Electric pump

Abstract

To easily install and manufacture electric pumps. [Solution] The electric pump 100 comprises a motor unit 15, a pump unit 10, and a housing 20 that houses the motor unit 15 and the pump unit 10. The housing 20 has a main body 30 and a cover 40 that is attached to the main body 30 and covers the pump unit 10. The cover has an annular flange 41 attached to the main body 30, a cylindrical 45 formed concentrically with the flange 41 and projecting axially from the flange 41, a suction port 51 for guiding liquid to the pump unit 10, and a discharge port 52 for guiding liquid discharged from the pump unit 10. One of the suction port 51 and the discharge port 52 is formed on the inside of the cylindrical 45, and the other of the suction port 51 and the discharge port 52 is formed on the flange 41, opening to the outer circumferential surface 41a of the flange 41.

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses an electric oil pump including a pump section composed of a pump rotor and an outer rotor housed in a pump housing, and an electric motor section housed in the pump housing. A pump cover is attached to the pump housing. The pump cover is formed in a cylindrical shape protruding from the surface and has a discharge port communicating with the discharge port of the pump section, and a suction port formed beside the discharge port and communicating with the suction port of the pump section.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electric oil pump described in Patent Document 1, the cylindrical discharge port is provided offset from the center of the pump cover. Therefore, when installing the electric oil pump, the electric oil pump must be installed in a predetermined orientation in order to fit the discharge port into the flow path of the attachment object, which takes time to install the electric oil pump. In addition, since the cylindrical discharge port is provided in a special shape offset from the center of the pump cover and the positional accuracy of the cylindrical discharge port is required, the manufacture of the pump cover is not easy.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide an electric pump that can be easily installed and is easy to manufacture.

Means for Solving the Problems

[0006] The present invention relates to an electric pump comprising a motor unit for driving a drive shaft, a pump unit connected to the drive shaft for discharging liquid, and a housing for housing the motor unit and the pump unit. The housing comprises a main body and a cover unit attached to the main body and covering the pump unit. The cover unit comprises an annular flange unit attached to the main body, a cylindrical unit formed concentrically with the flange unit and projecting axially from the flange unit, a suction port for guiding liquid to the pump unit, and a discharge port for guiding liquid discharged from the pump unit. One of the suction port and the discharge port is formed on the inside of the cylindrical unit, and the other of the suction port and the discharge port is formed on the flange unit, opening to the outer circumferential surface of the flange unit.

[0007] In this invention, a cylindrical portion, on which one of the suction port and the discharge port is formed on the inside, is formed concentrically with the flange portion. Therefore, the cylindrical portion can be fitted into the mounting object regardless of the orientation (circumferential position) of the electric pump, making it easy to install the electric pump and simplifying the manufacturing of the housing cover. Furthermore, even though the cylindrical portion is formed concentrically with the flange portion, the other of the suction port and the discharge port is formed to open onto the outer circumferential surface of the flange portion, which is outside the cylindrical portion, thus allowing the discharge side and the suction side to be separated by the cylindrical portion.

[0008] The present invention is characterized in that the port formed in the flange portion is a notch formed in the radial direction.

[0009] In this invention, since the liquid sucked in or discharged from the port formed in the flange flows radially, when the port and the flow path of the mounted object face each other radially, the liquid can be smoothly supplied to and discharged from the flow path.

[0010] The present invention is characterized in that a bridge portion is formed at the boundary between the cylindrical portion and the flange portion, extending across the port formed in the flange portion in the circumferential direction of the cylindrical portion.

[0011] In this invention, the strength of the flange portion can be improved by reinforcing the area around the port, where the strength of the flange portion is low, with the bridge portion. [Effects of the Invention]

[0012] According to the present invention, an electric pump can be easily installed and easily manufactured. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of an electric pump according to an embodiment of the present invention. [Figure 2] This is a perspective view of the pump section of an electric pump according to an embodiment of the present invention. [Figure 3] This is a plan view of the pump section of an electric pump according to an embodiment of the present invention, showing the state with the cover removed. [Figure 4] This is a cross-sectional view of the pump section of an electric pump according to an embodiment of the present invention. [Figure 5] This is a side view of an electric pump and a mounting body according to an embodiment of the present invention, the mounting body being shown in a cross-sectional view. [Figure 6] This is a perspective view of the pump section of an electric pump according to a modified example 2 of the present invention. [Figure 7] This is a perspective view of the pump section of an electric pump according to a modified example 3 of the present invention. The body is shown in cross-sectional view. [Modes for carrying out the invention]

