Pump mounting structure

Abstract

A housing 2 of a pump has an insertion hole 31 into which a bolt 40 is inserted, and a protruding part 22 formed so as to protrude. A body 102 to be mounted has a fastening hole 50 which is formed corresponding to the insertion hole 31 of the housing 2 and to which the bolt 40 is fastened, and an insertion hole 52 into which the protruding part 22 of the housing 2 is inserted. A mounting structure 100 includes a collar 41 which is provided to protrude from one among the insertion hole 31 and the fastening hole 50 and into which the bolt 40 is inserted, and a fitting hole 53 which is provided to the other among the insertion hole 31 and the fastening hole 50 and into which the collar 41 is fitted.

Description

Technical Field

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

Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2021 - 4604 discloses a mounting structure for an electric pump device, which includes the electric pump device and a mounting body to which the electric pump device is mounted. In this mounting structure, the positioning portion of the electric pump device is fitted with the positioning portion of the mounting surface of the mounting body, thereby ensuring the mounting accuracy of the electric pump device with respect to the mounting body.

Summary of the Invention

[0003] In Japanese Unexamined Patent Application Publication No. 2021 - 4604, 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, dedicated processing of the hole into which the pin portion is press - fitted is required, resulting in an increase in processing man - hours. As a result, the manufacturing cost of the electric pump increases.

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

[0005] According to an aspect of the present invention, there is a mounting structure for attaching a pump housing to a mounting body. The housing has an insertion hole through which a fastening member is inserted, a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and a protruding portion formed to protrude. The mounting body has a fastening hole formed corresponding to the insertion hole of the housing and fastened with the fastening member, and an insertion hole into which the protruding portion of the housing is inserted. The mounting structure includes a cylindrical portion provided to protrude from one of the insertion hole and the fastening hole and through which the fastening member is inserted, and a fitting hole provided in the other of the insertion hole and the fastening hole and into which the cylindrical portion is fitted. There are three or more corresponding through holes and fastening holes, and of these three or more corresponding through holes and fastening holes, the cylindrical portion and fitting hole are provided in the two that maximize the area of ​​the virtual triangle formed by the protruding portion and the two through holes. . Furthermore, according to one aspect of the present invention, there is a mounting structure for attaching a pump housing to a mounting body, wherein the housing has an insertion hole through which a fastening member is inserted, and a protruding portion provided with a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and the mounting body has a fastening hole formed corresponding to the insertion hole of the housing and into which a fastening member is fastened, and an insertion hole into which the protruding portion of the housing is inserted, and the mounting structure has a cylindrical portion provided protruding from one of the insertion hole and the fastening hole through which a fastening member is inserted, and a fitting hole provided on the other of the insertion hole and the fastening hole into which the cylindrical portion is fitted, and there are three or more corresponding insertion holes and fastening holes, and of the three or more corresponding insertion holes and fastening holes, the cylindrical portion and fitting hole are provided in the two that make the virtual triangle with the protruding portion and the two insertion holes as vertices closest to an equilateral triangle. Furthermore, according to one aspect of the present invention, there is a mounting structure for attaching a pump housing to a mounting body, wherein the housing has an insertion hole through which a fastening member is inserted, and a protruding portion provided with a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and the mounting body has a fastening hole formed corresponding to the insertion hole of the housing and into which the fastening member is fastened, and an insertion hole into which the protruding portion of the housing is inserted, and the mounting structure has a cylindrical portion provided protruding from one of the insertion hole and the fastening hole through which the fastening member is inserted, and a fitting hole provided on the other of the insertion hole and the fastening hole into which the cylindrical portion is fitted, and there are three or more corresponding insertion holes and fastening holes, and of the three or more corresponding insertion holes and fastening holes, the cylindrical portion and fitting hole are provided on two of them that pass through the center of the pump drive shaft and straddle an imaginary line that divides the pump into a discharge side region and a suction side region. [Brief explanation of the drawing]

