Integrated shaft electric drive assembly structure and vehicle

Abstract

The integrated shaft electric drive assembly structure comprises a shell, a rotating shaft arranged in the shell, a stator and rotor mechanism and a speed reducing mechanism, the stator and rotor mechanism and the speed reducing mechanism are coaxially connected to the rotating shaft, and the rotating shaft comprises a motor shaft section coaxially connected with the stator and rotor mechanism and a speed reducer shaft section coaxially connected with the speed reducing mechanism; the rotating shaft is coaxially connected with a plurality of bearings at intervals in the axial direction of the rotating shaft. And an integrated shaft structure integrating the motor shaft and the speed reducer shaft is adopted, so that the number of parts is reduced, and the overall structure is simplified. Compared with a traditional split type shaft structure, additional connecting parts and complex assembling procedures are not needed, the production cost is reduced, the production efficiency is improved, the NVH performance of a vehicle is optimized, and the size of an electric drive assembly is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of parts for new energy vehicles, and in particular to an integrated shaft electric drive assembly structure and a vehicle. Background Art

[0002] As the market share of new energy vehicles increases, users have higher and higher requirements for vehicle space, which directly leads to the compression of the layout space of various components by the OEM. For the electric drive assembly, on the one hand, the requirements for motor power density are getting higher and higher, and on the other hand, the requirements for reducing components and thus reducing the size of the electric drive assembly. In addition, as the phenomenon of charging clusters becomes more and more serious, consumers' demand for fast charging and high energy efficiency becomes increasingly prominent. For suppliers of new energy vehicle electric drive assemblies, high-voltage technology is gradually becoming the mainstream trend of the industry, and high voltage is bound to involve the problem of electrical corrosion of bearings.

[0003] At present, most of the electric drive assemblies on the market are arranged separately for the motor shaft and the reducer input shaft, and each shaft is supported by two bearings. The motor shaft and the reducer input shaft are connected by splines. Some related companies also use three bearings to support the motor shaft and the reducer input shaft, but the motor shaft and the reducer input shaft are still separated. The intermediate bearing is either distributed on the motor shaft or on the reducer input shaft. The motor shaft and the reducer input shaft are matched by optical shafts and splines. For high-voltage electric drives, some manufacturers use ceramic bearings to directly block the conductive circuit, and some manufacturers use conductive bearings or conductive rings to derive the shaft voltage to prevent electrical corrosion of the bearings.

[0004] The motor shaft and the reducer input shaft are connected by splines. In the solution where each shaft is supported by two bearings, the spline connection is likely to cause NVH problems in the vehicle. Spline processing and the number of bearings will increase costs. At the same time, the solution where the motor shaft and the reducer input shaft are split shafts will also increase the Y-axis length of the electric drive assembly. The installation position of the conductive ring in the electric drive assembly is farther from the shaft voltage generation end than the bearing, and the shaft current cannot be well derived, which will still cause electrical corrosion of the bearing. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide an integrated shaft electric drive assembly structure and a vehicle which can effectively prevent the bearing from suffering from electrical corrosion and has a small size and low cost.

[0006] To achieve this object, the integrated shaft electric drive assembly structure designed in the present invention includes a housing, a rotating shaft arranged inside the housing, and a stator-rotor mechanism and a reduction mechanism coaxially connected to the rotating shaft, the rotating shaft includes a motor shaft section coaxially connected to the stator-rotor mechanism and a reducer shaft section coaxially connected to the reduction mechanism, and the rotating shaft is coaxially connected to multiple bearings at intervals along its axial direction.

[0007] Furthermore, the integrated shaft electric drive assembly structure also includes a conductive ring coaxially connected to the rotating shaft, and the conductive ring is close to the shaft voltage generating end.

[0008] Furthermore, a pressure plate structure is connected between the rotating shaft and the housing to prevent the rotating shaft from axially moving.

