JP3855100B2 - Vane pump - Google Patents

Description

[0001]
[Industrial application fields]
  The present invention relates to a vane pump, and more particularly to a balanced vane pump in which a vane ring is interposed on the inner end side of each vane.
[0002]
[Prior art]
  The basic configuration of the vane pump is that a plurality of vane storage grooves are formed radially in the internal rotor, and plate-like vanes are stored in these vane storage grooves so that they can freely enter and exit. In this case, the outer end surfaces of the vanes are adjacent to each other so that the outer end surfaces of the vanes are alternately brought into sliding contact with the inner surface of the cam ring corresponding to the suction stroke and the discharge stroke. The volume of each room formed by the respective vanes and the cam ring or the like is relatively changed. And this kind of vane pump performs the suction and discharge of the fluid using the fact that the volume of each room changes as described above.
[0003]
  Each vane must come in and out freely toward the cam surface of the cam ring in order to form a chamber whose volume changes by each vane and the cam ring, etc., and to make the outer end surface of each vane slidably contact the inner surface of the cam ring. Don't be. In the conventional general vane pump, each vane enters and exits by two kinds of forces, that is, centrifugal force caused by rotation of the rotor and force caused by fluid pressure guided to the inner end face of the vane.
[0004]
  However, these centrifugal force and fluid pressure work only while the vane pump is operating, and cannot be expected at the time of starting. In particular, at the beginning of startup when the pump and piping are not filled with fluid, vane protrusion must be performed only by centrifugal force. Moreover, this centrifugal force is also sufficient because hydraulic oil is used as a fluid and the viscosity of the hydraulic oil remaining between each vane and the rotor increases when the hydraulic oil is used in severe winter. I may not.
[0005]
  Furthermore, if the fluid tank is located below the vane pump and this vane pump has not been used for a long time, the fluid in the pump and piping has flowed down into the tank. In this case, sufficient pump operation is not exhibited, and the fluid discharge response is also deteriorated. Moreover, if the above-mentioned hydraulic oil is used in severe winter when its viscosity increases, the poor responsiveness of hydraulic oil discharge at the start of startup cannot be further eliminated, and this kind of vane pump is required at the start of startup. The oil discharge pressure to be obtained cannot be obtained in a short time and reliably.
[0006]
  In order to solve the above problem, in a conventional vane pump, for example, a vane pump proposed in Japanese Patent Application Laid-Open No. 10-306783, as shown in FIG. A cam mechanism 15 that pushes each vane 5 radially outward from the rotational axis of the rotor 4 is provided.
[0007]
  As a result, as described in paragraph 9 and subsequent paragraphs of the above publication, “When the rotor 4 starts rotating when the pump is started, the back portion of the vane 5 is slidably pushed out to the cam mechanism 15. Even if each vane 5 cannot supply sufficient pressure to the back (even if the viscosity of the oil that generates this pressure is high), each vane 5 is reliably pushed out and is required for the balanced vane pump. It is considered that the action or the effect that “the oil discharge can be obtained reliably in a short time” can be obtained.
[0008]
  However, in the conventional pane pump shown in FIG. 6, the problem due to the contact between each vane 5 and the cam mechanism 15 is not considered at all.
[0009]
  That is, during the rotation of this type of vane pump, FIG.Shown inIn the discharge stroke, that is, the small diameter stroke of the inner peripheral surface of the cam ring, not only the pushing back force to the cam mechanism 15 side by the cam ring inner peripheral surface is applied to each vane 5, but also the discharge pressure in the discharge stroke is applied. The fact that each vane 5 is pushed toward the shaft driving the vane pump by these two forces and the vane is separated from the cam ring is called a “jumping phenomenon”. In the conventional Pane pump shown in FIG. 6, no consideration is given to the fact that a large frictional force is generated between the cam mechanism 15 and the cam mechanism 15.
