Traction device for built-in bogie of permanent magnet direct drive axle box

Abstract

The traction device comprises an upper traction device body, the upper traction device body comprises an upper traction body and a center traction pin, the upper traction body is connected with a vehicle body chassis, and the upper portion of the center traction pin is installed on the upper traction body in an interference pressing mode; the lower traction device is in interference fit with the upper traction device, the lower traction device comprises a traction pin seat, a traction spherical hinge, an upper cover, a wedge-shaped pressing block and a traction pull rod, the central traction pin is pressed in the traction spherical hinge in an interference manner, the traction spherical hinge is pressed in the traction pin seat in an interference manner, the traction pull rod is mounted on the traction pin seat, and a wedge-shaped groove and the wedge-shaped pressing block are arranged at the lower part of the central traction pin. The traction device can meet the function requirement and the space requirement of the permanent magnet direct drive axle box built-in type bogie, has the advantages of being high in strength, light in weight, small in overall dimension and high in integration level, is more compact and reasonable in overall arrangement and smaller in installation space requirement, and saves the labor cost, the material cost and the like for installing a safety steel cable.

Description

Technical Field

[0001] The present invention relates to the technical field of traction devices, and in particular to a traction device for a bogie with a permanent magnet direct-driven axle box built in. Background Art

[0002] The traction device is an important part of the secondary suspension of urban rail transit vehicles, generally including the upper traction body, traction pin, traction pin seat, center ball joint, upper cover and traction rod. The traction device is generally used for the flexible connection between the bogie and the car body, which can alleviate the vibration between the bogie and the car body to a certain extent; in addition to bearing the vertical weight of the car body, the traction device is also responsible for transmitting the traction and braking force generated by the bogie to the car body, and when necessary, it will also transmit the lateral force and torque between the bogie and the car body.

[0003] During the development of the permanent magnet direct drive axle box built-in bogie, in order to enhance the bogie's ability to pass curves and achieve lightweight design, the solution of direct drive by permanent magnet motor and the solution of built-in axle box were adopted, thereby reducing the bogie wheelbase and the lateral span of the side beam, making the bogie smaller than the conventional bogie, and the space available for equipment layout is also very tight. Conventional traction devices cannot meet the existing installation space requirements.

[0004] For example, a Chinese patent with application number 201120079027.6 and application date March 23, 2011 discloses a center pin longitudinal traction device for urban rail vehicles, which specifically discloses a traction seat, a frame, a traction rod assembly, a lateral shock absorber assembly, a lifting seat, and a lateral stop device. The traction seat is provided with a center pin guide cylinder, a traction rod mounting seat, a lifting mounting seat and a lateral shock absorber mounting seat. The lateral stop device is composed of a lateral stop seat and a lateral stop arranged on the lateral stop seat. The frame is additionally provided with a shaking head stop device. The traction rod of the traction rod assembly is arc-shaped, and traction rubber joints are provided at both ends.

[0005] However, the patented center pin longitudinal traction device has a large outline dimension and requires a large installation space. It is generally suitable for bogies with larger side beam lateral span and wheelbase. It cannot meet the application requirements of bogies with built-in permanent magnet direct-drive axle boxes.

[0006] In view of this, it is of great significance to develop a lightweight traction device that can integrate multiple secondary suspension device mounting interfaces. Summary of the invention

[0007] The main purpose of the present invention is to provide a traction device for a bogie with a permanent magnet direct-driven axle box built-in, which can meet the functional requirements and space requirements of the bogie with a permanent magnet direct-driven axle box built-in, and has the advantages of high strength, light weight, small outline size and high integration. The overall layout is more compact and reasonable, and the installation space requirement is smaller, saving the labor, material and other costs of installing safety cables.

[0008] According to one aspect of the present invention, a traction device for a bogie with a permanent magnet direct-driven axle box built-in is provided, comprising: An upper traction device, the upper traction device comprises an upper traction body and a central traction pin, the upper traction body is fixedly connected to the vehicle body chassis through a fastener, and the upper part of the central traction pin is interference-pressed on the upper traction body; and The lower traction device is connected with the upper traction device through the interference fit of the center traction pin. The lower traction device includes a traction pin seat, a traction ball joint, an upper cover, a wedge-shaped pressure block and a traction rod. The center traction pin is interference-pressed in the traction ball joint, the traction ball joint is interference-pressed on the traction pin seat and fixed by the upper cover, the traction rod is installed on the traction pin seat through fasteners and is rigidly connected to the frame, and a wedge-shaped groove is provided at the lower part of the center traction pin for accommodating the wedge-shaped pressure block.

