JP6581450B2 - Vane pump - Google Patents

Description

  The present invention relates to a vane pump.

  Patent Document 1 discloses a vane pump that includes a pump unit, a body, and a cover having a recess that accommodates the pump unit, and the pump housing includes the body and the cover.

  In the vane pump disclosed in Patent Document 1, the pump unit includes a cam ring, a rotor, a vane, a first side plate that covers the cam ring and the side surface of the rotor on the body side, and a second side that covers the side surface of the cam ring and the rotor on the cover side. Alignment that passes through the side plate and the insertion hole of the cam ring and is press-fitted into the first press-fitting hole of the first side plate and the second press-fitting hole of the second side plate to align the circumferential positions of the cam ring and both side plates. And a pin. In this vane pump, the tip of the alignment pin becomes a protruding portion protruding from the first side plate, and the protruding portion is press-fitted into the press-fitting hole of the cover, so that the pump unit is positioned with respect to the cover.

JP 2002-21742 A

  In the vane pump disclosed in Patent Document 1, an alignment pin that passes through the cam ring is press-fitted into a press-fitting hole of the pump cover, and the pump unit is positioned. The press-fitting hole must be formed so as to avoid the inside of the cam ring where the rotor is disposed, and the position of the press-fitting hole is limited. As the position of the press-fitting hole is restricted in this way, the shape of the flow path of the working fluid formed in the pump cover is also restricted.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the degree of freedom in designing the flow path of the working fluid in the vane pump.

1st invention is a vane pump, Comprising: The pump cartridge accommodated in the accommodation space divided by the recessed part and pump cover of a pump body, and a pump cartridge is between the bottom part of the recessed part in a pump body, and a cam ring. A side plate provided, a first pin provided across the cam ring and the side plate, and a second pin provided across the side plate and the pump body , one end of the second pin being inserted into the side plate, The other end of the pin is inserted into the pump body .

  In the first invention, the pump cartridge integrated by the first pin is positioned with respect to the pump body by the second pin provided across the side plate and the pump body. Therefore, since it is not necessary to form the positioning hole of the pump cartridge in the pump cover, the flow path shape of the working fluid formed in the pump cover is not limited by the positioning hole.

  The second invention is characterized in that the pump cartridge includes two or more second pins.

  According to the second invention, rotation of the pump cartridge relative to the pump body can be prevented.

  In the third invention, the side plate has a discharge port for guiding the working fluid discharged from the pump chamber of the pump cartridge defined by the rotor, the cam ring, and the adjacent vane, and the pump body is connected to the pump chamber through the discharge port. And a discharge passage communicating with the high pressure chamber through the high pressure port that opens to the high pressure chamber, and the second pin has a periphery between the discharge port and the high pressure port. It is characterized by being provided at a position not penetrating a part of the high-pressure chamber between the directions.

4th invention is a vane pump , Comprising: The pump cartridge accommodated in the accommodation space divided by the recessed part and pump cover of a pump body, and a pump cartridge is between the bottom part of the recessed part in a pump body, and a cam ring. A side plate that is provided, a first pin that is provided across the cam ring and the side plate, and a second pin that is provided across the side plate and the pump body, wherein the side plate is defined by the rotor, the cam ring, and the adjacent vane. The pump body has a discharge port that guides the working fluid discharged from the pump chamber of the pump cartridge, and the pump body has an arc-shaped high-pressure chamber that guides the working fluid discharged from the pump chamber through the discharge port, and a high pressure that opens to the high-pressure chamber a discharge passage communicating with the high pressure chamber through the port, Has a ridge that separates the two ends of the pressure chamber, a second pin, in a position which does not penetrate the part of the high pressure chamber located between the circumferential direction of the discharge port and the high pressure port, across the side plate and the raised portion It is provided.

  In the third and fourth aspects of the invention, since the second pin does not penetrate a part of the high pressure chamber between the discharge port and the high pressure port, the flow of the working fluid guided from the discharge port to the high pressure port is the first. Unhindered by two pins. Therefore, the pump cartridge can be positioned without affecting the flow of the working fluid.

  ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of the flow path design of the working fluid in a vane pump improves.

