WO2016017710A1

WO2016017710A1 - Variable vane pump

Info

Publication number: WO2016017710A1
Application number: PCT/JP2015/071533
Authority: WO
Inventors: 卓一羽廣
Original assignee: ダイキン工業株式会社
Priority date: 2014-07-31
Filing date: 2015-07-29
Publication date: 2016-02-04
Also published as: CN106574616A; JP2016033349A; CN106574616B; KR20170020934A; JP5983687B2; KR101739721B1

Abstract

Conventional variable vane pumps retain working fluid inside a compression chamber when a cam ring has moved to a pressing member side from an eccentric position at the reverse side of the rotor from the pressing member and exhibit the problem of high temperatures in the compression chamber. This variable vane pump has a communication part 31. When a cam ring 7 has moved to a pressing member 10 side from an eccentric position at the reverse side of a rotor 5 from the pressing member 10, i.e. when the variable vane pump has changed from a full flow state to a dead head state, the communication part 31 changes from a state in which a compression chamber 9 and an outer space 11 that is radially outward of the cam ring 7 are not in communication to a state in which the compression chamber 9 and the outer space 11 are in communication.

Description

Variable vane pump

The present invention relates to a variable vane pump.

As a conventional variable vane pump, an annular cam ring, a rotor arranged inside the cam ring, and a plurality of slits formed on the outer peripheral surface of the rotor are arranged so as to be able to advance and retreat, and contact the inner peripheral surface of the cam ring. It has a plurality of vanes forming a plurality of compression chambers, an end surface member disposed on the end surfaces of the cam ring and the rotor, and a pressing member that presses the cam ring. The end surface member is formed with a suction hole for supplying a working fluid (for example, oil) to the compression chamber and a discharge hole for discharging the working fluid in the compression chamber. In this variable vane pump, when the cam ring is pressed by the pressing member, the cam ring is eccentric to the rotor opposite to the pressing member. Then, when the operation is started and the rotor rotates, the vane arranged in the slit advances and retreats according to the position, the compression chamber expands on the suction side, the working fluid is supplied to the compression chamber, and the compression fluid is compressed on the discharge side. The chamber shrinks and the working fluid in the compression chamber is discharged.

JP 2007-315349 A

In the variable vane pump as described above, for example, during pressure holding, the pressure in the compression chamber may rise, the pressure in the compression chamber may exceed the pressing force of the pressing member, and the cam ring may move to the pressing member side. When the center position of the cam ring and the center position of the rotor coincide, the size of the compression chamber does not change even when the rotor rotates, so that the working fluid in the compression chamber is hardly discharged from the discharge hole, and the compression chamber There is a problem that the working fluid stays in the chamber and the compression chamber becomes high temperature.

Therefore, an object of the present invention is to provide a variable vane pump that can prevent the compression chamber from becoming hot when the cam ring moves from the position eccentric to the opposite side of the pressing member to the pressing member side. is there.

A variable vane pump according to a first aspect of the present invention is an annular cam ring, a rotor that is disposed inside the cam ring and has a plurality of slits that are spaced apart from each other in the circumferential direction, and can be advanced and retracted by the plurality of slits, respectively. A plurality of vanes that are in contact with an inner peripheral surface of the cam ring to form a plurality of compression chambers, a pressing member that is disposed radially outside the cam ring and presses the cam ring, and the cam ring is the rotor The compression chamber and the outer space from a state in which the compression chamber and the outer space on the radially outer side of the cam ring do not communicate with each other when moved from the position eccentric to the opposite side to the pressing member to the pressing member side. And a communication portion configured to change to a state in which the communication is established.

In this variable vane pump, when the cam ring moves from the position eccentric to the side opposite to the pressing member to the pressing member side and the working fluid in the compression chamber is hardly discharged from the discharge hole, the compression chamber And the outer space communicate with each other, the working fluid in the compression chamber is easily discharged to the outer space as compared with the case where the compression chamber and the outer space do not communicate with each other. Therefore, a large amount of working fluid having a low temperature is supplied from the suction hole to the compression chamber, and the temperature in the compression chamber decreases. Therefore, it is possible to prevent the compression chamber from becoming hot when the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member side.

