Vehicle body and bogie connecting device with stable rotary friction pair

Abstract

The invention relates to a vehicle body and bogie connecting device with a stable rotary friction pair, which comprises a rotary friction structure arranged between a vehicle body and a bogie, and the rotary friction structure provides rotary damping between the vehicle body and the bogie. The rotary friction structure is provided with a first friction area corresponding to the vehicle large curvilinear motion working condition and a second friction area corresponding to the vehicle small curvilinear motion working condition, and the friction coefficient of the first friction area is higher than that of the second friction area. The connecting device is a rotary friction structure arranged between the vehicle body and the bogie, and provides friction force when the vehicle body rotates relative to the bogie. One side of the friction pair can be installed on the swing bolster, and the other side of the friction pair can be installed on a vehicle body. The swing bolster side friction pair abuts against the swing bolster side friction pair through pressure provided by the spring, and it is guaranteed that stable positive pressure is kept between the friction pairs. The friction surface of the vehicle body side friction pair is divided into a high-friction-coefficient area and a low-friction-coefficient area so that different friction forces can be provided under different working conditions of the vehicle.

Description

Technical Field

[0001] This application relates to the field of rail vehicles, specifically a connection device between a car body and a bogie with a stable rotary friction pair, which is applicable to the connection between a car body and a bogie that takes into account both high-speed and extremely small radius curves. Background Art

[0002] The connection methods between the bogie and the car body mainly include the following several types. One is the combined connection of a center pin and air springs, another is the combined use of a center plate and side bearings, and there is also a way to connect the car body and the bogie through a slewing bearing. Among them, the connection method using a slewing bearing can enable the vehicle to pass through curves with extremely small radii. However, because only the slewing bearing transmits the load between the bogie and the car body, the slewing moment is very small, and it cannot meet the stability requirements for the high-speed operation of the vehicle.

[0003] After retrieval, it is found that the Chinese invention patent application CN115817554A discloses a connection device structure between a car body and a bogie applicable to passing through curves with extremely small radii. The structure is applicable to passing through small curves and does not have a rotary friction pair structure, so it cannot guarantee the performance of high-speed operation. Summary of the Invention

[0004] In view of the problems in the related art, the present invention proposes a connection device between a car body and a bogie with a stable rotary friction pair, which can comprehensively solve the above problems. It is proposed to adopt a combined connection method of a slewing bearing and a rotary friction pair, taking into account the requirements of the vehicle's performance in passing through small curves and high-speed operation on straight sections.

[0005] For this purpose, the specific technical solution adopted by the present invention is as follows: A connection device between a car body and a bogie with a stable rotary friction pair, including a rotary friction structure arranged between the car body and the bogie. The rotary friction structure provides rotational damping between the car body and the bogie. The rotary friction structure has a first friction area corresponding to the large curve motion condition of the vehicle and a second friction area corresponding to the small curve motion condition of the vehicle. The friction coefficient of the first friction area is higher than that of the second friction area.

[0006] Furthermore, the rotary friction structure includes a base and a friction block. The base has a friction surface facing the friction block, and the end of the friction block abuts against this friction surface.

[0007] The friction surface at least includes the first friction area located in the central area and the second friction area located on both sides. When the vehicle is in the large curve motion condition, the friction block abuts against the first friction area, providing a large rotary friction force to ensure the stability of the bogie (bolster) and meet the requirements of the vehicle's high-speed operation. When the vehicle is in the small curve motion condition, the friction block abuts against the second friction area, providing a small rotary friction force. Through the rotary action of the slewing bearing, the car body and the bolster can smoothly pass through curves with extremely small radii.

[0008] The connecting device of the present invention is a rotary friction structure provided between the car body and the bogie, which provides frictional force when the car body rotates relative to the bogie. One side of the friction pair (base) can be installed on the bolster, and the other side (friction block) can be installed on the car body. The friction pair on the bolster side (friction block) can be designed as a wear-resistant material, and the stable normal pressure between the friction pairs is ensured by the pressure provided by the spring. The friction surface of the friction pair on the car body side (base) is divided into a high friction coefficient area and a low friction coefficient area to provide different frictional forces under different operating conditions of the vehicle.

[0009] When the vehicle is running under the operating condition of large curve (including straight line) movement, the rotation angle between the car body and the bogie (bolster) is small, and the friction pair is in the first friction area (high friction coefficient area). When the bogie (bolster) and the car body rotate frequently at a small angle, the friction pair provides a large rotary frictional force to ensure the stability of the bogie (bolster) and meet the requirements of high-speed operation of the vehicle.

[0010] For the vehicle running under the operating condition of small curve movement, the car body has a large rotation angle relative to the bogie (bolster), the friction pair is in the second friction area (low friction coefficient area), the friction pair provides a small frictional force, and the car body and the bolster can smoothly pass through a curve with an extremely small radius through the rotation of the rotary bearing.

