Electric pump

Abstract

To suppress the enlargement of a mounting part where an electric pump is mounted to a mounted body.SOLUTION: An electric pump is equipped with a motor portion that rotationally drives a drive shaft, and a pump portion that is located on one side in an axial direction with respect to the motor portion. The pump portion is equipped with a pump rotor that is rotated by the driving force of the drive shaft to send a fluid from a suction side to a discharge side, and a pump housing that covers at least the one side of the pump rotor. The pump housing is equipped with a mounting surface that expands in the axial direction and contacts with a mounted body, a first channel and a second channel in which the fluid flows, and of which one side is on the suction side and the other side is on the discharge side, and a fixing part that is fixed to the mounted body by a fixing member within a range of the mounting surface and in the maximum outline of a motor housing when viewed in the axial direction. Opening parts on the mounting surfaces of the first channel and the second channel are axially deviated from each other on the mounting surfaces.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an electric pump. [Background technology]

[0002] 2. Description of the Related Art Conventionally, electric pumps have been known in which the mounting surface for mounting to a target body is provided on a side for the purpose of reducing the mounting space.

[0003] For example, Patent Document 1 discloses a structure in which an electric pump mounting portion that protrudes outward is formed on one radial side surface of the bottom of a motor case, and a plurality of mounting holes are formed in the electric pump mounting portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-105601 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the structure of Patent Document 1, the mounting hole provided in the electric pump mounting portion protrudes significantly outward from the motor case, and as a result, a large space is required to mount the oil pump. SUMMARY OF THE PRESENT DISCLOSURE In view of the above, an object of the present invention is to prevent an increase in the size of a mounting location where an electric pump is mounted to a mounting target body. [Means for solving the problem]

[0006] One aspect of the electric pump according to the present invention comprises a motor section having a drive shaft rotatably supported by a motor housing, which rotates and drives the drive shaft, and a pump section located on one axial side of the motor section along the drive shaft, which sucks in and discharges fluid, wherein the pump section rotates by the driving force of the drive shaft to send the fluid from the suction side to the discharge side, and a pump housing covering at least the one side of the pump rotor, and the pump housing further comprises a mounting surface that extends in the axial direction and contacts a body to which the pump is attached, first and second flow paths through which the fluid flows, one of which is the suction side and the other is the discharge side, and a fixing point within the range of the mounting surface and within the maximum outer shape of the motor housing when viewed in the axial direction, the fixing point being fixed to the body to which the pump is attached by a fixing member, and wherein opening points in the mounting surface of each of the first and second flow paths are offset from each other in the axial direction on the mounting surface.

[0007] Another aspect of the electric pump of the present invention comprises a motor section having a drive shaft and rotating the drive shaft, and a pump section located on one axial side of the motor section along the drive shaft and sucking in and discharging a fluid, wherein the pump section comprises a pump rotor that rotates by the driving force of the drive shaft to send the fluid from the suction side to the discharge side, and a pump housing that covers at least the one side of the pump rotor, and the pump housing further comprises a mounting surface that extends in the axial direction and contacts a substrate, first and second flow paths through which the fluid flows, one of which is the suction side and the other is the discharge side, and a fixing point within the mounting surface that is fixed to the substrate by a fixing member, and the opening points and the fixing points in the mounting surface of each of the first and second flow paths are both located on one side of the drive shaft when viewed from the mounting surface side. Effect of the Invention

