Electric control oil pump

By designing the connected oil return tank and oil return hole structure in the electronic controlled oil pump, the problem of difficult oil residue in the motor cavity is difficult to discharge, stable circulation of oil products and drip reduction, and improved production efficiency and product quality.

CN223203242UActive Publication Date: 2025-08-08CHONGQING HONGYU PRECISION IND CO LTD
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Patent Information

Application Number
CN202422383415.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2025-08-08
Estimated Expiration
2034-09-29

AI Technical Summary

Technical Problem

After the assembly of the existing electronic oil control pumps, it is difficult to completely discharge the oil products inside the motor cavity, resulting in increased production costs and oil leakage during assembly, affecting product quality and on-site environment.

Method used

An electronically controlled oil pump structure is designed, in which the oil return groove of the oil pump cover and the motor case is connected to the oil return hole. The transmission oil enters the inside of the motor through the gap between the motor shaft and the central hole of the motor case, and returns to the oil inlet cavity through the oil return hole and the oil return groove, forming a stable circulation to ensure maximum discharge of residual oil.

Benefits of technology

It effectively reduces oil dripping during the manufacturing process, reduces production costs, and improves product quality and safety of the on-site environment.

✦ Generated by Eureka AI based on patent content.

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Abstract

An electric control oil pump comprises a driving motor, an outer rotor, an inner rotor, an oil pump cover, a motor shell and a motor shaft. When the electric control oil pump works, transmission oil enters the driving motor through the gap between the motor shaft and the center hole of the motor shell and then returns to the oil inlet cavity of the electric control oil pump through the oil return hole of the motor shell and the oil return groove in the end face of the oil pump cover. And a stable cycle is formed. According to the electric control oil pump for motor oil feeding, the oil return hole is formed in the lowest point of the whole motor cavity, residual oil in the driving motor cavity can be discharged to the maximum extent, and oil leakage in the manufacturing process is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of electronically controlled oil pumps, in particular to an electronically controlled oil pump. Background Art

[0002] The electronically controlled oil pump industry is an emerging sector closely tied to the electrification and intelligentization of vehicles, offering broad development prospects. Electronic oil pumps, an essential core component in new energy and hybrid vehicles, are primarily used for thermal management and cooling and lubrication systems in electric drive systems.

[0003] The electronically controlled oil pump that supplies oil to the motor has become a common oil pump design due to its excellent NVH and heat dissipation performance. Currently, the oil inlet and outlet routes of the motor cavity are generally designed to enter through the bearing hole and then return to the oil tank in the oil inlet cavity or the center hole of the motor rotor shaft. Due to structural limitations of the components, after the electronically controlled oil pump is assembled and tested off-line, it is difficult to completely drain the oil from the motor cavity. This increases oil consumption during production and affects product costs. Excessive residual oil inside the component can cause internal oil dripping during assembly, affecting the on-site environment and causing quality issues such as false oil leaks. Utility Model Content

[0004] The utility model aims to provide an electronically controlled oil pump, comprising a driving motor, an outer rotor, an inner rotor, an oil pump cover, a motor housing and a motor shaft.

[0005] An oil inlet cavity, an oil outlet cavity and a center groove are provided on an end surface of the oil pump cover close to the motor housing.

[0006] The central groove is located at the center of the end surface of the oil pump cover, and the oil inlet cavity and the oil outlet cavity surround the two sides of the central groove.

[0007] An oil inlet groove is provided on an end surface of the oil pump cover away from the motor housing.

[0008] The oil inlet cavity is communicated with the oil inlet groove.

[0009] An oil return groove is provided on one side of the oil inlet cavity.

[0010] A motor cavity is provided on the top of the motor housing, and the motor cavity is adapted to the drive motor.

[0011] An oil return hole is provided at the lowest axial point of the motor cavity.

[0012] A central hole is provided at the center of the motor cavity.

[0013] An oil pump rotor cavity is provided at the bottom of the motor housing, and the oil pump rotor cavity is adapted to the outer rotor.

[0014] The motor cavity and the oil pump rotor cavity are communicated through a central hole.

[0015] The drive motor is housed within the motor housing's motor cavity. An outer rotor and inner rotor are located within the oil pump rotor cavity. The motor shaft drives the inner rotor. The motor shaft passes through the motor housing's center hole and then into the center slot of the oil pump cover. The oil return slot of the oil pump cover is connected to the oil return hole of the motor housing.

[0016] Furthermore, the oil outlet cavity is connected to the central groove.

[0017] Furthermore, the outer rotor is clearance-matched with the oil pump rotor cavity of the motor housing.

