electric pump

Abstract

The present invention provides an electric pump comprising: a housing; a gear portion disposed within the housing; a stator configured to correspond to the gear portion; and a support member disposed between the gear portion and the housing, wherein the gear portion includes a first gear, a second gear configured to correspond to the first gear, and a magnet disposed within the second gear, and the support member includes a first region supporting the first gear and a second region protruding from the first region and inserted into the first gear.

Description

Technical Field

[0001] This invention relates to electric pumps. Background Technology

[0002] An electric hydraulic pump (EOP) is used to discharge fluid at a predetermined pressure. Such a pump includes a housing, a gear section housed within the housing, and a motor that drives the gear section. However, conventional electric hydraulic pumps suffer from the problem that the gear section and motor section are mechanically separated, thus increasing their axial length.

[0003] Furthermore, because the housing is made of plastic, it is susceptible to thermal deformation due to heat generated from the gear section during operation. This results in reduced efficiency of the electric oil pump due to gaps between the housing and the gear section, or errors between the axial centers of the multiple gears included in the gear section. Summary of the Invention

[0004] Technical issues

[0005] The present invention aims to provide an oil pump in which the housing is miniaturized, the axial clearance of the gear portion caused by thermal deformation of the housing is prevented, and the gear portion is stably driven.

[0006] Technical solutions

[0007] One aspect of the present invention provides an electric pump comprising: a housing; a gear portion disposed within the housing; a stator configured to correspond to the gear portion; and a support member disposed between the gear portion and the housing, wherein the gear portion includes a first gear, a second gear configured to correspond to the first gear, and a magnet disposed on the second gear, and the support member includes a first region supporting the first gear and a second region protruding from the first region and inserted into the first gear.

[0008] The second area can pass through the first gear.

[0009] Another aspect of the present invention provides an electric pump comprising: a housing; a gear portion disposed within the housing; a stator configured to correspond to the gear portion; a cover disposed above the gear portion; and a support member disposed below the gear portion, wherein the support member includes a second region extending axially through the gear portion and connected to the cover.

[0010] The housing can be attached to the cover.

[0011] The housing may include a lower surface that supports the gear portion and the support members, and sidewalls extending upward from the lower surface.

[0012] Another aspect of the present invention provides an electric pump comprising: a molded member; a gear portion disposed in the molded member; a stator configured to correspond to the gear portion; and a support member disposed between the gear portion and the molded member and formed of a metallic material, wherein the gear portion includes a first gear, a second gear configured to correspond to the first gear, and a magnet disposed on the second gear, and at least a portion of the support member is disposed between a lower surface of the gear portion and a surface of the molded member.

[0013] The stator can be embedded in a molded component.

[0014] The molded component may include a receiving portion, in which the gear portion is disposed, and the upper surface of the molded component may be disposed at a level higher than the upper end of the stator.

[0015] The electric pump may include a cover disposed above the gear portion, wherein at least a portion of the cover may be disposed within a receiving portion.

[0016] Another aspect of the present invention provides an electric pump comprising: a housing; a gear portion disposed within the housing; a drive portion driving the gear portion; and a support member disposed between the gear portion and the housing, wherein the gear portion includes a first gear and a second gear, the second gear rotating corresponding to the first gear, the drive portion includes a magnet disposed on the second gear and a coil disposed corresponding to the magnet, and the support member includes a first region connected to the housing and a second region fixed to the first gear.

[0017] The housing may include a receiving portion in which the gear portion is disposed.

[0018] Support components may include aluminum.

[0019] One area of ​​the support member can pass through the gear portion in the axial direction, and another area can support the gear portion in the axial direction.

[0020] The upper end of the support member can be positioned at a level higher than the upper surface of the gear section.

[0021] The maximum diameter of the support component can be greater than or equal to the outer diameter of the gear section.

[0022] A through hole may be formed in the gear part, a support member may be disposed in the through hole, and a protruding portion protruding toward the axial center may be formed in the inner circumferential surface in which the through hole is formed.