[0008] According to the present invention, it is possible to suppress an increase in size of a mounting location where an electric pump is mounted to a mounting target body. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram conceptually showing the structure of an oil pump. [Diagram 2] FIG. 2 is a perspective view showing the appearance of the pump unit. [Diagram 3] FIG. 3 is a diagram showing the external appearance of the pump portion as viewed from one axial side. [Figure 4] FIG. 4 is a perspective view showing the external structure of the pump cover. [Diagram 5] FIG. 5 is a diagram illustrating the operation of the pump portion. [Figure 6] FIG. 6 is a structural diagram showing the structure of the suction passage and the discharge passage provided inside the pump cover. [Figure 7] FIG. 7 is a view showing the pump cover as viewed from one axial side. [Figure 8] FIG. 8 is a diagram showing the pump cover as viewed from a direction perpendicular to the axial direction and parallel to the mounting surface. [Figure 9] FIG. 9 is a diagram showing the pump cover as viewed from a direction perpendicular to both the axial direction and the mounting surface. [Figure 10] FIG. 10 is a perspective view showing the external appearance of the pump section 130 and the motor section 110 as viewed from the opposite side to the mounting plate section 134. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the present disclosure and embodiments of the electric pump will be described in detail with reference to the accompanying drawings. However, in order to avoid the following description becoming unnecessarily redundant and to facilitate understanding by those skilled in the art, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters and duplicated description of substantially the same configuration may be omitted. In addition, elements shown in the previously described figures may be appropriately referenced in the description of the later figures. FIG. 1 is a diagram conceptually showing the structure of an oil pump. The oil pump 100 corresponds to one embodiment of the electric pump of the present invention. The oil pump 100 includes a motor section 110, a sensor section 120, and a pump section 130. The motor unit 110 receives a supply of electric power and generates a rotational driving force. The sensor unit 120 detects the rotation of the motor unit 110 . The pump unit 130 is driven by the motor unit 110 and sucks and discharges oil. The pump section 130 corresponds to an example of the pump section according to the present invention. The motor section 110 includes a motor housing 111 , a drive shaft 112 , a rotor 113 , a stator 114 , and a bearing 115 .

[0011] The drive shaft 112 is a member that transmits the rotational driving force of the motor unit 110, and is rotatably supported by the motor housing 111 via a bearing 115. In other words, the motor unit 110 has the drive shaft 112 rotatably supported by the motor housing 111, and a motor that rotates the drive shaft 112 is

[0012] In the following description, the drive shaft 112 is used as a reference for direction, and the direction along the drive shaft 112 may be referred to as the axial direction. In addition, in the following description, regardless of the direction shown, the lower side in Fig. 1 may be referred to as one axial side, and the upper side in Fig. 1 may be referred to as the other axial side. Furthermore, in the following description, the direction perpendicular to the rotation center line of the drive shaft 112 may be referred to as the radial direction, the side closer to the drive shaft 112 may be referred to as the radial inner side, and the side farther from the drive shaft 112 may be referred to as the radial outer side.

[0013] The motor housing 111 is a structure that supports the motor section 110 and the oil pump 100 as a whole, and is formed, for example, by pressing a metal plate. The motor housing 111 has a cylindrical section 111a that extends in the axial direction and a flange section 111b that spreads outward from one axial end of the cylindrical section 111a, and the motor housing 111 has its maximum outer shape at the outer edge of the flange section 111b. The motor housing 111 accommodates a rotor 113 and a stator 114 inside. The rotor 113 is fixed to the drive shaft 112, has a permanent magnet built in, for example, and rotates together with the drive shaft 112 by the action of a rotating magnetic field.

[0014] Stator 114 is accommodated in motor housing 111 facing rotor 113 and generates a rotating magnetic field. Note that, although this embodiment shows an inner rotor type structure in which stator 114 is disposed radially outside rotor 113, the motor of the present invention may have an outer rotor type structure in which stator 114 is disposed radially inside rotor 113.

[0015] The bearing 115 is, for example, a ball bearing, and rotatably supports the drive shaft 112. The bearing 115 may be a roller bearing, a sliding bearing, or the like. The bearings 115 are arranged on one axial side and the other axial side across the rotor 113, with the bearing 115 on the other axial side fixed to the housing 111 and the bearing 115 on the one axial side held by, for example, the pump section 130.

[0016] The sensor unit 120 includes a board case 121, and an end of a conductor drawn from a coil of the stator 114 is guided to the board case 121. In this embodiment, the board case 121 is used as a space for drawing out wiring to the motor unit 110. The board case 121 also houses and holds, for example, a sensor board 122 therein. The sensor board 122 has a magnetic sensor and detects, for example, the rotational position and rotational speed of the drive shaft 112. The board case 121 may house a control board or an inverter board together with the sensor board 122 or instead of the sensor board 122. The electric pump of the present invention may not have the sensor unit 120.