[0006] [Figure 1] A side view of an electric pump and a mounting body according to an embodiment of the present invention, the mounting body is shown in cross-section. [Figure 2] This is a perspective view of an electric pump according to an embodiment of the present invention. [Figure 3] This is a plan view of an electric pump according to an embodiment of the present invention. [Figure 4] This is a cross-sectional view of a mounting structure according to an embodiment of the present invention, showing a state in which the fastening member is not fastened. [Figure 5] This is a cross-sectional view of a mounting structure according to an embodiment of the present invention, showing the state in which the fastening members are fastened. [Figure 6] This is a plan view of an electric pump according to an embodiment of the present invention, and the arrangement of the insertion holes differs from the embodiment shown in Figure 3. [Figure 7] A modified example of the present invention is shown, comprising an electric pump and a mounting body, with the mounting body shown in cross-section. [Modes for carrying out the invention]

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

[0008] The electric pump 101 is, for example, mounted on a vehicle and used to discharge coolant (liquid) to cool an electric motor mounted on the vehicle, or to discharge oil (liquid) to lubricate gears mounted on the vehicle. The electric pump 101 may also be used as a fluid pressure supply source to discharge working fluid (liquid) to drive equipment. Furthermore, the electric pump 101 may be mounted on industrial machinery other than vehicles.

[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 attached to 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, viewed from the side of arrow A in Figure 1.

[0010] As shown in Figures 1 to 3, the electric pump 101 has a housing 2 that houses a pump section and a motor section connected via a drive shaft 1 (see Figure 3). The housing 2 also houses a controller that controls the drive of the motor section. Thus, the electric pump 101 is a unit in which the pump section, motor section, and controller are housed within the housing 2. The drive shaft 1 is rotatably supported in the housing 2 via bearings. In this embodiment, the pump section is an internal gear pump having an inner rotor connected to the drive shaft 1 and an outer rotor positioned outside the inner rotor. The configuration of the internal gear pump is the same as a well-known configuration, so a detailed explanation is omitted. Note that the pump section is not limited to an internal gear pump, and may be a vane pump or other type of pump.

[0011] The housing 2 has a main body portion 10 and a protruding portion 22 that protrudes from the main body portion 10. In the following, 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 circumference, a circular portion 12 formed integrally with the rectangular portion 11 and having a circular outer circumference, and a cover portion 20 attached to the circular portion 12 via bolts 3 as fastening members and sealing the opening of the circular portion 12. The pump portion is housed in the first circular portion 12a at the tip end of the circular portion 12, and the motor portion is housed in the second circular portion 12b at the base end of the circular portion 12. The controller is housed in the rectangular portion 11. The cover portion 20 has the same outer diameter as the circular portion 12 and is attached to the end face of the circular portion 12. The protruding portion 22 is formed protruding from the cover portion 20 of the main body 10. The protruding portion 22 protrudes parallel to the axial direction of the drive shaft 1, and the central axis O of the protruding portion 22 is offset from the central axis of the drive shaft 1.

[0013] The surface of the cover portion 20 is provided with a suction port 21a (see Figure 3) for guiding liquid to the pump portion. In addition, the tip surface of the protruding portion 22 is provided with a discharge port 22a (see Figure 3) for guiding the liquid discharged from the pump portion to the outside.

[0014] In the main body 10, the dimensions of the rectangular portion 11 perpendicular to the drive shaft 1 are 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 the 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] Multiple flanges 30 are formed on the outer circumferential surface of the rectangular portion 11. The end faces 30a of the flanges 30 and the end face 11a of the rectangular portion 11 are formed as a continuous surface. Through holes 31 are formed in the flanges 30 through which bolts 40, which serve as fastening members for fixing the electric pump 101 to the mounting body 102, are inserted.

[0016] The mounting object 102 is the case of equipment that utilizes the liquid discharged from the electric pump 101. The equipment may be, for example, a transmission or a transaxle.

[0017] As shown in Figure 1, the mounting body 102 is formed corresponding to the insertion hole 31 of the housing 2 of the electric pump 101 and has a fastening hole 50 (see Figure 4) into which a bolt 40 is fastened, a housing recess 51 that accommodates a part of the housing 2, and an insertion hole 52 formed on the bottom surface of the housing recess 51 into which a protrusion 22 of the housing 2 is inserted. The fastening hole 50 and the housing recess 51 are formed as openings on the end face 102a of the mounting body 102. A female thread is formed on the inner circumferential surface of the fastening hole 50 into which the male thread of the bolt 40 is screwed.