It is sectional drawing of the vane pump which concerns on embodiment of this invention. It is a top view which shows the pump cartridge of the vane pump which concerns on embodiment of this invention. It is a top view which shows the bottom part in the pump body of the vane pump which concerns on embodiment of this invention. It is sectional drawing along the AA line in FIG. It is a top view which shows the 1st modification of the vane pump which concerns on embodiment of this invention. It is a top view which shows the 2nd modification of the vane pump which concerns on embodiment of this invention.

  Hereinafter, the configuration of the vane pump 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  The vane pump 100 is used as a fluid pressure supply source for a fluid pressure device mounted on a vehicle, for example, a power steering device or a continuously variable transmission. In the present embodiment, a fixed displacement vane pump 100 using hydraulic oil as a working fluid will be described. The vane pump 100 may be a variable displacement vane pump.

  As shown in FIG. 1, the vane pump 100 includes a pump body 30 having a recess 30 a, a pump cover 31 that is attached to the pump body 30 and seals the recess 30 a, and an accommodation space defined by the recess 30 a and the pump cover 31. And a pump cartridge 10 that discharges hydraulic oil.

  In the vane pump 100, the power of an engine (not shown) is transmitted to the end of the drive shaft 1, and the rotor 2 connected to the drive shaft 1 rotates. The rotor 2 rotates clockwise in FIG.

  As shown in FIGS. 1 and 2, the pump cartridge 10 includes a plurality of vanes 3 provided so as to be capable of reciprocating in the radial direction with respect to the rotor 2, and the vanes 3 that house the rotor 2 and rotate as the rotor 2 rotates. The cam ring 4 having a cam surface 4a that is an inner peripheral surface on which the tip of the cam ring 4 slides, and one side surface of the cam ring 4 disposed between the cam ring 4 and the bottom of the recess 30a of the pump body 30 (the lower side surface in FIG. 1) A first side plate 5 as a side plate that comes into contact with the second ring, and a second side plate 6 that is arranged between the cam ring 4 and the pump cover 31 and comes into contact with the other side (upper side in FIG. 1) of the cam ring 4. Prepare. FIG. 2 is a plan view showing the pump cartridge 10 with the second side plate removed.

  As shown in FIG. 2, the rotor 2 is formed with slits 7 that are opened on the outer peripheral surface in a radial pattern at predetermined intervals. The vane 3 is inserted into the slit 7 so as to be able to reciprocate. In the slit 7, a back pressure chamber 8 into which discharge pressure is guided is defined by the base end portion of the vane 3.

  The vane 3 is pressed in the direction of coming out of the slit 7 by the pressure of the hydraulic oil guided to the back pressure chamber 8, and the tip portion comes into contact with the cam surface 4 a of the cam ring 4. As a result, a plurality of pump chambers 9 are defined inside the cam ring 4 by the outer peripheral surface of the rotor 2, the cam surface 4 a of the cam ring, and the adjacent vanes 3.

  The cam ring 4 is an annular member in which the inner peripheral cam surface 4a has a substantially oval shape. The cam ring 4 includes a suction region 4 b that expands the volume of the pump chamber 9 defined by the vanes 3 that slide on the cam surface 4 a as the rotor 2 rotates, and a discharge region 4 c that contracts the volume of the pump chamber 9. And having. Thus, each pump chamber 9 expands and contracts as the rotor 2 rotates. In the present embodiment, the cam ring 4 has two suction areas 4b and two discharge areas 4c.

  As shown in FIG. 1, the first side plate 5 and the second side plate 6 are arranged with both side surfaces of the rotor 2 and the cam ring 4 sandwiched therebetween, and seal the pump chamber 9.

  As shown in FIG. 2, the arcuate two discharge ports 20 a and 20 b that open corresponding to the discharge region 4 c of the cam ring 4 are formed through the first side plate 5. The two discharge ports 20a and 20b are provided to face each other with an angular interval of 180 °.

  As shown in FIG. 3, an arc-shaped high pressure chamber 21 is formed at the bottom of the recess 30 a of the pump body 30. The hydraulic oil discharged from the pump chamber 9 in the discharge region 4 c is guided to the high pressure chamber 21 through the discharge ports 20 a and 20 b of the first side plate 5.

