WO2022075729A1 - 전동 펌프 - Google Patents
전동 펌프 Download PDFInfo
- Publication number
- WO2022075729A1 WO2022075729A1 PCT/KR2021/013665 KR2021013665W WO2022075729A1 WO 2022075729 A1 WO2022075729 A1 WO 2022075729A1 KR 2021013665 W KR2021013665 W KR 2021013665W WO 2022075729 A1 WO2022075729 A1 WO 2022075729A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gear
- disposed
- gear unit
- support member
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/008—Enclosed motor pump units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/10—Stators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/60—Shafts
Definitions
- the present invention relates to an electric pump.
- An Electric Oil Pump discharges a flow rate at a constant pressure.
- Such an oil pump includes a housing, a gear disposed in the housing, and a motor for driving the gear unit.
- the conventional electric oil pump has a problem in that the gear part and the motor part are mechanically separated and the length in the axial direction is increased.
- the housing is made of a plastic material, thermal deformation may occur due to heat generation of the gear unit during driving. Accordingly, there is a problem in that a play occurs between the housing and the gear unit or an axial center error occurs between a plurality of gears included in the gear unit, thereby reducing the efficiency of the electric oil pump.
- An object of the present invention is to provide an oil pump in which the size of the housing is possible, the axial play of the gear unit caused by thermal deformation of the housing is prevented, and the drive of the gear unit is stabilized.
- An embodiment includes a housing; a gear unit disposed in the housing; a stator disposed to correspond to the gear unit; and a support member disposed between the gear part and the housing, wherein the gear part comprises a first gear, a second gear disposed to correspond to the first gear, and a magnet disposed on the second gear,
- the support member may provide an electric pump including a first area supporting the first gear and a second area protruding from the first area and inserted into the first gear.
- the second region may penetrate the first gear.
- a housing a gear unit disposed in the housing; a stator disposed to correspond to the gear unit; a cover disposed on the upper side of the gear unit; and a support member disposed on a lower side of the gear part, wherein the support member passes through the gear part in an axial direction to provide an electric pump including a second region coupled to the cover.
- the housing may be coupled to the cover.
- the housing may include a lower surface supporting the gear unit and the support member, and a side wall extending upwardly from the lower surface.
- An embodiment includes a mold member; a gear unit disposed in the mold member; a stator disposed to correspond to the gear unit; and a metal support member disposed between the gear part and the mold member, wherein the gear part includes a first gear, a second gear disposed to correspond to the first gear, and a magnet disposed on the second gear.
- the gear part includes a first gear, a second gear disposed to correspond to the first gear, and a magnet disposed on the second gear.
- Including, at least a portion of the support member may provide an electric pump disposed between a lower surface of the gear unit and one surface of the mold member.
- the stator may be embedded in the mold member.
- the mold member may include a receiving part in which the gear part is disposed, and an upper surface of the mold member may be disposed higher than an upper end of the stator.
- An embodiment includes a housing; a gear unit disposed in the housing; a driving unit for driving the gear unit; and a support member disposed between the gear unit and the housing, wherein the gear unit includes a first gear and a second gear rotating corresponding to the first gear, and the driving unit is disposed on the second gear. It is possible to provide an electric pump including a magnet and a coil disposed to correspond to the magnet, wherein the support member includes a first area coupled to the housing and a second area fixed to the first gear.
- the housing may include a receiving part in which the gear part is disposed.
- the support member may include aluminum.
- One region of the support member may penetrate the gear unit in the axial direction, and another region may support the gear unit in the axial direction.
- An upper end of the support member may be disposed higher than an upper surface of the gear unit.
- a maximum diameter of the support member may be greater than or equal to an outer diameter of the gear unit.
- the gear unit may have a through hole in which the support member is disposed, and a protrusion protruding toward the axial center of the gear unit may be formed on an inner circumferential surface in which the through hole is formed.
- the support member may include a side surface facing the inner circumferential surface of the gear part in a radial direction, some of the side surfaces of the support member may be in contact with the protrusion, and the other part may be spaced apart from the inner circumferential surface of the gear part.
