Hollow shaft, driving motor and driving assembly

Abstract

The embodiment of the utility model discloses a hollow shaft, a driving motor and a driving assembly, and relates to the technical field of motors. The hollow shaft comprises a shaft body, a first mounting part and a second mounting part, the shaft body is of a hollow cylinder structure with a first inner cavity, and the first installation part and the second installation part are welded to the two ends of the shaft body respectively. According to the hollow shaft, through the sectional design and the mutual welding mode, shaft body materials can be better utilized, material waste is reduced, sectional machining forming can be achieved, the production takt is accelerated, and economical efficiency is improved. Meanwhile, the shaft body in the hollow shaft is of the hollow cylinder structure with the first inner cavity, the hollow shaft is simple in structure, compared with the technical scheme of gun drilling or rotary swaging, the interior of the hollow shaft is easier to machine, unnecessary structures can be reduced, and therefore the characteristics of reducing the mass and achieving light weight are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a hollow shaft, a driving motor and a driving assembly. Background Art

[0002] At present, the mainstream new energy vehicle drive motors on the market are generally water-cooled motors. With the in-depth development of the drive motor business, 800V motors are gradually coming into the public eye. The higher the voltage requirements, the higher the cooling requirements for the motors. Currently, oil-cooled motor projects are gradually becoming the development trend of new energy motors, and the cooling oil circuits of the stators and rotors need to be realized through hollow shafts. Therefore, the design and development of hollow shafts are of great significance to the market competitiveness of new energy vehicles.

[0003] The related art process for forming the hollow shaft blank of the drive motor mainly includes the following two methods: 1) Gun drilling after bar machining, such as Figure 1 2) After the rod is machined and drilled, it is forged to close the hole, such as Figure 2 Therefore, the disadvantage of the hollow shaft in the related art is that the mass is large, which not only increases the mass of the motor, but also reduces the motor efficiency, and it is also not in line with the development direction of lightweight new energy electric vehicles. At the same time, it also has the defects of complex processing and low material utilization.

[0004] Therefore, there is an urgent need for a hollow shaft that can make better use of the shaft body material, reduce material waste, and improve economic efficiency. Summary of the invention

[0005] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a hollow shaft, a drive motor and a drive assembly. The hollow shaft is designed in sections and welded to each other, so that the shaft body material can be better utilized and material waste can be reduced. It can be processed and formed in sections to speed up the production cycle and improve economy.

[0006] An embodiment of the utility model discloses a hollow shaft, which includes a shaft body, a first mounting portion and a second mounting portion; the shaft body is a hollow cylindrical structure with a first inner cavity, and the first mounting portion and the second mounting portion are respectively welded to the two ends of the shaft body, wherein the material strength of the first mounting portion, the material strength of the second mounting portion and the material strength of the shaft body are not completely the same.

[0007] The material strengths of the shaft body, the first mounting portion and the second mounting portion of the hollow shaft are not completely the same, and different strength materials can be selected according to the load distribution of the hollow shaft during operation, thereby reducing the cost of raw materials.

[0008] Furthermore, the first mounting portion and / or the second mounting portion has a second inner cavity interconnected with the first inner cavity.

[0009] Furthermore, the second inner cavity is a stepped groove, and the large end hole of the second inner cavity is close to the first inner cavity.

[0010] Furthermore, the first mounting portion includes an external spline, a bearing stopper and a first mounting body which are sequentially arranged in steps. The first mounting body is a large diameter end, and the first mounting body is welded to the shaft body.

[0011] Furthermore, the material strength of the second mounting portion and the material strength of the shaft body are both smaller than the material strength of the first mounting portion.

[0012] Furthermore, the axial diameter of the first mounting body is the same as the axial diameter of the shaft body.

[0013] Furthermore, the first mounting portion and the second mounting portion are both forged.

[0014] The embodiment of the utility model further discloses a driving motor, comprising the above-mentioned hollow shaft.

[0015] The embodiment of the utility model further discloses a driving assembly, comprising the above-mentioned hollow shaft, and / or a driving motor.

