Railway vehicle traction device suitable for meter-gauge short-axle universal shaft transmission system

Abstract

The application provides a rail vehicle traction device suitable for a meter-gauge short-axle universal shaft transmission system, and relates to the technical field of urban rail transit vehicles, which comprises an upper traction body and a lower traction body. The upper traction body is integrally cast with a center pin and is fixed on the lower plane of a vehicle body underframe. The lower traction body is internally provided with a center spherical hinge. The upper plane of the center spherical hinge is fixed on the upper plane of the lower traction body through an upper cover. The lower part of the upper traction body is in interference fit with the center spherical hinge. Each of the two suspension arms of the lower traction body is connected with one end of a traction pull rod. The other end of the traction pull rod is connected with a frame cross beam. The suspension arms of the lower traction body are provided with lateral shock absorber seats for connecting lateral oil pressure shock absorbers. The traction structure can avoid the universal shaft under the condition that the height of the traction point of the vehicle does not affect the axle load transfer, so as to meet the space limiting requirement and mechanical performance requirement of the bogie of the meter-gauge short-axle universal shaft transmission system.

Description

Technical Field

[0001] This invention relates to the field of urban rail transit vehicle technology, and more particularly to a rail vehicle traction device suitable for meter gauge short wheelbase universal joint drive system. Background Technology

[0002] The central traction unit is a crucial component of the secondary suspension system in urban rail transit vehicles. Installed in the middle of the bogie, it typically consists of an upper traction body, a center pin, a lower traction body (also known as a traction beam), a center ball joint, traction rods, lateral stops, and lateral shock absorbers. It connects the bogie to the car body, transmits traction or braking forces between the car body and the bogie, and prevents the vehicle from experiencing rigid impacts.

[0003] Among existing central traction devices, CN 204506906U discloses a traction device for a bogie of a high-speed train, including a traction pin. The traction pin includes a center pin seat and a center pin press-fitted with the center pin seat. The center pin has a wedge-shaped structure, with an end face boss at the top of the center pin seat having a diameter larger than the center hole of the center pin seat, and an internal threaded hole at the bottom. This patent optimizes the structure of the traction device, making the strength distribution of the components reasonable during manufacturing, and can effectively prevent fasteners from loosening, ensuring the safe operation of the traction device.

[0004] However, during the research and design of meter-gauge short-wheelbase universal joint drive system bogies, the special operating conditions imposed very stringent space constraints on the central traction device, increasing the difficulty of its layout. The traction device for a high-speed train bogie designed in patent CN 204506906 U is heavy, structurally bulky, and has relatively small rotational and vertical displacement, making it only suitable for conventional urban rail vehicles. It cannot meet the application requirements of bogies with a center-mounted longitudinal universal joint drive system. Existing central traction devices cannot simultaneously meet the space constraints and performance requirements of meter-gauge short-wheelbase universal joint drive system bogies. Summary of the Invention

[0005] To address the technical problem that existing central traction devices cannot simultaneously meet the spatial limitation and performance requirements of bogies in meter-gauge short-wheelbase universal joint drive systems, this invention provides a traction device suitable for meter-gauge short-wheelbase universal joint drive systems. The invention primarily designs a novel structure that simultaneously satisfies the bogie's requirements for spatial limitation, rotational range, and vertical displacement.

[0006] The technical means employed in this invention are as follows:

[0007] A traction device for a rail vehicle with a short wheelbase universal joint drive system for meter gauge tracks includes an upper traction body and a lower traction body. The upper traction body is fixed to the lower plane of the car body underframe. A central ball joint is provided inside the lower traction body. The upper plane of the central ball joint is fixed to the upper plane of the lower traction body through an upper cover. The lower part of the upper traction body is interference-fitted with the central ball joint. Each of the two connecting arms of the lower traction body is connected to one end of a traction rod. The other end of the traction rod is connected to a frame crossbeam. A transverse damper seat for connecting a transverse hydraulic damper is provided on the outer side of the cantilever of the lower traction body.

[0008] Furthermore, the upper traction body includes an upper traction platform, with a central pin protruding downward at the center of the lower surface of the upper traction platform, and two transverse stop seats protruding downward on both sides of the lower surface of the upper traction platform.

[0009] Furthermore, the lower traction body includes a lower traction platform, with cantilever arms extending downward on both sides of the lower traction platform, and connecting arms extending longitudinally at the ends of the cantilever arms; the connecting arms on both sides extend in opposite longitudinal directions, making the side view of the lower traction body a herringbone structure; a vertical through hole is provided at the center of the lower traction platform, and a central ball joint is provided in the vertical through hole, with the lower end of the central pin having a tapered interference fit with the central ball joint.

