Electric control oil pump structure for vehicle

Abstract

The utility model discloses an electric control oil pump structure for a vehicle. The electric control oil pump structure comprises a motor driving shaft (1), an oil seal (2), a motor shell (3), an inner rotor (4), a check ring (5) and a pump cover (6), compared with a mainstream electronic oil pump, the electronic oil pump has the advantages that the number of parts is reduced by 20%, fastening screws, rolling bearings and motor covers are reduced, two-end radial positioning of the driving shaft is changed into one-end long-distance radial positioning and the like, the weight and the cost are reduced, and meanwhile, assembly failure modes are 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 a vehicle-used electronically controlled oil pump structure. 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 in the supply chain, driving continuous technological advancement and cost reduction.

[0003] In order to reduce the complexity and cost of the system, it is necessary to optimize the overall structural design of the electronically controlled pump to make it more compact and improve the power density and integration of the system. Utility Model Content

[0004] The utility model aims to provide a vehicle electronically controlled oil pump structure, which comprises a motor drive shaft, an oil seal, a motor housing, an inner rotor, a retaining ring and a pump cover.

[0005] The motor drive shaft and the inner rotor are matched and fixed by a retaining ring to achieve axial positioning of the motor drive shaft.

[0006] The motor drive shaft drives the inner rotor to rotate, thereby achieving the oil pumping function.

[0007] The motor drive shaft passes through the motor housing and is fitted with the motor housing with a small gap to achieve radial positioning of the motor drive shaft.

[0008] The motor housing is fixedly connected to the pump cover to form a cavity.

[0009] The oil seal is press-fitted onto the motor housing, and the motor drive shaft passes through the oil seal. A shaft sealing ring is used and arranged inside the cavity to separate the cavity into a motor cavity and an oil pump cavity.

[0010] Furthermore, the motor drive shaft is driven by magnetic force.

[0011] Furthermore, the vehicle electronically controlled oil pump structure adopts a dry motor.

[0012] Furthermore, the motor housing is provided with an axial hole through which the power supply drive shaft passes.

[0013] Furthermore, the effective fitting length between the motor drive shaft and the motor housing is 18 mm, and the fitting clearance is 0.02 mm.

[0014] Furthermore, a rotor cavity for mounting an inner rotor is provided on the motor housing, and the rotor cavity is divided into a high-pressure cavity and a low-pressure cavity according to the positions of the oil inlet and the oil outlet.

[0015] The high-pressure chamber and the low-pressure chamber are both located in the oil pump cavity.

[0016] Furthermore, an oil storage tank, an oil tank, and a pressure relief hole are provided on the motor housing corresponding to the oil pump cavity, and a friction pair is connected thereto.

[0017] The oil reservoir is located in the middle of the friction pair.

[0018] When the motor rotor is in a rotating state, the oil flows from the high-pressure chamber through the friction pair, oil storage tank, pressure relief hole, oil tank, and low-pressure chamber in sequence to form a circuit.

[0019] Furthermore, the oil seal and retaining ring isolate the motor cavity from the external environment.

[0020] Furthermore, it also includes an axial seal, a pump head seal ring and a sealing ring.

[0021] The axial seal, pump head seal and seal ring isolate the motor cavity and oil pump cavity from the external environment.

[0022] The technical effect of the present invention is unquestionable. The technical cost of the present invention is significantly improved, and the DV test effect is good. Compared with the conventional double-rolling bearing motor pump, the assembly efficiency of the present invention is improved by 1% to 2%. In the conventional electronically controlled pump, the motor assembly and the oil pump cavity are split, and there is a transfer dimension in the dimension chain calculation. The electronically controlled pump casing structure provided by the present invention cancels the transfer dimension, effectively improves the position of the motor shaft, and significantly improves the noise.

[0023] The displacement of this oil pump can meet the mainstream cooling needs in the market. Compared with the mainstream electronic oil pump, it has 20% fewer parts, fewer fastening screws, removed rolling bearings and motor covers, and changed the radial positioning at both ends of the drive shaft to long-distance radial positioning at one end, etc., which reduces weight and cost, while reducing assembly failure modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the electronically controlled oil pump assembly;

[0025] Figure 2 This is a schematic diagram of the radial design of the lubrication pair;

[0026] Figure 3 This is a schematic diagram of the axial design of the lubrication pair;

[0027] In the figure, there are a motor drive shaft 1, an oil seal 2, a motor housing 3, an inner rotor 4, a retaining ring 5, a pump cover 6, an oil storage tank 302, and a pressure relief hole 301. DETAILED DESCRIPTION

[0028] 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.

[0029] Example 1:

[0030] See also Figure 1-Figure 3 A vehicle electronically controlled oil pump structure includes a motor drive shaft 1, an oil seal 2, a motor housing 3, an inner rotor 4, a retaining ring 5, and a pump cover 6.

[0031] The motor drive shaft 1 and the inner rotor 4 are matched and fixed by a retaining ring 5 to achieve axial positioning of the motor drive shaft 1.

