Electronic control oil pump driving structure for vehicle

Abstract

The utility model discloses an electric control oil pump driving structure for a vehicle. The electric control oil pump driving structure comprises an oil pump inner rotor, a motor rotor assembly and a motor shell. One end of the motor shell is a cavity, the cavity is a motor cavity for accommodating a motor rotor assembly, and the end face of the other end of the motor shell is provided with a rotor cavity for placing an inner rotor of an oil pump and an oil pump cavity positioned below the rotor cavity. A shaft hole is formed in the center of the motor shell and below the rotor cavity, and a driving shaft of the motor rotor assembly penetrates through the shaft hole and extends into an inner hole of the oil pump inner rotor to position and drive the oil pump inner rotor. The part, extending into the inner hole, of the driving shaft sequentially comprises a driving section and a positioning section so that the inner hole of the oil pump inner rotor can be divided into a driving inner hole and a positioning inner hole, and the outer contour shape of the driving section is matched with the shape of the driving inner hole. 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 a driving structure of 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, prompting a race for performance at the same cost, with noise being one of the most important performance indicators.

[0003] Therefore, it is necessary to provide a new vehicle electronically controlled oil pump drive structure. Utility Model Content

[0004] The utility model aims to provide a vehicle-used electronically controlled oil pump driving structure, comprising an oil pump inner rotor, a motor rotor assembly and a motor housing.

[0005] One end of the motor housing is a cavity, and the cavity is a motor cavity.

[0006] A rotor cavity and an oil pump cavity are provided on the end surface of the other end of the motor housing.

[0007] The oil pump cavity is located below the rotor cavity.

[0008] The oil pump inner rotor is located in the rotor cavity.

[0009] An axial hole is provided at the center of the motor housing and below the rotor cavity.

[0010] The motor rotor assembly is located in the motor cavity, and the drive shaft of the motor rotor assembly passes through the shaft hole and extends into the inner hole of the oil pump inner rotor.

[0011] The portion of the drive shaft extending into the inner hole comprises a drive section and a positioning section in sequence.

[0012] The driving section and the positioning section divide the inner hole of the inner rotor of the oil pump into a driving inner hole and a positioning inner hole, and the driving inner hole is a waist-shaped hole.

[0013] 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.

[0014] Furthermore, the relationship between the length D of the positioning inner hole and the thickness T of the oil pump inner rotor is 2 / 3T≤D≤3 / 4T.

[0015] Furthermore, the positioning clearance between the positioning section and the positioning inner hole is 0.03 mm to 0.08 mm.

[0016] Furthermore, the waist-shaped hole is a curved waist-shaped hole, and its cross-sectional shape is formed by connecting two symmetrical arcs with openings facing inward and two symmetrical arcs with openings facing outward in sequence.

[0017] Furthermore, the radius of the arc segment with the opening facing inward is recorded as r, and the radius of the arc segment with the opening facing outward is recorded as R, where R is equal to 5r, and 2r>d, and d is the diameter of the positioning inner hole.

[0018] Furthermore, the drive shaft is positioned by a rolling bearing.

[0019] Furthermore, an elastic washer is provided on the outer sleeve of the drive shaft in the motor housing.

[0020] Furthermore, the outer contour of the driving section is adapted to the shape of the driving inner hole of the inner rotor of the oil pump.

[0021] The technical effect of the present invention is unquestionable, and the beneficial effects of the present invention are as follows:

[0022] 1. Cost advantage: The structure is simple, without the traditional needle roller and spline design, and without the additional inner rotor positioning components, saving costs in parts and processes;

[0023] 2. Simplified assembly process: fewer parts and no press-fitting process, reducing process inspection frequency and failure;

[0024] 3. Failure mode reduction: The motor drive shaft simultaneously positions the motor rotor and the oil pump rotor, ensuring good coaxiality of the two rotors, reducing the failure of the key position of the oil pump inner rotor and the motor inner rotor;

[0025] 4. Improved NVH performance: The motor drive shaft both positions and drives the inner rotor of the oil pump, and the relationship between the positioning length D and the rotor thickness T is 2 / 3T≤D≤3 / 4T, that is, the positioning part is much larger than the driving part, and the flat square drive adopts an arc design, which reduces the impact of burrs or chamfers on the inner rotor, helping to improve the NVH level. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the electronically controlled oil pump assembly;

[0027] Figure 2 This is a schematic diagram of the design of the driving shaft hole depth of the inner rotor;

[0028] Figure 3 Schematic diagram of the waist-shaped hole design of the inner rotor.

