CN111934485B

CN111934485B - Electronic oil pump

Info

Publication number: CN111934485B
Application number: CN202010683222.3A
Authority: CN
Inventors: 罗思维; 王怀东; 周裕斌
Original assignee: Zhejiang Ruichi Tongli Automotive Electronics Co Ltd
Current assignee: Zhejiang Ruichi Tongli Automotive Electronics Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2023-03-03
Anticipated expiration: 2040-07-15
Also published as: CN111934485A

Abstract

The invention discloses an electronic oil pump, comprising: a stator assembly, a rotor assembly and a pump assembly; the stator assembly includes: the stator comprises an end cover, a stator shell and a stator assembly positioned in the stator shell; the rotor assembly includes: a rotor housing and a rotor assembly located within the rotor housing; the pump assembly includes: a pump cover and a pump assembly located within the pump cover; the rotor assembly includes: the pivot, angular contact bearing, ball bearing and rotor, the pot head of pivot is equipped with angular contact bearing, stator module is provided with the bearing frame towards the one end of rotor subassembly, angular contact bearing sets up in the bearing frame, the other end of pivot passes the through-hole on the surface of the one end of rotor housing's orientation pump package spare, stretch into in the pump cover, the pot head of the other end of pivot is equipped with the pump package spare, the other end of pivot still is equipped with ball bearing, and the axle sleeve sets up in rotor housing's through-hole, the rotor cover is established in the pivot. By adopting the angular contact bearing, the unilateral axial force caused by the magnetic attraction between the stator and the rotor can be borne.

Description

Electronic oil pump

Technical Field

The invention relates to the technical field of electronic oil pumps, in particular to an electronic oil pump.

Background

The gearbox is a very important part in the automobile, and an oil pump in the gearbox plays roles in lubricating, cooling and shifting the gearbox and is an indispensable key part. Electronic oil pumps are receiving more and more attention due to their advantages of high efficiency, compact structure, flexible control, etc. However, the electronic oil pump in the prior art cannot bear the unilateral axial force caused by the magnetic attraction, so that the electronic oil pump is easy to damage.

Disclosure of Invention

The embodiment of the invention provides an electronic oil pump, which aims to solve the problem that the electronic oil pump in the prior art is easy to damage.

The embodiment of the invention discloses an electronic oil pump, which comprises: a stator assembly, a rotor assembly and a pump assembly; the stator assembly includes: the stator comprises an end cover, a stator shell and a stator assembly positioned in the stator shell; the rotor assembly includes: a rotor housing and a rotor assembly located within the rotor housing; the pump assembly includes: the pump cover and the pump assembly are positioned in the pump cover; the stator shell, the rotor shell and the pump cover are sequentially communicated, the end cover seals one end of the stator shell, which is back to the rotor assembly, and the surface of one end of the pump cover, which is back to the rotor assembly, is provided with a liquid inlet and a liquid outlet; the rotor assembly includes: the pump comprises a rotating shaft, an angular contact bearing, a ball bearing and a rotor, wherein one end of the rotating shaft faces towards the stator assembly, the other end of the rotating shaft faces towards the pump assembly, one end of the rotating shaft is provided with the angular contact bearing, the stator assembly faces towards one end of the rotor assembly, the angular contact bearing is arranged in the bearing seat, the other end of the rotating shaft penetrates through a through hole in the surface of one end of the pump assembly and extends into the pump cover, the other end of the rotating shaft is provided with the pump assembly, the other end of the rotating shaft is further provided with the ball bearing in a sleeved mode, the ball bearing is arranged in the through hole of the rotor housing, the rotor is sleeved on the rotating shaft and is located between the angular contact bearing and the ball bearing, and the stator assembly is used for driving the rotor to rotate.

Further, the rotor includes: a plurality of magnetic steels and a rotor core; a plurality of the magnet steel is located rotor core's orientation stator module's one end is on the surface, and centers on rotor core's center sets up at even interval.

Further, the stator assembly includes: a stator, the stator comprising: stator core base, a plurality of bobbins, a plurality of stator core and multiunit wire winding, the orientation of stator core base the surface of the one end of rotor subassembly centers on the center of stator core base evenly is provided with a plurality of spacing grooves, each be provided with each in the spacing groove bobbin and each stator core, each the bobbin case is established at each outside the stator core, every group the wire winding centers on each on the surface of bobbin.

