A damping device for a semi-trailer

Abstract

The utility model relates to the technical field of semi -trailer damping device, concretely relates to a semi -trailer damping device, include: mounting panel, damping component, the damping component includes the fixed slide rail of symmetry fixed mounting on the end surface of mounting panel, the fixed slide rail is fixedly installed with first compression gas bag, the first compression gas bag is filled with chemical gas, the fixed slide rail is symmetrically installed with buffer gas bag, and the first compression gas bag is transported gas through the conveying pipe between buffer gas bag, the utility model discloses a second compression gas bag, return hose and the matched one-way valve (first one-way valve) are set up, and the closed loop gas passage that constructs from buffer gas bag to second compression gas bag through the flow guide pipe, return first compression gas bag again through return hose is established, in the vibration rebound stage, second compression gas bag is compressed, and the gas working substance stored in its inside is pressed back first compression gas bag and is reused.

Description

Technical Field

[0001] This utility model relates to the technical field of semi-trailer shock absorption devices, specifically to a shock absorption device for semi-trailers. Background Technology

[0002] A semi-trailer shock absorber is a device used to reduce vibrations and impacts generated during the operation of a semi-trailer, primarily to improve vehicle comfort, stability, and safety. It is typically installed in the semi-trailer's suspension system to absorb vibrations caused by uneven road surfaces or during driving, protecting the cargo and reducing damage to the vehicle's chassis and other components. For example, a semi-trailer shock absorber disclosed in patent CN215398063U can effectively cushion the swaying of the vehicle frame, providing good shock absorption.

[0003] However, traditional shock absorption systems generally use leaf spring structures, which, while providing basic cushioning, have significant drawbacks under heavy loads or complex road conditions: leaf springs rely on metal deformation to absorb energy, and long-term exposure to high-frequency impacts can easily lead to fatigue fractures, resulting in high maintenance costs; single leaf springs have limited shock absorption stroke and insufficient attenuation of vertical vibrations, making the vehicle body prone to rigid bumps and increasing the risk of cargo damage. In recent years, some improvement solutions have introduced airbag shock absorption technology, which disperses impact force through gas compression, but existing airbag structures still have bottlenecks: for example, the gas in the airbag is released in one direction after being compressed and cannot be recycled, resulting in a decrease in continuous shock absorption capacity; at the same time, the air circuit system lacks a pressure gradient design, and the airbag rebound response is delayed, making it difficult to cope with continuous bumpy conditions. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a shock absorption device for semi-trailers, which can effectively solve the bottleneck of the existing airbag structure: for example, the gas is released in one direction after the airbag is compressed and cannot be recycled, resulting in the continuous reduction of shock absorption capacity.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a shock absorption device for semi-trailers, comprising:

[0007] Mounting plate;

[0008] The shock absorption assembly includes a fixed slide rail symmetrically fixedly mounted on the upper surface of the mounting plate, a first compressed air bladder fixedly mounted inside the fixed slide rail, the first compressed air bladder being filled with chemical gas, and a buffer air bladder symmetrically mounted inside the fixed slide rail, with gas being supplied between the first compressed air bladder and the buffer air bladder through a delivery pipe.

[0009] A recirculation assembly, the recirculation assembly including a second compressed air bladder disposed on the upper end face of the mounting plate.

[0010] Preferably, a fixing rod is fixedly installed inside the first compressed air bag, and a sliding sleeve is sleeved on the outer wall of the fixing rod. The upper end of the sliding sleeve passes through the first compressed air bag and is fixedly installed with a fixing plate.

[0011] Preferably, a first spring is fixedly installed on the inner wall of the first compressed airbag and on the outer wall of the sliding sleeve, and external blocks are symmetrically installed on the outer wall of the sliding sleeve.

[0012] Preferably, the inner wall of the fixed slide rail is symmetrically slidably mounted with sliders, a bracket is rotatably mounted between the sliders and the outer block, and one side of the slider is fixedly connected to the buffer airbag.

[0013] Preferably, a fixing plate is fixedly installed on the upper end face of the mounting plate, a linkage plate is fixedly installed on the outer wall of the first compressed air bag, and a second compressed air bag is fixedly installed between the fixing plate and the linkage plate.

[0014] Preferably, the upper end of the second compression airbag is connected to a return hose, and a first one-way valve is fixedly installed inside the return hose. The upper end of the return hose passes through the fixing plate and the linkage plate and is connected to the first compression airbag. One end of the buffer airbag is connected to a guide pipe, and one end of the guide pipe passes through the fixing slide rail and the linkage plate and is connected to the second compression airbag. A second one-way valve is fixedly installed inside the guide pipe, and the inner diameter of the guide pipe is smaller than the inner diameter of the delivery pipe.

[0015] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0016] 1. By setting up a second compression airbag, a return hose, and a matching one-way valve (first one-way valve), a closed-loop gas path is constructed, from the buffer airbag through the guide pipe to the second compression airbag, and then back to the first compression airbag through the return hose. During the vibration rebound stage, the second compression airbag is compressed, and the gaseous working medium stored inside is pushed back into the first compression airbag for reuse. This design effectively avoids the problem of reduced shock absorption capacity after one-way gas release in traditional airbag shock absorption, ensuring that the device can still provide a long-lasting and stable shock absorption effect under continuous bumpy conditions.