[0010] Furthermore, a groove is provided on the lower surface of the lower traction platform, and the lower end of the center pin protrudes from the lower plane of the lower traction platform and is fixed by a pressure plate, which is located in the groove.

[0011] Furthermore, the end of the connecting arm is provided with an interface, which is connected to the traction rod. The interface is a through hole, and the traction rod is arranged longitudinally and in opposite directions.

[0012] Furthermore, the cantilever is provided with several through holes in both the lateral and longitudinal directions.

[0013] Furthermore, the upper traction platform has an internal cavity.

[0014] Furthermore, the upper traction platform is provided with several bolt through holes, and the bolts pass through the bolt through holes to fix the upper traction body to the lower plane of the vehicle body frame.

[0015] Furthermore, a boss is provided on the lower inner side of the vertical through hole to stop the central ball joint.

[0016] Furthermore, the rubber joint interfaces on both sides of the traction rod are aligned.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The upper traction body is flattened and lightweight to squeeze out a large amount of vertical space. Without affecting the transfer of vehicle axle load, in order to avoid the universal joint and at the same time ensure the maximum displacement of the vehicle's primary and secondary suspensions, this invention innovatively designs the lower traction body as a double cantilever structure with a "V" shape in the forward direction, which satisfies both the space limitation requirements and the performance requirements of the traction device.

[0019] This invention ensures that the height of the vehicle's traction point does not affect the transfer of axle load, while allowing the traction structure to avoid the universal joint, thus meeting the space limitation requirements of the bogie for the meter-gauge short-wheelbase universal joint drive system.

[0020] This invention possesses superior mechanical properties to meet the requirements of vehicle suspension displacement and rotation angle. The traction device of a conventional 80B platform rail vehicle has a rotation range of approximately 5.4° and a vertical displacement of 35mm upwards and 50mm downwards. In contrast, the traction device designed in this invention boasts a rotation range of up to 13° and a vertical displacement of 40mm upwards and 60mm downwards, representing a 140% increase in rotation range and a 17.6% increase in vertical displacement compared to conventional 80B rail vehicles.

[0021] The upper traction device of a conventional 80B platform rail vehicle weighs approximately 210 kg, and the lower traction device weighs approximately 120 kg. This invention, through a lightweight structural design, reduces the weight of the upper traction device to 95 kg and the lower traction device to 130 kg. The upper traction device is 54.8% lighter than that of a conventional 80B rail vehicle, and the overall weight is 31.8% lighter than a conventional 80B urban rail vehicle.

[0022] This invention features an innovative structural design, low space requirements, and high application performance, making it highly scalable and promising for market application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a front sectional view of the overall structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the traction body structure of the present invention.

[0027] Figure 4 This is a front sectional view of the traction body of the present invention.

[0028] Figure 5 This is a schematic diagram of the traction body structure of the present invention.

[0029] Figure 6 This is a side view of the lower traction body of the present invention.

[0030] In the diagram: 1. Upper traction body; 2. Lower traction body; 3. Central ball joint; 4. Upper cover; 5. Cantilever; 6. Traction rod; 7. Lateral damper seat; 8. Upper traction platform; 9. Central pin; 10. Lateral stop seat; 11. Lower traction platform; 12. Connecting arm; 13. Pressure plate; 14. Interface. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] like Figure 1-6As shown, the present invention provides a traction device for a rail vehicle with a short wheelbase universal joint drive system for meter gauge rails, including an upper traction body 1 and a lower traction body 2. The upper traction body 1 is fixed on the lower plane of the car body underframe. The lower traction body 2 has a central ball joint 3 inside. The upper plane of the central ball joint 3 is fixed to the upper plane of the lower traction body 2 through an upper cover 4. The lower part of the upper traction body 1 is interference-fitted with the central ball joint 3. Each of the two connecting arms 12 of the lower traction body 2 is connected to one end of a traction rod 6. The other end of the traction rod 6 is connected to the frame crossbeam. A transverse damper seat 7 for connecting a transverse hydraulic damper is provided on the outer side of the cantilever 5 of the lower traction body 2.

[0039] The upper traction body 1 has an inverted "mountain" shaped structure. The upper traction body 1 includes an upper traction platform 8. A center pin 9 protrudes downwards at the center of the lower surface of the upper traction platform 8, and a threaded hole is provided at the center of the lower end face of the center pin 9. Two transverse stop seats 10 protrude downwards on both sides of the lower surface of the upper traction platform 8. A cavity is provided inside the upper traction platform 8. Several bolt through holes are provided on the upper traction platform 8, and bolts pass through these holes to fix the upper traction body 1 to the lower plane of the vehicle body chassis.