The variable vane pump according to a second aspect of the present invention is the variable vane pump according to the first aspect of the present invention, further comprising an end surface member disposed on an end surface of the cam ring and the rotor, wherein the communication portion is the pressure of the end surface member. The cam ring is disposed on the member side, and the cam ring is closed from the state where the cam ring is blocked when the cam ring moves to the pressing member side from a position eccentric to the opposite side of the rotor with respect to the rotor. The compression chamber and the outer space are communicated with each other by changing to a state in which they cannot be separated.

In this variable vane pump, the compression chamber and the outer space communicate with each other by utilizing the fact that the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member side. It is possible to easily communicate with the space.

A variable vane pump according to a third aspect of the invention is the variable vane pump according to the second aspect of the invention, wherein the communicating part is a groove formed on an end face on the cam ring side of both end faces of the end face member. .

In this variable vane pump, since the communicating part is a groove formed on the end face on the cam ring side of both end faces of the end face member, it is easy to provide the communicating part.

A variable vane pump according to a fourth invention is the variable vane pump according to the second or third invention, wherein the end surface member has a suction hole for supplying a working fluid to the compression chamber, An opening that can communicate with the compression chamber is disposed away from the suction hole in the circumferential direction.

In this variable vane pump, since the opening of the communication part is arranged away from the suction hole in the circumferential direction, the working fluid supplied from the suction hole to the compression chamber is short-circuited and immediately discharged from the communication part. Can be prevented.

A variable vane pump according to a fifth invention is characterized in that, in the variable vane pump according to the fourth invention, the distance between the opening and the suction hole is longer than the circumferential length of all the compression chambers. To do.

In this variable vane pump, since the distance between the opening of the communicating portion and the suction hole is longer than the circumferential length of all the compression chambers, the opening and the suction hole do not open simultaneously into one compression chamber. . Therefore, it is possible to more reliably prevent the working fluid supplied from the suction hole to the compression chamber from being discharged from the communication portion immediately after a shortcut.

A variable vane pump according to a sixth invention is the variable vane pump according to the fifth invention, wherein the variable vane pump has a notch extending from the suction hole toward the opening, and the opening and the notch The distance between the two is longer than the circumferential length of all the compression chambers.

In this variable vane pump, since the distance between the opening of the communication portion and the notch is longer than the circumferential length of all the compression chambers, the working fluid supplied to the compression chamber from the notches is short-circuited immediately. It can prevent being discharged from the communication part.

A variable vane pump according to a seventh invention is the variable vane pump according to any one of the fourth to sixth inventions, wherein the end surface member is disposed away from the suction hole in the circumferential direction, and the working fluid in the compression chamber is It has a discharge hole for discharging, and the opening is arranged between the suction hole and the discharge hole in the circumferential direction.

In this variable vane pump, since the opening of the communication portion is between the suction hole and the discharge hole in the circumferential direction, the opening is less than in the case where the opening is at the same position as the suction hole or the discharge hole in the circumferential direction. Easy to install.

A variable vane pump according to an eighth invention is the variable vane pump according to any one of the first to seventh inventions, wherein a casing in which the cam ring is arranged is arranged on the pressing member side and in the outer space. It has a discharge hole for discharging the working fluid to the outside.

In this variable vane pump, since the working fluid discharged from the communicating portion to the outer space outside the cam ring in the radial direction is discharged from the discharge hole, the working fluid discharged from the communicating portion to the outer space radially outside the cam ring is discharged. There is no need to provide a new discharge hole.

As described in the above description, according to the present invention, the following effects can be obtained.

In the first invention, when the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member side and the working fluid in the compression chamber is hardly discharged from the discharge hole, the compression is performed. Since the chamber and the outer space communicate with each other, the working fluid in the compression chamber is easily discharged to the outer space as compared with the case where the compression chamber and the outer space do not communicate with each other. Therefore, a large amount of working fluid having a low temperature is supplied from the suction hole to the compression chamber, and the temperature in the compression chamber decreases. Therefore, it is possible to prevent the compression chamber from becoming hot when the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member side.

In the second invention, the compression chamber and the outer space communicate with each other by utilizing the fact that the cam ring moves from the position eccentric to the opposite side of the pressing member to the pressing member side. The outside space can be easily communicated.

In the third invention, since the communicating portion is a groove formed on the end surface on the cam ring side of the both end surfaces of the end surface member, it is easy to provide the communicating portion.

In the fourth aspect of the invention, since the opening of the communication part is arranged away from the suction hole in the circumferential direction, the working fluid supplied from the suction hole to the compression chamber is immediately discharged from the communication part as a shortcut. Can be prevented.

