Axial limiting structure of dust cover of anti-dropping shock absorber of train

Abstract

The utility model belongs to the field of rail transit vehicle engineering, especially relate to a kind of dust cover axial limiting structure of anti-drop train shock absorber, including connecting frame, limit disc one, fixed peg, limit disc two, sleeve one and sleeve two etc., two limit disc ones are installed in the upper portion both sides of connecting frame by multiple fixed pegs, there are four limit disc ones, sleeve one is vertically fixedly connected in the bottom of each limit disc one, sleeve two is slidably sleeved on the outside of each sleeve one, limit disc two is fixedly connected in the bottom of each sleeve two, limit disc two and limit disc one are consistent in quantity and same in structure. Sliding pair is formed by sleeve one and sleeve two, axial stable folding of dust cover is constrained, axial movement and end rolling during dust cover folding process are avoided, mechanical limiting is formed in the dust cover folding process by clamping groove and clamping rod, further avoid dust cover excessive displacement or structural failure, significantly reduce the risk of falling off, ensure that shock absorber core area is long-term sealed and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of rail transit vehicle engineering, and in particular relates to an axial limiting structure for a dust cover of a shock absorber for an anti-detachment EMU train. Background Technology

[0002] With the rapid development of high-speed railways in my country, the operating speed of EMU trains continues to increase, and the dynamic loads and environmental stresses borne by the bogies are becoming increasingly severe. As the core damping element of the bogie, the shock absorber plays a crucial role in attenuating wheel-rail impact, suppressing car body vibration, and ensuring operational stability and safety. To prevent contaminants such as sand, rain, snow, and oil from entering the internal moving parts, flexible dust covers are generally fitted on the outside of the shock absorber piston rod to protect the sealing structure, extend service life, and maintain stable and reliable damping performance.

[0003] However, under high-frequency vibration and long-term fatigue conditions, the dust cover is prone to axial movement and end roll-up. If this phenomenon persists, it will lead to fatigue loosening and material creep at the connection points, which may eventually cause the dust cover to fall off completely. Once the dust cover loses its protective function, pollutants in the external environment will directly invade the core area of ​​the shock absorber, causing piston rod corrosion, seal wear, and hydraulic oil leakage. This will lead to continuous attenuation of damping force and drift in dynamic response characteristics, resulting in a decrease in the vehicle body's vibration suppression capability and deterioration of running stability, which seriously threatens the structural safety of the EMU.

[0004] Therefore, there is a particular need for an axial limiting structure for the dust cover of the anti-derailment EMU shock absorber to solve the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of dust covers being prone to axial movement and end roll-up under high-frequency vibration and long-term fatigue conditions, which can lead to detachment and failure, allowing contaminants to enter the shock absorber, causing damping performance degradation and operational stability deterioration, and endangering driving safety, this utility model provides an axial limiting structure for dust covers of train shock absorbers that prevents detachment.

[0006] This utility model is achieved through the following technical approach: an axial limiting structure for a dust cover of a shock absorber in a high-speed train, comprising a connecting frame, a mounting frame, a limiting plate 1, fixing bolts, a shock absorber, a limiting plate 2, a dust cover, a sleeve 1, a sleeve 2, and a clamping rod. Two limiting plates 1 are installed on each side of the upper part of the connecting frame via multiple fixing bolts, for a total of four limiting plates 1. A sleeve 1 is vertically fixed to the bottom of each limiting plate 1, and a sleeve 2 is slidably fitted onto the outside of each sleeve 1. A limiting plate 2 is fixed to the bottom of each sleeve 2. The number and structure of the limiting plates 2 are the same as those of the limiting plates 1. Multiple fixing bolts connect adjacent limiting plates 2. The bolt is equipped with two mounting brackets. Each limiting plate 1 has a circular limiting groove at its bottom and each limiting plate 2 has a circular limiting groove at its top. A shock absorber is placed between the vertically aligned limiting plate 1 and limiting plate 2. The fixed end of the shock absorber is embedded in the limiting groove of the lower limiting plate 2, and the movable end is embedded in the limiting groove of the upper limiting plate 1. A flexible dust cover is fixed between the vertically aligned and slidably connected sleeve 1 and sleeve 2. The dust cover covers the corresponding shock absorber. Each dust cover has multiple locking grooves on its outer wall. Multiple locking rods arranged in a ring array are fixed inside one end of each sleeve 2. The positions of the locking rods correspond to the locking grooves.

[0007] Optionally, it also includes a positioning plate, with a slot provided at the center of each limiting plate 1 and each limiting plate 2. The bottom of the fixed end and the top of the movable end of each shock absorber are fixedly connected to a positioning plate, wherein the positioning plate on the fixed end is inserted into the slot of the lower limiting plate 2, and the positioning plate on the movable end is inserted into the slot of the upper limiting plate 1.

[0008] Optionally, the shock absorber is a hydraulically damped shock absorber.

