane groove 23 has a rectangular shape whose longitudinal direction is the radial direction of rotation when viewed in the direction of the rotation axis. It is circular with a diameter greater than its length. That is, the vane groove 23 has a rectangular parallelepiped groove 231 formed in a rectangular parallelepiped shape on the outer peripheral side, and a cylindrical groove 232 as an example of a center side space formed in a cylindrical 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 concave portion 24 is formed in the circumferential central portion of the curved surface portion 22 . The rotor recessed portion 24 has a chamfered shape that gradually faces toward the center of rotation C as it goes from the central portion side to the end portion in the direction of the rotation axis.

<Configuration of Vane 30>
The vanes 30 are rectangular parallelepiped members, and are incorporated in the vane grooves 23 of the rotor 20 one by one. The vane 30 has a length in the radial direction of rotation smaller than the length in the radial direction of rotation of the vane groove 23 and a width smaller than the width of the vane groove 23 . The vanes 30 are held in the vane grooves 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 substantially cylindrical shape, and includes a cam ring outer peripheral surface 41, a cam ring inner peripheral surface 42, an inner end surface 43 that is an end surface on the side of the inner plate 50 in the direction of the rotation axis, and an outer plate in the direction of the rotation axis. and an outer end face 44 that is the end face on the 60 side.
The cam ring outer peripheral surface 41 has a substantially circular shape in which the distance from the rotation center C is substantially equal over the entire circumference (except for a part) as shown in FIG. 5 when viewed in the rotation axis direction.

FIG. 6 is a diagram showing 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 cam ring inner peripheral surface 42 of the cam ring 40 is, as shown in FIG. 6, the distance L (in other words, the 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. 23) has two protrusions. That is, the distance L from the center of rotation C gradually increases from about 20 degrees to about 90 degrees in the counterclockwise direction when the positive vertical axis in the view in one direction shown in FIG. As the angle increases, the angle gradually decreases from about 160 degrees to form the first convex portion 42a. It is set to form a convex portion 42b. In cam ring 40 according to the present embodiment, the two protrusions have the same size.

As shown in FIG. 5, the cam ring 40 is formed with inner recesses 430 that are recessed from the inner end face 43 and outer recesses 440 that are recessed from the outer end face 44 .
As shown in FIG. 5 , the inner recess 430 forms a first suction recess 431 forming the first suction port 2 , a second suction recess 432 forming 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 rotation axis direction, the first suction recess 431 and the second suction recess 432 are formed so as to be symmetrical about the rotation center C, and the first discharge recess 433 and the second discharge recess 433 are formed to be symmetrical about the center of rotation C. The concave portion 434 is formed so as to be symmetrical with respect to the rotation center C. As shown in FIG. The first suction recess 431 and the second suction recess 432 are recessed over the entire inner end surface 43 in the rotation radial direction, 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 cam ring inner peripheral surface 42 to the cam ring outer peripheral surface 41 in the rotational radial direction, and are recessed in the circumferential direction by a predetermined range. It is recessed from the inner end surface 43 by an angle.

The outer recess 440 includes a first suction recess 441 forming the first suction port 2 and a second suction recess 442 forming the second suction port 3, as shown in FIG. , a first discharge recess 443 forming the first discharge port 4 and a second discharge recess 444 forming the second discharge port 5 . When viewed in the rotation axis direction, the first suction recess 441 and the second suction recess 442 are formed to be point-symmetrical with respect to the rotation center C, and the first discharge recess 443 and the second discharge recess 443 are formed to be symmetrical about the center of rotation C. The concave portion 444 is formed so as to be symmetrical with respect to the rotation center C. As shown in FIG. The first suction recess 441 and the second suction recess 442 are recessed over the entire outer end surface 44 in the rotation radial direction, and are recessed from the outer end surface 44 by a predetermined angle in the circumferential direction. The first ejection recess 443 and the second ejection recess 444 are recessed from the outer end surface 44 by a predetermined range from the cam ring inner peripheral surface 42 to the cam ring outer peripheral surface 41 in the rotational radial direction, and are recessed in the circumferential direction by a predetermined range. It is recessed from the outer end face 44 by an angle.

Further, when viewed in the rotation axis direction, 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. It is The second suction recess 432 and the second suction recess 442 are provided from about 20 degrees to about 90 degrees counterclockwise when the positive vertical axis in the view in one direction shown in FIG. 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. It is The second ejection recess 434 and the second ejection recess 444 are provided from about 130 degrees to about 175 degrees counterclockwise when the positive vertical axis in the one-way view shown in FIG. 5 is 0 degrees. The first ejection recess 433 and the first ejection recess 443 are provided from about 310 degrees to about 355 degrees.
The cam ring 40 is formed with two first discharge through-holes 45 that penetrate in the rotation axis direction so as to communicate between the first discharge recesses 433 and 443 . The cam ring 40 is formed with two second discharge through-holes 46 that penetrate in the rotation axis direction so as to communicate the second discharge recesses 434 and 444 .

