Pump mounting structure

Abstract

A housing 2 of a pump has a main part 10 and a flange 30 secured to a mount support body 102 by a bolt 40. The flange 30 has an insertion hole 31 through which the bolt 40 is inserted and a collar 41 which is formed as one with the flange 30 so as to protrude from an end face of the flange 30 and through which the bolt 40 is inserted. The mount support body 102 is formed in correspondence with the insertion hole 31 of the housing 2 and comprises a fastening hole 50 into which the bolt 40 is fastened and a fitting hole 53 into which the collar 41 is fitted.

Description

Pump mounting structure

[0001] The present invention relates to a pump mounting structure.

[0002] Japanese Patent Application Laid-Open Publication No. 2021-4604 discloses an electric pump device mounting structure including an electric pump device and a mounting surface to which the electric pump device is mounted. In this mounting structure, a positioning portion of the electric pump device fits into a positioning portion of the mounting surface of the mounting surface, thereby ensuring the mounting accuracy of the electric pump device to the mounting surface.

[0003] In JP 2021-4604 A, the positioning portion of the electric pump device is a pin portion that is fixed by press-fitting into a hole formed in the end face of the flange portion. Therefore, special processing is required for the hole into which the pin portion is press-fit, which increases the processing time. As a result, the manufacturing cost of the electric pump increases.

[0004] An object of the present invention is to improve the mounting accuracy of a pump to a mounting body at low cost.

[0005] According to one aspect of the present invention, there is provided an attachment structure for attaching a pump housing to a workpiece via a fastening member, the housing having a main body portion and a fixing portion formed on the main body portion and fixed to the workpiece by the fastening member, the fixing portion having an insertion hole through which the fastening member is inserted and a cylindrical portion protruding from an end face of the fixing portion and formed integrally with the fixing portion, and through which the fastening member is inserted, the workpiece having a fastening hole formed corresponding to the insertion hole of the housing, through which the fastening member is fastened, and a mating hole into which the cylindrical portion of the housing fits.

[0006] FIG. 1 is a side view of an electric pump and a mounting body according to an embodiment of the present invention, where the mounting body is shown in cross section; FIG. 2 is a perspective view of an electric pump according to an embodiment of the present invention; FIG. 3 is a plan view of an electric pump according to an embodiment of the present invention; FIG. 4 is a cross-sectional view of a mounting structure according to an embodiment of the present invention, where the fastening members are not fastened; FIG. 5 is a cross-sectional view of a mounting structure according to an embodiment of the present invention, where the fastening members are fastened; FIG. 6 is a side view of an electric pump and a mounting body according to a modified embodiment of the present invention, where the mounting body is shown in cross section.

[0007] Hereinafter, a mounting structure 100 for mounting an electric pump 101 to a mounting target body 102 according to an embodiment of the present invention will be described with reference to the drawings.

[0008] The electric pump 101 is mounted on, for example, a vehicle and discharges a coolant (liquid) for cooling an electric motor mounted on the vehicle or discharges oil (liquid) for lubricating gears mounted on the vehicle. The electric pump 101 may also be used as a fluid pressure supply source that discharges a working fluid (liquid) for driving equipment. The electric pump 101 may also be mounted on industrial machinery other than a vehicle.

[0009] First, the electric pump 101 and the mounting body 102 will be described with reference to Figures 1 to 3. Figure 1 is a side view of the electric pump 101 mounted on the mounting body 102, with the mounting body 102 shown in cross section. Figure 2 is a perspective view of the electric pump 101 alone. Figure 3 is a plan view of the electric pump 101 alone, as viewed from the side indicated by arrow A in Figure 1.

[0010] As shown in FIGS. 1 to 3 , the electric pump 101 has a housing 2 that houses a pump section and a motor section that are connected via a drive shaft 1 (see FIG. 3 ). The housing 2 also houses a controller that controls the operation of the motor section. In this manner, the electric pump 101 is a unit in which the pump section, the motor section, and the controller are housed within the housing 2. The drive shaft 1 is rotatably supported by the housing 2 via bearings. In this embodiment, the pump section is an internal gear pump that has an inner rotor connected to the drive shaft 1 and an outer rotor disposed outside the inner rotor. The configuration of an internal gear pump is similar to a well-known configuration, so a detailed description will be omitted. Note that the pump section is not limited to an internal gear pump, and may be a vane pump or other pump.

