JP2010024945A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump capable of effectively inhibiting wear of an edge of a slit by a new structure. <P>SOLUTION: A vane 8 is separated from a side surface 7b at a near side in a rotation direction RD of a slit 7 and the vane 8 is pressed against an edge Pe at a near side in the rotation direction RD of an opening part of the slit 7 by elastically pressing and energizing the vane 8 toward a tip side in the rotation direction RD to a base body part 5 by an energizing mechanism 40b. Consequently, wear of the edge Pe or the vane 8 can be inhibited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vane pump.

As a rotary compressor having the same configuration as a conventional vane pump, one disclosed in Patent Document 1 is known. In this type of rotary compressor, the protruding end portion on the outer diameter side of the vane is dragged toward the front side in the rotational direction by sliding contact with the outer peripheral surface, and the edge on the front side in the rotational direction of the slot (slit) is locally worn. There is a case. Therefore, in the rotary compressor disclosed in Patent Document 1, a notch is provided on one or both of the inner side surfaces of the slot, and a pin that is always in contact with the vane is inserted into the notch to suppress wear on the edge. Yes.
Japanese Utility Model Publication No. 49-81215

  However, in the rotary compressor disclosed in Patent Document 1, if the pins or vanes are worn due to long-term use, the effect of suppressing wear due to the above configuration may be impaired, and the vanes may be damaged. There was also.

  Then, an object of this invention is to obtain the vane pump which can suppress the abrasion of the edge of a slit more effectively with a novel structure.

  In the invention of claim 1, a plurality of slits that extend radially with respect to the rotation axis of the rotating portion and that open radially outward are formed in the base portion of the rotating portion that rotates within the casing, The vane is housed in a retractable manner, an annular chamber formed around the base portion in the casing is partitioned by the plurality of vanes to form a plurality of pump chambers, and the rotating chamber is rotated to rotate the pump chamber. In the vane pump configured to periodically increase or decrease the volume of the fluid and to discharge the fluid sucked into the pump chamber, the urging force that elastically presses and biases the vane toward the front side in the rotation direction on the base portion. A mechanism is provided.

  The invention according to claim 2 is characterized in that the biasing mechanism presses and biases a radially outer side from the center of gravity of the vane.

  The invention according to claim 3 is characterized in that the base portion is provided with a second urging mechanism that elastically presses the inner side of the center of gravity of the vane toward the front side in the rotational direction. .

  In the invention of claim 4, a plurality of slits that extend radially with respect to the rotation axis of the rotating portion and open radially outward are formed in the base portion of the rotating portion that rotates in the casing, The vane is housed in a retractable manner, an annular chamber formed around the base portion in the casing is partitioned by the plurality of vanes to form a plurality of pump chambers, and the rotating chamber is rotated to rotate the pump chamber. In the vane pump configured to periodically increase or decrease the volume of the fluid and to discharge the fluid sucked into the pump chamber, the base portion is elastically directed radially inward from the center of gravity of the vane toward the front side in the rotation direction. A second urging mechanism for pressing is provided.

  According to the first aspect of the present invention, the vane is elastically pressed and biased toward the rotation direction front side with respect to the base portion by the biasing mechanism, so that the vane is in front of the slit opening in the rotation direction. It is possible to suppress the edge or vane from being worn by being pressed against the edge. In addition, since the biasing mechanism elastically presses and biases the vane, even if wear occurs on the vane or a member that presses against the vane, the biasing force that acts on the vane as long as the elastic force can be maintained. Is maintained, and the effect of suppressing the wear can be obtained over a relatively long period of time.

  According to the invention of claim 2, the biasing mechanism can dispose the vane in a posture rotated (tilted) in the direction away from the edge around the center of gravity in the slit, and the effect of suppressing wear is further improved. You can definitely get it.

  According to the invention of claim 3, by the second urging mechanism, the vane can be arranged in a posture rotated (tilted) in the direction away from the edge around the center of gravity in the slit, and wear suppression is achieved. The effect can be obtained more reliably.