In addition, the cam ring 40 has an inner end face 43 between the first suction recess 431 and the second discharge recess 434 and an outer end face 44 between the first suction recess 441 and the second discharge recess 444. is formed with a first through hole 47 that penetrates in the rotation axis direction. In addition, the cam ring 40 has an inner end face 43 between the second suction recess 432 and the first discharge recess 433 and an outer end face 44 between the second suction recess 442 and the first discharge recess 443. A second through-hole 48 is formed through in the direction of the rotating shaft.

<Configuration of Inner Plate 50>
7A and 7B are views of the inner plate 50 viewed from one direction and the other direction of the rotation axis direction.
The inner plate 50 is generally a disc-shaped member with a through hole formed in the center. It has a cam ring side end face 53 and an inner non-cam ring side end face 54 which is an end face 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. They are almost the same.
The inner inner peripheral surface 52 has a circular shape as shown in FIG. 5) is approximately the same as the distance to the bottom of the groove.

The inner plate 50 has an inner cam ring side recess 530 formed of a plurality of recesses recessed from the inner cam ring side end face 53 and an inner non-cam ring side recess 540 formed of a plurality of recesses recessed from the inner non-cam ring side end face 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 constitute the first suction port 2 and at a position facing the second suction recess 432 of the cam ring 40 . and a second suction recess 532 forming the second suction port 3 . The first suction recess 531 and the second suction recess 532 are formed so as to be symmetrical with respect to the center of rotation C. As shown in FIG.
The first suction recess 531 has a first suction inner portion 538 that constitutes a portion on the rotation center C side of the first suction port 2 . The second suction recess 532 has a second suction inner portion 539 that constitutes a portion on the rotation center C side of the second suction port 3 . The first inner suction portion 538 and the second inner suction 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 .
In addition, the inner cam ring side recess 530 is located at a position corresponding to the second intake recess 532 to the second discharge recess 533 in the circumferential direction, and faces the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the rotational radial direction. It has an inner second recess 534 at a position where
In addition, the inner cam ring side recess 530 is located at a position corresponding to the first discharge recess 433 in the circumferential direction and facing the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the radial direction of rotation. It has a recess 535 .
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 recessed portion 540 includes an outer peripheral groove 541 formed on the outer peripheral portion and into which the outer peripheral O-ring 57 (see FIG. 3) is fitted, and an inner peripheral O-ring 58 (see FIG. 3) formed on the inner peripheral portion. 3) has an inner peripheral groove 542, which is a groove into which the inner peripheral side groove 542 is fitted. The outer O-ring 57 and the inner O-ring 58 seal the gap between the inner plate 50 and the case 110 .

In the inner plate 50 , a first discharge through-hole 55 is formed at a position facing the first discharge concave portion 443 of the cam ring 40 . The opening of the cam ring 40 side of the first discharge through-hole 55 and the opening of the second discharge concave portion 533 are formed so as to be symmetrical with respect to the rotation center C. As shown in FIG.
Further, the inner plate 50 has a rotary shaft direction at a position corresponding to the first suction recess 531 in the circumferential direction and at a position facing the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the radial direction of rotation. An inner first through hole 56 which is a hole penetrating through is formed.

<Configuration of Outer Plate 60>
8A and 8B are views of the outer plate 60 viewed from the other direction and one direction of the rotation axis direction.
The outer plate 60 is generally a plate-like member with a through hole formed in the center, and includes an outer outer peripheral surface 61, an outer inner peripheral surface 62, and an outer cam ring which is an end surface on the cam ring 40 side in the rotation axis direction. It has a side end face 63 and an outer non-cam ring side end face 64 which is the end face on the side opposite to the cam ring 40 side in the rotation axis direction.
As shown in FIG. 8, the outer peripheral surface 61 has a shape obtained by cutting out two portions from the circular shape of the base when viewed in the rotation axis direction. The distance from the circular rotation center C of the base is substantially the same as the distance from the rotation center C of the cam ring outer peripheral surface 41 of the cam ring 40 . The two cutouts are formed at positions facing the first suction recess 441 and forming the first suction port 2 , and the second suction recess 442 . and a second intake notch 612 forming the second intake port 3 . The outer peripheral surface 61 is formed to be point symmetrical with respect to the rotation center C, and the first suction cutout portion 611 and the second suction cutout portion 612 are point symmetrical with respect to the rotation center C. It is formed to be
The first suction cutout portion 611 has a first suction inner portion 613 that constitutes a portion on the rotation center C side of the first suction port 2 . The second suction cutout portion 612 has a second inner suction portion 614 forming a portion of the second suction port 3 on the rotation center C side. The first inner suction portion 613 and the second inner suction portion 614 will be described in detail later.
The outer inner peripheral surface 62 has a circular shape as shown in FIG. It is approximately the same as the distance to the bottom.