In the fifth aspect of the invention, since the distance between the opening of the communicating portion and the suction hole is longer than the circumferential length of all the compression chambers, the opening and the suction hole may be simultaneously opened in one compression chamber. Absent. Therefore, it is possible to more reliably prevent the working fluid supplied from the suction hole to the compression chamber from being discharged from the communication portion immediately after a shortcut.

In the sixth invention, since the distance between the opening of the communication portion and the cutout is longer than the circumferential length of all the compression chambers, the working fluid supplied from the cutout to the compression chamber is immediately short cut. Can be prevented from being discharged from the communication part.

In the seventh aspect of the invention, since the opening of the communication portion is between the suction hole and the discharge hole in the circumferential direction, the opening is compared with the case where the opening is at the same position as the suction hole or the discharge hole in the circumferential direction. It is easy to provide.

In the eighth aspect of the invention, since the working fluid discharged from the communicating portion to the outer space radially outside the cam ring is discharged from the discharge hole, the working fluid discharged from the communicating portion to the outer space radially outside the cam ring is discharged. There is no need to provide a new discharge hole.

It is a longitudinal cross-sectional view of the variable vane pump concerning embodiment of this invention. It is principal part sectional drawing along the II-II line | wire shown in FIG. (A) is a figure which shows the case where a cam ring exists in the position eccentric to the opposite side to a press member with respect to a rotor, (b) is a figure which shows the case where the center position of a cam ring and the center position of a rotor correspond. It is. It is the A section enlarged view shown in Drawing 3 (b). It is a top view of the 1st side board (end surface member).

Hereinafter, an embodiment of a variable vane pump according to the present invention will be described with reference to the drawings.

[Configuration of variable vane pump]
The variable vane pump 1 is used, for example, as a hydraulic pressure supply source for hydraulic equipment, and the outside is covered with a casing 2 as shown in FIGS. 1 and 2. Inside the casing 2, a rotating shaft 3 is rotatably supported by a bearing 2A and a bearing 2B. A cylindrical rotor 5 is attached to the rotary shaft 3 via a key 4 so as to be rotatable integrally with the rotary shaft 3. A plurality of slits 6 (13 in this variable vane pump 1) arranged in an annular shape are provided on the outer peripheral surface of the rotor 5. The plurality of slits 6 penetrates the rotor 5 in the axial direction and is provided along the radial direction, and are arranged at substantially equal intervals in the circumferential direction. An annular (annular) cam ring 7 is disposed on the outer side in the radial direction of the rotor 5.

In the plurality of slits 6, a plurality of vanes 8 (13 in this variable vane pump 1) disposed so as to be able to advance and retract in the radial direction in each slit 6 are disposed. The plurality of vanes 8 are in contact with the inner peripheral surface of the cam ring 7 by centrifugal force generated by the rotation of the rotor 5 to form a plurality of compression chambers 9. In this

variable vane pump

1, 13 compression chambers 9 are formed by two adjacent vanes 8, the rotor 5, the cam ring 7, and two side plates (first side plate 21 and second side plate 22) described later. Note that the rotor 5, the cam ring 7, the vane 8, and the like are arranged in a space having a circular shape in cross section formed by the inner peripheral surface 12 of the casing 2. Moreover, the rotating shaft 3, the rotor 5, and the vane 8 rotate in the arrow direction of FIG.

A pressing member 10 that contacts the outer peripheral surface of the cam ring 7 and presses the cam ring 7 from the radially outer side of the cam ring 7 is disposed on the outer side of the cam ring 7 in the radial direction. The pressing member 10 is disposed in a pressing member accommodating portion 13 that extends radially outward from the inner peripheral surface 12 of the casing 2. The pressing member accommodating portion 13 is formed with a discharge hole 14 for discharging the working fluid (for example, oil) in the outer space 11 to the outside.

As shown in FIG. 1, the pressing member 10 includes an elastic member 15 (a spring member in the variable vane pump 1) and a piston 16. A bolt member 17 is disposed on the opposite side of the pressing member 10 from the cam ring 7. In this variable vane pump 1, the bolt member 17 is displaced along the radial direction of the rotor 5, whereby the elastic force of the elastic member 15 acting on the cam ring 7 is changed by the piston 16, and the operation is discharged from the compression chamber 9. The fluid discharge pressure is adjusted. As shown in FIG. 1, in the variable vane pump 1, the cam ring 7 is arranged at a position eccentric to the rotor 5 on the side opposite to the pressing member 10. That is, the center position of the cam ring 7 is on the opposite side of the pressing member 10 with respect to the center position of the rotor 5. At this time, the outer peripheral surface of the cam ring 7 opposite to the pressing member 10 is in contact with the inner peripheral surface 12 of the casing 2.