[0032] The motor drive shaft 1 drives the inner rotor 4 to rotate, thereby achieving an oil pumping function.

[0033] The motor drive shaft 1 passes through the motor housing 3 and is fitted with the motor housing 3 with a small gap to achieve radial positioning of the motor drive shaft 1.

[0034] The motor housing 3 is fixedly connected to the pump cover 6 to form a cavity.

[0035] The oil seal 2 is press-fitted onto the motor housing 3 , and the motor drive shaft 1 passes through the oil seal. A shaft sealing ring is used and arranged inside the cavity to separate the cavity into a motor cavity and an oil pump cavity.

[0036] The motor drive shaft 1 is driven by magnetic force.

[0037] The vehicle-used electronically controlled oil pump structure adopts a dry-type motor.

[0038] The motor housing 3 is provided with an axial hole through which the power supply drive shaft 1 passes.

[0039] The effective fitting length between the motor drive shaft 1 and the motor housing 3 is 18 mm, and the fitting clearance is 0.02 mm.

[0040] The motor housing 3 is provided with a rotor cavity for mounting the inner rotor 4 , and the rotor cavity is divided into a high-pressure cavity and a low-pressure cavity according to the positions of the oil inlet and the oil outlet.

[0041] The high-pressure chamber and the low-pressure chamber are both located in the oil pump cavity.

[0042] An oil storage tank 302 , an oil tank, a pressure relief hole 301 are provided on the motor housing 3 corresponding to the oil pump cavity, and a friction pair is connected thereto.

[0043] The oil storage tank 302 is located in the middle of the friction pair.

[0044] When the motor rotor is in a rotating state, the oil flows from the high-pressure chamber through the friction pair, the oil storage tank 302, the pressure relief hole 301, the oil tank, and the low-pressure chamber in sequence to form a loop.

[0045] The oil seal 2 and retaining ring 5 isolate the motor cavity from the external environment.

[0046] Example 2:

[0047] A vehicle electronically controlled oil pump structure includes a motor drive shaft 1, an oil seal 2, a motor housing 3, an inner rotor 4, a retaining ring 5, and a pump cover 6.

[0048] The motor drive shaft 1 and the inner rotor 4 are matched and fixed by a retaining ring 5 to achieve axial positioning of the motor drive shaft 1.

[0049] The motor drive shaft 1 drives the inner rotor 4 to rotate, thereby achieving an oil pumping function.

[0050] The motor drive shaft 1 passes through the motor housing 3 and is fitted with the motor housing 3 with a small gap to achieve radial positioning of the motor drive shaft 1.

[0051] The motor housing 3 is fixedly connected to the pump cover 6 to form a cavity.

[0052] The oil seal 2 is arranged inside the cavity, dividing the cavity into a motor cavity and an oil pump cavity.

[0053] Example 3:

[0054] A vehicle electronically controlled oil pump structure has the same technical content as embodiment 2, and further, the motor drive shaft 1 is driven by magnetic force.

[0055] Example 4:

[0056] A vehicle-use electronically controlled oil pump structure, the technical content of which is the same as any one of Examples 2-3, further, the vehicle-use electronically controlled oil pump structure adopts a dry motor.

[0057] Example 5:

[0058] A vehicle-use electronically controlled oil pump structure has the same technical content as any one of embodiments 2-4. Furthermore, the motor housing 3 is provided with an axial hole through which the power supply drive shaft 1 passes.

[0059] Example 6:

[0060] A vehicle electronically controlled oil pump structure has the same technical content as any one of embodiments 2-5, and further, the effective fitting length of the motor drive shaft 1 and the motor housing 3 is 18 mm, and the fitting clearance is 0.02 mm.

[0061] Example 7:

[0062] A vehicle-use electronically controlled oil pump structure, the technical content of which is the same as any one of Examples 2-6. Furthermore, a rotor cavity for mounting an inner rotor 4 is provided on the motor housing 3, and the rotor cavity is divided into a high-pressure cavity and a low-pressure cavity according to the positions of the oil inlet and the oil outlet.

[0063] The high-pressure chamber and the low-pressure chamber are both located in the oil pump cavity.

[0064] Example 8:

[0065] A vehicle electronically controlled oil pump structure, the technical content of which is the same as any one of Examples 2-7. Furthermore, an oil storage tank 302, an oil tank, a pressure relief hole 301 are provided on the motor housing 3 corresponding to the oil pump cavity, and a friction pair is connected.

[0066] The oil storage tank 302 is located in the middle of the friction pair.

[0067] When the motor rotor is in a rotating state, the oil flows from the high-pressure chamber through the friction pair, the oil storage tank 302, the pressure relief hole 301, the oil tank, and the low-pressure chamber in sequence to form a loop.

[0068] Example 9:

[0069] A vehicle electronically controlled oil pump structure, the technical content of which is the same as any one of Examples 2-8, further, the oil seal 2 and retaining ring 5 isolate the motor cavity from the external environment.

