pump

Abstract

A pump according to an example embodiment of the present invention includes a housing, a stator disposed in a space in the housing, an external gear disposed in the stator, and an internal gear disposed in the external gear, wherein a bottom surface of the space in the housing is provided with a protrusion protruding upward from the external gear, and an upper surface of the protrusion is formed with a recess protruding downward from the external gear.

Description

Technical Field

[0001] The teachings of exemplary and non-limiting embodiments of the present invention generally relate to pumps. Background Technology

[0002] A pump consists of a motor area that generates rotary driving force and a pump area that generates hydraulic pressure. Therefore, the motor area and pump area within the pump are separated, increasing the number of required components and the overall product size.

[0003] Typically, an EOP (External Operating Panel) may include: a housing; a stator disposed within the housing; and an external gear and an internal gear disposed within the stator. The external gear may have its arrangement area defined by a can disposed between the stator and the housing, and the internal gear may have its arrangement area defined by a cover connected to the housing.

[0004] The external gear comprises a core and a magnet disposed on the outer surface of the core. Therefore, the external gear rotates through the electromagnetic interaction between the coils in the stator and the magnet. The outer surface of the core in the external gear has a magnet connection portion for connecting the magnet; however, due to the unnecessary areas such as the magnet connection portion created on the outer surface of the core through shaping, friction occurs between the housing and the external gear, and between the housing and the cover, thus significantly reducing the pump's efficiency.

[0005] Furthermore, pumps based on existing technology are not equipped with sensing devices for detecting the temperature of fluids such as oil in the pump, making it difficult to accurately detect the temperature of the fluid in the pump, which is a disadvantage. Summary of the Invention

[0006] Technical topics

[0007] The present invention provides a pump that can improve drive efficiency by reducing the frictional torque caused by the rotation of the external gear.

[0008] Furthermore, the present invention provides a pump that can accurately detect the temperature of the fluid in the pump by incorporating a temperature sensor within the pump.

[0009] Technical solutions

[0010] A pump according to an exemplary embodiment of the present invention may include: a housing; a stator disposed in a space within the housing; an external gear disposed in the stator; and an internal gear disposed within the external gear, wherein the bottom surface of the space within the housing is provided with a protrusion projecting upward from the external gear, and the upper surface of the protrusion is formed with a recess projecting downward from the external gear.

[0011] Preferably, but not necessarily, the external gear may include a core, a plurality of magnets connected to the side of the core, and the recess may be configured to overlap with the core or magnets in the upward and downward directions.

[0012] Preferably, but not necessarily, the recess can form the edge of the protrusion.

[0013] Preferably, but not necessarily, a second hole may be formed in the center of the internal gear, and the pump may include a shaft that protrudes upward from the upper surface of the protrusion and engages with the second hole.

[0014] Preferably, but not necessarily, the recess may include a bottom surface and a side portion, the bottom surface being provided in a stepped manner downward from the upper surface of the protrusion, and the side portion connecting the upper surface of the protrusion to the bottom surface, the side portion being formed to be inclined outward, thereby increasing the distance to the center of the protrusion.

[0015] Preferably, but not necessarily, the diameter B of the area on the upper surface of the protrusion, excluding the area formed by the recess, can correspond to the diameter of the anti-friction area of ​​the external gear, wherein the anti-friction area of ​​the external gear can be the area defined by an imaginary circle connecting the circumferential centers of the magnets on the lower surface of the external gear.

[0016] Preferably, but not necessarily, the axial length of the recess can be at least 0.1 mm and no more than 0.5 mm.

[0017] Preferably, but not necessarily, the radial length F of the recess can be less than the radial thickness of the magnet.

[0018] Preferably, but not necessarily, the upper surface of the protrusion may be formed with a third opening for fluid entry and a fourth opening for fluid exit.

[0019] Preferably, but not necessarily, the outer surface of the magnet can protrude outward from the outer surface of the core.