  The pump body 30 is formed with a discharge passage 22 that communicates with the high-pressure chamber 21 through a high-pressure port 22 a that opens to the high-pressure chamber 21 and supplies hydraulic oil in the high-pressure chamber 21 to an external hydraulic device. The high-pressure port 22a opens into the high-pressure chamber 21 at a position shifted in the circumferential direction from each of the two discharge ports 20a and 20b. In FIG. 1, the high-pressure port 22a and the discharge passage 22 are not shown.

  The high pressure chamber 21 is formed in a circular arc shape whose both ends are separated by a raised portion 35 that protrudes from the pump body 30 toward the first side plate 5 from the bottom of the high pressure chamber 21. The raised portion 35 is provided in a circumferential region R2 that is different from the circumferential region R1 in which the high-pressure port 22a is provided among the two circumferential regions R1 and R2 between the two discharge ports 20a and 20b. By providing the raised portion 35, the flow of hydraulic oil in the direction opposite to the direction (arrow direction in FIG. 3) from each discharge port 20a, 20b toward the high pressure port 22a (direction toward the raised portion 35) is hindered. It is done. For this reason, the hydraulic oil guided to the high pressure chamber 21 from the discharge ports 20a and 20b easily flows in one direction (the arrow direction in FIG. 3) directly toward the high pressure port 22a without going to the raised portion 35.

  The raised portion 35 may be in contact with the first side plate 5 or may form a communication gap 36 with the first side plate 5 as shown in FIG. That is, the raised portion 35 does not completely divide the high-pressure chamber 21 but may connect both ends of the high-pressure chamber 21 through the communication gap 36 with the first side plate 5. Even in this case, since the communication gap 36 having a cross-sectional area smaller than the cross-sectional area of the high-pressure chamber 21 provides resistance to the flow of the hydraulic oil, the hydraulic oil guided from the discharge ports 20a and 20b to the high-pressure chamber 21 is , It is difficult to flow toward the raised portion 35, and it is easy to flow directly toward the high-pressure port 22a. Thus, in this specification, “the raised portion 35 that separates both ends of the high-pressure chamber 21” is not limited to the one that completely divides the high-pressure chamber 21, and the hydraulic oil flows in one direction toward the high-pressure port 22a. It includes a device that facilitates the communication between both ends of the high-pressure chamber 21.

  Further, two arc-shaped back pressure ports 23 communicating with the high pressure chamber 21 are formed in the first side plate 5 (see FIG. 1). Each back pressure port 23 communicates with the back pressure chamber 8. As a result, the hydraulic oil in the high pressure chamber 21 is guided to the back pressure chamber 8 through the back pressure port 23.

  The second side plate 6 is formed with two arc-shaped suction ports (not shown) that open corresponding to the two suction areas 4 b (see FIG. 2) of the cam ring 4 and guide the hydraulic oil to the pump chamber 9. The Further, the pump cover 31 is formed with a suction passage (not shown) that communicates a tank (not shown) and a suction port and guides the hydraulic fluid of the tank to the pump chamber 9 through the suction port.

  As the rotor 2 rotates, the vane pump 100 sucks hydraulic oil from the tank through the suction port and the suction passage into each pump chamber 9 in the suction region 4b of the cam ring 4 and from each pump chamber 9 in the discharge region 4c of the cam ring 4. The hydraulic oil is discharged to the outside through the discharge ports 20 a and 20 b and the discharge passage 22. In this way, the vane pump 100 supplies and discharges hydraulic oil by expanding and contracting each pump chamber 9 as the rotor 2 rotates.

  The pump cartridge 10 is provided across two first pins 11 (see FIG. 1) provided across the first side plate 5, the cam ring 4, and the second side plate 6, and between the first side plate 5 and the pump body 30. And a second pin 12 (see FIG. 4).

  As shown in FIG. 1, the first pin 11 is inserted through the cam ring 4, and the upper first press-fitting hole 11 a formed in the second side plate 6 and the lower first press-fitting formed in the first side plate 5. Both ends are press-fitted into the hole 11b. Thereby, the pump cartridge 10 is integrated. The two first pins 11 are arranged symmetrically with respect to the center of the cam ring 4 (see FIG. 2). The two first pins 11 do not penetrate the first and second side plates 5 and 6, respectively. That is, both ends of the first pin 11 do not protrude from the end surfaces of the first and second side plates 5 and 6.