[0023] The support member may include a side surface that faces the inner circumferential surface of the gear portion in the radial direction, and a portion of the side surface of the support member may contact the protrusion and another portion may be spaced apart from the inner circumferential surface of the gear portion.

[0024] Beneficial effects

[0025] According to the present invention, the electric pump can be stably driven in such a way as to prevent the clearance in the axial direction of the gear portion caused by thermal deformation of the housing, and to reduce the error between the axial centers of the gears included in the gear portion.

[0026] According to the present invention, a separate motor section can be omitted by using the electrical interaction between the gear section and the stator to provide the power required for pumping oil. Therefore, the axial length of the electric pump can be reduced, and thus the electric pump can be miniaturized. Attached Figure Description

[0027] Figure 1 This is a schematic cross-sectional view of an electric pump according to one embodiment of the present invention.

[0028] Figure 2 This is a schematic cross-sectional view illustrating an electric pump according to another embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional view of an electric pump according to another embodiment of the present invention.

[0030] Figure 4 This is an exploded perspective view of an electric pump according to another embodiment of the present invention.

[0031] Figure 5 It is a three-dimensional cross-sectional view illustrating the cross-section of the molded component and the stator.

[0032] Figure 6 It is a three-dimensional diagram showing the gear assembly and support components connected together.

[0033] Figure 7 It is an exploded perspective view showing the first gear, the second gear, and the supporting components.

[0034] Figure 8 It is a plan view illustrating the connection between the gear assembly and the support components.

[0035] Figure 9 It is a three-dimensional diagram of the supporting components.

[0036] Figure 10 It is a plan view of the supporting components.

[0037] Figure 11 This is a side view of the supporting component.

[0038] Figure 12 It's a diagram. Figure 11 A magnified view of a portion of the image.

[0039] Figure 13 It is a plan view illustrating the connection between the first gear and the support member.

[0040] Figure 14 It's a diagram. Figure 3 The figure shows a partial cross-sectional view of the electric pump.

[0041] Figure 15 It is a graph showing the comparison between an example and a comparative example of oil flow rate versus oil pressure. Detailed Implementation

[0042] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] The direction parallel to the axis of rotation, which is the center of rotation of the gear part, is called the axial direction. The direction perpendicular to the axial direction is called the radial direction relative to the axis of rotation. And the direction along the following circle is called the circumferential direction: the circle has a radius in the radial direction starting from the center of the axial direction.

[0044] Figure 1 This is a schematic cross-sectional view of an electric pump according to one embodiment of the present invention.

[0045] Reference Figure 1 The electric pump 10 includes a housing 110, a gear part 120, a stator 130, a support member 140, a cover 150, and a power supply 160.

[0046] The housing 110 and the cover 150 can form the exterior of the electric pump 10. The stator 130 and the gear portion 120 can be disposed within the housing 110. The housing 110 can be formed of resin or plastic material.

[0047] The housing 110 may include a lower surface 111 and a sidewall 112. In this case, the lower surface 111 may support the stator 130 and the gear portion 120 in the axial direction. Additionally, the sidewall 112 may surround the outer side of the stator 130. In this case, the gear portion 120 may be disposed inside the stator 130.

[0048] The gear section 120 rotates through electrical interaction with the stator 130. The gear section 120 may be configured to correspond to the stator 130 and is disposed inside the stator 130. The gear section 120 is used to pump fluid and provide the power required for pumping.

[0049] The stator 130 is configured to correspond to the gear portion 120. A coil for generating a rotating magnetic field is wound around the stator 130 to cause an electrical interaction with the gear portion 120, thereby causing the gear portion 120 to rotate.

[0050] A support member 140 may be disposed between the gear portion 120 and the housing 110. In this case, the support member 140 may be fixed to the lower surface 101. Additionally, an end portion of the support member 140 may pass through the gear portion 120 and be connected to the cover 150. The support member 140 may be formed of a metallic material. The support member 140 may rub against the lower surface of the gear portion 120 when the gear portion 120 rotates. The support member 140 may reduce friction in the rotational direction of the gear portion 120 and prevent backlash in the gear portion 120 in the axial direction. Furthermore, one side of the support member 140 may pass through the gear portion 120 in the axial direction to fix the rotational center of the gear portion 120.