[0020] Advantages of the invention

[0021] The exemplary embodiments of the present invention have the following advantages: a torque reduction structure is achieved, which has a recess on the protrusion facing the external gear in the axial direction, thereby preventing frictional torque generated between the external gear and the housing due to the rotation of the external gear.

[0022] Furthermore, by placing a temperature sensor in the fluid flow space within the pump, the temperature of the operating fluid can be detected more accurately. Attached Figure Description

[0023] Figure 1 This is a perspective view illustrating the appearance of a pump according to an exemplary embodiment of the present invention.

[0024] Figure 2This is a perspective view showing the exterior of a pump according to an exemplary embodiment of the present invention from different angles.

[0025] Figure 3 This is a plan view showing a side view of a pump according to an exemplary embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of a pump according to an exemplary embodiment of the present invention.

[0027] Figure 5 This is an exploded perspective view of a pump according to an exemplary embodiment of the present invention.

[0028] Figure 6 This is an exploded perspective view of the housing and external gear according to an exemplary embodiment of the present invention.

[0029] Figure 7 This is a cross-sectional view showing the connection structure of the housing and the external gear according to an exemplary embodiment of the present invention.

[0030] Figure 8 This is a perspective view of an external gear according to an exemplary embodiment of the present invention.

[0031] Figure 9 This is a perspective view showing the upper surface of a protrusion in a housing according to an exemplary embodiment of the present invention.

[0032] Figure 10 This is a cross-sectional view illustrating a temperature sensing structure in a pump according to an exemplary embodiment of the present invention. Detailed Implementation

[0033] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] However, the present invention is not limited to the given exemplary embodiments described, but can be implemented in various different forms, and within the scope of the present invention, one or more components in the exemplary embodiments may be optionally combined or substituted between embodiments.

[0035] Furthermore, unless explicitly defined and described, the terms (including technical and scientific terms) used in the embodiments of this invention will be interpreted in the sense that would be understood by one of ordinary skill in the art to which this invention pertains, and general terms, such as those defined in dictionaries, will be interpreted according to their meaning in the context of the relevant art.

[0036] Furthermore, the terminology used in the embodiments of this invention is intended to describe the embodiments and not to limit the invention.

[0037] In this specification, unless the context otherwise requires, the singular form may include the plural form, and references to “at least one (or more) of A and / or B and C” may include one or more combinations of any combination of A, B and C that can be assembled.

[0038] In addition, the terms first, second, A, B, (a), (b), etc., can be used to describe components of embodiments of the present invention. Such terms are intended only to distinguish one component from another and are not intended to limit the nature, order, or sequence of such components.

[0039] Furthermore, when a component is described as “connected,” “joined,” or “attached” to another component, it can include cases where the component is directly “connected,” “joined,” or “attached” to another component, as well as cases where the component is “connected,” “joined,” or “attached” to another component located between that component and other components.

[0040] Furthermore, when described as being formed or disposed "above" or "below" each component, "above" or "below" includes not only when two components are in direct contact with each other, but also when one or more other components are formed or disposed between the two components. Additionally, when expressed as "above" or "below," it can include both upward and downward meanings relative to a single component.

[0041] As used in this article, "axial direction" is defined as the direction of the rotational center that forms the internal or external gear. "Axial direction" can be a reference... Figure 5 The direction in which the disassembled configuration is connected. "Axial direction" can be defined as upward or downward.

[0042] As used herein, “radial direction” is defined as the direction perpendicular to “axial direction” as described above. “Radial direction” can be defined as the direction in which the mountain portion protrudes from the inner surface of the external gear, or the direction in which the mountain portion protrudes from the outer surface of the internal gear.

[0043] In addition, the "radial direction" can be the direction corresponding to the arrangement of the stator, external gear, and internal gear.