- the present invention it is possible to prevent axial play of the gear unit due to thermal deformation of the housing, and reduce the axial center error of the gears included in the gear unit, thereby enabling stable driving of the electric pump.
- a separate motor unit may be omitted by providing power required for pumping oil to oil using an electrical interaction between the gear unit and the stator. Accordingly, the axial length of the electric pump can be reduced and the electric pump can be downsized.
- FIG. 1 is a cross-sectional view schematically showing an electric pump according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view schematically illustrating an electric pump according to another embodiment of the present invention.
- FIG 3 is a cross-sectional view illustrating an electric pump according to another embodiment of the present invention.
- FIG. 4 is an exploded perspective view illustrating an electric pump according to another embodiment of the present invention.
- FIG. 5 is a cross-sectional perspective view illustrating a cross section of a housing and a stator.
- FIG. 6 is a perspective view illustrating a state in which the gear unit and the support member are coupled.
- FIG. 7 is an exploded perspective view illustrating a first gear, a second gear, and a support member.
- FIG. 8 is a plan view illustrating a state in which the gear unit and the support member are coupled.
- FIG. 9 is a perspective view illustrating a support member.
- FIG. 10 is a plan view showing the support member.
- FIG. 11 is a side view showing the support member
- FIG. 12 is an enlarged view of a portion of FIG. 11 .
- FIG. 13 is a plan view illustrating a state in which the first gear and the support member are coupled.
- Fig. 14 is a partial cross-sectional view of the electric pump shown in Fig. 3;
- 15 is a graph comparing the comparative example and the example with respect to the oil flow rate with respect to the oil pressure.
- a direction parallel to the rotational axis as a reference for the rotational motion of the gear unit is referred to as an axial direction
- a direction perpendicular to the axial direction about the rotational axis is referred to as a radial direction
- a circle having a radial radius around the axial direction is referred to as the radial direction.
- the direction along it is called the circumferential direction.
- FIG. 1 is a cross-sectional view schematically showing an electric pump according to an embodiment of the present invention.
- the electric pump 10 includes a housing 110 , a gear unit 120 , a stator 130 , a support member 140 , a cover 150 , and a power supply unit 160 .
- the housing 110 and the cover 150 may form the external shape of the electric pump 10 .
- the stator 130 and the gear unit 120 may be disposed inside the housing 110 .
- the housing 110 may be formed of a resin or plastic material.
- the housing 110 may include a lower surface 111 and a side wall 112 .
- the lower surface 111 may support the stator 130 and the gear unit 120 in the axial direction.
- the side wall 112 may surround the stator 130 from the outside.
- the gear unit 120 may be disposed inside the stator 130 .
- the gear unit 120 rotates through electrical interaction with the stator 130 .
- the gear unit 120 may be disposed to correspond to the stator 130 and may be disposed inside.
- the gear unit 120 serves to pump the fluid and provides power required for pumping.
- the stator 130 is disposed to correspond to the gear unit 120 .
- a coil forming a rotating magnetic field is wound around the stator 130 to induce electrical interaction with the gear unit 120 to induce rotation of the gear unit 120 .
- the support member 140 may be disposed between the gear unit 120 and the housing 110 . In this case, the support member 140 may be fixed to the lower surface 101 . In addition, an end of the support member 140 may pass through the gear unit 120 to be coupled to the cover 150 .
- the support member 140 may be made of a metal material. The support member 140 may rub against the lower surface of the gear unit 120 while the gear unit 120 rotates. The support member 140 may reduce rotational friction of the gear unit 120 and prevent axial play of the gear unit 120 . In addition, one side of the support member 140 may pass through the gear unit 120 in the axial direction to fix the axis of rotation of the gear unit 120 . placed in the same way,
- the cover 150 may be disposed on the upper side of the gear unit 120 .
- the cover 150 may be coupled to the housing 110 .
- the cover 150 may be formed of a metal material. In this case, the cover 150 may be made of the same material as the support member 140 .
- the cover 150 may include aluminum.
- the power supply unit 160 may be disposed on one side of the housing 110 .
- the power supply unit 160 may be electrically connected to the stator 130 to supply current to the stator 130 .