[0017] The pump section 130 has a pump rotor 131, a pump body 132, and a pump cover 133. The pump section 130 is disposed on one axial side of the motor housing 111. In other words, the pump section 130 is located on one axial side along the drive shaft 112 with respect to the motor section 110, and sucks in and discharges a fluid (oil as an example). In this embodiment, the fluid will be described as oil, but the following description can be applied to any general fluid. The pump rotor 131 is rotated by the driving force of the drive shaft 112 to send oil from the suction side to the discharge side. FIG. 2 is a perspective view showing the external appearance of pump section 130, and FIG. 3 is a view showing the external appearance of pump section 130 as viewed from one axial side.

[0018] The pump body 132 houses the pump rotor 131 and is fixed to the motor housing 111. In this embodiment, the pump body 132 has a space for housing the pump rotor 131, and the pump cover 133 serves as a lid that covers the space and one axial side of the pump rotor 131. The pump cover 133 corresponds to an example of a pump housing according to the present invention, which covers at least one axial side of the pump rotor 131 .

[0019] In this embodiment, the motor housing 111, the pump body 132, and the pump cover 133 are separate components, but the electric pump of the present invention may be one in which the pump body 132 is integrated with the motor housing 111, or one in which the pump body 132 is integrated with the pump cover 133. When the pump body 132 is integrated with the motor housing 111, this corresponds to an example of the motor housing referred to in the present invention, and when the pump body 132 is integrated with the pump cover 133, this corresponds to an example of the pump housing referred to in the present invention.

[0020] The pump cover 133 is connected to the pump body 132 by being screwed to the pump body 132 with a plurality of bolts 180. The bolts 180 correspond to an example of the connecting member referred to in the present invention. Note that, in addition to bolts, press-fit pins, rivets, etc. may also be used as the connecting member referred to in the present invention.

[0021] The pump cover 133 has a plate-shaped mounting plate portion 134 for mounting the oil pump 100 to a mounting body, such as an oil pan of an automobile. The mounting plate portion 134 has a mounting surface 134a that spreads in the axial direction, and the oil pump 100 is fixed to the mounting body by a fixing member with the mounting surface 134a in contact with the mounting body. In other words, the pump cover 133 has a mounting surface 134a that spreads in the axial direction and contacts the mounting body. The pump cover 133 also includes a mounting plate portion 134 that protrudes in a plate shape to one side in the axial direction and has the mounting surface 134a. For example, a bolt, a press-fit pin, a rivet, or the like can be used as the fixing member. In this embodiment, a bolt is used as the fixing member in consideration of ease of disassembly, etc.

[0022] The pump cover 133 has a first flow passage 140 (see FIG. 6) and a second flow passage 150 (see FIG. 6) through which oil flows, one of which is the suction side and the other of which is the discharge side, and openings 141, 151 of the first flow passage 140 and the second flow passage 150 are present on the mounting surface 134a. The positions of the openings 141, 151 differ from each other in the axial direction (the vertical direction in FIG. 2).

[0023] In this embodiment, oil is sucked in from the first flow passage 140 side and discharged to the second flow passage 150 side, so in the following description, the first flow passage 140 may be referred to as the suction passage 140, and the second flow passage 150 may be referred to as the discharge passage 150. Also, the opening 141 of the first flow passage (suction passage) 140 on the mounting surface 134a may be referred to as the suction port 141, and the opening 151 of the second flow passage (discharge passage) 150 on the mounting surface 134a may be referred to as the discharge port 151.

[0024] On the mounting surface 134a, there are provided a plurality of (for example, four) fixing points 161, 162, 163, 164 that are fixed to a mounting target by bolts, which are an example of fixing members. Of the four fixing points 161, ..., 164, the three fixing points 161, 163, 164 excluding the second fixing point 162 are located within the range of the flange portion 111b of the motor housing 111 as viewed in the axial direction, as shown in Fig. 3.