[0010]
  As described above, if wear or breakage occurs on the back of the inner diameter side of the vane 5 or the outer surface of the cam mechanism 15, not only the desired effect can be obtained, but also the wear powder travels in the pump. It becomes a cause to cause a failure in each place.
[0011]
  Furthermore, if it is going to allow the contact and collision between each vane 5 and the cam mechanism 15, it is necessary to form the cam mechanism 15 with the same material as each vane 5, resulting in a problem of cost increase. In order to solve the contact between each vane 5 and the cam mechanism 15, it may be possible to widen the distance or gap between the two, but the contact of each vane 5 due to the jumping described above can be avoided, but suction is performed. It is considered that the amount of each vane popping out in the region is reduced, which causes a problem that the suction performance at the time of cold start is lowered.
[0012]
  Therefore, the present inventor has made various studies on how to prevent wear and breakage of each vane and vane ring (cam mechanism in the conventional example) during rotation in this type of vane pump. As a result, the present invention has been completed.
[0013]
[Problems to be Solved by the Invention]
  The present invention has been made in view of the above circumstances, and the problem to be solved is to prevent wear and breakage due to jumping phenomenon in each vane and vane ring during rotation of this kind of vane pump. It is.
[0014]
  That is, first of allIn item 1The object of the invention is to make the portion corresponding to the suction region of the cam ring substantially similar to the cam surface of the cam ring, and the portion corresponding to the other discharge region to be similar to the cam surface. No matter what position the fluid tank is placed by simply assembling an annular vane ring that is recessed toward the shaft from the wire to at least one of the side plate or the side cover, A vane pump that does not wear or break regardless of the situation even at low temperatures when the viscosity of the nozzle increases is sometimes provided.
[0015]
  Also billedSection 2The object of the present invention is the above claim.Same as item 1It is another object of the present invention to provide a vane pump that can achieve the above-mentioned objects and that hardly causes mechanical loss due to the presence of the vane ring.
[0016]
[Means for Solving the Problems]
  In order to solve the above problems, first, the means taken by the invention according to claim 1 will be described with reference numerals used in the description of the embodiments described later.
  “A rotor 16 housed in a space formed by the side plate 12 and the cam ring 13 in the case 11 and rotated via the shaft 18, a plurality of vane housing grooves 16 a formed radially on the rotor 16, In the vane pump 10 provided with the vane 14 that is inserted and removably inserted into the vane storage grooves 16a.
  One end side of an annular vane ring 17 is fitted into a ring storage groove 12a formed on at least one inner surface of either the side plate 12 or the side cover 15 covering the space, and the other end side of the vane ring 17 is fitted. A portion of the inner end face of each vane 14 can be supported on the outer face of
  The annular vane ring 17 is made to be substantially similar to the cam surface 13a of the cam ring 13 in the portion corresponding to the suction region of the cam ring 13, and the portion corresponding to the other discharge region is connected to the cam surface 13a. To be a shape that is recessed toward the shaft 18 side from the similar line 17aAnd
  In addition, the portion of the annular vane ring 17 on the discharge region side near the portion after completion of the suction stroke of the suction region is set to a substantially linear portion 17b, and the linear portion 17b is directed to the suction region of the vane ring 17. It was made to continue smoothlyVane pump 10 "
It is.
[0017]
  That is, first, the vane pump 10 according to the first aspect has the same configuration as that of a conventionally used vane pump except for the vane ring 17 and the ring housing groove 12a necessary for the vane ring 17. In addition, the vane ring 17 and the ring storage groove 12a of the vane pump 10 employ one piece that is provided and attached to the side plate 12 in the embodiment described later. It may be provided on the side cover 15 side instead of 12, and may be provided on both sides of the side cover 15 and the side plate 12.
[0018]
  The vane ring 17 attached to at least one of the side plate 12 and the side cover 15 is formed as an annular shape as shown in FIGS. 4 and 5, and one end of the vane ring 17 is connected to the side plate 12 or A part of the inner end surface of each vane 14 can be supported by the outer surface on the other end side of the vane ring 17. The ring housing groove 12 a is formed on one inner surface of the side cover 15. It is what you want to do.