- the power supply unit 160 may include a printed circuit board and electronic components mounted on the printed circuit board.
- Figure 2 is a cross-sectional view schematically showing an electric pump according to another embodiment of the present invention
- Figure 3 is a cross-sectional view showing an electric pump according to another embodiment of the present invention
- Figure 4 is another embodiment of the present invention It is an exploded perspective view showing an electric pump according to the
- the electric pump 20 includes a mold member 210 , a gear unit 220 , a stator 230 , a support member 240 , a cover 250 , and a power supply unit 260 . can do.
- the mold member 210 covers the stator 230 .
- the mold member 210 may be injection-molded to the stator 230 .
- the mold member 210 may include an accommodating part therein.
- a gear unit 220 is disposed in the receiving unit.
- the receiving portion may have a cylindrical shape. The diameter of the receiving part may be larger than the outer diameter of the gear part 220 .
- the gear part 220 may be disposed in the receiving part of the mold member 210 .
- the gear unit 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 .
- the magnet 223 may be disposed on the outer peripheral surface of the second gear 222 .
- the magnet 223 may be disposed along the circumferential direction.
- the stator 230 is disposed inside the mold member 210 . In addition, the stator 230 is disposed to correspond to the gear unit 220 .
- the stator 230 is electrically connected to the power supply 260 , and when current is supplied from the power supply 260 , an electrical interaction with the magnet 223 may be induced.
- the support member 240 is disposed between the gear unit 220 and the mold member 210 .
- One surface of the support member 240 is in contact with the mold member 210 .
- one surface of the support member 240 may be fixed to the mold member 210 .
- An end of the support member 240 may pass through the gear unit 220 .
- an end of the support member 240 may be coupled to the cover 250 .
- the support member 240 may be made of a metal material.
- the support member 240 may slide with the gear unit 220 when the gear unit 220 is driven by the electrical interaction between the stator 230 and the gear unit 220 .
- the support member 240 is formed of a metal material and has excellent sliding properties with the gear unit 220 .
- the support member 240 fixes the axis of rotation of the gear unit 220 so that the gear unit 220 can be driven more stably.
- the cover 250 may be disposed on the upper side of the gear unit 220 and may be coupled to the upper end of the mold member 210 .
- the cover 250 may be formed of a metal material.
- the cover 250 may include a suction port (not shown) and an exhaust port (not shown). The suction port (not shown) and the discharge port (not shown) may induce the fluid to be smoothly sucked and discharged by the gear unit 220 .
- the power supply 260 may be disposed on one side of the mold member 210 .
- the power supply unit 260 may be electrically connected to the stator 230 to supply current to the stator 230 .
- the power supply unit 260 may include a printed circuit board and electronic components mounted on the printed circuit board.
- FIG. 5 is a cross-sectional perspective view illustrating a cross section of a mold member and a stator.
- the stator 230 includes 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 . can do.
- the coil 232 may be connected to the power supply 260 .
- the stator 230 is embedded in the mold member 210 .
- the mold member 210 may cover the stator core 231 , the coil 232 , and the insulator 233 .
- the mold member 210 may be coupled to the stator 230 by an injection method.
- an insert injection method may be used.
- the mold member 210 may be formed of a resin or plastic material.
- the mold member 210 may be formed of a heat-conducting plastic material.
- the heat-conducting plastic may include pellet-type resin, heat-dissipating resin, PPA (Polyphtalamide) resin, CNT (Carbon NanoTube), and the like.
- a cover 250 may be disposed on the upper surface 210A of the mold member 210 .
- the upper surface 210A of the mold member 210 may be disposed higher than the upper end of the stator 230 .
- at least one fastening hole 210H may be formed in the upper surface 210A of the mold member 210 .
- a screw thread for coupling the fastening member may be formed in the fastening hole 210H.
- the fastening hole 210H may be coupled to the cover 250 by a fastening member.
- the mold member 210 may form the receiving part S.
- the gear unit 220 may be disposed in the receiving unit S.
- the receiving portion (S) may have a cylindrical shape.
- the axial length of the receiving portion S may be greater than the axial length of the gear portion 220 .