The outer plate 60 is formed with an outer cam ring side recessed portion 630 formed of a plurality of recessed portions recessed from the outer cam ring side end face 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 .
In addition, the outer cam ring side recess 630 is located at a position corresponding to the first suction notch 611 to the first discharge recess 631 in the circumferential direction, and the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the rotational radial direction. It has an outer first concave portion 632 at a position facing the .
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 facing the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the radial direction of rotation. It has an outer second recess 633 .
In addition, the outer cam ring side concave portion 630 is parallel to the direction of the rotating shaft, and has a V-shaped cross section taken along a plane perpendicular to the outer peripheral surface 61. The depth of the concave portion increases from upstream to downstream in the rotational direction. has a first V-groove 634 in which the The downstream end of the first V-groove 634 is connected to the upstream end of the first ejection recess 631 .
In addition, the outer cam ring side concave portion 630 is parallel to the direction of the rotating shaft, and has a V-shaped cross section taken along a plane perpendicular to the outer peripheral surface 61. The depth of the concave portion increases from upstream to downstream in the rotational direction. has a second V-groove 635 with a larger . The downstream end of the second V-groove 635 is connected to the upstream end of the second discharge through-hole 65 .

In the outer plate 60 , a second discharge through-hole 65 is formed at a position facing the second discharge concave portion 444 of the cam ring 40 . The opening of the second discharge through-hole 65 on the side of the cam ring 40 and the opening of the first discharge concave portion 631 are formed so as to be symmetrical with respect to the rotation center C. As shown in FIG.
Further, the outer plate 60 is provided with a rotating shaft at a position corresponding to the second intake notch 612 in the circumferential direction and at a position facing the cylindrical groove 232 of the vane groove 23 of the rotor 20 in the radial direction of rotation. An outer second through hole 66 is formed as a hole penetrating in the axial direction.
In the outer plate 60 , a first through hole 67 , which is a hole penetrating in the rotation axis direction, is formed at a position facing the first through hole 47 of the cam ring 40 at a position facing the second through hole 48 of the cam ring 40 . A second through-hole 68 is formed through in the direction of the rotation axis.

<Configuration of housing 100>
Housing 100 accommodates rotor 20 , vanes 30 , cam ring 40 , inner plate 50 and outer plate 60 . Further, the housing 100 accommodates one end of the rotating shaft 10 inside and protrudes the other end.
Case 110 and cover 120 are fastened with bolts.

(Configuration of Case 110)
FIG. 9 is a diagram of the case 110 viewed in one direction of the rotating shaft direction.
The case 110 is a cylindrical member with a bottom, and has a case-side bearing 111 that rotatably supports one end of the rotary shaft 10 at the center of the bottom.
The case 110 also 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 farther from the rotation center C (outer diameter side). have.

The inner diameter fitting portion 113 is provided on the outer diameter side of the case side bearing 111 as shown in FIG. and an inner diameter side suppressing portion 113b that suppresses movement of the inner plate 50 to the bottom side. The inner diameter side cover portion 113a has a circular shape whose distance from the rotation center C is smaller than the distance from the rotation center C of the inner inner peripheral surface 52 when viewed in the rotation axis direction. The radially inner suppressing portion 113b is a doughnut-shaped surface perpendicular to the direction of the rotation axis. The distance from the center of rotation C on the circle is smaller than the distance from the center of rotation C on the inner peripheral surface 52 .

As shown in FIG. 3, the outer diameter side fitting portion 114 includes an outer diameter side cover portion 114a that covers a part of the inner outer peripheral surface 51 of the inner plate 50, and an outer diameter side cover portion 114a that prevents the inner plate 50 from moving to the bottom side. and an outer diameter side suppressing portion 114b for suppressing. The outer diameter side cover portion 114a has a circular shape whose distance from the rotation center C is greater than the distance from the rotation center C of the inner outer peripheral surface 51 when viewed in the rotation axis direction. The outer diameter side suppressing portion 114b is a doughnut-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 cover portion 114a, The distance from the center of rotation C in the inner circle is smaller than the distance from the center of rotation C in the inner peripheral surface 51 .

In the inner plate 50, the inner peripheral O-ring 58 fitted in the inner peripheral groove 542 of the inner plate 50 abuts against the inner diameter suppressing portion 113b, and the outer peripheral O-ring 57 fitted in the outer peripheral groove 541 suppresses the outer peripheral side. It is inserted into the bottom side until it abuts against the portion 114b. The inner O-ring 58 contacts the inner groove 542 of the inner plate 50 , the inner cover portion 113 a and the inner suppressing portion 113 b of the case 110 , and the outer O-ring 57 contacts the outer circumference of the inner plate 50 . The case 110 and the inner plate 50 are sealed by coming into contact with the side groove 541 , the outer diameter side covering portion 114 a and the outer diameter side suppressing portion 114 b of the case 110 . As a result, a space S1 on the opening side of the inner plate fitting portion 112 in the case 110 and a space S2 on the bottom side of the inner plate fitting portion 112 are separated. A space S1 closer to the opening than the inner plate fitting portion 112 forms an intake passage R1 through which oil sucked from the first intake port 2 and the second intake port 3 flows. A space S2 on the bottom side of the inner plate fitting portion 112 constitutes a first discharge passage R2 through which the oil discharged from the first discharge port 4 flows.