[0018] When attaching the electric pump 101 to the mounting body 102, the circular portion 12 of the housing 2 of the electric pump 101 is placed in the receiving recess 51 of the mounting body 102, and the protruding portion 22 of the housing 2 is inserted into the insertion hole 52 of the mounting body 102 while the end face 11a of the rectangular portion 11 of the housing 2 is brought into contact with the end face 102a of the mounting body 102. Then, the bolt 40 is inserted through the insertion hole 31 of the housing 2 and fastened into the fastening hole 50 of the mounting body 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 mounting body 102, and the electric pump 101 is attached to the mounting body 102. With the electric pump 101 attached to the mounting body 102, the space between the housing 2 and the bottom surface of the housing recess 51 of the mounting body 102, specifically the space between the cover portion 20 and the bottom surface of the housing recess 51, becomes a storage portion 4 where liquid is stored. The suction port 21a provided on the surface of the cover portion 20 faces the storage portion 4.

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

[0020] There is a slight gap between the outer peripheral surface of the circular portion 12 of the housing 2 and the inner peripheral surface of the accommodation recess 51. Also, there is a slight 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 as a seal member is provided on the outer peripheral surface of the protruding portion 22, and 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 to seal between them. Therefore, the liquid guided to the insertion hole 52 through the discharge port 22a of the protruding portion 22 is prevented from leaking into the accommodation recess 51 through the gap between the protruding portion 22 and the insertion hole 52, and is supplied to the device through the insertion hole 52. That is, the O-ring 5 prevents the discharge side and the suction side of the pump section from communicating with each other, and prevents the performance of the pump section from deteriorating. An O-ring (not shown) as a seal member for sealing between them is also provided between the end surface 11a of the rectangular portion 11 of the housing 2 and the end surface 102a of the attached body 102.

[0021] Here, when the electric pump 101 is fixed to the attached body 102 only with the bolts 40, since there are gaps between the outer peripheral surface of the circular portion 12 of the housing 2 and the inner peripheral surface of the accommodation 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, there is a possibility that the protruding portion 22 may be inserted into the insertion hole 52 with the central axis O shifted from the central axis of the insertion hole 52. In that case, the amount of compression 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 the present embodiment, in order to improve the mounting accuracy of the electric pump 101 with respect to the attached body 102, that is, in order to improve the positioning accuracy of the protruding portion 22 with respect to the insertion hole 52, the mounting structure 100 for mounting the electric pump 101 to the attached body 102 includes the following configuration in addition to the bolts 40. Hereinafter, mainly referring to FIGS. 3 to 5, the mounting structure 100 will be described in detail. FIG. 4 is a cross-sectional view of the mounting structure 100 showing a state where the bolts 40 are not fastened. FIG. 5 is a cross-sectional view of the mounting structure showing a state where the bolts 40 are fastened.

[0023] A press-fit hole 32 is formed in the opening of the through-hole 31 in the flange 30 of the housing 2, with an inner diameter larger than the inner diameter of the through-hole 31. A collar 41, which is a cylindrical part, is press-fitted into the press-fit hole 32. In other words, the inner diameter of the press-fit hole 32 and the outer diameter of the collar 41 are approximately the same.

[0024] The inner diameter of the collar 41 is approximately the same as the inner diameter of the through hole 31. Therefore, the bolt 40 can be inserted through the hollow portion of the collar 41 (see Figure 5). The length (axial length) of the collar 41 is greater than the depth of the press-fit hole 32. Therefore, when the collar 41 is press-fitted into the press-fit hole 32 and its end face contacts the bottom surface of the press-fit hole 32 (as shown in Figure 4), a portion of the collar 41 protrudes from the through hole 31. In other words, a portion of the collar 41 protrudes from the end face 30a of the flange 30.

[0025] A fitting hole 53 is formed in the opening of the fastening hole 50, which is formed in the mounting body 102 corresponding to the through hole 31, and has an inner diameter larger than the inner diameter of the fastening hole 50. A part of the collar 41 (the part that protrudes from the through hole 31) fits into the fitting hole 53. The inner diameter of the fitting hole 53 is approximately the same as the inner diameter of the press-fit hole 32. Therefore, the collar 41, which is provided across the press-fit hole 32 and the fitting hole 53, positions the housing 2 relative to the mounting body 102.