[0025] In this embodiment, the pump cover 133 has fixing points 161, 163, 164 that are fixed to a mounting body by fixing members within the range of the mounting surface 134a and within the maximum outer shape of the motor housing 111 when viewed in the axial direction, and the locations of the openings 141, 151 in the mounting surface 134a of the first flow path 140 and the second flow path 150 are shifted from each other in the axial direction on the mounting surface 134a. By shifting the locations of the openings (i.e., the suction port 141 and the discharge port) in the axial direction, the size of the first flow path 140 and the second flow path 150 as a whole in the radial direction is reduced, and further, by fitting the fixing points 161, 163, 164 within the maximum outer shape of the motor housing 111, an increase in size of the mounting plate portion 134 is reduced.

[0026] In this embodiment, the locations of suction port 141 and discharge port 151 on mounting surface 134a are also shifted from each other on mounting surface 134a in a direction intersecting the axial direction (left and right direction in the figure). This allows suction port 141 and discharge port 151 to be close to each other in both the radial and axial directions, so that the sizes of suction path 140 and discharge path 150 as a whole are suppressed in both the radial and axial directions, and the increase in size of mounting plate portion 134 is suppressed in both the axial and radial directions.

[0027] Of the four fixing points 161, ..., 164, the first fixing point 161 is a through hole through which a bolt passes from the back side to the front side in Figure 2 (i.e., from the oil pump 100 side to the mounting body side), and the second fixing point 162 is a female threaded hole that passes through the mounting plate portion 134 and into which a bolt is screwed from the front side to the back side in Figure 2 (i.e., from the mounting body side to the oil pump 100 side). The third and fourth fixing points 163, 164 are bottomed holes recessed from the mounting surface 134a and have a bottom, and are stepped holes that are wider on the opening side and narrower on the back side, with the narrower back parts 163b, 164b being female threaded holes.

[0028] The wide opening portions 163a, 164a of the third and fourth fixing points 163, 164 are used for positioning by contacting the inner walls (including the cylindrical portion and the bottom portion) with a ring-shaped positioning protrusion provided on the mounting body. In other words, the third and fourth fixing points 163, 164 are stepped holes that open to the mounting surface 134a and have an inner diameter on the back side smaller than the inner diameter on the opening side, and the opening sides 163a, 164a of the stepped holes contact the positioning protrusion of the mounting body, and the back sides 163b, 164b of the stepped holes contact the fixing member. Therefore, positioning and fixing are concentrated in one fixing point, so that the size of the mounting plate part 134 is further suppressed. Note that the contact with the positioning protrusion on the opening sides 163a, 164a may be only one of the cylindrical portion and the bottom portion of the inner walls.

[0029] The increase in size of the mounting plate portion 134 is suppressed by having at least one of the fixing points 161, ..., 164 fit within the maximum outer shape of the motor housing 111. However, the increase in size of the mounting plate portion 134 is further suppressed by having all of the fixing points 161, 163, 164, except for at most one exceptional fixing point 162, fit within the maximum outer shape of the motor housing 111. In addition, when the fixing point 161 of the through hole fits within the maximum outer shape of the motor housing 111, the space for inserting the fixing member (bolt) into the fixing point 161 from the oil pump 100 side also fits within the maximum outer shape of the motor housing 111, which is effective in suppressing the increase in size. Furthermore, when at least one of each of the through hole fixing point 161 and the fixing points 162, 163, 164 having female threaded holes is present within the maximum outer dimensions of the motor housing 111, the oil pump 100 is firmly fixed from both the oil pump 100 side and the mounting body side by fixing members (bolts), thereby realizing both suppression of size increase and improvement of fixing strength. FIG. 4 is a perspective view showing the external structure of the pump cover 133. As shown in FIG. FIG. 4 shows a mounting surface 134a of the mounting plate portion 134, as well as a cover surface 133a that covers the pump body 132 and the pump rotor 131.