[0051] Cover 150 may be disposed above gear portion 120. Cover 150 may be coupled to housing 110. Cover 150 may be formed of a metallic material. In this case, cover 150 may be formed of the same material as support member 140. Cover 150 may include aluminum.

[0052] The power supply 160 may be located on one side of the housing 110. Additionally, the power supply 160 may be electrically connected to the stator 130 to supply current to the stator 130. The power supply 160 may include a printed circuit board and electronic components mounted on that printed circuit board.

[0053] Figure 2 This is a schematic cross-sectional view illustrating an electric pump according to another embodiment of the present invention. Figure 3 The illustration shows a cross-sectional view of an electric pump according to another embodiment of the present invention, and Figure 4 This is an exploded perspective view of an electric pump according to another embodiment of the present invention.

[0054] Reference Figures 2 to 4 The electric pump 20 may include a molded component 210, a gear portion 220, a stator 230, a support component 240, a cover 250, and a power supply 260.

[0055] The molded component 210 covers the stator 230. In this case, the molded component 210 can be injection molded into the stator 230. Additionally, the molded component 210 may include a receiving portion. A gear portion 220 is disposed in this receiving portion. The receiving portion may have a cylindrical shape. The diameter of the receiving portion may be larger than the outer diameter of the gear portion 220.

[0056] The gear portion 220 can be disposed within the receiving portion of the molding member 210. Furthermore, the gear portion 220 may include a first gear 221, a second gear 222, and a magnet 223. The second gear 222 is disposed outside the first gear 221. Additionally, the magnet 223 may be disposed on the outer peripheral surface of the second gear 222. Multiple magnets 223 may be provided. The magnets 223 may be arranged in the circumferential direction.

[0057] The stator 230 is disposed in the molded member 210. Furthermore, the stator 230 is configured to correspond to the gear portion 220. The stator 230 is electrically connected to the power supply 260, and when current is supplied from the power supply 260, it can induce an electrical interaction with the magnet 223.

[0058] A support member 240 is disposed between the gear portion 220 and the molding member 210. One surface of the support member 240 contacts the molding member 210. In this case, one surface of the support member 240 can be fixed to the molding member 210. The end portion of the support member 240 can pass through the gear portion 220. Additionally, the end portion of the support member 240 can be connected to the cover member 250. The support member 240 can be formed of a metallic material. When the gear portion 220 is driven by the electrical interaction between the stator 230 and the gear portion 220, the support member 240 can slide relative to the gear portion 220. The support member 240 is formed of a metallic material and has excellent sliding characteristics relative to the gear portion 220. Furthermore, axial clearance between the gear portion 220 and the molding member 210 can be prevented. Additionally, the support member 240 fixes the rotation center of the gear portion 220, and therefore the gear portion 220 can be driven more stably.

[0059] Cover 250 may be disposed above gear portion 220 and coupled to the upper end of molded member 210. Cover 250 may be formed of metallic material. Cover 250 may include an intake port (not shown) and an exhaust port (not shown). The intake port (not shown) and exhaust port (not shown) may guide fluid to be smoothly drawn in and discharged by gear portion 220.

[0060] The power supply 260 may be located on one side of the molded component 210. Additionally, the power supply 260 may be electrically connected to the stator 230 to supply current to the stator 230. The power supply 260 may include a printed circuit board and electronic components mounted on the printed circuit board.

[0061] Figure 5 It is a three-dimensional cross-sectional view illustrating the cross-section of the molded component and the stator.

[0062] Reference Figure 5The stator 230 may include a stator core 231, a coil 232 wound around the stator core 231, and an insulator 233 disposed between the stator core 231 and the coil 232. In this case, the coil 232 may be connected to a power supply 260. The stator 230 is embedded in a molded member 210.

