A traction device for a permanent magnet direct drive axle box built-in bogie

Abstract

The application discloses a traction device for a permanent magnet direct drive axle box built-in bogie, which comprises an upper traction device and a lower traction device. The upper traction device is connected with a vehicle body frame and comprises an upper traction body and a central traction pin. The upper part of the central traction pin is press-fitted into the upper traction body. The lower traction device is in interference fit with the upper traction device. The lower traction device comprises a traction pin seat, a traction ball hinge, an upper cover, a wedge-shaped pressing block and a traction pull rod. The central traction pin is press-fitted into the traction ball hinge, the traction ball hinge is press-fitted into the traction pin seat, the traction pull rod is installed on the traction pin seat, and the lower part of the central traction pin is provided with a wedge-shaped groove and a wedge-shaped pressing block. The traction device can meet the functional requirements and space requirements of the permanent magnet direct drive axle box built-in bogie, has the advantages of high strength, light weight, small profile size and high integration, and is more compact and reasonable in overall arrangement, has smaller installation space requirement, and saves the labor, material and other costs of installation safety steel cables.

Description

Technical Field

[0001] This invention relates to the field of traction device technology, and in particular to a traction device for a bogie with a permanent magnet direct drive axle box. Background Technology

[0002] The traction system is a crucial component of the secondary suspension in urban rail transit vehicles. It typically includes the upper traction body, traction pin, traction pin seat, center ball joint, upper cover, and traction rod. The traction system is generally used for the flexible connection between the bogie and the car body, mitigating vibrations between them to some extent. Besides bearing the vertical weight of the car body, the traction system is also responsible for transmitting the traction and braking forces generated by the bogie to the car body, and, when necessary, transmitting lateral forces and torques between the bogie and the car body.

[0003] During the development of the permanent magnet direct-drive axle box-integrated bogie, in order to enhance the bogie's curve-passing ability and achieve lightweight design, a direct-drive solution using a permanent magnet motor and an integrated axle box were adopted. This resulted in a reduction in the bogie's wheelbase and side beam lateral span, making the bogie smaller than a conventional bogie, and significantly limiting the available space for equipment installation. Conventional traction devices could not meet the existing installation space requirements.

[0004] For example, Chinese patent application number 201120079027.6, filed on March 23, 2011, discloses a longitudinal traction device for the center pin of an urban rail vehicle. Specifically, it discloses a traction seat, a frame, a traction rod assembly, a lateral damper 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 damper mounting seat. The lateral stop device consists of a lateral stop seat and a lateral stop set on the lateral stop seat. The frame is additionally provided with a yaw stop device. The traction rod of the traction rod assembly is arc-shaped and has traction rubber joints at both ends.

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

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

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

[0008] According to one aspect of the present invention, a traction device for a permanent magnet direct-drive axle box-integrated bogie is provided, comprising:

[0009] The upper traction device includes an upper traction body and a central traction pin. The upper traction body is fixedly connected to the vehicle chassis frame by fasteners, and the upper part of the central traction pin is press-fitted onto the upper traction body.

[0010] The lower traction device is connected to the upper traction device by an interference fit of the central 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 central traction pin is interference-fitted into the traction ball joint, which is interference-fitted into the traction pin seat and fixed by the upper cover. The traction rod is installed on the traction pin seat by fasteners and is rigidly connected to the frame. A wedge-shaped groove is provided at the lower part of the central traction pin to accommodate the wedge-shaped pressure block.

[0011] According to one embodiment of the present invention, there are two traction rods, which are arranged in a Z-shape and symmetrically on both sides of the traction pin seat.

[0012] According to one embodiment of the present invention, the traction device further includes a pressure plate disposed below the traction pin seat.

[0013] According to one embodiment of the present invention, the traction pin seat is further provided with a lateral stop seat, a vertical stop seat and a lateral hydraulic damper seat.

[0014] According to one embodiment of the present invention, the lateral hydraulic damper seat extends longitudinally along the longitudinal centerline of the traction device, the vertical stop seat is disposed on the upper surface of the cantilever extending laterally from the traction pin seat, and the lateral stop seat is disposed on the side elevation of the end of the traction device.