Further: the bearing seat is positioned in a space surrounded by the stator cores.

Further, the stator assembly further includes: PCB support and PCB board, the PCB support is located the dorsad of stator core base the one end of rotor subassembly is on the surface, the PCB support the stator core base with stator casing injection moulding structure as an organic whole, the dorsad of PCB support the surface of the one end of stator core base is provided with a plurality of connecting pieces, the PCB board is with a plurality of the connecting piece is connected.

Further, the stator assembly further includes: the connecting piece is provided with a through groove for the fisheye needle to pass through, one end of the fisheye needle passes through the through groove to be electrically connected with the winding wire, and the other end of the fisheye needle is electrically connected with the PCB.

Further, the stator assembly further includes: one end of the interface extends out of the end cover, the other end of the interface is electrically connected with the PCB,

further, the pump assembly comprises: the pump cover comprises an inner gear and an outer gear, wherein the inner gear and the outer gear are both located in the pump cover, the outer gear is sleeved on the outer surface of the inner gear, the other end of the rotating shaft is inserted into an inner hole of the inner gear, the size of one end of the rotor assembly, which faces the inner hole, is matched with the rotating shaft, a plurality of convex teeth are uniformly arranged on the outer surface of the inner gear, a plurality of concave pits are uniformly arranged on the inner surface of the outer gear, and at least part of the convex teeth are meshed with the concave pits.

Further: the end cover is fixedly connected with the stator shell through bolts, the stator shell is fixedly connected with the rotor shell through bolts, and the pump cover is fixedly arranged on the surface of one end, facing the pump assembly, of the stator shell.

Further: and O-shaped rings are arranged on the contact surfaces of the stator shell and the end cover, and on the contact surfaces of the rotor shell and the stator shell.

The electronic oil pump provided by the embodiment of the invention adopts the angular contact bearing, can bear the unilateral axial force caused by the magnetic attraction between the stator and the rotor, has strong heat dissipation capacity, completely isolates the PCB from the oil, has relatively larger space, is very friendly to the arrangement of a hardware circuit, is convenient to assemble, disassemble and replace, is convenient to maintain, has a compact structure, and is very suitable for application occasions with insufficient height space.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a perspective view of an electronic oil pump of an embodiment of the present invention;

fig. 2 is a side view of an electronic oil pump of an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a perspective view of a rotor of the electronic oil pump of the embodiment of the present invention;

fig. 5 is a schematic structural view of a stator core base and a PCB of the electronic oil pump according to the embodiment of the present invention;

fig. 6 is a schematic structural view of a stator and a PCB of the electronic oil pump of the embodiment of the present invention;

fig. 7 is a schematic structural view of an internal gear and an external gear of the electronic oil pump according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention discloses an electronic oil pump. As shown in fig. 1~7, the electronic oil pump includes: stator assembly, rotor assembly and pump assembly. The stator assembly includes: end cap 1, stator casing 2 and the stator assembly that is located in stator casing 2. The rotor assembly includes: a rotor housing 3 and a rotor assembly located within the rotor housing 3. The pump assembly includes: a pump cover 4 and a pump assembly located within the pump cover 4. The stator shell 2, the rotor shell 3 and the pump cover 4 are communicated in sequence. The end cap 1 seals the end of the stator housing 2 facing away from the rotor assembly. The surface of one end of the pump cover 4, which faces away from the rotor assembly, is provided with a liquid inlet 401 and a liquid outlet 402, so that oil can flow in and out from the liquid inlet 401 and the liquid outlet 402.

