Electronic control oil pump for vehicle

Abstract

The utility model discloses an electric control oil pump for a vehicle. The electric control oil pump comprises a motor rotor assembly, an inner rotor, a motor shell and an oil seal, one end of the motor shell is plugged through a pump cover, the end face of the motor shell is provided with a rotor cavity for containing the inner rotor and an oil pump cavity located at the bottom of the rotor cavity, the other end of the motor shell is plugged through a heat dissipation cover, the interior of the motor shell is a cavity used for containing a motor rotor assembly, and a driving shaft of the motor shell penetrates through a shaft hole formed in the center of the motor shell and extends into an inner hole of the inner rotor. And the motor cavity and the oil pump cavity are divided through an oil seal arranged outside the driving shaft. The oil pump cavity comprises a pressure relief hole, a lubricating groove, an oil groove I, an oil groove II, a high-pressure cavity and a low-pressure cavity, oil flows into the gap between the driving shaft and the shaft hole from the high-pressure cavity through the oil groove I, reaches the lubricating groove and the oil groove II, and flows into the low-pressure cavity from the pressure relief hole under the action of high pressure, so that the shaft is lubricated. According to the device, the cost is effectively reduced, the assembly process is simplified, and meanwhile, the assembly failure mode is reduced.

Description

Technical Field

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

[0002] Electronic oil pumps are essential components in the cooling and lubrication systems of new energy vehicles' main drive systems. With growing market demand for electronic oil pumps, an increasing number of automotive parts suppliers and system integrators are participating in their development and supply. This has led to intense competition within the supply chain, driving continuous technological advancement and cost reductions. To reduce system complexity and costs, the technological development trend for electronic oil pumps is towards closer integration with other vehicle systems. By optimizing the overall design of the electronically controlled pump, including the lubrication pair, rotor positioning, and motor stator, the pump is becoming more compact, improving the system's power density and integration. Utility Model Content

[0003] The utility model aims to provide an electronically controlled oil pump for a vehicle, comprising a motor rotor assembly, an inner rotor, a motor housing, an oil seal, a pump cover, a heat dissipation cover and a merge ring.

[0004] One end of the motor housing is sealed by a pump cover, and the other end is connected to the slip ring and then sealed by a heat dissipation cover.

[0005] The inner cavity of the motor housing close to one end of the slip ring is the motor cavity.

[0006] A rotor cavity and an oil pump cavity are provided on an end surface of the motor housing close to one end of the pump cover, and the oil pump cavity is located at the bottom of the rotor cavity.

[0007] The inner rotor is located in the rotor cavity.

[0008] A shaft hole is provided at the center of the motor housing and the bottom of the rotor cavity.

[0009] The motor rotor assembly is located in the motor cavity, and its driving shaft passes through the shaft hole and extends into the inner hole of the inner rotor.

[0010] An oil seal is provided inside the motor housing and outside the drive shaft, and the motor cavity and the oil pump cavity inside the motor housing are divided by the oil seal.

[0011] The oil pump cavity includes a pressure relief hole, a lubrication groove, an oil groove I, an oil groove II, a high-pressure cavity and a low-pressure cavity.

[0012] The high-pressure chamber and the low-pressure chamber are arranged inside the motor housing around the shaft hole.

[0013] An oil groove I is provided between the high-pressure chamber and the shaft hole.

[0014] An oil groove II is provided around the shaft hole at the oil seal.

[0015] The lubrication groove is located between the oil groove I and the oil groove II and is arranged around the shaft hole.

[0016] A pressure relief hole is provided between the oil seal and the rotor cavity.

[0017] One end of the pressure relief hole is communicated with the oil tank II, and the other end is communicated with the low-pressure chamber.

[0018] Furthermore, the drive shaft and the inner rotor are in interference fit.

[0019] Furthermore, the drive shaft and the motor housing are fitted with a small clearance.

[0020] Furthermore, the effective fitting length between the drive shaft and the motor housing is 17 mm to 20 mm, and the fitting clearance is 0.02 mm to 0.045 mm.

[0021] Furthermore, a sealing ring I is provided at the connection between the motor housing and the slip ring.

[0022] Furthermore, a sealing gasket is provided at the connection between the slip ring and the heat dissipation cover.