- the size of the diameter of the receiving portion (S) may be larger than the size of the outer diameter of the gear portion (220).
- the upper side of the receiving portion (S) may be closed by the cover (250).
- the edge of the cover 250 is coupled to the upper surface 210A of the mold member 210 .
- the central part of the cover part 250 may protrude toward the gear part 210 and may be disposed in the receiving part S. In this case, the central portion of the cover 250 may fix the upper end of the gear unit 220 .
- the receiving part S may be connected to a suction port (not shown) and an exhaust port (not shown) of the cover 250 . In this case, the suction port (not shown) and the discharge port (not shown) may be partitioned in space.
- FIG. 6 is a perspective view showing a state in which the gear unit and the supporting member are coupled
- FIG. 7 is an exploded perspective view showing the first gear, the second gear and the supporting member
- FIG. 8 is the second gear and the supporting member It is one floor plan.
- gear unit 220 and the support member 240 shown in FIG. 3 have been described with reference, but the shapes of the gear unit 220 and the support member 240 described in this embodiment The above functions may also be applied to the gear unit 120 and the support member 140 shown in FIGS. 1 and 6 .
- the support member 240 supports the gear unit 220 in the axial direction.
- the support member 240 may pass through the gear unit 220 to fix the rotational axis of the gear unit 220 .
- the support member 240 may include a first area 241 and a second area 242 .
- the first region 241 is disposed below the gear unit 220 .
- the first region 241 may support the lower surface of the gear unit 220 .
- the first region 241 may be fixed to the mold member 210 .
- the first region 241 may have a disk shape.
- the diameter D2 of the first region 241 may be greater than or equal to the outer diameter D1 of the gear unit 220 .
- the diameter of the first region may be smaller than the outer diameter of the gear part, and the edge of the gear part may be spaced apart from the mold member.
- the second region 242 may protrude from the first region 241 .
- the second region 242 may pass through the first gear 221 .
- the second region 242 may be disposed at the center of rotation of the first gear 221 .
- the second region 242 may be an axially extending cylindrical member.
- the diameter of the second region 242 may be smaller than the diameter of the inner peripheral surface of the first gear 221 .
- the first gear 221 may be disposed inside the second gear 222
- the second region 242 may be disposed inside the first gear 221 .
- the second region 242 may penetrate the first gear 221 in the axial direction.
- the axial length of the second region 242 may be greater than the axial length of the gear unit 220 .
- An end of the second region 242 may be disposed higher than an upper surface of the first gear 221 .
- an end of the second region 241 may be coupled to the cover 250 .
- N outer lobes 2211 may be formed in the first gear 221 radially outward with respect to the center of the shaft along the circumferential direction.
- the second gear 222 may be radially inwardly formed with N+1 number of inner lobes 2221 .
- the outer lobe 2211 may be formed to be caught on the inner lobe 2221 .
- the gear unit 220 has a certain eccentric structure when the first gear 221 rotates, and the fluid (oil) can be transported between the first gear 221 and the second gear 222 by this eccentricity. space arises. That is, during the rotational movement of the first gear 221 , the portion with the increased volume sucks the surrounding fluid due to the pressure drop, and the portion with the reduced volume discharges the fluid due to the increase in pressure.
- the gear unit 220 generates electrical interaction with the stator 330 to pump oil and provide power required for pumping. Accordingly, the electric pump according to the present invention can reduce the axial length of the electric pump by omitting a separate motor unit.
- FIG. 9 is a perspective view illustrating the support member
- FIG. 10 is a plan view illustrating the support member
- FIG. 11 is a side view illustrating the support member
- FIG. 12 is an enlarged view of a portion of FIG. 11 .
- the support member 240 may include a first region 241 and a second region 242 protruding upward from the upper surface of the first region 241 .
- the first region 241 and the second region 242 may be integrally formed.
- the support member 240 may include aluminum.
- the cover 250 may be made of the same material as the support member 240 .
- 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 disposed in an axial direction.
- the first surface 241A is disposed toward the gear unit 220 .
- the second surface 241B is disposed toward the mold member 210 .