[0018] Furthermore, the inner rotor is interference fit with the motor shaft.

[0019] Furthermore, the oil pump cover is interference-connected with the motor housing.

[0020] Furthermore, there is a certain gap between the oil pump cover and the outer rotor and the inner rotor in the axial direction.

[0021] The technical effect of the present invention is unquestionable. When the electronically controlled oil pump provided by the present invention is working, the transmission oil enters the interior of the drive motor through the gap between the motor shaft and the center hole of the motor housing, and then returns to the oil inlet chamber of the electronically controlled oil pump from the oil return hole of the motor housing and the oil return groove on the end face of the oil pump cover, forming a stable cycle.

[0022] The utility model discloses an electric-controlled oil pump for oil supply to a motor. The oil return hole is opened at the lowest point of the entire motor cavity, which can discharge the residual oil in the driving motor cavity to the maximum extent and reduce oil dripping during the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of an electronically controlled oil pump of the present utility model;

[0024] Figure 2 Schematic diagram of the motor housing;

[0025] Figure 3 is a schematic diagram of the outer rotor;

[0026] Figure 4 is a schematic diagram of the inner rotor;

[0027] Figure 5 This is a cross-sectional view of the oil pump cover;

[0028] Figure 6 This is the front view of the oil pump cover;

[0029] In the figure, the drive motor 1, the outer rotor 2, the inner rotor 3, the shaft hole 301, the oil pump cover 4, the oil inlet chamber 401, the oil outlet chamber 402, the oil return groove 403, the center groove 404, the oil inlet groove 405, the motor housing 11, the oil return hole 111, the oil pump rotor cavity 112, the motor cavity 113, the center hole 114, and the motor shaft 12. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the following embodiments. However, it should not be understood that the scope of the present invention is limited to the following embodiments. Without departing from the above technical concept of the present invention, various substitutions and modifications based on common technical knowledge and customary means in the field should be included in the scope of protection of the present invention.

[0031] Example 1:

[0032] See also Figures 1 to 6 , an electronically controlled oil pump, comprising: a driving motor 1, an outer rotor 2, an inner rotor 3, an oil pump cover 4, a motor housing 11, and a motor shaft 12.

[0033] An oil inlet cavity 401 , an oil outlet cavity 402 , and a center groove 404 are formed on an end surface of the oil pump cover 4 close to the motor housing 11 .

[0034] The central groove 404 is located at the center of the end surface of the oil pump cover 4 , and the oil inlet cavity 401 and the oil outlet cavity 402 surround the central groove 404 on both sides.

[0035] An oil inlet groove 405 is provided on an end surface of the oil pump cover 4 away from the motor housing 11 .

[0036] The oil inlet cavity 401 is connected to the oil inlet groove 405 .

[0037] An oil return groove 403 is provided on one side of the oil inlet cavity 401 .

[0038] A motor cavity 113 is provided on the top of the motor housing 11 , and the motor cavity 113 is adapted to the driving motor 1 .

[0039] An oil return hole 111 is provided at the lowest axial point of the motor cavity 113 .

[0040] A central hole 114 is defined at the center of the motor cavity 113 .

[0041] An oil pump rotor cavity 112 is provided at the bottom of the motor housing 11 , and the oil pump rotor cavity 112 is adapted to the outer rotor 2 .

[0042] The motor cavity 113 and the oil pump rotor cavity 112 are connected through a central hole 114 .

[0043] The drive motor 1 is placed in the motor cavity 113 of the motor housing 11. The outer rotor 2 and inner rotor 3 are arranged in the oil pump rotor cavity 112. The motor shaft 12 drives the inner rotor 3 to rotate. The motor shaft 12 passes through the center hole 114 of the motor housing 11 and is inserted into the center groove 404 of the oil pump cover 4. The oil return groove 403 of the oil pump cover 4 is connected to the oil return hole 111 of the motor housing 11.

[0044] Example 2:

[0045] An electronically controlled oil pump, the main technical contents of which are shown in Example 1. Furthermore, the oil outlet cavity 402 is connected to the central groove 404.

[0046] Example 3:

[0047] An electronically controlled oil pump, the main technical content of which is shown in any one of Examples 1 to 2, further comprising a clearance fit between the outer rotor 2 and the oil pump rotor cavity 112 of the motor housing 11.

[0048] Example 4:

[0049] An electronically controlled oil pump, the main technical content of which is shown in any one of Examples 1 to 3, further, the inner rotor 3 and the motor shaft 12 are interference fit.