[0019]
  Further, as shown in FIGS. 4 and 5, the vane ring 17 has a shape substantially similar to the cam surface 13 a of the cam ring 13 in a portion corresponding to the suction area of the cam ring 13, and is provided in other discharge areas. The corresponding portion is shaped to be recessed toward the shaft 18 from the similar line 17a to the cam surface 13a.
[0020]
  The vane ring 17 partially intersects the back pressure introduction groove 12b for sending the pressure fluid to the inner end face side of each vane 14, but the rotor 16 rotates so that the inside of each vane 14 Since the pressure fluid is always provided to the end face from the back pressure introduction groove 12b from somewhere, there is no problem. Further, if the rotor 16 is in a stable rotating state, the inner end surface of each vane 14 (the surface toward the center of the rotor 16) will not be in sliding contact with the vane ring 17. There is almost no friction.
[0021]
  Rather, the presence of the vane ring 17 provides the following important function during the rotation of the vane pump 10. This function is shown in FIGS. 4 and 5. The description is divided into “suction area” and “discharge area” as follows.
[0022]
  (In the suction area)
  As shown in FIGS. 1 and 3, the vane ring 17 of the vane pump 10 is first housed and assembled in the ring housing groove 12 a of the side plate 12, and therefore is not rotated by the rotation of the rotor 16. Instead, the portion in the suction region of the vane ring 17 is formed so as to be substantially similar to the cam surface 13a of the cam ring 13, so that the center of each vane 14 is formed as shown in FIGS. A part of the vane 14 is supported outside the side end. Of course, during the rotation of the vane pump 10, each vane 14 protrudes toward the cam surface 13a of the cam ring 13 by centrifugal force.
[0023]
  For this reason, each vane 14 in the suction region is supported by the vane ring 17 when the vane pump 10 is stopped or started. When the rotor 16 is rotated, the centrifugal force and the back pressure introduction groove 12b are removed. All the vanes 14 immediately come into contact with the cam surface 13a of the cam ring 13 by the pressure oil. Of course, even if the fluid to be pumped by the vane pump 10 is in a low-temperature atmosphere and has a high viscosity, the vane ring 17 originally protrudes from each vane storage groove 16a, and all the vanes 14 are cam rings. Since it is in the state close to the 13 cam surfaces 13a, the pumping action is reliably exhibited.
[0024]
  Further, even when the vane pump 10 is at a position higher than the liquid level of the fluid tank, or when the stop time is long and the fluid in the vane pump 10 and the piping is reduced, the suction area of the vane ring 17 is reduced. Each vane 14 supported by a certain part immediately comes into contact with the cam surface 13a of the cam ring 13 as the rotor 16 rotates, so that even when starting, the vane 14 functions as a pump without being unstable at all. This can be said similarly when the rotor 16 is rotated at a very low rotational speed and the pressure of the fluid fed to the inner end face of each vane 14 through the back pressure port 12b is small.
[0025]
  Furthermore, since each vane 14 will leave | separate from the vane ring 17 immediately if the rotor 16 rotates, the time which these slide on the vane ring 17 is very short. For this reason, it is not necessary to make this vane ring 17 a high-hardness material, or to perform plating or the like for improving wear resistance, and the vane ring 17 itself can be manufactured at low cost, and the side plate 12 or Since it suffices to be assembled to at least one of the side covers 15, the cost of the vane pump 10 is not increased.
[0026]
  When it is desired to adjust the discharge amount of the vane pump 10, the thickness of the rotor 16 and the cam ring 13 shown in FIG. 1 is changed. However, the width of the vane ring 17 is not changed at all. It's okay. This is because the vane ring 17 only needs to be able to partially lock each vane 14.