Further, in the case 110, apart from the housing space for housing the rotor 20, the vanes 30, the cam ring 40, the inner plate 50 and the outer plate 60, there is provided a rotating shaft direction from the opening side outside the housing space in the rotation radial direction. A case outer concave portion 115 is formed which is concave inward. The case outer concave portion 115 faces a later-described cover outer concave portion 123 formed in the cover 120 and constitutes a case second discharge flow path R3 through which the oil discharged from the second discharge port 5 flows.

In addition, as shown in FIG. 1, the case 110 is formed with an intake 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 includes a cylindrical hole formed in the side wall of the case 110 and having a column direction perpendicular to the rotation axis direction. The intake port 116 constitutes an intake flow path R1 through which oil sucked from the first intake port 2 and the second intake port 3 flows.

In addition, 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 includes a cylindrical hole formed in the side wall of the case 110 and having a column direction perpendicular to the rotation axis 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.

In addition, as shown in FIG. 1, the case 110 is formed with a second outlet 118 that communicates between the case outer concave portion 115 and the outside of the case 110 . The second discharge port 118 is a cylindrical hole formed in the side wall of the case outer concave portion 115 in the case 110 and includes a hole whose column direction is perpendicular to the rotation axis 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.

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

Further, the cover 120 includes 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, the cover second discharge recess 122 and the cover outer recess 123 . and a cover recess connecting portion 124 connecting the two in the other direction of the rotation axis direction than the end face on the case 110 side. The cover outer recess 123 is formed so as to open at a position that does not face the accommodation space formed in the case 110 , and faces the case outer recess 115 . The cover second discharge recess 122, the cover recess connecting part 124, and the cover outer recess 123 constitute 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 through the cover recess connecting portion 124 and into the outer second through hole 66 through the cover second discharge recess 122. .

In addition, the cover 120 includes a portion of the outer plate 60 facing the first intake cutout portion 611 and the second intake 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 face on the case 110 side is formed in a portion facing the space outside the cam ring outer peripheral surface 41 of the cam ring 40 in the rotation radial direction.
The cover suction recess 125 constitutes a suction flow path R1 through which oil that is 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 concave portion 127 and a second cover concave portion 127 which are concave from the end surface of the case 110 side in the rotation axis direction at positions facing the first through hole 67 and the second through hole 68 of the outer plate 60 , respectively. A recess 128 is formed.

<Action of vane pump 1>
The vane pump 1 according to the present embodiment has 10 vanes 30, and the 10 vanes 30 contact the cam ring inner peripheral surface 42 of the cam ring 40, so that the two adjacent vanes 30 and these adjacent vanes 30 The outer peripheral surface of the rotor 20 between the two vanes 30, the cam ring inner peripheral surface 42 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, when the rotating shaft 10 rotates once and the rotor 20 rotates once, the pump chamber rotates around the rotating shaft 10 once. During 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 and discharged from the second discharge port 5 .

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

The first inner suction portion 538 and the second inner suction portion 539 of the inner plate 50 and the first inner suction portion 613 and the second inner suction portion 614 of the outer plate 60 have substantially the same shape. They may be collectively referred to as the "inner suction portion 710". Further, in the following description, when there is no need 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 "suction port". Sometimes.

The suction inner portion 710 includes a suction inner body portion 711 that conforms to the shape of the curved surface portion 22 of the rotor 20, and a suction inner recess portion 712 as an example of a second recess recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. have. In addition, the inner suction portion 710 has an inner suction intermediate portion 713 that is a portion between the inner suction main body portion 711 and the inner suction concave portion 712 .
The intake inner 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 to connect to the upstream end (upstream end) of the suction port. Here, in terms of the first intake port 2, the rotation angle at the upstream end (upstream end) of the intake port is the first intake recess 431 formed in the cam ring 40 constituting the first intake port 2 and 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 becomes 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 to connect to the upstream end of the first suction recess 531 formed in the inner plate 50 .
The portion of the suction inner recess 712 that is most recessed toward the center of rotation C is the same distance as the distance from the center of rotation C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

The intake 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 at each rotation angle at the suction inner intermediate portion 713 is shorter than the distance L from the rotation center C at each rotation angle on the cam ring inner peripheral surface 42 of the cam ring 40 by a predetermined distance.
The suction inner recess 712 and the upstream end of the suction port are connected by a curved surface with a predetermined radius, and the suction inner main body portion 711 and the suction inner intermediate portion 713 are connected by a curved surface with a predetermined radius. In addition, 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.

Advantages of the vane pump 1 according to the present embodiment will be described below in comparison with a comparative configuration.
As a vane pump according to a comparative configuration, a configuration in which a recessed portion is formed from the curved surface portion 22 toward the rotation center C over the entirety of the vane pump 1 according to the present embodiment is considered.
In the vane pump 1 according to the present embodiment, the curved surface portion 22 formed between two adjacent vane grooves 23 has an arc shape centered on the rotation center C. The volume of the pump chamber is small. Compared to the vane pump 1 according to the present embodiment, the vane pump according to the comparative configuration has a larger volume of the pump chamber due to the concave portion recessed toward the rotation center C side from the curved surface portion 22 over the entire rotation axis direction.