[0014] Hereinafter, an electric pump 100 according to an embodiment of the present invention will be described with reference to the drawings. The electric pump 100 is, for example, mounted on a vehicle and discharges a coolant (liquid) to cool an electric motor mounted on the vehicle, or discharges oil (liquid) to lubricate gears mounted on the vehicle. The electric pump 100 may also be used as a fluid pressure supply source that discharges a working fluid (liquid) to drive equipment. Furthermore, the electric pump 100 may be mounted on industrial machinery other than vehicles.

[0015] Figure 1 is a perspective view of the electric pump 100, Figure 2 is a perspective view of the pump section 10 of the electric pump 100, and Figure 3 is a plan view of the pump section 10. Figure 3 shows the pump section with the cover section 40, which will be described later, removed. Note that Figure 3 is a plan view of the pump section 10 as seen from below in Figure 1.

[0016] As shown in Figures 1-3, the electric pump 100 comprises a motor unit 15 (see Figure 1) that drives the drive shaft 1 (see Figure 3), a pump unit 10 connected to the drive shaft 1 that discharges liquid, a control unit 17 (see Figure 1) that controls the motor unit 15, and a housing 20 that houses the motor unit 15, the pump unit 10, and the control unit 17. The arrow in Figure 3 indicates the direction of rotation of the drive shaft 1.

[0017] The motor unit 15 has an annular stator (not shown) and a motor rotor (not shown) arranged radially inward of the stator. The motor rotor rotates around the drive shaft 1 due to the interaction between the magnetization state of the stator core and the permanent magnets (not shown) of the motor rotor. A known configuration can be used for the motor unit 15, so a detailed explanation is omitted.

[0018] As shown in FIG. 3, the pump unit 10 is an internal gear pump having an inner rotor 11 to which the drive shaft 1 is connected and an outer rotor 12 disposed outside the inner rotor 11. The inner rotor 11 and the outer rotor 12 are housed in a housing 20 (specifically, a main body portion 30 described later), are provided eccentric to each other, and are covered by a cover portion 40 of the housing 20. Specifically, the inner rotor 11 is provided with its center coinciding with the center of the drive shaft 1, and the outer rotor 12 is provided with its center displaced downward from the drive shaft 1 in FIGS. 2 and 3. The inner rotor 11 has a plurality of external teeth 11a on its outer peripheral surface, and the outer rotor 12 has a plurality of internal teeth 12a that are in sliding contact with the external teeth 11a on its inner peripheral surface. The external teeth 11a and the internal teeth 12a are formed with different numbers of teeth, and pump chambers 13 are defined by adjacent external teeth 11a of the inner rotor 11 and internal teeth 12a of the outer rotor 12. A plurality of pump chambers 13 are formed in the pump unit 10. In this embodiment, the configuration in which the pump unit 10 is an internal gear pump has been described, but other pumps such as vane pumps may be used.

[0019] The control unit 17 controls the current supplied to the stator in order to drive the motor unit 15, and includes a substrate (not shown) and electronic components (not shown) such as magnetic sensors mounted on the substrate. Since a known configuration can be adopted for the configuration of the control unit 17, a detailed description thereof will be omitted.

[0020] When the drive shaft 1 is rotated by the motor unit 15, the inner rotor 11 and the outer rotor 12 rotate while the external teeth 11a of the inner rotor 11 are in sliding contact with the internal teeth 12a of the outer rotor 12. As the inner rotor 11 and the outer rotor 12 rotate, the volume of the pump chamber 13 repeats expansion and contraction. In the expansion region (suction region) where the pump chamber 13 expands, liquid is sucked through a suction port 51 of the housing 20 described later, and in the contraction region (discharge region) where the pump chamber 13 contracts, the liquid is discharged and led to the outside through a discharge port 52 of the housing 20 described later.

[0021] As shown in Figures 1-3, the housing 20 has a main body 30 that houses the pump unit 10, the motor unit 15, and the control unit 17, and a cover unit 40 (see Figures 1 and 2) that is attached to the main body 30 and covers the pump unit 10. The main body 30 and the cover unit 40 are arranged side by side in the axial direction of the drive shaft 1. A pair of mounting flanges 35 (see Figures 1 and 5) for attaching the electric pump 100 to the mounting body 102, as will be described later, are formed on the outer circumferential surface of the area of ​​the main body 30 that houses the motor unit 15. The mounting flanges 35 have through holes 36 (see Figure 1) through which fixing members 70 (see Figure 5), such as bolts, are inserted.