[0027]
  In the vane pump 10, when a drive source such as an engine that rotationally drives the shaft 18 stops, the shaft 18, and thus the rotor 16, may slightly rotate in the reverse direction. Even in such a case, each of the vanes 14 in the “suction area” does not generate a large friction with the vane ring 17. This is because the vane ring 17 in this region is substantially similar to the cam surface 13a of the cam ring 13, so that each vane 14 is gently moved from a high mountain to a low mountain as shown in FIG. It is because it will be in the state of getting off.
[0028]
  (In discharge area)
  First, during the rotation of the vane pump 10, the jumping phenomenon described above occurs in each vane 14. In other words, each vane 14 is not only applied with a pushing back force toward the shaft 18 by the cam surface 13a of the cam ring 13 but also with a discharge pressure in the discharge stroke, and these two forces cause each vane 14 to move to the vane ring 17. Will be pushed slightly to the side. Then, assuming that the outer shape of the vane ring 17 in this discharge region matches the similar shape line 17 a shown by the two-dot chain line in FIG. 5, each vane 14 exerts a large friction with the vane ring 17. Will occur.
[0029]
  However, in the vane pump 10 of the present invention, the portion corresponding to the discharge region of the vane ring 17 has a shape recessed toward the shaft 18 from the similar line 17a to the cam surface 13a. Even if each vane 14 is pushed to the vane ring 17 side, the vane ring 17 has a shape that is recessed to the shaft 18 side more than the pushed amount. 17 is not touched. For this reason, each vane 14 does not generate large friction with the vane ring 17.
[0030]
  Further, for example, when the rotor 16 rotates in reverse, such as when the vane pump 10 is stopped, the distance between each vane 14 and the vane ring 17 in the discharge stroke is large. No large friction is generated between the two members.
[0031]
  Accordingly, the vane pump 10 of this claim 1.First, thisThe vane ring 17 incorporated in the cam ring 13 is substantially similar to the cam surface 13a of the cam ring 13 for the portion corresponding to the suction region of the cam ring 13, and the cam surface for the portion corresponding to the other discharge region. Since the shape is recessed toward the shaft 18 side from the similar line 17a to 13a, the vane 14 and the vane ring 17 are also disposed in the discharge stroke during the rotation operation in which each vane 14 is pushed to the vane ring 17. No large friction is generated between the vane 14 and the vane 14 and the vane ring 17 so that the vane 14 and the vane ring 17 are not worn or damaged. In the vane pump 10, since each vane 14 is always maintained in a state of protruding from the vane storage groove 16 a of the rotor 16, the annular vane ring 17 is simply attached to at least one of the side plate 12 and the side cover 15. Even if the fluid tank is arranged at any position by simply assembling, and even at a low temperature when the viscosity of the fluid is increased, wear or breakage does not occur.
[0032]
  Now, the vane pump 10 according to claim 1 is:
  “A portion of the annular vane ring 17 on the side of the discharge region adjacent to the portion after completion of the suction stroke of the suction region is a substantially linear portion 17 b, and the linear portion 17 b is directed toward the suction region of the vane ring 17. It was made to continue smoothly. "
Was also a feature.
[0033]
  That is, thisNoIn the vane pump 10, in principle, the vane ring 17 serving as the discharge region is shaped to be recessed toward the shaft 18 from the similar line 17a to the cam surface 13a. A portion on the discharge region side adjacent to the portion after completion of the suction stroke is a substantially linear portion 17b, and this linear portion 17b is made to continue gently toward the suction region of the vane ring 17.
[0034]
  With the vane ring 17 thus configured, even when each vane 14 jumps in the linear portion 17b during the operation of the vane pump 10, each vane 14 does not contact the vane ring 17, Thus, no large friction is generated between the vane ring 17 and the vane ring 17.
[0035]
  On the other hand, when the rotor 16 rotates in the reverse direction, even though each vane 14 rises gently on the vane ring 17, no significant friction is generated between the vane ring 17 and the vane ring 17.