[0029] In the figure: 1-drive shaft; 101-drive section; 102-positioning section; 2-oil seal; 3-oil pump inner rotor; 4-rolling bearing; 5-elastic washer; 6-motor rotor assembly; 7-motor housing. 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 Figure 1 A vehicle electronically controlled oil pump drive structure includes an oil pump inner rotor 3, a motor rotor assembly 6 and a motor housing 7.

[0033] One end of the motor housing 7 is a cavity, and the cavity is the motor cavity.

[0034] A rotor cavity and an oil pump cavity are provided on the end surface of the other end of the motor housing 7 .

[0035] The oil pump cavity is located below the rotor cavity. Figure 1 When the vehicle electronic oil pump drive structure is placed horizontally, the oil pump cavity is located on the left side of the rotor cavity.

[0036] The oil pump inner rotor 3 is located in the rotor cavity.

[0037] An axial hole is provided at the center of the motor housing 7 and below the rotor cavity.

[0038] The motor rotor assembly 6 is located in the motor cavity, and the drive shaft 1 of the motor rotor assembly 6 passes through the shaft hole and extends into the inner hole of the oil pump inner rotor 3.

[0039] The portion of the drive shaft 1 extending into the inner hole includes a drive section 101 and a positioning section 102 in sequence.

[0040] The driving section 101 and the positioning section 102 divide the inner hole of the oil pump inner rotor 3 into a driving inner hole and a positioning inner hole. The driving inner hole is a waist-shaped hole, and the driving section 101 is a flat square design, which is adapted to the shape of the driving inner hole.

[0041] An oil seal 2 is provided inside the motor housing 7 and outside the drive shaft 1 , and the oil seal 2 separates the motor cavity and the oil pump cavity inside the motor housing 7 .

[0042] Example 2:

[0043] The main structure of this embodiment is the same as that of embodiment 1. Figure 2 The relationship between the length D of the positioning inner hole and the thickness T of the oil pump inner rotor is 2 / 3T≤D≤3 / 4T.

[0044] Example 3:

[0045] The main structure of this embodiment is the same as any one of Embodiments 1 to 2. Furthermore, the positioning clearance between the positioning section 102 and the positioning inner hole is 0.03 mm to 0.08 mm.

[0046] Example 4:

[0047] The main structure of this embodiment is the same as any one of embodiments 1 to 3. Figure 3 The waist-shaped hole is a curved waist-shaped hole, and its cross-sectional shape is formed by connecting two symmetrical arcs with openings facing inward and two openings facing outward in sequence.

[0048] The opening facing inwards refers to facing the inner hole, and the opening facing outwards refers to facing away from the inner hole.

[0049] Example 5:

[0050] The main structure of this embodiment is the same as any one of embodiments 1 to 4. Figure 3 , the radius of the arc segment with the opening facing inward is recorded as r, and the radius of the arc segment with the opening facing outward is recorded as R, where R≈5r, and 2r>d, d is the diameter of the positioning inner hole.

[0051] Example 6:

[0052] The main structure of this embodiment is the same as any one of Embodiments 1 to 5. Furthermore, the drive shaft 1 is positioned by a rolling bearing 4.

[0053] See also Figure 1 In this embodiment, positioning is performed by two rolling bearings 4 , one of which is located in the motor housing 7 , close to the oil pump inner rotor 3 , and the other is located in the cavity of the motor housing 7 , close to the motor rotor assembly 6 .

[0054] Example 7:

[0055] The main structure of this embodiment is the same as any one of embodiments 1 to 6. Figure 1 In the motor housing 7 , an elastic washer 5 is provided on the outer sleeve of the drive shaft 1 to compensate for the axial movement of the drive shaft 1 .

[0056] Example 8:

[0057] The main structure of this embodiment is the same as any one of Embodiments 1 to 7. Furthermore, the outer contour of the driving section 101 is adapted to the shape of the driving inner hole of the oil pump inner rotor 3 .

[0058] Example 9:

[0059] The main structure of this embodiment is the same as any one of embodiments 1 to 8. Furthermore, the purpose of this utility model is to optimize the design of performance within a limited space while meeting the cooling performance requirements of most electric vehicles on the market.

