US20200347838A1 - Electric oil pump - Google Patents
Electric oil pump Download PDFInfo
- Publication number
- US20200347838A1 US20200347838A1 US16/642,850 US201816642850A US2020347838A1 US 20200347838 A1 US20200347838 A1 US 20200347838A1 US 201816642850 A US201816642850 A US 201816642850A US 2020347838 A1 US2020347838 A1 US 2020347838A1
- Authority
- US
- United States
- Prior art keywords
- housing
- heat dissipating
- oil pump
- electric oil
- dissipating portion
- 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.)
- Abandoned
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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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
-
- 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
-
- 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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- 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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0096—Heating; Cooling
-
- 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
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
-
- 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
- F04C2240/80—Other components
- F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
Definitions
- the present disclosure relates to the field of vehicles, and in particular to a component of a lubrication system and/or a cooling system of a vehicle.
- the electric oil pump is mainly configured to provide a power source for the lubrication system and/or the cooling system of the vehicle, and includes a stator assembly.
- the stator assembly generates heat during operation. If the heat is accumulated to a certain amount and cannot be dissipated in time, it will affect the performance of the stator assembly, thereby reducing the service life of the electric oil pump.
- One object of the present disclosure is to provide an electric oil pump, which facilitates heat dissipation of the stator assembly and thereby facilitates improving the service life of the electric oil pump.
- An electric oil pump which includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly, and an electric control board.
- the pump housing defines a pump cavity, the pump cavity includes a first cavity and a second cavity, the pump rotor assembly is arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board are arranged in the second cavity,
- the pump housing includes a first housing, the first housing includes a side wall, the side wall includes an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, and at least a part of the first heat dissipating portion covers at least a part of an outer circumference of the stator assembly in a circumferential direction of the electric oil pump, which facilitates heat dissipation of the stator assembly and thereby facilitates improving the service life
- An electric oil pump which includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly, and an electric control board.
- the pump housing defines a pump cavity, the pump cavity includes a first cavity and a second cavity, the pump rotor assembly is arranged in the first cavity, the stator assembly, the motor rotor assembly and the electric control board are arranged in the second cavity, the pump housing includes a first housing, the first housing includes a side wall, the side wall includes an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, the first housing includes a hollow portion, a hollow cavity is formed in the hollow portion, the stator assembly and the motor rotor assembly are arranged in the hollow cavity, the stator assembly includes a coil, the coil includes a first top and a first bottom, the first top is closer to the pump rot
- FIG. 1 is a perspective view showing the structure of an electric oil pump according to an embodiment of the present disclosure
- FIG. 2 is a schematic view showing one structure of the electric oil pump in FIG. 1 according to an embodiment
- FIG. 3 is a schematic view showing another structure of the electric oil pump in FIG. 1 according to an embodiment
- FIG. 4 is a top view showing the structure of the electric oil pump in FIG. 1 according to an embodiment
- FIG. 5 is a top view showing the structure of the electric oil pump not assembled with the first housing in FIG. 1 ;
- FIG. 6 is a perspective view showing the structure of the first housing in FIG. 1 according to a first embodiment
- FIG. 7 is a schematic view showing the cross-sectional structure of the first housing not provided with the first heat dissipating portion
- FIG. 8 is a schematic view showing the cross-sectional structure of the first housing in FIG. 6 ;
- FIG. 9 is a partially enlarged schematic view showing the structure of a portion A of the first housing in FIG. 8 ;
- FIG. 10 is a schematic view showing the cross-sectional structure of the first housing in FIG. 1 according to a second embodiment
- FIG. 11 is a perspective view showing the cross-sectional structure of the first housing in FIG. 1 according to a third embodiment
- FIG. 12 is a perspective view showing the cross-sectional structure of the first housing in FIG. 1 according to a forth embodiment
- FIG. 13 is a perspective view showing the structure of the second housing in FIG. 1 ;
- FIG. 14 is a front view showing the structure of a second housing in FIG. 13 ;
- FIG. 15 is a schematic view showing the cross-sectional structure of the second housing in FIG. 13 ;
- FIG. 16 is a perspective view showing the structure of an electric control board in FIG. 2 ;
- FIG. 17 is a schematic view showing the cross-sectional structure of an electric oil pump according to another embodiment of the present disclosure.
- the electric oil pump according to this embodiment is primarily configured to provide flowing power to a working medium of the lubrication system and/or the cooling system of the vehicle, in particular to provide flowing power to the working medium of the lubrication system and/or the cooling system in the vehicle transmission system.
- the electric oil pump 100 includes a pump housing, a motor rotor assembly 3 , a stator assembly 4 , a pump shaft 5 , a pump rotor assembly 8 and an electric control board 6 ;
- the pump housing defines a pump cavity
- the motor rotor assembly 3 , the stator assembly 4 , the pump shaft 5 , the pump rotor assembly 8 , and the electric control board 6 are accommodated in the pump cavity
- the stator assembly 4 includes a stator core 41 and a coil 42 .
- the electric control board 6 is configured to control a current passing through the coil 42 of the stator assembly 4 to change according to a certain law, thereby controlling the stator assembly 4 to generate an ever-changing excitation magnetic field, and the motor rotor assembly 3 is rotated under the effect of the excitation magnetic field.
- the motor rotor assembly 3 drives the pump rotor assembly 8 to rotate.
- the pump rotor assembly 8 rotates, the volume of the pump cavity changes, so that the working medium is pushed out to an outlet to generate flowing power.
- the pump housing includes a pump cover 1 , a first housing 2 and a second housing 7 , and the pump cover 11 , the first housing 2 and the second housing 7 are relatively fixedly connected;
- the pump housing defines a pump cavity, the pump cavity includes a first cavity 80 and a second cavity 90 , the first cavity 80 has a working medium flowing through, and the pump rotor assembly 8 and the electric control board 6 are arranged in the first cavity 80 ;
- the second cavity 90 has no working medium passing through, and the stator assembly 4 , the motor rotor assembly 3 and the electric control board 6 are arranged in the second cavity 90 ; thus, the stator assembly 4 and the electric control board 6 are sufficiently separated from the working medium, thereby ensuring that the performance of the stator assembly and the electric control board is not affected by the working medium.
- the electric oil pump 100 includes a pump rotor assembly 8
- the pump rotor assembly 8 includes an inner rotor 81 and an outer rotor 82 .
- the inner rotor 81 includes multiple external teeth
- the outer rotor 82 includes multiple internal teeth
- a hydraulic cavity 801 is formed between the multiple internal teeth of the outer rotor 82 and the multiple external teeth of the inner rotor 81 .
- the outer rotor 82 is sleeved on an outer circumference of the inner rotor 81 , and a part of the multiple internal teeth of the outer rotor 82 are internally meshed with a part of the multiple external teeth of the inner rotor 81 .
- the electric oil pump includes an inlet 11 and an outlet 12 , and the working medium can enter the hydraulic cavity 801 through the inlet 11 , and then exit the hydraulic cavity 801 through the outlet 12 ; and due to the fact that a part of the multiple external teeth of the inner rotor 81 are meshed with a part of the multiple internal teeth of the outer rotor 82 , the outer rotor 82 is driven to rotate when the inner rotor 81 rotates.
- the internal volume of the hydraulic cavity 801 changes as there is a certain eccentric distance between the inner rotor 81 and the outer rotor 82 .
- the internal volume of the hydraulic cavity 801 is gradually increased to form a partial vacuum, and the working medium is drawn into the hydraulic cavity 801 through the inlet 11 ; and when the pump rotor continues to rotate, the volume of the hydraulic cavity previously filled with the working medium is gradually reduced, and the working medium is squeezed, so that the working medium in the hydraulic cavity 801 is pushed to the outlet 12 , thereby generating the flowing power.