[0044] As used in this article, "circumferential direction" can be defined as the circumferential direction of any of the stator, external gear, and internal gear, or the circumferential direction of a region that forms an imaginary concentric circle relative to the circumferential direction of any of the stator, external gear, and internal gear.

[0045] Figure 1 This is a perspective view illustrating the appearance of a pump according to an exemplary embodiment of the present invention. Figure 2 The images show perspective views of the exterior of a pump according to an exemplary embodiment of the present invention from different angles. Figure 3 This is a plan view showing a side view of a pump according to an exemplary embodiment of the present invention. Figure 4 This is a cross-sectional view of a pump according to an exemplary embodiment of the present invention. Figure 5 This is an exploded perspective view of a pump according to an exemplary embodiment of the present invention. Figure 6 This is an exploded perspective view of the housing and external gear according to an exemplary embodiment of the present invention. Figure 7 This is a cross-sectional view showing the connection structure of the housing and the external gear according to an exemplary embodiment of the present invention. Figure 8 This is a perspective view of an external gear according to an exemplary embodiment of the present invention, and Figure 9 This is a perspective view showing the upper surface of a protrusion in a housing according to an exemplary embodiment of the present invention.

[0046] Now refer to Figures 1 to 9 According to an exemplary embodiment of the present invention, the pump 10 can be formed by a combination of a housing 100 and a cover 200. The cover 200 can be coupled to one surface of the housing 100. The cover 200 can be coupled to the upper surface of the housing 100. The housing 100 and the cover 200 can be screwed together. The housing 100 and the cover 200 can each include a connecting portion into which the screw is screwed.

[0047] Within the housing 100, a stator 300, an external gear 400, an internal gear 500, a housing 600, and a bearing 700 can be installed. The housing 100 can be referred to as the motor area. A printed circuit board 230 and connectors can be installed on the cover 200. The cover 200 can be referred to as the control area.

[0048] The cover 200 may include a space in which the printed circuit board 230 can be disposed by coupling with the housing 100. On the side of the cover 200, a connector extrusion 290 may be arranged for coupling with external terminals. A connector electrically connected to the printed circuit board 230 may be disposed within the connector extrusion 290. Power can be supplied to the pump 10 via the connector extrusion 290, or electrical signals for driving the pump 10 can be transmitted or received via the coupling with external terminals.

[0049] On the lower surface of the cover 200, a housing connection portion 270 may be formed. The housing connection portion 270 is shaped to protrude downward from other areas, and at least a portion of the housing connection portion 270 may be connected to a space 112 within the housing 100. A sealing member 272 may be provided between the outer surface of the housing connection portion 270 and the inner surface of the housing 100. A sealing member engagement groove for engaging the sealing member 272 may be formed on the side of the housing connection portion 270.

[0050] The housing 100 may be disposed on the lower portion of the cover 200. The housing 100 may include an upper housing 110 and a lower housing 120. The upper housing 110 may have a circular cross-sectional shape and may have a space 112 formed in the upper housing 110, in which the stator 300, external gear 400, internal gear 500, canister 600 and bearing 700 are disposed. The lower housing 120 may be disposed on the lower surface of the upper housing 110 and may have a rectangular cross-sectional shape.

[0051] The housing 100 may be made of metal or plastic material, but is not limited to this.

[0052] The lower housing 120 may include openings. On the lower surface of the lower housing 120, a first opening 122 may be formed through which fluid is drawn in; and a second opening 124 through which fluid that has circulated within the space of the pump 10 is discharged to the outside. On the upper surface of the lower housing 120, a third opening 132 connected to the first opening 122 and a fourth opening 134 connected to the second opening 124 may be formed. It is also understood that the third opening 132 and the fourth opening 134 are formed on the bottom surface of the space within the upper housing 110.

[0053] The third opening 132 and the fourth opening 134 can each be formed with an arc shape and can be spaced apart to gradually narrow from one side to the other. More specifically, the wider side of the third opening 132 can be set to face the wider side of the fourth opening 134, and the narrower side of the third opening 132 can be set to face the narrower side of the fourth opening 134.