  According to the invention of claim 4, the vane is rotated (tilted) by the second urging mechanism in a direction away from the front edge of the opening of the slit around the center of gravity in the slit. It can arrange | position and it can suppress that a vane is pressed on the said edge and the edge or vane wears. In addition, since the second urging mechanism elastically presses and biases the vane, even if wear occurs on the vane or a member that presses the vane in contact with the vane, the vane is applied to the vane as long as the elastic force can be maintained. The acting urging force is maintained, and the effect of suppressing wear can be obtained over a relatively long period.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiment and the plurality of modifications include similar components. Therefore, below, about the same component, the overlapping description is abbreviate | omitted and suppose that a common code | symbol is provided.

  (First Embodiment) FIG. 1 is a cross-sectional view of a vane pump according to a first embodiment of the present invention in a cross-section orthogonal to the rotation axis, FIG. 2 is a cross-sectional view of the vane pump including a rotation axis, FIG. FIG. 4 is an exploded perspective view of the vane pump, FIG. 4 is an enlarged view of a part of FIG. 2, and FIG. 5 is an enlarged view of a part of FIG. In the following, for the sake of convenience, the upper side of FIGS. 2, 3, and 4 is defined as one axial side of the rotation axis Ax, and the lower side is defined as the other axial direction side.

  First, with reference to FIG. 1, the structure regarding the suction | inhalation and discharge of the working fluid of the vane pump 1 is demonstrated.

  In the vane pump 1 according to the present embodiment, as shown in FIG. 1, in the casing 2, a substantially circular shape of the rotating portion 4 that rotates around the substantially cylindrical inner peripheral surface 3 a of the annular ring 3 and the rotation axis Ax. An annular chamber 6 for storing a working fluid (liquid) is formed between the outer peripheral surface 5 a of the columnar base portion 5. The width w of the annular chamber 6 changes along the circumferential direction of the rotation axis Ax. In the present embodiment, the center C of the inner peripheral surface 3a and the rotation axis Ax are shifted in parallel so that the inner peripheral surface 3a of the ring 3 and the base portion 5 of the rotating portion 4 are eccentric. For this reason, the width w of the annular chamber 6 is minimum at the right end position in FIG. 1, gradually increases in the clockwise direction from the right end position, and becomes maximum at the left end position, from the left end position to the right end position. It gradually becomes narrower gradually in the clockwise direction.

  A plurality of (four in the present embodiment) slits 7 are formed in the base portion 5 so as to extend radially outward with respect to the rotation axis Ax of the rotating portion 4 and open in the radially outward direction. A rectangular bar-like or substantially strip-like vane 8 is accommodated so as to protrude and retract. The vane 8 is urged radially outward in the slit 7 by the centrifugal force generated with the rotation of the rotating portion 4 and the pressurization of the working fluid introduced to the rotation axis Ax side in the slit 7. For this reason, the vane 8 rotates together with the rotating portion 4 while being in sliding contact with the inner peripheral surface 3a.

  The annular chamber 6 is divided into the same number (four in this embodiment) of pump chambers 9 by a plurality of vanes 8 arranged at a constant pitch in the circumferential direction. With the rotation of the rotating unit 4 and the vane 8, the volume of the pump chamber 9 changes according to the change in the width w of the annular chamber 6. That is, the volume of each pump chamber 9 is minimum at the right end position in FIG. And it increases gradually with the rotation to the rotation direction RD (clockwise direction of FIG. 1) of the rotation part 4, and becomes the maximum in the position of a left end. When the rotating unit 4 further rotates in the clockwise direction from that position, the volume of the pump chamber 9 gradually decreases and becomes the minimum at the right end position. That is, in this embodiment, the volume of the pump chamber 9 is expanded in the lower half section of FIG. 1 in one rotation of the rotating unit 4, and the volume of the pump chamber 9 is decreased in the upper half section. Therefore, the suction opening 11 is provided on the inner peripheral surface 3a of the ring 3 and the casing 2 (first casing 10) so as to face the section in which the volume of the pump chamber 9 increases, and the volume of the pump chamber 9 is reduced. A discharge opening 12 is provided facing the section. The suction opening 11 communicates with the suction passage 14 in the suction pipe 13 projecting on the side surface of the first casing 10, and the discharge opening 12 is in the discharge pipe 15 projecting in parallel with the suction pipe 13. It communicates with the discharge passage 16.