[0015] According to one embodiment of the present invention, the traction pin seat is a box-shaped structure with a laterally extending cantilever.

[0016] According to one embodiment of the present invention, the lateral hydraulic damper seat is U-shaped, with the opening facing outwards from the traction device.

[0017] 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 into the traction pin seat through the mounting hole.

[0018] According to one embodiment of the present invention, the upper traction body forms arc-shaped recesses on opposite sides in the lateral direction.

[0019] 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.

[0020] In a traction device for a bogie with a built-in permanent magnet direct drive axle box according to an embodiment of the present invention, the functional and space requirements of the bogie with a built-in permanent magnet direct drive axle box can be met. It has the advantages of high strength, light weight, small profile size and high integration. The overall layout is more compact and reasonable, the installation space requirement is smaller, and the labor and material costs for installing safety cables are saved. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a traction device for a permanent magnet direct drive axle box integrated bogie is shown according to an exemplary embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of a traction device for a permanent magnet direct drive axle box integrated bogie is shown according to an exemplary embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a traction device and related secondary suspension components for a permanent magnet direct drive axle box built-in bogie according to an exemplary embodiment of the present invention is shown.

[0025] Figure 4 A schematic diagram of the upper traction body of a traction device for a permanent magnet direct drive axle box built-in bogie according to an exemplary embodiment of the present invention is shown;

[0026] Figure 5 A schematic diagram of a traction pin seat for a traction device for a bogie built into a permanent magnet direct drive axle box according to an exemplary embodiment of the present invention is shown.

[0027] In the diagram:

[0028] 1. Upper traction body; 2. Central traction pin; 3. Traction pin seat; 4. Traction ball joint; 5. Top cover; 6. Wedge-shaped pressure block; 7. Traction rod; 8. Lateral hydraulic damper; 9. Lateral stop; 10. Vertical stop; 11. Pressure plate; 12. Lateral stop seat; 13. Vertical stop seat; 14. Lateral hydraulic damper seat; 15. Traction rod seat. Detailed Implementation

[0029] The following detailed description of the embodiments is intended to exemplify the principles of the present invention, but should not be construed as limiting the scope of the 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.

[0030] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0031] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0033] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0034] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0035] Existing patent solutions are all for products of conventional locomotive bogies and urban rail bogies. The structure of the traction device is relatively fixed and single, and at the same time, the contour size is large, requiring a large space for installation, which is not suitable for the narrow secondary lateral installation space of the permanent magnet direct drive axle box built-in bogie.

[0036] As Figure 1 and 2 shown, 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 car 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 pull 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 pull rod 7 is installed on the traction pin seat 3 through fasteners and is rigidly connected to the bogie frame, and 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 limit, so as to realize the function of transmitting the transverse, longitudinal and vertical loads between the bogie and the car body.

[0037] The transverse, longitudinal and vertical forces generated by the bogie are transmitted to the traction pin seat 3 through the traction pull rod 7, and then transmitted to the car body through the traction ball joint 4, the central traction pin and the upper traction body 1.

[0038] 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 making vertical relative movement with the traction ball joint 4 during use.

[0039] In the traction device for a permanent magnet direct drive axle box built-in bogie according to an embodiment of the present invention, it can meet the functional requirements and space requirements of the permanent magnet direct drive axle box built-in bogie, and has the advantages of high strength, light weight, small contour size and high integration. The overall layout is more compact and reasonable, the demand for installation space is smaller, and the costs of labor, materials, etc. for installing safety steel cables are saved.

[0040] In addition to ensuring the basic functions of the traction device, this application also has the function of overall lifting of the secondary system and the function of restricting 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.

[0041] In some specific embodiments, there are two traction rods 7, which are arranged symmetrically in a Z-shape on both sides of the traction pin seat 3. The Z-shape structure ensures that the traction and braking forces transmitted by the traction device are parallel to the four vertical planes of the box-shaped structure, which is most conducive to the stability of the box-shaped structure. When the traction rod 7 bends and deforms, it generates a restoring force, which can be used to restrain the lateral sway of the vehicle body. The traction rods 7 are mounted on the traction rod seat 15.