2, a cylindrical first side plate 21 (end surface member) and a cylindrical second side plate 22 are disposed on both end surfaces of the cam ring 7 and the rotor 5. Through holes are formed in the center of the first side plate 21 and the second side plate 22, and the rotary shaft 3 is inserted through these through holes.

As shown in FIGS. 3 to 5, the first side plate 21 (end surface member) includes a suction hole 23 for supplying a working fluid (for example, oil) to the compression chamber 9 and a discharge hole for discharging the working fluid in the compression chamber 9. 24 and a communication portion 31 for discharging the working fluid in the compression chamber 9 to the outer space 11 on the radially outer side of the cam ring 7. The suction hole 23 is connected to a suction port (not shown), and the discharge hole 24 is connected to a discharge port (not shown).

The suction hole 23 is arranged on the left side in plan view with respect to a line L1 (see FIG. 5) obtained by extending the center line of the pressing member 10, and extends along the circumferential direction so as to communicate with the plurality of compression chambers 9. is doing. Therefore, the circumferential length of the suction hole 23 is longer than the circumferential length of each compression chamber 9. Here, the circumferential length of the compression chamber 9 refers to the circumferential length of the compression chamber 9 on the outermost radial direction. Of the both ends of the suction hole 23, the upstream end 25 in the rotational direction of the rotor 5 is a supply start point at which the supply of the working fluid to the compression chamber 9 is started, and the downstream end 26 in the rotational direction of the rotor 5. Is the supply end point at which the supply of the working fluid to the compression chamber 9 ends. Of the both end faces of the first side plate 21, the end face on the cam ring 7 side is, for example, V-shaped and extends from the upstream end 25 in the rotation direction of the suction hole 23 toward the second opening 33, which will be described later. A mold notch 27 (notch) is formed. By this notch 27, the working fluid is gradually supplied into the compression chamber 9 from the upstream side of the upstream end 25 in the rotational direction of the suction hole 23, so that the compression is performed at the upstream end 25 in the rotational direction of the suction hole 23. It is possible to prevent the pressure in the chamber 9 from rising rapidly. The notch 27 may pass through the first side plate 21.

The discharge hole 24 is disposed away from the suction hole 23 in the circumferential direction. Specifically, the discharge hole 24 is opposite to the suction hole 23 (plan view) with respect to a line L1 (see FIG. 5) obtained by extending the center line of the pressing member 10. On the right). The discharge holes 24 extend along the circumferential direction so as to communicate with the plurality of compression chambers 9. Therefore, the circumferential length of the discharge hole 24 is longer than the circumferential length of each compression chamber 9. Of the both ends of the discharge hole 24, the upstream end 28 in the rotation direction of the rotor 5 is a discharge start point at which the discharge of the working fluid from the compression chamber 9 is started, and the downstream end in the rotation direction of the rotor 5. Reference numeral 29 denotes a discharge end point at which the discharge of the working fluid from the compression chamber 9 ends. In addition, the circumferential distance between the rotation direction upstream end 25 of the suction hole 23 and the rotation direction downstream end 29 of the discharge hole 24, and the rotation direction downstream end 26 of the suction hole 23 and the discharge hole 24. The distance in the circumferential direction between the upstream end portion 28 in the rotational direction is longer than the circumferential length of the compression chamber 9 in the circumferential direction.

When the cam ring 7 moves to the pressing member 10 side from the position opposite to the pressing member 10 with respect to the rotor 5, the communication portion 31 starts from the state where the compression chamber 9 and the outer space 11 do not communicate with each other. And the outer space 11 are configured to change into a communication state. Here, the compression chamber 9 and the outer space 11 are actually in communication with each other by a slight gap between the cam ring 7 and the two side plates (the first side plate 21 and the second side plate 22). In the present invention, even if there is a slight gap between the cam ring 7 and the two side plates (the first side plate 21 and the second side plate 22), it is considered that the compression chamber 9 and the outer space 11 are not communicated with each other. .