[0023] Furthermore, a pump head sealing ring is provided at the connection between the motor housing and the pump cover.

[0024] Furthermore, a sealing ring II is provided at the bottom of the pump cover.

[0025] The technical effect of the present invention is unquestionable, and the beneficial effects of the present invention are as follows:

[0026] 1. Cost advantage: The structure is simplified, the number of parts is reduced, and the number of rolling bearings, motor covers, motor cover screws, etc. is reduced, so the cost is reduced;

[0027] 2. Simplified assembly process: the number of parts is reduced, so the rolling bearing press-fitting, motor cover assembly, screw tightening and pump head positioning processes are reduced, and only the inner rotor press-fitting process is added;

[0028] 3. Failure mode reduction: Reduce the positioning and installation of the motor cover, and eliminate the failure mode of excessive concentricity between the motor cover and the motor housing shaft hole. With the motor cover removed, no screws are used inside the motor, thus eliminating the risk of screws falling inside the motor during assembly and causing a short circuit.

[0029] 4. Improved NVH performance: An oil pump rotor mounting cavity is added to the motor housing, the pump body is removed and replaced with a pump cover, the oil pump rotor is positioned more accurately, and the assembly's single-octave noise is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the electronically controlled oil pump assembly;

[0031] Figure 2 This is a schematic diagram of the radial design of the lubrication pair;

[0032] Figure 3 It is an enlarged schematic diagram of the oil pump cavity;

[0033] Figure 4 Schematic diagram of the electronically controlled oil pump seal design.

[0034] In the figure: 1-motor rotor assembly; 101-drive shaft; 2-inner rotor; 3-motor housing; 301-pressure relief hole; 302-lubrication groove; 303-oil groove I; 304-high-pressure chamber; 305-low-pressure chamber; 306-oil groove II; 4-oil seal; 5-sealing ring I; 6-sealing gasket; 7-pump head sealing ring; 8-sealing ring II; 9-pump cover; 10-heat dissipation cover; 11-merging ring. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the following examples. However, it should not be understood that the scope of the present invention is limited to the following examples. Without departing from the above technical concept of the present invention, various substitutions and modifications based on common technical knowledge and conventional means in the field should be included in the scope of protection of the present invention.

[0036] Example 1:

[0037] A vehicle electronically controlled oil pump comprises a motor rotor assembly 1, an inner rotor 2, a motor housing 3, an oil seal 4, a pump cover 9, a heat dissipation cover 10 and a slip ring 11.

[0038] One end of the motor housing 3 is sealed by a pump cover 9 , and the other end is connected to a slip ring 11 and then sealed by a heat dissipation cover 10 .

[0039] The inner cavity of the motor housing 3 near the slip ring 11 is the motor cavity.

[0040] The end surface of the motor housing 3 close to the pump cover 9 is provided with a rotor cavity and an oil pump cavity. The oil pump cavity is located at the bottom of the rotor cavity. Figure 1 When the electronically controlled oil pump is placed horizontally, the oil pump cavity is located on the left side of the rotor cavity.

[0041] The inner rotor 2 is located in the rotor cavity.

[0042] An axial hole is provided at the center of the motor housing 3 and the bottom of the rotor cavity.

[0043] The motor rotor assembly 1 is located in the motor cavity, and its drive shaft 101 passes through the shaft hole and extends into the inner hole of the inner rotor 2.

[0044] An oil seal 4 is provided inside the motor housing 3 and outside the drive shaft 101 , and the motor cavity and the oil pump cavity inside the motor housing 3 are divided by the oil seal 4 .

[0045] The oil pump cavity includes a pressure relief hole 301 , a lubrication groove 302 , an oil groove I 303 , an oil groove II 306 , a high-pressure chamber 304 and a low-pressure chamber 305 .

[0046] The high-pressure chamber 304 and the low-pressure chamber 305 are arranged inside the motor housing 3 around the shaft hole.

[0047] An oil groove I303 is provided between the high-pressure chamber 304 and the shaft hole.

[0048] The oil seal 4 is provided with an oil groove II306 around the shaft hole.

[0049] The lubrication groove 302 is located between the oil groove I 303 and the oil groove II 306 and is arranged around the shaft hole.

[0050] A pressure relief hole 301 is provided between the oil seal 4 and the rotor cavity.