[0050] Example 5:

[0051] An electronically controlled oil pump, the main technical content of which is shown in any one of Embodiments 1 to 4, further, the oil pump cover 4 is interference-connected with the motor housing 11.

[0052] Example 6:

[0053] An electronically controlled oil pump, the main technical content of which is shown in any one of Examples 1 to 5. Furthermore, there is a certain axial gap between the oil pump cover 4 and the outer rotor 2 and the inner rotor 3.

[0054] Example 7:

[0055] See also Figures 1 to 6 , an electronically controlled oil pump, comprising: a driving motor 1, an outer rotor 2, an inner rotor 3, an oil pump cover 4, a motor housing 11, and a motor shaft 12.

[0056] The outer rotor 2 is a cylindrical structure, and its interior is meshed with the inner rotor 3 .

[0057] The inner rotor 3 has a shaft hole 301 at its center, and the shaft hole 301 is matched with the motor shaft 12 .

[0058] The oil pump cover 4 is a rotating body structure as a whole.

[0059] An oil inlet cavity 401 , an oil outlet cavity 402 , and a center groove 404 are formed on an end surface of the oil pump cover 4 close to the motor housing 11 .

[0060] The central groove 404 is located at the center of the end surface of the oil pump cover 4 , and the oil inlet cavity 401 and the oil outlet cavity 402 surround the central groove 404 on both sides.

[0061] An oil inlet groove 405 is provided on an end surface of the oil pump cover 4 away from the motor housing 11 .

[0062] The oil inlet cavity 401 is connected to the oil inlet groove 405 .

[0063] An oil return groove 403 is provided on one side of the oil inlet cavity 401 .

[0064] The width of the oil return groove is 3mm to 6mm, and the depth of the oil return groove is 0.5mm to 3mm.

[0065] A motor cavity 113 is provided on the top of the motor housing 11 , and the motor cavity 113 is adapted to the driving motor 1 .

[0066] An oil return hole 111 is provided at the lowest axial point of the motor cavity 113 .

[0067] The diameter of the oil return hole is φ1mm~φ4mm, the radial position of the oil return hole is close to the outer diameter position of the oil pump cover, the oil return hole is at the axial lowest point of the motor cavity of the motor housing, and the oil return hole is connected to the oil inlet cavity of the electronically controlled oil pump through the groove on the end face of the oil pump cover.

[0068] A central hole 114 is defined at the center of the motor cavity 113 .

[0069] An oil pump rotor cavity 112 is provided at the bottom of the motor housing 11 , and the oil pump rotor cavity 112 is adapted to the outer rotor 2 .

[0070] The motor cavity 113 and the oil pump rotor cavity 112 are connected through a central hole 114 .

[0071] The drive motor 1 is placed in the motor cavity 113 of the motor housing 11. The outer rotor 2 is meshed with the inner rotor 3 and placed in the oil pump rotor cavity 112 of the motor housing 11. The motor shaft 12 passes through the center hole 114 of the motor housing 11 and the shaft hole 301 of the inner rotor 3 in sequence, and is then inserted into the center groove 404 of the oil pump cover 4. The oil return groove 403 of the oil pump cover 4 is connected to the oil return hole 111 of the motor housing 11.

[0072] When the electronically controlled oil pump is working, the transmission oil enters the interior of the drive motor through the gap between the motor shaft and the center hole of the motor housing, and then returns to the oil inlet chamber of the electronically controlled oil pump from the oil return hole of the motor housing and the oil return groove on the end face of the oil pump cover, forming a stable cycle.

[0073] Example 8:

[0074] An electronically controlled oil pump, the main technical contents of which are shown in Example 7. Furthermore, the oil outlet cavity 402 is connected to the central groove 404.

[0075] Example 9:

[0076] An electronically controlled oil pump, the main technical content of which is shown in any one of Embodiments 7 to 8. Furthermore, the outer rotor 2 is clearance-matched with the oil pump rotor cavity 112 of the motor housing 11.

[0077] Example 10:

[0078] An electronically controlled oil pump, the main technical content of which is shown in any one of Examples 7 to 9, further, the shaft hole 301 is interference fit with the motor shaft 12.

[0079] Example 11:

[0080] An electronically controlled oil pump, the main technical content of which is shown in any one of Embodiments 7 to 10, further, the oil pump cover 4 is interference-connected with the motor housing 11.

[0081] Example 12:

[0082] An electronically controlled oil pump, the main technical content of which is shown in any one of Examples 7 to 11. Furthermore, there is a certain axial gap between the oil pump cover 4 and the outer rotor 2 and the inner rotor 3.

