JP4481090B2 - Vane pump - Google Patents

Description

  The present invention relates to a vane pump that can be used even at a low speed in a vane pump that uses an intra vane (hereinafter referred to as an intra vane type vane pump).

  Conventionally, as an intra vane type vane pump, one described in Patent Document 1 (Japanese Patent Laid-Open No. 60-75784) or the like is known.

  A general intra vane type vane pump is configured such that a rotor is rotatably disposed in a cam ring having a non-circular inner contour, and a vane is inserted into a plurality of radially extending vane storage grooves formed on an outer diameter side portion of the rotor. Is slidably arranged in the rotor radial direction, and the intra vane is slidably arranged in the rotor radial direction in an intra vane storage groove formed on the inner diameter side portion of the vane. Then, suction pressure and discharge pressure are periodically introduced into the under vane chamber formed between the vane and the rotor in the vane storage groove, and formed between the vane and the intra vane in the intra vane storage groove. Discharge pressure is introduced into the intra vane chamber. If pressure is generated in the discharge pressure, the vane jumps out in the outer diameter direction in the vane storage groove and is pressed against the inner peripheral surface of the cam ring, and the intra vane is pressed against the bottom of the vane storage groove. As the rotor rotates in the cam ring and the volume partitioned by the rotor, the cam ring, and each vane changes, fluid such as hydraulic fluid introduced from the suction port is sucked between the rotor and the cam ring, and the rotor and the cam ring A pump operation is performed in which a high discharge pressure is discharged through the discharge port.

  The vane protrudes in the outer diameter direction in the vane storage groove by the centrifugal force and the discharge pressure of the intra vane chamber and is pressed against the inner peripheral surface of the cam ring, and the discharge pressure is introduced only into the intra vane chamber. Therefore, in such an intra vane type vane pump, the pressing force on the inner peripheral surface of the cam ring of the vane is reduced compared to the vane pump of the type in which there is no intra vane chamber and the discharge pressure is introduced into the under vane chamber. Thus, even when the pressure is high, the vane can smoothly slide on the inner peripheral surface of the cam ring and wear can be prevented.

  However, in such a vane pump, the centrifugal force and the discharge pressure are weakened when the rotational speed approaches zero when the rotational speed is controlled or when the rotor is moving at a low speed when the pump is started. There is a problem that the pump cannot be pressed against the peripheral surface and the pump cannot be operated. In particular, the demand for rotational speed control has increased in recent years from the viewpoint of promoting energy saving.

  In order to solve such a problem, in Japanese Patent Application Laid-Open No. 2003-301781, a spring housing groove is formed at the bottom of a vane housing groove, and a pair of coil portions connected to each other with a separation distance equal to or longer than the length of the intra vane is provided. A torsion coil spring having both arms extended outwardly, the coil part and the connecting part of the torsion coil spring are accommodated in the spring accommodating groove, and the tips of both arms are brought into contact with the vane to remove the vane. It has been proposed to bias in the radial direction.

  Further, in vane pumps other than the intra vane type, from Japanese Utility Model Laid-Open No. 2-127789, a spring receiving recess formed on the bottom of the vane storage groove or a side of the bottom of the vane storage groove is engaged with a spring. It is also known that the vane is elastically contacted with the inner peripheral surface of the cam ring by elastically contacting the spring with the vane.

JP-A-60-75784 JP 2003-301781 A Japanese Utility Model Publication No. 2-127789

  However, in the configuration of the conventional Patent Document 2 or 3, a recess for receiving a spring must be formed at the bottom of the vane housing groove of the rotor, the processing of the rotor is complicated, and the strength of the rotor is reduced. There is a problem. Further, since the strength of the rotor is reduced, it cannot be used at a high pressure.

  Moreover, since the structure of the spring shown by patent document 2 or 3 is complicated, there exists a problem that manufacturing cost starts and it is difficult to manufacture cheaply. In particular, in the intra vane type, since there is an intra vane in the central portion in the axial direction of each vane, in order to prevent interference between the intra vane and the spring, are two springs provided symmetrically with the intra vane in between? Or a spring having a complicated structure as in Patent Document 2. Therefore, the process for assembling the spring having such a complicated structure becomes complicated, and the manufacture is difficult. Furthermore, since the installation location of the spring must be secured, there is a problem that the axial thickness of the rotor cannot be reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a vane pump that can press the vane against the cam ring with a simple structure and at low cost even during low rotation.

