JP2009047133A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump simplified in tuning of intake properties of a pump by allowing adjustment of a cover side feeding passage. <P>SOLUTION: A cover C closing a side face of a body consists of a first plate 20 having intake ports 22b, 22c and a communicating port 22a continuous to the fluid source side passing therethrough, and a second plate 21 with a passage groove 27 for connecting the intake ports 22b, 22c and the communicating port 22a. The surface 21a with the passage groove of the second plate 21 is stacked on the first plate 20, the intake ports 22b, 22c of the first plate 20 are attached in line with intake stroke sections A, A of the body, and then, the passage groove 27 of the second plate 21 is made as the cover side feeding passage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vane pump in which a side surface of a body is closed with a cover.

A conventional vane pump is shown in FIGS.
As shown in FIG. 6, the vane pump is configured by closing the side surface of the body 1 with a cover 2, and the bore a in the body 1 has an elliptical inner wall 3a as shown in FIG. A cam ring 3 is provided. A rotor 4 is provided in the cam ring 3, and a plurality of vanes 5 are arranged in the rotor 4 in a radial manner and are incorporated in the rotor 4 so as to be able to protrude and retract.
The body 1 and the cover 2 are formed with shaft holes 6a and 6b, the first bearing member 7 is provided in the shaft hole 6a on the body 1 side, and the second bearing member is provided on the shaft hole 6b on the cover 2 side. 8 is provided. The drive shaft 9 is rotatably supported by the first bearing member 7 and the second bearing member 8. The drive shaft 9 passes through the central portion of the rotor 4, and the penetrated portion is fixed to the rotor 4.

Further, side plates 10 are provided on the side surfaces of the cam ring 3 and the rotor 4. The rotor 4 is held between the cover 2 and the side plate 10 with a slight clearance that does not cause resistance to rotation of the rotor 4 and does not deteriorate pump efficiency.
In FIG. 7, reference symbol p denotes a positioning pin provided on the side plate 10, and the position of the cam ring 3 relative to the body 1 is determined by the positioning pin p. However, the positioning pin p may be provided on the cover side.

  In such a vane pump, when the drive shaft 9 is rotated in the k direction in FIG. 7 by the operation of a drive source (not shown), the rotor 4 is rotated together with the drive shaft 9. When the rotor 4 rotates, the vane 5 protrudes and its tip is pressed against the inner wall 3 a of the cam ring 3. However, since the inner wall 3a of the cam ring 3 to which the tip of the vane 5 is pressed has an elliptical shape as shown in FIG. 7, the vane 5 protrudes from the rotor 4 according to the shape of the inner wall 3a. Repeat storage.

Further, when the tip of the vane 5 is pressed against the inner wall 3 a of the cam ring 3, independent chambers are formed between the vanes 5, and the volume of these chambers changes according to the rotation of the rotor 4. That is, in the portion A indicated by the one-dot chain line in FIG. On the other hand, in the part B indicated by the one-dot chain line in FIG. 7, the vane 5 is housed in the rotor 4 and the volume of the chamber is reduced.
Since the fluid is sucked into the chamber when the volume of the chamber is enlarged, the range of the alternate long and short dash line A is defined as a suction stroke portion A.
Further, since the fluid in the chamber is discharged when the volume of the chamber is reduced, the range of the alternate long and short dash line B is set as the discharge stroke portion B.

  As described above, when the rotor 4 rotates, the suction stroke and the discharge stroke are alternately repeated. The fluid sucked into the chamber in the suction stroke is guided to the high pressure chamber 12 through the discharge holes 11 and 11 formed in the side plate 10 by reducing the volume of the chamber in the discharge stroke. The pressurized fluid is discharged to the outside through a passage (not shown).