[0030] An opening 142a of the suction passage 140 and an opening 152a of the discharge passage 150 are provided on a cover surface 133a of the pump cover 133, and each of the openings 142a, 152a is an arc-shaped opening extending in the circumferential direction around the drive shaft 112. The pump cover 133 is provided with a suction port 142 and a discharge port 152 recessed from each of the openings 142a, 152a on the cover surface 133a toward one side in the axial direction.

[0031] 4, the center line of the drive shaft 112 is indicated by a dashed line, and the intake port 141, the discharge port 151, and the four fixing points 161, ..., 164 provided on the mounting surface 134a of the mounting plate portion 134 are located to the left of the center line of the drive shaft 112 indicated by the dashed line in the figure. In other words, the openings 141, 151 and the fixing points 161, 162, 163, 164 on the mounting surface 134a of each of the first flow path 140 and the second flow path 150 are all located on one side of the drive shaft 112 when viewed from the mounting surface 134a side. This arrangement close to one side prevents the mounting plate portion 134 having the mounting surface 134a from becoming large. Here, the operation of the pump section 130 will be described. FIG. 5 is a diagram illustrating the operation of the pump unit 130. As shown in FIG.

[0032] The pump rotor 131 of the pump section 130 has an inner rotor 131a fixed to the drive shaft 112, and an outer rotor 131b meshed with the inner rotor 131a. The suction port 142 and the discharge port 152 provided in the pump cover 133 open toward the pump rotor 131 side.

[0033] As the inner rotor 131a is driven to rotate together with the drive shaft 112, the outer rotor 131b rotates around a rotation center at a position different from the rotation center of the inner rotor 131a. As the positions of the rotation centers of the inner rotor 131a and the outer rotor 131b are different, a chamber (space) 131c into which oil enters is generated between the inner rotor 131a and the outer rotor 131b. The oil chamber 131c moves with the rotation of the pump rotor 131. For example, in the case of clockwise rotation as shown in FIG. 5, the oil chamber 131c also moves clockwise. As a result, oil is sent from the suction port 142 side to the discharge port 152 side, and the suction and discharge of oil are realized.

[0034] As the drive shaft 112 is rotated counterclockwise in FIG. 5, the oil is suctioned and discharged in the opposite direction. However, for ease of explanation, the drive shaft 112 and pump rotor 131 are assumed to be rotated clockwise as shown in FIG. 5. FIG. 6 is a structural diagram showing the structure of the suction passage 140 and the discharge passage 150 provided inside the pump cover 133. As shown in FIG.

[0035] The suction passage 140 has the above-mentioned suction inlet 141 and suction port 142. The suction passage 140 also has an extension portion 143 that extends from the suction inlet 141 in a direction intersecting with the mounting surface 134a and is connected to the suction port 142.

[0036] The suction port 142 is recessed from an opening 142a facing the pump rotor 131 toward one side in the axial direction, and the bottom on one side in the axial direction is narrower than the width of the opening 142a. The suction port 142 extends in an arc shape as a whole, and one end 142b of the arc shape is connected to an extension portion 143.

[0037] Discharge passage 150 has the above-mentioned discharge outlet 151 and discharge port 152. Discharge passage 150 also has an attachment side extension portion 153 extending from discharge outlet 151 in a direction intersecting with mounting surface 134a, and a pump side extension portion 154 extending from discharge port 152 in a direction intersecting with the axial direction and along mounting surface 134a.

[0038] The attachment side extension 153 and the pump side extension 154 are connected, but the attachment side extension 153 (the center line of the attachment side extension 153) and the pump side extension 154 (the center line of the pump side extension 154) are in a twisted position that is offset in the axial direction. An end 154a of the pump side extension 154 opposite the discharge port 152 is closed by a cap member (not shown).

[0039] The discharge port 152 is recessed from an opening 152a facing the pump rotor 131 toward one side in the axial direction, and the bottom on one side in the axial direction is narrower than the width of the opening 152a. The bottom of the discharge port 152 is located on the other side in the axial direction compared to the bottom of the suction port 142, and the depth from the openings 142a, 152a to the bottom of the suction port 142 is deeper than that of the discharge port 152.