- the first surface 241A is in contact with the gear unit 220
- the second surface 241B is in contact with the mold member 210 .
- a diameter D2 of the first region 241 may be greater than or equal to an outer diameter of the gear unit 220 .
- the first region 241 may have a disk shape.
- the first region 241 may have a first thickness T1 in the axial direction.
- the first thickness T1 may be equal to a value obtained by subtracting the axial length of the gear unit 220 from the distance between the mold member 210 and the cover 250 disposed in the receiving unit S.
- the axial height of the gear unit 220 may be adjusted according to the first thickness T1 of the first region 241 .
- a gap between the mold member 210 , the gear unit 220 , and the cover 250 disposed in the axial direction may be prevented.
- 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 eccentric to the center of the first surface 241A.
- the shortest distance from one of the edges of the first surface 241A (P1) to the second area 242 is from another point P2 among the edges of the upper surface of the first area 241 to the second area 242 ) may be different from the shortest distance to
- 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 part 2421 may be disposed inside the first gear 221 .
- the diameter D3 of the first part 2421 may be smaller than or equal to the diameter of the inner peripheral surface of the first gear 221 .
- the first part 2421 may be disposed on a rotational shaft serving as a reference for the rotational motion of the first gear 221 to support the radial movement of the gear part 220 .
- the second portion 2422 may extend from an end of the first portion 2421 .
- the second part 2422 may be disposed above the upper surface of the first gear 221 .
- the second part 2422 may be coupled to the cover 250 .
- a groove corresponding to the shape of the second part 2422 may be formed in the cover 250 , and the second part 2422 may be disposed in the groove.
- a diameter D4 of the second portion 2422 may be smaller than a diameter D3 of the first portion 2421 .
- a ratio of the diameter of the second part 2422 to the diameter D3 of the first part 2421 may be 0.5 to 0.8.
- the support member 240 may support the radial movement of the gear unit 220 while the gear unit 220 is driven, and may be coupled to the cover 250 to increase fixing force.
- the axial length L of the second region 242 is equal to the sum of the axial lengths of the first portion 2421 and the second portion 2422 .
- the first part 2421 may have a first length L1 in the axial direction
- the second part 2422 may have a second length L2 in the axial direction.
- the first length L1 may be greater than the second length L2.
- a ratio of the second length L2 to the first length L1 may be 0.15 to 0.4.
- the axial length L of the second region 242 may be smaller than the axial length of the gear unit 220 .
- the upper end of the second region 242 may be lower than the upper surface of the gear unit 220 .
- the upper end of the second region 242 may be spaced apart from the cover 250 .
- the upper edge of the first part 2421 may be tapered.
- the upper edge of the second part 2422 may be tapered.
- the second region 242 may include a step 2423 connecting the first part 2421 and the second part 2422 .
- FIG. 13 is a plan view illustrating a state in which the support member 140 and the first gear are coupled.
- the first gear 211 may have a first width W that is the minimum width in the radial direction.
- the first width W may be the shortest distance between the inner diameter of the first gear 211 and the dedendum circle of the first gear 211 .
- the first width W1 may be smaller than the diameter D3 of the first portion 2421 .
- the first width W1 may be 2 to 4.5 mm, and the diameter D3 of the first part 2421 may be 4.5 to 6.5 mm.
- the first width W1 and the diameter D3 of the first part 2421 may vary depending on the size of the electric pump.
- a ratio of the first width W1 to the diameter D3 of the first portion 2421 may be 0.3 to 1.
- the mechanical rigidity of the first gear 211 may decrease.
- the ratio of the first width W1 to the diameter D3 of the first portion 2421 is increased, the diameter of the first portion 2421 may not be sufficiently secured, and thus the mechanical rigidity of the support member 240 may be reduced.
- Fig. 14 is a partial cross-sectional view of the electric pump shown in Fig. 3;
- the first gear 221 may include a lower surface facing the support member 240 and an upper surface facing the cover 250 .
- the first gear 221 may have a through hole 221H penetrating through the upper surface and the lower surface.
- a rotation axis RA serving as a reference for rotational motion of the first gear 221 may be disposed in the through hole 221H.