  As shown in FIG. 4, both ends of the second pin 12 are press-fitted into an upper second press-fitting hole 12a formed in the first side plate 5 and a lower second press-fitting hole 12b formed in the raised portion 35, respectively. . As shown in FIG. 3, the second pin 12 is provided so as not to penetrate a part of the high pressure chamber 21 between the two discharge ports 20a, 20b and the high pressure port 22a. By providing the second pin 12, the pump cartridge 10 is positioned with respect to the pump body 30.

  Here, the hydraulic fluid guided from the discharge ports 20a and 20b hardly flows toward the raised portion 35 due to the provision of the raised portion 35, and is mainly between the discharged ports 20a and 20b and the high-pressure port 22a. It flows directly toward the high-pressure port 22a through a part of the high-pressure chamber 21. For this reason, if the second pin 12 is provided through a part of the high-pressure chamber 21 between the discharge ports 20a, 20b and the high-pressure port 22a, the cross-sectional area of the flow path is reduced. The flow of discharged hydraulic oil is hindered.

  On the other hand, in the vane pump 100, as shown in FIG. 3, the second pin 12 is provided on the raised portion 35, so that the flow of hydraulic oil is not hindered by the second pin 12. Therefore, by providing the second pin 12 on the raised portion 35, the pump cartridge 10 can be positioned with respect to the pump body 30 without affecting the flow of the hydraulic oil discharged from the pump chamber 9. Further, since it is not necessary to form the positioning hole of the pump cartridge 10 in the pump cover 31, the flow path shape of the suction passage formed in the pump cover 31 is not limited by the positioning hole, and the flow path formed in the pump cover 31. Design freedom is improved. Thereby, the optimization of the layout of the suction passage and the cross-sectional area can be increased, and the suction performance can be improved, so that the vibration of the vane pump 100 and the occurrence of cavitation can be suppressed.

  When a single second pin 12 is provided, the pump cartridge 10 may rotate around the second pin 12 by the radial gap between the pump cartridge 10 and the recess 30a of the pump body 30. Conceivable. On the other hand, in the vane pump 100, since the two second pins 12 are provided, the pump cartridge 10 is more reliably prevented from rotating around the second pin 12. If there is no fear of rotation of the pump cartridge 10 around the second pin 12, a single second pin 12 may be provided. Three or more second pins 12 may be provided.

  Next, a modification of the first embodiment will be described with reference to FIGS. 5 and 6.

  In the first embodiment, the pump cartridge 10 has the second side plate 6 provided between the pump cover 31 and the cam ring 4. Alternatively, the pump cartridge 10 may not have the second side plate 6 and the pump cover 31 may be in direct contact with the cam ring 4. In this case, the first pin 11 is provided over the cam ring 4 and the first side plate 5, and both ends are press-fitted into the cam ring 4 and the first side plate 5, respectively. That is, the first pin 11 may be provided so that one end of the first pin 11 press-fitted into the cam ring 4 does not pass through the cam ring 4 and does not protrude from the cam ring 4 toward the pump cover 31.

  In the first embodiment, the high-pressure port 22a opens into the high-pressure chamber 21 at a position shifted in the circumferential direction from each of the two discharge ports 20a and 20b. Instead, as shown in FIG. 5, the high-pressure port 22a may open to the high-pressure chamber 21 at a position facing one discharge port 20a. Even in this case, the hydraulic oil guided from the other discharge port 20b passes through the high pressure chamber 21 between the discharge port 20b and the high pressure port 22a in the circumferential region R1. For this reason, even if the 2nd pin 12 is provided in the position in which the protruding part 35 in circumferential direction area | region R2 on the opposite side to circumferential direction area | region R1 is formed, the flow of hydraulic fluid is not prevented. Therefore, the same effect as the first embodiment is obtained.

  In the first embodiment, the second pin 12 is provided at a position where the raised portion 35 is formed. Instead, it may be provided at any position as long as it does not hinder the flow of hydraulic oil from the discharge ports 20a, 20b toward the high pressure port 22a. Specifically, as shown in FIG. 3, the second pin 12 may be provided at a position that does not penetrate the high-pressure chamber 21 between each of the two discharge ports 20a and 20b and the high-pressure port 22a. In other words, the second pin 12 may be provided at any position in the circumferential region R2 where the raised portion 35 opposite to the circumferential region R1 where the high-pressure port 22a is provided. Even in this case, the second pin 12 does not hinder the flow of the hydraulic oil from the discharge ports 20a, 20b to the high pressure port 22a, and therefore, the same effect as in the first embodiment is achieved.