[0040] The lower traction body 2 includes a lower traction platform 11. The lower traction platform 11 extends downwards on both sides to form cantilever arms 5, and the ends of the cantilever arms 5 extend longitudinally to form connecting arms 12. The connecting arms 12 on both sides extend in opposite longitudinal directions, giving the lower traction body 2 a herringbone structure in its side view. A vertical through hole is provided at the center of the lower traction platform 11, and a central ball joint 3 is provided within the vertical through hole. A boss with a diameter smaller than the through hole is provided on the lower inner side of the vertical through hole to stop the central ball joint 3. The lower end of the central pin 9 has a tapered interference fit with the central ball joint 3. A groove is provided on the lower surface of the lower traction platform 11. The lower end of the central pin 9 protrudes from the lower plane of the lower traction platform 11 and is fixed by a pressure plate 13 and bolts. The pressure plate 13 is located within the groove. An interface 14 is provided at the end of the connecting arm 12. The interface 14 is connected to the traction rod 6. The interface 14 is a through hole, which prevents stripping of blind bolts from damaging the structural strength of the lower traction body 2. The traction rods 6 are arranged longitudinally and in opposite directions, forming a stable and reliable front-to-back structure. The cantilever 5 has several through holes in both its transverse and longitudinal directions. The rubber joint interfaces 14 on the traction rods 6 on both sides are in the same direction.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A traction device for rail vehicles with a short wheelbase universal joint drive system for meter gauge tracks, characterized in that: The vehicle includes an upper traction body (1) and a lower traction body (2). The upper traction body (1) is fixed on the lower plane of the vehicle body frame. The lower traction body (2) has a central ball joint (3) inside. The upper plane of the central ball joint (3) is fixed to the upper plane of the lower traction body (2) through the upper cover (4). The lower part of the upper traction body (1) is interference-fitted with the central ball joint (3). Each of the two connecting arms (12) of the lower traction body (2) is connected to one end of a traction rod (6). The other end of the traction rod (6) is connected to the frame beam. A transverse damper seat (7) for connecting a transverse hydraulic damper is provided on the outside of the cantilever (5) of the lower traction body (2). The upper traction body (1) includes an upper traction platform (8), with a central pin (9) protruding downward at the center of the lower surface of the upper traction platform (8), and two transverse stop seats (10) protruding downward on both sides of the lower surface of the upper traction platform (8). The lower traction body (2) includes a lower traction platform (11), with the lower traction platform (11) extending downward on both sides to form cantilever (5), and the ends of the cantilever (5) extending longitudinally to form connecting arms (12); the connecting arms (12) on both sides extend in opposite longitudinal directions, so that the side view of the lower traction body (2) has a herringbone structure; a vertical through hole is provided at the center of the lower traction platform (11), and a central ball joint (3) is provided in the vertical through hole, with the lower end of the central pin (9) and the central ball joint (3) having a tapered interference fit.

2. The rail vehicle traction device for a short-wheelbase universal joint drive system according to claim 1, characterized in that, The lower surface of the lower traction platform (11) is provided with a groove. The lower end of the center pin (9) protrudes from the lower plane of the lower traction platform (11) and is fixed by a pressure plate (13). The pressure plate (13) is located in the groove.

3. The rail vehicle traction device for a short-wheelbase universal joint drive system according to claim 1, characterized in that, The end of the connecting arm (12) is provided with an interface (14), which is connected to the traction rod (6). The interface (14) is a through hole, and the traction rod (6) is arranged longitudinally and in opposite directions.

4. The rail vehicle traction device for a short-wheelbase universal joint drive system according to claim 1, characterized in that, The cantilever (5) has several through holes in its horizontal and vertical directions.

5. The rail vehicle traction device for a short-wheelbase universal joint drive system according to claim 1, characterized in that, The upper traction platform (8) has a cavity inside.

6. The rail vehicle traction device according to claim 1, applicable to a meter-gauge short-wheelbase universal joint drive system, is characterized in that, The upper traction platform (8) has several bolt through holes. After the bolts pass through the bolt through holes, the upper traction body (1) is fixed to the lower plane of the vehicle body frame.

7. The rail vehicle traction device according to claim 1, applicable to a meter-gauge short-wheelbase universal joint drive system, is characterized in that, The lower inner side of the vertical through hole is provided with a boss for stopping the central ball joint (3).

8. The rail vehicle traction device for a short-wheelbase universal joint drive system according to claim 1, characterized in that, The rubber joint interfaces (14) on the traction rods (6) on both sides are in the same direction.

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