- the first part 2421 may be disposed in the through hole 221H.
- the first part 2421 may include a side surface 2421A facing the inner circumferential surface of the first gear 221 .
- the diameter of the through hole 221H is formed to be larger than the diameter of the first part 2421 , so that the side surface 2421 may be spaced apart from the inner circumferential surface of the first gear 221 .
- the first gear 221 may include a protrusion 2212 protruding toward the rotation shaft RA.
- the protrusion 2212 may be disposed on an inner circumferential surface of the first gear 221 .
- the protrusion 2212 may include a protrusion surface 221A in contact with the side surface 2421A of the first part 2421 .
- a side surface 2421A of the first part 2421 may include a first part 2421A1 , a second part 2421A2 , and a third part 2421A3 .
- the first part 2421A1 may be in contact with the protruding surface 221A.
- the first part 2421A1 may be spaced apart from the first area 241 .
- the second part 2421A2 may be disposed between the first area 241 and the first part 2421A1 .
- the second part 2421A2 may be spaced apart from the first gear 221 .
- the second part 2421A2 may have a greater axial length than the first part 2421A1 .
- the third part 2421A3 may be disposed between the first part 2421A1 and the second part 2422 . In this case, the third part 2421A3 may be spaced apart from the first gear 221 .
- the third part 2421A3 of the cover 250 may include a protrusion 251 protruding between the first gears 221 .
- the cover 250 may have a groove 250G formed inside the protrusion 251 .
- the second part 2422 may be disposed in the groove 250G.
- An axial length of the groove 250G may be longer than an axial length of the second portion 2422 .
- the upper end of the second part 2422 may be spaced apart from the cover 250 .
- the cover 250 may include a seating surface 250A disposed between the groove 250G and the protrusion 251 .
- the seating surface 250A may be in contact with the stepped 2423 .
- the cover 250 may include a structure for coupling and fixing the support member 240 to increase the fixing force of the support member 240 .
- 15 is a graph comparing the comparative example and the example with respect to the oil flow rate with respect to the oil pressure.
- the change in the oil flow rate with respect to the oil pressure of the electric pump including the housing, the gear unit, the stator, the support member and the cover having the same structure as in FIG. 3 was measured.
- the electric pump of the embodiment has a structure in which power is generated through a gear unit and pumps oil from the gear unit.
- Comparative Example 1 the change in oil flow rate with respect to the oil pressure of the conventional electric pump in which the motor unit and the pump unit are mechanically separated is measured.
- the electric pump of Comparative Example 1 has a structure in which the pump unit operates by transmitting power generated from the motor unit to the pump unit.
- Comparative Example 2 the change in the oil flow rate with respect to the oil pressure of the electric pump omitting the support member in the structure of FIG. 3 was measured.
- the electric pump of Comparative Example 2 may have the same configuration except that the supporting member is omitted from the electric pump used in the embodiment.
- Comparative Example 2 the flow rate of oil rapidly decreases as the pressure of oil increases as compared to Comparative Example 1. Accordingly, in the electric pump of Comparative Example 2, it can be seen that the oil flow rate value according to the oil pressure is sharply lowered compared to the conventional electric pump in which the motor unit and the pump unit are mechanically separated. Through this, the electric pump including the motor unit and the gear unit serving as the pump unit can reduce the axial length, but it can be confirmed that the loss of hydraulic pressure occurs due to the occurrence of play in the axial direction between the gear unit and the housing.
- Example 2 it can be seen that the flow rate of oil is relatively small even when the pressure of oil is increased compared to Comparative Example 2.
- the flow rate reduction width of Example 1 and the flow rate reduction width of Comparative Example 1 are similar. That is, it can be seen that the Example has a structure similar to that of Comparative Example 2 and there is no significant difference in the pumping performance of the oil from Comparative Example 1.
- the electric pump according to the present invention can maintain the oil pumping performance by reducing the axial length to reduce the size while preventing the occurrence of play in the axial direction between the gear unit and the housing.