  Therefore, in FIG. 1, when the rotating unit 4 rotates in the rotation direction RD, the pump chamber 9 partitioned by the two adjacent vanes 8 moves from the right end position to the left end position while increasing the volume. Therefore, the working fluid flows into the pump chamber 9 from the suction passage 14 via the suction opening 11. The pump chamber 9 moves from the left end position to the right end position while reducing the volume. For this reason, the working fluid flows out from the pump chamber 9 to the discharge passage 16 through the discharge opening 12. Such inflow and outflow of the working fluid are sequentially performed with respect to the plurality of pump chambers 9, and thus continuous suction and discharge of the working fluid by the vane pump 1 is realized.

  Next, with reference to FIGS. 1-5, the structure of each part of the vane pump 1 concerning this embodiment is demonstrated in detail.

  As shown in FIG. 2, the slit 7 formed in the base portion 5 of the rotating portion 4 is closed by the bottom wall portion 17 on the other side in the axial direction, and the vane 8 slides on the bottom wall portion 17. It reciprocates in the slit 7 in contact. That is, in the present embodiment, the bottom wall portion 17 corresponds to a guide wall portion that guides the vane 8 in the radial direction on the other side in the axial direction. The bottom wall portion 17 is formed with a communication hole 17a communicating with the inner diameter of the slit 7, and the back side (the other side in the axial direction) of the bottom wall portion 17 is formed in the slit 7 through the communication hole 17a. From the above, a pressurized pressure of the working fluid is introduced.

  The bottom wall portion 17 is formed in a disc shape centering on the rotation axis Ax and orthogonal to the rotation axis Ax, and projects in a flange shape from the outer peripheral surface 5a of the base portion 5 to the outside. A substantially cylindrical skirt portion 18 projects from the outer peripheral edge of the bottom wall portion 17. The skirt portion 18 is concentric with the rotation axis Ax and protrudes with a substantially constant thickness toward the side away from the base portion 5 (the other side in the axial direction).

  The skirt portion 18 functions as a rotor (rotor) of the motor 19 that drives the rotating portion 4, and corresponds to the teeth 20 a of the stator core 20 around which the coil is wound. It includes a magnetized portion 18a having poles alternately magnetized. At least a portion of the skirt portion 18 that functions as the magnetized portion 18a is made of a magnetic material. In this case, only the portion of the skirt portion 18 facing the teeth 20a may be made of a magnetic material (for example, a hard magnetic material such as a ferrite magnet or a samarium cobalt magnet), or the entire skirt portion 18 may be made of a magnetic material. Alternatively, the entire rotating unit 4 may be made of a magnetic material. In this case, the rotating part 4 and the skirt part 18 can be formed by mixing a resin material with a powdery or granular magnetic filler made of a magnetic material.

  As shown in FIGS. 1 and 3, the outer peripheral surface 5a of the base portion 5 is recessed in the radially inward direction at a constant pitch, whereby a blade portion 5b is formed. The blade portion 5b rotates together with the base portion 5 (rotating portion 4), improves the suction performance of the working fluid into the pump chamber 9 when facing the suction opening 11, and from the pump chamber 9 when facing the discharge opening 12. The discharge performance of the working fluid is improved.

  As shown in FIG. 2, a bearing portion 22 that rotatably supports the shaft 21 is fixed to the central portion of the base body portion 5 (rotating portion 4). The bearing portion 22 may be a sliding bearing such as a metal bush, or may be a rolling bearing such as a needle bearing.

  The rotating unit 4 is configured to rotate about the rotation axis Ax in an internal space 2a (see FIG. 2) formed by the casing 2. In the present embodiment, the casing 2 includes a first casing 10 located on one axial side (the upper side in FIGS. 2 and 3) and a first casing 10 located on the other axial side (the lower side in FIGS. 2 and 3). 2 and a ring 3 forming the outer peripheral surface of the annular chamber 6 (the inner peripheral surface 3a of the ring 3).