[0063] The molded component 210 may cover the stator core 231, coil 232, and insulator 233. In this case, the molded component 210 may be injection-fitted to the stator 230. Insertion injection may be used as the injection method. In this case, the molded component 210 may be formed of resin or plastic material. For example, the molded component 210 may be formed of thermally conductive plastic material. Thermally conductive plastic materials may include particulate resin, heat-dissipating resin, polyphthalamide (PPA) resin, carbon nanotubes (CNTs), etc.

[0064] The cover 250 can be disposed on the upper surface 210A of the molding member 210. In this case, the upper surface 210A of the molding member 210 can be disposed at a level higher than the upper end of the stator 230. Furthermore, at least one fastening hole 210H can be formed in the upper surface 210A of the molding member 210. Additionally, threads for connection with a fastening member can be formed in the fastening hole 210H. In this case, the fastening hole 210H can be connected to the cover 250 via a fastening member.

[0065] The molding component 210 can form a receiving portion S. A gear portion 220 can be disposed within the receiving portion S. The receiving portion S can have a cylindrical shape. The axial length of the receiving portion S can be greater than the axial length of the gear portion 220. Furthermore, the diameter of the receiving portion S can be greater than the outer diameter of the gear portion 220.

[0066] In addition, the upper part of the accommodating part S can be closed by the cover 250.

[0067] The edge of the cover 250 is connected to the upper surface 210A of the molded member 210. The central portion of the cover 250 may protrude toward the gear portion 220 and is disposed in the receiving portion S. In this case, the central portion of the cover 250 can fix the upper end of the gear portion 220. In addition, the receiving portion S may be connected to the suction port (not shown) and the discharge port (not shown) of the cover 250. In this case, the suction port (not shown) and the discharge port (not shown) may be spatially separated.

[0068] Figure 6 It is a perspective view illustrating the connection between the gear assembly and the supporting components. Figure 7 It is an exploded perspective view illustrating the first gear, the second gear, and the supporting components, and Figure 8It is a plan view illustrating the connection between the gear assembly and the support components.

[0069] Although for ease of description, reference has been made Figure 3 The gear portion 220 and support member 240 illustrated in the figure illustrate this embodiment, but the shape and function of the gear portion 220 and support member 240 described in this embodiment can also be applied to other embodiments. Figure 1 and Figure 6 The gear portion 120 and the support member 140 are shown.

[0070] Reference Figure 6 The support member 240 supports the gear portion 220 in the axial direction. Furthermore, the support member 240 can pass through the gear portion 220 and fix the rotation center of the gear portion 220. For this purpose, the support member 240 may include a first region 241 and a second region 242.

[0071] The first region 241 is disposed below the gear portion 220. In this case, the first region 241 can support the lower surface of the gear portion 220. Additionally, the first region 241 can be fixed to the molding member 210. The first region 241 can have a disc-shaped shape. The diameter D2 of the first region 241 can be greater than or equal to the outer diameter D1 of the gear portion 220. Meanwhile, although not shown in the figure, the diameter of the first region can be smaller than the outer diameter of the gear portion, and the edge of the gear portion can be spaced apart from the molding member.

[0072] The second region 242 may protrude from the first region 241. The second region 242 may pass through the first gear 221. In this case, the second region 242 may be located at the rotation center of the first gear 221. The second region 242 may be a cylindrical member extending in the axial direction. In this case, the diameter of the second region 242 may be smaller than the diameter of the inner circumferential surface of the first gear 221.

[0073] Reference Figure 7 The first gear 221 can be disposed inside the second gear 222, and the second region 242 can be disposed inside the first gear 221. The second region 242 can pass through the first gear 221 in the axial direction. In this case, the length of the second region 242 in the axial direction can be greater than the length of the gear portion 220 in the axial direction. The end portion of the second region 242 can be disposed at a level higher than the upper surface of the first gear 221. In addition, the end portion of the second region 242 can be connected to the cover 250.