[0009] Furthermore, the pressure plate structure includes a pressure plate ring fixed on the middle inner surface of the shell, the pressure plate ring is coaxially arranged with the rotating shaft, and the bearing includes a middle bearing coaxially connected to the middle of the rotating shaft, and the middle bearing is axially pressed between one end face of the pressure plate ring and the shoulder of the middle inner surface of the shell.

[0010] Furthermore, the conductive ring is coaxially fixed on the pressure plate ring.

[0011] Furthermore, the conductive ring is located between the stator-rotor mechanism and the speed reduction mechanism.

[0012] Furthermore, the conductive ring is close to the stator-rotor mechanism.

[0013] Furthermore, the bearing includes a first end bearing and a second end bearing coaxially connected to both ends of the rotating shaft, the first end bearing is coaxially connected to the motor shaft section, and the second end bearing is coaxially connected to the reducer shaft section.

[0014] Furthermore, the middle bearing and the second end bearing are used to support the rotating shaft, and the first end bearing is used to guide the rotating shaft to rotate.

[0015] Still further, a vehicle comprises the above-mentioned integrated shaft electric drive assembly structure.

[0016] The beneficial effects of the present invention are: the one-piece shaft structure integrating the motor shaft and the reducer shaft is adopted, which reduces the number of components and simplifies the overall structure. Compared with the traditional split shaft structure, no additional connecting parts and complex assembly processes are required, which not only reduces the production cost, but also improves the production efficiency, optimizes the NVH performance of the vehicle, and reduces the size of the electric drive assembly. The one-piece shaft ensures the coaxiality between the motor and the reducer. During the power transmission process, the vibration, noise and energy loss caused by the inaccurate shaft connection are minimized, making the power transmission more stable and efficient, and improving the overall performance of the electric drive assembly. Multiple bearings are coaxially connected at intervals along the axial direction, including a middle bearing, a first end bearing at both ends, and a second end bearing. This layout provides all-round stable support for the one-piece shaft, which can effectively withstand radial and axial loads under different working conditions. For example, during the driving of the vehicle, facing complex road conditions such as acceleration, deceleration, and turning, the multi-bearing structure can ensure the stable operation of the shaft, reduce shaking, and extend the service life. The middle bearing and the second end bearing are mainly used to support the rotating shaft, bear large radial forces, and ensure that the rotating shaft does not deviate when rotating at high speed; the first end bearing focuses on guiding the rotation of the rotating shaft and optimizing the rotation accuracy of the rotating shaft. The synergistic effect makes the rotating shaft run more smoothly and reliably. Equipped with a conductive ring close to the shaft voltage generating end, it can timely guide the accumulated charge on the shaft, effectively suppress the generation of shaft voltage, and reduce the risk of electrical corrosion of shaft current to bearings and other components. When the electric drive system runs for a long time, it can prevent problems such as bearing damage and lubrication failure caused by excessive shaft voltage, and improve the reliability and stability of the system. The pressure plate structure, especially the pressure plate ring fixed on the inner surface of the middle part of the shell, cooperates with the middle bearing to axially constrain the rotating shaft. The clamping space formed by the pressure plate ring and the middle bearing can accurately limit the axial movement of the rotating shaft, ensuring that the rotating shaft always maintains the correct axial position under high-speed operation and complex working conditions, avoiding collision and friction with other components, and further ensuring the safe and stable operation of the electric drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the integrated shaft electric drive assembly structure of the present invention;

[0018] Figure 2 for Figure 1 Middle AA section view;