[0011] The housing 2 is made of resin and has a main body 10 and a protrusion 22 formed to protrude from the main body 10. In the following description, the axial direction of the drive shaft 1 will also be simply referred to as the "axial direction."

[0012] The main body 10 has a rectangular portion 11 with a rectangular outer periphery, a circular portion 12 formed integrally with the rectangular portion 11 and with a circular outer periphery, and a cover portion 20 attached to the circular portion 12 via bolts 3 as fastening members to seal the opening of the circular portion 12. A pump portion is housed in a first circular portion 12a on the distal end side of the circular portion 12, and a motor portion is housed in a second circular portion 12b on the proximal end side of the circular portion 12. A controller is housed within the rectangular portion 11. The cover portion 20 has an outer diameter identical to that of the circular portion 12 and is attached to the end face of the circular portion 12. A protrusion 22 is formed to protrude from the cover portion 20 of the main body 10. The protrusion 22 protrudes parallel to the axial direction of the drive shaft 1, and a central axis O (see FIG. 3 ) of the protrusion 22 is offset from the central axis of the drive shaft 1.

[0013] A suction port 21 (see FIG. 3) for introducing liquid into the pump section is provided on the surface of the cover section 20. A discharge port 22a (see FIG. 3) for introducing liquid discharged from the pump section to the outside is provided on the tip surface of the protrusion 22.

[0014] In the main body 10, the dimension of the rectangular portion 11 in the direction perpendicular to the drive shaft 1 is larger than the outer diameter of the circular portion 12. Therefore, the rectangular portion 11 has an end face 11a that extends radially from the outer circumferential surface of the circular portion 12. The end face 11a abuts against an end face 102a of the mounting body 102, thereby determining the axial position of the electric pump 101 relative to the mounting body 102.

[0015] A plurality of flanges 30 are formed on the outer peripheral surface of the rectangular portion 11 as fixing portions that are fixed to the attached body 102 by bolts 40 that serve as fastening members. End faces 30a of the flanges 30 and end faces 11a of the rectangular portion 11 are formed as a continuous surface. Insertion holes 31 through which the bolts 40 are inserted are formed in the flanges 30.

[0016] The mounting body 102 is a case of a device that uses the liquid discharged from the electric pump 101. The device is, for example, a transmission or a transaxle device.

[0017] 1, the mounting body 102 is formed to correspond to the insertion hole 31 of the housing 2 of the electric pump 101, and has a fastening hole 50 (see FIG. 4) into which the bolt 40 is fastened, an accommodating recess 51 that accommodates a part of the housing 2, and an insertion hole 52 formed in the bottom surface of the accommodating recess 51 and into which the protrusion 22 of the housing 2 is inserted. The fastening hole 50 and the accommodating recess 51 are formed to open on an end surface 102a of the mounting body 102. An internal thread is formed on the inner peripheral surface of the fastening hole 50, into which the external thread of the bolt 40 is threaded.

[0018] When attaching the electric pump 101 to the attachment target 102, the circular portion 12 of the housing 2 of the electric pump 101 is accommodated in the accommodation recess 51 of the attachment target 102, and the end face 11a of the rectangular portion 11 of the housing 2 is abutted against the end face 102a of the attachment target 102 while the protrusion 22 of the housing 2 is inserted into the insertion hole 52 of the attachment target 102. Then, the bolt 40 is inserted into the insertion hole 31 of the flange 30 and fastened to the fastening hole 50 of the attachment target 102, thereby pressing the end face 30a of the flange 30 and the end face 11a of the rectangular portion 11 of the housing 2 against the end face 102a of the attachment target 102, and attaching the electric pump 101 to the attachment target 102. When the electric pump 101 is attached to the attachment base 102, the space between the housing 2 and the bottom surface of the accommodation recess 51 of the attachment base 102, specifically the space between the cover portion 20 and the bottom surface of the accommodation recess 51, becomes a storage portion 4 in which liquid is stored. An intake port 21 provided on the surface of the cover portion 20 faces the storage portion 4. Furthermore, when the electric pump 101 is attached to the attachment base 102, a discharge port 22a formed on the tip surface of the protrusion 22 communicates with the insertion hole 52.

[0019] When the electric pump 101 is attached to the mounting body 102 and the motor part of the electric pump 101 is driven, the pump part of the electric pump 101 draws liquid from the storage part 4 through the suction port 21, discharges the pressurized liquid, and guides it into the insertion hole 52 of the mounting body 102 through the discharge port 22a.

