Shaft body structure and driving assembly

Abstract

The utility model discloses an axle body structure and drive assembly. The axle body structure includes motor shaft and input shaft. Input shaft is welded in motor shaft, and input shaft has gear cooperation part. The axle body structure divides motor shaft and input shaft and designs separately, so it can choose different material, forging technology and heat treatment technology shaping respectively to adapt to different working condition demand, simultaneously, adopts welding shaping between motor shaft and input shaft, can ensure the integrity of the axle body structure, omits a set of internal and external spline processing and bearing, and more has cost advantage.

Description

Technical Field

[0001] This utility model relates to the field of shaft technology, and in particular to a shaft structure and drive assembly. Background Technology

[0002] In an electric drive system, torque transmission is achieved through a spline connection between the motor shaft and the gearbox input shaft. However, in related technologies, the next generation of mainstream motor shaft designs integrates the input shaft of the reducer onto the motor shaft, achieving a unified design (e.g., ...). Figure 1 As shown in the image, this is referred to as an "integrated shaft." Based on traditional solutions, it omits a set of internal and external spline machining and bearings, resulting in a greater cost advantage. However, because the two components are combined into one, the shaft becomes longer and more complex, placing higher demands on machining processes and lightweight design.

[0003] Specifically, in traditional gear manufacturing processes, low-carbon alloy steel is often selected. A uniformly thick hardened layer is achieved on the gear surface through overall carburizing heat treatment to meet the gear's strength and wear resistance requirements. For integrated shafts where the input shaft of the reducer is attached to the motor shaft, the current conventional manufacturing process uses low-carbon alloy steel. The blank is forged, then normalized or tempered. After rough machining of the blank, it undergoes overall carburizing heat treatment, followed by subsequent finishing of the gear and other functional surfaces according to functional and dimensional requirements. The shortcomings of this process are: firstly, low material utilization. Due to the complex shape and structure of the product, the forging of the blank results in poor local shaping, requiring machining to remove excess material, thus increasing equipment processing costs and causing waste. Secondly, if... Figure 2 As shown, the lightweight design capability of the shaft is limited. Based on the following integrated shaft structure, the outer diameters on the left and right sides are small, while the diameter of the middle area is large. Usually, long blind holes are drilled inside the shaft to reduce weight. However, the inner diameter of the blind hole is limited by the outer dimensions and strength requirements, which restricts the size of the blind hole. The overall weight reduction capability is limited, and the drilling cost and material consumption are high, resulting in insufficient utilization. Utility Model Content

[0004] The purpose of this utility model is to provide a shaft structure and drive assembly. The shaft structure separates the motor shaft and the input shaft, so they can be formed by using different materials, forging processes and heat treatment processes to adapt to different working conditions. At the same time, the motor shaft and the input shaft are welded together, which can ensure the integrity of the shaft structure, and eliminate a set of internal and external spline machining and bearings, which is more cost-effective.

[0005] This utility model embodiment discloses a shaft structure, which includes:

[0006] Motor shaft;

[0007] An input shaft is welded to the motor shaft, and the input shaft has a gear engagement portion.

[0008] Furthermore, the material strength of the gear mating part is different from that of the motor shaft.

[0009] Furthermore, the material strength of the gear mating part is greater than the material strength of the motor shaft.

[0010] Furthermore, the motor shaft has a first weight-reducing hole extending in the axial direction, and the input shaft has a second weight-reducing hole extending in the axial direction, with the first weight-reducing hole and the second weight-reducing hole communicating with each other.

[0011] Furthermore, the input shaft includes a small diameter section and a large diameter section, the gear mating part is located on the small diameter section, and the shaft diameter of the small diameter section is smaller than the shaft diameter of the motor shaft. The second weight-reducing hole is a stepped hole, the large diameter end face of the stepped hole is located on the large diameter section, the small diameter end face of the stepped hole is located on the small diameter section, and the large diameter end face of the second weight-reducing hole is compatible with the first weight-reducing hole.