[0054] In this embodiment, the fluid circulating in pump 10 can be oil.

[0055] A protrusion 130 may be provided on the upper surface of the lower housing 120, forming the bottom surface of the space 112 within the housing 100. The protrusion 130 may be shaped such that it protrudes upward from the upper surface of the lower housing 120 above other areas. The protrusion 130 may have a circular cross-sectional shape. The protrusion 130 may be connected to the can 600. The protrusion 130 may be disposed within the space of the can 600. The cross-sectional shape of the protrusion 130 may be formed to correspond to the cross-sectional shape of the space within the can 600. A third opening 132 and a fourth opening 134 may be formed on the upper surface of the protrusion 130.

[0056] A sealing member 180 may be provided between the protrusion 130 and the tank 600 to prevent fluid leakage between the side of the protrusion 130 and the inner surface of the tank 600. The sealing member 180 may be made of rubber or resin. The side of the protrusion 130 may include a sealing member connection groove, which is more concave than other areas joined by the sealing member 180.

[0057] A stator 300 may be disposed within the housing 100. The stator 300 may be disposed within a space 112 within the upper housing 110. A stator receiving space for the stator 300 may be formed on the outer side of the protrusion 130 of the space 112 in the housing 100. The stator 300 may be disposed between the inner surface of the upper housing 100 and the outer surface of the can 600 (described later).

[0058] If the housing 100 is made of plastic, the stator 300 can be integrally formed with the housing 100 by co-injection or insert injection. The stator 300 can be molded within the stator receiving space.

[0059] The stator 300 may include a stator core 310 and a coil 320 wound on the stator core 310. The stator 300 may include an insulator 330 (see [link to documentation]). Figure 10 The insulator 330 is configured to wrap around the outer surface of the stator core 310. The coil 320 can be wound around the outer surface of the insulator 330. Wiring members can be provided on the upper surface of the stator core 310, and the coil 320 protruding from the upper surface of the stator core 310 can be aligned through the wiring members. Busbars can be arranged on the wiring members, wherein the busbars can have fused ends of the coil 320 protruding upward from the stator core 310. Terminals with a shape protruding upward from the wiring members can be provided on the upper surface of the wiring members. A printed circuit board 230 within the cover 200 can be electrically connected to the terminals.

[0060] A gear may be disposed inside the stator 300 within the space 112 within the housing 100. The gear may be disposed on the protrusion 130. The gear may be disposed within the space 112 within the can 600. The gear may include an external gear 400 and an internal gear 500.

[0061] The external gear 400 can be located inside the stator 300. The housing 600 can be located between the external gear 400 and the stator 300.

[0062] The external gear 400 may include a core 410 and a magnet 450 connected to the outer surface of the core 410. The magnet 450 may be disposed on the outer surface of the core 410, radially facing the coil 320. The external gear 400 may be of the surface permanent magnet (SPM) type, wherein the magnet 450 is attached to the outer circumferential surface of the core 410. For this purpose, the outer circumferential surface of the core 410 may be formed with a magnet connection portion 480 to which the magnet 450 is connected (see...). Figure 6 The magnet connecting portion 480 can be in the shape of a groove, and is formed to be more concave than other areas on the outer surface of the core 410. Multiple magnet connecting portions 480 can be provided and spaced apart from each other along the circumferential direction of the core 410. The magnet connecting portion 480 can have a downwardly open shape on the side facing the protrusion 130. When the magnet 450 engages within the magnet connecting portion 480, the inner surface of the magnet 450, the two sides connected to the inner surface, and the upper surface facing the cover 200 can contact the core 410. By means of the downwardly open shape of the magnet connecting portion 480, the lower surface of the magnet 450 can be arranged to face the bottom surface of the space of the housing 112 or the upper surface of the protrusion 130 in the upward direction.