Therefore, the amount of oil sucked into the pump chamber of 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 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 lot of air bubbles are sucked into the pump chamber, a sound is generated when the air bubbles are crushed in the subsequent stroke. Also, when the air bubbles sucked into the pump chamber split or when the split air bubbles collide with the inner peripheral surface of the cam ring 40 or the like, a sound is generated. In addition, the amount of oil other than air bubbles that can be sucked into the pump chamber is reduced by the amount of air bubbles 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 compared to the vane pump according to the comparative configuration. 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 end portions of the rotor 20 in the rotation axis direction. By forming the rotor recess 24, 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 compared to the configuration in which the rotor concave portion 24 is not formed, so the suction efficiency can be improved. As a result, an excessive decrease in the amount of oil that can be sucked into the pump chamber due to the arc-shaped curved surface portion 22 around the center of rotation C of the outer peripheral portion of the rotor 20 can be suppressed. can be done.

Further, the rotor recess 24 formed in the rotor 20 is a portion facing the first suction recess 431 and the first suction recess 441 of the cam ring 40, which constitute the suction port. 441 are formed at the ends in the rotation axis direction. Therefore, compared to the case where the rotor recessed portion 24 is formed in the central portion of the rotation shaft direction, which is not opposed to the first suction recessed portion 431 and the first suction recessed portion 441 of the cam ring 40, suction into the pump chamber is performed. more oil.
Further, the size of the rotor recess 24 in the direction of the rotation axis is smaller than the size of the first suction recess 431 and the first suction recess 441 of the cam ring 40 in the direction of the rotation axis. As a result, while reducing the absolute amount of air sucked into the pump chamber, the suction efficiency is lowered due to the fact that the shape of the outer peripheral portion of the rotor 20 is the arc-shaped curved surface portion 22 centered on the rotation center C. You can prevent overdoing it.

Further, in the vane pump 1 according to the present embodiment, the rotor concave portion 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 in the circumferential direction. is not formed. Therefore, the area of the portion of the rotor 20 that supports the vanes 30 is larger than in the configuration in which the rotor recesses 24 are also formed around the vane grooves 23 . As a result, even if the vanes 30 are pushed by the high-pressure oil that has flowed into the cylindrical grooves 232 of the vane grooves 23, the vanes 30 are supported over a wide range by the rotor 20, thereby suppressing the collapse of the vanes 30. be able to.

In addition, in the vane pump 1 according to the present embodiment, the inner suction portion 710 of the suction port (the first inner suction portion 538 and the second inner suction portion 539 of the inner plate 50, the first inner suction portion 613 of the outer plate 60 and the second inner suction portion 539 of the inner plate 50) The second inner suction portion 614) is formed with an inner suction recess 712 that is recessed toward the center of rotation C with respect to the curved surface portion 22 of the rotor 20 . Due to this shape, for example, 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 compared to a configuration in which the suction inner recessed portion 712 is not formed, the opening area of the suction port is reduced. 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 recessed portion 712 is not formed.

Further, in the vane pump 1 according to the present embodiment, the suction inner concave portion 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 of the pump chamber begins to increase at the beginning of the suction stroke. As a result, according to the vane pump 1 of the present embodiment, it is possible to increase the amount of oil to be sucked, so that the suction efficiency can be improved.
At the downstream end of the intake port where the vanes 30 protrude from the vane grooves 23 formed in the rotor 20, the distance from the rotation center C is the same as the distance to the curved surface portion 22 of the rotor 20. Since the main body portion 711 supports the end portion of the vane 30, the vane 30 can be prevented from falling.

<Second embodiment>
FIG. 13 is a diagram showing a schematic configuration of the suction inner portion 720 of the vane pump 702 according to the second embodiment.
A 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, in contrast to the vane pump 1 according to the first embodiment. Points are different. Differences from the vane pump 1 according to the first embodiment will be described below. Components having the same shape and function in the vane pump 702 according to the second embodiment and the vane pump 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The inner suction portion 720 has an inner suction body portion 721 that conforms to the shape of the curved surface portion 22 of the rotor 20 and an inner suction concave portion 722 that is recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20 . In addition, the inner suction portion 720 has an inner suction intermediate portion 723 that is a portion between the inner suction main body portion 721 and the inner suction concave portion 722 .
The suction inner recess 722 is formed to connect to the downstream end (downstream end) of the suction port. Here, in terms of the first intake port 2, the rotation angle at the downstream end (downstream end) of the intake port is the first intake recess 431 formed in the cam ring 40 constituting the first intake port 2 and Since the rotation angles of the downstream ends of the first suction recess 441, the first suction recess 531 formed in the inner plate 50, and the first suction notch 611 formed in the outer plate 60 are all the same, these It becomes 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 to connect to the downstream end of the first suction recess 531 formed in the inner plate 50 .
The portion of the suction inner recess 722 that is most recessed toward the center of rotation C is the same distance as the distance from the center of rotation 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 to connect the suction inner concave portion 722 and a central portion 724 between the upstream end and the downstream end of the suction inner portion 720 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 with a predetermined radius, and the suction inner main body portion 721 and the suction inner intermediate portion 723 are connected by a curved surface with a predetermined radius. In addition, 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 intake inner part 720 of the intake port (the first inner intake part 538 and the second inner intake part 539 of the inner plate 50, the first inner intake part 613 and the second inner intake part 613 of the outer plate 60). 2 Inner suction portion 614) is formed with an inner suction recess 722 that is recessed toward the center of rotation C with respect to the curved surface portion 22 of the rotor 20 . Due to this shape, for example, 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 port opening area is reduced compared to a configuration in which the suction inner recessed portion 722 is not formed. becomes larger. As a result, according to the vane pump 702 according to the second embodiment, suction efficiency can be improved compared to a vane pump in which the suction inner concave portion 722 is not formed.

