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. The housing 20 has a main body 30 and a cover 40. 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 for guiding liquid to the pump unit 10, and a discharge port 52 for guiding liquid discharged from the pump unit 10. The flange 41 has a notch 42 formed in which a part of the outer edge is cut out over the entire axial length. One of the suction port 51 and the discharge port 52 is formed inside the cylindrical 45, and the other of the suction port 51 and the discharge port 52 is formed opening on the main body 30 side of the flange 41 and opens into the notch 42.

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 object to be attached, which takes time and effort to install the electric oil pump. In addition, since it has a special shape in which the cylindrical discharge port is provided offset from the center of the pump cover and the positional accuracy of the cylindrical discharge port is required, it is not easy to manufacture the pump cover.

[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. The flange unit has a notch formed in which a part of its outer periphery is cut out over the entire axial length. 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 opening to the main body side of the flange unit and opening to the notch.

[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 body 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 into a notch in the flange portion, which is on the outside of 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 flange portion comprises a flange body portion and a port-forming portion in which a port is formed, and the port-forming portion is formed to be more raised than the flange body portion on the surface of the flange portion opposite to the main body portion.

[0009] In this invention, the flange body is formed lower than the port-forming portion on the side of the flange opposite to the main body. Therefore, even if the port and the flow path of the mounted object do not face each other radially, the liquid sucked in or discharged from the port formed in the flange can easily flow circumferentially through the space between the flange body and the mounted object, thus enabling smooth supply and discharge of liquid into the flow path. [Effects of the Invention]

[0010] According to the present invention, an electric pump can be easily installed and easily manufactured. [Brief explanation of the drawing]

[0011] [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 plan view of the pump section of an electric pump according to an embodiment of the present invention, showing it attached to an object to be mounted. [Modes for carrying out the invention]

[0012] 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.

[0013] 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 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.

[0014] 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.

[0015] 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.

[0016] 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 such that its center is 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 the pump chambers 13 are defined by the adjacent external teeth 11a of the inner rotor 11 and the internal teeth 12a of the outer rotor 12. A plurality of pump chambers 13 are formed in the pump unit 10. In the present 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.

[0017] 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.

[0018] 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 (described later) of the housing 20, 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 (described later) of the housing 20.

[0019] As shown in FIGS. 1 to 3, the housing 20 has a main body portion 30 that houses the pump portion 10, the motor portion 15, and the control portion 17, and a cover portion 40 (see FIGS. 1 and 2) that is attached to the main body portion 30 and covers the pump portion 10. The main body portion 30 and the cover portion 40 are provided side by side in the axial direction of the drive shaft 1. On the outer peripheral surface of the region in the main body portion 30 that houses the motor portion 15, a pair of mounting flanges 35 (see FIGS. 1 and 5) for mounting the electric pump 100 to the attached body 102 are formed as will be described later. The mounting flange 35 is formed with insertion holes 36 (see FIG. 1) through which fixing members 70 (see FIG. 5) such as bolts are inserted.

[0020] As shown in FIG. 3, the main body portion 30 has an insertion hole (not shown) through which the drive shaft 1 is inserted and a pump housing recess 31 that houses the pump portion 10. The pump housing recess 31 is a recess with a circular bottom surface, and the inner rotor 11 and the outer rotor 12 of the pump portion 10 are housed eccentrically with respect to each other inside. Specifically, the center of the pump housing recess 31 coincides with the center of the outer rotor 12 and is formed offset from the center of the drive shaft 1. A plurality of fastening holes 32 for fastening fastening members 50 (see FIG. 2) such as bolts for attaching the cover portion 40 are formed in the end face 30a of the main body portion 30.

[0021] As shown in FIG. 2, the cover portion 40 is provided so as to cover the pump housing recess 31 in which the inner rotor 11 and the outer rotor 12 are housed. The cover portion 40 is attached to the end face 30a of the main body portion 30 by a fastening member 50. The cover portion 40 has an annular flange portion 41 attached to the end face 30a, a cylindrical portion 45 formed to project 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 the 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 hereinafter, the axial directions of both will be simply referred to as the "axial direction".

[0022] 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. A notch portion 42 is formed on the flange portion 41, in which a part of the outer peripheral edge is cut out along the entire axial direction. In this embodiment, the notch portion 42 is formed by cutting out a straight line in the tangential direction on the outer peripheral edge of the flange portion 41, and the end face 30a of the main body portion 30 is exposed by the notch portion 42. The discharge port 52 is formed to open on the surface of the flange portion 41 that is on the main body portion 30 side (the back surface of the flange portion 41) and opens into the notch portion 42 (see Figures 2 and 4). In other words, the discharge port 52 is formed without penetrating the flange portion 41 in the axial direction and opens into the back surface of the flange portion 41 and the notch portion 42. In this embodiment, the discharge port 52 is not formed in the cylindrical portion 45, but is formed radially in a groove shape between the bottom surface 45a of the cylindrical portion 45 and the end surface 30a of the main body portion 30 (see Figure 4). Thus, the flange portion 41 has a flange main body portion 41a and a port forming portion 41b in which the discharge port 52 is formed. The port forming portion 41b is formed on the surface of the flange portion 41 opposite to the main body portion 30 (the surface of the flange portion 41) and is raised higher than the flange main body portion 41a. In addition, the flange portion 41 has a plurality of fastening holes (not shown) in which the fastening member 50 is fastened, corresponding to the fastening holes 32 of the main body portion 30 of the housing 20.

[0023] 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.

[0024] 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.