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is characterized in that a rotor is rotatably disposed in a cam ring having a non-circular inner contour, and a diameter formed on an outer diameter side portion of the rotor. The vanes are slidably disposed in the rotor radial direction in the plurality of vane storage grooves extending in the direction, and the intra vanes are slidable in the rotor radial direction in the intra vane storage grooves formed on the inner diameter side portion of the vane. In the vane pump
An elastic body that urges the vane in the outer diameter direction is disposed in the intra vane chamber formed between the vanes in the intra vane storage groove, and the rotor communicates with the intra vane chamber and discharge pressure is increased. A passage to be introduced is provided, a partition portion is provided in a part of a boundary portion with the intra vane chamber, and the elastic body is disposed at a position facing the partition portion of the intra vane chamber. And

  The invention according to claim 2 is characterized in that an elastic body receiving portion for receiving the elastic body is provided at a portion facing at least one of the vane and the intra vane according to claim 1.

The invention described in claim 3 is characterized in that the elastic body described in claim 1 or 2 is a compression coil spring.

The invention according to claim 4 is characterized in that the elastic body according to claim 1 or 2 is a leaf spring.

A fifth aspect of the invention is characterized in that a plurality of elastic bodies according to any one of the first to fourth aspects are provided, and the plurality of elastic bodies are juxtaposed in an intra vane chamber.

According to a sixth aspect of the present invention, the elastic body is arranged at a central portion in the rotor radial direction of the elastic body according to any one of the first to fifth aspects, from at least one end portion supported by the vane or the intra vane. Is also provided with a portion having a reduced cross section.

  According to the present invention, since the elastic body is disposed in the intra vane chamber, the vane can be reliably pressed against the cam ring even at the time of low rotation. Moreover, since the necessity for processing the rotor is reduced, the strength of the rotor can be maintained. Therefore, it can be used at a high pressure. Moreover, since the necessity for processing the rotor has been reduced, it is possible to manufacture at a low cost with a high yield.

Furthermore, unlike the conventional case where an elastic body is provided in the under vane chamber, it is not necessary to use an elastic body with a complicated configuration, the configuration of the elastic body can be simplified, and the assembly is also performed easily. Can be manufactured at low cost. Moreover, since the elastic body is not affected, the axial thickness of the rotor is not affected. As a result, the axial thickness of the rotor can be reduced, and the entire vane pump can be reduced in size. . In addition, the partition portion can stably position the elastic body in the intra vane chamber and can prevent the elastic body from moving.

  According to the second aspect of the present invention, the elastic body receiving portion can stably position the elastic body in the intra vane chamber and can prevent the elastic body from moving.

According to the invention described in claim 3 , by using the compression coil spring as the elastic body, it can be manufactured at a lower cost. In addition, strength, durability, and operational stability can be ensured.

According to the fourth aspect of the invention, by using the elastic body as a leaf spring, the thickness of the elastic body can be reduced, and the vane and the intra vane can be configured to be thinner.

According to the fifth aspect of the present invention, by arranging a plurality of elastic bodies in parallel, the thickness of one elastic body can be reduced, and the vane and the intra vane can be configured to be thinner. become.

According to the invention described in claim 6, by providing the vane or at least one end portion supported by the intra vane in the central portion of the elastic body in the radial direction of the rotor, Even if the central portion of the elastic body in the radial direction of the rotor vibrates in the rotor axial direction or the circumferential direction, the elastic body can be configured to hardly interfere with the wall surface of the intra vane chamber.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view illustrating the overall configuration of a vane pump that represents an embodiment of the present invention. In the figure, a vane pump 10 is roughly disposed in a main body 12 fixed to a base or a frame, a cover 14 detachably connected to the main body 12, and the main body 12 and the cover 14. Shaft 16.

  A bearing 18 is fitted in the through hole of the main body 12 and supports the shaft 16. The end of the shaft 16 is connected to an output shaft of an electric motor (not shown).

  In an internal space formed by the main body 12 and the cover 14, the side plates 20 and 22, the cam ring 24 sandwiched between the side plates 20 and 22, the rotor 26, the vane 28, and the intra vane 30 is stored. The cam ring 24 and the side plates 20 and 22 are assembled integrally with the cover 14 by bolts (not shown), and are positioned by positioning pins 32 in the cover 14.

  As shown in FIG. 2, the cam ring 24 has an internal space with a non-circular cross-sectional outline such as an ellipse or an eccentric circle, and the rotor 26 is rotatably disposed in the internal space. The inner peripheral surface of the rotor 26 is splined with the outer peripheral surface of the shaft 16, and the rotor 26 rotates integrally with the shaft 16.