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims (10)
- 하우징;상기 하우징에 배치되는 기어부;상기 기어부에 대응되게 배치되는 스테이터; 및상기 기어부와 상기 하우징 사이에 배치되는 지지 부재를 포함하고,상기 기어부는 제1 기어와 상기 제1 기어와 대응되게 배치되는 제2 기어 및 상기 제2 기어에 배치되는 마그넷을 포함하고,상기 지지 부재는 상기 제1 기어를 지지하는 제1 영역과 상기 제1 영역에서 돌출되어 상기 제1 기어에 삽입되는 제2 영역을 포함하는 전동 펌프.
- 제1항에 있어서,상기 제2 영역은 상기 제1 기어를 관통하는 전동 펌프.
- 하우징;상기 하우징에 배치되는 기어부;상기 기어부에 대응되게 배치되는 스테이터;상기 기어부의 상측에 배치되는 커버; 및상기 기어부의 하측과 배치되는 지지 부재를 포함하고,상기 지지 부재는 상기 기어부를 축방향으로 통과하여 상기 커버와 결합되는 제2 영역을 포함하는 전동 펌프.
- 제3항에 있어서,상기 하우징은 상기 커버와 결합되는 전동 펌프.
- 제4항에 있어서,상기 하우징은상기 기어부와 상기 지지 부재를 지지하는 하면과,상기 하면에서 상부로 연장되는 측벽을 포함하는 전동 펌프.
- 몰드 부재;상기 몰드 부재 내에 배치되는 기어부;상기 기어부에 대응되게 배치되는 스테이터; 및상기 기어부와 상기 몰드 부재 사이에 배치되는 금속 재질의 지지 부재를 포함하고,상기 기어부는 제1 기어와 상기 제1 기어와 대응되게 배치되는 제2 기어 및 상기 제2 기어에 배치되는 마그넷을 포함하고,상기 지지 부재의 적어도 일부는 상기 기어부의 하면과 상기 몰드 부재의 일면 사이에 배치되는 전동 펌프.
- 제6항에 있어서,상기 스테이터는 상기 몰드 부재에 매립되는 전동 펌프.
- 제7항에 있어서,상기 몰드 부재는 상기 기어부가 배치되는 수용부를 포함하고,상기 몰드 부재의 상면은 상기 스테이터의 상단보다 높게 배치되는 전동 펌프.
- 제8항에 있어서,상기 기어부의 상측에 배치되는 커버를 포함하고,상기 커버의 적어도 일부는 상기 수용부에 배치되는 전동 펌프.
- 하우징;상기 하우징에 배치되는 기어부;상기 기어부를 구동하는 구동부; 및상기 기어부와 상기 하우징 사이에 배치되는 지지 부재를 포함하고,상기 기어부는 제1 기어와 상기 제1 기어에 대응하여 회전하는 제2 기어를 포함하고,상기 구동부는 상기 제2 기어에 배치되는 마그넷과 상기 마그넷에 대응되게 배치되는 코일을 포함하고,상기 지지 부재는 하우징과 결합하는 제1 영역과 상기 제1 기어와 고정되는 제2 영역을 포함하는 전동 펌프.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/247,977 US12281651B2 (en) | 2020-10-06 | 2021-10-06 | Electric pump |
| CN202180075157.9A CN116420021B (en) | 2020-10-06 | 2021-10-06 | Electric pump |
| EP21877980.9A EP4227534A4 (en) | 2020-10-06 | 2021-10-06 | ELECTRIC PUMP |
| JP2023521389A JP7792402B2 (ja) | 2020-10-06 | 2021-10-06 | 電動ポンプ |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020200128777A KR20220045754A (ko) | 2020-10-06 | 2020-10-06 | 전동 펌프 |
| KR10-2020-0128777 | 2020-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022075729A1 true WO2022075729A1 (ko) | 2022-04-14 |
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ID=81127003
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2021/013665 Ceased WO2022075729A1 (ko) | 2020-10-06 | 2021-10-06 | 전동 펌프 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12281651B2 (ko) |
| EP (1) | EP4227534A4 (ko) |
| JP (1) | JP7792402B2 (ko) |
| KR (1) | KR20220045754A (ko) |
| WO (1) | WO2022075729A1 (ko) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102926694B1 (ko) | 2023-12-11 | 2026-02-13 | 지엠비코리아 주식회사 | 자석의 영향을 감소시키는 전동식 오일펌프 |
Citations (5)
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|---|---|---|---|---|
| JPH08242569A (ja) * | 1995-03-03 | 1996-09-17 | Matsushita Electric Ind Co Ltd | 無整流子モータ |