[0020] A small gap exists between the outer peripheral surface of the circular portion 12 of the housing 2 and the inner peripheral surface of the accommodating recess 51. There is also a small gap between the outer peripheral surface of the protruding portion 22 of the housing 2 and the inner peripheral surface of the insertion hole 52. An O-ring 5 is provided on the outer peripheral surface of the protruding portion 22 as a sealing member. The O-ring 5 is compressed between the outer peripheral surface of the protruding portion 22 and the inner peripheral surface of the insertion hole 52, sealing the gap between the two. Therefore, liquid guided to the insertion hole 52 through the discharge port 22a of the protruding portion 22 is prevented from leaking into the accommodating recess 51 through the gap between the protruding portion 22 and the insertion hole 52, and is supplied to the equipment through the insertion hole 52. In other words, the O-ring 5 prevents communication between the discharge side and the suction side of the pump unit, thereby preventing a decrease in the performance of the pump unit. An O-ring (not shown) is also provided between the end face 11a of the rectangular portion 11 of the housing 2 and the end face 102a of the mounting body 102 as a sealing member to seal the gap between the two.

[0021] Here, when the electric pump 101 is fixed to the mounting body 102 using only the bolts 40, gaps exist between the outer peripheral surface of the circular portion 12 of the housing 2 and the inner peripheral surface of the accommodating recess 51, and between the outer peripheral surface of the protruding portion 22 of the housing 2 and the inner peripheral surface of the insertion hole 52, so there is a risk that the central axis O of the protruding portion 22 may be misaligned with the central axis of the insertion hole 52 when inserted into the insertion hole 52. In this case, the compression amount of the O-ring 5 will not be uniform in the circumferential direction, and the sealing performance of the O-ring 5 will be impaired.

[0022] Therefore, in this embodiment, in order to improve the mounting accuracy of the electric pump 101 to the mounting base 102, that is, to improve the positioning accuracy of the protrusion 22 relative to the insertion hole 52, the mounting structure 100 for mounting the electric pump 101 to the mounting base 102 includes the following configuration in addition to the bolt 40. The mounting structure 100 will be described in detail below, mainly with reference to Figures 3 to 5. Figure 4 is a cross-sectional view of the mounting structure 100, showing a state in which the bolt 40 is not fastened. Figure 5 is a cross-sectional view of the mounting structure 100, showing a state in which the bolt 40 is fastened.

[0023] 3, the flange 30 of the housing 2 is formed with a collar 41 as a cylindrical portion that protrudes from an end face of the flange 30 and through which the bolt 40 is inserted. The collar 41 is formed integrally with the flange 30.

[0024] The housing 2 and the flange 30 formed on the housing 2 are made of resin, and the collar 41 formed integrally with the flange 30 is also made of resin. In this way, the housing 2, flange 30, and collar 41 are integrally molded from resin. Therefore, the dimensional accuracy of the housing 2, flange 30, and collar 41 is improved compared to when the housing 2, flange 30, and collar 41 are made of metal and manufactured by casting, cutting, or the like. In particular, as will be described later, the collar 41 is a component that affects the mounting accuracy of the electric pump 101 to the mounting body 102, and therefore improving the dimensional accuracy of the collar 41 contributes to improving the mounting accuracy of the electric pump 101 to the mounting body 102.

[0025] The inner diameter of the collar 41 is approximately the same as the inner diameter of the insertion hole 31. Therefore, the bolt 40 can be inserted through the hollow portion of the collar 41 (see FIG. 5).

[0026] A mating hole 53 having an inner diameter larger than the inner diameter of the fastening hole 50 is formed adjacent to the fastening hole 50 formed in the mounting body 102 corresponding to the insertion hole 31. The fastening hole 50 and the mating hole 53 are formed coaxially. A collar 41 is fitted into the mating hole 53. The inner diameter of the mating hole 53 is approximately the same as the outer diameter of the collar 41. Therefore, the housing 2 is positioned relative to the mounting body 102 by the collar 41 fitted into the mating hole 53. As shown in Figures 4 and 5 , the collar 41 may be formed with a tapered portion 42 whose outer diameter decreases toward the tip of the collar 41. The tapered portion 42 makes it easier to fit the collar 41 into the mating hole 53.