[0012] Furthermore, the gear mating part is made of alloy steel and undergoes carburizing or carbonitriding heat treatment.

[0013] Furthermore, the motor shaft includes a shaft body and a shaft end. The input shaft is welded to one end of the shaft body, and the shaft end is welded to the other end. The shaft end has a stepped structure for fixing bearings and / or for mounting sensors.

[0014] Furthermore, the material strength of the shaft body is greater than or equal to the material strength of the shaft end.

[0015] Furthermore, the motor shaft also includes a limiting sleeve, the shaft body is a cylinder, and the limiting sleeve is press-fitted between the shaft body and the input shaft.

[0016] Furthermore, the material strength of the shaft body is greater than or equal to the material strength of the limiting sleeve.

[0017] Furthermore, an axial step is provided on the input shaft, and the limiting sleeve abuts against the small-diameter end face and side wall of the axial step, with the outer surface of the limiting sleeve overlapping the large-diameter end face of the axial step.

[0018] Furthermore, the limiting step is provided with a tool relief groove and a chamfer.

[0019] Furthermore, the shaft body, the shaft end, and the limiting sleeve are all forged.

[0020] This utility model embodiment further discloses a drive component, which includes the above-described shaft structure.

[0021] The shaft structure and drive assembly provided by this utility model have at least the following beneficial effects, including but not limited to:

[0022] 1) This shaft structure features a separate design for the motor shaft and input shaft, allowing for the use of different materials, forging processes, and heat treatments to adapt to various operating conditions. Furthermore, the motor shaft and input shaft are welded together, ensuring the structural integrity of the shaft and eliminating the need for internal and external spline machining and bearings, resulting in a cost advantage. Additionally, this shaft structure allows for the selective use of high-strength gear components and low-strength motor shaft components, avoiding waste of high-cost materials.

[0023] 2) The second weight-reducing hole corresponding to the input shaft in this shaft structure is a stepped hole, and its large-diameter end face is compatible with the first shock-absorbing hole corresponding to the motor shaft. This structural design can improve the lightweight design capability of the shaft structure. Based on the commonly used integrated shaft structure, the outer diameter of the left and right sides is small and the diameter of the middle area is large. This structural arrangement makes the inner diameter of each hole less restricted by the outer dimensions, with strong overall weight-reducing capability, and can reduce drilling costs and material consumption.

[0024] 3) Due to the relatively complex structure of the shaft end, separating the shaft end from the shaft body makes the shaft body easier to process and improves its material utilization. At the same time, welding the shaft end and the shaft body together can also ensure the integration capability of the shaft structure. In addition, the material type of one or both of the shaft end and the shaft body can be selectively adjusted to further reduce the loss of high-cost materials.

[0025] 4) In this shaft structure, the shaft body is set as a cylinder, and a limiting sleeve is introduced and press-fitted onto the shaft body and the input shaft. This can further reduce the molding difficulty of the shaft body, and the limiting sleeve can play the role of axial limiting during the installation and operation of the rotor core, ensuring the functional integrity of the shaft structure. Attached Figure Description

[0026] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0027] Figure 1 This is a schematic diagram of the structure of an integrated shaft in related technologies;

[0028] Figure 2 This is a cross-sectional schematic diagram of an integral shaft in related technologies;

[0029] Figure 3 This is a schematic diagram of the shaft structure provided in Embodiment 1 of the present utility model;

[0030] Figure 4 This is a schematic diagram of the shaft structure provided in Embodiment 2 of this utility model;

[0031] Figure 5 This is a schematic diagram of the shaft structure provided in Embodiment 3 of this utility model;

[0032] Figure 6 A schematic diagram illustrating the fit between the limiting sleeve and the axial step provided in Embodiment 3 of this utility model;

[0033] Icon: 100-axis structure;

[0034] 10-Motor shaft; 101-First weight reduction hole; 102-Shaft body; 103-Shaft end; 104-Limiting sleeve;

[0035] 11-Input shaft; 111-Gear mating part; 112-Second weight reduction hole; 113-Small diameter section; 114-Large diameter section; 115-Axial step; 1151-Undrill groove. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Example 1

[0039] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the shaft structure 100 provided in Embodiment 1 of the present invention. The shaft structure 100 includes a motor shaft 10 and an input shaft 11. The input shaft 11 is welded to the motor shaft 10, and the input shaft 11 has a gear engagement portion 111.