[0019] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0020] Among them, 1 is the housing (1.1 is the main housing, 1.2 is the left housing, 1.3 is the end cover), 2 is the rotating shaft (2.1 is the motor shaft section, 2.2 is the reducer shaft section), 3 is the stator-rotor mechanism, 4 is the reduction mechanism, 5 is the conductive ring, 6 is the pressure plate ring, 7 is the middle bearing, 8 is the shaft shoulder, 9 is the first end bearing, and 10 is the second end bearing. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] like Figure 1 —3, in certain embodiments, the integrated shaft electric drive assembly structure designed by the present invention includes a housing 1, a rotating shaft 2 arranged inside the housing 1, and a stator-rotor mechanism 3 and a reduction mechanism 4 coaxially connected to the rotating shaft 2, the rotating shaft 2 includes a motor shaft section 2.1 coaxially connected to the stator-rotor mechanism 3 and a reducer shaft section 2.2 coaxially connected to the reduction mechanism 4, the rotating shaft 2 is coaxially connected to a plurality of bearings at intervals along its axial direction, and a conductive ring 5 is coaxially connected to the rotating shaft 2, and the conductive ring 5 is close to the shaft voltage generating end.

[0023] Embodiment 1

[0024] On the basis of some of the above embodiments, a pressure plate structure is connected between the rotating shaft 2 and the housing 1 to prevent the rotating shaft 2 from axially moving. The pressure plate structure includes a pressure plate ring 6 fixed on the middle inner surface of the housing 1, the pressure plate ring 6 is coaxially arranged with the rotating shaft 2, and the bearing includes a middle bearing 7 coaxially connected to the middle of the rotating shaft, and the middle bearing 7 is axially pressed between one end face of the pressure plate ring 6 and the shoulder 8 on the middle inner surface of the housing 1. The conductive ring 5 is coaxially fixed on the pressure plate ring 6. The conductive ring 5 is located between the stator-rotor mechanism 3 and the reduction mechanism 4. And the conductive ring 5 is close to the stator-rotor mechanism 3.

[0025] Embodiment 2

[0026] Based on some of the above embodiments or embodiment 2, the bearing includes a first end bearing 9 and a second end bearing 10 coaxially connected to both ends of the rotating shaft 2, the first end bearing 9 is coaxially connected to the motor shaft section 2.1, and the second end bearing 10 is coaxially connected to the reducer shaft section 2.2. The middle bearing 7 and the second end bearing 10 are used to support the rotating shaft 2, and the first end bearing 9 is used to guide the rotating shaft 2 to rotate.

[0027] Embodiment 3

[0028] Based on some of the above embodiments or embodiment one or embodiment two, a vehicle is provided, comprising the above-mentioned integrated shaft electric drive assembly structure.

[0029] In the present invention, the housing 1 is composed of a main housing 1.1, a left housing 1.2 and an end cover 1.3, and the rotating shaft 2 is an integrated shaft structure in which a motor shaft and a reducer shaft are integrated.

[0030] By adopting an integrated shaft structure integrating the motor shaft and the reducer shaft, the number of components is reduced and the overall structure is simplified. Compared with the traditional split shaft structure, no additional connecting parts and complex assembly processes are required, which not only reduces the production cost, but also improves the production efficiency, optimizes the NVH performance of the vehicle, and reduces the size of the electric drive assembly. The integrated shaft ensures the coaxiality between the motor and the reducer. During the power transmission process, the vibration, noise and energy loss caused by the inaccurate shaft connection are minimized, making the power transmission more stable and efficient, and improving the overall performance of the electric drive assembly. Multiple bearings are coaxially connected at intervals along the axial direction, including the middle bearing 7, the first end bearing 9 and the second end bearing 10 at both ends. This layout provides all-round stable support for the integrated shaft, which can effectively withstand radial and axial loads under different working conditions. For example, during the driving process of the vehicle, facing complex road conditions such as acceleration, deceleration, and turning, the multi-bearing structure can ensure the stable operation of the shaft, reduce shaking, and extend the service life. The middle bearing 7 and the second end bearing 10 are mainly used to support the rotating shaft 2, bear a large radial force, and ensure that the rotating shaft 2 does not deviate when rotating at high speed; the first end bearing 9 focuses on guiding the rotation of the rotating shaft 2, optimizing the rotation accuracy of the rotating shaft 2, and the synergistic effect makes the rotating shaft 2 run more smoothly and reliably. Equipped with a conductive ring 5 close to the shaft voltage generating end, it can timely guide the accumulated charge on the shaft, effectively suppress the generation of shaft voltage, and reduce the risk of electrical corrosion of shaft current to bearings and other components. When the electric drive system runs for a long time, it can prevent problems such as bearing damage and lubrication failure caused by excessive shaft voltage, and improve the reliability and stability of the system. The rotating shaft 2 is axially constrained by the pressure plate structure, especially the pressure plate ring 6 fixed to the inner surface of the middle part of the housing 1, in cooperation with the middle bearing 7. The clamping space formed by the pressure plate ring 6 and the middle bearing 7 can accurately limit the axial movement of the rotating shaft 2, ensuring that the rotating shaft 2 always maintains the correct axial position under high-speed operation and complex working conditions, avoiding collision and friction with other components, and further ensuring the safe and stable operation of the electric drive assembly.