[0070] Example 10:

[0071] An electronically controlled oil pump structure for a vehicle, comprising a motor drive shaft, an oil seal, a motor housing, an inner rotor, a retaining ring, and a pump cover;

[0072] The motor drive shaft 1 is axially positioned by the retaining ring 5 and the pump cover 6, radially positioned by the motor housing 3, sealed by the oil seal 2, and oil film support and lubrication are formed by the oil circuit design of the motor housing 3.

[0073] Example 1':

[0074] A vehicle-use electronically controlled oil pump structure, the electronically controlled pump having a dry-type motor, an oil seal 2 separating the motor cavity from the oil pump cavity; a motor drive shaft 1 and an inner rotor 2 are secured with a retaining ring 5, thereby positioning the motor drive shaft 1 axially; the motor drive shaft 1 and the motor housing 3 are fitted with a small clearance, with an effective fit length of 18 mm and a fit clearance of 0.02 mm, thereby positioning the motor rotor radially;

[0075] 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, Figure 1The oil in the high-pressure chamber 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 oil tank through the pressure relief hole 301 and then into the low-pressure chamber to form a loop.

[0076] The oil seal 4 and the radial seal 5 isolate the electronic control cavity from the external environment.

[0077] Example 13:

[0078] A vehicle electronically controlled oil pump structure. When the controller receives a signal, it supplies power to the three-phase column of the motor. The motor rotor assembly 1 starts to rotate under the action of magnetic force. The flat square of the inner rotor 4 of the oil pump fits on the motor shaft 101 and rotates with the motor rotor assembly 1 to achieve the oil pumping function. The axial positioning of the motor rotor assembly 1 is mainly achieved through the axial positioning of the retaining ring 5. When the inner rotor 2 runs at high speed in the rotor cavity, the inner rotor 4 is axially limited by the end face of the motor housing 3 and the end face of the pump cover 6. Finally, the motor rotor assembly 1 is reliably axially positioned while rotating. The radial positioning of the motor rotor assembly 1 is based on the axial hole of the motor housing 3. When the motor rotor rotates, the oil in the high-pressure chamber enters the friction pair with the pressure, and an oil storage tank 302 is designed in the middle of the friction pair. When the oil reaches the oil seal 2, it will flow into the oil tank through the pressure relief hole 301 and then enter the low-pressure chamber to form a circuit, which plays a lubricating role for the radial support.

[0079] The beneficial effects of the vehicle electronically controlled oil pump structure are as follows:

[0080] 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;

[0081] 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;

[0082] 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.

[0083] 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 single-octave noise is smaller.

Claims

1. A vehicle electronically controlled oil pump structure, characterized by: It comprises a motor drive shaft (1), an oil seal (2), a motor housing (3), an inner rotor (4), a retaining ring (5), and a pump cover (6); The motor drive shaft (1) and the inner rotor (4) are matched and fixed by a retaining ring (5) to achieve axial positioning of the motor drive shaft (1); The motor drive shaft (1) drives the inner rotor (4) to rotate, thereby achieving an oil pumping function; The motor drive shaft (1) passes through the motor housing (3) and is fitted with the motor housing (3) with a small clearance, thereby achieving radial positioning of the motor drive shaft (1); The motor housing (3) is fixedly connected to the pump cover (6) to form a cavity; The oil seal (2) is press-fitted onto the motor housing (3), and the motor drive shaft (1) passes through the oil seal. A shaft sealing ring is arranged inside the cavity to separate the cavity into a motor cavity and an oil pump cavity.

2. The electronically controlled oil pump structure for a vehicle according to claim 1, characterized in that: The motor drive shaft (1) is driven by magnetic force.

3. The electronically controlled oil pump structure for a vehicle according to claim 1, characterized in that: The vehicle-used electronically controlled oil pump structure adopts a dry-type motor.

4. The electronically controlled oil pump structure for a vehicle according to claim 1, characterized in that: The motor housing (3) is provided with a shaft hole through which the power supply motor drive shaft (1) passes.

5. The electronically controlled oil pump structure for a vehicle according to claim 1, characterized in that: The effective fitting length between the motor drive shaft (1) and the motor housing (3) is 18 mm, and the fitting clearance is 0.02 mm.

6. The vehicle electronically controlled oil pump structure according to claim 1, characterized in that: The motor housing (3) is provided with a rotor cavity for mounting an inner rotor (4), and the rotor cavity is divided into a high-pressure cavity and a low-pressure cavity according to the positions of the oil inlet and the oil outlet; The high-pressure chamber and the low-pressure chamber are both located in the oil pump cavity.

7. The vehicle electronically controlled oil pump structure according to claim 6, characterized in that: An oil storage tank (302), an oil tank, and a pressure relief hole (301) are provided on the motor housing (3) corresponding to the oil pump cavity; The oil storage tank (302) is located in the middle of the friction pair; When the motor rotor is in a rotating state, the oil flows from the high-pressure chamber through the friction pair, the oil storage tank (302), the pressure relief hole (301), the oil tank, and the low-pressure chamber in sequence to form a loop.

8. The vehicle electronically controlled oil pump structure according to claim 1, characterized in that: The oil seal (2) and retaining ring (5) isolate the motor cavity from the external environment.

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