[0022] As shown in Figure 3, the main body 30 has a through hole (not shown) through which the drive shaft 1 is inserted, and a pump housing recess 31 in which the pump unit 10 is housed. The pump housing recess 31 is a recess with a circular bottom surface, and the inner rotor 11 and outer rotor 12 of the pump unit 10 are housed inside, eccentrically relative to each other. Specifically, the center of the pump housing recess 31 coincides with the center of the outer rotor 12 and is offset from the center of the drive shaft 1. Multiple fastening holes 32 are formed on the end face 30a of the main body 30, through which fastening members 50 (see Figure 2), such as bolts for attaching the cover unit 40, are fastened.

[0023] As shown in Figure 2, the cover portion 40 is provided so as to cover the pump housing recess 31 in which the inner rotor 11 and outer rotor 12 are housed. The cover portion 40 is attached to the end face 30a of the main body portion 30 by fastening members 50. The cover portion 40 has an annular flange portion 41 attached to the end face 30a, a cylindrical portion 45 formed projecting axially from the flange portion 41, a suction port 51 for guiding liquid from the outside to the pump chamber 13 of the pump portion 10, and a discharge port 52 for guiding liquid discharged from the pump chamber 13 to the outside. The axial direction of the flange portion 41 is the same as the axial direction of the drive shaft 1, and hereafter, the axial direction of both will simply be referred to as the "axial direction".

[0024] The flange portion 41 is formed to have the same outer diameter as the main body portion 30 of the housing 20. A cylindrical portion 45 is continuously formed on the flange portion 41. The discharge port 52 is formed on the flange portion 41 and opens onto the outer circumferential surface 41a of the flange portion 41. The discharge port 52 is a notch formed radially in the flange portion 41 and opens onto the front and back surfaces of the flange portion 41. In other words, the discharge port 52 is formed to penetrate the flange portion 41 in the axial direction. In this embodiment, the discharge port 52 is not formed on the cylindrical portion 45, but is formed between the bottom surface 45a of the cylindrical portion 45 and the end surface 30a of the main body portion 30, extending from the inside of the cylindrical portion 45 to the outer circumferential surface 41a of the flange portion 41 (see Figure 4). A pair of notched surfaces 41b and 41c that demarcate the discharge port 52 are formed on the flange portion 41, each extending radially in the flange portion 41. When the cover portion 40 is attached to the main body portion 30, a portion of the end face 30a of the main body portion 30 is exposed by the discharge port 52, and a gap is formed between the end face 30a and the bottom surface 45a of the cylindrical portion 45 by the discharge port 52 (see Figures 2 and 4). In addition, multiple fastening holes (not shown) for fastening the fastening member 50 are formed in the flange portion 41, corresponding to the fastening holes 32 in the main body portion 30 of the housing 20.

[0025] The cylindrical portion 45 is formed concentrically with the flange portion 41. In an axial view, the inner region of the cylindrical portion 45 projectively overlaps with both the suction region where the pump chamber 13 expands and the discharge region where the pump chamber 13 contracts. Inside the cylindrical portion 45, a suction port 51 is formed corresponding to the suction region, and a partition portion 46 is formed separating the suction port 51 from the discharge region. An annular sealing member 60, such as an O-ring, is provided on the outer circumferential surface of the tip of the cylindrical portion 45.

[0026] Figure 4 is a cross-sectional view of the area around the pump section 10, showing the cross-section where the suction port 51 and discharge port 52 are formed. As shown in Figure 4, the suction port 51 is formed to communicate with the suction port 14a of the pump chamber 13a in the suction region (in other words, to overlap with the pump chamber 13a in the axial direction). The partition 46 is formed between the suction port 51 and the pump chamber 13b so that the inside of the cylindrical section 45 does not communicate with the discharge port 14b of the pump chamber 13b in the discharge region. As a result, the inside of the cylindrical section 45 becomes a suction space that communicates with the suction port 14a of the pump chamber 13a.

