A new type of radial mechanism for wheelsets

Abstract

A new type of wheel set radial mechanism relates to a functional component for the running gear of railway freight transport equipment. It includes a U-shaped sub-frame component and a connecting rod connected thereto to form a wheel set radial mechanism, each U-shaped sub-frame component includes a U-shaped sub-frame and a load-bearing saddle, and the connecting rod includes a connecting rod body and elastic hinges at both ends of the connecting rod body. The key technology is to set a dovetail tenon on the U-shaped sub-frame, set a dovetail groove on the load-bearing saddle, and limit the U-shaped sub-frame and the load-bearing saddle by the cooperation of the dovetail tenon and the dovetail groove. The beneficial effect of the present invention is that the U-shaped sub-frame and the load-bearing saddle are connected by the dovetail tenon and dovetail groove to transfer the load, which greatly improves the stress state of the fastener, improves its connection reliability, prolongs its service life, and improves the safety and reliability of the entire wheel set radial mechanism during the use of railway freight cars, ensuring the stability of the vehicle operation quality.

Description

Technical Field

[0001] A wheelset radial mechanism with a new structure relates to a functional component used for a running gear (bogie) of railway freight transport equipment. Background Art

[0002] The radial mechanism of the wheelset is a key functional component of the radial bogie. Its main role in the operation of railway freight cars is as follows: when the vehicle passes through a straight line, the existence of the radial mechanism of the wheelset increases the shear stiffness of the bogie, effectively weakens the shaking motion of the wheelset, and enhances the straight-line operation stability of the vehicle, thereby increasing the critical speed of vehicle operation. At the same time, it also reduces the wheel-rail angle, reduces the impact and wear between the wheel and rail, ensures the safety of vehicle operation, and avoids the deterioration of vehicle operation quality due to excessive wheel diameter difference.

[0003] At present, the connection between the U-shaped auxiliary frame component and the connecting rod in the radial mechanism of most bogie wheels is made by special non-standard round pins, washers, hexagonal slotted nuts and split pins. This connection method can ensure the connection reliability of the mechanism, but it has low economic efficiency in terms of mechanical processing and standardization, especially the special non-standard round pins involved, which have more processing steps, further increasing the manufacturing cost.

[0004] In terms of the connection mode between the radial bearing saddle of the wheelset and the U-shaped auxiliary frame, there are three types of radial bogies for railway freight cars in my country:

[0005] (a) The integral sub-frame wheelset radial mechanism has high manufacturing cost and difficulty, low maintenance processability and high maintenance cost;

[0006] (b) Although some bogies adopt a split structure consisting of a load-bearing saddle and a U-shaped auxiliary frame, and a rubber pad is added to the saddle portion of the load-bearing saddle and the auxiliary frame, there is still room for further optimization of the structure from the perspective of lightweight design concept and manufacturing cost;

[0007] (c) In some radial bogies, the connection between the load-bearing saddle and the U-shaped sub-frame is made of rivets and sleeves, and the connecting holes of the U-shaped sub-frame and the load-bearing saddle are both circular. A transverse plane contact is provided between the U-shaped sub-frame and the load-bearing saddle for positioning when the load-bearing saddle and the sub-frame are connected. In this connection structure, the connecting holes between the load-bearing saddle and the sub-frame are circular holes. To ensure the correct assembly with the load-bearing saddle, the relative shape and position tolerances of the two holes are relatively high during machining, and the machining accuracy is high. Secondly, the plane contact provided between the U-shaped sub-frame and the load-bearing saddle is only used for positioning and has no load transfer function, so there is no obvious improvement on the stress state of the fastener connection. Summary of the invention

[0008] The problem to be solved by the present invention is to provide a radial mechanism for wheelsets that reduces the difficulty of mechanical processing and significantly improves the stress state of fastener connections in view of the above shortcomings. The technical solution is as follows:

[0009] A new type of wheelset radial mechanism, including a U-shaped sub-frame and a connecting rod connected thereto, each U-shaped sub-frame includes a U-shaped sub-frame and a load-bearing saddle, and the connecting rod includes a connecting rod body and elastic hinges at both ends of the connecting rod body. The key technology is to set a dovetail tenon on the U-shaped sub-frame, set a dovetail groove on the load-bearing saddle, and the U-shaped sub-frame and the load-bearing saddle are limited by the cooperation of the dovetail tenon and the dovetail groove.