[0074] Reference Figure 8N outward protrusions 2211 can be formed on the first gear 221 in the circumferential direction, facing outwards radially from the axial center. Simultaneously, N+1 inward protrusions 2221 can be formed on the second gear 222, facing inwards radially. In this case, the outward protrusions 2211 can be locked by the inward protrusions 2221. When the first gear 221 rotates, the second gear 222 rotates at a rotation ratio of (N+1) / N. The gear portion 220 has a predetermined eccentric structure when the first gear 221 rotates. Due to this eccentricity, a space is formed between the first gear 221 and the second gear 222 through which fluid (oil) flows. That is, during the rotational movement of the first gear 221, the portion with increased volume draws in surrounding fluid due to decreased pressure, and the portion with decreased volume discharges fluid due to increased pressure.

[0075] The gear section 220 interacts electrically with the stator 330 to pump oil and also provides the power required for pumping. Therefore, in the electric pump according to the invention, the axial length can be reduced by omitting a separate motor section.

[0076] Figure 9 It shows a three-dimensional view of the supporting components, and Figure 10 It is a plan view of the supporting components. Figure 11 The illustration shows a side view of the supporting member, and Figure 12 It's a diagram. Figure 11 A magnified view of a portion of the image.

[0077] Reference Figure 9 The support member 240 may include a first region 241 and a second region 242 projecting upward from the upper surface of the first region 241. In this case, the first region 241 and the second region 242 may be integrally formed. The support member 240 may include aluminum. In this case, the cover 250 may be formed of the same material as the support member 240.

[0078] The first region 241 may include a first surface 241A and a second surface 241B. The first surface 241A and the second surface 241B may be arranged in the axial direction. In this case, the first surface 241A is arranged facing the gear portion 220. Additionally, the second surface 241B is arranged facing the molding member 210. The first surface 241A contacts the gear portion 220, and the second surface 241B contacts the molding member 210. In this case, when the gear portion 220 rotates, the contact portion between the first surface 241A and the gear portion 220 may be rubbed. The diameter D2 of the first region 241 may be greater than or equal to the outer diameter of the gear portion 220.

[0079] The first region 241 may have a disc-shaped shape. In this case, the first region 241 may have a first thickness T1 in the axial direction. In this case, the first thickness T1 may be equal to the following value: this value is obtained by subtracting the length of the gear portion 220 in the axial direction from the distance between the cover 250 and the molding member 210 disposed in the receiving portion S. In this case, the height of the gear portion 220 in the axial direction can be adjusted according to the first thickness T1 of the first region 241. In addition, the gap between the molding member 210, the gear portion 220 and the cover 250 disposed in the axial direction can be prevented by adjusting the first thickness T1 of the first region 241.

[0080] The second region 242 extends from the first region 241. The second region 242 may be disposed on the first surface 241A. The second region 242 may be disposed off-center relative to the center of the first surface 241A. The shortest distance from a point P1 on the edge of the first surface 241A to the second region 242 may be different from the shortest distance from another point P2 on the edge of the upper surface of the first region 241 to the second region 242.

[0081] The second region 242 may include a first portion 2421 and a second portion 2422. The first portion 2421 may extend from the first region 241. The first portion 2421 may be disposed inside the first gear 221. In this case, the diameter D3 of the first portion 2421 may be less than or equal to the diameter of the inner circumferential surface of the first gear 221. As described above, the first portion 2421 may be disposed at the axis of rotation, which is the center of rotation of the first gear 221, to support the radial movement of the gear portion 220.

[0082] The second portion 2422 can extend from the end portion of the first portion 2421. The second portion 2422 can be disposed above the upper surface of the first gear 221. Furthermore, the second portion 2422 can be connected to the cover 250. In this case, a groove corresponding to the shape of the second portion 2422 can be formed in the cover 250, and the second portion 2422 can be disposed in the groove. The diameter D4 of the second portion 2422 can be smaller than the diameter D3 of the first portion 2421. According to this embodiment, the ratio of the diameter of the second portion 2422 to the diameter D3 of the first portion 2421 can be in the range of 0.5 to 0.8. The support member 240 can support the radial movement of the gear portion 220 while the gear portion 220 is driven, and the support member 240 can be connected to the cover 250 to increase the fixing force.