  As shown in FIG. 3, the ring 3 includes a cylindrical portion 3 b that forms the outer peripheral surface of the annular chamber 6, and a flange portion 3 c that projects from the other axial side of the cylindrical portion 3 b in the radially outward direction of the rotation axis Ax. And a rib 3d that forms part of the side walls of the suction passage 14 and the discharge passage 16. The cylindrical portion 3b and the rib 3d are erected at substantially the same height in the axial direction of the rotation axis Ax from the disc-shaped annular flange portion 3c.

  As shown in FIG. 2, the ring 3 is accommodated in a recess 10 b formed in the first casing 10. That is, the concave portion 10b is formed in a shape that fits the cylindrical portion 3b of the ring 3 and the rib 3d. Further, the outer peripheral portion 3e of the flange portion 3c of the ring 3 is in contact with the annular wall portion 23a of the second casing 23 on the opposite side of the concave portion 10b, and this portion is in contact with the first casing 10 and the second casing 23. The ring 3 is fixed in the axial direction of the rotation axis Ax.

  The second casing 23 includes a substantially annular recess 23b that accommodates the skirt portion 18 of the rotating portion 4, and the second casing 23 side (the other side in the axial direction, FIG. A recess 23c is formed to accommodate a portion projecting to the lower side of FIG.

  A region outside the annular wall portion 23a on the outer periphery of the concave portion 23b is a contact surface with the first casing 10. A groove portion 23d for the O-ring 34 is formed in a substantially annular shape on the abutting surface, and the O-ring 34 mounted in the groove portion 23d is used at the boundary portion between the first casing 10 and the second casing 23. The seal is secured. In addition, a seal member (for example, a gasket, an O-ring, or the like) is appropriately interposed also in a boundary portion (for example, a boundary surface between the flange portion 3c of the ring 3 and the first casing 10) between the members other than the boundary portion. The sealing performance of each boundary portion may be improved.

  A shaft 21 is installed between the bottom wall 23e of the recess 23c and the protrusion 10c of the first casing 10, and the center of the shaft 21 is a rotation axis Ax. The shaft 21 passes through a bearing portion 22 provided at the center of the rotating portion 4 and is rotatably supported by the bearing portion 22.

  In addition, as shown in FIG. 2, a protrusion is provided between the recess 23 b and the recess 23 c from the opposite side of the rotating part 4 (the other side in the axial direction, the lower side in FIG. 2) toward the rotating part 4. An annular protrusion 23f is formed, and the stator core 20 constituting the motor 19 is accommodated in an annular recess 23j on the back side of the protrusion 23f.

  The stator core 20 is attached to the center of the surface 24a of the substrate 24, as shown in FIGS. 2 and 3, and extends radially from the cylindrical portion 20b concentrically with the rotational axis Ax and the cylindrical portion 20b. And a plurality of teeth 20a around which a coil is wound.

  Various electronic components (not shown) are mounted on the back surface 24b opposite to the front surface 24a of the substrate 24 on which the stator core 20 is provided (the other side in the axial direction, the lower side in FIG. 2). Drive circuits and other circuits are formed. In the present embodiment, the energization state of the coil wound around each tooth 20a is appropriately switched by the drive circuit formed on the substrate 24 to switch the polarity in the outer peripheral portion of the tooth 20a, and thereby the diameter relative to the tooth 20a. A circumferential thrust is applied to the magnetized portion 18a (skirt portion 18) opposed to the outer direction, so that the rotating portion 4 is rotated. Therefore, in the second casing 23, at least the partition wall portion 23 g interposed between the outer peripheral portion of the stator core 20 (the teeth 20 a) and the skirt portion 18 needs to have magnetic permeability. For this reason, the whole partition part 23g or the 2nd casing 23 is formed with the material (for example, stainless steel, resin material, etc.) which has magnetic permeability.

  The substrate 24 is attached so as to block the concave portion 23c from the opposite side (the other axial side) of the rotating unit 4, and further, the substrate 24 is attached to the opposite side of the rotating unit 4 by the substrate cover 25 (the other axial direction). It is covered from the side). The board cover 25 is provided with ridges 25 a in order to secure an interval for arranging electronic components between the board 24 and the board 24.