- the pump cover 1 is fixedly connected to the first housing 2
- the first housing 2 is fixedly connected to the second housing 7 .
- the pump cover 1 and the first housing 2 are connected by screws or bolts, such that the electric oil pump is more convenient to disassemble and assemble, thereby facilitating the maintenance of the pump rotor assembly in the electric oil pump.
- the pump cover 1 and the first housing 2 can also be connected by other means, such as plugging-in and snap-fit.
- the first housing 2 is fixedly connected to the second housing 7 , and specifically, the first housing 2 and the second housing 7 are connected by screws or bolts, which, on one hand, renders the electric oil pump more convenient to disassemble and assemble, thereby facilitating the maintenance of the electric control board in the electric oil pump, and on the other hand, renders the connection between the first housing 2 and the second housing 7 more reliable.
- the first housing 2 and the second housing 7 can also be connected by plugging-in, snap-fit or other connection means.
- FIGS. 6, 8 and 9 are schematic views showing the structure of the first housing according to a first embodiment
- FIG. 7 is a schematic view showing the structure of the first housing not provided with a first heat dissipating portion.
- the first housing according to the first embodiment will be described hereinafter.
- the first housing 2 includes a side wall 21 including an inner surface 211 and an outer surface 212 .
- the inner surface 211 is arranged in contact with at least a part of an outer wall of the stator assembly 4
- the outer surface 212 is provided with a first heat dissipating portion 26 , at least a part of the first heat dissipating portion 26 covers at least a part of an outer circumference of the stator assembly 4 in a circumferential direction of the electric oil pump.
- the first housing 2 includes a hollow portion 22 , and the hollow cavity 221 is formed in the hollow portion.
- the hollow portion 22 includes a first surface 222 and a second surface 223 , the first surface 222 is a top surface of the hollow portion 22 , and the second surface 223 is a bottom surface of the hollow portion.
- the first surface 222 is closer to the pump rotor assembly 8 than the second surface 223 .
- a first reference surface is defined to have a central axis coinciding with that of the first surface 222 and coincide with the first surface
- a second reference surface is defined to have a central axis coinciding with that of the second surface 223 and coincide with the second surface 223 .
- at least a part of the longitudinal distribution region of the first heat dissipating portion 26 is located between the first reference surface and the second reference surface along a central axis direction of the electric oil pump.
- the coil 42 includes a first top 421 and a first bottom 422 , the first top 421 is closer to the pump rotor assembly 8 than the first bottom 422 , the first heat dissipating portion 26 includes a start portion 264 and an end portion 263 , along the central axis direction of the electric oil pump 100 , the start portion 264 is closer to the pump rotor assembly 8 in FIG. 3 than the end portion 263 ; along the central axis direction of the electric oil pump 100 , the first top 421 of the coil 42 in FIG.
- FIG. 7 is a schematic view showing the structure of the first housing not provided with the first heat dissipating portion on the outer surface. Given a defined surface K, the defined surface K is an outer surface not provided with the first heat dissipating portion 26 , and the outer surface 2121 in FIG. 7 may be fitted to FIG.
- the first heat dissipating portion 26 includes multiple convex portions 262 which protrude away from a central axis of the first housing 2 .
- the convex portions 262 so protrude away from the outer surface 212 as to be tangent to the defined surface K. In this way, a heat dissipation area of the first housing 2 is increased by such means as equivalent to peeling, thereby facilitating heat dissipation of the stator assembly and the electric control board.
- the convex portions 262 are spaced apart or continuously distributed along the central axis direction of the first housing 2 .
- the first heat dissipating portion 26 further includes multiple concave portions 261 , the multiple concave portions 261 are concaved from the outer surface 212 toward the central axis of the first housing 2 , and the convex portions 262 and the concave portions 261 are distributed along the axial direction of the electric oil pump.
- the convex portions 262 are spaced apart from each other along the central axis direction of the first housing 2 , where the term “spaced apart” means that the concave portions 261 and the convex portions 262 are alternately arranged, that is, a convex portion 262 is provided between each two adjacent concave portions 261 , or a concave portion 261 is provided between each two adjacent convex portions 262 .
- the concave portions 261 are arranged along the axial direction of the electric oil pump, so that the heat dissipation area is maximized, which facilitates the heat dissipation of the stator assembly 4 and the electric control board 6 in FIG. 2 , thereby facilitating improving the service life of the electric oil pump.
- the convex portions 262 can also be continuously distributed along the central axis direction of the first housing 2 , where the term “continuously distributed” means that the convex portions 262 are connected end to end.
- the multiple convex portions 262 have the same convex height, a wall thickness H 1 of the first housing 2 at the convex portion 262 is larger than or equal to 1.5 times the convex height of the convex portion 262 , which can ensure the mechanical strength of the side wall 21 of the first housing 2 at the convex portions 262 ; and a wall thickness H 2 of the first housing 2 at the concave portion 261 of the first heat dissipating portion 26 is larger than or equal to 0.5 times a concave depth H 3 of the concave portion 261 , which can ensure the mechanical strength of the side wall of the first housing 2 at the concave portions 261 .
- a vertical distance between the inner surface 211 and the outer surface 212 is defined as a first distance H 1 , that is, the wall thickness of the first housing 2 at the convex portion 262 , the concave portion 261 includes a head portion 2611 and a tail portion 2612 , the tail portion 2612 is closer to the central axis of the first housing 2 than the head portion 2611 , a vertical distance between the tail portion 2612 and the inner surface 211 is defined as a second distance H 2 , and a ratio of the second distance H 2 to the first distance H 1 is larger than or equal to one third, which can ensure the strength of the side wall 21 of the first housing 2 at the first heat dissipating portion 26 , causing the side wall of the first housing to be broken due to insufficient mechanical strength.
- a convex portion 262 or a concave portion 261 located at the start portion 264 of the first heat dissipating portion 26 is in smooth transitional connection with the outer surface 212 , and an included angle between a side wall of the convex portion 262 or the concave portion 261 located at the start portion 264 of the first heat dissipating portion 26 and the outer surface 212 is larger than 90°, so that the transition portion has no sharp corners, thereby facilitating reducing the stress concentration at the transition portion.
- a convex portion 262 or a concave portion 261 located at the end portion 263 of the first heat dissipating portion 26 is in smooth transitional connection with the outer surface, and an included angle between a side wall of the convex portion 262 or the concave portion 261 at the end portion 263 of the first heat dissipating portion 26 and the outer surface is larger than 90°, so that the transition portion has no sharp corners, thereby facilitating reducing the stress concentration at the transition portion.
- the stator assembly 4 includes a stator core 41 , a side of the stator core 41 closer to the pump rotor assembly 8 is defined as an upper side, and a side of the stator core 41 closer to the electric control board 6 is defined as a lower side.
- the start portion 264 of the first heat dissipating portion 26 is located above the stator core 41 in FIG.
- the end portion 263 of the first heat dissipating portion 26 is located below two thirds of the stator core 41 , such that the first heat dissipating portion 26 can be provided encompassing as much as possible of the stator core 41 , thereby facilitating heat dissipation of the stator assembly 4 .
- the first housing 2 includes a second top 23 and a second bottom 24 .