[0026] When the collar 41 is fitted into the fitting hole 53 (as shown in Figure 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 less than the sum of the depth of the press-fit hole 32 and the depth of the fitting hole 53. Therefore, with the collar 41 positioned across the press-fit hole 32 and the fitting hole 53, a gap is prevented from forming between the end face 11a of the rectangular portion 11 of the housing 2 and the end face 102a of the mounting body 102. Consequently, when the bolt 40 is screwed into the fastening hole 50, the axial force of the bolt 40 presses 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 mounting body 102.

[0027] The press-fit holes 32 and fitting holes 53 are formed in the through-holes 31 and fastening holes 50, respectively, into which the bolts 40 are installed. Therefore, the machining of the press-fit holes 32 and fitting holes 53 can be performed together with the machining of the through-holes 31 and fastening holes 50, thereby reducing the number of machining steps. Furthermore, compared to machining the press-fit holes 32 and fitting holes 53 in different locations from the through-holes 31 and fastening holes 50, the machining accuracy can be improved.

[0028] When attaching the electric pump 101 to the mounting body 102, the collar 41 is first pressed into the press-fit hole 32. Then, while accommodating the circular portion 12 of the housing 2 of the electric pump 101 in the receiving recess 51 of the mounting body 102, the protruding portion 22 of the housing 2 is inserted into the insertion hole 52 of the mounting body 102, and the collar 41 is fitted into the fitting hole 53 of the mounting body 102 (as shown in Figure 4). By attaching the electric pump 101 to the mounting body 102 via the collar 41, the mounting accuracy of the electric pump 101 to the mounting body 102 is improved, and the positioning accuracy of the protruding portion 22 relative to the insertion hole 52 is improved. As a result, the central axis O of the protruding portion 22 and the central axis of the insertion hole 52 coincide, and the compression amount of the O-ring 5 becomes uniform in the circumferential direction, resulting in good sealing performance of the O-ring 5. After attaching the electric pump 101 to the mounting body 102 via the collar 41, the electric pump 101 is fixed to the mounting body 102 using bolts 40.

[0029] Next, the position where the collar 41 is provided will be described with reference to Figures 3 and 6. Figure 6 is a different configuration from the one shown in Figure 3, and the arrangement of the through-holes 31 is different from that in Figure 3.

[0030] In this embodiment, flanges 30 are formed on three of the four sides of the rectangular portion 11, and the electric pump 101 is fixed to the mounting body 102 by three bolts 40. In other words, in this embodiment, three corresponding through holes 31 and fastening holes 50 are formed. Figures 3 and 6 show the three through holes 31a, 31b, and 31c.

[0031] Providing collars 41 in all three through holes 31a, 31b, and 31c improves the mounting accuracy of the electric pump 101 to the mounting body 102, but this increases the machining time for the press-fit hole 32 and the fitting hole 53. Therefore, in order to reduce the machining time for the press-fit hole 32 and the fitting hole 53, it is preferable to provide collars 41 and fitting holes 53 in some of the multiple through holes 31 and fastening holes 50 that correspond to each other. Since two collars 41 are sufficient to define the mounting position of the electric pump 101 to the mounting body 102, it is preferable to provide collars 41 in at least two of the through holes 31.

[0032] However, even if the collar 41 is provided in only one through-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 is also acceptable.

[0033] When selecting one of several corresponding through holes 31 and fastening holes 50 to provide the collar 41 and fitting hole 53, it is preferable to select the through hole 31 and fastening hole 50 with the longest distance from the central axis O of the protruding portion 22. This is because a longer distance between the collar 41 and the central axis O of the protruding portion 22 has a greater effect in reducing vibration of the electric pump 101 relative to the mounting body 102. In Figure 3, the one provided with the collar 41 and fitting hole 53 is the through hole 31a and its corresponding fastening hole 50 with the longest distance from the central axis O of the protruding portion 22.