Specifically, the rotor assembly includes: a rotating shaft 5, an angular contact bearing 6, a ball bearing 7 and a rotor. It will be appreciated that one end of the shaft 5 faces the stator assembly and the other end of the shaft 5 faces the pump assembly. One end of the rotating shaft 5 is sleeved with an angular contact bearing 6. By adopting the angular contact bearing 6, unilateral axial force caused by magnetic attraction between the stator and the rotor can be borne, and damage caused by large abrasion is avoided. The end of the stator assembly facing the rotor assembly is provided with a bearing block 8. The angular contact bearing 6 is arranged in a bearing seat 8. The other end of the rotating shaft 5 passes through a through hole on the surface of the rotor case 3 facing the end of the pump assembly, and extends into the pump cover 4. The other end of the rotating shaft 5 is sleeved with a pump assembly. The other end of the rotating shaft 5 is also sleeved with a ball bearing 7, and the ball bearing 7 is arranged in the through hole of the rotor housing 3. The rotor is sleeved on the rotating shaft 5 and is positioned between the angular contact bearing 6 and the ball bearing 7. The stator assembly is used for driving the rotor to rotate. The rotor includes: a plurality of magnetic steels 9 and a rotor core 10. The rotor core is disc-shaped. A plurality of magnetic steels 9 are located on the surface of rotor core 10 towards one end of the stator assembly and are evenly spaced around the centre of rotor core 10. Specifically, the surface of the end of the rotor core 10 facing the stator assembly may be provided with a plurality of magnetic steel slots, and one end of the magnetic steel 9 is installed in the magnetic steel slots. In a preferred embodiment of the present invention, the number of the magnetic steels 9 is four. The magnetic steel 9 is fan-shaped. The rotation shaft 5 passes through the center of the rotor core 10.

Specifically, the stator assembly includes: and a stator. The stator includes: a stator core base 11, a plurality of bobbins 12, a plurality of stator cores 13, and a plurality of sets of windings 14. The stator core base 11 and the stator shell 2 are integrally formed through injection molding, so that the heat dissipation capacity can be greatly improved; in addition, the rotor housing 3 is filled with oil, and a part of heat generated by the stator assembly can be taken away. The surface of the stator core base 11 facing one end of the rotor assembly is uniformly provided with a plurality of limiting grooves 111 around the center of the stator core base 11. Each of the bobbins 12 and each of the stator cores 13 are disposed in each of the restraining grooves 111. The stator core 13 has a fan-column shape. The bobbin 12 has a hollow structure, and the hollow shape thereof matches the shape of the stator core 13. Each bobbin 12 is fitted over each stator core 13. Each set of windings 14 surrounds the outer surface of each bobbin 12. In a preferred embodiment of the present invention, if the number of the stator cores 13 is six, the number of the bobbins 12 is also six, and the number of the windings 14 is six. The bearing housing 8 is located in a space surrounded by the plurality of stator cores 13. The groove space surrounded by the stator core 13 and the shaft hole on the rotor shell 3 can play the role of supporting and limiting radial runout. The surface of the bearing housing 8 facing the end of the rotor assembly is flush with the surface of the stator core 13 facing the end of the rotor assembly. The outer surface of the side wall of the bearing housing 8 may be fixedly connected with the stator core 13. Through the description of the structure, the electronic oil pump with the disc structure is very compact in structure and very suitable for application occasions with insufficient height space.

Furthermore, the stator assembly further comprises: a PCB support 15 and a PCB board 16. The PCB support 15 is located on the surface of the stator core base 11 at the end facing away from the rotor assembly. The PCB support 15, the stator core base 11 and the stator shell 2 are formed into an integral structure through injection molding, so that the PCB 16 can be completely isolated from oil, and the PCB 16 is protected from being corroded by the oil. The surface of the PCB support 15 facing away from the end of the stator core base 11 is provided with a plurality of connectors 17. The PCB board 16 is connected with a plurality of connectors 17. The connecting member 17 may be formed in an inverted "concave" shape as a whole. The disc type assembly design of the rotor assembly and the stator assembly in the embodiment of the invention ensures that the space for accommodating the PCB 16 is relatively large, is relatively friendly to the arrangement of hardware circuits, and is also beneficial to improving the heat dissipation capacity of the PCB 16.

Furthermore, the stator assembly further comprises: a plurality of eyelets 18. The connector 17 has a through slot through which the eye pin 18 passes. One end of the fish eye needle 18 passes through the through slot to be electrically connected with the winding 14. The other end of the fisheye pin 18 is electrically connected to the PCB board 16.

Furthermore, the stator assembly further comprises: a socket 19. One end of the socket 19 extends out of the end cap 1. The other end of the socket 19 is electrically connected to the PCB board 16. The socket 19 is used for electrical connection with an external device.