[0027] When the collar 41 is fitted into the fitting hole 53 (the state shown in FIG. 4 ), a gap exists between the end face of the collar 41 and the bottom surface of the fitting hole 53. In other words, the length of the collar 41 is smaller than the depth of the fitting hole 53. Therefore, when the collar 41 is fitted into the fitting hole 53, a gap is prevented from occurring between the end face 11 a of the rectangular portion 11 of the housing 2 and the end face 102 a of the body 102 to be mounted. Therefore, when the bolt 40 is threaded into the fastening hole 50, the axial force of the bolt 40 presses the end face 30 a of the flange 30 and the end face 11 a of the rectangular portion 11 of the housing 2 against the end face 102 a of the body 102 to be mounted.

[0028] The fitting holes 53 are formed continuous with the fastening holes 50 to which the bolts 40 are attached. Therefore, the fitting holes 53 can be machined at the same time as the fastening holes 50, thereby reducing the number of machining steps. Furthermore, compared to machining the fitting holes 53 in a different location from the fastening holes 50, machining accuracy can be improved.

[0029] When attaching the electric pump 101 to the workpiece 102, the circular portion 12 of the housing 2 of the electric pump 101 is accommodated in the receiving recess 51 of the workpiece 102, and the protruding portion 22 of the housing 2 is inserted into the insertion hole 52 of the workpiece 102 while the collar 41 is fitted into the fitting hole 53 of the workpiece 102 (as shown in FIG. 4 ). Attaching the electric pump 101 to the workpiece 102 via the collar 41 improves the attachment accuracy of the electric pump 101 to the workpiece 102, thereby improving the positioning accuracy of the protruding portion 22 relative to the insertion hole 52. This aligns the central axis O of the protruding portion 22 with the central axis of the insertion hole 52, making the compression amount of the O-ring 5 uniform in the circumferential direction and improving the sealing performance of the O-ring 5. After attaching the electric pump 101 to the workpiece 102 via the collar 41, the electric pump 101 is fixed to the workpiece 102 using bolts 40.

[0030] Next, the position where the collar 41 is provided will be described with reference to FIG.

[0031] In this embodiment, flanges 30 are formed on three of the four side surfaces of the rectangular portion 11, and the electric pump 101 is fixed to the mounting body 102 by three bolts 40. That is, in this embodiment, three corresponding insertion holes 31 and fastening holes 50 are formed. Three insertion holes 31a, 31b, and 31c are shown in Figure 3.

[0032] By providing collars 41 in all three insertion holes 31a, 31b, 31c, the mounting accuracy of the electric pump 101 to the mounting base 102 is improved, but the number of steps required to process the fitting holes 53 increases accordingly. Therefore, in order to reduce the number of steps required to process the fitting holes 53, it is preferable to provide collars 41 and fitting holes 53 in some of the corresponding multiple insertion holes 31 and fastening holes 50. Two collars 41 are sufficient to determine the mounting position of the electric pump 101 to the mounting base 102, so it is preferable to provide collars 41 in at least two insertion holes 31.

[0033] However, even if the collar 41 is provided in only one insertion hole 31, the mounting accuracy of the electric pump 101 to the mounting body 102 is improved, so a configuration in which only one collar 41 is provided may be adopted.

[0034] When determining which of the multiple corresponding insertion holes 31 and fastening holes 50 to provide the collar 41 and fitting hole 53, it is preferable to select the insertion hole 31 and fastening hole 50 that are farthest from the central axis O of the protrusion 22. This is because the longer the distance between the collar 41 and the central axis O of the protrusion 22, the greater the effect of reducing vibration of the electric pump 101 relative to the attached body 102. In this embodiment, the insertion hole 31a farthest from the central axis O of the protrusion 22 and the corresponding fastening hole 50 are selected.

[0035] According to the above embodiment, the following advantageous effects are achieved.

[0036] The collar 41 is formed integrally with the flange 30. Furthermore, the fitting hole 53 into which the collar 41 fits is formed continuous with the fastening hole 50 into which the bolt 40 is fastened, so that the fitting hole 53 and the fastening hole 50 can be machined together. This allows the mounting accuracy of the electric pump 101 to the mounting target body 102 to be improved at low cost.

[0037] Furthermore, compared to machining a positioning pin and its insertion hole at a position separate from the insertion hole 31 and the fastening hole 50, the insertion hole 31 and the collar 41 are formed contiguously, and the fastening hole 50 and the fitting hole 53 are formed contiguously, thereby improving the dimensional accuracy of the collar 41 and the fitting hole 53. As a result, the mounting accuracy of the electric pump 101 to the mounting base 102 is improved.