| US20100290934A1 (en) * | 2009-05-14 | 2010-11-18 | Gil Hadar | Integrated Electrical Auxiliary Oil Pump |
| KR20140145490A (ko) * | 2013-06-13 | 2014-12-23 | 엘지이노텍 주식회사 | 전동 펌프 |
| KR20150081784A (ko) * | 2014-01-07 | 2015-07-15 | 한라비스테온공조 주식회사 | 전동 압축기 및 그 조립 방법 |
| KR20190030889A (ko) * | 2017-09-15 | 2019-03-25 | 엘지이노텍 주식회사 | 전동 펌프 |
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| DE4106060C2 (de) * | 1991-02-27 | 1995-11-30 | Fresenius Ag | Pumpe, insbesondere gekapselte medizinische Pumpe |
| JP2004232578A (ja) | 2003-01-31 | 2004-08-19 | Koyo Seiko Co Ltd | 電動トロコイドポンプ |
| DE102006037177A1 (de) | 2006-08-09 | 2008-02-14 | Robert Bosch Gmbh | Innenzahnradpumpe |
| JP5126588B2 (ja) | 2008-01-08 | 2013-01-23 | アイシン精機株式会社 | 電動ポンプ |
| JP2011058441A (ja) | 2009-09-11 | 2011-03-24 | Jtekt Corp | 電動ポンプユニット |
| JP5564974B2 (ja) | 2009-12-01 | 2014-08-06 | 株式会社ジェイテクト | 電動ポンプ及び電動ポンプの取付け構造 |
| JP2013234597A (ja) | 2012-05-08 | 2013-11-21 | Aisin Seiki Co Ltd | 電動ポンプ |
| ITUB20159726A1 (it) * | 2015-12-22 | 2017-06-22 | Bosch Gmbh Robert | Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna |
| IT201800006043A1 (it) * | 2018-06-05 | 2019-12-05 | Metodo di assemblaggio di una pompa ad ingranaggi |
-
2020
- 2020-10-06 KR KR1020200128777A patent/KR20220045754A/ko active Pending
-
2021
- 2021-10-06 JP JP2023521389A patent/JP7792402B2/ja active Active
- 2021-10-06 US US18/247,977 patent/US12281651B2/en active Active
- 2021-10-06 WO PCT/KR2021/013665 patent/WO2022075729A1/ko not_active Ceased
- 2021-10-06 EP EP21877980.9A patent/EP4227534A4/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08242569A (ja) * | 1995-03-03 | 1996-09-17 | Matsushita Electric Ind Co Ltd | 無整流子モータ |
| US20100290934A1 (en) * | 2009-05-14 | 2010-11-18 | Gil Hadar | Integrated Electrical Auxiliary Oil Pump |
| KR20140145490A (ko) * | 2013-06-13 | 2014-12-23 | 엘지이노텍 주식회사 | 전동 펌프 |
| KR20150081784A (ko) * | 2014-01-07 | 2015-07-15 | 한라비스테온공조 주식회사 | 전동 압축기 및 그 조립 방법 |
| KR20190030889A (ko) * | 2017-09-15 | 2019-03-25 | 엘지이노텍 주식회사 | 전동 펌프 |
Non-Patent Citations (1)
| Title |
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| See also references of EP4227534A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230374983A1 (en) | 2023-11-23 |
| US12281651B2 (en) | 2025-04-22 |
| KR20220045754A (ko) | 2022-04-13 |
| CN116420021A (zh) | 2023-07-11 |
| EP4227534A4 (en) | 2024-04-03 |
| EP4227534A1 (en) | 2023-08-16 |
| JP7792402B2 (ja) | 2025-12-25 |
| JP2023545744A (ja) | 2023-10-31 |
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