The communication portion 31 is a groove extending along the radial direction, and is formed on the end surface on the cam ring 7 side of both end surfaces of the first side plate 21 (end surface member) and on the pressing member 10 side of the first side plate 21. ing. As shown in FIG. 5, the pressing member 10 side refers to the pressing member 10 side from a line L <b> 2 that is orthogonal to the line L <b> 1 that extends the center line of the pressing member 10 and passes through the center of the rotor 5 in a plan view. Point to.

As shown in FIG. 3 to FIG. 5, the communication portion 31 is a groove whose longitudinal length is longer than the width of the cam ring 7, and has a first opening 32 opened in the outer space 11 and an opening in the compression chamber 9. And a second opening 33 that can be used. This 2nd opening part 33 is equivalent to the opening part which can be connected to a compression chamber among communication parts in this invention. As shown in FIG. 3A, the first opening 32 is located when the cam ring 7 is eccentric to the opposite side of the pressing member 10 with respect to the rotor 5, and as shown in FIG. 3B. In any state when the center position of the cam ring 7 and the center position of the rotor 5 coincide, the outer space 11 is always open.

On the other hand, as shown in FIG. 3A, when the cam ring 7 is in a position eccentric to the opposite side of the pressing member 10 with respect to the rotor 5, the entire area of the second opening 33 is a cam ring in a plan view. 7 overlaps. Therefore, the second opening 33 is closed by the cam ring 7, and the second opening 33 does not open into the compression chamber 9. On the other hand, the center position of the cam ring 7 and the center position of the rotor 5 are determined from the position where the second opening 33 is eccentric to the opposite side of the pressing member 10 with respect to the rotor 5 (see FIG. 3A). When the cam ring 7 moves to some point (in fact, slightly before the position where the center position of the cam ring 7 and the center position of the rotor 5 match) until the matching position (see FIG. 3B), The second opening 33 is not blocked by the cam ring 7, and the second opening 33 opens into the compression chamber 9. As a result, the compression chamber 9 and the outer space 11 communicate with each other. Even when the cam ring 7 moves to a position where the center position of the cam ring 7 and the center position of the rotor 5 coincide with each other, the state in which the compression chamber 9 and the outer space 11 communicate with each other is continued.

Here, as shown in FIG. 3A, when the cam ring 7 is in a position eccentric to the opposite side of the pressing member 10 with respect to the rotor 5, the pressure in the compression chamber 9 is less than a predetermined value, The working fluid is supplied from the hole 23 to the compression chamber 9 and the working fluid in the compression chamber 9 is discharged from the discharge hole 24. In the variable vane pump 1, this state is referred to as a full flow state. On the other hand, when the pressure in the compression chamber 9 becomes equal to or higher than a predetermined value, such as during holding, and the pressure in the compression chamber 9 exceeds the elastic force of the elastic member 15, as shown in FIG. 7 and the center position of the rotor 5 coincide with each other, so that the working fluid in the compression chamber 9 is hardly discharged from the discharge hole 24. In the variable vane pump 1, this state is referred to as a dead head state.

In this variable vane pump 1, when the cam ring 7 is in a position eccentric to the opposite side of the pressing member 10 with respect to the rotor 5, that is, when the center position of the cam ring 7 coincides with the center position of the rotor 5 from the full flow state. That is, when the state changes to the dead head state, the compression chamber 9 and the outer space 11 do not communicate with each other, and the compression chamber 9 and the outer space 11 communicate with each other. The working fluid in the compression chamber 9 is more likely to leak into the outer space 11 as compared with a conventional variable vane pump without the above.

As shown in FIGS. 3 and 4, the second opening 33 (opening) of the communication portion 31 has an upstream end 25 in the rotation direction of the suction hole 23 and a downstream side in the rotation direction of the discharge hole 24 in the circumferential direction. It is arranged between the end portions 29. Accordingly, the second opening 33 of the communication portion 31 is disposed away from the suction hole 23 in the circumferential direction. Further, the distance between the second opening 33 in the circumferential direction and the upstream end 25 in the rotation direction of the suction hole 23 is longer than the circumferential length of each compression chamber 9, and the distance in the circumferential direction is The distance between the two openings 33 and the tip of the notch 27 is also longer than the circumferential length of each compression chamber 9.