[0010] The front and rear ends of the load-bearing saddle are respectively provided with first oblong holes, the connecting hole at the end of the U-shaped auxiliary frame is set as a circular hole and the second oblong hole is respectively connected with the first oblong hole.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The U-shaped auxiliary frame and the load-bearing saddle are connected by dovetail tenons and dovetail grooves to transfer loads, which greatly improves the stress state of the fasteners, improves their connection reliability, prolongs their service life, and improves the safety and reliability of the entire wheelset radial mechanism during the use of railway freight cars, ensuring the stability of vehicle operation quality.

[0013] 2. The connection holes of the load-bearing saddle and the U-shaped auxiliary frame adopt a combination of round holes and oblong holes, which reduces the difficulty of mechanical processing and reduces the assembly difficulty caused by the high manufacturing precision of the mechanism, effectively improves the manufacturing and maintenance process, reduces the manufacturing cost, and greatly improves the economic benefits.

[0014] 3. The U-shaped auxiliary frame and the connecting rod are connected by round pins, thereby limiting the z-direction translational freedom of the round pins and improving the reliability of the entire wheelset radial mechanism.

[0015] 4. The U-shaped auxiliary frame and the load-bearing saddle are connected by bolts, nuts and double-ear locking washers, which further reduces the manufacturing cost and ensures the connection reliability of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , is a schematic diagram of the structure of the present invention mounted on a railway freight car running gear;

[0017] Figure 2 , is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 3 , is a schematic diagram of a three-dimensional structure composed of a single U-shaped sub-frame of the present invention;

[0019] Figure 4, is a schematic diagram of the three-dimensional structure of the connecting rod of the present invention;

[0020] Figure 5 , is a partial enlarged view of the round pin limiting structure of the present invention;

[0021] Figure 6 , is a partial enlarged view of the elastic node connection structure of the present invention;

[0022] Figure 7 , is a schematic diagram of the bearing saddle connection structure of the present invention;

[0023] Figure 8 , is a schematic diagram of the design and arrangement of the connection holes of the load-bearing saddle and the U-shaped auxiliary frame of the present invention;

[0024] Fig. 9 , is a schematic diagram of the load-bearing saddle and the U-shaped auxiliary frame connecting fasteners of the present invention. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples, but are not intended to limit the scope of the present invention.

[0026] like Figure 1 to Figure 4 As shown, a new type of wheel set radial mechanism includes a U-shaped sub-frame component 1 and a connecting rod 2 connected thereto to form a wheel set radial mechanism, each U-shaped sub-frame component includes a U-shaped sub-frame 1.1 and a load-bearing saddle 1.5, and the connecting rod includes a connecting rod body 2.1 and elastic hinges 2.2 at both ends of the connecting rod body. The key technology is to set a dovetail tenon 1.1.2 on the U-shaped sub-frame 1.1, set a dovetail groove 1.5.2 on the load-bearing saddle 1.5, and the U-shaped sub-frame 1.1 and the load-bearing saddle 1.5 are limited by the cooperation of the dovetail tenon 1.1.2 and the dovetail groove 1.5.2.

[0027] like Figure 5 As shown, two U-shaped sub-frames 1 and two crossed connecting rods 2 are connected by round pins 3. At the same time, bolt mounting holes with symmetrical structures are arranged on the plane of the transverse arm of the U-shaped sub-frame 1.1, and a first bolt 4, a washer 5, a first nut 6, and a cotter pin 7 are installed along the x direction of the vehicle, thereby limiting the z-direction translational freedom of the round pin 3 and improving the operational reliability of the entire wheelset radial mechanism.