[0040] The pump rotor 131 shown in FIG. 5, the space in which the pump rotor 131 is housed, and the suction passage 140 and the discharge passage 150 shown in FIG.

[0041] Of the four fixing points provided on the mounting surface 134a described above, the fourth fixing point 164 is a bottomed recess that opens to the mounting surface 134a side, and the recess is extended to the bottom side to reach the suction port 142 included in the functional part of the pump section 130. By providing the fourth fixing point 164 at such a position, it is possible to fix the mounting plate section 134 with a fixing member even at a location that overlaps with the functional part of the pump section 130 when viewed from the mounting surface side, so that an increase in size of the mounting plate section 134 is further suppressed.

[0042] As described above, in this embodiment, the size of the mounting plate portion 134 is suppressed. However, since the mounting plate portion 134 has a plate-like structure that protrudes to one side in the axial direction, vibrations are likely to occur due to the operation of the motor portion 110 and the pump portion 130, and a structure that suppresses noise and damage is required.

[0043] Fig. 7 is a diagram showing pump cover 133 as viewed from one axial side, Fig. 8 is a diagram showing pump cover 133 as viewed from a direction perpendicular to the axial direction and parallel to mounting surface 134a, and Fig. 9 is a diagram showing pump cover 133 as viewed from a direction perpendicular to both the axial direction and mounting surface 134a. Fig. 10 is a perspective view showing the external appearance of pump section 130 and motor section 110 as viewed from the opposite side to mounting plate section 134.

[0044] A combination of multiple types of ribs are formed on one axial side of the pump cover 133, and these ribs increase the rigidity of the pump cover 133. Each rib protrudes in a plate-like manner toward one axial side and extends along the paper surface of Fig. 7. Specifically, orthogonal ribs 171 and 172 extending perpendicular to the mounting surface 134a, parallel ribs 173, 174 and 175 extending parallel to the mounting surface 134a, a diagonal rib 176 extending diagonally with respect to the mounting surface 134a, and arc-shaped ribs 177 and 178 extending in an arc are provided.

[0045] In other words, the pump cover 133 has orthogonal ribs 171, 172 that protrude in a plate shape toward one axial side and extend in a direction intersecting with the mounting surface 134a (for example, a direction perpendicular to the mounting surface 134a). The orthogonal ribs 171, 172 improve the rigidity of the pump housing and suppress vibration.

[0046] The pump cover 133 also includes parallel ribs 173, 174, and 175 that protrude in a plate shape toward one side in the axial direction and extend in a direction along (for example, a direction parallel to) the mounting surface 134a. The parallel ribs also improve the rigidity of the pump cover 133, thereby suppressing vibration.

[0047] The pump cover 133 also includes a diagonal rib 176 that protrudes in a plate shape toward one side in the axial direction and extends in a direction connecting the bolt 180, which is a connecting member, to the fixing points 161, 164. The diagonal rib 176 improves the rigidity of the pump cover 133 and suppresses vibration. The bolt 180, which is a connecting member, can also be effectively used as part (extension) of the rib. 10, the provision of the diagonal rib 176 forms a structure that extends from the fixing point 161 of the mounting plate portion 134 through the diagonal rib 176, the bolt 180, and the pump body 132 to the rib 111c of the motor housing 111. This structure improves the rigidity from the pump cover 133 to the motor housing 111. In addition, this structure extends in a direction intersecting the mounting surface 134a and passes through the bolt 180 that is the furthest from the mounting plate portion 134 among the multiple bolts 180, thereby integrating the pump cover 133, the pump body 132, and the motor housing 111 with the mounting plate portion 134, thereby further improving the rigidity.

[0048] Furthermore, the pump cover 133 has arc-shaped ribs 177, 178 that protrude in a plate shape toward one side in the axial direction and extend in the circumferential direction around the drive shaft 112 and in the direction connecting the bolts 180, which are connecting members. The arc-shaped ribs improve the rigidity of the pump housing and suppress vibration. In addition, the bolts 180, which are connecting members, can be functionally used as part (extension) of the ribs.