[0063] The outer surface of the magnet 450 can be arranged to protrude radially outward from the outer surface of the core 410.

[0064] External gear 400 may include guide portion 470 (see...) Figure 8 The guide portion 470 may be formed to protrude outward from the outer surface of the core 410. The guide portion 470 may include multiple guide portions and may be spaced apart from each other in the circumferential direction. The guide portion 470 may be disposed between two adjacent magnet connecting portions 480. The multiple guide portions 470 and the multiple magnet connecting portions 480 may be arranged alternately in the circumferential direction of the core 410. The guide portion 470 may support the side of the magnet 450.

[0065] The side portion of the guide portion 470 facing the magnet 450 may be formed with an inclined surface, the circumferential length of which increases with the radially outer side closer to the core 410. Furthermore, the side portion of the magnet 450 facing the guide portion 470 may also be formed with an inclined surface corresponding to the inclined surface.

[0066] When current is applied to the coil of stator 300, external gear 400 can rotate through the electromagnetic interaction between stator 300 and external gear 400.

[0067] A bearing support portion 420 may be formed on the upper surface of the core 410, and the bearing support portion 420 has a shape that protrudes upward from other areas. The bearing support portion 420 may have a circular cross-section. A bearing 700 (described later) may be connected to the inner side of the bearing support portion 420. The inner surface of the bearing support portion 420 may contact the outer surface of the outer ring 730 of the bearing 700. The bearing 700 may be press-fitted into the bearing support portion 420.

[0068] A hole can be formed in the center of the core 410, and the internal gear 500 is disposed in this hole. The hole formed in the center of the external gear 400 can be referred to as the first hole. On the inner surface of the inner circumferential surface of the core 410 where the first hole is formed, an inwardly protruding mountain-shaped portion 430 can be provided (see...). Figure 6 The number of mountain portions 430 can be multiple, and they can be arranged along the circumferential direction of the core 410. Between the multiple mountain portions 430, concave valley portions can be provided, that is, the first gear can be formed on the inner circumferential surface of the first hole where the multiple mountain portions 430 and valley portions are alternately arranged.

[0069] The internal gear 500 can be disposed inside the external gear 400. The internal gear 500 can be disposed in the first hole of the external gear 400. The external gear 400 can be referred to as the external rotor, and the internal gear 500 can be referred to as the internal rotor.

[0070] The outer circumferential surface of the internal gear 500 may include a plurality of mountain portions 520 protruding outward from the outer circumferential surface and valley portions disposed between the plurality of mountain portions 520. A second gear may be formed on the outer circumferential surface of the internal gear 500, with the plurality of mountain portions 520 and the plurality of valley portions alternating.

[0071] In other words, the internal gear 500 may have a second convex angle with N teeth arranged radially outward relative to the center of rotation in the circumferential direction. The external gear 400 may be configured to have N+1 first convex angles radially inward. The first convex angles may be arranged to be engaged by the second convex angles. When the external gear 400 rotates, the first and second convex angles cause the internal gear 500 to rotate. Depending on the rotation of the internal gear 500, fluid may be drawn into the space within the tank 600, as described later, or fluid in the space within the tank 600 may be discharged to the outside.

[0072] The external gear 400 and the internal gear 500 can rotate eccentrically. The eccentricity of the external gear 400 and the internal gear 500 creates a fluid fuel carrying volume between them, such that the increased volume draws in surrounding fluid while the pressure decreases, and the decreased volume discharges fluid while the pressure increases.

[0073] The internal gear 400 and the external gear 500 can be arranged such that their centers do not coincide. The external gear 400 and the internal gear 500 can have different centers of rotation.

[0074] A second hole 510 may be formed in the center of the internal gear 500, to which the shaft 140 (described later) is connected.