- the second top 23 is closer to the pump rotor assembly 8 than the second bottom 24 , in the axial direction of the electric oil pump, the stator assembly 4 is at least partially overlapped with the first heat dissipating portion 26 , that is, at least a part of the first heat dissipating portion 26 covers at least a part of the outer circumference of the stator assembly 4 , and along the central axis direction of the electric oil pump, at least a part of the longitudinal distribution region of the first heat dissipating portion 26 is located between the second top 23 and the second bottom 24 , such that the heat generated by the coil 42 during operation of the stator assembly 4 in FIG.
- the concave portion 261 located at the start portion 264 of the first heat dissipating portion 26 is defined as a first concave portion, and the first concave portion is located above the first top 421 of the coil 42 , where in practice, it may be a convex portion 262 that is located at the start portion 264 ; and the concave portion 261 located at the end portion 263 of the first heat dissipating portion 26 is defined as an end concave portion, and the end concave portion is located below the first top 421 of the coil 42 , where in practice, it may be a convex portion that is located at the end portion.
- a vertical distance L between a central axis of the end concave portion and a central axis of the first concave portion is larger than or equal to a vertical distance H 4 between the first top 421 and the first bottom 422 of the coil 42 in FIG.
- the first heat dissipating portion 26 axially covers the coil 42 and more above, which can ensure that the heat generated by the coil in FIG. 3 can be uniformly dissipated through the first heat dissipating portion, thereby improving heat dissipation efficiency.
- the first housing 2 is made of a metal material, and the first housing 2 further includes a first groove 27 and a second groove 28 , and the first heat dissipating portion 26 is located between the first groove 27 and the second groove 28 .
- the electric oil pump further includes a first annular seal ring 30 and a second annular seal ring 40 .
- the first annular seal ring 30 is sleeved on the first groove 27
- the second annular seal ring 40 is sleeved on the second groove 28 .
- the first heat dissipating portion 26 is located between the first annular seal ring 30 and the second annular seal ring 40 .
- the first annular seal ring 30 and the second annular seal ring 40 facilitate preventing a high-pressure oil medium from entering the region where the first heat dissipating portion 26 is located.
- an external cold medium can be introduced in contact with the first heat dissipating portion 26 , thereby making the heat dissipation of the coil more efficient.
- the concave portions 261 and the convex portions 262 are circumferentially arranged along a circumferential direction of the outer surface 21 of the first housing 2 , and the concave portions 261 and the convex portions 262 of the first heat dissipating portion 26 are arranged in an array or evenly distributed along the central axis of the first housing 2 , which facilitates increasing an area of the first heat dissipating portion, thereby facilitating the heat dissipation of the coil.
- the concave portions 261 and the convex portions 262 of the first heat dissipating portion 26 are both provided occupying an entire circle along the circumferential direction of the outer surface of the first housing 2 , while in practice, the concave portions 261 and the convex portions 262 of the first heat dissipating portion 26 may also be provided occupying less than one circle along the circumferential direction of the outer surface 21 of the first housing 2 .
- the first housing 2 is longitudinally cut along the axial direction to obtain a longitudinal section.
- the first heat dissipating portion 26 has a wave-like shape.
- the first heat dissipating portion 26 may also has a wave-like shape composed of other geometries such as rectangles, triangles, or trapezoids.
- first housing 2 a The structure of the first housing according to the other three embodiments will be described below.
- first housing 2 a the first housing of a second embodiment is labeled as first housing 2 a, and the other legends are suffixed by a;
- first housing of a third embodiment is labeled as first housing 2 b, and the other legends are suffixed by b;
- first housing of a fourth embodiment is labeled as first housing 2 c, and the other legends are suffixed by c.
- FIG. 10 is a schematic view showing the structure of the first housing according to the second embodiment, and the structure of the first housing according to the second embodiment will be described below.
- the first housing 2 a includes a first heat dissipating portion 26 a.
- An area of a projection of the first heat dissipating portion 26 a onto an outer surface 212 a of a corresponding side wall 21 a is referred to as a first area
- a surface area of the first heat dissipating portion 26 a is referred to as a second area
- the second area is larger than or equal to the first area.
- the defined surface K′ is an outer surface not provided with the first heat dissipating portion 26 a
- the first area is a surface area of the defined surface K′
- the outer surface 212 ′ in FIG. 7 is fitted to FIG.
- the first heat dissipating portion 26 a includes multiple convex portions 262 a, and the multiple convex portions 262 a are arranged protruding away from the defined surface K′.
- the first heat dissipating portion 26 a is directly provided on the bare outer surface in this embodiment instead of by means of peeling, thereby increasing a heat dissipating area of the first housing 2 , which facilitates the heat dissipation of the stator assembly and the electric control board.
- FIG. 11 is a schematic view showing the structure of the first housing according to the third embodiment, and the structure of the first housing according to the third embodiment will be described below.
- the first housing 2 b includes a first heat dissipating portion 26 b.
- the first heat dissipating portion 26 b includes multiple convex portions 262 b, and the convex portions 262 b are arranged protruding away from an outer surface 212 b.
- the multiple convex portions 262 b are continuously arranged along an axial direction of the first housing 2 b, where the term “continuously arranged” means that each two adjacent convex portions 212 b are connected end to end.
- the convex portions 262 b have the same convex height, and a corresponding wall thickness of the first housing 2 at a corresponding convex portion 262 b is larger than or equal to 1.5 times the convex height of the corresponding convex portion 262 b.
- the first heat dissipation 26 b in this embodiment only includes the convex portions 262 b, and does not include any concave portions, which also facilitates relatively increasing an area of the outer surface and thereby the heat dissipation area of the first heat dissipating portion 26 b, thereby facilitating the heat dissipation of the stator assembly and the electric control board.
- FIG. 12 is a schematic view showing the structure of the first housing according to the fourth embodiment, and the structure of the first housing according to the fourth embodiment will be described below.
- the first housing 2 c includes a first heat dissipating portion 26 c.
- the first heat dissipating portion 26 c includes multiple concave portions 261 c.
- the concave portions 261 c are concaved from an outer surface 212 c toward a central axis of the first housing 2 c.
- the concave portions 261 c are continuously arranged in an axial direction of the first housing 2 c, where the term “continuously arranged” means that the each two adjacent concave portions 261 c are connected end to end.
- a corresponding wall thickness of the first housing 2 c at a corresponding concave portion 261 c of the first heat dissipating portion 26 c is larger than or equal to 0.5 times a concave depth of the corresponding concave portion 261 c.
- the first heat dissipating portion 26 c includes only the concave portions 261 c, and does not include any convex portions, which also facilitates relatively increasing an area of the outer surface and thereby the heat dissipation area of the first heat dissipating portion, thereby facilitating the heat dissipation of the stator assembly and the electric control board.
- the electric oil pump further includes a second housing 7 , and the second housing 7 is fixedly connected to the first housing 2 .
- FIGS. 13 to 15 are schematic views showing the structure of the second housing.
- the second housing includes multiple convex ribs 74 , and the convex ribs 74 and the second housing 7 are fixedly connected to each other or formed as one piece.
- the convex ribs 74 are integrally formed with the second housing 7 by injection molding.
- the convex ribs 74 are arranged protruding away from the first housing 2
- the second housing 7 includes a plug 76 .
- FIG. 13 to 15 are schematic views showing the structure of the second housing.
- the second housing includes multiple convex ribs 74 , and the convex ribs 74 and the second housing 7 are fixedly connected to each other or formed as one piece.
- the convex ribs 74 are integrally formed with the second housing 7 by injection molding.
- the convex ribs 74 are
- the plug 76 is arranged protruding away from the first housing 2 .
- a region of the second housing 7 covered by the convex ribs is referred to as a first region, and an area of the first region is a third area.