[0083] The length L of the second region 242 in the axial direction is equal to the sum of the lengths of the first portion 2421 and the second portion 2422 in the axial direction. In this case, the first portion 2421 may have a first length L1 in the axial direction, and the second portion 2422 may have a second length L2 in the axial direction. In this case, the first length L1 may be greater than the second length L2. According to this embodiment, the ratio of the second length L2 to the first length L1 may be in the range of 0.15 to 0.4.

[0084] Meanwhile, according to another embodiment of the present invention, although not shown in the figures, the length L of the second region 242 may be less than the axial length of the gear portion 220. In this case, the upper end of the second region 242 may be positioned at a level lower than the upper surface of the gear portion 220. Furthermore, the upper end of the second region 242 may be spaced apart from the cover 250.

[0085] Reference Figure 12 The upper edge of the first portion 2421 may be tapered. Additionally, the upper edge of the second portion 2422 may be tapered. Furthermore, the second region 242 may include a stepped portion 2423 connecting the first portion 2421 and the second portion 2422.

[0086] Figure 13 It is a plan view illustrating the connection between the first gear and the support member.

[0087] Reference Figure 13 The first gear 221 may have a first width W, which is the minimum width in the radial direction. In this case, the first width W may be the shortest distance between the inner diameter of the first gear 221 and the root circle of the first gear 221. The first width W1 may be smaller than the diameter D3 of the first portion 2421. For example, the first width W1 may be in the range of 2 mm to 4.5 mm, and the diameter D3 of the first portion 2421 may be in the range of 4.5 mm to 6.5 mm. In this case, the first width W1 and the diameter D3 of the first portion 2421 may vary depending on the size of the electric pump. The ratio of the first width W1 to the diameter D3 of the first portion 2421 may be in the range of 0.3 to 1. In this case, when the ratio of the first width W1 to the diameter D3 of the first portion 2421 decreases, the mechanical strength of the first gear 221 may decrease. Conversely, when the ratio of the first width W1 to the diameter D3 of the first portion 2421 increases, the diameter of the first portion 2421 may not be sufficiently secured, and therefore the mechanical strength of the support member 240 may decrease.

[0088] Figure 14 It's a diagram. Figure 3The figure shows a partial cross-sectional view of the electric pump.

[0089] The support member 240 has a lower surface and an upper surface facing the cover member 250. Additionally, a through hole 221H can be formed in the first gear 221, passing through both the upper and lower surfaces. In this case, a rotation axis RA can be provided in the through hole 221H, which serves as the center of rotational movement of the first gear 221. Furthermore, a first portion 2421 can be provided in the through hole 221H. In this case, the first portion 2421 can include a side surface 2421A facing the inner circumferential surface of the first gear 221. The diameter of the through hole 221H can be larger than the diameter of the first portion 2421, and therefore the side surface 2421A can be spaced apart from the inner circumferential surface of the first gear 221.

[0090] The first gear 221 may include a protruding portion 2212 projecting toward the axis of rotation RA. The protruding portion 2212 may be disposed on the inner circumferential surface of the first gear 221. In this case, the protruding portion 2212 may include a protruding surface 221A that contacts the side surface 2421A of the first portion 2421.

[0091] The side surface 2421A of the first part 2421 may include the first part 2421A1, the second part 2421A2 and the third part 2421A3.

[0092] The first portion 2421A1 can contact the protruding surface 221A. The first portion 2421A1 can be spaced apart from the first region 241. Furthermore, the second portion 2421A2 can be disposed between the first region 241 and the first portion 2421A1. In this case, the second portion 2421A2 can be spaced apart from the first gear 221. The second portion 2421A2 can have a longer length in the axial direction than the first portion 2421A1. Additionally, the third portion 2421A3 can be disposed between the first portion 2421A1 and the second portion 2422. In this case, the third portion 2421A3 can be spaced apart from the first gear 221. Meanwhile, the cover 250 can include a protrusion 251 protruding between the third portion 2421A3 and the first gear 221. Furthermore, a groove 250G can be formed inside the protrusion 251 in the cover 250. In this case, the second portion 2422 can be disposed in the groove 250G. The length of the groove 250G in the axial direction can be greater than the length of the second part 2422 in the axial direction. In this case, the upper end of the second part 2422 can be spaced apart from the cover 250.