[0040] It should be noted that the input shaft 11 in this embodiment can be the input shaft 11 inside the reducer, and the gear mating part 111 can be a gear structure for transmitting power through its own rotation. Depending on the specific implementation environment, the input shaft 11 here can also be other input shaft 11 structures, on which corresponding gear mating parts 111 are provided.

[0041] It should also be noted that, in this embodiment, the input shaft 11 may be made entirely of the same high-strength material as the gear mating part 111, or it may only be made of high-strength material in the gear mating part 111. This embodiment does not limit the material type or strength of the rest of the input shaft 11.

[0042] It is worth noting that the shaft structure 100 separates the motor shaft 10 and the input shaft 11, so they can be formed using different materials, forging processes and heat treatment processes to adapt to different working conditions. At the same time, the motor shaft 10 and the input shaft 11 are welded together, which can ensure the integrity of the shaft structure 100, and eliminate a set of internal and external spline machining and bearings, which is more cost-effective.

[0043] Optionally, the material strength of the gear mating part 111 is different from the material strength of the motor shaft 10.

[0044] Specifically, the shaft structure 100 may selectively employ a high-strength gear mating part 111 and a low-strength motor shaft 10, or may selectively employ a high-strength motor shaft 10 and a low-strength gear mating part 111, in order to avoid wasting high-cost consumables.

[0045] Typically, the material strength of the gear mating part 111 is greater than that of the motor shaft 10. Specifically, the input shaft 11 needs to transmit the electromagnetic force generated by the inner and outer rotors of the motor to the gearbox through the gear mating part 111. Therefore, the strength requirement of the gear mating part 111 is usually higher (compared to the ordinary motor shaft 10). Using a high-strength gear mating part 111 effectively meets the strength requirements, while using a low-strength motor shaft 10 saves on the waste of high-strength material. It is understandable that, generally speaking, the cost of the aforementioned high-strength material is higher than the cost of the low-strength material.

[0046] In some other special working conditions, the motor shaft 10 needs to bear higher loads. Therefore, a motor shaft 10 with high material strength and a gear mating part 111 with low material strength can be selected to meet the working conditions.

[0047] In this embodiment, the gear mating part 111 can be made of alloy steel and subjected to carburizing or carbonitriding heat treatment.

[0048] It is worth noting that the gear mating part 111 can be made of low-carbon alloy steel, depending on functional and strength requirements. The steel is supplied in the form of bars or discs, and specific grades can be, for example, 20CrMnTi, 20MnCr5, or 27MnCr. It undergoes heat treatment such as integral carburizing or carbonitriding. The machining process is as follows: blank forging, machining of the outer shape, precision machining of the welded area, gear hobbing, and overall heat treatment.

[0049] Please refer to this again. Figure 3 The motor shaft 10 has a first weight-reducing hole 101 extending in the axial direction, and the input shaft 11 has a second weight-reducing hole 112 extending in the axial direction. The first weight-reducing hole 101 and the second weight-reducing hole 112 are connected to each other.

[0050] It is worth noting that the axial direction here refers to the axial direction of the shaft structure 100, which can be referred to as... Figure 3 The markings in the diagram. By designing through-holes in the motor shaft 10 and input shaft 11, the overall mass of the shaft structure 100 can be reduced, thereby reducing the system's inertia, improving the energy efficiency of the drive components, and reducing energy consumption. At the same time, the design of the through-holes can optimize the stress distribution inside the shaft, reduce local stress concentration, improve the fatigue resistance of the shaft structure 100, and extend its service life.