[0028] like Figure 6As shown, an elastic hinge 2.2 is installed in the end hole of the connecting rod body 2.1 of the two connecting rods 2 used to connect the two U-shaped auxiliary frame components 1 through an interference fit structure; and the elastic hinge 2.2 and the round pin 3 are matched through a small gap. The use of such an elastic node connection structure can improve the adaptability of the radial structure of the wheelset to the actual line unevenness, avoid the rigid impact of the front and rear wheelsets in the creep force transmission path; at the same time, it can reduce the assembly difficulty of the mechanism due to manufacturing errors and other problems, and improve production efficiency.

[0029] like Figure 7 As shown, the connection structure between the U-shaped sub-frame 1.1 and the load-bearing saddle 1.5 adopts the dovetail tenon 1.1.2 and dovetail groove 1.5.2 structural connection designed on the main body structure, which realizes the complete constraint between adjacent connecting parts, improves the stress state of the fasteners, has high connection reliability, and ensures the stability of the vehicle's operating performance.

[0030] like Figure 8 As shown, the fastener connection hole between the U-shaped sub-frame 1.1 and the load-bearing saddle 1.5, the load-bearing saddle is provided with the same first oblong hole 1.5.1 at the front and rear, so that the left and right parts do not need to be distinguished during manufacturing; and the connection hole at the end of the U-shaped sub-frame 1.1 is set in a combination mode of a round hole 1.1.1 and a second oblong hole 1.1.3. Under the premise of considering the stress state of this fastener connection method, this design structure greatly reduces the processing accuracy requirements for the position of the connection hole and improves the manufacturing processability.

[0031] like Fig. 9 As shown, the U-shaped auxiliary frame 1.1 and the load-bearing saddle 1.5 are connected by a second bolt 1.3, a second nut 1.4, and a double-ear stop washer 1.2, which further reduces the manufacturing cost and ensures the connection reliability of the mechanism.

[0032] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all implementation methods here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A new type of wheelset radial mechanism, comprising a U-shaped auxiliary frame component (1) and a connecting rod (2) connected thereto, each U-shaped auxiliary frame component comprises a U-shaped auxiliary frame (1.1) and a bearing saddle (1.5), and the connecting rod comprises a connecting rod body (2.1) and elastic hinges (2.2) at both ends of the connecting rod body, wherein the wheelset radial mechanism is characterized in that A dovetail tenon (1.1.2) is arranged on the U-shaped auxiliary frame (1.1), and a dovetail groove (1.5.2) is arranged on the load-bearing saddle (1.5); the U-shaped auxiliary frame (1.1) and the load-bearing saddle (1.5) are limited by the cooperation of the dovetail tenon (1.1.2) and the dovetail groove (1.5.2); bolt mounting holes with symmetrical structures are arranged on the plane of the transverse arm of the U-shaped auxiliary frame (1.1), and a first bolt (4), a washer (5), a first nut (6), and a cotter pin (7) are installed along the vehicle x-direction, thereby limiting the z-direction translational freedom of the round pin (3).

2. According to the new structure of the wheelset radial mechanism of claim 1, it is characterized in that The front and rear ends of the bearing saddle (1.5) are respectively provided with first oblong holes (1.5.1), and the connecting hole at the end of the U-shaped auxiliary frame (1.1) is provided with a circular hole (1.1.1) and a second oblong hole (1.1.3) connected to the first oblong hole (1.5.1).

3. According to the new structure of the wheelset radial mechanism of claim 1, it is characterized in that The connecting rod (2) and the U-shaped auxiliary frame component (1) are connected to the round pin (3) through an elastic hinge (2.2).

4. According to the new structure of the wheelset radial mechanism of claim 1, it is characterized in that The U-shaped auxiliary frame (1.1) and the bearing saddle (1.5) are connected by a second bolt (1.3), a second nut (1.4) and a double-ear stop washer (1.2).

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