[0027] As shown in Figure 4, the discharge port 52 has one end that opens onto the outer circumferential surface 41a, the front surface, and the back surface of the flange portion 41, and the other end that communicates with the discharge port 14b of the pump chamber 13b (in other words, it overlaps with the pump chamber 13b in the axial direction). As a result, the discharge port 52 discharges the liquid supplied from the discharge port 14b to the outside through the space between the end face 30a of the main body portion 30 and the bottom surface 45a of the cylindrical portion 45. The liquid discharged from the discharge port 52 is guided by a pair of notched surfaces 41b and 41c that define the discharge port 52 and is led radially through the flange portion 41. Since the discharge port 52 is a notch formed using the thickness of the flange portion 41, the flow path cross-sectional area of ​​the discharge port 52 can be increased.

[0028] Thus, in the electric pump 100 of this embodiment, the cylindrical portion 45 is formed concentrically with the flange portion 41, and in an axial view, the area inside the cylindrical portion 45 overlaps projectively with both the suction region and the discharge region. Therefore, if the discharge port 52 were formed to overlap axially with the discharge port 14b of the pump chamber 13b, the discharge port 52 would be formed inside the cylindrical portion 45, requiring the discharge side and suction side to be separated inside the cylindrical portion 45. However, in the electric pump 100, as described above, the discharge port 52 opens onto the outer circumferential surface 41a of the flange portion 41, connecting the discharge port 14b to the outside. Thus, the electric pump 100 is not configured to separate the discharge side and suction side inside the cylindrical portion 45; rather, the inside of the cylindrical portion 45 becomes the suction side, and the outside of the cylindrical portion 45 becomes the discharge side. In other words, the discharge side and suction side are demarcated by the cylindrical portion 45.

[0029] Figure 5 is a side view showing the electric pump 100 attached to the mounting body 102, with the mounting body 102 shown in cross-section. The mounting body 102 is the case of equipment that utilizes the liquid discharged from the electric pump 100, and the equipment is, for example, a transmission or a transaxle device. The mounting body 102 has fastening holes (not shown) formed corresponding to the insertion holes 36 of the mounting flange 35 of the housing 20 of the electric pump 100 and into which a fixing member 70 is fastened, a housing recess 71 that accommodates a part of the main body 30 of the housing 20, a suction passage 72 formed in the center of the bottom surface of the housing recess 71 into which the cylindrical portion 45 of the cover portion 40 of the housing 20 is inserted, and a discharge passage 73 formed on the side surface of the housing recess 71. The suction passage 72 is a passage that guides liquid from the mounting body 102 to the pump section 10 of the electric pump 100, and the discharge passage 73 is a passage that guides liquid discharged from the pump section 10 of the electric pump 100 to the mounting body 102.

[0030] When attaching the electric pump 100 to the mounting body 102, the main body portion 30 of the housing 20 of the electric pump 100 is placed in the receiving recess 71 of the mounting body 102, and the mounting flange 35 of the housing 20 is brought into contact with the end face of the mounting body 102, while the cylindrical portion 45 of the cover portion 40 of the housing 20 is inserted into the suction passage 72 of the mounting body 102. Then, the fixing member 70 is inserted through the insertion hole 36 of the mounting flange 35 and fastened to the fastening hole of the mounting body 102. As a result, the mounting flange 35 is pressed against the end face of the mounting body 102, and the electric pump 100 is attached to the mounting body 102. With the electric pump 100 attached to the mounting body 102, a space 4 is formed between the cover portion 40 and the bottom surface of the receiving recess 71, connecting the discharge port 52 and the discharge passage 73, and the liquid discharged from the discharge port 52 is guided to the discharge passage 73 through the space 4. When the electric pump 100 is attached to the mounting body 102, it is preferable that the discharge port 52 of the electric pump 100 and the discharge passage 73 of the mounting body 102 face each other in the radial direction, as shown in Figure 5. This allows the liquid discharged from the discharge port 52 to flow radially and be guided to the discharge passage 73, thereby enabling a smooth supply of liquid to the discharge passage 73 facing the discharge port 52.

[0031] Thus, in the electric pump 100, the cylindrical portion 45, in which the suction port 51 is formed on the inside, is formed concentrically with the flange portion 41. Therefore, the cylindrical portion 45 can be fitted into the mounting body 102 regardless of the orientation (circumferential position) of the electric pump 100. In this embodiment, the cylindrical portion 45 can be fitted into the mounting body 102 regardless of the circumferential position of the fastening hole in the mounting body 102 for attaching the electric pump 100 by the fixing member 70, and the electric pump 100 can be easily attached. Furthermore, since high positional accuracy is not required for the cylindrical portion 45, the manufacturing of the cover portion 40 of the housing 20 is easy.