- the electric control board 6 includes a substrate 61 and a heat-generating electric element 62 , and the heat-generating electric element 62 is arranged on the substrate 61 .
- a region of the substrate 61 covered by the heat-generating electric element 62 is referred to as a second region, and an area of the second region is a fourth area.
- the first region and the second regions are correspondingly arranged.
- At least a part of a vertical projection of the first region is overlapped with at least a part of a vertical projection of the second region and the third area is larger than or equal to the fourth area, by which it is sufficiently ensured that the heat generated by the heat-generating electric element 62 provided on the substrate 61 can be timely dissipated through the convex ribs in a short time, thereby reducing the influence of heat generated by the heat-generating electric element on the performance of the electric control board.
- the second housing 7 further includes a first side wall 75 .
- the convex ribs 74 are arranged substantially parallel to the first side wall 75 , where the term “substantially parallel” means a depth of parallelism of the convex ribs 74 is within 0.5 mm with the first side wall 75 serving as a reference surface, such that it can be ensured that as many convex ribs 74 as possible can be provided on the second housing, thereby increasing the heat dissipation area and facilitating the heat dissipation of the circuit board.
- the convex ribs 74 can also be arranged at an angle with the first side wall 75 .
- a shape of a transverse section of the convex rib 74 is a rectangle, while in practice, the transverse section of the convex rib may also have other shapes, such as a trapezoid, a triangle, and an arc.
- FIG. 17 is a schematic view showing the structure of an electric oil pump according to another embodiment.
- the electric oil pump 100 ′ includes a pump housing, and the pump housing includes a pump cover 1 , a first housing 2 and a second housing 7 , where the pump cover 1 , the first housing 2 and the second housing 7 are relatively fixedly connected.
- the pump housing defines a pump cavity, and the pump cavity includes a first cavity 80 and a second cavity 90 , the first cavity 80 has a working medium flowing through, and a pump rotor assembly 8 and an electric control board 6 are provided in the first cavity 80 ; and the second cavity 90 has a working medium passing through, a stator assembly 4 , a motor rotor assembly 3 and an electric control board 6 are provided in the second cavity 90 .
- the electric oil pump 100 ′ further includes a pump shaft 5 ′, the pump shaft 5 ′ includes a shaft hole 50 which connects the working media of the first cavity 80 and the second cavity 90 to each other, such that the working medium in the first cavity can flow into the second cavity through the shaft hole 50 .
- the second cavity of the electric oil pump according to this embodiment has a working medium passing through, so that the working medium in the second cavity can also take away a part of heat generated by the stator assembly 4 during operation, which better facilitates heat dissipation of the stator assembly.
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Abstract
Description
- This application is a national stage filing under 35 U.S.C. § 371 of International Patent Application Serial No. PCT/CN2018/090337, filed Jun. 8, 2018, which claims the priority to Chinese patent application No. 201710770143.4 titled “ELECTRIC OIL PUMP”, filed with the China National Intellectual Property Administration on Aug. 31, 2017. The contents of these applications are incorporated herein by reference in their entirety.
- The present disclosure relates to the field of vehicles, and in particular to a component of a lubrication system and/or a cooling system of a vehicle.
- With the development of vehicle performance towards safer, more reliable, more stable, fully automatic and intelligent, environmentally-friendly and energy saving, electric oil pumps are widely used in lubrication systems and/or cooling systems of vehicles, and can well meet market requirements.
- The electric oil pump is mainly configured to provide a power source for the lubrication system and/or the cooling system of the vehicle, and includes a stator assembly. Usually, the stator assembly generates heat during operation. If the heat is accumulated to a certain amount and cannot be dissipated in time, it will affect the performance of the stator assembly, thereby reducing the service life of the electric oil pump.
- One object of the present disclosure is to provide an electric oil pump, which facilitates heat dissipation of the stator assembly and thereby facilitates improving the service life of the electric oil pump.
- In order to achieve the above object, the following technical solutions are provided according to some embodiments of the present disclosure.
- An electric oil pump is provided, which includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly, and an electric control board. The pump housing defines a pump cavity, the pump cavity includes a first cavity and a second cavity, the pump rotor assembly is arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board are arranged in the second cavity, the pump housing includes a first housing, the first housing includes a side wall, the side wall includes an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, and at least a part of the first heat dissipating portion covers at least a part of an outer circumference of the stator assembly in a circumferential direction of the electric oil pump, which facilitates heat dissipation of the stator assembly and thereby facilitates improving the service life of the electric oil pump.
- An electric oil pump is provided, which includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly, and an electric control board. The pump housing defines a pump cavity, the pump cavity includes a first cavity and a second cavity, the pump rotor assembly is arranged in the first cavity, the stator assembly, the motor rotor assembly and the electric control board are arranged in the second cavity, the pump housing includes a first housing, the first housing includes a side wall, the side wall includes an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, the first housing includes a hollow portion, a hollow cavity is formed in the hollow portion, the stator assembly and the motor rotor assembly are arranged in the hollow cavity, the stator assembly includes a coil, the coil includes a first top and a first bottom, the first top is closer to the pump rotor assembly than the first bottom, the first heat dissipating portion includes a start portion and an end portion along a central axis direction of the electric oil pump, the start portion is closer to the pump rotor assembly than the end portion, and the first top is closer to the pump rotor assembly than the end portion of the first heat dissipating portion along the central axis direction of the electric oil pump, which facilitates heat dissipation of the stator assembly and thereby facilitates improving the service life of the electric oil pump.
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FIG. 1 is a perspective view showing the structure of an electric oil pump according to an embodiment of the present disclosure; -
FIG. 2 is a schematic view showing one structure of the electric oil pump inFIG. 1 according to an embodiment; -
FIG. 3 is a schematic view showing another structure of the electric oil pump inFIG. 1 according to an embodiment; -
FIG. 4 is a top view showing the structure of the electric oil pump inFIG. 1 according to an embodiment; -
FIG. 5 is a top view showing the structure of the electric oil pump not assembled with the first housing inFIG. 1 ; -
FIG. 6 is a perspective view showing the structure of the first housing inFIG. 1 according to a first embodiment; -
FIG. 7 is a schematic view showing the cross-sectional structure of the first housing not provided with the first heat dissipating portion; -
FIG. 8 is a schematic view showing the cross-sectional structure of the first housing inFIG. 6 ; -
FIG. 9 is a partially enlarged schematic view showing the structure of a portion A of the first housing inFIG. 8 ; -
FIG. 10 is a schematic view showing the cross-sectional structure of the first housing inFIG. 1 according to a second embodiment; -
FIG. 11 is a perspective view showing the cross-sectional structure of the first housing inFIG. 1 according to a third embodiment; -
FIG. 12 is a perspective view showing the cross-sectional structure of the first housing inFIG. 1 according to a forth embodiment; -
FIG. 13 is a perspective view showing the structure of the second housing inFIG. 1 ; -
FIG. 14 is a front view showing the structure of a second housing inFIG. 13 ; -
FIG. 15 is a schematic view showing the cross-sectional structure of the second housing inFIG. 13 ; -
FIG. 16 is a perspective view showing the structure of an electric control board inFIG. 2 ; -
FIG. 17 is a schematic view showing the cross-sectional structure of an electric oil pump according to another embodiment of the present disclosure. - The present disclosure will be further described below in conjunction with the drawings and specific embodiments.
- The electric oil pump according to this embodiment is primarily configured to provide flowing power to a working medium of the lubrication system and/or the cooling system of the vehicle, in particular to provide flowing power to the working medium of the lubrication system and/or the cooling system in the vehicle transmission system.