On the other hand, fluid is supplied to the suction stroke portion A from the outside. In order to guide the fluid to the suction stroke portion A, a body side supply passage 13 connected to the fluid source side is formed in the body 1 as shown in FIGS. 6 and 7, and the cover 2 is formed as shown in FIG. A cover-side supply passage 14 is formed. The body side supply passage 13 and the opening 14a of the cover side supply passage 14 are continuous.
FIG. 8 shows the side surface 2a of the cover 2 on the body 1 side. As shown in the drawing, the side surface 2a has an opening 14a and suction ports 14b and 14c. In addition, a Y-shaped cover-side supply passage 14 that communicates the opening 14a with the suction ports 14b and 14c is formed inside the cover 2.
The opening 14a formed in the side surface 2a is made to coincide with the body side supply passage 13, and the suction ports 14b and 14c are made to coincide with the suction stroke portions A and A of FIG. 1, the fluid is supplied from the pair of suction ports 14b and 14c to the pair of left and right suction strokes A and A on the body 1 side.
JP 2004-028014 A

  In the conventional vane pump, fluid is supplied from the cover side supply passage 14 formed in the cover 2 to the pair of suction stroke portions A and A of the body 1 through the suction ports 14b and 14c. However, depending on the characteristics of the pump, there may be a difference in the flow rate to the left and right suction stroke portions A and A. In this way, if there is a difference in the suction flow rate between the pair of suction stroke parts A and A, the pressure balance in the body 1 is lost, pulsation occurs in the discharge of the vane pump, and the members rattle. Inconvenience may occur.

In such a case, by adjusting the cross-sectional area and shape of the cover-side supply passage 14, the suction amounts in the suction stroke portions A and A must be adjusted to tune the suction characteristics of the pump. However, as described above, there are only three openings on the side surface 2 a of the cover 2, and the cover-side supply passage 14 is formed inside the cover 2, so adjustment thereof is almost impossible. It was.
In addition, the cover side supply passage 14 needs to be formed by casting because of its structure. Therefore, the manufacturing method of the cover 2 is limited in the processing method, and the processing cost is increased accordingly.
An object of the present invention is to provide a vane pump that enables adjustment of the cover side supply passage, facilitates tuning of the suction characteristics of the pump, and realizes cost reduction.

  According to a first aspect of the present invention, the body is provided with a rotor that rotates integrally with the drive shaft, and a plurality of vanes incorporated so as to be able to project and retract in a radial direction of the rotor, and a chamber formed by each of the vanes includes a rotor. In order to supply a fluid to the suction stroke portion, a cover that closes the side surface of the body includes a pair of suction stroke portions that increase in volume with the rotation of the cylinder and a pair of discharge stroke portions that reduce the volume. And the cover includes a first plate having a pair of suction ports and a communication port for connection to the fluid source side, a pair of suction ports and the communication ports. A second plate having a passage groove connected to the opening, and the passage plate forming surface of the second plate is laminated on the first plate, and the first plate Each suction port over preparative, mounted to match with each intake stroke portion of said body, characterized in that to constitute a cover-side supply passage by a passage groove of the second plate.

The second invention is premised on the first invention and is characterized in that a seal member is interposed between the first plate and the second plate.
The third invention is premised on the second invention and is characterized in that the sealing member is in the form of a sheet.

According to the first to third inventions, the cover for closing the side surface of the body incorporating the rotor is configured by stacking the first and second plates, and the suction port is configured by the through hole of the first plate. In addition, since the cover-side supply passage is constituted by the passage groove of the second plate, each adjustment is facilitated.
For example, the size and shape of the suction port can be adjusted by adjusting a through hole penetrating the first plate. The groove width and depth of the passage groove of the second plate can also be adjusted from the opening side of the groove.
As described above, since the size of the suction port and the passage groove can be adjusted, the flow rate supplied to the suction stroke portion through the cover side supply passage can be adjusted, and the pump suction characteristics can be easily tuned. .

  In addition, the cover of the conventional vane pump has to be manufactured by casting using a core in order to form a supply passage inside. Casting using a core has a higher manufacturing cost than press processing, and as a result, the manufacturing cost of the vane pump may increase. However, the cover of the present invention is a plate member. In addition, since the port and the passage groove can be formed by press working, the manufacturing cost of the cover can be greatly reduced. Therefore, not only the cover but also the manufacturing cost of the vane pump itself can be greatly reduced.