[0051] Example 2

[0052] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the shaft structure 100 provided in Embodiment 2 of this utility model. First, it should be understood that the difference between Embodiment 2 and Embodiment 1 lies only in the structure of the motor shaft 10 and its corresponding first weight-reducing hole 101. For the remaining similar and identical parts, please refer to Embodiment 1, and they will not be repeated here.

[0053] Specifically, in the shaft structure 100 provided in Embodiment 2, the input shaft 11 may include a small diameter section 113 and a large diameter section 114. The gear mating part 111 is located on the small diameter section 113, and the shaft diameter of the small diameter section 113 is smaller than the shaft diameter of the motor shaft 10. The second weight-reducing hole 112 is a stepped hole. The large diameter end face of the stepped hole is located on the large diameter section 114, and the small diameter end face of the stepped hole is located on the small diameter section 113. The large diameter end face of the second weight-reducing hole 112 is adapted to the first weight-reducing hole 101.

[0054] It is worth noting that the second weight-reducing hole 112 corresponding to the input shaft 11 in the shaft structure 100 is a stepped hole, and its large-diameter end face is compatible with the first damping hole corresponding to the motor shaft 10. This structural design can improve the lightweight design capability of the shaft structure 100. Based on the commonly used integrated shaft structure, the outer diameters on the left and right sides are small (since the input shaft 11 needs to be matched with the gearbox, its size is usually smaller than that of the motor shaft 10), and the diameter of the middle area is large. This structural arrangement makes the inner diameter of each hole less restricted by the outer dimensions, has a strong overall weight-reducing capacity, and can reduce drilling costs and material consumption.

[0055] Please refer to this again. Figure 4 The motor shaft 10 may include a shaft body 102 and a shaft end 103. One end of the shaft body 102 is welded with an input shaft 11, and the other end is welded with a shaft end 103. The shaft end 103 has a stepped structure for fixing bearings and / or for mounting sensors.

[0056] It is worth noting that, since the structure of the shaft end 103 in the shaft structure 100 is relatively complex (it is used to fix the bearing and install the sensor), separating the shaft end 103 from the shaft body 102 makes the shaft body 102 easier to process and improves its material utilization. At the same time, welding the shaft end 103 and the shaft body 102 together can also ensure the integration capability of the shaft structure 100.

[0057] In this embodiment, the material strength of the shaft body 102 is greater than or equal to the material strength of the shaft end 103.

[0058] Understandably, the shaft body 102, as the core load-bearing component, needs to withstand the torque transmitted by the motor and external loads. Therefore, it must be made of high-strength materials to ensure sufficient fatigue resistance and durability. On the other hand, the shaft end 103 is usually used to install bearings, sensors, and other components. Its load-bearing requirements are lower, so it can be made of materials with lower strength but easier to process, in order to reduce manufacturing costs and processing difficulty.

[0059] In one embodiment of this invention, the main functions of the shaft end 103 are: fixing the bearing and installing the position angle sensor. Depending on the functional and strength requirements, medium-low carbon steel or alloy steel can be selected. The steel is supplied in bar stock or billet stock, with specific grades such as 45 steel, 50 steel, or 42CrMo4 alloy steel, etc., without heat treatment. The machining process is: blank forging, rough machining of the outer shape, and precision machining of the welded area.

[0060] In one embodiment of this invention, the main function of the shaft body 102 is to connect with the rotor core via interference fit or keyway, transmitting the torque generated by the stator and rotor electromagnetic transmission to the input shaft 11. Depending on functional and strength requirements, medium or high carbon steel is selected, and the steel is supplied in tubular form, such as 45 steel, 50 steel, or 60 steel, etc., without heat treatment. The machining process involves machining the outer shape and precision machining the dimensions of the welding area.