[0075] Pump 10 may include a tank 600. Tank 600 may be disposed in space 112 within housing 100. Tank 600 may include a side surface portion 620 and a top surface portion 610, the side surface portion 620 forming a side surface and radially facing stator 300, and the top surface portion 610 forming a top surface and facing cover 200.

[0076] A space can be formed inside the tank 600. The inner surface of the side surface portion 620 and the lower surface of the upper surface portion 610 can form the inner surface of this space. An internal gear 500, an external gear 400, a bearing 700, and a shaft 140 can be installed within this space inside the tank 600. The tank 600 can be arranged to surround the protrusion 130. A sealing member 180 can be provided between the side surface portion 620 and the protrusion 130.

[0077] Can 600 may include two or more regions with different cross-sectional areas. Can 600 may include an upper region and a lower region. The cross-sectional area of ​​the upper region of can 600 may be smaller than the cross-sectional area of ​​the lower region of can 600. The upper region of can 600 may be connected to a connection hole 280 formed on the lower surface of the cover 200, which will be described later.

[0078] The can 600 may include a stator guide portion 622. The stator guide portion 622 may be shaped to protrude outward from the outer surface of the side surface portion 620. There may be multiple stator guide portions 622, and they may be spaced apart from each other along the circumferential direction of the can 600. The stator guide portions 622 may be coupled to the stator 300. The stator core 310 may include multiple circumferentially arranged separate cores, and the stator guide portion 622 may be coupled between two adjacent separate cores.

[0079] A hole 612 may be formed in the center of the upper surface portion 610. The hole 612 may be shaped to extend downward from the upper surface of the upper surface portion 610. Fluid may flow through the hole 612.

[0080] The material of can 600 can be plastic. Can 600 can be integrally formed with housing 100 by insertion injection.

[0081] Pump 10 may include a shaft 140. Shaft 140 may support the internal gear 500 for rotation. Shaft 140 may be shaped to project upward from the upper surface of protrusion 130. Shaft 140 may be integrally formed with housing 100. Shaft 140 may be connected to a second hole 510 of internal gear 500. Shaft 140 may form the rotation center of internal gear 500.

[0082] The shaft 140 may be configured to penetrate the internal gear 500, such that at least a portion of the shaft 140 protrudes upward above the upper surface of the internal gear 500. The upward and downward lengths of the shaft 140 may be longer than the upward and downward lengths of the internal gear 500 or the external gear 400.

[0083] The upper surface of the shaft 140 may be provided with a connecting rib 142, which is shaped to project upwards from the upper surface over other areas. The connecting rib 142 may have a cross-sectional area smaller than that of the shaft 140. The connecting rib 142 may be connected to a central hole in the bearing guide, as will be described later.

[0084] A connecting hole can be formed in the upper surface of the shaft 140. The connecting hole can be recessed downward from the upper surface of the shaft 140. A connecting member 800 can be connected in the connecting hole. A rigid connection between the shaft 140 and the bearing 700 can be achieved through the connecting member 800.

[0085] Pump 10 may include a bearing 700. The bearing 700 may be disposed within the space of tank 600. The bearing 700 may support the rotation of external gear 400. The bearing 700 may be press-fitted into the inner side of the bearing support portion 420 of external gear 400. The bearing 700 may be a ball bearing. Bearing 480 may include a radially spaced outer ring 720 and an inner ring 710, and balls 730 disposed between the outer ring 720 and the inner ring 710.

[0086] A bearing guide portion can be connected to the center of the bearing 700. A hole-like space for engaging the bearing guide portion can be formed in the center of the bearing 700. Based on upward and downward directions, the bearing guide portion can be disposed between the external gear 400 and the bearing 700. The bearing guide portion may include a plate portion 750 and a shaped connecting portion 760 protruding upward from the upper surface of the plate portion 750. The plate portion 750 can be formed in the shape of a plate and can be disposed on the external gear 400 and the internal gear 500. A hole can be formed in the center of the plate portion 750, in which the connecting rib 142 of the shaft 140 engages. The connecting portion 760 can have a circular cross-sectional shape and can be press-fitted into the inner side of the inner ring 710 of the bearing 700. A connecting member 800 can be disposed on the inner side of the connecting portion 760. The connecting member 800 can be connected downward from the upper region of the bearing guide portion and can engage in the connecting hole of the shaft 140.