[0032] Furthermore, in the electric pump 100, the discharge port 52 is formed on the flange portion 41 and not on the cylindrical portion 45. This allows the cylindrical portion 45 to be made shorter in the axial direction compared to a configuration where the discharge port 52 is formed on the side surface of the cylindrical portion 45, thus making the electric pump 100 more compact in the axial direction. Moreover, in a configuration where the discharge port 52 is formed on the side surface of the cylindrical portion 45, a die is required to remove the discharge port 52 from the cylindrical portion 45 during the manufacturing of the cover portion 40. In contrast, in the electric pump 100 of this embodiment, a die is not required, making the manufacturing of the cover portion 40 easier.

[0033] According to the above embodiment, the following effects are achieved.

[0034] In the electric pump 100, the cylindrical portion 45, in which the suction port 51 is formed on the inside, is formed concentrically with the flange portion 41. Therefore, the cylindrical portion 45 can be fitted into the mounting body 102 regardless of the orientation of the electric pump 100, and the manufacturing of the cover portion 40 of the housing 20 is easy. Furthermore, even though the cylindrical portion 45 is formed concentrically with the flange portion 41, the discharge port 52 is formed to open on the outer peripheral surface 41a of the flange portion 41, which is outside the cylindrical portion 45. Thus, the discharge side and the suction side can be separated by the cylindrical portion 45.

[0035] Next, modifications of this embodiment will be described. The following modifications are also within the scope of the present invention, and it is possible to combine the configurations shown in the modifications with the configurations described in the above embodiments, or to combine the configurations described in the following different modifications.

[0036] <Example 1> In the above embodiment, a suction port 51 is formed inside the cylindrical portion 45, and a discharge port 52 is formed in the flange portion 41. However, the configuration is not limited to this; a discharge port 52 having the same shape as the suction port 51 in the above embodiment may be formed inside the cylindrical portion 45, and a suction port 51 having the same shape as the discharge port 52 in the above embodiment may be formed in the flange portion 41. In this case, the positions of the suction passage 72 and the discharge passage 73 of the mounted body 102 are swapped. In other words, one of the suction port 51 and the discharge port 52 is formed inside the cylindrical portion 45, and the other of the suction port 51 and the discharge port 52 is formed in the flange portion 41, opening onto the outer circumferential surface 41a of the flange portion 41. This configuration also provides the same effects as the above embodiment.

[0037] <Modification 2> In the electric pump 100 of the above embodiment, the discharge port 52 is not formed in the cylindrical portion 45, but extends radially from the flange portion 41 and opens to the front and back surfaces of the flange portion 41. However, the discharge port 52 is not limited to the above shape as long as it is formed to open to the outer circumferential surface 41a of the flange portion 41. For example, as in the electric pump 200 shown in Figure 6, the discharge port 152 may be configured to open to the outer circumferential surface of the cylindrical portion 45, as well as to the outer circumferential surface 41a and the front surface of the flange portion 41. In other words, the discharge port 52 may be formed without penetrating the flange portion 41 in the axial direction. Even with this configuration, the discharge port 152 is a radially formed notch and achieves the same effects as in the above embodiment.

[0038] <Variation 3> In the electric pump 100 of the above embodiment, the discharge port 52 is a notch formed radially in the flange portion 41. Therefore, the area around the discharge port 52 in the flange portion 41 has lower strength than other areas. Accordingly, as in the electric pump 300 shown in Figure 7, a bridge portion 254 may be formed at the boundary 47 between the cylindrical portion 45 and the flange portion 41, with the discharge port 52 spanning across the circumferential direction of the cylindrical portion 45, in order to reinforce the flange portion 41. The bridge portion 254 is connected to the surface of the flange portion 41 and the side surface of the cylindrical portion 45. In this configuration, the strength of the flange portion 41 can be improved by reinforcing the area around the discharge port 52, which has low strength in the flange portion 41, with the bridge portion 254.