Further, in the vane pump 702 according to the second embodiment, the suction inner recessed portion 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, it is possible to increase the amount of oil to be sucked, so that the suction efficiency can be improved.

<Third Embodiment>
FIG. 14 is a diagram showing a schematic configuration of the suction inner portion 730 of the vane pump 703 according to the third embodiment.
A vane pump 703 according to the third embodiment has an inner suction portion 730 corresponding to the inner suction portion 710 of the vane pump 1 according to the first embodiment, in contrast to the vane pump 1 according to the first embodiment. Points are different. Differences from the vane pump 1 according to the first embodiment will be described below. Components having the same shape and function in the vane pump 703 according to the third embodiment and the vane pump 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The inner suction portion 730 according to the third embodiment is formed with an inner suction recess 732 that is recessed closest to the center of rotation C in the central portion between the upstream end and the downstream end of the inner suction portion 730. It differs from the suction inner portion 710 according to the first embodiment and the suction inner portion 720 according to the second embodiment. The portion of the suction inner recess 732 that is most recessed toward the center of rotation C is the same distance as the distance from the center of rotation C to the end of the rotor recess 24 of the rotor 20 in the rotation axis direction.

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

In the vane pump 703 according to the third embodiment, the intake inner part 730 of the intake port (the first inner intake part 538 and the second inner intake part 539 of the inner plate 50, the first inner intake part 613 and the second inner intake part 613 of the outer plate 60). 2 Inner suction portion 614) is formed with an inner suction recess 732 that is recessed toward the center of rotation C with respect to the curved surface portion 22 of the rotor 20 . This shape increases the opening area of the suction port compared to a configuration in which the entire circumferential direction of the suction inner portion 730 is formed at the same distance as the distance from the rotation center C to the curved surface portion 22 of the rotor 20, for example. . As a result, according to the vane pump 703 according to the third embodiment, it is possible to improve the suction efficiency compared to a vane pump in which the suction inner concave portion 732 is not formed.

In addition, in the vane pump 703 according to the third embodiment, the suction inner concave portion 732 is formed in the circumferential central portion 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 rotates approximately 7 degrees to approximately 45 degrees after the volume of the pump chamber begins to increase. As a result, in a region where the rotation speed of the rotor 20 is high, oil does not begin to be sucked until after the volume of the pump chamber begins to increase, for example, after the rotor 20 has rotated approximately 5 degrees. Since the opening area of can be increased, the suction efficiency can be enhanced.
At the downstream end of the intake port where the vane 30 protrudes from the vane groove 23 formed in the rotor 20, the distance from the center of rotation C gradually increases from the upstream end to the downstream end. The ends of the vanes 30 can be easily supported, and the vanes 30 can be prevented from falling down.

<Fourth Embodiment>
FIG. 15 is a diagram showing a schematic configuration of the suction inner portion 740 of the vane pump 704 according to the fourth embodiment.
A 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, in contrast to the vane pump 1 according to the first embodiment. Points are different. Differences from the vane pump 1 according to the first embodiment will be described below. Components having the same shape and function in the vane pump 704 according to the fourth embodiment and the vane pump 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the inner suction portion 740 according to the fourth embodiment, the portion corresponding to the inner suction concave portion 712 of the inner suction portion 710 according to the first embodiment constitutes 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 entire length. In other words, in the suction inner portion 740 according to the fourth embodiment, 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 the distance from the rotation center C to the minimum diameter of the rotor recess 24 of the rotor 20. It has an intake inner recess 742 that is the same as the distance. The suction inner concave portion 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 with a predetermined radius, and the suction inner recess 742 and the downstream end of the suction port are connected by a curved surface with a predetermined radius.

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

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

In the above-described first to fourth embodiments, the portion of the suction inner recess (eg, suction inner recess 722) of the suction inner portion (eg, suction inner portion 710) that is most recessed toward the rotation center C side. is the same distance as the distance from the center of rotation C to the end of the rotor recessed portion 24 of the rotor 20 in the direction of the rotation axis, but it is not particularly limited to this aspect. The portion of the suction inner recess that is most recessed toward the center of rotation C may be recessed further toward the center of rotation C than the rotor recess 24 of the rotor 20 from the center of rotation C. As a result, the opening area of the suction port is increased, thereby improving the suction efficiency.