According to the second invention, it is possible to more easily ensure the sealing performance between the first plate and the second plate.
In the third aspect of the invention, since the sealing member is formed into a sheet shape, the laminated surfaces of the first plate and the second plate that interpose the sealing member are all flat, and processing for attaching the sealing member is unnecessary. is there. For example, when an O-ring is used as a seal member, it is necessary to form a seal groove for providing an O-ring on at least one of the first plate and the second plate. If it ’s in the shape, you do n’t have to. If processing such as seal grooves is necessary, not only will the number of processing steps increase, but the thickness of the plate on the side where the grooves will be formed will also be required to some extent, which may increase the overall size of the sheet. Such a problem does not occur if a sealing member in the form of a tube is used.

An embodiment of the present invention will be described below. 1 to 5 show a cover C of the vane pump of the present invention.
As shown in FIG. 1, the cover C of this embodiment is configured by laminating a first plate 20, a sheet-like seal member S, and a second plate 21.
The cover C is attached to the side surface of the body of the vane pump and closes the side surface of the body. The body of this embodiment is the same as the body 1 of the conventional example shown in FIGS. Therefore, detailed description of the body 1 in this embodiment is omitted.

As shown in FIG. 1, the first plate 20 constituting the cover C of this embodiment has a surface 20a on the surface opposite to the second plate 21, and a back surface 20b on the opposite side. It is a plate member in which a communication port 22a and suction ports 22b and 22c are formed as through holes penetrating up to 20b (see FIG. 2).
And the said communication port 22a is formed in the position connected with the body side supply channel | path 13 (refer FIG. 7), and the suction ports 22b and 22c are respectively in the position corresponding to the suction stroke parts A and A on the body 1 side. Forming. The communication port 22a corresponds to a communication port connected to the fluid source side of the present invention.

Further, the first plate 20 is formed with a bolt insertion hole 23 for inserting a set bolt for fixing the cover C to the body 1 along the periphery.
In the figure, reference numerals 24 to 25 denote grooves formed on the surface 20a of the first plate 20, which keeps the balance of pressure in the body 1 and applies high pressure to the vane holding portion in which the vane 5 of the rotor 4 is incorporated. In order to restrict the relative position between the side plate 10 and the cover C, the reference numeral 26 is used to insert a pin p standing on the side plate 10 side and penetrating the cam ring 3. It is a pin hole.
The through holes 22a and the suction ports 22b and 22c of the first plate 20 can be formed by punching or cutting a metal plate member that is a material of the first plate 20. it can.
The size and shape of the communication port 22a and the suction ports 22b and 22c once penetrated can be easily adjusted by cutting the inner periphery of the opening.

On the other hand, the second plate 21 is formed by pressing a metal material having a thickness smaller than that of the first plate 20, as shown in FIGS.
As shown in FIG. 1, the second plate 21 is formed with a Y-shaped passage groove 27 on the passage groove forming surface 21a of the present invention on the first plate 20 side, and the bolt insertion holes 23 are formed along the outer periphery. Forming.

4 is a perspective view seen from the back surface 21b side of the second plate 21, but in this embodiment, the passage groove 27 is pressed, so the back surface 21b of the second plate 21 has As shown in the figure, a convex portion corresponding to the depth of the passage groove 27 is formed.
When the base end of the Y-shaped passage groove 27 is 27a, one end branched into two branches is 27b, and the other end is 27c, each end portion of the passage groove 27 is the first plate 20. It corresponds to the communication port 22a and the suction ports 22b and 22c formed in the above. That is, when the second plate 21 is overlapped with the first plate 20 and the bolt insertion holes 23 are aligned, the base end 27a and the communication port 22a (see FIG. 2) of the first plate 20 are aligned, 27b and one suction port 22b are aligned, and the other distal end 27c is aligned with the other suction port 22c.

In this embodiment, the passage groove 27 is formed by pressing, but the method of forming the second plate 21 is not limited to pressing. Since the passage groove 27 of the second plate 21 is on the suction side and high pressure does not act, the second plate 21 having the passage groove 27 can be formed by, for example, resin molding.
The passage groove 27 can also be adjusted in width and depth by being formed once and then partially pressed or cut.

Further, the sheet-like sealing member S interposed between the first plate 20 and the second plate 21 has a through hole 28 in the center and a bolt insertion hole 23 along the periphery as shown in FIG. It is a member. The through hole 28 is sized so that the passage groove 27 of the second plate 21 can be accommodated on the inner peripheral side thereof.
Such a sealing member S can be easily formed by punching a rubber sheet.