[0051] One end of the pressure relief hole 301 is connected to the oil groove II 306 , and the other end is connected to the low-pressure chamber 305 .

[0052] The oil flows from the high-pressure chamber 304 through the oil groove I303 into the gap between the drive shaft 101 and the shaft hole, reaches the lubrication groove 302 and the oil groove II306, and under the action of high pressure, flows from the pressure relief hole 301 into the low-pressure oil chamber 305, completing the lubrication of the shaft and solving the problem of oil blockage in the oil groove II306 under the oil seal 4.

[0053] Example 2:

[0054] The main structure of this embodiment is the same as that of embodiment 1. Furthermore, the drive shaft 101 and the inner rotor 2 are in interference fit.

[0055] Example 3:

[0056] The main structure of this embodiment is the same as any one of Embodiments 1 to 2. Furthermore, the drive shaft 101 and the motor housing 3 are fitted with a small gap.

[0057] Example 4:

[0058] The main structure of this embodiment is the same as any one of Embodiments 1 to 3. Furthermore, the effective fitting length between the drive shaft 101 and the motor housing 3 is 17 mm to 20 mm, and the fitting clearance is 0.02 mm to 0.045 mm.

[0059] Example 5:

[0060] The main structure of this embodiment is the same as any one of Embodiments 1 to 4. Furthermore, a sealing ring I5 is provided at the connection between the motor housing 3 and the slip ring 11 to perform radial sealing.

[0061] Example 6:

[0062] The main structure of this embodiment is the same as any one of Embodiments 1 to 5. Furthermore, a sealing gasket 6 is provided at the connection between the slip ring 11 and the heat dissipation cover 10 .

[0063] Example 7:

[0064] The main structure of this embodiment is the same as any one of Embodiments 1 to 6. Furthermore, a pump head sealing ring 7 is provided at the connection between the motor housing 3 and the pump cover 9.

[0065] Example 8:

[0066] The main structure of this embodiment is the same as any one of Embodiments 1 to 7. Furthermore, a sealing ring II8 is provided at the bottom of the pump cover 9, that is, at the end away from the motor housing.

[0067] Example 9:

[0068] The main structure of this embodiment is the same as any one of Embodiments 1 to 8. Furthermore, the purpose of the present invention is to reduce costs and increase efficiency within a limited space while meeting the cooling performance requirements of most electric vehicles on the market.

[0069] The specific content is: the electronically controlled pump is a dry motor, and an oil seal 4 is used to separate the motor cavity and the oil pump cavity; the motor drive shaft 101 and the inner rotor 2 have an interference fit, so that the motor rotor assembly 1 is axially positioned; the motor drive shaft 101 and the motor housing 3 have a small clearance fit, with an effective fit length of 17mm to 20mm and a fit clearance of 0.02mm to 0.045mm, so that the motor rotor is radially positioned.

[0070] The friction pair lubrication design of the electronically controlled pump assembly is as follows: Figure 2 and Figure 3 An oil groove is designed on the motor housing, and the oil in the high-pressure chamber 304 enters the friction pair with pressure, and a lubrication groove 302 is designed in the middle of the friction pair. When the oil reaches the oil seal 4, it will flow into the low-pressure chamber 305 through the pressure relief hole 301 to form a loop.

[0071] The sealing design of the electronically controlled pump assembly is as follows: Figure 4 As shown, the oil seal 4 and the sealing ring I5 isolate the electronic control cavity from the external environment, and the oil seal 4, the pump head sealing ring 7 and the sealing ring II8 isolate the oil cavity, the electronic control cavity and the external environment.

[0072] The cost of this practical technology is significantly improved, and the DV test effect is good. Compared with the conventional double-rolling bearing motor pump, the assembly efficiency is improved by 1% to 2%. In the conventional electronically controlled pump, the motor assembly and the oil pump cavity are split, and the positioning requirements are too high. The positioning requirements of the pump casing of the utility model electronically controlled pump are reduced, and the noise is significantly improved.

[0073] Example 10:

[0074] The main structure of this embodiment is the same as any one of Embodiments 1 to 9. Furthermore, when the controller 10 receives a signal, it supplies power to the three-phase column of the motor, and the motor rotor assembly 1 begins to rotate under the action of magnetic force. The inner rotor 2 of the oil pump is interference-fitted on the motor shaft 101 and rotates with the motor rotor assembly 1 to achieve the oil pumping function.