  In the first embodiment, the vane pump is a so-called balanced vane pump 100 in which the cam ring has two discharge regions and two suction regions. Alternatively, the vane pump may be a so-called non-equilibrium type vane pump 200 in which the cam ring has one discharge region and one suction region.

  Specifically, in the vane pump 200, the first side plate is formed with a single suction port (not shown) that opens corresponding to the suction region. Moreover, the single discharge port 20c opened corresponding to a discharge area | region is formed in the 2nd side plate.

  As shown in FIG. 6, the pump body 30 is formed with an arc-shaped high-pressure chamber 121 formed at a position corresponding to the discharge port 20c.

  The second pin 12 is provided at a position where the second pin 12 avoids a part of the high-pressure chamber 121 between the discharge port 20c and the high-pressure port 22a and does not penetrate. As a result, even in the non-equilibrium vane pump, the pump cartridge 10 is positioned without hindering the flow of hydraulic oil from the discharge port 20c toward the high-pressure port 22a by the second pin 12, as in the first embodiment. can do.

  According to the above 1st Embodiment, there exists an effect shown below.

  In the vane pump 100, the pump cartridge 10 integrated by the first pin 11 is positioned with respect to the pump body 30 by the second pin 12 provided across the first side plate 5 and the pump body 30. Therefore, since it is not necessary to form the positioning hole of the pump cartridge 10 in the pump cover 31, the flow path shape of the hydraulic oil formed in the pump cover 31 is not restricted by the positioning hole. Therefore, the freedom degree of the flow path design of the hydraulic oil formed in the pump cover 31 improves.

  In addition, since the degree of freedom in designing the flow path is improved, the layout of the suction passage and the cross-sectional area can be increased, and the suction performance can be improved. Therefore, the vibration of the vane pump 100 and the occurrence of cavitation can be suppressed.

  In the vane pump 100, the second pin 12 is provided on the raised portion 35, so that the flow of hydraulic oil discharged from the pump chamber 9 is not hindered by the second pin 12. Therefore, the pump cartridge 10 can be positioned without affecting the flow of the hydraulic oil discharged from the pump chamber 9.

  Moreover, in the vane pump 100, since the two 2nd pins 12 are provided, rotation of the pump cartridge 10 with respect to the pump body 30 is also prevented.

  Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.

  The vane pumps 100 and 200 include a pump body 30 having a recess 30a, a pump cover 31 that is attached to the pump body 30 and seals the recess 30a, and a pump that is accommodated in an accommodation space defined by the recess 30a and the pump cover 31. The pump cartridge 10 includes a rotor 2 connected to a drive shaft, a plurality of slits 7 that are radially formed in the outer periphery of the rotor 2, and slides in each of the plurality of slits 7. A plurality of vanes 3 that can be inserted, a cam ring 4 having a cam surface 4 a on which the tip of the vane 3 slides as the rotor 2 rotates, and the bottom of the recess 30 a in the pump body 30 and the cam ring 4. First side plate 5 provided, first pin 1 provided across cam ring 4 and first side plate 5 Comprising the, a second pin 12 which is provided over the first side plate 5 and the pump body 30 Doo, a.

  In this configuration, the pump cartridge 10 integrated by the first pin 11 is positioned with respect to the pump body 30 by the second pin 12 provided across the first side plate 5 and the pump body 30. Therefore, since it is not necessary to form the positioning hole of the pump cartridge 10 in the pump cover 31, the flow path shape of the hydraulic oil formed in the pump cover 31 is not restricted by the positioning hole. Accordingly, the degree of freedom in designing the hydraulic oil flow path in the vane pumps 100 and 200 is improved.

  In the vane pumps 100 and 200, the pump cartridge 10 includes two or more second pins 12.

  According to this configuration, rotation of the pump cartridge 10 relative to the pump body 30 can be prevented.