[0034] When determining two of the three or more corresponding through holes 31 and fastening holes 50 to be provided with the collar 41 and fitting holes 53, it is preferable to select the two that maximize the area of ​​the virtual triangle formed by the central axis O of the protrusion 22 and the centers of the two through holes 31. This is because a larger area of ​​the virtual triangle has a greater effect in reducing the vibration of the electric pump 101 to the mounted body 102. In the embodiment shown in Figure 3, as shown by the dashed line, there are three virtual triangles: virtual triangle T1 formed by the central axis O of the protrusion 22 and the centers of the two through holes 31a and 31b; virtual triangle T2 formed by the central axis O of the protrusion 22 and the centers of the two through holes 31a and 31c; and virtual triangle T3 formed by the central axis O of the protrusion 22 and the centers of the two through holes 31b and 31c. Of these, virtual triangle T1 has the largest area. Therefore, in the embodiment shown in Figure 3, the two holes for providing the collar 41 and the fitting hole 53 are selected to be the through holes 31a and 31b and the corresponding fastening holes 50. The virtual triangles T1, T2, and T3 are drawn on a plan view of the electric pump 101 as seen in the axial direction of the drive shaft 1, as shown in Figure 3.

[0035] Furthermore, when determining two of the three or more corresponding through holes 31 and fastening holes 50 to be provided with the collar 41 and fitting holes 53, it is preferable that the angle formed by the line segment connecting the central axis O of the protrusion 22 and the centers of the two through holes 31 (the angle of the vertex of the central axis O of the protrusion 22 in the virtual triangle, which is the angle α1, α2, α3 shown in Figure 6) is close to 60°. In other words, it is preferable to select two virtual triangles whose vertices are the central axis O of the protrusion 22 and the centers of the two through holes 31, and which are closest to an equilateral triangle. In the embodiment shown in Figure 6, as shown by the dashed line, there are three virtual triangles: virtual triangle T1 whose vertex is the central axis O of the protrusion 22 and the centers of the two through holes 31a, 31b; virtual triangle T2 whose vertex is the central axis O of the protrusion 22 and the centers of the two through holes 31a, 31c; and virtual triangle T3 whose vertex is the central axis O of the protrusion 22 and the centers of the two through holes 31b, 31c. The virtual triangle T2 is flattened, with the angle α2 at the vertex of the central axis O of the protrusion 22 being close to 180°, and the protrusion 22 and the two through holes 31a and 31c being arranged in a roughly straight line. In this case, the electric pump 101 is more likely to vibrate in the rotational direction around the protrusion 22 relative to the mounting body 102. The virtual triangle T3 is similarly flattened, with an angle α3 close to 180°. On the other hand, the virtual triangle T1 has an angle α1 at the vertex of the central axis O of the protrusion 22 being closest to 60°, making it the closest to an equilateral triangle. Therefore, in the embodiment shown in Figure 6, the two through holes 31a and 31b and their corresponding fastening holes 50 are selected as the two locations for the collar 41 and the fitting holes 53.

[0036] Furthermore, in this embodiment, the pump section is an internal gear pump, which sucks in liquid through the suction port 6 and discharges liquid through the discharge port 7 during one rotation. The suction port 6 is formed as an arc-shaped opening on the back surface of the cover section 20 and communicates with the suction port 21a. The discharge port 7 is formed as an arc-shaped opening on the back surface of the cover section 20 and communicates with the discharge port 22a. Thus, since the pump section, which is an internal gear pump, performs suction and discharge once each during one rotation, it is divided into a suction-side region 8 and a discharge-side region 9, with a boundary line D passing through the midpoint C of the suction port 6 and the discharge port 7 in the rotational direction of the drive shaft 1 and the center of the drive shaft 1 as the boundary. Therefore, a pressure difference is generated in the pump section across the boundary line D, and vibration is easily generated in the vertical direction of the paper in Figures 3 and 6 due to this pressure difference. Therefore, when deciding which two of the three or more corresponding through holes 31 and fastening holes 50 to provide the collar 41 and fitting holes 53, it is preferable to select the two that straddle the boundary line D. By providing the collar 41 on either side of the boundary line D, vibration of the electric pump 101 relative to the mounted object 102 can be reduced. In the embodiments shown in Figures 3 and 6, the two selected for providing the collar 41 and fitting holes 53 are the through holes 31a, 31b and their corresponding fastening holes 50, which are provided on either side of the boundary line D.