[0016] The hollow shaft provided by the utility model has the following beneficial effects, including but not limited to:

[0017] 1) The hollow shaft is welded by two welds in three sections, the first mounting parts and the second mounting parts at both ends are forged, and the middle shaft body is made of pipe material, which can be processed and formed in sections, thereby improving production efficiency and reducing processing costs;

[0018] 2) The hollow shaft body is a hollow cylindrical structure with a first inner cavity, which has a simple structure. Compared with the technical solutions of gun drilling or rotary forging, the interior is easier to process, which is conducive to reducing the existence of unnecessary structures, thereby reducing the mass;

[0019] 3) The various segments of the hollow shaft can be made of different strength materials for the first mounting portion, the second mounting portion and the shaft body according to the load distribution of the hollow shaft during operation, thereby reducing the cost of raw materials;

[0020] 4) The processing technology of segmented processing and then welding of the hollow shaft can form a complex inner cavity structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0022] Figure 1 A schematic diagram of a hollow shaft with an inner cavity gun drilled to form a related art;

[0023] Figure 2A schematic diagram of a hollow shaft with an inner cavity and a rotating end formed in the related art;

[0024] Figure 3 A schematic diagram of the structure of a hollow shaft provided in an embodiment of the utility model;

[0025] Figure 4 A cross-sectional view of a hollow shaft provided in an embodiment of the utility model.

[0026] Icon: 100 - hollow shaft; 11 - shaft body; 111 - first inner cavity; 12 - first mounting portion; 121 - external spline; 122 - bearing stop; 123 - first mounting body; 13 - second mounting portion; 14 - second inner cavity. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] Please refer to Figure 3 and Figure 4 The embodiment of the utility model provides a hollow shaft 100, which includes a shaft body 11, a first mounting portion 12 and a second mounting portion 13; the shaft body 11 is a hollow cylindrical structure having a first inner cavity 111, and the first mounting portion 12 and the second mounting portion 13 are respectively welded to the two ends of the shaft body 11. The material strength of the first mounting portion 12 and the material strength of the second mounting portion 13 are not completely the same as the material strength of the shaft body 11.

[0030] It is worth noting that the hollow shaft 100 is designed in sections and welded to each other, so that the shaft body material can be better utilized and material waste can be reduced. It can be processed and formed in sections, which speeds up the production cycle and improves economic efficiency. At the same time, the shaft body 11 of the hollow shaft 100 is a hollow cylindrical structure with a first inner cavity 111. Its structure is simple. Compared with the technical solutions of gun drilling or rotary forging, its interior is easier to process, which is conducive to reducing the existence of unnecessary structures, thereby reducing mass and achieving lightweight characteristics.

[0031] It is also worth noting that the material strength of the first mounting portion 12, the material strength of the second mounting portion 13 and the material strength of the shaft body 11 are not completely the same, which means that the material strengths of the three are different or completely different. This setting method can optimize the strength distribution. By using materials of different strengths in different parts, it can be optimized according to the load and stress level borne by each part. At the same time, the selection of materials of different strengths can reduce material costs. It can use materials of different strengths to achieve a lightweight design of the shaft and reduce unnecessary weight while ensuring the overall strength of the shaft.

[0032] In this embodiment, the first mounting portion 12 and / or the second mounting portion 13 has a second inner cavity 14 that is interconnected with the first inner cavity 111. It is understandable that the provision of the second inner cavity 14 can realize the cooling oil circuit of the motor stator and rotor, thereby improving the performance and applicability of the hollow shaft 100.

[0033] In this embodiment, the second inner cavity 14 is a stepped groove, and the large end hole of the second inner cavity 14 is close to the first inner cavity 111 .

[0034] It is worth noting that by designing the second inner cavity 14 as a stepped groove, the overall structural strength of the hollow shaft 100 can be increased, and its ability to resist bending and torsion can be improved. At the same time, the design of the stepped groove can make the processing of the second inner cavity 14 simpler and easier, reduce manufacturing costs, and improve production efficiency.

[0035] It is also worth mentioning that the processing technology of segmented processing and then welding of the hollow shaft 100 can form a complex inner cavity structure.

[0036] In this embodiment, the material strength of the first mounting portion 12 , the material strength of the second mounting portion 13 and the material strength of the shaft body 11 are not completely the same.

[0037] In this embodiment, the first mounting portion 12 includes an external spline 121 , a bearing stopper 122 and a first mounting body 123 which are sequentially arranged in steps. The first mounting body 123 is a large diameter end, and the first mounting body 123 is welded to the shaft body 11 .