[0009] According to one embodiment of the present invention, the number of traction rods is two, and the two traction rods are symmetrically arranged on both sides of the traction pin seat in a Z shape.

[0010] According to one embodiment of the present invention, the traction device further comprises a pressure plate, and the pressure plate is arranged below the traction pin seat.

[0011] According to one embodiment of the present invention, a lateral stop seat, a vertical stop seat and a lateral oil pressure damper seat are also provided on the traction pin seat.

[0012] According to one embodiment of the present invention, the transverse oil shock absorber seat extends longitudinally on the longitudinal center line of the traction device, the vertical stop seat is arranged on the upper surface of the cantilever extending laterally from the traction pin seat, and the transverse stop seat is arranged on the side surface of the end of the traction device.

[0013] According to one embodiment of the present invention, the traction pin seat is a Japanese-shaped box structure with a transversely extending cantilever.

[0014] According to an embodiment of the present invention, the lateral oil pressure shock absorber seat is U-shaped, with the opening direction facing the outside of the traction device.

[0015] According to one embodiment of the present invention, a mounting hole is provided in the middle of the traction pin seat, and the traction ball joint is press-fitted to the traction pin seat through the mounting hole.

[0016] According to an embodiment of the present invention, arc-shaped depressions are formed on two opposite lateral sides of the upper traction body.

[0017] According to one embodiment of the present invention, the fastener used to connect the traction pin seat and the traction rod is a bolt, and the mounting interface of the bolt is a through hole.

[0018] In a traction device for a permanent magnet direct-driven axle box built-in bogie according to an embodiment of the present invention, the functional requirements and space requirements of the permanent magnet direct-driven axle box built-in bogie can be met, and it has the advantages of high strength, light weight, small outline size and high integration. The overall layout is more compact and reasonable, and the installation space requirement is smaller, saving the labor, material and other costs of installing safety cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a traction device for a permanent magnet direct-driven axle box built-in bogie according to an exemplary embodiment of the present invention is shown; Figure 2 A cross-sectional view of a traction device for a permanent magnet direct-driven axle box built-in bogie according to an exemplary embodiment of the present invention is shown; Figure 3 A schematic diagram showing a traction device for a permanent magnet direct-driven axle box built-in bogie and related secondary suspension components according to an exemplary embodiment of the present invention; Figure 4 A schematic diagram of an upper traction body of a traction device for a bogie with a built-in permanent magnet direct-driven axle box according to an exemplary embodiment of the present invention is shown; Figure 5 A schematic diagram of a traction pin seat of a traction device for a permanent magnet direct-driven axle box built-in bogie according to an exemplary embodiment of the present invention is shown.

[0021] In the figure: 1. Upper traction body; 2. Center traction pin; 3. Traction pin seat; 4. Traction ball joint; 5. Upper cover; 6. Wedge-shaped pressure block; 7. Traction rod; 8. Transverse oil pressure shock absorber; 9. Transverse stop; 10. Vertical stop; 11. Pressure plate; 12. Transverse stop seat; 13. Vertical stop seat; 14. Transverse oil pressure shock absorber seat; 15. Traction rod seat. DETAILED DESCRIPTION

[0022] The detailed description of the following embodiments is used to exemplify the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0023] The present invention provides these embodiments to make this disclosure thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0024] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0025] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0026] All terms used in the present invention have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0027] Technologies, methods, and apparatus known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and apparatus should be considered part of the specification.

[0028] Existing patent solutions are all for conventional locomotive bogies and urban rail bogies. The traction device structure is relatively fixed and simple, and the outline dimensions are large, requiring a larger space for installation. It is not suitable for the narrow second-system lateral installation space of the permanent magnet direct-drive axle box built-in bogie.