[0031] Here, it should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, another part or other parts may also be provided, and the terms used may generally be singular but may also represent plural forms. It should be noted that although the terms "first", "second", "top", "bottom", "one side", "other side", "one end", "other end", etc. may appear and be used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component, and the components at the top and bottom may also be interchanged or converted with each other under certain circumstances; the components at one end and the other end may have the same or different performances. Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. An integrated shaft electric drive assembly structure, comprising a housing (1), a rotating shaft (2) arranged inside the housing (1), and a stator-rotor mechanism (3) and a speed reduction mechanism (4) coaxially connected to the rotating shaft (2), characterized in that: The rotating shaft (2) comprises a motor shaft section (2.1) coaxially connected to the stator-rotor mechanism (3) and a reducer shaft section (2.2) coaxially connected to the reduction mechanism (4); the rotating shaft (2) is coaxially connected to a plurality of bearings at intervals along its axial direction.

2. The integrated shaft electric drive assembly structure according to claim 1, characterized in that: It also includes a conductive ring (5) coaxially connected to the rotating shaft (2), and the conductive ring (5) is close to the shaft voltage generating end.

3. The integrated shaft electric drive assembly structure according to claim 2, characterized in that: A pressure plate structure is connected between the rotating shaft (2) and the housing (1) to prevent the rotating shaft (2) from axial movement.

4. The integrated shaft electric drive assembly structure according to claim 3, characterized in that: The pressure plate structure comprises a pressure plate ring (6) fixed on the middle inner surface of the shell (1), the pressure plate ring (6) is coaxially arranged with the rotating shaft (2), the bearing comprises a middle bearing (7) coaxially connected to the middle of the rotating shaft, the middle bearing (7) is axially pressed between one end face of the pressure plate ring (6) and a shoulder (8) on the middle inner surface of the shell (1).

5. The integrated shaft electric drive assembly structure according to claim 4, characterized in that: The conductive ring (5) is coaxially fixed on the pressure plate ring (6).

6. The integrated shaft electric drive assembly structure according to claim 5, characterized in that: The conductive ring (5) is located between the stator-rotor mechanism (3) and the speed reduction mechanism (4).

7. The integrated shaft electric drive assembly structure according to claim 6, characterized in that: The conductive ring (5) is close to the stator-rotor mechanism (3).

8. The integrated shaft electric drive assembly structure according to claim 7, characterized in that: The bearing comprises a first end bearing (9) and a second end bearing (10) which are coaxially connected to the two ends of the rotating shaft (2); the first end bearing (9) is coaxially connected to the motor shaft section (2.1), and the second end bearing (10) is coaxially connected to the reducer shaft section (2.2).

9. The integrated shaft electric drive assembly structure according to claim 8, characterized in that: The middle bearing (7) and the second end bearing (10) are used to support the rotating shaft (2), and the first end bearing (9) is used to guide the rotating shaft (2) to rotate.

10. A vehicle, characterized in that: It includes the integrated shaft electric drive assembly structure as described in any one of claims 1 to 9.

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