Moreover, as shown in FIG. 1, since the 1st opening part 32 of the communication part 31 exists in the vicinity of the press member 10, ie, between the both ends 13a and 13b of the press member accommodating part 13 about the circumferential direction, the communication part 31 is provided. The oil discharged as a jet from the first opening 32 is less likely to hit the inner peripheral surface 12 of the casing 2. Therefore, the oil discharged as a jet from the first opening 32 of the communication portion 31 is prevented from hitting the inner peripheral surface 12 of the casing 2 and applying a load to the casing 2. Further, since the first opening 32 of the communication portion 31 is located between the both ends 13a and 13b of the pressing member accommodating portion 13 in the vicinity of the discharge hole 14 and in the circumferential direction, the first opening 32 is discharged from the first opening 32 of the communication portion 31. Oil is easily discharged from the discharge hole 14 to the outside.

[Operation of variable vane pump]
Next, the operation of the variable vane pump 1 will be described with reference to FIG. In the variable vane pump 1, as shown in FIG. 3A, when the cam ring 7 is in a position eccentric to the opposite side to the pressing member 10 with respect to the rotor 5, the operation is started and the rotor 5 rotates. The vane 8 disposed in the slit 6 advances and retreats depending on the position, and the compression chamber 9 gradually expands on the suction side where the suction hole 23 is disposed, and the working fluid is supplied from the suction hole 23 to the compression chamber 9. The compression chamber 9 is gradually reduced on the discharge side where the discharge hole 24 is disposed, and the working fluid in the compression chamber 9 is discharged from the discharge hole 24 (full flow state). In this case, the first opening 32 of the communication portion 31 opens to the outer space 11, but the second opening 33 (opening) of the communication portion 31 does not open to the compression chamber 9. There is almost no working fluid (for example, oil) discharged from the communicating portion 31 to the outer space 11. Therefore, the working fluid in the compression chamber 9 is not wasted.

On the other hand, when the pressure in the compression chamber 9 becomes equal to or higher than a predetermined value, for example, when the pressure is maintained, and the pressure in the compression chamber 9 exceeds the elastic force of the elastic member 15, the cam ring 7 contacts the rotor 5 with the pressing member 10. It moves from the position eccentric to the opposite side to the pressing member 10 side. When the center position of the cam ring 7 and the center position of the rotor 5 coincide with each other, the size of the compression chamber 9 does not change even when the rotor 5 rotates, and the working fluid in the compression chamber 9 is not discharged ( Dead head condition). In this case, since the first opening 32 and the second opening 33 of the communication part 31 open to the outer space 11 and the compression chamber 9, respectively, the working fluid in the compression chamber 9 flows from the communication part 31 to the outer space. 11 is easy to be discharged. As a result, since the new working fluid is supplied to the compression chamber 9 from the suction hole 23 by the amount of the working fluid discharged from the communication portion 31 to the outer space 11, the compression chamber 9 is prevented from being heated to a high temperature.

In a variable vane pump in which the processing accuracy of the metal member is not so high, even if the center position of the cam ring coincides with the center position of the rotor and the working fluid in the compression chamber is not discharged from the discharge hole, Since the working fluid in the compression chamber leaks into the outer space from the gap between the members, the working fluid having a low temperature is supplied to the compression chamber. Therefore, it is easier to prevent the compression chamber from becoming hot when the communication portion 31 of the present invention is present, but even when the communication portion 31 of the present invention is not present, the compression chamber is less likely to become hot.

However, due to the recent improvement in processing accuracy, the variable vane pump with high processing accuracy of the metal member has a sufficiently small gap between the cam ring and the end surface member, so when the center position of the cam ring matches the center position of the rotor, The working fluid hardly leaks from the flow path between the cam ring and the end face member. Therefore, the working fluid stays in the compression chamber, and the compression chamber becomes high temperature. Therefore, by applying the communication portion 31 of the present invention, it is possible to obtain a high effect as compared with a variable vane pump in which the processing accuracy of the metal member is not so high.

<Characteristics of variable vane pump according to this embodiment>
The variable vane pump 1 according to the present embodiment has the following characteristics.

In the variable vane pump 1 of the present embodiment, the cam ring 7 moves to the pressing member 10 side from the position eccentric to the opposite side of the pressing member 10 with respect to the rotor 5, and the working fluid in the compression chamber 9 is almost discharged from the discharge hole 24. Since the compression chamber 9 and the outer space 11 communicate with each other when no discharge occurs, the working fluid in the compression chamber 9 flows into the outer space 11 as compared with the case where the compression chamber 9 and the outer space 11 do not communicate with each other. Easily discharged. Therefore, a large amount of low-temperature working fluid is supplied to the compression chamber 9 from the suction hole 23, and the temperature in the compression chamber 9 decreases. Therefore, it is possible to prevent the compression chamber 9 from becoming hot when the cam ring 7 moves to the pressing member 10 side from a position eccentric to the rotor 5 on the opposite side to the pressing member 10.