[0060] The specific content is: the electronically controlled pump is a dry motor, and an oil seal 2 is used to separate the motor cavity and the oil pump cavity; the motor drive shaft is positioned by two rolling bearings 4, and the axial clearance is compensated by an elastic washer 5. The motor drive shaft 1 both positions and drives the inner rotor 3, and the relationship between the positioning length D and the rotor thickness T is 2 / 3T≤D≤3 / 4T, and the positioning clearance is 0.03mm~0.08mm; the inner rotor drive part is designed as a waist-shaped hole, R≈5r, and 2r>φd.

[0061] This practical technology has significant cost improvements, does not add components such as needle rollers and positioning shafts, has fewer parts, and has a low risk of failure. Compared with the press-fit rotor process, the assembly process is simplified, and the positioning and drive coaxiality are high. The design of the waist-shaped hole arc reduces the chamfer requirements of the drive shaft, and the noise is significantly improved.

[0062] Example 10:

[0063] The main structure of this embodiment is the same as any one of Embodiments 1 to 9. Furthermore, when the controller sends an instruction to the motor, the motor rotor drives the drive shaft 1 to start rotating under the action of the magnetic force. The motor drive shaft will have a small axial movement under the action of the magnetic field. The inner rotor of the oil pump has no axial force on the drive shaft. The washer compensates for the axial movement, so that the motor rotor does not undergo axial transmission during startup.

[0064] The motor drive shaft positioning section 102 radially positions the inner rotor, ensuring high coaxiality between the oil pump's inner rotor and the motor rotor, minimizing imbalance. The motor shaft's drive section 101 engages the inner rotor's waist-shaped hole to drive the inner rotor's rotation. During this process, the inner rotor is unaffected by axial forces, maintaining axial balance within the low-pressure pump's hydraulic environment and driving the outer rotor to pump oil.

Claims

1. A vehicle electronically controlled oil pump drive structure, characterized by: It comprises an oil pump inner rotor (3), a motor rotor assembly (6) and a motor housing (7); One end of the motor housing (7) is a cavity, and the cavity is a motor cavity; A rotor cavity and an oil pump cavity are provided on the end surface of the other end of the motor housing (7); The oil pump cavity is located below the rotor cavity; The oil pump inner rotor (3) is located in the rotor cavity; A shaft hole is provided at the center of the motor housing (7) and below the rotor cavity; The motor rotor assembly (6) is located in the motor cavity, and the drive shaft (1) of the motor rotor assembly (6) passes through the shaft hole and extends into the inner hole of the oil pump inner rotor (3); The portion of the drive shaft (1) extending into the inner hole comprises a drive section (101) and a positioning section (102) in sequence; The driving section (101) and the positioning section (102) divide the inner hole of the oil pump inner rotor (3) into a driving inner hole and a positioning inner hole; the driving inner hole is a waist-shaped hole; An oil seal (2) is provided outside the drive shaft (1) in the motor housing (7), and the motor cavity and the oil pump cavity inside the motor housing (7) are divided by the oil seal (2).

2. The vehicle electronically controlled oil pump drive structure according to claim 1, characterized in that: The relationship between the length D of the positioning inner hole and the thickness T of the oil pump inner rotor is 2 / 3T≤D≤3 / 4T.

3. The vehicle electronically controlled oil pump drive structure according to claim 1 or 2, characterized in that: The positioning clearance between the positioning section (102) and the positioning inner hole is 0.03 mm to 0.08 mm.

4. The vehicle electronically controlled oil pump drive structure according to claim 1, characterized in that: The waist-shaped hole is a curved waist-shaped hole, and its cross-section is formed by connecting two symmetrical arcs with openings facing inward and two symmetrical arcs with openings facing outward in sequence.

5. The vehicle electronically controlled oil pump drive structure according to claim 4, characterized in that: The radius of the arc segment with the opening facing inward is recorded as r, and the radius of the arc segment with the opening facing outward is recorded as R, where R is equal to 5r, and 2r>d, and d is the diameter of the positioning inner hole.

6. The vehicle electronically controlled oil pump drive structure according to claim 1, characterized in that: The drive shaft (1) is positioned via a rolling bearing (4).

7. The vehicle electronically controlled oil pump drive structure according to claim 1, characterized in that: Inside the motor housing (7), an elastic washer (5) is provided on the outer cover of the drive shaft (1).

8. The vehicle electronically controlled oil pump drive structure according to any one of claims 1 to 2 and 4 to 7, characterized in that: The outer contour shape of the driving section (101) is adapted to the shape of the driving inner hole of the oil pump inner rotor (3).

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