[0038] Furthermore, when a collar 41 and a fitting hole 53 are provided in some of the multiple corresponding through holes 31 and fastening holes 50, the vibration of the electric pump 101 relative to the mounting body 102 can be reduced by appropriately selecting the through holes 31 and fastening holes 50 in which the collar 41 and the fitting hole 53 are provided.

[0039] Modifications of the above embodiment will be described below. The following modifications are also within the scope of the present invention, and it is possible to combine the following modifications with the configuration of the above embodiment, or to combine the following modifications with each other.

[0040] (1) In the above embodiment, the electric pump 101 has been described as an example of the object to be attached to the attachment base 102. However, the object to be attached to the attachment base 102 is not limited to the electric pump 101 and may simply be a pump. In this case, only the pump unit is housed within the housing 2, and the drive shaft 1 is rotatably supported by the housing 2. In other words, the motor unit and the controller are not housed within the housing 2.

[0041] (2) In the above embodiment, the electric pump 101 is fixed to the mounting base 102 by three bolts 40. However, the number of bolts 40 that fix the electric pump 101 to the mounting base 102 is not limited to three and may be one, two, four or more. When there is one bolt 40, a collar 41 and a fitting hole 53 are provided in the insertion hole 31 and the fastening hole 50 to which the bolt 40 is attached.

[0042] (3) In the above embodiment, the discharge port 22a is provided on the tip surface of the protruding portion 22 of the cover portion 20. Alternatively, the suction port 21 may be provided on the tip surface of the protruding portion 22 of the cover portion 20. In this case, the discharge port 22a is provided on the surface of the cover portion 20. In this way, the protruding portion 22 of the cover portion 20 is provided with the discharge port 22a that guides the liquid discharged from the pump portion or the suction port 21 that guides the liquid to the pump portion.

[0043] (4) In the above embodiment, the mounting base 102 has an accommodation recess 51 that accommodates a portion of the housing 2 of the electric pump 101, and an insertion hole 52 formed on the bottom surface of the accommodation recess 51 and into which the protrusion 22 of the housing 2 is inserted. However, the accommodation recess 51 is not an essential component of the present invention. In this case, as shown in FIG. 6 , the accommodation recess 51 is not formed in the end surface 102a of the mounting base 102, and the insertion hole 52 is formed in the end surface 102a of the mounting base 102. Furthermore, the suction port 21 that introduces liquid to the pump section communicates with a suction port (not shown) formed in the end surface 102a of the mounting base 102. The flange 30 is formed on the outer peripheral surface of the circular portion 12, not on the outer peripheral surface of the rectangular portion 11.

[0044] (5) In the above embodiment, the housing 2 has the main body 10 and the protruding portion 22 formed to protrude from the main body 10. However, the protruding portion 22 is not an essential component of the present invention. In this case, the suction port 21 that introduces liquid to the pump portion and the discharge port 22a that introduces liquid discharged from the pump portion to the outside are provided on the surface of the cover 20, and the suction port 21 and the discharge port 22a are respectively connected to a suction port and a discharge port formed on the end surface 102a of the mounting base 102. The collar 41 and the fitting hole 53 are used to align the suction port 21 with the suction port and the discharge port 22a with the discharge port.

[0045] (6) The cross section of the collar 41 as a cylindrical portion may not be a perfect circle, but may be an arc shape with a partially open section (for example, a C-shape).

[0046] (7) In the above embodiment, there is a small gap between the outer peripheral surface of the circular portion 12 of the housing 2 and the inner peripheral surface of the accommodating recess 51, and there is also a small gap between the outer peripheral surface of the protruding portion 22 of the housing 2 and the inner peripheral surface of the insertion hole 52, and the collar 41 and the fitting hole 53 position the housing 2 of the electric pump 101 relative to the mounting body 102. However, instead of this, the housing 2 of the electric pump 101 may be positioned relative to the mounting body 102 by the main body 10 or the protruding portion 22 of the housing 2. In this case, the collar 41 and the fitting hole 53 function as a circumferential rotation stopper for the electric pump 101 relative to the mounting body 102.

[0047] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0048] This embodiment is a mounting structure 100 for mounting a housing 2 of a pump (electric pump 101) to a mounting body 102 via fastening members (bolts 40). The housing 2 has a main body 10 and a fixing portion (flange 30) formed on the main body 10 and fixed to the mounting body 102 by the fastening members (bolts 40). The flange 30 has an insertion hole 31 through which the fastening member (bolt 40) is inserted and a cylindrical portion (collar 41) protruding from an end face of the flange 30 and formed integrally with the flange 30 and through which the bolt 40 is inserted. The mounting body 102 is formed corresponding to the insertion hole 31 of the housing 2 and includes a fastening hole 50 through which the fastening member (bolt 40) is fastened and a fitting hole 53 into which the cylindrical portion (collar 41) of the housing 2 is fitted.