[0042] Based on the above embodiments, the traction device also includes a pressure plate 11, which is disposed 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 distributing the applied pressure. Through its large contact area and robust structure, the pressure plate 11 can evenly distribute the traction force to various components, thereby reducing the risk of localized damage or deformation. This dispersion effect helps to extend the service life of the traction device and improve its durability.

[0043] like Figure 3 As shown, in some specific embodiments, the traction pin seat 3 is also provided with a lateral stop seat 12, a vertical stop seat 13 and a lateral hydraulic damper seat 14, which are used to support the lateral stop 9, the vertical stop 10 and the lateral hydraulic damper 8 respectively.

[0044] In some specific embodiments, the lateral hydraulic damper seat 14 extends longitudinally along the longitudinal centerline of the traction device, the vertical stop seat 13 is disposed on the upper surface of the cantilever extending laterally from the traction pin seat 3, and the lateral stop seat 12 is disposed on the side elevation of the end of the traction device.

[0045] The lower traction device has an integrated vertical stop 10 at the cantilever end, which can still limit the overcharging of the air spring and enable the traction device to lift as a whole when the bogie is not equipped with a safety cable.

[0046] The lower traction device integrates a longitudinally extending transverse hydraulic damper seat 14, and the installation 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 hydraulic dampers 8 and one traction device can be arranged in a narrow transverse space.

[0047] The lower traction device integrates a transverse stop 9 at the cantilever end. The installed transverse stop 9 is located near the side beam of the frame, which greatly simplifies the cantilever structure of the impact seat of the transverse stop 9 located on the side beam, reduces the processing difficulty of the impact seat, and enhances the structural stability of the impact seat.

[0048] Based on the above embodiments, the traction pin seat 3 is a H-shaped box structure with a cantilever that extends laterally.

[0049] In some specific embodiments, the lateral hydraulic damper seat 14 is U-shaped, with the opening facing outwards from the traction device.

[0050] Based on the above embodiments, a mounting hole is provided in the middle of the traction pin seat 3, and the traction ball joint 4 is press-fitted into the traction pin seat 3 through the mounting hole. Specifically, the mounting hole is cylindrical.

[0051] like Figure 4 As shown, in some specific embodiments, the upper traction body 1 has arc-shaped recesses on its lateral sides, meaning its outer contour is an arc shape that is wider at the top and narrower at the bottom. The upper traction body 1 is designed with targeted narrowing and lightweighting, and the mounting interfaces of the lateral hydraulic damper 8, lateral stop 9, and vertical stop 10 are located in the lower traction device, which can further reduce the contour size of the upper traction body 1, allowing the upper traction body 1 to be placed within the limited lateral span of the air spring.

[0052] To accommodate the smaller lateral span of the secondary air springs in the permanent magnet direct-drive axle box-integrated bogie, the upper traction body 1 features a specially narrowed design. Considering the dynamic displacement of the air springs, the upper traction body 1 also incorporates a unique arc-shaped profile. To further reduce the lateral dimensions of the upper traction body 1, the lateral stop 9 and lateral hydraulic damper 8, typically located on the upper traction body 1, are mounted on the traction pin seat 3 of the lower traction body. This smaller upper traction body 1 avoids interference with the air springs during relative displacement between the bogie and the car body. The upper traction body 1 has a compact structure, requires minimal installation space, and represents a relatively complete upper traction body solution for permanent magnet direct-drive axle box-integrated bogies.

[0053] like Figure 5 As shown, based on the above embodiments, the fastener used to connect the traction pin seat and the traction rod is a bolt, and the bolt mounting interface is a through hole. Both ends of the traction rod 7 are fastened with bolts and nuts, and the bolt mounting interface of the traction pin seat 3 is a through hole, thereby reducing the processing risk of thread tapping in the traditional blind hole of the traction pin seat 3 and the scrap rate of the traction pin seat 3.