[0083] Example 13:

[0084] See also Figures 1 to 6 , an electronically controlled oil pump, comprising: a drive motor, a motor housing, a motor shaft, an inner rotor, an outer rotor, and an oil pump cover. The motor housing on the drive motor is provided with an oil pump rotor cavity, the outer rotor is installed in the oil pump rotor cavity by a clearance fit, the inner rotor is connected to the motor shaft by an interference fit, and is in meshing contact with the outer rotor. The motor shaft passes through the center hole on the motor housing and can rotate in the center hole of the motor housing. The oil pump cover is interference-connected to the motor housing, and fits with the axial end faces of the inner rotor and the outer rotor. At the same time, there is a certain axial gap between the oil pump cover and the inner rotor and the outer rotor;

[0085] The motor housing is composed of an upper and lower circular rotating body structure. The upper end of the motor housing is a motor cavity, and the interior is a cavity structure for installing the parts of the drive motor. The oil pump rotor cavity at the lower end of the motor housing is used to install the outer rotor and the inner rotor, and is interference-connected with the oil pump cover. There is a partition of a certain thickness between the upper and lower cavities of the motor housing, and there is an oil return hole on the partition. The diameter of the oil return hole is φ1mm~φ4mm. The radial position of the oil return hole is close to the outer diameter position of the oil pump cover. The oil return hole is at the axial lowest point of the motor cavity of the motor housing. The oil return hole is connected to the oil inlet cavity of the electronically controlled oil pump through the slot on the end face of the oil pump cover.

[0086] The oil pump cover is a circular, rotating structure. An oil inlet and an oil outlet cavity are defined on the end surface of the oil pump cover near the motor housing. An oil return groove is defined on the end surface of the oil pump cover near the oil inlet cavity. The groove is aligned with the center of the oil return hole on the motor housing. The groove is 3mm to 6mm wide and 0.5mm to 3mm deep.

[0087] When the electronically controlled oil pump is working, the transmission oil enters the interior of the drive motor through the gap between the motor shaft and the center hole of the motor housing, and then returns to the oil inlet chamber of the electronically controlled oil pump from the oil return hole of the motor housing and the oil return groove on the end face of the oil pump cover, forming a stable cycle.

Claims

1. An electronically controlled oil pump, characterized in that: include: Drive motor (1), outer rotor (2), inner rotor (3), oil pump cover (4), motor housing (11), motor shaft (12); An oil inlet cavity (401), an oil outlet cavity (402), and a center groove (404) are provided on an end surface of the oil pump cover (4) close to the motor housing (11); The central groove (404) is located at the center of the end surface of the oil pump cover (4), and the oil inlet cavity (401) and the oil outlet cavity (402) surround the central groove (404) on both sides; An oil inlet groove (405) is provided on the end surface of the oil pump cover (4) away from the motor housing (11); The oil inlet cavity (401) is connected to the oil inlet groove (405); An oil return groove (403) is provided on one side of the oil inlet cavity (401); A motor cavity (113) is provided on the top of the motor housing (11), and the motor cavity (113) is adapted to the drive motor (1); An oil return hole (111) is provided at the lowest axial point of the motor cavity (113); A central hole (114) is provided at the center of the motor cavity (113); An oil pump rotor cavity (112) is provided at the bottom of the motor housing (11), and the oil pump rotor cavity (112) is adapted to the outer rotor (2); The motor cavity (113) and the oil pump rotor cavity (112) are connected through a center hole (114); The driving motor (1) is placed in a motor cavity (113) of a motor housing (11); an outer rotor (2) and an inner rotor (3) are arranged in an oil pump rotor cavity (112); the motor shaft (12) drives the inner rotor (3) to rotate; the motor shaft (12) passes through a central hole (114) of the motor housing (11) and is inserted into a central groove (404) of an oil pump cover (4); and the oil return groove (403) of the oil pump cover (4) is connected to the oil return hole (111) of the motor housing (11).

2. An electronically controlled oil pump according to claim 1, characterized in that: The oil outlet cavity (402) is communicated with the central groove (404).

3. The electronically controlled oil pump according to claim 1, characterized in that: The outer rotor (2) is clearance-matched with the oil pump rotor cavity (112) of the motor housing (11).

4. The electronically controlled oil pump according to claim 1, characterized in that: The inner rotor (3) and the motor shaft (12) are interference fit.

5. The electronically controlled oil pump according to claim 1, characterized in that: The oil pump cover (4) is interference-connected with the motor housing (11).

6. The electronically controlled oil pump according to claim 1, characterized in that: There is a certain gap between the oil pump cover (4) and the outer rotor (2) and the inner rotor (3) in the axial direction.