- Referring to
FIGS. 1 to 3 , theelectric oil pump 100 includes a pump housing, amotor rotor assembly 3, astator assembly 4, apump shaft 5, apump rotor assembly 8 and anelectric control board 6; the pump housing defines a pump cavity, themotor rotor assembly 3, thestator assembly 4, thepump shaft 5, thepump rotor assembly 8, and theelectric control board 6 are accommodated in the pump cavity, and thestator assembly 4 includes astator core 41 and acoil 42. When theelectric oil pump 100 is in operation, theelectric control board 6 is configured to control a current passing through thecoil 42 of thestator assembly 4 to change according to a certain law, thereby controlling thestator assembly 4 to generate an ever-changing excitation magnetic field, and themotor rotor assembly 3 is rotated under the effect of the excitation magnetic field. Themotor rotor assembly 3 drives thepump rotor assembly 8 to rotate. When thepump rotor assembly 8 rotates, the volume of the pump cavity changes, so that the working medium is pushed out to an outlet to generate flowing power. - Referring to
FIGS. 1 to 3 , in the embodiment, the pump housing includes a pump cover 1, afirst housing 2 and asecond housing 7, and thepump cover 11, thefirst housing 2 and thesecond housing 7 are relatively fixedly connected; the pump housing defines a pump cavity, the pump cavity includes afirst cavity 80 and asecond cavity 90, thefirst cavity 80 has a working medium flowing through, and thepump rotor assembly 8 and theelectric control board 6 are arranged in thefirst cavity 80; thesecond cavity 90 has no working medium passing through, and thestator assembly 4, themotor rotor assembly 3 and theelectric control board 6 are arranged in thesecond cavity 90; thus, thestator assembly 4 and theelectric control board 6 are sufficiently separated from the working medium, thereby ensuring that the performance of the stator assembly and the electric control board is not affected by the working medium. - Referring to
FIGS. 2 and 5 , in this embodiment, theelectric oil pump 100 includes apump rotor assembly 8, and thepump rotor assembly 8 includes aninner rotor 81 and anouter rotor 82. Theinner rotor 81 includes multiple external teeth, theouter rotor 82 includes multiple internal teeth, and ahydraulic cavity 801 is formed between the multiple internal teeth of theouter rotor 82 and the multiple external teeth of theinner rotor 81. In this embodiment, theouter rotor 82 is sleeved on an outer circumference of theinner rotor 81, and a part of the multiple internal teeth of theouter rotor 82 are internally meshed with a part of the multiple external teeth of theinner rotor 81. Referring again toFIGS. 1 to 5 , the electric oil pump includes aninlet 11 and anoutlet 12, and the working medium can enter thehydraulic cavity 801 through theinlet 11, and then exit thehydraulic cavity 801 through theoutlet 12; and due to the fact that a part of the multiple external teeth of theinner rotor 81 are meshed with a part of the multiple internal teeth of theouter rotor 82, theouter rotor 82 is driven to rotate when theinner rotor 81 rotates. During the process that thepump rotor 8 rotates for one circle, the internal volume of thehydraulic cavity 801 changes as there is a certain eccentric distance between theinner rotor 81 and theouter rotor 82. Specifically, as thepump rotor 8 rotates from a start portion to a certain angle, the internal volume of thehydraulic cavity 801 is gradually increased to form a partial vacuum, and the working medium is drawn into thehydraulic cavity 801 through theinlet 11; and when the pump rotor continues to rotate, the volume of the hydraulic cavity previously filled with the working medium is gradually reduced, and the working medium is squeezed, so that the working medium in thehydraulic cavity 801 is pushed to theoutlet 12, thereby generating the flowing power. - Referring to
FIGS. 1 to 3 , the pump cover 1 is fixedly connected to thefirst housing 2, and thefirst housing 2 is fixedly connected to thesecond housing 7. In the embodiment, the pump cover 1 and thefirst housing 2 are connected by screws or bolts, such that the electric oil pump is more convenient to disassemble and assemble, thereby facilitating the maintenance of the pump rotor assembly in the electric oil pump. In practice, the pump cover 1 and thefirst housing 2 can also be connected by other means, such as plugging-in and snap-fit. Thefirst housing 2 is fixedly connected to thesecond housing 7, and specifically, thefirst housing 2 and thesecond housing 7 are connected by screws or bolts, which, on one hand, renders the electric oil pump more convenient to disassemble and assemble, thereby facilitating the maintenance of the electric control board in the electric oil pump, and on the other hand, renders the connection between thefirst housing 2 and thesecond housing 7 more reliable. In practice thefirst housing 2 and thesecond housing 7 can also be connected by plugging-in, snap-fit or other connection means. - Referring to
FIGS. 6 to 9 ,FIGS. 6, 8 and 9 are schematic views showing the structure of the first housing according to a first embodiment, andFIG. 7 is a schematic view showing the structure of the first housing not provided with a first heat dissipating portion. The first housing according to the first embodiment will be described hereinafter. - Referring to
FIGS. 6 to 9 , thefirst housing 2 includes aside wall 21 including aninner surface 211 and anouter surface 212. In conjunction withFIG. 2 , at least a part of theinner surface 211 is arranged in contact with at least a part of an outer wall of thestator assembly 4, theouter surface 212 is provided with a firstheat dissipating portion 26, at least a part of the firstheat dissipating portion 26 covers at least a part of an outer circumference of thestator assembly 4 in a circumferential direction of the electric oil pump. In this way, at least a part of a longitudinal distribution region of the firstheat dissipating portion 26 is arranged corresponding to ahollow cavity 221 in an axial direction of the electric oil pump, which can facilitate heat dissipation of the stator assembly and the electric control board, thereby facilitating improving the service life of the electric oil pump. Thefirst housing 2 includes ahollow portion 22, and thehollow cavity 221 is formed in the hollow portion. The stator assembly and the motor rotor assembly inFIG. 2 are arranged in thehollow cavity 221, and at least a part of the longitudinal distribution region of the firstheat dissipating portion 26 is located in a portion of thefirst housing 2 corresponding to thehollow cavity 221, such that at least a part of the longitudinal distribution region of the firstheat dissipating portion 26 is arranged corresponding to at least a part of thefirst housing 2 corresponding to thehollow cavity 221, which facilitates the heat dissipation of the stator assembly and the electric control board. Specifically, thehollow portion 22 includes afirst surface 222 and asecond surface 223, thefirst surface 222 is a top surface of thehollow portion 22, and thesecond surface 223 is a bottom surface of the hollow portion. In conjunction withFIG. 2 , thefirst surface 222 is closer to thepump rotor assembly 8 than thesecond surface 223. A first reference surface is defined to have a central axis coinciding with that of thefirst surface 222 and coincide with the first surface, and a second reference surface is defined to have a central axis coinciding with that of thesecond surface 223 and coincide with thesecond surface 223. In conjunction withFIG. 2 or 3 , at least a part of the longitudinal distribution region of the firstheat dissipating portion 26 is located between the first reference surface and the second reference surface along a central axis direction of the electric oil pump. - Referring to
FIGS. 3 and 8 , thecoil 42 includes a first top 421 and afirst bottom 422, the first top 421 is closer to thepump rotor assembly 8 than thefirst bottom 422, the firstheat dissipating portion 26 includes astart portion 264 and anend portion 263, along the central axis direction of theelectric oil pump 100, thestart portion 264 is closer to thepump rotor assembly 8 inFIG. 3 than theend portion 263; along the central axis direction of theelectric oil pump 100, thefirst top 421 of thecoil 42 inFIG. 3 is closer to thepump rotor assembly 8 than theend portion 263 of the firstheat dissipating portion 26, that is, theend portion 263 of the firstheat dissipating portion 26 is located below thefirst top 421 of thecoil 42 inFIG. 3 . - Referring to