[0087] The torque reduction structure of pump 10 will be described below.

[0088] On the upper surface of the protrusion 130 facing the external gear 400, a recess 150 may be formed, which is more recessed downward than in other areas. The bottom surface of the recess 150 may be stepped downward from the upper surface of the protrusion 130. The recess 150 may have a groove shape. The recess 150 may have a circular cross-sectional shape. The recess 150 may form the edge of the protrusion 130.

[0089] The recess 150 may be configured to at least partially overlap with the external gear 400 in the upward and downward directions. The recess 150 may be configured to overlap with the core 410 or magnet 450 of the external gear 400 in the upward and downward directions. Some recesses of the recess 150 may be configured to overlap with the core 410 in the vertical direction, while other recesses may be configured to overlap with the magnet 450 in the vertical direction.

[0090] like Figure 7 As shown, the recess 150 may include a bottom surface 152 and a side surface 154 connecting the bottom surface 152 to the upper surface of the protrusion 130. The side surface 154 may be inclined in the radial direction of the protrusion 130 such that the distance to the center of the protrusion 130 increases as the side surface 154 moves outward.

[0091] The axial length C of the recess 150 can be greater than 0.1 mm and less than 0.5 mm.

[0092] The diameter B of the area on the upper surface of the protrusion 130 other than the area forming the recess 150 (see...) Figure 9 The diameter A of the anti-friction zone of the external gear 400 can be compared with that of the external gear 400 (see...). Figure 8 Correspondingly, the diameter A of the anti-friction zone of the external gear 400 can be smaller or larger. Here, the anti-friction zone of the external gear 400 can be the area defined by the imaginary circle 900 connecting the circumferential centers of the magnet 450 on the bottom surface of the external gear 400. The difference between the diameter B of the area on the upper surface of the protrusion 130, excluding the area forming the recess 150, and the diameter A of the anti-friction zone of the external gear 400 is 0.1 mm or less.

[0093] The radial length F of the recess 150 (see) Figure 7 The radial thickness can be less than 450 mm from the magnet.

[0094] In order to form a placement area for a conventional magnet, the following problem exists: as the unnecessary area in the core, including the external gear, increases, frictional torque is generated with the cover.

[0095] Therefore, according to this embodiment, it is advantageous to achieve a torque reduction structure by means of the recess 150 on the protrusion 130 facing the external gear 400 axially, thereby preventing frictional torque generated between the external gear 400 and the housing 100 due to the rotation of the external gear 400.

[0096] In the following description, the temperature sensing structure of the fluid in the pump 10 according to an exemplary embodiment of the present invention will be described.

[0097] Figure 10 This is a cross-sectional view illustrating a temperature sensing structure in a pump according to an embodiment of the present invention.

[0098] Reference Figures 1 to 10 A second space 250 can be formed on the lower surface of the cover 200 facing the housing 100, and the second space 250 is recessed upward from other areas. In this case, the space 112, which includes the stator 300 configuration within the housing 100, can be referred to as the first space. The second space 250 can be formed in the upper region of the tank 600. At the entrance of the second space 250, a connection hole 280 with a cross-sectional area smaller than that of the second space 250 can be formed, through which the upper region of the tank 600 can be connected.

[0099] The pressures in the first space 112 and the second space 250 can be different. In one example, the pressure in the first space 112 can be higher than the pressure in the second space 250. Here, the pressure in the first space 112 can be the pressure in the space within the tank 600.