[0029] like Figure 1 and 2As shown in the figure, the present invention provides a traction device for a permanent magnet direct drive axle box built-in bogie, which includes: an upper traction device, the upper traction device includes an upper traction body 1 and a central traction pin 2, the upper traction body 1 is fixedly connected to the vehicle body underframe through fasteners, and the upper part of the central traction pin 2 is press-fitted into the upper traction body 1 with interference; and a lower traction device, the lower traction device is connected to the upper traction device through interference fit of the central traction pin 2, the lower traction device includes a traction pin seat 3, a traction ball joint 4, an upper cover 5, a wedge-shaped pressing block 6 and a traction tie rod 7, the central traction pin 2 is press-fitted into the traction ball joint 4 with interference, the traction ball joint 4 is press-fitted onto the traction pin seat 3 and fixed by the upper cover 5, the traction tie rod 7 is installed on the traction pin seat 3 through fasteners and is rigidly connected to the bogie frame, a wedge-shaped groove is provided at the lower part of the central traction pin 2 for accommodating the wedge-shaped pressing block 6, and the wedge-shaped pressing block 6 is used for vertical and torsional limiting, so as to realize the function of transmitting the transverse, longitudinal and vertical loads between the bogie and the vehicle body.

[0030] The transverse, longitudinal and vertical forces generated by the bogie are transmitted to the traction pin seat 3 through the traction tie rod 7, and then transmitted to the vehicle body through the traction ball joint 4, the central traction pin and the upper traction body 1.

[0031] The central traction pin is in interference fit with both the upper traction body 1 and the traction ball joint 4 to prevent the central traction pin from rotating and moving vertically relative to the traction ball joint 4 during use.

[0032] In the traction device for a permanent magnet direct drive axle box built-in bogie according to an embodiment of the present invention, the functional requirements and space requirements of the permanent magnet direct drive axle box built-in bogie can be met, and it has the advantages of high strength, light weight, small contour size and high integration, the overall layout is more compact and reasonable, the requirement for the installation space is smaller, and the costs of labor, materials, etc. for installing safety cables are saved.

[0033] In addition to ensuring the basic functions of the traction device, this application also has the functions of overall lifting of the secondary suspension and limiting the overcharging of the air spring. The upper traction body 1 is designed with targeted narrowing to meet the smaller installation space provided by the transverse span of the secondary air spring; the traction pin seat 3 of the lower traction device adopts a horizontally extended double-arm "day"-shaped box structure, integrating a horizontal hydraulic shock absorber 8, a horizontal stop 9 and a vertical stop 10, and can be installed in the limited horizontal space provided by the permanent magnet direct drive bogie.

[0034] In some specific embodiments, the number of the traction tie rods 7 is 2, and the 2 traction tie rods 7 are symmetrically arranged in a Z shape on both sides of the traction pin seat 3. The Z-shaped structure makes the traction force and braking force transmitted by the traction device just parallel to the 4 vertical faces of the box-shaped structure, and this force condition is most beneficial to the stability of the box-shaped structure. When the traction tie rod 7 is bent and deformed, a restoring force will be generated, and this force can be used to clamp the side swing of the vehicle body. The traction tie rod 7 is arranged on the traction tie rod seat 15.

[0035] On the basis of the above embodiment, the traction device further includes a pressure plate 11, which is arranged below the traction pin seat 3. When the traction device needs to withstand a large vertical force, the pressure plate 11 can play a role in dispersing the applied force. Through its large contact area and solid structure, the pressure plate 11 can evenly disperse the traction force to various components, thereby reducing the risk of local damage or deformation. This dispersion effect helps to extend the service life of the traction device and improve its durability.

[0036] like Figure 3 As shown, in some specific embodiments, a lateral stop seat 12, a vertical stop seat 13 and a lateral oil shock absorber seat 14 are also provided on the traction pin seat 3, which are used to support the lateral stop 9, the vertical stop 10 and the lateral oil shock absorber 8 respectively.

[0037] In some specific embodiments, the transverse oil shock absorber seat 14 extends longitudinally on the longitudinal center line of the traction device, the vertical stop seat 13 is arranged on the upper surface of the cantilever extending laterally from the traction pin seat 3, and the transverse stop seat 12 is arranged on the side surface of the end of the traction device.

[0038] The cantilever end of the lower traction device is integrated with a vertical stopper 10, which can still limit the overcharging of the air spring and enable the traction device to have the function of overall lifting when the bogie is not provided with a safety steel cable.

[0039] The lower traction device integrates a longitudinally extending transverse oil shock absorber seat 14, and the mounting interface positions are all located on the longitudinal center line of the traction device. This arrangement greatly reduces the overall transverse profile size of the traction device, and two transverse oil shock absorbers 8 and a traction device can be arranged in a narrow transverse space.

[0040] The cantilever end of the lower traction device is integrated with a transverse stopper 9, and the installed transverse stopper 9 is located near the side beam of the frame, which greatly simplifies the cantilever structure of the impact seat of the transverse stopper 9 located on the side beam, reduces the processing difficulty of the impact seat, and enhances the structural stability of the impact seat.