[0054] The drawbar pin seat 3 is a horizontally extended cantilever "day" - shaped box structure, integrating the drawbar seat 15, the lateral hydraulic shock absorber seat 14, the lateral stop seat 12 and the vertical stop seat 13. The cylindrical mounting hole for placing the drawbar ball joint 4 naturally serves as the stiffener of the entire box structure, dividing the drawbar pin seat 3 into two cavity areas for accommodating the rubber joints of the drawbar 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. This structure of the drawbar pin seat 3 has the characteristics of 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 profile dimension is only the length of two symmetrically arranged lateral hydraulic shock absorbers 8, which is significantly better than the ordinary scheme where the overall lateral profile dimension is the length of two lateral hydraulic shock absorbers 8 plus the length of a traction device.

[0055] The layout scheme of the lateral hydraulic shock absorber 8 in 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 vertical side surface at the end of the horizontally extended cantilever, making the lateral stop 9 close to the frame side beam. 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 stronger and more durable.

[0056] The drawbar pin seat 3 is also provided with a vertical stop 10. The vertical stop 10 and the adjusting gasket are installed on the upper plane of the horizontally extended cantilever of the drawbar pin seat 3, which 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. This drawbar pin 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, and the overall layout is very compact under the premise of meeting the functional requirements, which is a relatively perfect structural scheme for the drawbar pin seat 3.

[0057] After the implementation of the present invention, it has at least the following beneficial effects:

[0058] (1) Considering the relatively small lateral span and dynamic contour of the air spring of the permanent - magnet direct - drive axle - box - built bogie, the upper traction body is specifically horizontally narrowed, enabling the upper traction body to be installed and used within the limited lateral span of the air spring.

[0059] (2) The drawbar pin seat of the lower traction device adopts a double - arm horizontally extended "day" - shaped box structure, and is light - weighted designed while ensuring strength, integrating the lateral hydraulic shock absorber seat, the lateral stop seat and the vertical stop seat.

[0060] (3) Extending the U-shaped transverse hydraulic damper seat longitudinally along the longitudinal center line of the traction pin seat can make the arrangement of the transverse hydraulic damper more compact, the overall transverse profile of the traction device and the transverse hydraulic damper smaller, and the installation space requirement smaller.

[0061] (4) A transverse stop seat is provided on the side facade of the cantilever end of the horizontal extension of the traction pin seat, extending the installation position of the transverse stop to the vicinity of the side beam impact seat, simplifying the structure of the side beam impact seat, reducing the processing difficulty, and strengthening the stability of the structure.

[0062] (5) A vertical stop seat is set on the upper plane of the cantilever end of the traction pin seat. The setting of the vertical stop can restrict the vertical movement of the secondary system and limit the overcharging of the air spring. Without the safety steel cable, the traction device can have the function of overall lifting. The bogie does not need to be equipped with a safety steel cable, which contributes more installation space to other equipment of the bogie and saves the labor and material costs of installing the safety steel cable.

[0063] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0064] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A traction device for a bogie built into a permanent magnet direct drive axle box, characterized in that, include: An upper traction device, comprising an upper traction body and a central traction pin, wherein the upper traction body is fixedly connected to the vehicle chassis frame by fasteners, and the upper part of the central traction pin is press-fitted onto the upper traction body; and The lower traction device is connected to the upper traction device via an interference fit of the central 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 central traction pin is interference-fitted into the traction ball joint, which is interference-fitted into the traction pin seat and fixed by the upper cover. The traction rod is mounted on the traction pin seat by fasteners and rigidly connected to the frame. A wedge-shaped groove is provided at the lower part of the central traction pin to accommodate the wedge-shaped pressure block. The traction pin seat is also provided with a transverse stop seat, a vertical stop seat and a transverse hydraulic damper seat; The lateral hydraulic damper seat extends longitudinally along the longitudinal centerline of the traction device, the vertical stop seat is disposed on the upper surface of the cantilever extending laterally from the traction pin seat, and the lateral stop seat is disposed on the side elevation of the end of the traction device. The traction pin seat is a box-shaped structure with a laterally extending cantilever. The transverse hydraulic damper seat is U-shaped, with the opening facing outwards from the traction device; The upper traction body forms arc-shaped indentations on opposite sides in the lateral direction.

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

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

4. The traction device for a bogie built into a permanent magnet direct drive axle box according to claim 1, characterized in that, The traction pin seat has a mounting hole in the middle, and the traction ball joint is press-fitted into the traction pin seat through the mounting hole.

5. The traction device for a bogie built into a 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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