[0037] In addition, as described above, three methods were explained for determining which two of the three or more corresponding through holes 31 and fastening holes 50 will have the collar 41 and fitting holes 53: the two that maximize the area of ​​the virtual triangle formed by the central axis O of the protruding portion 22 and the centers of the two through holes 31; the two that make the virtual triangle formed by the central axis O of the protruding portion 22 and the centers of the two through holes 31 closest to an equilateral triangle; and the two that straddle the boundary line D. The two that will have the collar 41 and fitting holes 53 may be determined so as to satisfy all three of these conditions or two of the three conditions.

[0038] According to the above embodiments, the following effects and advantages are achieved.

[0039] Since a press-fit hole 32 is provided in the insertion hole 31 through which the bolt 40 is inserted, into which the collar 41 is press-fitted, and a fitting hole 53 is provided in the fastening hole 50 through which the bolt 40 is fastened, into which the collar 41 is fitted, the press-fit hole 32 and the fitting hole 53 can be machined together with the insertion hole 31 and the fastening hole 50. In other words, the insertion hole 31 and the press-fit hole 32 can be machined in the same process, and the fastening hole 50 and the fitting hole 53 can be machined in the same process. As a result, the number of machining steps can be reduced, and the mounting accuracy of the electric pump 101 to the mounting body 102 can be improved at a low cost.

[0040] Furthermore, compared to the case where the positioning pin and its insertion hole are machined at a location separate from the insertion hole 31 and fastening hole 50, machining the insertion hole 31 and press-fit hole 32 in the same process, and machining the fastening hole 50 and fitting hole 53 in the same process, improves the machining accuracy of the press-fit hole 32 and fitting hole 53. As a result, the mounting accuracy of the electric pump 101 to the mounting body 102 is improved.

[0041] Furthermore, when collars 41 and fitting holes 53 are provided in some of the multiple through holes 31 and fastening holes 50 that correspond to each other, the vibration of the electric pump 101 relative to the mounted body 102 can be reduced by appropriately selecting the through holes 31 and fastening holes 50 in which the collars 41 and fitting holes 53 are provided.

[0042] The following describes modifications of the above embodiment. 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.

[0043] (1) In the above embodiment, the object to be attached to the mounting body 102 was described using the electric pump 101 as an example. However, the object to be attached to the mounting body 102 is not limited to the electric pump 101, and may be a simple pump. In that case, only the pump unit is housed in the housing 2, and the drive shaft 1 is rotatably supported in the housing 2. In other words, the motor unit and controller are not housed in the housing 2.

[0044] (2) In the above embodiment, the electric pump 101 is fixed to the mounting body 102 by three bolts 40. However, the number of bolts 40 that fix the electric pump 101 to the mounting body 102 is not limited to three, and may be one, two, or four or more. If there is one bolt 40, a collar 41 and a fitting hole 53 are provided in the insertion hole 31 and fastening hole 50 into which the bolt 40 is attached.

[0045] (3) In the above embodiment, the collar 41 is press-fitted into the press-fit hole 32 formed in the through hole 31, and a part of the collar 41 is provided protruding from the through hole 31. In other words, the collar 41 is a separate component from the flange 30 in which the through hole 31 is formed. Alternatively, the press-fit hole 32 may not be formed in the through hole 31, and the collar 41 and flange 30 may be formed integrally. In other words, any configuration in which a cylindrical portion protruding from the through hole 31 is provided is acceptable, and the cylindrical portion may be a separate component from the flange 30 or integrally with it.

[0046] (4) In the above embodiment, the collar 41 is press-fitted into a press-fit hole 32 formed in the insertion hole 31 of the electric pump 101, and the collar 41 is fitted into a fitting hole 53 formed in the fastening hole 50 of the mounting body 102. Alternatively, a press-fit hole for the collar 41 is formed in the fastening hole 50 of the mounting body 102, and a fitting hole for the collar 41 is formed in the insertion hole 31 of the electric pump 101. In this configuration, the press-fit hole is not formed in the fastening hole 50, and the collar 41 and the mounting body 102 are formed integrally. In other words, it is sufficient to have a cylindrical portion that protrudes from the fastening hole 50, and the cylindrical portion may be a separate component from the mounting body 102 or integrated with it. Thus, the mounting structure 100 comprises a cylindrical portion that protrudes from one of the insertion hole 31 and the fastening hole 50, and a fitting hole provided in the other of the insertion hole 31 and the fastening hole 50 into which the cylindrical portion is fitted.