  Further, the vane pumps 100 and 200 include discharge ports 20a and 20b that guide the working fluid discharged from the pump chamber 9 of the pump cartridge 10 in which the first side plate 5 is partitioned by the rotor 2, the cam ring 4, and the adjacent vane 3. 20c, and the pump body 30 has arc-shaped high pressure chambers 21 and 121 into which hydraulic oil discharged from the pump chamber 9 is guided through the discharge ports 20a, 20b and 20c, and a high pressure opening to the high pressure chambers 21 and 121. A discharge passage 22 communicating with the high-pressure chamber 21 through the port 22a, and the second pin 12 does not penetrate a part of the high-pressure chamber 21 between the discharge ports 20a and 20b and the high-pressure port 22a. Provided in position.

  In the vane pumps 100 and 200, the pump body 30 is formed with a raised portion 35 that separates both ends of the high-pressure chamber 21, and the second pin 12 is provided across the first side plate 5 and the raised portion 35.

  In these configurations, since the second pin 12 does not penetrate a part of the high-pressure chamber 21 between the discharge ports 20a, 20b, and 20c and the high-pressure port 22a, the discharge port 20a, 20b, and 20c is connected to the high-pressure port. The flow of hydraulic oil guided to 22a is not hindered by the second pin 12. Therefore, the pump cartridge 10 can be positioned without affecting the flow of hydraulic oil.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  100, 200 ... vane pump, 1 ... drive shaft, 2 ... rotor, 3 ... vane, 4 ... cam ring, 4a ... cam surface, 4b ... suction area, 4c ... discharge area, 5 ... first side plate (side plate), 9 ... Pump chamber, 10 ... Pump cartridge, 11 ... First pin, 12 ... Second pin, 20a, 20b, 20c ... Discharge port, 21, 121 ... High pressure chamber, 22 ... Discharge passage, 22a ... High pressure port, 30 ... Pump Body, 30a ... concave portion, 31 ... pump cover, 35 ... raised portion

Claims (4)

A pump body having a recess;
A pump cover attached to the pump body and sealing the recess;
A pump cartridge housed in a housing space defined by the recess and the pump cover;
The pump cartridge is
A rotor coupled to the drive shaft;
A plurality of slits formed radially in the outer periphery of the rotor;
A plurality of vanes slidably inserted into each of the plurality of slits;
A cam ring having an inner peripheral surface on which the tip of the vane slides as the rotor rotates;
A side plate provided between the bottom of the recess in the pump body and the cam ring;
A first pin provided across the cam ring and the side plate;
A second pin provided across the side plate and the pump body,
One end of the second pin is inserted into the side plate,
The vane pump, wherein the other end of the second pin is inserted into the pump body .   The vane pump according to claim 1, wherein the pump cartridge includes two or more second pins. The side plate has a discharge port that guides the working fluid discharged from the pump chamber of the pump cartridge defined by the rotor, the cam ring, and the adjacent vane,
The pump body is
An arc-shaped high-pressure chamber through which the working fluid discharged from the pump chamber is guided through the discharge port;
A discharge passage communicating with the high pressure chamber through a high pressure port that opens to the high pressure chamber,
3. The vane pump according to claim 1, wherein the second pin is provided at a position not penetrating a part of the high-pressure chamber located between the discharge port and the high-pressure port in the circumferential direction. A pump body having a recess;
A pump cover attached to the pump body and sealing the recess;
A pump cartridge housed in a housing space defined by the recess and the pump cover;
The pump cartridge is
A rotor coupled to the drive shaft;
A plurality of slits formed radially in the outer periphery of the rotor;
A plurality of vanes slidably inserted into each of the plurality of slits;
A cam ring having an inner peripheral surface on which the tip of the vane slides as the rotor rotates;
A side plate provided between the bottom of the recess in the pump body and the cam ring;
A first pin provided across the cam ring and the side plate;
A second pin provided across the side plate and the pump body,
The side plate has a discharge port that guides the working fluid discharged from the pump chamber of the pump cartridge defined by the rotor, the cam ring, and the adjacent vane,
The pump body is
An arc-shaped high-pressure chamber through which the working fluid discharged from the pump chamber is guided through the discharge port;
A discharge passage communicating with the high-pressure chamber through a high-pressure port opening in the high-pressure chamber;
A raised portion separating both ends of the high pressure chamber ,
The vane pump, wherein the second pin is provided across the side plate and the raised portion at a position not penetrating a part of the high pressure chamber between the discharge port and the high pressure port. .

Images