[0061] It is worth noting that the material types mentioned above are merely illustrative and do not constitute a limitation on specific material types. Similarly, the processing technology is also illustrative and does not constitute a limitation on specific processing technology. Specifically, in one embodiment, the shaft body 102 can be made of 45 steel, and the shaft end 103 is also made of 45 steel, meaning the material strength of the shaft body 102 is equal to the material strength of the shaft end 103. In another embodiment, the shaft body 102 can be made of 50 steel, and the shaft end 103 is made of 45 steel, meaning the material strength of the shaft body 102 is greater than the material strength of the shaft end 103.

[0062] Example 3

[0063] Please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the shaft structure 100 provided in Embodiment 3 of this utility model; Figure 6 This is a schematic diagram illustrating the fit between the limiting sleeve 104 and the axial step 115 provided in Embodiment 3 of this utility model. First, it should be understood that the only difference between Embodiment 3 and Embodiment 2 is the structure of the motor shaft 10. For the remaining similar or identical parts, please refer to Embodiment 2, and they will not be repeated here.

[0064] In this embodiment, the motor shaft 10 also includes a limiting sleeve 104. The shaft body 102 is a cylinder, and the limiting sleeve 104 is press-fitted between the shaft body 102 and the input shaft 11.

[0065] It is worth noting that in the shaft structure 100, the shaft body 102 is set as a cylinder, and a limiting sleeve 104 is introduced and pressed onto the shaft body 102 and the input shaft 11. This can further reduce the molding difficulty of the shaft body 102, and the limiting sleeve 104 can play the role of axial limiting during the installation and operation of the rotor core, ensuring the functional integrity of the shaft structure 100.

[0066] Optionally, the material strength of the shaft body 102 is greater than or equal to the material strength of the limiting sleeve 104.

[0067] Specifically, the function of the limiting sleeve 104 is mainly to limit the axial movement of the rotor core during installation and operation, so its material strength requirement is not high. The above-mentioned structural design can reasonably plan different material types for the motor shaft 10 to save material costs.

[0068] Specifically, the function of the limiting sleeve 104 is mainly to limit the axial movement of the rotor core during installation and operation. Depending on the functional and strength requirements, it can be made of medium-low carbon steel or alloy steel. The steel is supplied in bar stock or billet stock, such as 45 steel, 50 steel, or 42CrMo4 alloy steel, etc. No heat treatment is required. The processing technology is: blank forging and machining of the shape.

[0069] Please refer to this again. Figure 6 An axial step 115 is provided on the input shaft 11. The limiting sleeve 104 abuts against the small diameter end face and side wall of the axial step 115. The outer surface of the limiting sleeve 104 coincides with the large diameter end face of the axial step 115.

[0070] It is worth noting that the axial step 115 can achieve relative positioning of the limiting sleeve 104, ensuring the positional accuracy of the limiting sleeve 104 and improving its performance. As shown in the figure, the small-diameter end face of the axial step 115 refers to the area below the limiting sleeve 104, the side wall surface refers to the area to the left of the limiting sleeve 104, and the axial step 115 refers to the area communicating with the upper part of the limiting sleeve 104. This structural design further prevents the limiting sleeve 104 from shifting, thereby improving its positional accuracy.

[0071] Please refer to this again. Figure 6 The limiting step is provided with a tool relief groove 1151 and a chamfer to avoid stress concentration or assembly interference caused by local contact.

[0072] As mentioned above, in this embodiment, the shaft body 102, shaft end 103, and limiting sleeve 104 are all forged. Forging can bring the following benefits: 1) Improved material strength: Forging can improve the grain structure of metal, increase its strength and toughness, and give it better mechanical properties; 2) Improved surface quality: Pressure is generated on the metal surface during forging, which can eliminate surface defects and improve surface quality; 3) Material saving: Forging can usually reduce material waste, improve material utilization, and thus reduce production costs; 4) Increased production efficiency: Forging is a highly efficient processing method that can quickly produce a large number of parts, improving production efficiency.