[0025] As shown in Figure 4, the discharge port 52 has one end opening into the notch 42 and the other end communicating 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 gap between the end face 30a of the main body 30 and the bottom face 45a of the cylindrical part 45. The liquid discharged from the discharge port 52 is guided radially through the flange part 41. Since the discharge port 52 is formed using the thickness of the flange part 41, the cross-sectional area of ​​the flow path of the discharge port 52 can be increased.

[0026] As described above, 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 into a notch 42 formed in 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.

[0027] 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.

[0028] 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.

[0029] When the electric pump 100 is attached to the mounting body 102, the discharge port 52 of the electric pump 100 and the discharge passage 73 of the mounting body 102 may face each other radially, as shown in Figure 5, or they may not face each other, as shown in Figure 6. When the discharge port 52 and the discharge passage 73 face each other radially, as shown in Figure 5, the liquid discharged from the discharge port 52 flows radially and is guided to the discharge passage 73. Therefore, liquid can be smoothly supplied to the discharge passage 73 facing the discharge port 52. Also, when the discharge port 52 and the discharge passage 73 do not face each other radially, as shown in Figure 6, the liquid is first discharged radially from the discharge port 52 as shown by arrow A in Figure 6 and guided to the notch 42. On the surface of the flange portion 41, the flange body portion 41a is formed lower than the port forming portion 41b. In other words, because the height difference between the end face 30a of the main body 30 and the flange main body 41a is small, the liquid guided to the notch 42 can easily rise up the flange main body 41a, as shown by arrows B and C in Figure 6, and easily flow in the circumferential direction of the cylindrical portion 45 through the space 4. Therefore, the liquid can be smoothly supplied to the discharge passage 73.

[0030] If the flange portion 41 does not have a notch 42 and the discharge port 52 opens on the outer circumferential surface of the flange portion 41, then if the discharge port 52 and the discharge passage 73 are not facing each other in the radial direction, the liquid discharged from the discharge port 52 will be blocked by the inner circumferential surface of the housing recess 71 of the mounting body 102, and the liquid cannot be supplied to the discharge passage 73. In contrast, by forming the notch 42 in the flange portion 41 as described above, liquid can be supplied to the discharge passage 73 even if the discharge port 52 and the discharge passage 73 are not facing each other in the radial direction.

[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 into the notch portion 42 of the flange portion 41, which is on the outside of 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 embodiment 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 into the notch 42 of the flange portion 41. This configuration also provides the same effects as the above embodiment.

[0037] <Modification 2> In the above embodiment, the port forming portion 41b is formed on the surface of the flange portion 41 opposite to the main body portion 30 (the surface of the flange portion 41) and is raised higher than the flange main body portion 41a. This allows liquid to be smoothly supplied to the discharge passage 73 even when the discharge port 52 of the electric pump 100 and the discharge passage 73 of the mounting body 102 do not face each other in the radial direction. However, in cases where the discharge port 52 and the discharge passage 73 face each other in the radial direction, the port forming portion 41b does not need to be formed on the surface of the flange portion 41 and is raised higher than the flange main body portion 41a.

[0038] The configuration, operation, and effects of the embodiments of the present invention will be described below.

[0039] The electric pump 100 comprises a motor unit 15 that drives the 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 and is formed concentrically with the flange 41 and protrudes axially from the flange 41. The flange portion 41 has a cylindrical portion 45, a suction port 51 for guiding liquid to the pump portion 10, and a discharge port 52 for guiding liquid discharged from the pump portion 10. The flange portion 41 has a notch 42 formed in which a part of the outer edge is cut out along the entire axial direction. One of the suction port 51 and the discharge port 52 is formed on the inside of the cylindrical portion 45, and the other of the suction port 51 and the discharge port 52 is formed to open on the surface of the flange portion 41 facing the main body portion 30 and opens into the notch 42.

[0040] In this configuration, the cylindrical portion 45, which has one of the suction port 51 and the discharge port 52 formed on its 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, 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 other of the suction port 51 and the discharge port 52 is formed to open into the notch portion 42 of the flange portion 41, which is on the outside of the cylindrical portion 45, thus allowing the discharge side and the suction side to be separated by the cylindrical portion 45.

[0041] Furthermore, in the electric pump 100, the flange portion 41 has a flange body portion 41a and a port forming portion 41b in which a port is formed, and the port forming portion 41b is formed to be more raised than the flange body portion 41a on the side of the flange portion 41 opposite to the main body portion 30.

[0042] In this configuration, the flange body portion 41a is formed lower than the port forming portion 41b on the side of the flange portion 41 opposite to the main body portion 30. Therefore, even if the port and the flow path (discharge passage 73) of the mounted body 102 do not face each other in the radial direction, the liquid sucked in or discharged from the port formed in the flange portion 41 can easily flow circumferentially through the space 4 between the flange body portion 41a and the mounted body 102, thus enabling smooth supply and discharge of liquid into the flow path.

[0043] 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]

[0044] 1…Drive shaft, 10…Pump section, 15…Motor section, 20…Housing, 30…Main body section, 40…Cover section, 41…Flange section, 41a…Flange main body section, 41b…Port forming section, 42…Notch section, 45…Cylindrical section, 51…Suction port, 52…Discharge port, 100…Electric pump

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, The flange portion has a notch formed in which a part of the outer edge is cut out along the entire axial direction. One of the suction port and the discharge port is formed on the inside of the cylindrical portion. The other of the suction port and the discharge port is formed to open to the main body side of the flange portion and to open to the notch portion, characterized in that it is an electric pump.

2. An electric pump according to claim 1, The flange portion comprises a flange body portion and a port forming portion in which the port is formed. The port forming portion is characterized in that it is formed on the side of the flange portion opposite to the main body portion, and is raised higher than the flange main body portion.

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