FIGS. 8 and 9 , an area of a projection of the firstheat dissipating portion 26 onto theouter surface 212 of acorresponding side wall 21 is referred to as a first area, a surface area of the firstheat dissipating portion 26 is referred to as a second area, and the second area is larger than or equal to the first area. Referring toFIG. 7 again,FIG. 7 is a schematic view showing the structure of the first housing not provided with the first heat dissipating portion on the outer surface. Given a defined surface K, the defined surface K is an outer surface not provided with the firstheat dissipating portion 26, and theouter surface 2121 inFIG. 7 may be fitted toFIG. 8 to obtain the defined surface K (indicated by the dashed line inFIG. 8 ). The firstheat dissipating portion 26 includes multipleconvex portions 262 which protrude away from a central axis of thefirst housing 2. In particular, theconvex portions 262 so protrude away from theouter surface 212 as to be tangent to the defined surface K. In this way, a heat dissipation area of thefirst housing 2 is increased by such means as equivalent to peeling, thereby facilitating heat dissipation of the stator assembly and the electric control board. - The
convex portions 262 are spaced apart or continuously distributed along the central axis direction of thefirst housing 2. Specifically, referring toFIGS. 8 and 9 , in this embodiment, the firstheat dissipating portion 26 further includes multipleconcave portions 261, the multipleconcave portions 261 are concaved from theouter surface 212 toward the central axis of thefirst housing 2, and theconvex portions 262 and theconcave portions 261 are distributed along the axial direction of the electric oil pump. Specifically, theconvex portions 262 are spaced apart from each other along the central axis direction of thefirst housing 2, where the term “spaced apart” means that theconcave portions 261 and theconvex portions 262 are alternately arranged, that is, aconvex portion 262 is provided between each two adjacentconcave portions 261, or aconcave portion 261 is provided between each two adjacentconvex portions 262. In this case, theconcave portions 261 are arranged along the axial direction of the electric oil pump, so that the heat dissipation area is maximized, which facilitates the heat dissipation of thestator assembly 4 and theelectric control board 6 inFIG. 2 , thereby facilitating improving the service life of the electric oil pump. In practice, theconvex portions 262 can also be continuously distributed along the central axis direction of thefirst housing 2, where the term “continuously distributed” means that theconvex portions 262 are connected end to end. - Referring to
FIGS. 8 and 9 , in the embodiment, the multipleconvex portions 262 have the same convex height, a wall thickness H1 of thefirst housing 2 at theconvex portion 262 is larger than or equal to 1.5 times the convex height of theconvex portion 262, which can ensure the mechanical strength of theside wall 21 of thefirst housing 2 at theconvex portions 262; and a wall thickness H2 of thefirst housing 2 at theconcave portion 261 of the firstheat dissipating portion 26 is larger than or equal to 0.5 times a concave depth H3 of theconcave portion 261, which can ensure the mechanical strength of the side wall of thefirst housing 2 at theconcave portions 261. Specifically, a vertical distance between theinner surface 211 and theouter surface 212 is defined as a first distance H1, that is, the wall thickness of thefirst housing 2 at theconvex portion 262, theconcave portion 261 includes ahead portion 2611 and atail portion 2612, thetail portion 2612 is closer to the central axis of thefirst housing 2 than thehead portion 2611, a vertical distance between thetail portion 2612 and theinner surface 211 is defined as a second distance H2, and a ratio of the second distance H2 to the first distance H1 is larger than or equal to one third, which can ensure the strength of theside wall 21 of thefirst housing 2 at the firstheat dissipating portion 26, causing the side wall of the first housing to be broken due to insufficient mechanical strength. - Referring to
FIGS. 8 and 9 , aconvex portion 262 or aconcave portion 261 located at thestart portion 264 of the firstheat dissipating portion 26 is in smooth transitional connection with theouter surface 212, and an included angle between a side wall of theconvex portion 262 or theconcave portion 261 located at thestart portion 264 of the firstheat dissipating portion 26 and theouter surface 212 is larger than 90°, so that the transition portion has no sharp corners, thereby facilitating reducing the stress concentration at the transition portion. Aconvex portion 262 or aconcave portion 261 located at theend portion 263 of the firstheat dissipating portion 26 is in smooth transitional connection with the outer surface, and an included angle between a side wall of theconvex portion 262 or theconcave portion 261 at theend portion 263 of the firstheat dissipating portion 26 and the outer surface is larger than 90°, so that the transition portion has no sharp corners, thereby facilitating reducing the stress concentration at the transition portion. - Referring to
FIGS. 2, 3 and 8 , thestator assembly 4 includes astator core 41, a side of thestator core 41 closer to thepump rotor assembly 8 is defined as an upper side, and a side of thestator core 41 closer to theelectric control board 6 is defined as a lower side. In an axial direction of thefirst housing 2, thestart portion 264 of the firstheat dissipating portion 26 is located above thestator core 41 inFIG. 3 , and theend portion 263 of the firstheat dissipating portion 26 is located below two thirds of thestator core 41, such that the firstheat dissipating portion 26 can be provided encompassing as much as possible of thestator core 41, thereby facilitating heat dissipation of thestator assembly 4. - Referring to
FIGS. 6 to 9 , thefirst housing 2 includes a second top 23 and asecond bottom 24. In conjunction withFIG. 2 or 3 , the second top 23 is closer to thepump rotor assembly 8 than the second bottom 24, in the axial direction of the electric oil pump, thestator assembly 4 is at least partially overlapped with the firstheat dissipating portion 26, that is, at least a part of the firstheat dissipating portion 26 covers at least a part of the outer circumference of thestator assembly 4, and along the central axis direction of the electric oil pump, at least a part of the longitudinal distribution region of the firstheat dissipating portion 26 is located between the second top 23 and the second bottom 24, such that the heat generated by thecoil 42 during operation of thestator assembly 4 inFIG. 2 can be dissipated through the firstheat dissipating portion 26 as soon as possible. Theconcave portion 261 located at thestart portion 264 of the firstheat dissipating portion 26 is defined as a first concave portion, and the first concave portion is located above thefirst top 421 of thecoil 42, where in practice, it may be aconvex portion 262 that is located at thestart portion 264; and theconcave portion 261 located at theend portion 263 of the firstheat dissipating portion 26 is defined as an end concave portion, and the end concave portion is located below thefirst top 421 of thecoil 42, where in practice, it may be a convex portion that is located at the end portion. In this way, it is ensured that at least a part of an axial projection of the longitudinal region between the first concave portion and the end concave portion is overlapped with at least a part of an axial projection of the longitudinal region of the stator assembly along the axial direction of the electric oil pump, thereby facilitating heat dissipation of the stator assembly. Referring toFIG. 8 , a vertical distance L between a central axis of the end concave portion and a central axis of the first concave portion is larger than or equal to a vertical distance H4 between the first top 421 and thefirst bottom 422 of thecoil 42 inFIG. 3 , that is, the firstheat dissipating portion 26 axially covers thecoil 42 and more above, which can ensure that the heat generated by the coil inFIG. 3 can be uniformly dissipated through the first heat dissipating portion, thereby improving heat dissipation efficiency. - Referring to