  Both the first casing 10 and the second casing 23 have a substantially square outer shape when viewed in the axial direction along the rotation axis Ax. And the through-holes 10a and 23k of the screw 26 which fastens these at the four corners of these casings 10 and 23 are formed. The vane pump 1 is assembled by inserting the screws 26 into the through holes 10a and 23k and the through holes 25b formed at the four corners of the substrate cover 25 and screwing the nuts 27 together.

  The material and manufacturing method of each component constituting the vane pump 1 are appropriately selected in consideration of wear resistance, corrosion resistance, swelling resistance, moldability, component accuracy, etc. in addition to the above-described magnetization and permeability. Is done.

  Further, in the present embodiment, the rotating unit 4 is provided with a fluid force generating unit 28 that generates a fluid force toward one side (upper side in FIGS. 2 and 3) of the rotating shaft Ax along with the rotation. The rotating portion 4 is pressed against the first casing 10 located on the side opposite to the side on which the bottom wall portion 17 is provided. The fluid force generator 28 is provided on the end surface 18 b on the other axial side of the skirt 18 as an inclined surface that is inclined with respect to the rotational direction RD of the rotating unit 4. The inclined surface is set to be inclined from the other side in the axial direction toward one side (from the lower side to the upper side in FIG. 3) from the front side to the front side in the rotational direction RD. For this reason, the working fluid hitting this inclined surface as the rotating unit 4 rotates causes a fluid force to act on the rotating unit 4 and pushes it up in one axial direction (the upper side in FIG. 3).

  Then, in order to slidably support the rotating portion 4 that rotates while receiving fluid force (thrust) acting toward one side in the axial direction, the first casing 10 has a thrust as shown in FIG. A support portion 29 is provided. Specifically, a projection 10c is formed by projecting a portion in which the shaft 21 is inserted and supported in the first casing 10 to the other side in the axial direction, and a washer 30 is provided on the top surface 10d of the projection 10c. Thus, the bottom surface 4b of the recess 4a formed at the center of the rotating part 4 (base part 5) is abutted. In the present embodiment, the washer 30 is interposed in the thrust support portion 29, and the axial end surface 22a of the bearing portion 22 provided in the central portion of the rotating portion 4 (partly exposed on the bottom surface 4b of the recess 4a). It is easy to improve the wear resistance. That is, with this configuration, the wear resistance of this portion is adjusted by the specifications (material, dimensions, curing treatment, etc.) of the sliding contact portion between the washer 30 and the bearing portion 22, and the main body portion (base portion 5, The specifications of the bottom wall portion 17 etc. can be selected from the viewpoints of weight reduction, slidability of other sliding portions, corrosion resistance, and the like.

  As shown in FIG. 4, the diameter D <b> 2 of the sliding portion in the thrust support portion 29 is made smaller than the diameter D <b> 1 of the base portion 5. In the case where the fluid force generating portion 28 is provided, if no special thrust supporting portion is provided, the end surface 5c of the base portion 5 is in sliding contact with the first casing 10, and the sliding resistance may increase. There is. In this respect, in this embodiment, since the diameter D2 of the sliding portion is smaller than the diameter D1 of the base portion 5, the sliding resistance can be further reduced and the friction can be further reduced.

  As shown in FIG. 2, the gap 31 between the end surface 17b on one side in the axial direction of the bottom wall portion 17 and the end surface 3f on the other side in the axial direction of the ring 3 is set narrow, and the space between these end surfaces 17b and 3f is set. The leak flow rate from the gap is reduced as much as possible. A washer 30 is also interposed on the other axial side of the bearing portion 22.

  In the present embodiment, as shown in FIG. 5, the biasing mechanism 40 b that elastically presses and biases the vane 8 toward the front side in the rotational direction RD and the center of gravity G of the vane 8. An urging mechanism 40f that elastically presses the radially inner side toward the front side in the rotation direction RD is provided.