[0036]
  In addition, the substantially straight upper portion 17b is coupled to the suction areas before and after it by a gently curved surface, so that the inner peripheral surface of the vane 14 and the vane ring can be used regardless of the rotational state of the rotor 16. Even if 17 is in a contact state, there is no problem such as catching.
[0037]
  Therefore, this claimItem 1The vane pump 10 isWhile performing the functions described,Regardless of the rotation situation, its function is even more effective.
[0038]
  Also,In order to solve the above problem,In item 2The measures taken by the invention are the above claims.Item 1About vane pump 10
  “The distance L between the outer peripheral surface of the vane ring 17 and the cam surface 13a in the suction region is always slightly larger than the height h of the vane 14 with respect to the direction in which the vane 14 enters and exits.”
It is.
[0039]
  That is, this claimItem 2The vane pump 10 makes the outer shape of the vane ring 17 in the suction region substantially the same as the cam surface 13 a of the cam ring 13, and the clearance of the vane 14 to be supported by the vane ring 17 with respect to the cam ring 13 and the rotor 16 side. It is intended to ensure. That is, thisClaim 2In the vane pump 10, the distance L between the outer peripheral surface of the vane ring 17 and the cam surface 13 a that is the inner peripheral surface of the cam ring 13 in the suction region always adds a slight clearance to the vane height h. It is made to become the size.
[0040]
  thisClaim 2In the vane pump 10, the vane ring 17 is configured as described above, so that each vane 14 is allowed to enter and exit the vane storage groove 16 a so that the pump operation can be performed. Regardless of the position in the suction region, the clearance of the cam ring 13 with respect to the cam surface 13a or the vane ring 17 is always defined within a range slightly larger than the vane height h. For this reason, when the vane pump 10 is started, each vane 14 protrudes only by the clearance and abuts against the cam surface 13 a of the cam ring 13. Further, during rotation of the rotor 16, each vane 14 is in contact with the vane ring 17. The mechanical loss due to the presence of the vane ring 17 does not occur at all.
[0041]
  Specifically, a vane ring 17 in the protruding direction of the vane 14 is used as long as the overall size is about 100 mm so as to be adopted for a power steering device as in a vane pump 10 of an embodiment described later. The distance L between the outer peripheral surface and the inner peripheral surface of the cam ring 13 is always set to a dimension obtained by adding 0.4 to 0.6 mm to the vane height h, and this value is 0.4 to 0.6 mm. Is the above clearance amount.
[0042]
  So thisClaim 2The vane pump 10 of the above claimItem 1In addition to performing the same function as that of the vane pump 10, the mechanical loss due to the presence of the vane ring 17 hardly occurs.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
  Each of the inventions configured as described above will be described with reference to the vane pump 10 according to the embodiment shown in the drawings. FIG. 1 is a longitudinal sectional view of the vane pump 10 according to the present invention. The side plate 12 and the rotor 16 are accommodated in a case 11 in which various fluid paths are formed, and the outside is covered with a side cover 15. The vane pump 10 according to the present embodiment constitutes a vehicle power steering apparatus, and a shaft 18 that is rotationally driven by a vehicle engine is spline-fitted to a rotor 16 in a case 11.
[0044]
  As shown in FIGS. 3 and 4, the side plate 12 includes a plurality of back pressure ports (not shown) communicating with the high pressure chamber 19 after being discharged from the discharge process centered on the shaft hole through which the shaft 18 passes, and A communicating back pressure introduction groove 12b is formed, and a ring storage groove 12a is formed on the inner surface located around the back pressure introduction groove 12b to be fitted and assembled with a vane ring 17 described later. It is.
[0045]
  As shown in FIGS. 1 and 3, the rotor 16 is disposed outside the side plate 12. In the rotor 16, as shown in FIG. 2, the shaft hole ( A large number of vane storage grooves 16a are formed radially around the spline hole), and vanes 14 of the same size are fitted in the respective vane storage grooves 16a so as to freely enter and exit.