FIG. 8 , thefirst housing 2 is made of a metal material, and thefirst housing 2 further includes afirst groove 27 and asecond groove 28, and the firstheat dissipating portion 26 is located between thefirst groove 27 and thesecond groove 28. In conjunction withFIG. 2 , the electric oil pump further includes a firstannular seal ring 30 and a secondannular seal ring 40. The firstannular seal ring 30 is sleeved on thefirst groove 27, and the secondannular seal ring 40 is sleeved on thesecond groove 28. The firstheat dissipating portion 26 is located between the firstannular seal ring 30 and the secondannular seal ring 40. When the electric oil pump is mounted in an automobile transmission system, the firstannular seal ring 30 and the secondannular seal ring 40 facilitate preventing a high-pressure oil medium from entering the region where the firstheat dissipating portion 26 is located. In this case, an external cold medium can be introduced in contact with the firstheat dissipating portion 26, thereby making the heat dissipation of the coil more efficient. Referring toFIGS. 6 to 10 , theconcave portions 261 and theconvex portions 262 are circumferentially arranged along a circumferential direction of theouter surface 21 of thefirst housing 2, and theconcave portions 261 and theconvex portions 262 of the firstheat dissipating portion 26 are arranged in an array or evenly distributed along the central axis of thefirst housing 2, which facilitates increasing an area of the first heat dissipating portion, thereby facilitating the heat dissipation of the coil. In this embodiment, theconcave portions 261 and theconvex portions 262 of the firstheat dissipating portion 26 are both provided occupying an entire circle along the circumferential direction of the outer surface of thefirst housing 2, while in practice, theconcave portions 261 and theconvex portions 262 of the firstheat dissipating portion 26 may also be provided occupying less than one circle along the circumferential direction of theouter surface 21 of thefirst housing 2. - Referring to
FIG. 8 , thefirst housing 2 is longitudinally cut along the axial direction to obtain a longitudinal section. In this embodiment, the firstheat dissipating portion 26 has a wave-like shape. In practice, the firstheat dissipating portion 26 may also has a wave-like shape composed of other geometries such as rectangles, triangles, or trapezoids. - The structure of the first housing according to the other three embodiments will be described below. For convenience of describing the first housing according to the other three embodiments, the first housing of a second embodiment is labeled as first housing 2 a, and the other legends are suffixed by a; the first housing of a third embodiment is labeled as first housing 2 b, and the other legends are suffixed by b; and the first housing of a fourth embodiment is labeled as
first housing 2 c, and the other legends are suffixed by c. - Referring to
FIG. 10 ,FIG. 10 is a schematic view showing the structure of the first housing according to the second embodiment, and the structure of the first housing according to the second embodiment will be described below. - Referring to
FIGS. 7 and 10 , the first housing 2 a includes a firstheat dissipating portion 26 a. An area of a projection of the firstheat dissipating portion 26 a onto anouter surface 212 a of acorresponding side wall 21 a is referred to as a first area, a surface area of the firstheat dissipating portion 26 a is referred to as a second area, and the second area is larger than or equal to the first area. Given a defined surface K′, the defined surface K′ is an outer surface not provided with the firstheat dissipating portion 26 a, the first area is a surface area of the defined surface K′, and theouter surface 212′ inFIG. 7 is fitted toFIG. 10 to obtain the defined surface K′ (the dotted line inFIG. 10 ). The firstheat dissipating portion 26 a includes multipleconvex portions 262 a, and the multipleconvex portions 262 a are arranged protruding away from the defined surface K′. Compared with the first embodiment, the firstheat dissipating portion 26 a is directly provided on the bare outer surface in this embodiment instead of by means of peeling, thereby increasing a heat dissipating area of thefirst housing 2, which facilitates the heat dissipation of the stator assembly and the electric control board. Reference can be made to the first housing according to the first embodiments for other features in this embodiment, which will not be described herein. - Referring to
FIG. 11 ,FIG. 11 is a schematic view showing the structure of the first housing according to the third embodiment, and the structure of the first housing according to the third embodiment will be described below. - Referring to
FIG. 11 , the first housing 2 b includes a firstheat dissipating portion 26 b. In this embodiment, the firstheat dissipating portion 26 b includes multiple convex portions 262 b, and the convex portions 262 b are arranged protruding away from anouter surface 212 b. The multiple convex portions 262 b are continuously arranged along an axial direction of the first housing 2 b, where the term “continuously arranged” means that each two adjacentconvex portions 212 b are connected end to end. In this embodiment, the convex portions 262 b have the same convex height, and a corresponding wall thickness of thefirst housing 2 at a corresponding convex portion 262 b is larger than or equal to 1.5 times the convex height of the corresponding convex portion 262 b. Compared with the first housing according to the other embodiments, thefirst heat dissipation 26 b in this embodiment only includes the convex portions 262 b, and does not include any concave portions, which also facilitates relatively increasing an area of the outer surface and thereby the heat dissipation area of the firstheat dissipating portion 26 b, thereby facilitating the heat dissipation of the stator assembly and the electric control board. Reference can be made to the first housing according to the first embodiment for other features in this embodiment, which will not be described herein. - Referring to
FIG. 12 ,FIG. 12 is a schematic view showing the structure of the first housing according to the fourth embodiment, and the structure of the first housing according to the fourth embodiment will be described below. - Referring to
FIG. 12 , thefirst housing 2 c includes a firstheat dissipating portion 26 c. In this embodiment, the firstheat dissipating portion 26 c includes multipleconcave portions 261 c. Theconcave portions 261 c are concaved from anouter surface 212 c toward a central axis of thefirst housing 2 c. Theconcave portions 261 c are continuously arranged in an axial direction of thefirst housing 2 c, where the term “continuously arranged” means that the each two adjacentconcave portions 261 c are connected end to end. A corresponding wall thickness of thefirst housing 2 c at a correspondingconcave portion 261 c of the firstheat dissipating portion 26 c is larger than or equal to 0.5 times a concave depth of the correspondingconcave portion 261 c. Compared with the first housing according to the other embodiments, in this embodiment, the firstheat dissipating portion 26 c includes only theconcave portions 261 c, and does not include any convex portions, which also facilitates relatively increasing an area of the outer surface and thereby the heat dissipation area of the first heat dissipating portion, thereby facilitating the heat dissipation of the stator assembly and the electric control board. Reference can be made to the first housing according to the first embodiment for other features in this embodiment, which will not be described herein. - Referring to