[0011] It can be seen that the combined connection method of the rotary bearing and the rotary friction structure adopted by the present invention takes into account the performance of the vehicle passing through small curves and the high-speed operation performance on large curve (including straight line) sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic installation diagram of the connecting device of the present invention; Figure 2 It is a schematic overall diagram of the connecting device of the present invention; Figure 3 It is a side view of the connecting device of the present invention; Figure 4 It is a schematic diagram of the friction surface partition of the connecting device of the invention.

[0014] The reference numerals are indicated as follows: 1. Car body; 2. Rotary bearing; 3. Bolster; 4. Rotary friction structure; 41. Base; 42. Friction block; 5. Air spring mounting seat; 6. Spring; 7. Housing. Detailed implementation manners

[0015] To further illustrate each embodiment, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0016] As Figures 1 to 4 shown, in the embodiment of the present invention, the vehicle body and bogie connection device with a stable rotary friction pair includes a rotary friction structure 4 disposed between the vehicle body 1 and the bolster 3 of the bogie. The bolster 3 is connected to the vehicle body 1 through a rotary bearing 2. Air spring mounting seats 5 are provided on the lower surfaces at both ends of the bolster 3, and the bolster is supported on the air springs through the air spring mounting seats 5. The rotary friction structure 4 provides rotational damping between the vehicle body 1 and the bolster 3. In this embodiment, a total of two rotary friction structures 4 are provided, and they are symmetrically disposed with respect to the rotary bearing 2. Of course, it is also feasible to adopt a scheme with four or six rotary friction structures.

[0017] Specifically, in this embodiment, each rotary friction structure 4 includes a base 41 and a friction block 42. Among them, the base 41 is fixed to the vehicle body, and the friction block 42 is fixed to the bolster 3. The base 41 has a friction surface facing the friction block 42, and the end of the friction block 42 abuts against this friction surface. The friction surface of the base 41 is a concave arc surface, and the outer end of the friction block 42 has a convex arc surface adapted to the concave arc surface. The convex arc surface of the friction block 42 abuts against the concave arc surface of the base 41.

[0018] The innovation of the present invention lies in that different friction coefficient regions are set in the rotary friction structure 4, corresponding to the large curve motion condition and the small curve motion condition of the vehicle respectively. That is, the rotary friction structure 4 has a first friction region corresponding to the large curve motion condition of the vehicle and a second friction region corresponding to the small curve motion condition of the vehicle, and the friction coefficient of the first friction region is higher than that of the second friction region.

[0019] As Figure 4As shown, the friction surface 411 of the base 41 includes the first friction area (high friction coefficient area) located in the central region and the second friction areas (low friction coefficient areas) located on both sides. When the vehicle is in the large curve motion condition, the friction block 42 abuts against the first friction area (high friction coefficient area), and the rotary friction structure 4 provides a large rotary friction force to ensure the stable operation of the vehicle under high-speed conditions (the vehicle generally travels at a high speed when passing through a large curve section). When the vehicle is in the small curve motion condition, the friction block 42 abuts against the second friction area (low friction coefficient area), and the rotary friction structure 4 provides a small rotary friction force to ensure that the vehicle can smoothly pass through the small curve section. In the art, large curves and small curves are relatively clear concepts. Generally speaking, a large curve section has a curvature (i.e., turning radius) greater than 300 meters, and a small curve section has a curvature less than 300 meters.

[0020] In order to enable the rotary friction structure 4 to provide a stable rotary friction force, the device of this embodiment further includes an elastic device that provides a pressing force for the rotary friction structure 4. As Figure 3 shown, the elastic device includes a housing 7 fixed to the bolster 3 and a spring 6 placed inside the housing 7. The spring 6 abuts against the friction block 42 to provide a pressing force for the rotary friction structure 4. In this embodiment, the parameter of the spring is: 50 N / mm.

[0021] In the rotary friction structure of the present invention, the friction coefficient of each friction area can be a fixed value, or a linear or non-linear layout that is high in the middle and low on the outside. As another feasible solution, a third friction coefficient area can also be provided between the first friction area and the second friction area, and the friction coefficient of the third friction coefficient area is between that of the first friction area and the second friction area. Additionally, the entire friction surface can adopt a linear or non-linear change layout that is high in the middle and low on both sides, which can also achieve the solution of the present invention. The establishment of different friction coefficients can be achieved by setting different surface roughnesses on the friction surface. In this embodiment, the surface roughness of the first friction area is Ra 6 microns, and the surface roughness of the second friction area is Ra 0.3 microns. The friction coefficient is not only related to the roughness of the friction surface but also related to the materials of the friction surface and the friction block 12. In this embodiment, the base is made of 45# steel, and the friction block 42 is made of a wear-resistant material: reinforced PA66. Of course, it is also feasible that the part of the friction block 42 in contact with the base 41 is made of a wear-resistant material. When the friction block 42 is worn to the limit, it can be replaced.