[0093] The cover 250 may include a seating surface 250A disposed between the recess 250G and the protrusion 251. In this case, the seating surface 250A may contact the stepped portion 2423. As described above, the cover 250 may include a structure for being fixedly connected to the support member 240 to increase the fixing force of the support member 240.

[0094] Figure 15 It is a graph showing the comparison between an example and a comparative example of oil flow rate versus oil pressure.

[0095] exist Figure 15 In the example, the change in oil flow rate relative to oil pressure of the following electric pump is measured: This electric pump is compared with... Figure 3 The structure is similar, including a housing, gear section, stator, support members, and cover. An example electric pump has the following structure: in this structure, power is generated through the gear section, and oil is pumped from the gear section.

[0096] In Comparative Example 1, the change in oil flow rate relative to oil pressure of a conventional electric pump was measured, in which the motor section and the pump section are mechanically separated. The electric pump of Comparative Example 1 has a structure in which power generated in the motor section is transmitted to the pump section to operate the pump section.

[0097] In Comparative Example 2, the change in oil flow rate relative to oil pressure of the following electric pump was measured: (The following is omitted in the original text: ...) Figure 3 The supporting components in the structure. In this case, except that the supporting components are omitted, the electric pump of Comparative Example 2 can have the same configuration as the electric pump used in the example.

[0098] Reference Figure 15 As can be seen, in Comparative Example 2, compared to Comparative Example 1, the oil flow rate decreases rapidly with increasing oil pressure. Therefore, it can be seen that in the electric pump of Comparative Example 2, compared to a conventional electric pump where the motor and pump sections are mechanically separated, the oil flow rate decreases rapidly with increasing oil pressure. Therefore, it can be seen that although an electric pump including a gear section (serving as a motor section) and a pump section can reduce the axial length, hydraulic losses occur due to the axial clearance between the gear section and the housing.

[0099] Conversely, in the example, it can be seen that, compared to Comparative Example 2, the decrease in oil flow rate is relatively small even when the oil pressure increases. In this case, it can be seen that the flow rate reduction in the example is similar to that in Comparative Example 1. That is, it can be seen that, although the example has a structure similar to that of Comparative Example 2, there is no significant difference in oil pumping performance between the example and Comparative Example 1. As described above, in the electric pump according to the invention, the dimensions can be minimized by reducing the length in the axial direction, and the oil pumping performance can be maintained by preventing axial clearance between the gear portion and the housing.

[0100] Examples of implementations using electric pumps have been described, but are not limited thereto. These implementations can be used in various devices, such as vehicles or household appliances.

Claims

1. An electric pump, comprising: Molded components; A gear portion, wherein the gear portion is disposed in the molded component; A stator, the stator being configured to correspond to the gear portion; as well as A support member is disposed between the gear portion and the molded member. The gear section includes a first gear, a second gear corresponding to the first gear, and a magnet disposed on the second gear. The support member includes a first region supporting the first gear and a second region protruding from the first region and inserted into the first gear, wherein the first region and the second region are integrally formed. The first region is positioned axially between the first gear and the molding component, and the first region is in contact with both the first gear and the molding component.

2. The electric pump according to claim 1, wherein, The second region passes through the first gear.

3. The electric pump according to claim 1, further comprising a cover disposed above the gear portion; and in, The second region passes through the gear portion in the axial direction and is connected to the cover.

4. The electric pump according to claim 3, wherein, The molded component is connected to the cover.

5. The electric pump according to claim 4, wherein, The molded component includes: The lower surface supports the gear portion and the support member; and Sidewalls that extend upward from the lower surface.

6. The electric pump according to claim 1, wherein, The stator is embedded in the molded component.

7. The electric pump according to claim 1, wherein: The molded component includes a receiving portion, and the gear portion is disposed within the receiving portion; and The upper surface of the molded component is positioned at a level higher than the upper end of the stator.

8. The electric pump of claim 7, further comprising a cover disposed above the gear portion. in, At least a portion of the cover is disposed in the receiving portion.

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