  A plurality of vane storage grooves 26 a are formed radially on the outer diameter side portion of the rotor 26. The vane storage groove 26 a extends in the radial direction and is formed over the axial length of the rotor 26. A vane 28 is slidably disposed in the radial direction of the rotor in each vane storage groove 26a. Further, an inner vane storage groove 28 a is formed on the inner diameter side portion of the vane 28. The intra vane storage groove 28 a extends in the radial direction and is formed at the center in the axial direction of the vane 28. An intra vane 30 is slidably disposed in the rotor radial direction in the intra vane storage groove 28a.

  In the vane storage groove 26 a, a space formed by the bottom and side surfaces of the vane storage groove 26 a, the inner diameter side end of the vane 28, and the side plates 20 and 22 is an under vane chamber U. In this example, the under vane chamber U communicates with a pump chamber P formed between the vane 28 and the cam ring 24 via grooves 28b and 28b formed in the radial direction in each vane 28. The same pressure as that of the pump chamber P is introduced into the chamber U. The pump chamber P communicates alternately with the suction port 40 and the discharge port 42 in the circumferential direction.

  Further, in the intra vane storage groove 28a, a space formed between the bottom and side surfaces of the intra vane storage groove 28a, the outer diameter side end portion of the intra vane 30 and the side surface of the vane storage groove 26a is an intra vane chamber I. . As shown in FIG. 3, a discharge pressure is introduced into the intra vane chamber I through a passage 26b extending in the circumferential direction inside the rotor 26 and a passage 26c extending in the rotor axial direction communicating with the passage 26b. It has come to be.

  In the intra vane chamber I, a compression coil spring 34, which is an elastic body, is provided as shown in an enlarged manner in FIGS. The compression coil spring 34 is inserted between the vane 28 and the intra vane 30, so that they are always separated from each other, that is, the vane 28 is pressed against the inner peripheral surface of the cam ring 24, and the intra vane 30 is pressed against the vane of the rotor 26. It is pressed against the bottom of the storage groove 26a.

  In order to position the compression coil spring 34, in this example, as shown in FIG. 7, the end portions of the compression coil spring 34 are supported on the end portions of the vane 28 and the intra vane 30 facing the intra vane chamber I, respectively. Spring receiving portions 28c and 30a are formed. The spring receiving portion may be formed only on at least one of the vane 28 and the intra vane 30.

  By providing the compression coil spring 34 in the intra vane chamber I in this way, the vane 28 is located on the inner peripheral surface of the cam ring 24 in the major axis position (FIG. 5) or in the minor axis position (FIG. 6). Even when the rotational speed of the rotor 26 is close to 0, the vane 28 is always pressed against the inner peripheral surface of the cam ring 24, so that the pump operation can be performed reliably.

  FIG. 8 is a partially broken perspective view corresponding to FIG. 3 showing the second embodiment. In the figure, the same members and portions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this example, a partition wall 26 d is provided at the center of the passage 26 b of the rotor 26. The partition wall 26d divides the passage 26b communicating with the intra vane chamber I into two in the axial direction. The partition wall 26d only needs to be formed at the boundary between the passage 26b and the intra vane chamber I. And the compression coil spring 34 which is an elastic body is arrange | positioned in the part of the intra vane chamber I which faces the partition wall 26d. For this reason, since the compression coil spring 34 does not directly face the passage 26b, the compression coil spring 34 can be hardly affected by the flow of the fluid in the passage 26b, and can be stably positioned so that the compression coil spring 34 does not move. it can. Therefore, in the example of FIG. 8, although the spring receiving part is formed in the vane 28 or the intra vane 30, these spring receiving parts can also be abbreviate | omitted.

  FIG. 9 shows a modification of FIG. In this example, a passage 26b communicating with the intra vane chamber I is formed in the side surface of the vane storage groove 26a of the rotor 26 in the axial direction, and the passage 26b is provided with a groove formed in the side plates 20 and 22. A discharge pressure is introduced.

  The passage 26b extending in the axial direction is separated into two in the axial direction by the partition wall 26d at the boundary portion with the intra vane chamber I in the central portion in the axial direction, and the passage 26b of the intra vane chamber I facing the partition wall 26d. A compression coil spring 34, which is an elastic body, is disposed in the portion. Even with such a configuration, the same operations and effects as in FIG. 8 can be obtained.

  10 to 12 show other embodiments, respectively.

  The example of FIG. 10 is an example in which a plurality (two in this example) of compression coil springs 34-1 as elastic bodies are arranged in parallel in the intra vane chamber I. With this configuration, a small-diameter compression coil spring 34 can be used. Therefore, the present invention can also be applied to the case where the vane 28 and the intra vane 30 are thin and the groove width of the vane storage groove 26a is thin.