[0073] During the assembly process of the shaft structure 100, the assembly sequence may include the following steps:

[0074] The shaft end 103 and the shaft body 102 are connected together by welding methods such as KE resistance welding or laser welding. The part after welding the sub-shaft end 103 and the shaft body 102 is then connected to the input shaft 11 by KE resistance welding or laser welding. At this point, ultrasonic testing is used to detect defects in the two weld areas. After passing the inspection, the limiting sleeve 104 is fitted together by heat fitting or interference fit, and positioned by the axial step 115 reserved on the right side of the input shaft 11 (see...). Figure 6 Furthermore, corresponding relief grooves 1151 and chamfers are made at the input shaft 11 and the limiting sleeve 104 to avoid local contact.

[0075] After the four sub-parts are welded and interference-fitted together, subsequent functional surface local induction heat treatment (selecting the areas requiring heat treatment according to function and strength) and final processing such as grinding can be carried out.

[0076] Example 4

[0077] Embodiment 4 of this utility model further discloses a drive assembly, which includes the aforementioned shaft structure 100 and possesses all its beneficial effects. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0078] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of 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 of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0079] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations 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. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can 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 shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0080] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0081] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0082] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0083] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of the utility model, and such modifications will be within the spirit and scope of the utility model.

[0084] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A shaft body structure characterized by comprising: include: Motor shaft; An input shaft is welded to the motor shaft, and the input shaft has a gear engagement portion; The material strength of the gear mating part is different from the material strength of the motor shaft; The motor shaft includes a shaft body and shaft ends; The motor shaft also includes a limiting sleeve. The shaft body is cylindrical, and the limiting sleeve is press-fitted between the shaft body and the input shaft.

2. The shaft structure according to claim 1, characterized in that, The material strength of the gear mating part is greater than that of the motor shaft.

3. The shaft structure according to claim 1, characterized in that, The motor shaft has a first weight-reducing hole extending in the axial direction, and the input shaft has a second weight-reducing hole extending in the axial direction. The first weight-reducing hole and the second weight-reducing hole are in communication with each other.

4. The shaft structure according to claim 3, characterized in that, The input shaft includes a small diameter section and a large diameter section. The gear mating part is located on the small diameter section, and the shaft diameter of the small diameter section is smaller than the shaft diameter of the motor shaft. The second weight-reducing hole is a stepped hole. The large diameter end face of the stepped hole is located on the large diameter section, and the small diameter end face of the stepped hole is located on the small diameter section. The large diameter end face of the second weight-reducing hole is compatible with the first weight-reducing hole.

5. The shaft structure according to claim 1, characterized in that, The gear mating part is made of alloy steel and is subjected to carburizing or carbonitriding heat treatment.

6. The shaft structure according to claim 1, characterized in that, The input shaft is welded to one end of the shaft body, and the shaft end is welded to the other end. The shaft end has a stepped structure for fixing bearings and / or for mounting sensors.

7. The shaft structure according to claim 6, characterized in that, The material strength of the shaft body is greater than or equal to the material strength of the shaft end.

8. The shaft structure according to claim 1, characterized in that, The material strength of the shaft body is greater than or equal to the material strength of the limiting sleeve.

9. The shaft structure according to claim 1, characterized in that, An axial step is provided on the input shaft, and the limiting sleeve abuts against the small diameter end face and side wall of the axial step. The outer surface of the limiting sleeve coincides with the large diameter end face of the axial step.

10. The shaft structure according to claim 9, characterized in that, The limiting step is provided with a tool relief groove and a chamfer.

11. The shaft structure according to claim 6, characterized in that, The shaft body, the shaft end, and the limiting sleeve are all forged.

12. A driving component, characterized in that, Includes the shaft structure as described in any one of claims 1-11.

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