[0049] It is preferable that the pump cover 133 has a combination of multiple types of ribs among the above-mentioned orthogonal ribs 171, 172, parallel ribs 173, 174, 175, diagonal rib 176, and arcuate ribs 177, 178, since this synergistically improves the rigidity.

[0050] The first orthogonal rib 171 extends from the mounting plate portion 134 and directly supports the mounting plate portion 134 to increase the rigidity of the pump cover 133. The second orthogonal rib 172 protrudes in a plate shape to one side in the axial direction and extends in a direction connecting the bolts 180, which are connecting members. The second orthogonal rib 172 increases the rigidity of the pump cover 133 and suppresses vibration. The bolts 180, which are connecting members, can also be functionally used as part (extension) of the rib.

[0051] As shown in Fig. 8, the ridgeline of each of the orthogonal ribs 171, 172 is inclined at an angle, and the height of each of the orthogonal ribs 171, 172 is higher on the mounting plate portion 134 side (right side in Fig. 8) than on the opposite side. This makes it possible to suppress an increase in size while improving rigidity. Also, when the heights of the parallel ribs 173, 174, 175 are compared, the mounting plate portion 134 side (right side in Fig. 8) is higher than the opposite side (left side in Fig. 8). This also makes it possible to suppress an increase in size while improving rigidity.

[0052] The first parallel ribs 173 extend from the mounting plate portion 134 in a direction along the mounting surface 134a. The first parallel ribs 173 also extend toward the bolts 180 that are connecting members. A portion of the first parallel ribs 173 surrounds the bolts 180. Such first parallel ribs 173 increase the rigidity of the pump cover 133, and the bolts 180 are effectively used as a portion (extension) of the ribs.

[0053] As shown in Fig. 9, the parallel ribs 173, 174, 175 have ridgelines that are inclined at an angle, and the side facing the mounting plate portion 134 (the left side in Fig. 9) is higher than the opposite side. This makes it possible to improve rigidity while preventing the device from becoming too large.

[0054] In this embodiment, an oil pump is given as an example of a use of the electric pump of the present invention, but the use of the electric pump of the present invention is not limited to the above. The electric pump of the present invention can also be used as a pump that sucks in and discharges water, air, etc. Although the motor housing formed by press working is exemplified above, the motor housing according to the present invention may be formed by die casting or injection molding.

[0055] The above-described embodiment should be considered as illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above-described embodiment, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0056] 100: Oil pump 110: Motor section 111: Motor case 112: Drive shaft 113: Rotor 114: Stator 115: Bearings 120: Sensor section 121: Circuit board case 122: Sensor board 130: Pump section 131: Pump rotor 131a: Inner rotor 131b: Outer rotor 132: Pump body 133: Pump cover 133a: Cover surface 134: Mounting plate 134a: Mounting surface 140: Intake passage (first passage) 141: Intake port (opening) 142: Intake port 142a: Intake passage opening 143: Stretching part 150: Discharge passage (second passage) 151:Discharge port (opening) 152: Discharge port 152a: Opening of discharge passage 153: Mounting side extension 154: Pump side extension 161, 162, 163, 164: Fixed points 171, 172: Orthogonal ribs 173,174,175 :Parallel ribs 176: Diagonal rib 177, 178: Arc rib 180: Bolt