[0009] Optionally, both the slot and the mounting plate have a regular hexagonal cross-sectional shape.

[0010] Optionally, the card slot and the card slot plate have the same thickness.

[0011] Alternatively, the dust cover may be made of thermoplastic polyester elastomer.

[0012] Beneficial effects: 1. The sliding pair formed by sleeve one and sleeve two constrains the dust cover to fold smoothly along the axial direction, avoiding axial movement and end roll-up during the folding process. The locking groove and locking rod form a mechanical limit during the folding process of the dust cover, further preventing excessive displacement or structural failure of the dust cover, significantly reducing the risk of falling off, and ensuring long-term reliable sealing of the core area of ​​the shock absorber.

[0013] 2. By setting up a locking plate and a locking slot, the shock absorber is positioned and circumferentially anti-rotation is achieved between the first limiting plate and the second limiting plate, ensuring that the moving end of the shock absorber always moves smoothly along the axis and improving the working reliability of the shock absorber. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the connecting frame, mounting frame, and limiting plate of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the mounting bracket, limiting plate, and fixing bolt of this utility model.

[0017] Figure 4 This is a partial sectional view of the mounting bracket, sleeve one, and sleeve two components of this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of the components of this utility model, including the limiting disc one, the fixing bolt, and the limiting disc two.

[0019] Figure 6 This is a partial cross-sectional view of the limiting disk one and limiting disk two components of this utility model.

[0020] Attached reference numerals: 1. Connecting bracket, 2. Mounting bracket, 3. Limiting plate one, 301. Limiting groove, 302. Slot, 4. Fixing bolt, 5. Shock absorber, 6. Limiting plate two, 7. Slotting plate, 8. Dust cover, 801. Slotting groove, 9. Sleeve one, 10. Sleeve two, 11. Locking rod. Detailed Implementation

[0021] Example: An axial limiting structure for the dust cover of a shock absorber in a high-speed train, such as... Figures 1-6As shown, the device includes a connecting frame 1, a mounting frame 2, a first limiting plate 3, fixing bolts 4, a shock absorber 5, a second limiting plate 6, a dust cover 8, a first sleeve 9, a second sleeve 10, and a clamping rod 11. The connecting frame 1 has four first limiting plates 3 fixed to its upper left and right sides by multiple fixing bolts 4. Each first limiting plate 3 has a first sleeve 9 fixedly connected to its bottom. Each second sleeve 9 has a second sleeve 10 slidably fitted onto its exterior. Each second sleeve 10 has a second limiting plate 6 fixedly connected to its bottom. The number and structure of the second limiting plates 6 are the same as those of the first limiting plates 3. Two mounting frames 2 are fixed between adjacent second limiting plates 6 by multiple fixing bolts 4. Each first limiting plate 3 has a circular limiting groove 301 at its bottom and each second limiting plate 6 has a circular limiting groove 301 at its top. A shock absorber 5 is placed between the vertically aligned first limiting plates 3 and second limiting plates 6. The fixed end of the shock absorber 5 is embedded in the limiting groove of the lower second limiting plate 6. In groove 301, the movable end is embedded in the limiting groove 301 of the upper limiting plate 3. The shock absorber 5 is a hydraulic damping shock absorber. A flexible dust cover 8 is fixedly connected between the vertically aligned and slidably connected sleeve 1 9 and sleeve 2 10. The dust cover 8 covers the corresponding shock absorber 5. The dust cover 8 is made of thermoplastic polyester elastomer material, which has excellent cold resistance, oil resistance, UV aging resistance and high elastic recovery ability. Multiple locking grooves 801 are opened on the outer wall of each dust cover 8. Four locking rods 11 arranged in a ring array are fixedly connected inside the lower end of each sleeve 2 10. The position of the locking rods 11 corresponds to the locking grooves 801. When the sleeve 1 9 slides down, the dust cover 8 folds axially. The locking grooves 801 move down with the dust cover 8 and contact the locking rods 11. The locking rods 11 are embedded in the locking grooves 801 to form a mechanical limit, thereby preventing the dust cover 8 from axially moving and the end from rolling up when folding.

[0022] like Figure 4 , Figure 5 and Figure 6 As shown, it also includes a positioning plate 7. Each limiting plate 1 3 and each limiting plate 2 6 has a slot 302 at its center. The bottom of the fixed end and the top of the movable end of each shock absorber 5 are fixedly connected to the positioning plate 7. The positioning plate 7 on the fixed end is inserted into the slot 302 of the lower limiting plate 2 6, and the positioning plate 7 on the movable end is inserted into the slot 302 of the upper limiting plate 1 3. The cross-sectional shape of the slot 302 and the positioning plate 7 is a regular hexagon, which not only facilitates the quick centering and positioning of the shock absorber 5 during assembly, but also effectively constrains the circumferential degree of freedom of the shock absorber 5 during operation, preventing the shock absorber 5 from twisting due to vibration or off-center load. The thickness of the slot 302 and the positioning plate 7 is equal.