Further, in the variable vane pump 1 of the present embodiment, the compression chamber 9 and the outer space 11 are utilized by using the fact that the cam ring 7 moves to the pressing member 10 side from the position eccentric to the opposite side to the pressing member 10 with respect to the rotor 5. Therefore, the flow path connecting the compression chamber 9 and the outer space 11 can be enlarged with an easy configuration.

Moreover, in the variable vane pump 1 of this embodiment, since the communication part 31 is a groove | channel formed in the end surface by the side of the cam ring 7 among the both end surfaces of the 1st side board 21 (end surface member), it is easy to provide the communication part 31. .

Further, in the variable vane pump 1 of the present embodiment, the second opening 33 (opening) of the communication portion 31 is disposed away from the suction hole 23 in the circumferential direction, and thus is supplied from the suction hole 23 to the compression chamber 9. Therefore, it is possible to prevent the working fluid from being discharged from the communication part 31 immediately after a shortcut.

Further, in the variable vane pump 1 of the present embodiment, the distance between the second opening 33 (opening) of the communication part 31 and the suction hole 23 is longer than the circumferential length of all the compression chambers 9. The second opening 33 and the suction hole 23 of the part 31 do not open simultaneously into one compression chamber 9. Accordingly, it is possible to more reliably prevent the working fluid supplied from the suction hole 23 to the compression chamber 9 from being discharged from the communication portion 31 immediately after a shortcut.

In the variable vane pump 1 of the present embodiment, the distance between the second opening 33 (opening) and the notch 27 (notch) of the communication portion 31 is longer than the circumferential length of all the compression chambers 9. Therefore, it is possible to prevent the working fluid supplied from the notch 27 to the compression chamber 9 from being discharged from the communication portion 31 immediately after a shortcut.

Further, in the variable vane pump 1 of the present embodiment, since the second opening 33 (opening) of the communication part 31 is between the suction hole 23 and the discharge hole 24 in the circumferential direction, the second opening 33 is circumferential. Compared to the case where the suction hole 23 or the discharge hole 24 is located in the same direction, the second opening 33 is easily provided.

In the variable vane pump 1 of the present embodiment, the casing 2 in which the cam ring 7 is disposed has a discharge hole 14 that is disposed on the pressing member 10 side and discharges the working fluid in the outer space 11 to the outside. There is no need to newly provide a discharge hole for discharging the working fluid discharged from the communication portion 31 to the outside of the cam ring 7.

As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

In the above-described embodiment, the case where the compression chamber 9 and the outer space 11 are communicated with each other by the communication portion 31 formed on the first side plate 21 (end surface member) has been described, but the cam ring 7 is pressed against the rotor 5. As long as the compression chamber 9 and the outer space 11 communicate with each other when moving from the position eccentric to the side opposite to the member 10 to the pressing member 10 side, the communicating portion may be formed on the cam ring. For example, the communication portion is a through hole that communicates the inner peripheral surface and the outer peripheral surface of the cam ring, or a through groove that is disposed on the end surface of the cam ring and communicates the inner peripheral surface and the outer peripheral surface of the cam ring, In FIG. 3A, the opening on the inner peripheral surface of the cam ring is closed by the rotor, and in the dead head state (see FIG. 3B), the opening on the inner peripheral surface of the cam ring is opened. It may be.

In the above-described embodiment, when the communication portion 31 is disposed on the first side plate 21 (end surface member), the second opening 33 (opening portion) of the communication portion 31 rotates the suction hole 23 in the circumferential direction. Although the case where it arrange | positions between the direction upstream edge part 25 and the rotation direction downstream edge part 29 of the discharge hole 24 was demonstrated, as long as a communication part exists in the press member side, a communication part may be anywhere. . Therefore, if the communication portion does not communicate with the discharge hole, the communication portion may be in the same position as the discharge hole in the circumferential direction, and if the communication portion does not communicate with the suction hole, the communication portion is in the circumferential direction. It may be in the same position as the suction hole.