Claims

1. a motor section having a drive shaft rotatably supported by a motor housing and rotating the drive shaft; a pump section that is located on one side of the motor section in an axial direction along the drive shaft and that draws in and discharges a fluid, The pump unit is a pump rotor that rotates by the driving force of the drive shaft to send the fluid from a suction side to a discharge side; a pump cover located on one axial side of the motor housing, The pump cover covers the pump rotor from one axial side, Furthermore, the pump cover A mounting surface that extends in the axial direction and contacts a target body; a first flow path and a second flow path through which the fluid flows, one of which is an intake side and the other of which is a discharge side; a fixing portion that is fixed to the mounted body by a fixing member within the range of the mounting surface and within a maximum outer shape of the motor housing as viewed in the axial direction, The first flow path is A first opening portion that opens to the mounting surface; a first port provided in the pump cover; The first flow passage has an extension portion that extends from the first opening location in a direction intersecting with the mounting surface and is connected to the first port, The second flow path is A second opening portion that opens to the mounting surface; a second port provided in the pump cover, The second flow path is An attachment side extension portion extending in a direction intersecting the attachment surface; a pump side extension portion extending from the second port in a direction perpendicular to the axial direction and along the mounting surface, The attachment side extension portion and the pump side extension portion are connected to each other, The first opening location and the second opening location are offset from each other in the axial direction on the mounting surface of the electric pump.

2. A motor unit having a drive shaft and rotating the drive shaft; a pump section that is located on one side of the motor section in an axial direction along the drive shaft and that draws in and discharges a fluid, The pump unit is a pump rotor that rotates by the driving force of the drive shaft to send the fluid from a suction side to a discharge side; a pump cover located on one axial side of a motor housing of the motor portion, The pump cover covers the pump rotor from one axial side, Furthermore, the pump cover A mounting surface that extends in the axial direction and contacts a target body; a first flow path and a second flow path through which the fluid flows, one of which is an intake side and the other of which is a discharge side; a fixing portion that is fixed to the mounted body by a fixing member within the range of the mounting surface and within a maximum outer shape of the motor housing as viewed in the axial direction, The first flow path is A first opening portion that opens to the mounting surface; a first port provided in the pump cover; The first flow passage has an extension portion that extends from the first opening location in a direction intersecting with the mounting surface and is connected to the first port, The second flow path is A second opening portion that opens to the mounting surface; a second port provided in the pump cover, The second flow path is An attachment side extension portion extending in a direction intersecting the attachment surface; a pump side extension portion extending from the second port in a direction perpendicular to the axial direction and along the mounting surface, The attachment side extension portion and the pump side extension portion are connected to each other, An electric pump in which the first opening location, the second opening location and the fixing location are all located on one side of the drive shaft as viewed from the mounting surface side.

3. 3. The electric pump according to claim 1, wherein the fixing portion is a bottomed recess that opens toward the mounting surface, and a functional portion of the pump portion is present at a bottom end of the recess.

4. 4. The electric pump according to claim 1, wherein the fixing point is a stepped hole that opens into the mounting surface and has an inner diameter on a rear side that is smaller than the inner diameter on the opening side, the opening side of the stepped hole contacting a positioning protrusion on the mounting body and the rear side of the stepped hole contacting the fixing member.

5. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; The electric pump according to claim 1 , further comprising: a first rib protruding in a plate-like shape toward the one side and extending in a direction intersecting with the mounting surface.

6. The electric pump according to claim 5 , wherein the height of the first rib is greater on the side of the mounting plate portion than on the opposite side.

7. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; The electric pump according to claim 1 , further comprising: a second rib protruding in a plate-like shape toward the one side and extending in a direction along the mounting surface.

8. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; a coupling member that couples the pump cover to another member located on the other side of the one side; The electric pump according to claim 1 , further comprising: a third rib that protrudes in a plate shape toward the one side and extends in a direction connecting the connecting member and the fixed portion.

9. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; A plurality of connecting members that connect the pump cover to another member located on the other side of the one side; The electric pump according to claim 1 , further comprising: a fourth rib protruding in a plate shape toward the one side and extending in a direction connecting the connecting members to each other.

10. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; A plurality of connecting members that connect the pump cover to another member located on the other side of the one side; The electric pump according to claim 1 , further comprising: a fifth rib that protrudes in a plate shape toward the one side and extends in a circumferential direction around the drive shaft and in a direction connecting the connecting members to each other.

11. The pump cover further comprises: a mounting plate portion protruding in a plate shape toward the one side and having the mounting surface; The electric pump according to claim 1 , further comprising: a sixth rib that protrudes in a plate shape toward the one side and extends from the mounting plate portion in a direction along the mounting surface.

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