  And the said sealing member S is piled up on the back surface 20b of the said 1st plate 20, and the cover groove | channel formation surface 21a of the 2nd plate is further piled up, and the cover C is comprised, This is utilized using the said bolt insertion hole 23. If attached to the body 1, the vane pump of the embodiment is completed. In the vane pump, the suction ports 22b and 22c of the first plate 20 correspond to the suction stroke portions A and A (see FIG. 7), respectively, and the communication port 22a of the first plate 20 is connected to the body side supply passage 13 and These passage grooves 27 constitute a cover side supply passage of the vane pump.

In the vane pump of this embodiment, when the suction characteristics need to be tuned, the size of the suction ports 22b and 22c of the first plate 20 is adjusted, or the passage groove 27 of the second plate 21 is adjusted. it can.
If tuning cannot be achieved by adjusting the first and second plates 20 and 21, the suction characteristics can be improved by replacing one of the first and second plates 20 and 21. You can also tune it.

  Further, the first and second plates 20 and 21 and the sheet-like seal member S constituting the cover C do not have a passage that does not appear on the surface like the cover 2 of the conventional example. There is no need to manufacture by casting using. Therefore, the manufacturing cost of the cover can be kept lower than when the cover is manufactured by casting.

In addition, although this embodiment demonstrated the example using the sheet-like sealing member S, a sealing member is not restricted to a sheet-like thing. For example, an O-ring may be used.
However, when an O-ring is used, it is necessary to form a seal groove for providing the O-ring in the first plate 20 or the second plate 21.
On the other hand, in the case of the sheet-like sealing member S as described above, a special member for providing the sealing member S on both the opposing surfaces 20b and 21a of the first plate 20 and the second plate 21 interposing it. There is a merit that processing is unnecessary.
Alternatively, a sheet-like sealing member can be formed by injecting resin into a gap between the laminated surfaces where the first plate 20 and the second plate 21 are laminated and curing the resin.

  Furthermore, as long as the sealing performance between the first plate 20 and the second plate 21 can be secured, it is not necessary to provide a special sealing member. For example, in a state where the first plate 20 is made of metal and the second plate 21 is made of resin and the plates 20 and 21 are in contact with each other, the contact surface is overheated, or one or both of the contact surfaces are overheated. The surface 21a, which is the formation surface of the passage groove 27 of the second plate 21, can be brought into close contact with the back surface 20b of the first plate 20 by welding.

It is a perspective view of the cover of an embodiment. It is the figure which showed the back surface of the 1st plate. It is the figure which showed the channel groove formation surface of the 2nd plate. It is the perspective view seen from the back surface side of the 2nd plate. It is a top view of a sheet-like sealing member. It is sectional drawing of the vane pump of a prior art example. It is the VII-VII sectional view taken on the line of FIG. It is a body side side view of the cover of a prior art example.

Explanation of symbols

20 First plate 21 Second plate S Sheet-like sealing member 22a Communication port 22b Suction port 22c Suction port 27 Passage groove A Suction stroke portion

Claims (3)

  The body is provided with a rotor that rotates integrally with the drive shaft and a plurality of vanes incorporated so as to be able to project and retract in the radial direction of the rotor, and a chamber formed by each of the vanes has a volume as the rotor rotates. A cover having a pair of suction stroke portions for enlarging the volume and a pair of discharge stroke portions for reducing the volume, and a cover closing the side surface of the body has a cover side supply passage for supplying fluid to the suction stroke portion. In the formed vane pump, the cover includes a pair of suction ports and a first plate that penetrates the communication port for connection to the fluid source side, and a passage groove that connects the pair of suction ports and the communication port. A second plate formed and laminating a passage groove forming surface of the second plate on the first plate, and each suction of the first plate Ports, attached to match the respective intake stroke portions of the body, to constitute a cover-side supply passage by a passage groove of the second plate vane pump.   The vane pump according to claim 1, wherein a seal member is interposed between the first plate and the second plate.   The vane pump according to claim 2, wherein the sealing member has a sheet shape.

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