[0049] In this configuration, the cylindrical portion (collar 41) is formed integrally with the fixing portion (flange 30). Furthermore, the fitting hole 53 into which the cylindrical portion (collar 41) fits is formed in the fastening hole 50 into which the fastening member (bolt 40) is fastened, so the fitting hole 53 and the fastening hole 50 can be machined together. Therefore, the mounting accuracy of the pump (electric pump 101) to the mounting body 102 can be improved at low cost.

[0050] The housing 2 is made of resin.

[0051] In this configuration, the cylindrical portion (collar 41) formed integrally with the fixing portion (flange 30) of the housing 2 is made of resin, which improves the dimensional accuracy of the cylindrical portion (collar 41). This further improves the accuracy of mounting the pump (electric pump 101) to the mounting base 102.

[0052] In addition, the housing 2 further has a protrusion 22 formed protruding from the main body 10 and having an inlet 21 for directing liquid to the pump (electric pump 101) or an outlet 22a for directing liquid discharged from the pump (electric pump 101), and the mounting body 102 further has an accommodating recess 51 for accommodating a part of the main body 10 of the housing 2 and an insertion hole 52 into which the protrusion 22 of the housing 2 is inserted, and the housing 2 is positioned relative to the mounting body 102 by the main body 10 or the protrusion 22.

[0053] In this configuration, the mounting accuracy of the pump (electric pump 101) to the mounting body 102 can be improved at low cost.

[0054] The housing 2 further has a protrusion 22 formed protruding from the main body 10 and provided with an inlet 21 for directing liquid to the pump (electric pump 101) or an outlet 22a for directing liquid discharged from the pump (electric pump 101), and a plurality of corresponding insertion holes 31 and fastening holes 50 are provided, and the collar 41 and fitting hole 53 are provided in the insertion hole 31 and fastening hole 50 farthest from the protrusion 22 among the plurality of corresponding insertion holes 31 and fastening holes 50.

[0055] In this configuration, vibration of the pump (electric pump 101) relative to the mounting body 102 can be effectively reduced.

[0056] The cylindrical portion (collar 41) also has a tapered portion 42 whose outer diameter decreases toward the tip.

[0057] In this configuration, the cylindrical portion (collar 41) can be easily fitted into the fitting hole 53, making it easy to attach the pump (electric pump 101) to the attachment target body 102.

[0058] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0059] This application claims priority based on Japanese Patent Application No. 2024-048381, filed with the Japan Patent Office on March 25, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A mounting structure for mounting a pump housing to a workpiece via a fastening member, wherein the housing has a main body portion and a fixing portion formed on the main body portion and fixed to the workpiece by the fastening member, the fixing portion having an insertion hole through which the fastening member is inserted and a cylindrical portion protruding from an end face of the fixing portion and formed integrally with the fixing portion, and through which the fastening member is inserted, and the workpiece has a fastening hole formed corresponding to the insertion hole of the housing and through which the fastening member is fastened, and a mating hole formed continuously with the fastening hole and into which the cylindrical portion of the housing is fitted.

2. A pump mounting structure according to claim 1, wherein the housing is made of resin.

3. A mounting structure for a pump as described in claim 2, wherein the housing further has a protrusion formed protruding from the main body portion and provided with a suction port for introducing liquid into the pump or a discharge port for introducing liquid discharged from the pump, the mounting body further has a accommodating recess for accommodating a part of the main body portion of the housing, and an insertion hole into which the protrusion of the housing is inserted, and the housing is positioned relative to the mounting body by the main body portion or the protrusion.

4. A mounting structure for a pump as described in claim 1, wherein the housing further has a protrusion formed protruding from the main body portion and provided with a suction port for introducing liquid into the pump or a discharge port for introducing liquid discharged from the pump, a plurality of corresponding insertion holes and fastening holes are provided, and the cylindrical portion and the fitting hole are provided in the insertion hole and fastening hole that are farthest from the protrusion among the plurality of corresponding insertion holes and fastening holes.

5. A pump mounting structure according to claim 1, wherein the cylindrical portion has a tapered portion whose outer diameter decreases toward the tip.

Images