  In the example of FIG. 11, the outer shape of the compression coil spring 34-2 as an elastic body is not a cylindrical shape, but a drum shape with a reduced diameter at the center as illustrated. With this configuration, it is possible to prevent the compression coil spring 34-2 from vibrating and its side surface from coming into contact with the surface constituting the intra vane chamber I. Alternatively, instead of the drum shape, it may be a bowl shape that is gradually reduced in diameter toward one end. In other words, the inner vane chamber I is configured such that the central portion has a reduced portion whose cross section is smaller than at least one end portion supported by the vane 28 or the intra vane 30 of the compression coil spring 34-2. Can be prevented from interfering with the surfaces constituting the.

  In the example of FIG. 12, a flat corrugated leaf spring 34-3 as an elastic body is provided in the intra vane chamber I. Thereby, the vane 28 and the intra vane 30 are thin, and the present invention can also be applied when the vane storage groove 26a is thin.

  According to each of the embodiments described above, the vane pump 10 can be operated at a low rotation speed, so that the vane pump 10 can be used from the start of the pump, the rotation speed can be controlled, and energy saving is promoted. be able to. Further, since there is no need to process the rotor 26 for setting the elastic body, the strength of the rotor 26 can be kept high. Therefore, it can be used at a high pressure. Further, it can be manufactured at a low cost with a good yield.

  Even if the compression coil springs 34, 34-1 and 34-2 or the leaf springs 34-3 are provided, the axial thickness of the rotor 26 is not affected. As a result, the axial thickness of the rotor 26 is not affected. It is also possible to reduce the thickness of the vane pump.

It is sectional drawing showing the whole structure of the vane pump showing embodiment of this invention. It is principal part sectional drawing seen along the 2-2 line of FIG. It is a partially broken perspective view of the vane pump of the embodiment of FIG. It is an expansion perspective view of an intra vane room. It is a partial side view showing the relationship between a vane, an intra vane, and a rotor which are in a major axis position on the cam ring inner peripheral surface. It is a partial side view showing the relationship between a vane, an intra vane, and a rotor which are in a minor axis position on the cam ring inner peripheral surface. It is a side view of (a) vane and (b) intra vane. It is a partially broken perspective view showing the 2nd Embodiment of this invention. It is a partial fracture perspective view showing the modification of a 2nd embodiment. It is a side view showing the relationship between the vane showing other embodiment of this invention, and an intra vane. It is a side view showing the relationship between the vane showing other embodiment of this invention, and an intra vane. It is a side view showing the relationship between the vane showing other embodiment of this invention, and an intra vane.

Explanation of symbols

10 vane pump 16 shaft 24 cam ring 26 rotor 26a vane storage groove 26b passage 26d partition wall (partition)
28 Vane 28a Intravan storage groove 28c Spring receiving part (elastic body receiving part)
30 Intravan 30a Spring receiving part (elastic body receiving part)
34, 34-1 and 34-2 compression coil spring (elastic body)
34-3 leaf spring (elastic body)
I Intra vane room U Under vane room

Claims (6)

A rotor is rotatably disposed in a cam ring having a non-circular inner contour, and vanes are slidably disposed in the rotor radial direction in a plurality of radially extending vane receiving grooves formed on the outer diameter side portion of the rotor. In the vane pump in which the intra vane is slidably disposed in the rotor radial direction in the intra vane storage groove formed on the inner diameter side portion of the vane,
An elastic body that urges the vane in the outer diameter direction is disposed in the intra vane chamber formed between the vanes in the intra vane storage groove, and the rotor communicates with the intra vane chamber and discharge pressure is increased. A passage to be introduced is provided, a partition portion is provided in a part of a boundary portion with the intra vane chamber, and the elastic body is disposed at a position facing the partition portion of the intra vane chamber. And vane pump.   2. The vane pump according to claim 1, wherein an elastic body receiving portion for receiving the elastic body is provided in a portion facing at least one of the vane and the intra vane. 3. The vane pump according to claim 1, wherein the elastic body is a compression coil spring. 3. The vane pump according to claim 1, wherein the elastic body is a leaf spring. Wherein providing a plurality of elastic bodies, vane pump according to any one of claims 1, characterized in that juxtaposed elastic body the plurality of intra vane chamber 4. The rotor radial direction central portion of the elastic body, any one of claims 1 and providing a cross section is reduced portion than at least one end is supported by the vane or intra vane 5 Vane pump as described in.

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