[0075] The axial positioning of the motor rotor assembly 1 is mainly determined by the axial positioning of the inner rotor 2. When the inner rotor 2 rotates at high speed in the rotor cavity, the inner rotor 2 is axially limited by the end face of the motor housing 3, and at the same time, it is axially limited by the end face of the pump cover 9. Finally, the motor rotor assembly 1 is reliably axially positioned while rotating; the radial positioning of the motor rotor assembly 1 is positioned by the axial hole of the motor housing 3. When the motor rotor is rotating, the oil in the high-pressure chamber 304 enters the friction pair with pressure, and an oil storage tank 302 is designed in the middle of the friction pair. When the oil reaches the oil seal 4, it will flow into the low-pressure chamber 305 through the pressure relief hole 301, forming a loop, which plays a lubricating role for the radial support.

[0076] Example 11:

[0077] The main structure of this embodiment is the same as any of Embodiments 1-10. Furthermore, the oil pump displacement can meet mainstream cooling requirements in the market, and compared to mainstream electronic oil pumps, it requires 20% fewer components. This reduces fastening screws, eliminates rolling bearings and motor covers, and replaces radial positioning at both ends of the drive shaft with long-distance radial positioning at one end, thereby reducing weight and cost while also minimizing assembly failure modes. This structure is currently unavailable on the domestic market, making it highly competitive.

Claims

1. An electronically controlled oil pump for a vehicle, characterized in that: It comprises a motor rotor assembly (1), an inner rotor (2), a motor housing (3), an oil seal (4), a pump cover (9), a heat dissipation cover (10) and a flow ring (11); One end of the motor housing (3) is sealed by a pump cover (9), and the other end is connected to a collector ring (11) and then sealed by a heat dissipation cover (10); The inner cavity of the motor housing (3) close to one end of the slip ring (11) is the motor cavity; A rotor cavity and an oil pump cavity are provided on an end surface of the motor housing (3) close to one end of the pump cover (9), and the oil pump cavity is located at the bottom of the rotor cavity; The inner rotor (2) is located in the rotor cavity; A shaft hole is provided at the center of the motor housing (3) and the bottom of the rotor cavity; The motor rotor assembly (1) is located in the motor cavity, and its drive shaft (101) passes through the shaft hole and extends into the inner hole of the inner rotor (2); An oil seal (4) is provided inside the motor housing (3) and outside the drive shaft (101), and the motor cavity and the oil pump cavity inside the motor housing (3) are divided by the oil seal (4); The oil pump cavity comprises a pressure relief hole (301), a lubrication groove (302), an oil groove I (303), an oil groove II (306), a high-pressure cavity (304) and a low-pressure cavity (305); The high-pressure chamber (304) and the low-pressure chamber (305) are arranged inside the motor housing (3) around the shaft hole; An oil groove I (303) is provided between the high-pressure chamber (304) and the shaft hole; The oil seal (4) is provided with an oil groove II (306) around the shaft hole; The lubrication groove (302) is located between the oil groove I (303) and the oil groove II (306), and is arranged around the shaft hole; A pressure relief hole (301) is provided between the oil seal (4) and the rotor cavity; One end of the pressure relief hole (301) is in communication with the oil groove II (306), and the other end is in communication with the low-pressure chamber (305).

2. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: The drive shaft (101) and the inner rotor (2) are in interference fit.

3. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: The drive shaft (101) and the motor housing (3) are fitted with a small clearance.

4. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: The effective matching length between the drive shaft (101) and the motor housing (3) is 17 mm to 20 mm, and the matching clearance is 0.02 mm to 0.045 mm.

5. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: A sealing ring I (5) is provided at the connection between the motor housing (3) and the slip ring (11).

6. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: A sealing gasket (6) is provided at the connection between the collector ring (11) and the heat dissipation cover (10).

7. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: A pump head sealing ring (7) is provided at the connection between the motor housing (3) and the pump cover (9).

8. The electronically controlled oil pump for a vehicle according to claim 1, characterized in that: A sealing ring II (8) is provided at the bottom of the pump cover (9).

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