Specifically, the pump assembly includes: an internal gear 20 and an external gear 21. The internal gear 20 and the external gear 21 are both located inside the pump cover 4. The outer gear 21 is fitted over the outer surface of the inner gear 20. The other end of the rotation shaft 5 is inserted into the inner hole 201 of the inner gear 20. The size of the inner bore 201 towards the end of the rotor assembly matches the shaft 5. In a preferred embodiment of the present invention, the shape of the inner hole 201 facing one end of the rotor assembly is concave from two sides to the middle. A plurality of convex teeth are uniformly provided on the outer surface of the inner gear 20. A plurality of depressions are uniformly provided on the inner surface of the outer gear 21. At least some of the convex teeth are engaged with the concave recesses, so that the external gear 21 is rotated when the internal gear 20 is rotated.

Specifically, the end cover 1 and the stator housing 2 are fixedly connected through bolts. The stator housing 2 and the rotor housing 3 are also fixedly connected by bolts. A pump cover 4 is fixedly arranged on the surface of the stator housing 2 facing the end of the pump assembly. Through four independent structures that set up end cover 1, stator housing 2, rotor housing 3 and pump cover 4, can assemble, dismantle and replace very conveniently for electronic oil pump's maintenance is very convenient, can not appear because the defect of certain part leads to whole electronic oil pump condemned problem.

Preferably, an O-ring 22 is provided on the contact surface of the stator housing 2 and the end cover 1, and an O-ring 22 is also provided on the contact surface of the rotor housing 3 and the stator housing 2. By providing the O-ring 22, the connection surface between the housing and the casing is further sealed to prevent oil leakage.

During assembly, the assembly process of the stator assembly is as follows: the bobbin 12 is fitted around the stator core 13. The winding 14 is wound on the bobbin 12, and then the bobbin 12 and the stator core 13, which are completed by the winding, are inserted into the stopper groove 111 of the stator core base 11, forming a complete stator. The stator is placed in the stator housing 2. The bearing seat 8 is arranged in a space surrounded by the stator core 13. Then, the PCB support 15 is placed in the stator housing 2, and the stator, the bearing seat 8, the PCB support 15 and the stator housing 2 are molded into a whole under the support of an external tool. After injection molding is completed, the PCB 16 is connected with the winding 14, and the end cover 1 is covered and locked through screws, so that the assembly of the stator assembly is completed. The assembly process of the rotor assembly is as follows: and coating a layer of glue in the magnetic steel groove on the surface of the rotor core 10, and putting the magnetic steel 9 into the magnetic steel groove for drying. One end of the rotor core 10 is press-fitted into the angular contact bearing 6 with interference. The rotating shaft 5 penetrates through the rotor core 10, and the rotor core 10 and the rotating shaft 5 are pressed in an interference fit mode. And pressing the ball bearing 7 and the other end of the rotating shaft 5 in an interference manner. And (4) carrying out interference press mounting on the ball bearing 7 and the rotor shell 3 to finally complete the assembly of the rotor assembly. The assembly process of the pump assembly is as follows: the external gear is sleeved outside the internal gear and is arranged in the pump cover. And (5) inserting the other end of the rotating shaft 5 into the internal gear to complete the assembly of the pump assembly. The stator housing 2 and the rotor housing 3 are locked by screws. The rotor assembly is connected with the pump assembly through a flat key at the shaft end.

When in use, an external power supply is inserted into the plug-in interface 19 to supply power to the PCB 16. The PCB board 16 outputs a current varying according to a predetermined rule to the winding 14, and the current causes the stator core 13 to generate a varying excitation magnetic field. The excitation magnetic field causes the rotor to rotate, the rotating shaft 5 drives the inner gear 20 to rotate, and the inner gear 20 drives the outer gear 21 to rotate. Since the internal gear 20 and the external gear 21 are not completely meshed, the internal gear 20 and the external gear 21 cause a change in the cavity therebetween during rotation, so that oil can flow into the pump cover 4 from the oil inlet 401 and flow out of the pump cover 4 from the oil outlet 402.