[0100] In the second space 250, a temperature sensor 260 for detecting the temperature of the fluid in the pump 10 can be provided. The temperature sensor 260 can be coupled to the inner surface of the second space 250. Therefore, the temperature of the fluid introduced into the second space 250 through the hole 612 formed in the upper surface of the tank 600 can be detected by the temperature sensor 250. The temperature sensor 250 can be electrically connected to the printed circuit board 230 in the cover 200, and the temperature information of the fluid detected by the temperature sensor 250 can be transmitted to a controller (not shown) via a connector.

[0101] The diameter of the hole 612 formed on the upper surface of the can 600 may be at least 0.5 mm and no more than 2 mm.

[0102] On the other hand, the fluid introduced into the second space 250 for temperature sensing can move to the placement space of the stator 300 through the space between the inner surface of the connecting hole 280 and the outer surface of the tank 600.

[0103] Based on the above structure, it is advantageous to place the temperature sensor 260 in the fluid flow space of the pump 10, so that the temperature of the working fluid can be detected more accurately.

[0104] Although all components in the embodiments of the present invention have been described above as operating in combination or in combination, the invention is not necessarily limited to these embodiments; that is, all components in the components may optionally be combined in one or more combinations, as long as they are within the scope of the invention. Furthermore, unless explicitly stated to the contrary, the terms “comprising,” “including,” or “having” as used herein are intended to mean that a component in discussion may be inherent in other components, and therefore should be construed as including rather than excluding other components. Unless otherwise defined, all terms, including technical or scientific terms, should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Common terms, such as dictionary definitions, should be interpreted as consistent with their meaning in the context of the relevant field, and unless explicitly defined herein, these terms should not be interpreted in an ideal or overly formal sense.

[0105] The foregoing description is merely an exemplary description of the technical concept of the present invention, and various modifications and variations will be apparent to those skilled in the art without departing from the essential characteristics of the invention. Therefore, the embodiments disclosed herein are intended to illustrate and not limit the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the appended claims, and all technical concepts within the scope of the present invention should be interpreted as falling within the scope of the present invention.

Claims

1. A pump, the pump comprising: case; The stator is disposed in the space within the housing; An external gear is disposed in the stator; And an internal gear disposed in the external gear, wherein the bottom surface of the space in the housing is configured to have a protrusion that protrudes upward from the external gear, and the upper surface of the protrusion has a recess that protrudes downward from the external gear.

2. The pump according to claim 1, wherein, The external gear includes a core, a plurality of magnets connected to the side of the core, and the recess is configured to overlap with the core or the magnets in the upward and downward directions.

3. The pump according to claim 2, wherein, The recess forms the edge of the protrusion.

4. The pump according to claim 1, wherein, A second hole is formed in the center of the internal gear, and the pump includes a shaft that protrudes upward from the upper surface of the protrusion and connects to the second hole.

5. The pump according to claim 1, wherein, The recess includes a bottom surface and a side portion. The bottom surface extends downwards in a stepped manner from the upper surface of the protrusion. The side portion connects the upper surface of the protrusion to the bottom surface. The side portion is formed to slope outwards, thereby increasing the distance to the center of the protrusion.

6. The pump according to claim 2, wherein, The diameter (B) of the area on the upper surface of the protrusion other than the area formed by the recess corresponds to the diameter of the anti-friction area of ​​the external gear, wherein the anti-friction area of ​​the external gear is the area on the lower surface of the external gear defined by an imaginary circle connecting the circumferential centers of the magnet.

7. The pump according to claim 1, wherein, The axial length of the recess is at least 0.1 mm and no more than 0.5 mm.

8. The pump according to claim 2, wherein, The radial length (F) of the recess is less than the radial thickness of the magnet.

9. The pump according to claim 1, wherein, The upper surface of the protrusion is formed with a third opening for fluid entry and a fourth opening for fluid exit.

10. The pump according to claim 2, wherein, The outer surface of the magnet protrudes outward from the outer surface of the core.

Images