FIGS. 1 to 3 , the electric oil pump further includes asecond housing 7, and thesecond housing 7 is fixedly connected to thefirst housing 2. Referring toFIGS. 13 to 15 ,FIGS. 13 to 15 are schematic views showing the structure of the second housing. The second housing includes multipleconvex ribs 74, and theconvex ribs 74 and thesecond housing 7 are fixedly connected to each other or formed as one piece. In this embodiment, theconvex ribs 74 are integrally formed with thesecond housing 7 by injection molding. In conjunction withFIG. 3 , theconvex ribs 74 are arranged protruding away from thefirst housing 2, and thesecond housing 7 includes aplug 76. In conjunction withFIG. 3 , theplug 76 is arranged protruding away from thefirst housing 2. A region of thesecond housing 7 covered by the convex ribs is referred to as a first region, and an area of the first region is a third area. Referring toFIG. 16 , theelectric control board 6 includes asubstrate 61 and a heat-generatingelectric element 62, and the heat-generatingelectric element 62 is arranged on thesubstrate 61. A region of thesubstrate 61 covered by the heat-generatingelectric element 62 is referred to as a second region, and an area of the second region is a fourth area. The first region and the second regions are correspondingly arranged. With the first region and the second region vertically projected onto theelectric control board 6, at least a part of a vertical projection of the first region is overlapped with at least a part of a vertical projection of the second region and the third area is larger than or equal to the fourth area, by which it is sufficiently ensured that the heat generated by the heat-generatingelectric element 62 provided on thesubstrate 61 can be timely dissipated through the convex ribs in a short time, thereby reducing the influence of heat generated by the heat-generating electric element on the performance of the electric control board. - Referring to
FIG. 14 , thesecond housing 7 further includes afirst side wall 75. In this embodiment, theconvex ribs 74 are arranged substantially parallel to thefirst side wall 75, where the term “substantially parallel” means a depth of parallelism of theconvex ribs 74 is within 0.5 mm with thefirst side wall 75 serving as a reference surface, such that it can be ensured that as manyconvex ribs 74 as possible can be provided on the second housing, thereby increasing the heat dissipation area and facilitating the heat dissipation of the circuit board. In practice, theconvex ribs 74 can also be arranged at an angle with thefirst side wall 75. In this embodiment, a shape of a transverse section of theconvex rib 74 is a rectangle, while in practice, the transverse section of the convex rib may also have other shapes, such as a trapezoid, a triangle, and an arc. - Referring to
FIG. 17 ,FIG. 17 is a schematic view showing the structure of an electric oil pump according to another embodiment. Theelectric oil pump 100′ includes a pump housing, and the pump housing includes a pump cover 1, afirst housing 2 and asecond housing 7, where the pump cover 1, thefirst housing 2 and thesecond housing 7 are relatively fixedly connected. The pump housing defines a pump cavity, and the pump cavity includes afirst cavity 80 and asecond cavity 90, thefirst cavity 80 has a working medium flowing through, and apump rotor assembly 8 and anelectric control board 6 are provided in thefirst cavity 80; and thesecond cavity 90 has a working medium passing through, astator assembly 4, amotor rotor assembly 3 and anelectric control board 6 are provided in thesecond cavity 90. Theelectric oil pump 100′ further includes apump shaft 5′, thepump shaft 5′ includes ashaft hole 50 which connects the working media of thefirst cavity 80 and thesecond cavity 90 to each other, such that the working medium in the first cavity can flow into the second cavity through theshaft hole 50. Compared with the electric oil pump according to the first embodiment, the second cavity of the electric oil pump according to this embodiment has a working medium passing through, so that the working medium in the second cavity can also take away a part of heat generated by thestator assembly 4 during operation, which better facilitates heat dissipation of the stator assembly. Reference can be made to the electric oil pump according to the first embodiment for other features in this embodiment, which will not be described herein. - It be should be noted that the above embodiments are only used to explain the present disclosure and are not intended to limit the technical solutions described in the present disclosure. Although the present disclosure has been described in detail in conjunction with the above embodiments, those skilled in the art shall appreciate that modifications or equivalent replacements can still be made to the present disclosure by those skilled in the art, and that all the technical solutions and improvements thereof without departing from the spirit and scope of the present disclosure shall fall within the scope defined by the claims of the present disclosure.
Claims (22)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710770143.4 | 2017-08-31 | ||
CN201710770143.4A CN109424540A (en) | 2017-08-31 | 2017-08-31 | Electronic oil pump |
PCT/CN2018/090337 WO2019041953A1 (en) | 2017-08-31 | 2018-06-08 | Electric oil pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20200347838A1 true US20200347838A1 (en) | 2020-11-05 |
Family
ID=65504631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/642,850 Abandoned US20200347838A1 (en) | 2017-08-31 | 2018-06-08 | Electric oil pump |
Country Status (5)
Country | Link |
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US (1) | US20200347838A1 (en) |
EP (1) | EP3677778A4 (en) |
JP (1) | JP7414711B2 (en) |
CN (1) | CN109424540A (en) |
WO (1) | WO2019041953A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114659301A (en) * | 2020-12-23 | 2022-06-24 | 法雷奥汽车空调湖北有限公司 | Electronic expansion valve |
CN115143098B (en) * | 2021-03-30 | 2024-04-19 | 浙江三花汽车零部件有限公司 | Electronic oil pump |
CN114198630B (en) * | 2021-11-12 | 2023-07-21 | 绵阳富临精工股份有限公司 | Electronic oil pump |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002276571A (en) * | 2001-03-16 | 2002-09-25 | Tokico Ltd | Scroll type fluid machine |
JP2005337095A (en) * | 2004-05-26 | 2005-12-08 | Aisin Seiki Co Ltd | Electric pump |
CN2821225Y (en) * | 2005-08-17 | 2006-09-27 | 吴永祥 | Rotor pump |
JP2008193858A (en) * | 2007-02-07 | 2008-08-21 | Mitsuba Corp | Canned motor |
JP5418053B2 (en) * | 2009-08-05 | 2014-02-19 | 株式会社ジェイテクト | Electric pump unit for transmission |
JP5372649B2 (en) * | 2009-08-05 | 2013-12-18 | 日立オートモティブシステムズ株式会社 | Electric pump |
JP6108590B2 (en) * | 2012-01-17 | 2017-04-05 | アスモ株式会社 | Electric pump |
JP6084858B2 (en) * | 2013-02-25 | 2017-02-22 | アスモ株式会社 | Electric pump and electric pump assembly method |
CN203348071U (en) * | 2013-07-03 | 2013-12-18 | 自贡市川力实业有限公司 | Engine cooling water cycloid pump |
JP2015224600A (en) * | 2014-05-28 | 2015-12-14 | 株式会社豊田自動織機 | Electric supercharger |
CZ201597A3 (en) * | 2015-02-13 | 2016-02-24 | Jihostroj A.S. | Gear-type pump with a drive |
JP6682769B2 (en) * | 2015-05-29 | 2020-04-15 | 日本電産トーソク株式会社 | Pump device |
CN204696894U (en) * | 2015-06-26 | 2015-10-07 | 奉化市兴宇特种电机制造有限公司 | A kind of electric whistle peculiar to vessel drives DC brushless motor |
JP2017013592A (en) * | 2015-06-30 | 2017-01-19 | Ntn株式会社 | In-wheel motor drive device |
JP6502811B2 (en) * | 2015-09-18 | 2019-04-17 | アイシン精機株式会社 | Electric pump |
CN106640673B (en) * | 2015-10-30 | 2019-12-13 | 浙江三花汽车零部件有限公司 | Electrically driven pump |
CN205714508U (en) * | 2016-06-03 | 2016-11-23 | 温州市康松汽车零部件有限公司 | A kind of rotor mechanism of electric fuel punp |
CN207420851U (en) * | 2017-08-31 | 2018-05-29 | 杭州三花研究院有限公司 | Oil pump |
CN207363873U (en) * | 2017-08-31 | 2018-05-15 | 杭州三花研究院有限公司 | Electronic oil pump |
CN207363874U (en) * | 2017-08-31 | 2018-05-15 | 杭州三花研究院有限公司 | Electronic oil pump |
-
2017
- 2017-08-31 CN CN201710770143.4A patent/CN109424540A/en active Pending
-
2018
- 2018-06-08 US US16/642,850 patent/US20200347838A1/en not_active Abandoned
- 2018-06-08 JP JP2020512029A patent/JP7414711B2/en active Active
- 2018-06-08 EP EP18849856.2A patent/EP3677778A4/en active Pending
- 2018-06-08 WO PCT/CN2018/090337 patent/WO2019041953A1/en unknown
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CN109424540A (en) | 2019-03-05 |
WO2019041953A1 (en) | 2019-03-07 |
JP2021501281A (en) | 2021-01-14 |
EP3677778A1 (en) | 2020-07-08 |
EP3677778A4 (en) | 2020-12-23 |
JP7414711B2 (en) | 2024-01-16 |
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