[0046]
  Further, as shown in FIG. 1, the outer side of the rotor 16 is covered with a side cover 15, and in this embodiment given as an example, the tip of the shaft 18 is supported by the side cover 15. . The side cover 15 is formed with a passage for discharged fluid, and this passage communicates with a passage on the case 11 side.
[0047]
    Of course, as shown in FIGS. 1 and 2, a cam ring 13 having an inner surface as a cam surface 13a is incorporated in a portion on the outer peripheral side of the rotor 16 in the case 11, and each cam surface 13a has a cam ring 13a. The outer end of the vane 14 is in sliding contact.
[0048]
  In the present embodiment, the vane ring 17 is incorporated in the ring storage groove 12a formed on the side surface of the side plate 12 on the rotor 16 side, as shown in FIGS. It is non-circular and annular.
[0049]
  Further, as shown in FIGS. 4 and 5, the vane ring 17 has a shape substantially similar to the cam surface 13 a of the cam ring 13 in a portion corresponding to the suction area of the cam ring 13, and is provided in other discharge areas. The corresponding portion is shaped to be recessed toward the shaft 18 from the similar line 17a to the cam surface 13a.
[0050]
  In particular, in the vane pump 10 of the present embodiment, as shown in FIG. 5, the portion on the discharge region side of the annular vane ring 17 adjacent to the portion after completion of the suction stroke in the suction region is a substantially linear portion. 17b, and the straight portion 17b is made to continue gently toward the portion after the suction stroke in the suction region of the vane ring 17 is completed. In other words, in the vane pump 10 of this embodiment, in principle, the vane ring 17 in the discharge region is further substantially linearly shaped so as to be recessed toward the shaft 18 from the similar line 17a to the cam surface 13a. In addition to the portion 17 b, the straight portion 17 b is gently continued toward the suction region of the vane ring 17.
[0051]
  Further, the distance L between the outer surface of the vane ring 17 and the cam surface 13a in the suction region with respect to the entrance / exit direction of each vane 14 mounted on the rotor 16 is the vane height in the radial direction of each vane 14 as shown in FIG. The length h is a sum of a constant value between 0.4 and 0.6 mm. This numerical value of 0.4 to 0.6 mm is an example when the vane pump 10 is used as a component of the power steering apparatus and the overall size is about 100 mm, and is not limited thereto. .
[0052]
  As described above, the distance between the outer peripheral surface of the vane ring 17 and the cam surface 13a with respect to the entrance / exit direction of the vane 14 is always slightly larger than the height h of the vane 14 with respect to the entrance / exit direction of the vane 14. The vane 14 to be supported on the vane ring 17 when the vane pump 10 is stopped always has a slight clearance (about 0.4 to 0.6 mm) with respect to the vane ring 17 and the cam ring 13. Therefore, when the vane pump 10 rotates, the vane 14 does not come into sliding contact with the vane ring 17, and the amount of protrusion of each vane 14 at the start-up is reduced as much as possible so that the hydraulic oil (fluid) can be used under all operating conditions. High responsiveness of discharge can be ensured.
[0053]
  As in the above embodiment, the vane pump 10 according to the present invention can ensure a responsiveness that does not change even under any use conditions, in particular, can ensure a high responsiveness of hydraulic oil discharge at the start, During the operation of the vane pump 10, each vane 14 does not slide on the vane ring 17, and mechanical loss can be prevented.
[0054]
  Furthermore, since the vane ring 17 itself can be realized with an inexpensive material, it can be manufactured without increasing the cost of this type of vane pump.
[0055]
【The invention's effect】
  As detailed above, billingSection 1In the invention, as exemplified in the above embodiment,
  “A rotor 16 housed in a space formed by the side plate 12 and the cam ring 13 in the case 11 and rotated via the shaft 18, a plurality of vane housing grooves 16 a formed radially on the rotor 16, In the vane pump 10 provided with the vane 14 that is inserted and removably inserted into the vane storage grooves 16a.