<Fifth Embodiment>
The vane pump 705 according to the fifth embodiment has the first discharge port 4 or the second discharge port in the inner plate 50 and the outer plate 60 in contrast to the vane pumps according to the first to fourth embodiments described above. 5 is recessed from the curved surface portion 22 of the rotor 20 toward the rotation center C side. Differences from the vane pumps according to the first to fourth embodiments will be described below. Components having the same shape and function in the vane pump 705 according to the fifth embodiment and the vane pumps according to the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

16A and 16B are diagrams of the inner plate 850 according to the fifth embodiment viewed from one direction and the other direction of the rotation axis direction.
The first discharge through-hole 855 of the inner plate 850 according to the fifth embodiment has a first inner discharge part 858 that constitutes a portion on the rotation center C side of the first discharge port 4 . In addition, the second discharge recessed portion 853 of the inner plate 850 has a second discharge inner portion 859 that constitutes a portion on the rotation center C side of the second discharge port 5 .

17A and 17B are views of the outer plate 860 according to the fifth embodiment viewed in the other direction and the one direction of the rotation axis direction.
The first discharge recessed portion 863 of the outer plate 860 according to the fifth embodiment has a first discharge inner portion 868 that constitutes a portion on the rotation center C side of the first discharge port 4 . In addition, the second discharge through-hole 865 of the outer plate 860 has a second inner discharge part 869 that constitutes a part on the rotation center C side of the second discharge port 5 .

The first inner discharge portion 858 and the second inner discharge portion 859 of the inner plate 850 and the first inner discharge portion 868 and the second inner discharge portion 869 of the outer plate 860 have substantially the same shape. They may be collectively referred to as the “discharge inner portion 800”. Further, in the following description, when there is no need 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 "discharge port". Sometimes.

FIG. 18 is a view of the cam ring 40 and the inner plate 850 viewed in the other direction.
The inner discharge portion 800 includes a discharge inner main body portion 801 that conforms to the shape of the curved surface portion 22 of the rotor 20, and a discharge inner recess portion 802 as an example of a second recess recessed toward the rotation center C side of the curved surface portion 22 of the rotor 20. have. The inner discharge portion 800 also has an inner discharge intermediate portion 803 that is a portion between the inner discharge body portion 801 and the inner discharge concave portion 802 .
The discharge inner 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 to connect 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 the first discharge concave portion 433 formed in the cam ring 40 constituting the first discharge port 4 and the rotation angle of the first discharge port 4 . 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 is the rotation angle of the upstream end of That is, the inner discharge recess 802 in the first inner discharge part 858 is formed to connect to the upstream end of the first discharge through hole 855 formed in the inner plate 50 .
The portion of the discharge inner recessed portion 802 that is most recessed toward the rotation center C side is the same distance as the distance from the rotation center C to the end of the rotor recessed portion 24 of the rotor 20 in the rotation axis direction.

The discharge inner intermediate portion 803 is formed to connect the discharge inner concave portion 802 with a central portion 804 between the upstream end and the downstream end of the discharge inner portion 800 in the discharge inner body portion 801 .
The discharge inner concave portion 802 and the upstream end of the discharge port are connected by a curved surface with a predetermined radius, and the discharge inner main body portion 801 and the discharge inner intermediate portion 803 are connected by a curved surface with a predetermined radius. In addition, the discharge inner body portion 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 and second inner discharge portions 858 and 859 of the inner plate 850, the first and second inner discharge portions 868 and 868 of the outer plate 860). 2 discharge inner portion 869 ) is formed with a discharge inner concave portion 802 which is concave toward the rotation center C side from the curved surface portion 22 of the rotor 20 . Due to this shape, for example, the discharge inner 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 port opening area is reduced compared to a configuration in which the discharge inner concave portion 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 compared to the vane pump having the discharge inner portion 800 in which the discharge inner recessed portion 802 is not formed. That is, since the opening area of the discharge port becomes large at the beginning of the discharge stroke, the discharge pressure can be reduced from the beginning of the discharge stroke. Therefore, backflow of oil from the discharge port to the pump chamber can be suppressed, and more oil can be discharged from the beginning of the discharge stroke. Therefore, even if the oil in the pump chamber contains bubbles (air), it becomes easy to completely discharge the bubbles (air). As a result, more oil can be sucked in the suction stroke after the discharge stroke.

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

<Modified Example of Rotor Concave 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 first suction recess 431 and the first suction recess 441 of the cam ring 40 in the rotation axis direction. Although it is small, it is not particularly limited to such an aspect.

FIG. 19 is a diagram showing a modification of the rotor recess 24 of the rotor 20. As shown in FIG.
As shown in FIG. 19, the size of the rotor recess 24 in the direction of the rotation axis may be larger than the size of the first suction recess 431 and the first suction recess 441 of the cam ring 40 in the direction of the rotation axis. For example, with respect to the rotor recesses 24 according to the first to fifth embodiments, the size of the rotor recesses 24 at the ends of the rotor 20 in the rotation axis direction is the same in the direction of the rotation center C, and the rotor recesses 24 It is preferable to increase the size in the direction of the rotation axis. As a result, the volume recessed from the curved surface portion 22 toward the center of rotation C becomes larger than that of the rotor 20 according to the first to fifth embodiments. As a result, it is possible to increase the amount of oil sucked into the pump chamber. Therefore, it is possible to prevent the amount of oil that can be inhaled from decreasing too much.