[0041] On the basis of the above embodiments, the traction pin seat 3 is a Japanese-shaped box structure with a transversely extending cantilever.

[0042] In some specific embodiments, the transverse oil shock absorber seat 14 is U-shaped, with the opening direction facing the outside of the traction device.

[0043] On the basis of the above embodiment, a mounting hole is provided in the middle of the traction pin seat 3, and the traction ball joint 4 is press-fitted to the traction pin seat 3 through the mounting hole. Specifically, the mounting hole is cylindrical.

[0044] like Figure 4As shown, in some specific embodiments, arc-shaped depressions are formed on the opposite lateral sides of the upper traction body 1, that is, the outer contour is an arc that is wider at the top and narrower at the bottom. The upper traction body 1 is designed with targeted narrowing and lightweighting, and at the same time, the installation interfaces of the lateral hydraulic shock absorber 8, the lateral stop 9, and the vertical stop 10 are arranged on the lower traction device, which can further reduce the contour size of the upper traction body 1, enabling the upper traction body 1 to be placed within the limited lateral span of the air spring.

[0045] In order to adapt to the relatively small lateral span of the secondary air spring of the permanent magnet direct drive axle box built-in bogie, the upper traction body 1 is designed with specific narrowing. At the same time, considering the dynamic displacement of the air spring, the upper traction body 1 is also designed with a special arc-shaped contour. In order to further reduce the lateral contour size of the upper traction body 1, the lateral stop 9 and the lateral hydraulic shock absorber 8, which are generally arranged on the upper traction body 1, are arranged on the traction pin seat 3 of the lower traction body. When the bogie and the car body have relative displacement, this upper traction body 1 with a smaller outer shape avoids interference with the air spring. The upper traction body 1 has a compact structure and small installation space requirements, and is a relatively perfect solution for the upper traction body 1 of the permanent magnet direct drive axle box built-in bogie.

[0046] As Figure 5 shown, on the basis of the above embodiments, the fastener for connecting the traction pin seat and the traction rod is a bolt, and the installation interface of the bolt is a through hole. Both ends of the traction rod 7 are fastened by bolts and nuts, and the bolt installation interface of the traction pin seat 3 is a through hole, thereby reducing the processing risk of thread tapping for the blind hole of the traditional traction pin seat 3 and the rejection rate of the traction pin seat 3.

[0047] The traction pin seat 3 is a horizontally extended cantilever "day"-shaped box structure, integrating a traction rod seat 15, a lateral hydraulic shock absorber seat 14, a lateral stop seat 12, and a vertical stop seat 13. The cylindrical installation hole for placing the traction ball joint 4 naturally serves as the stiffener of the entire box structure, dividing the traction pin seat 3 into two cavity areas for accommodating the rubber joints of the traction rod 7. The traction force and braking force transmitted by the traction device are just parallel to the four vertical faces of the box structure, and this force condition is most beneficial to the stability of the box structure. The traction pin seat 3 has the characteristics of a compact structure, light weight, high strength, and good impact resistance. The lateral hydraulic shock absorber 8 extends longitudinally on the longitudinal center line of the traction device. In this layout scheme, the overall lateral contour size is only the length of two laterally symmetrically arranged lateral hydraulic shock absorbers 8, which is significantly better than the ordinary scheme with an overall lateral contour size of the length of two lateral hydraulic shock absorbers 8 plus a traction device.

[0048] The layout of the lateral hydraulic damper 8 of this application can not only provide the secondary lateral damping required for vehicle operation, but also make the overall structure more compact. The lateral stop 9 is located on the side vertical surface of the end of the horizontally extending cantilever, making the lateral stop 9 close to the side beam of the frame. The impact seat on the side beam does not need to extend a long cantilever, which not only simplifies the impact seat and the side beam structure on the side beam, but also makes the impact seat more durable.

[0049] The drawbar seat 3 is also provided with a vertical stop 10. The vertical stop 10 and the adjustment shim are installed on the upper plane of the horizontally extending cantilever of the drawbar seat 3. It can enable the secondary suspension of the bogie to still have the overall lifting function without setting a safety cable, saving the space for installing the safety cable; at the same time, the vertical stop 10 also has the function of restricting the secondary vertical displacement and overcharging of the air spring. The drawbar seat 3 is light in weight and high in structural strength. At the same time, it also integrates the installation interfaces of various secondary suspension components. Under the premise of meeting the functional requirements, the overall layout is very compact, which is a relatively perfect structural solution for the drawbar seat 3.