[0047] (5) In the above embodiment, a discharge port 22a is provided on the tip surface of the protruding portion 22 of the cover portion 20. Alternatively, a suction port may be provided on the tip surface of the protruding portion 22 of the cover portion 20. In this case, the discharge port is provided on the surface of the cover portion 20. Thus, the protruding portion 22 of the cover portion 20 is provided with a discharge port for guiding the liquid discharged from the pump portion or a suction port for guiding the liquid to the pump portion.

[0048] (6) In the above embodiment, the mounting body 102 has a housing recess 51 that accommodates a part of the housing 2 of the electric pump 101, and an insertion hole 52 formed on the bottom surface of the housing recess 51 into which the protruding portion 22 of the housing 2 is inserted. However, the housing recess 51 is not an essential component of the present invention. In this case, as shown in Figure 7, the housing recess 51 is not formed on the end face 102a of the mounting body 102, and the insertion hole 52 is formed on the end face 102a of the mounting body 102. Also, the suction port 21a that guides liquid to the pump unit communicates with a suction port (not shown) formed on the end face 102a of the mounting body 102. The flange 30 is formed on the outer surface of the circular portion 12, not on the outer surface of the rectangular portion 11.

[0049] (7) The collar 41 as a cylindrical portion may not have a perfectly circular cross-section, but may have a partially open arc shape (for example, a C shape).

[0050] The configuration, operation, and effects of the embodiments of the present invention will be described below.

[0051] This embodiment is a mounting structure 100 for attaching the housing 2 of a pump (electric pump 101) to a mounting body 102. The housing 2 has an insertion hole 31 through which a fastening member (bolt 40) is inserted, and a protruding portion 22 formed to protrude from the housing 2, which is provided with a suction port 21a for guiding liquid to the pump or a discharge port 22a for guiding liquid discharged from the pump. The mounting body 102 has a fastening hole 50 formed corresponding to the insertion hole 31 of the housing 2, through which the fastening member (bolt 40) is fastened, and an insertion hole 52 into which the protruding portion 22 of the housing 2 is inserted. The mounting structure 100 has a cylindrical portion (collar 41) provided to protrude from one of the insertion hole 31 and the fastening hole 50, through which the fastening member (bolt 40) is inserted, and a fitting hole 53 provided on the other of the insertion hole 31 and the fastening hole 50, into which the cylindrical portion (collar 41) is fitted.

[0052] In this configuration, a cylindrical portion is provided in one of the through-hole 31 through which the fastening member (bolt 40) is inserted and the fastening hole 50 into which the fastening member (bolt 40) is fastened, and a fitting hole 53 into which the cylindrical portion fits is provided in the other. Therefore, the machining of the cylindrical portion and the fitting hole 53 can be performed together with the machining of the through-hole 31 and the fastening hole 50. Thus, the mounting accuracy of the pump (electric pump 101) to the mounting body 102 can be improved at low cost.

[0053] Furthermore, the cylindrical portion (collar 41) is press-fitted into a press-fit hole 32 formed in either the insertion hole 31 or the fastening hole 50, which has an inner diameter approximately the same as the inner diameter of the fitting hole 53.

[0054] In this configuration, the press-fit hole 32 and the fitting hole 53 can be machined together with the insertion hole 31 and the fastening hole 50. Therefore, the mounting accuracy of the pump (electric pump 101) to the mounting body 102 can be improved at a low cost.

[0055] Furthermore, multiple corresponding insertion holes 31 and fastening holes 50 are provided, and the cylindrical portion (collar 41) and fitting hole 53 are provided in some of the multiple corresponding insertion holes 31 and fastening holes 50.

[0056] This configuration reduces the number of machining steps required for the cylindrical portion (collar 41) and the fitting hole 53.

[0057] Furthermore, there are three or more corresponding insertion holes 31 and fastening holes 50, and of the three or more corresponding insertion holes 31 and fastening holes 50, the cylindrical portion (collar 41) and fitting hole 53 are provided in the two that maximize the area of ​​the virtual triangle with the protruding portion 22 and the two insertion holes 31 as its vertices.