[0022] In this embodiment, the height of the friction surface is 100 mm, the radius of curvature is 1,125 mm, the radian is 28 degrees (plus or minus 14 degrees from the horizontal center), and the arc length is 550 mm. The radian of the first friction area (high friction coefficient) is 10 degrees. There are two second friction areas (low friction coefficient), which are located on both sides of the first friction area respectively, and the radian of each second friction area is 7 degrees. The height of the end of the friction block 42 is 80 mm, and the width of the end of the friction block 42 is 80 mm.

[0023] In the first friction area, the friction coefficient of the rotary friction structure 4 is 0.8, and the maximum sliding friction force provided is 4 kN. In the second friction area, the friction coefficient of the rotary friction structure 4 is 0.18, and the maximum sliding friction force provided is 0.9 kN.

[0024] When the vehicle runs straight or on a large curve, the vehicle running speed is relatively fast, and the rotary friction structure 4 is in the first friction area (high friction coefficient area), providing a large rotary friction force to ensure the stability of the vehicle and reduce the shaking or vibration of the vehicle. When the vehicle passes through a small curve section, the vehicle and the bolster rotate a large angle around the rotary bearing 2, and the friction block 42 slides from the first friction area to the second friction area. At this time, the rotary friction structure 4 provides a small rotary friction force, enabling the vehicle to pass through the small curve section smoothly.

[0025] As another easily conceivable alternative: the base 41 is fixed to the bolster 3, and the friction block 42 is fixed to the car body 1. In such an embodiment, the friction surface of the base 41 is a convex arc surface, and the end of the friction block 42 has a concave arc surface adapted to the convex arc surface. The concave arc surface of the friction block 42 abuts against the convex arc surface of the base 41, thereby providing a stable friction force.

[0026] In addition, the embodiment of the present invention further provides a rail vehicle, which has the above-mentioned car body and bogie connection device with a stable rotary friction pair.

[0027] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A car body and bogie connection device with a stable rotary friction pair, comprising a rotary friction structure (4) arranged between the car body (1) and the bogie (3), the rotary friction structure (4) providing rotation damping between the car body (1) and the bogie (3), the rotary friction structure (4) having a first friction area corresponding to a large curve motion condition of the vehicle and a second friction area corresponding to a small curve motion condition of the vehicle, the friction coefficient of the first friction area being higher than the friction coefficient of the second friction area.

2. The car body and bogie connection device with a stable rotation friction pair according to claim 1, characterized in that: The rotary friction structure comprises a base (41) and a friction block (42); the base (41) has a friction surface facing the friction block (42), and the end of the friction block (42) abuts against the friction surface.

3. The car body and bogie connection device with a stable rotation friction pair according to claim 2, characterized in that: The friction surface comprises at least the first friction area located in the central area and the second friction areas located on both sides; when the vehicle is moving in a large curve, the friction block (42) abuts against the first friction area; when the vehicle is moving in a small curve, the friction block (42) abuts against the second friction area.

4. The car body and bogie connection device with a stable rotary friction pair according to claim 2, characterized in that: The base (41) is fixed to the vehicle body, and the friction block (42) is fixed to the bogie (3). The friction surface of the base (41) is a concave arc surface, and the outer end of the friction block (42) has a convex arc surface adapted to the concave arc surface. The convex arc surface of the friction block (42) abuts against the concave arc surface of the base (41).

5. The car body and bogie connection device with a stable rotation friction pair according to claim 2, characterized in that: The base (41) is fixed to the bogie (3), and the friction block (42) is fixed to the vehicle body. The friction surface of the base (41) is an outer convex arc surface, and the end of the friction block (42) has an inner concave arc surface adapted to the outer convex arc surface. The inner concave arc surface of the friction block (42) abuts against the outer convex arc surface of the base (41).

6. The car body and bogie connection device with a stable rotation friction pair according to claim 2, characterized in that: It also includes an elastic device for providing a pressing force for the rotary friction structure (4).

7. The car body and bogie connection device with a stable rotation friction pair according to claim 6, characterized in that: The elastic device comprises a housing (7) and a spring (6) disposed in the housing (7); the spring (6) presses against the friction block (42) to provide a pressing force for the rotary friction structure (4).

8. The car body and bogie connection device with a stable rotation friction pair according to claim 6, characterized in that: The invention comprises at least two rotary friction structures (4) which are symmetrically arranged relative to the rotary bearing (2).

9. The car body and bogie connection device with a stable rotary friction pair as claimed in claim 2, characterized in that: The portion of the friction block (42) in contact with the base (41) is abrasive material.

10. A rail vehicle, characterized in that: A car body and bogie connection device with a stable rotating friction pair as described in any one of claims 1 to 9.

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