In summary, the electronic oil pump of the embodiment of the invention adopts the angular contact bearing, can bear the unilateral axial force caused by the magnetic attraction between the stator and the rotor, has strong heat dissipation capability, completely isolates the PCB from the oil, has relatively larger space, is very friendly to the arrangement of a hardware circuit, is convenient for assembly, disassembly and replacement, has convenient maintenance and compact structure, and is very suitable for application occasions with insufficient height space.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An electronic oil pump, comprising: a stator assembly, a rotor assembly and a pump assembly; the stator assembly includes: the stator assembly comprises an end cover, a stator shell and a stator assembly positioned in the stator shell; the rotor assembly includes: a rotor housing and a rotor assembly located within the rotor housing; the pump assembly includes: the pump cover and the pump assembly are positioned in the pump cover; the stator shell, the rotor shell and the pump cover are sequentially communicated, the end cover seals one end of the stator shell, which is back to the rotor assembly, and the surface of one end of the pump cover, which is back to the rotor assembly, is provided with a liquid inlet and a liquid outlet;

the rotor assembly includes: the pump comprises a rotating shaft, an angular contact bearing, a ball bearing and a rotor, wherein one end of the rotating shaft faces towards the stator assembly, the other end of the rotating shaft faces towards the pump assembly, one end of the rotating shaft is provided with the angular contact bearing, the stator assembly faces towards one end of the rotor assembly, the angular contact bearing is arranged in the bearing seat, the other end of the rotating shaft penetrates through a through hole in the surface of one end of the pump assembly and extends into the pump cover, the other end of the rotating shaft is provided with the pump assembly, the other end of the rotating shaft is further provided with the ball bearing in a sleeved mode, the ball bearing is arranged in the through hole of the rotor housing, the rotor is sleeved on the rotating shaft and is located between the angular contact bearing and the ball bearing, and the stator assembly is used for driving the rotor to rotate.

2. The electronic oil pump of claim 1, wherein the rotor comprises: a plurality of magnetic steels and a rotor core; the magnetic steels are located on the surface of the rotor core, which faces towards one end of the stator assembly, and surround the centers of the rotor core at uniform intervals.

3. The electronic oil pump of claim 1, wherein the stator assembly comprises: a stator, the stator comprising: stator core base, a plurality of bobbins, a plurality of stator core and multiunit wire winding, the orientation of stator core base the surface of the one end of rotor subassembly centers on the center of stator core base evenly is provided with a plurality of spacing grooves, each be provided with each in the spacing groove bobbin and each stator core, each the bobbin case is established at each outside the stator core, every group the wire winding centers on each on the surface of bobbin.

4. The electronic oil pump of claim 3, wherein: the bearing seat is positioned in a space surrounded by the stator cores.

5. The electronic oil pump of claim 3, wherein the stator assembly further comprises: PCB support and PCB board, the PCB support is located the dorsad of stator core base the one end of rotor subassembly is on the surface, the PCB support the stator core base with stator casing injection moulding structure as an organic whole, the dorsad of PCB support the surface of the one end of stator core base is provided with a plurality of connecting pieces, the PCB board is with a plurality of the connecting piece is connected.

6. The electronic oil pump of claim 5, wherein the stator assembly further comprises: the connecting piece is provided with a through groove for the fisheye needles to pass through, one end of each fisheye needle passes through the through groove to be electrically connected with the winding wire, and the other end of each fisheye needle is electrically connected with the PCB.

7. The electronic oil pump of claim 5, wherein the stator assembly further comprises: and one end of the plug-in interface extends out of the end cover, and the other end of the plug-in interface is electrically connected with the PCB.

8. The electronic oil pump of claim 1, wherein the pump assembly comprises: the pump cover comprises an inner gear and an outer gear, wherein the inner gear and the outer gear are both located in the pump cover, the outer gear is sleeved on the outer surface of the inner gear, the other end of the rotating shaft is inserted into an inner hole of the inner gear, the size of one end of the rotor assembly, which faces the inner hole, is matched with the rotating shaft, a plurality of convex teeth are uniformly arranged on the outer surface of the inner gear, a plurality of concave pits are uniformly arranged on the inner surface of the outer gear, and at least part of the convex teeth are meshed with the concave pits.

9. The electronic oil pump of claim 1, wherein: the end cover is fixedly connected with the stator shell through bolts, the stator shell is fixedly connected with the rotor shell through bolts, and the pump cover is fixedly arranged on the surface of one end, facing the pump assembly, of the stator shell.

10. The electronic oil pump of claim 9, wherein: and O-shaped rings are arranged on the contact surfaces of the stator shell and the end cover, and on the contact surfaces of the rotor shell and the stator shell.