Moreover, in the above-described embodiment, the case where the circumferential lengths of the plurality of compression chambers 9 are all the same by forming the plurality of slits 6 at substantially equal intervals in the circumferential direction has been described. The lengths in the circumferential direction of the plurality of compression chambers 9 may be different because 6 is not formed at substantially equal intervals in the circumferential direction. In that case, it is preferable that the distance between the opening of the communication portion and the suction hole is longer than the circumferential length of all the compression chambers, and the distance between the opening of the communication portion and the notch is It is preferable that the length is longer than the circumferential length of all the compression chambers.

In the above-described embodiment, the case where 13

vanes

8 and 13 compression chambers are formed has been described, but any number of vanes and compression chambers may be used.

Moreover, although the above-mentioned embodiment demonstrated the case where it had the notch 27 (notch) extended toward the 2nd opening part 33 (opening part) side of the communication part 31 from the suction hole 23, there is no notch. May be.

In the above-described embodiment, the communication portion 31 is a groove. However, the communication portion may be a hole formed in the end surface member.

Moreover, although the above-mentioned embodiment demonstrated the case where the discharge hole 14 was formed in the press member accommodating part 13 of the casing 2, as long as the discharge hole is a press member side, it may be formed anywhere in the casing.

In the above-described embodiment, the case where the suction hole 23, the discharge hole 24, and the communication portion 31 are formed in the first side plate 21 (end surface member) has been described. However, the suction hole, the discharge hole, and the communication portion are cam rings. And it may be arranged on either of the end face members arranged on both end faces of the rotor. Therefore, for example, the suction hole, the discharge hole, and the communication portion may be disposed on the first side plate and the second side plate, respectively. For example, the suction hole and the discharge hole are disposed on the first side plate, and the communication portion is provided on the second side plate. It may be arranged.

If the present invention is used, it is possible to prevent the compression chamber from becoming hot when the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member side.

DESCRIPTION OF SYMBOLS 1 Variable vane pump 2 Casing 5 Rotor 6 Slit 7 Cam ring 8 Vane 9 Compression chamber 10 Pressing member 11 Outer space 14 Discharge hole 21 1st side plate (end surface member)
23 Suction hole 24 Discharge hole 27 Notch 31 Communication part 33 2nd opening part (opening part)

Claims

An annular cam ring;
A rotor having a plurality of slits arranged on the inner surface of the cam ring and spaced apart in the circumferential direction on the outer peripheral surface;
A plurality of vanes arranged in the plurality of slits so as to be capable of advancing and retreating, and abutting the inner peripheral surface of the cam ring to form a plurality of compression chambers;
A pressing member that is disposed radially outside the cam ring and presses the cam ring;
When the cam ring moves from the position eccentric to the opposite side to the pressing member to the pressing member, the compression chamber and the outer space on the radially outer side of the cam ring do not communicate with each other. A variable vane pump comprising: a communication portion configured to change to a state in which the chamber and the outer space communicate with each other.
Having an end face member disposed on an end face of the cam ring and the rotor;
The communication part is
The cam ring is closed when the cam ring moves to the pressing member side from a position eccentric to the opposite side of the pressing member with respect to the rotor while being arranged on the pressing member side of the end surface member. The variable vane pump according to claim 1, wherein the compression chamber and the outer space are communicated with each other by changing from a state to a state where the cam ring is not blocked.
3. The variable vane pump according to claim 2, wherein the communicating portion is a groove formed in an end face on the cam ring side of both end faces of the end face member.
The end face member has a suction hole for supplying a working fluid to the compression chamber;
4. The variable vane pump according to claim 2, wherein an opening that can communicate with the compression chamber in the communication portion is disposed away from the suction hole in a circumferential direction. 5.
The variable vane pump according to claim 4, wherein a distance between the opening and the suction hole is longer than a circumferential length of all the compression chambers.
The end face member has a notch extending from the suction hole toward the opening,
The variable vane pump according to claim 5, wherein a distance between the opening and the notch is longer than a circumferential length of all the compression chambers.
The end face member is disposed apart from the suction hole in the circumferential direction, and has a discharge hole for discharging the working fluid in the compression chamber;
The variable vane pump according to claim 4, wherein the opening is disposed between the suction hole and the discharge hole in the circumferential direction.
The casing in which the cam ring is disposed has a discharge hole that is disposed on the pressing member side and discharges the working fluid in the outer space to the outside. Variable vane pump.