  The urging mechanism 40b is pressed against the vane 8 by a coil spring 42 as an elastic member housed in a recess 5d opened in the side surface 7b on the near side in the rotational direction RD of the slit 7 and the compression reaction force of the coil spring 42. A substantially hemispherical pressing member 41 that is biased, and the pressing member 41 presses the radially outer side of the center of gravity G of the vane 8 toward the front side in the rotational direction RD. And about this urging mechanism 40b, even if the vane 8 protrudes from the slit 7 to the outermost diameter side, the specs of each part (for example, the concave portion 5d of the base body part 5) can be pressed and urged outside the center of gravity G. It is preferable to appropriately adjust the position, the shape and size of the pressing member 41, and the like. In this configuration, the sliding resistance of the vane 8 is reduced by bringing the vane 8 into sliding contact with the substantially hemispherical portion of the pressing member 41.

  On the other hand, the urging mechanism 40f includes a coil spring 42 as an elastic member housed in a recess 5d opened in the side surface 7f on the front side in the rotational direction RD of the slit 7, and the vane 8 by the compression reaction force of the coil spring 42. A substantially hemispherical pressing member 41 that is pressed and urged to the inner side of the vane 8 by the pressing member 41, and presses the radially inner side of the center of gravity G of the vane 8 toward the front side in the rotational direction RD. And about this urging mechanism 40f, even when the vane 8 is most retracted inside the diameter of the slit 7, the specs of each part (for example, the recess 5d of the base part 5) can be urged inside the center of gravity G. It is preferable to appropriately adjust the position, the shape and size of the pressing member 41, and the like. In this urging mechanism 40f, as in the urging mechanism 40b, the vane 8 is brought into sliding contact with the substantially hemispherical portion of the pressing member 41 so as to reduce the sliding resistance of the vane 8. Yes. In the present embodiment, the urging mechanism 40f corresponds to a second urging mechanism.

  Therefore, in this embodiment, the vane 8 is elastically pressed and urged toward the front side of the rotation direction RD by the urging mechanism 40b, so that the vane 8 is rotated in the rotation direction RD of the slit 7. It is possible to prevent the edge Pe or the vane 8 from being worn due to the vane 8 being pressed against the edge Pe on the near side in the rotational direction RD of the opening of the slit 7. In addition, since the biasing mechanism 40b elastically presses and biases the vane 8, even if the vane 8 or the pressing member 41 that contacts the vane 8 is worn, the biasing mechanism 40b is applied to the vane 8 as long as the elastic force can be maintained. The acting urging force is maintained, and the effect of suppressing the wear can be obtained over a relatively long period of time.

  Furthermore, in this embodiment, the vane 8 can be disposed in a posture rotated (tilted) in the direction away from the edge Pe around the center of gravity G in the slit 7 by the biasing mechanism 40b. Therefore, the effect of suppressing wear can be obtained more reliably.

  In the present embodiment, the vane 8 can be arranged in a posture rotated (tilted) in the direction away from the edge Pe around the center of gravity G in the slit 7 by the other urging mechanism 40f. Therefore, the effect of suppressing wear can be obtained more reliably.

  In the present embodiment, the rotating part 4 is pushed up to one side in the axial direction of the rotation axis Ax by the fluid force generation part 28. With this configuration, the rotating unit 4 can be abutted against one side of the casing 2 in the axial direction (that is, the first casing 10), and the rotating unit 4 can be prevented from reciprocating in the axial direction during rotation. The reciprocating motion can suppress the occurrence of vibration and noise. Further, as shown in FIG. 4, the gap g between the end surface 5c on the one axial side of the base portion 5 and the end surface 10e on the other axial side of the first casing 10 is defined as the dimension d1 of the rotating portion 4 and the first The dimension d2 of the casing 10 can be defined more easily and more accurately, and an increase in the leakage flow rate and a decrease in the pump efficiency due to the expansion or fluctuation of the gap can be suppressed, and the vane pump can be suppressed. The variation (individual difference) of the discharge amount of 1 can be reduced.

  Furthermore, since the bottom wall portion 17 that supports the vane 8 on the other side in the axial direction so as to be slidable is provided, the movement of the vane 8 toward the other side in the axial direction can be suppressed, and the vane 8 reciprocates in the axial direction. By doing so, it is possible to suppress the occurrence of vibrations and noises, or an increase in leak flow rate and a decrease in efficiency. Such a configuration can be said to be a configuration in which the vane 8 is moved together with the rotating portion 4 to one side in the axial direction.