It should be noted that the rotor recesses 24 formed at both ends of the rotor 20 in the rotation axis direction may be connected to each other. That is, the ends of both rotor recesses 24 on the side of the outer peripheral surface (curved surface portion 22) of the rotor 20 may be the same. In other words, the end portions of the rotor recesses 24 on the side of the outer peripheral surface of the rotor 20 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 center of rotation C becomes the largest.

<Modified example of curved surface portion 22>
FIG. 20 is a diagram showing a modification of the curved surface portion 22 of the rotor 20. As shown in FIG.
In the first to fifth embodiments described above, the curved surface portion 22 of the rotor 20 rotates from the curved surface portion 22 so that the two rotor concave portions 24 formed at both ends in the rotation axis direction communicate with each other. A communicating portion 222 recessed toward the center C may be formed. Communicating portion 222 is formed to extend in the rotation axis direction, and can be exemplified by being formed in the central portion of curved surface portion 22 in the circumferential direction.
By providing the communication portion 222 that communicates between the two rotor recesses 24, the air that collects on the side of the rotor 20 during rotation due to centrifugal force can be guided into the communication portion 222, and the air is discharged to the discharge port in the discharge section. It can improve performance. In addition, since the performance of discharging air from the pump chamber can be enhanced, fluctuations in pressure and noise can be suppressed.

Reference Signs List 1, 702, 703, 704, 705 Vane pump 2 First intake port 3 Second intake port 4 First discharge port 5 Second discharge port 10 Rotating shaft 20 Rotor 22 Curved surface portion 24 Rotor concave portion 30 Vane 40 Cam ring 50 Inner plate 60 Outer plate 100 Housing 110 Case 120 Cover 710, 720, 730, 740 Inner suction portion , 712, 722, 732, 742... Suction inner concave part 800... Discharge inner part 802... Discharge inner concave part

Claims (5)

A first recess that receives a rotational force from a rotating shaft and rotates while supporting a plurality of vanes, has an arc-shaped curved surface portion centered on the rotating shaft, and is recessed from the curved surface portion toward the center of rotation. a rotor on which is formed;
a cam ring having an inner peripheral surface facing the curved surface portion of the rotor and arranged to surround the rotor;
A second recess is formed at one end of the cam ring in the axial direction of the rotating shaft so as to cover the opening of the cam ring and is recessed closer to the center of rotation than the curved surface portion of the rotor. one side member;
with
The one-side member is an intake port for sucking working fluid into a pump chamber defined by the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes among the plurality of vanes. having an inner portion that constitutes a portion on the side of the rotation center;
the second recess is a part 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.
vane pump device. A first recess that receives a rotational force from a rotating shaft and rotates while supporting a plurality of vanes, has an arc-shaped curved surface portion centered on the rotating shaft, and is recessed from the curved surface portion toward the center of rotation. a rotor on which is formed;
a cam ring having an inner peripheral surface facing the curved surface portion of the rotor and arranged to surround the rotor;
A second recess is formed at one end of the cam ring in the axial direction of the rotating shaft so as to cover the opening of the cam ring and is recessed closer to the center of rotation than the curved surface portion of the rotor. one side member;
with
The one-side member is an intake port for sucking working fluid into a pump chamber defined by the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes among the plurality of vanes. having an inner portion that constitutes a portion on the side of the rotation center;
the second recess is a part of the inner portion recessed toward the center of rotation;
The vane pump device, wherein the second concave portion of the one-side member is formed at a downstream portion in the circumferential direction of the inner portion. A first recess that receives a rotational force from a rotating shaft and rotates while supporting a plurality of vanes, has an arc-shaped curved surface portion centered on the rotating shaft, and is recessed from the curved surface portion toward the center of rotation. a rotor on which is formed;
a cam ring having an inner peripheral surface facing the curved surface portion of the rotor and arranged to surround the rotor;
A second recess is formed at one end of the cam ring in the axial direction of the rotating shaft so as to cover the opening of the cam ring and is recessed closer to the center of rotation than the curved surface portion of the rotor. one side member;
with
The one-side member is an intake port for sucking working fluid into a pump chamber defined by the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes among the plurality of vanes. having an inner portion that constitutes a portion on the side of the rotation center;
the second recess is a part of the inner portion recessed toward the center of rotation;
The vane pump device, wherein the second concave portion of the one-side member is formed at a substantially central portion in a circumferential direction of the inner portion. An intake port that forms an intake path for sucking working fluid into a pump chamber defined by the outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes among the plurality of vanes. , the cam ring is formed with a third recess recessed in the axial direction of the rotating shaft from the mating surface with the one-side member,
4. The vane pump device according to any one of claims 1 to 3 , wherein said first recess of said rotor is formed in a portion facing said third recess of said cam ring. 5. The vane pump device according to claim 4 , 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.

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