[0038] It is worth noting that by using the stepped external spline 121 and the bearing stop 122 on the first mounting portion 12, a more reliable connection can be provided, the stability between the shaft and other components (such as bearings) can be enhanced, and the vibration and displacement of the shaft during operation can be reduced, thereby improving the operational stability and reliability of the equipment. At the same time, the stepped external spline 121 and the bearing stop 122 can increase the connection area, increase the contact area between the shaft and other components, thereby increasing the load-bearing capacity, helping the shaft to remain stable when subjected to high loads, and reducing the risk of failure due to insufficient load-bearing capacity.

[0039] In this embodiment, the material strength of the second mounting portion 13 and the material strength of the shaft body 11 are both smaller than the material strength of the first mounting portion 12 .

[0040] It is understandable that the first mounting portion 12 in this embodiment will bear more loads, so its material strength requirement is higher. The material strength of the remaining positions (the shaft body 11 and the second mounting portion 13) is lower than that of the first mounting portion 12. Selecting a material with a lower strength than that of the first mounting portion 12 can generally save costs. While ensuring the quality of the hollow shaft 100, it also improves the economic efficiency.

[0041] In this embodiment, the shaft diameter of the first installation body 123 is the same as the shaft diameter of the shaft body 11 .

[0042] Optionally, the first mounting portion 12 and the second mounting portion 13 are both forged.

[0043] Specifically, the forging method of the first mounting part 12 and the second mounting part 13 can be hot forging, extrusion forging, free forging, cold heading, etc. Forging can bring the following benefits: 1) Improve material strength: Forging can improve the grain structure of the metal, improve its strength and toughness, and make it have better mechanical properties; 2) Improve surface quality: Pressure will be generated on the metal surface during the forging process, which can eliminate surface defects and improve surface quality. 3) Save materials: Forging can usually reduce material waste and improve material utilization, thereby reducing production costs. 4) Improve production efficiency: Forging is an efficient processing method that can quickly produce a large number of parts and improve production efficiency.

[0044] This embodiment also provides a driving motor, including the above-mentioned hollow shaft 100, having all its beneficial effects.

[0045] This embodiment also provides a drive assembly, including the above-mentioned hollow shaft 100 and / or the above-mentioned drive motor, having all the beneficial effects of the hollow shaft 100.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

[0047] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more specific details or by other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0048] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described herein and shown may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0049] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0050] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0051] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0052] The above description of the illustrated embodiments of the present invention (including the contents in the abstract of the specification) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and understood by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments of the present invention, and these modifications will be within the spirit and scope of the present invention.

[0053] Systems and methods have been generally described herein as details that are helpful for understanding the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more specific details, or practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of the embodiments of the present invention.

Claims

1. A hollow shaft, characterized in that: It includes a shaft body, a first mounting portion and a second mounting portion; The shaft body is a hollow cylindrical structure with a first inner cavity, and the first mounting portion and the second mounting portion are respectively welded to two ends of the shaft body; wherein the material strength of the first mounting portion, the material strength of the second mounting portion and the material strength of the shaft body are not completely the same.

2. The hollow shaft according to claim 1, characterized in that The first mounting portion and / or the second mounting portion has a second inner cavity interconnected with the first inner cavity.

3. The hollow shaft according to claim 2, characterized in that The second inner cavity is a stepped groove, and the large end hole of the second inner cavity is close to the first inner cavity.

4. The hollow shaft according to claim 1, characterized in that The first mounting portion includes an external spline, a bearing stopper and a first mounting body which are sequentially arranged in steps. The first mounting body is a large diameter end, and the first mounting body is welded to the shaft body.

5. The hollow shaft according to claim 4, characterized in that The material strength of the second mounting portion and the material strength of the shaft body are both smaller than the material strength of the first mounting portion.

6. The hollow shaft according to claim 4, characterized in that The shaft diameter of the first mounting body is the same as the shaft diameter of the shaft body.

7. The hollow shaft according to any one of claims 1 to 6, characterized in that: The first mounting portion and the second mounting portion are both forged.

8. A driving motor, characterized in that: Comprising the hollow shaft as described in any one of claims 1-7.

9. A drive assembly, characterized in that: It comprises the hollow shaft as described in any one of claims 1 to 7, and / or the drive motor as described in claim 8.

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