  One end side of an annular vane ring 17 is fitted into a ring storage groove 12a formed on at least one inner surface of either the side plate 12 or the side cover 15 covering the space, and the other end side of the vane ring 17 is fitted. A portion of the inner end face of each vane 14 can be supported on the outer face of
  The annular vane ring 17 is made to be substantially similar to the cam surface 13a of the cam ring 13 in the portion corresponding to the suction region of the cam ring 13, and the portion corresponding to the other discharge region is connected to the cam surface 13a. Make the shape recessed from the similar line 17a to the shaft 18 side,
  In addition, the portion of the annular vane ring 17 on the discharge region side near the portion after completion of the suction stroke of the suction region is set to a substantially linear portion 17b, and the linear portion 17b is directed to the suction region of the vane ring 17. Gently and continuouslything"
Thus, no significant friction is generated between each vane 14 and the vane ring 17 in each region and regardless of the rotation state. Thus, it is possible to provide the vane pump 10 in which the 17 is not worn or damaged. In this vane pump 10, no matter what the position of the fluid tank is, and even at low temperatures when the viscosity of the fluid is high, wear and damage do not occur regardless of the situation. Can be performed in a stable state, and can be excellent in durability.
[0056]
  further,Claim 2In the invention pertaining toItem 1About vane pump 10
  "The distance L between the outer peripheral surface of the vane ring 17 and the cam surface 13a is always slightly larger than the height h of the vane 14 with respect to the direction in which the vane 14 enters and exits."
Has the structural features of the above,Item 1The vane pump 10 that can exhibit the same effect as the vane pump 10, has high responsiveness of hydraulic oil discharge at start-up, and hardly generates mechanical loss due to the presence of the vane ring 17. It can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a vane pump according to the present invention.
2 is a cross-sectional view taken along line 1-1 in FIG.
FIG. 3 is a partially enlarged longitudinal sectional view of the rotor, vane ring and vane constituting the vane pump according to the present invention.
FIG. 4 is an enlarged plan view showing a positional relationship between a vane ring and a cam surface in the vane pump.
FIG. 5 is an enlarged plan view showing a simplified version of what is shown in FIG. 4;
FIG. 6 is an enlarged plan view showing a positional relationship between a vane ring and a cam surface in a conventional vane pump.
[Explanation of symbols]
10 Vane pump
11 cases
12 Side plate
12a Ring storage groove
12b Back pressure introduction groove
13 Cam ring
13a Cam surface
14 Vane
15 Side cover
16 Rotor
16a Vane storage groove
17 Vane Ring
18 shaft
19 High pressure chamber
h Vane height
L distance

Claims (2)

A rotor housed in a space formed by a side plate and a cam ring in the case and rotated via a shaft, a plurality of vane housing grooves formed radially on the rotor, and the vane housing grooves respectively. In a vane pump provided with a vane that is detachably inserted,
One end side of an annular vane ring is fitted into a ring housing groove formed on at least one inner surface of either the side plate or the side cover that covers the space, and the outer surface on the other end side of the vane ring is fitted. A portion of the inner end face of each vane can be supported;
The annular vane ring is substantially similar to the cam surface of the cam ring for the portion corresponding to the suction region of the cam ring, and the similar shape to the cam surface for the portion corresponding to the other discharge region. Make the shape recessed from the wire to the shaft side ,
In addition, a portion of the annular vane ring on the discharge region side adjacent to a portion after completion of the suction stroke of the suction region is a substantially linear portion, and the linear portion is directed toward the suction region of the vane ring. and said that you were gently is continuously Te vane pump. The distance between the vane ring outer peripheral surface and the cam surface in the suction region, the vane pump mounting serial to claim 1, characterized in that as always slightly larger than the height of the vanes relative to and out direction of the vane .

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