[0039] <Modification 4> In the above embodiment, when the electric pump 100 is attached to the mounting body 102, it is preferable that the discharge port 52 of the electric pump 100 and the discharge passage 73 of the mounting body 102 face each other in the radial direction. However, the discharge port 52 and the discharge passage 73 do not have to face each other in the radial direction. In other words, the discharge port 52 and the discharge passage 73 may be offset in the circumferential direction of the cylindrical portion 45. Even with this configuration, the liquid discharged from the discharge port 52 flows through the space 4 in the circumferential direction of the cylindrical portion 45 and is guided to the discharge passage 73.

[0040] The configuration, operation, and effects of the embodiments of the present invention will be described below.

[0041] The electric pumps 100, 200, and 300 each include a motor unit 15 that drives a drive shaft 1, a pump unit 10 connected to the drive shaft 1 that discharges liquid, and a housing 20 that houses the motor unit 15 and the pump unit 10. The housing 20 has a main body 30 and a cover 40 attached to the main body 30 that covers the pump unit 10. The cover 40 has an annular flange 41 attached to the main body 30, a cylindrical 45 formed concentrically with the flange 41 and projecting axially from the flange 41, a suction port 51 that guides liquid to the pump unit 10, and discharge ports 52 and 152 that guide liquid discharged from the pump unit 10. One of the suction port 51 and the discharge ports 52 and 152 are formed inside the cylindrical 45, and the other of the suction port 51 and the discharge ports 52 and 152 are formed on the flange 41, opening onto the outer circumferential surface 41a of the flange 41.

[0042] In this configuration, the cylindrical portion 45, on which the suction port 51 and one of the discharge ports 52, 152 are formed, is formed concentrically with the flange portion 41. Therefore, the cylindrical portion 45 can be fitted into the mounting body 102 regardless of the orientation (circumferential position) of the electric pump 100, making it easy to install the electric pump 100 and also facilitating the manufacture of the cover portion 40 of the housing 20. Furthermore, even though the cylindrical portion 45 is formed concentrically with the flange portion 41, the discharge side and the suction side can be separated by the cylindrical portion 45, which is formed by opening the other of the suction port 51 and the outer peripheral surface 41a of the flange portion 41, which is outside the cylindrical portion 45.

[0043] Furthermore, in electric pumps 100, 200, and 300, the ports formed in the flange portion 41 are notches formed in the radial direction.

[0044] In this configuration, the liquid sucked in or discharged from the port formed in the flange portion 41 flows radially. Therefore, when the port and the flow paths of the mounted body 102 (suction passage 72, discharge passage 73) face each other radially, the liquid can be smoothly supplied to and discharged from the flow paths.

[0045] In addition, in the electric pump 300, a bridge portion 254 is formed at the boundary 47 between the cylindrical portion 45 and the flange portion 41, which spans the port formed in the flange portion 41 in the circumferential direction of the cylindrical portion 45.

[0046] In this configuration, the strength of the flange portion 41 can be improved by reinforcing the area around the port, where the strength of the flange portion 41 is low, with the bridge portion 254.

[0047] 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. [Explanation of Symbols]

[0048] 1…Drive shaft, 10…Pump section, 15…Motor section, 20…Housing, 30…Main body section, 40…Cover section, 41…Flange section, 41a…Outer surface, 45…Cylindrical section, 47…Boundary, 51…Suction port, 52…Discharge port, 100, 200, 300…Electric pump, 254…Bridge section

Claims

1. The motor unit that drives the drive shaft, A pump unit connected to the aforementioned drive shaft and discharging liquid, The system comprises a housing that accommodates the motor unit and the pump unit, The aforementioned housing is The main body and It has a cover portion that is attached to the main body portion and covers the pump portion, The aforementioned cover portion is An annular flange portion attached to the main body, A cylindrical portion is formed concentrically with the flange portion and protrudes axially from the flange portion, The pump section has a suction port for guiding liquid, It has a discharge port for guiding the liquid discharged from the pump section, One of the suction port and the discharge port is formed inside the cylindrical portion. An electric pump characterized in that the other of the suction port and the discharge port is formed on the outer circumferential surface of the flange portion.

2. An electric pump according to claim 1, An electric pump characterized in that the port formed in the flange portion is a notch formed in the radial direction.

3. The electric pump according to claim 2, An electric pump characterized in that a bridge portion is formed at the boundary between the cylindrical portion and the flange portion, extending across the port formed in the flange portion in the circumferential direction of the cylindrical portion.

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