[0050] After the implementation of the present invention, it has at least the following beneficial effects: (1) Considering the relatively small lateral span and dynamic contour of the air spring of the permanent magnet direct drive axle box built-in bogie, the upper traction body is specifically laterally narrowed, so that the upper traction body can be installed and used under the limited lateral span of the air spring; (2) The drawbar seat of the lower traction device adopts a double-arm horizontally extending "day" - shaped box structure, and is light - weighted designed while ensuring strength, integrating the lateral hydraulic damper seat, the lateral stop seat, and the vertical stop seat; (3) The U - shaped lateral hydraulic damper seat extends longitudinally on the longitudinal center line of the drawbar seat, which can make the layout of the lateral hydraulic damper more compact, the overall lateral contour of the traction device and the lateral hydraulic damper smaller, and the requirement for the installation space smaller; (4) The lateral stop seat is arranged on the side vertical surface of the end of the horizontally extending cantilever of the drawbar seat, extending the installation position of the lateral stop to near the side beam impact seat, simplifying the side beam impact seat structure, reducing the processing difficulty and strengthening the structural stability at the same time.

[0051] (5) The vertical stop seat is arranged on the upper plane of the end of the horizontally extending cantilever of the drawbar seat. The setting of the vertical stop can not only restrict the secondary vertical movement but also limit the overcharging of the air spring. Without setting a safety cable, the traction device has the overall lifting function, and the bogie does not need to set a safety cable, contributing more installation space for other equipment on the bogie and saving the labor, materials and other costs for installing the safety cable.

[0052] The above are exemplary embodiments disclosed in the present invention. The order disclosed in the above embodiments of the present invention is for description only and does not represent the advantages and disadvantages of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope disclosed in the embodiments of the present invention (including the claims) is limited to these examples. Various changes and modifications may be made without departing from the scope defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0053] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A traction device for a bogie with a permanent magnet direct drive axle box built in, characterized in that: include: An upper traction device, the upper traction device comprising an upper traction body and a central traction pin, the upper traction body being fixedly connected to the vehicle body underframe via a fastener, and the upper portion of the central traction pin being interference-pressed on the upper traction body; and A lower traction device, wherein the lower traction device is connected to the upper traction device through an interference fit of the center traction pin, and the lower traction device comprises a traction pin seat, a traction ball joint, an upper cover, a wedge-shaped pressure block and a traction rod. The center traction pin is interference-pressed in the traction ball joint, and the traction ball joint is interference-pressed on the traction pin seat and fixed by the upper cover. The traction rod is installed on the traction pin seat through fasteners and is rigidly connected to the frame. A wedge-shaped groove is provided at the lower part of the center traction pin for accommodating the wedge-shaped pressure block.

2. The traction device for a permanent magnet direct-drive axle box built-in bogie according to claim 1, characterized in that: The number of the traction rods is two, and the two traction rods are symmetrically arranged in a Z shape on both sides of the traction pin seat.

3. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 1, characterized in that: The traction device also includes a pressure plate, which is arranged below the traction pin seat.

4. The traction device for a permanent magnet direct-drive axle box built-in bogie according to claim 1, characterized in that: The traction pin seat is also provided with a transverse stop seat, a vertical stop seat and a transverse oil pressure shock absorber seat.

5. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 4, characterized in that: The transverse oil shock absorber seat extends longitudinally on the longitudinal center line of the traction device, the vertical stop seat is arranged on the upper surface of the cantilever extending transversely from the traction pin seat, and the transverse stop seat is arranged on the side surface of the end of the traction device.

6. The traction device for a permanent magnet direct-drive axle box built-in bogie according to claim 1, characterized in that: The traction pin seat is a Japanese-shaped box structure with a transversely extending cantilever.

7. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 4, characterized in that: The lateral oil pressure shock absorber seat is U-shaped, and the opening direction faces the outside of the traction device.

8. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 1, characterized in that: A mounting hole is provided in the middle of the traction pin seat, and the traction ball joint is interference-pressed on the traction pin seat through the mounting hole.

9. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 1, characterized in that: Arc-shaped depressions are formed on two opposite lateral sides of the upper traction body.

10. The traction device for a bogie with a built-in permanent magnet direct-drive axle box according to claim 1, characterized in that: The fastener used to connect the traction pin seat and the traction rod is a bolt, and the mounting interface of the bolt is a through hole.

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