[0058] Furthermore, there are three or more corresponding insertion holes 31 and fastening holes 50, and of the three or more corresponding insertion holes 31 and fastening holes 50, the cylindrical portion (collar 41) and fitting hole 53 are provided in the two that form the closest equilateral triangle when the virtual triangle formed by the protruding portion 22 and the two insertion holes 31 is formed.

[0059] Furthermore, there are three or more corresponding insertion holes 31 and fastening holes 50, and of the three or more corresponding insertion holes 31 and fastening holes 50, the cylindrical portion (collar 41) and fitting hole 53 are provided in two of them, which pass through the center of the drive shaft 1 and straddle the imaginary line D that divides the pump section into a discharge side region and a suction side region.

[0060] These configurations reduce the number of machining steps required for the cylindrical portion (collar 41) and the fitting hole 53, and also reduce vibration of the pump (electric pump 101) relative to the mounting body 102.

[0061] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0062] This application claims priority under Japanese Patent Application No. 2023-51958, filed with the Japan Patent Office on 28 March 2023, and all contents of that application are incorporated herein by reference.

Claims

1. A mounting structure for attaching a pump housing to an object to be mounted, The aforementioned housing is An insertion hole through which the fastening member is inserted, The pump has a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and a protruding portion formed to protrude from it. The mounting body is A fastening hole formed in the housing corresponding to the insertion hole, through which the fastening member is fastened, The housing has an insertion hole into which the protruding portion is inserted, The aforementioned mounting structure is A cylindrical portion is provided that protrudes from one of the insertion hole and the fastening hole, through which the fastening member is inserted, The other of the insertion hole and the fastening hole is provided with a fitting hole into which the cylindrical portion fits, There are three or more of the corresponding insertion holes and fastening holes. A pump mounting structure in which, of the three or more mutually corresponding insertion holes and fastening holes, the cylindrical portion and the fitting hole are provided in the two that maximize the area of ​​a virtual triangle with the protruding portion and the two insertion holes as its vertices.

2. A mounting structure for attaching a pump housing to an object to be mounted, The aforementioned housing is An insertion hole through which the fastening member is inserted, The pump has a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and a protruding portion formed to protrude from it. The mounting body is A fastening hole formed in the housing corresponding to the insertion hole, through which the fastening member is fastened, The housing has an insertion hole into which the protruding portion is inserted, The aforementioned mounting structure is A cylindrical portion is provided that protrudes from one of the insertion hole and the fastening hole, through which the fastening member is inserted, The other of the insertion hole and the fastening hole is provided with a fitting hole into which the cylindrical portion fits, There are three or more of the corresponding insertion holes and fastening holes. A pump mounting structure in which, of the three or more mutually corresponding insertion holes and fastening holes, the cylindrical portion and the fitting hole are provided in the two virtual triangles formed by the protruding portion and the two insertion holes that are closest to an equilateral triangle.

3. A mounting structure for attaching a pump housing to an object to be mounted, The aforementioned housing is An insertion hole through which the fastening member is inserted, The pump has a suction port for guiding liquid to the pump or a discharge port for guiding liquid discharged from the pump, and a protruding portion formed to protrude from it. The mounting body is A fastening hole formed in the housing corresponding to the insertion hole, through which the fastening member is fastened, The housing has an insertion hole into which the protruding portion is inserted, The aforementioned mounting structure is A cylindrical portion is provided that protrudes from one of the insertion hole and the fastening hole, through which the fastening member is inserted, The other of the insertion hole and the fastening hole is provided with a fitting hole into which the cylindrical portion fits, There are three or more of the corresponding insertion holes and fastening holes. A pump mounting structure in which, of the three or more mutually corresponding insertion holes and fastening holes, the cylindrical portion and the fitting hole are provided in two locations that pass through the center of the pump's drive shaft and straddle a virtual line that divides the pump into a discharge side region and a suction side region.

4. A pump mounting structure according to claims 1 to 3, The cylindrical portion is a pump mounting structure which is press-fitted into a press-fit hole formed in one of the insertion hole and the fastening hole, having an inner diameter substantially the same as the inner diameter of the fitting hole.

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