[0023] In use, the connecting frame 1 is fixedly installed on the bogie frame of the EMU, and the mounting frame 2 is connected to the wheelset. When vibration occurs during the operation of the EMU, the vibration energy is transmitted to the movable end of the shock absorber 5 through the limiting disc 3, causing the movable end to axially retract relative to the fixed end, thereby achieving damping and energy absorption. At the same time, the limiting disc 3 drives the sleeve 9 to slide downward, while the sleeve 10 remains relatively stationary. The dust cover 8 then axially folds and retracts. During this process, the sleeve 9 and the sleeve 10 form a sliding pair, constraining the dust cover 8 to fold smoothly along the axial direction, effectively preventing the dust cover 8 from axially shifting or rolling over at the end during folding. Meanwhile, the locking groove 80 on the outer wall of the dust cover 8... 1. As the dust cover 8 folds and moves to the position corresponding to the locking rod 11, the locking rod 11 is embedded in the locking groove 801, forming a mechanical limit, further preventing the dust cover 8 from axial movement and end roll-up. When the vibration weakens and the shock absorber 5 returns to tension from the compressed state, the limiting plate 1 3 drives the sleeve 1 9 to slide upward, and the dust cover 8 unfolds upward. The locking rod 11 is smoothly disengaged from the locking groove 801. At the same time, the locking plates 7 of the fixed end and the movable end of the shock absorber 5 are always inserted into the locking grooves 302 of the limiting plate 2 6 and the limiting plate 1 3, ensuring that the shock absorber 5 does not deviate during axial movement and maintaining a stable cooperation relationship between the shock absorber 5 and the limiting plate 1 3 and the limiting plate 2 6.

Claims

1. An axial limiting structure for a dust cover of a shock absorber in a high-speed train, characterized in that, It includes a connecting frame (1), a mounting frame (2), a limiting plate one (3), a fixing bolt (4), a shock absorber (5), a limiting plate two (6), a dust cover (8), a sleeve one (9), a sleeve two (10), and a clamping rod (11). The upper sides of the connecting frame (1) are equipped with two limiting plates one (3) through multiple fixing bolts (4), for a total of four limiting plates one (3). Each limiting plate one (3) has a sleeve one (9) vertically fixed to its bottom. Each sleeve one (9) has a sleeve two (10) slidably fitted on its outside. Each sleeve two (10) has a limiting plate two (6) fixed to its bottom. The number of limiting plates two (6) is the same as that of limiting plates one (3) and they have the same structure. There are two mounting frames (2) between two adjacent limiting plates two (6) through multiple fixing bolts (4). Each limiting disc 1 (3) has a limiting groove (301) at the bottom and each limiting disc 2 (6) has a limiting groove (301) at the top. A shock absorber (5) is placed between the vertically aligned limiting disc 1 (3) and the limiting disc 2 (6). The fixed end of the shock absorber (5) is embedded in the limiting groove (301) of the lower limiting disc 2 (6), and the movable end is embedded in the limiting groove (301) of the upper limiting disc 1 (3). A flexible dust cover (8) is fixed between the vertically aligned and slidably connected sleeve 1 (9) and sleeve 2 (10). The dust cover (8) covers the corresponding shock absorber (5). Each dust cover (8) has multiple locking grooves (801) on its outer wall. Each sleeve 2 (10) has multiple locking rods (11) arranged in a ring array fixed inside one end. The position of the locking rods (11) corresponds to the locking groove (801).

2. The axial limiting structure for the dust cover of the anti-derailment EMU shock absorber according to claim 1, characterized in that, It also includes a positioning plate (7), and a slot (302) is provided at the center of each limiting plate one (3) and each limiting plate two (6). The bottom of the fixed end and the top of the movable end of each shock absorber (5) are fixedly connected to the positioning plate (7). The positioning plate (7) on the fixed end is inserted into the slot (302) of the lower limiting plate two (6), and the positioning plate (7) on the movable end is inserted into the slot (302) of the upper limiting plate one (3).

3. The axial limiting structure for the dust cover of the anti-derailment EMU shock absorber according to claim 2, characterized in that, The shock absorber (5) is a hydraulic damping shock absorber.

4. The axial limiting structure for the dust cover of the anti-derailment EMU shock absorber according to claim 3, characterized in that, Both the slot (302) and the mounting plate (7) have a regular hexagonal cross-sectional shape.

5. The axial limiting structure for the dust cover of the anti-derailment EMU shock absorber according to claim 4, characterized in that, The card slot (302) and the card plate (7) have the same thickness.

6. The axial limiting structure for the dust cover of the anti-derailment EMU shock absorber according to claim 5, characterized in that, The dust cover (8) is made of thermoplastic polyester elastomer material.

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