  (Second Embodiment) FIG. 6 is an enlarged sectional view showing a part of a cross section orthogonal to the rotation axis of the vane pump according to this embodiment.

  In the present embodiment, the configuration is basically the same as that of the first embodiment. However, this embodiment is different from the first embodiment in that urging mechanisms 40Ab and 40Af are provided instead of the urging mechanisms 40b and 40f.

  In the present embodiment, the urging mechanisms 40Ab and 40Af are each configured as a leaf spring having a substantially C-shaped cross section in which the elastic member and the pressing member are integrated, and are formed at substantially the same position as in the first embodiment. The vane 8 is housed in a shallower recess 5d and pressed and urged in the same manner as in the first embodiment. In the present embodiment, the urging mechanism 40Af corresponds to a second urging mechanism.

  Therefore, according to this embodiment, the same effects as those of the first embodiment can be obtained, and the urging mechanisms 40Ab and 40Af can be obtained with a simpler structure than the first embodiment. Therefore, the manufacturing cost can be reduced.

  As mentioned above, although embodiment and modification of this invention were described, this invention is not limited to said each embodiment and modification, A various deformation | transformation is possible. For example, the detailed configuration of the rotating part, ring, and casing of the vane pump is not limited to the above embodiment. Further, only one of the urging mechanism and the second urging mechanism may be provided in the vane pump, or the urging mechanism of the first embodiment and the urging mechanism of the second embodiment may be provided in combination. Good.

It is sectional drawing in the cross section orthogonal to the rotating shaft of the vane pump concerning 1st Embodiment of this invention. It is sectional drawing in the cross section containing the rotating shaft of the vane pump concerning 1st Embodiment of this invention. It is an exploded perspective view of the vane pump concerning a 1st embodiment of the present invention. FIG. 3 is an enlarged view of a part of FIG. 2. It is a one part enlarged view of FIG. It is a figure which expands and shows a part of cross section orthogonal to the rotating shaft of the vane pump concerning 2nd Embodiment of this invention.

Explanation of symbols

1 Vane pump 2 Casing 2a Internal space 3 Ring (casing)
DESCRIPTION OF SYMBOLS 4 Rotation part 5 Base | substrate part 6 Annular chamber 7 Slit 8 Vane 9 Pump chamber 10 1st casing (casing)
23 Second casing (casing)
40b, 40Ab biasing mechanism 40f, 40Af (second) biasing mechanism G (vane) center of gravity

Claims (4)

A plurality of slits radially extending with respect to the rotation axis of the rotating part are formed in the base part of the rotating part rotating in the casing, and vanes are accommodated in the slits so as to be able to project and retract. An annular chamber formed around the base portion is partitioned by the plurality of vanes to form a plurality of pump chambers, and the volume of the pump chamber is periodically increased or decreased by rotating the rotating portion. In the vane pump configured to discharge the fluid sucked into the pump chamber,
2. A vane pump according to claim 1, wherein a biasing mechanism that elastically presses and biases the vane toward the front side in the rotation direction is provided on the base portion.   The vane pump according to claim 1, wherein the biasing mechanism presses and biases a radially outer side from the center of gravity of the vane.   3. The vane pump according to claim 1, wherein the base portion is provided with a second urging mechanism that elastically presses the inner diameter of the vane from the center of gravity toward the front side in the rotation direction. A plurality of slits radially extending with respect to the rotation axis of the rotating part are formed in the base part of the rotating part rotating in the casing, and vanes are accommodated in the slits so as to be able to project and retract. An annular chamber formed around the base portion is partitioned by the plurality of vanes to form a plurality of pump chambers, and the volume of the pump chamber is periodically increased or decreased by rotating the rotating portion. In the vane pump configured to discharge the fluid sucked into the pump chamber,
2. A vane pump according to claim 1, wherein a second urging mechanism that elastically presses the inner diameter of the vane from the center of gravity of the vane toward the front side in the rotation direction is provided.

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