[0017] 2. By utilizing the design where the inner diameter of the delivery pipe is larger than that of the guide pipe, when the first compression airbag is compressed, the gas preferentially enters the buffer airbag quickly through the large-diameter delivery pipe to provide immediate cushioning. At the same time, some gas slowly flows into the second compression airbag through the small-diameter guide pipe for temporary storage. This pressure gradient design allows the buffer airbag to maintain a certain expansion support force when squeezed by the slider (because the internal gas is discharged slowly). Combined with the linkage plate driving the extension and contraction of the second compression airbag and the precise control of the one-way valve, the rebound response speed of the airbag system is significantly improved, enabling it to more effectively cope with complex road conditions such as heavy loads and continuous bumps, and reduce the rigid impact on the carriage. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is an exploded structural diagram of the shock absorption component of this utility model;

[0021] Figure 3 This is an exploded structural diagram of the first compression airbag of this utility model;

[0022] Figure 4 This is an exploded structural diagram of the linkage plate of this utility model.

[0023] Reference numerals: 1. Mounting plate; 2. Shock absorption assembly; 201. Fixed slide rail; 202. First compression airbag; 203. Fixed rod; 204. Sliding sleeve; 205. First spring; 206. External block; 207. Fixed plate; 208. Bracket; 209. Slider; 210. Buffer airbag; 211. Conveying pipe; 3. Return assembly; 301. Linkage plate; 302. Second compression airbag; 303. Fixed plate; 304. Return hose; 305. Guide pipe. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] The present invention will be further described below with reference to the embodiments.

[0026] Example: Refer to Figures 1 to 4 A shock absorber for semi-trailers, comprising:

[0027] Mounting plate 1;

[0028] The shock absorption assembly 2 includes a fixed slide rail 201 symmetrically fixedly installed on the upper surface of the mounting plate 1. A first compression airbag 202 is fixedly installed inside the fixed slide rail 201. The first compression airbag 202 is filled with a chemical gas (preferably nitrogen, which is an inert gas with stable chemical properties and hardly reacts with the rubber airbag, metal parts or shock absorption oil, effectively preventing oxidation and corrosion). Buffer airbags 210 are symmetrically installed inside the fixed slide rail 201. Gas is supplied between the first compression airbag 202 and the buffer airbag 210 through a delivery pipe 211.

[0029] The return assembly 3 includes a second compression airbag 302 disposed on the upper surface of the mounting plate 1. When the semi-trailer travels to a bumpy section of road, the cargo box presses down on the fixing plate 207. The fixing plate 207 drives the sliding sleeve 204 to move down along the fixing rod 203. The sliding sleeve 204 compresses the first compression airbag 202. The chemical gas inside the airbag is rapidly injected into the buffer airbags 210 on both sides through the large-diameter delivery pipe 211, causing the airbag to expand instantly. The sliding sleeve 204 moves down, causing the outer block 206 to press down and push the bracket 208 to rotate. The two ends of the bracket 208 force the slider 209 to slide outward along the fixed slide rail 201, actively compressing the expanded buffer airbag 210 and converting the vertical impact into airbag deformation energy.

[0030] A fixing rod 203 is fixedly installed inside the first compressed airbag 202. A sliding sleeve 204 is sleeved on the outer wall of the fixing rod 203. The upper end of the sliding sleeve 204 passes through the first compressed airbag 202 and is fixedly installed with a fixing piece 207.

[0031] A first spring 205 is fixedly installed on the inner wall of the first compressed air bag 202 and on the outer wall of the sliding sleeve 204. External blocks 206 are symmetrically installed on the outer wall of the sliding sleeve 204.

[0032] A slider 209 is symmetrically slidably installed on the inner wall of the fixed slide rail 201. A bracket 208 is rotatably installed between the slider 209 and the outer block 206. One side of the slider 209 is fixedly connected to the buffer airbag 210. When the buffer airbag 210 is compressed, the internal gas flows slowly into the second compression airbag 302 through the small-diameter guide pipe 305 (due to its small inner diameter and slow flow rate). The inner diameter of the delivery pipe 211 is greater than the inner diameter of the guide pipe 305. Therefore, the buffer airbag 210 maintains a high air pressure in the early stage of compression, which slows down the contraction speed and avoids rigid impact.

[0033] A fixing plate 303 is fixedly installed on the upper end face of the mounting plate 1, a linkage plate 301 is fixedly installed on the outer wall of the first compressed air bag 202, and a second compressed air bag 302 is fixedly installed between the fixing plate 303 and the linkage plate 301.

[0034] The upper end of the second compression airbag 302 is connected to a return hose 304, and a first one-way valve is fixedly installed inside the return hose 304. The upper end of the return hose 304 passes through the fixing plate 303 and the linkage plate 301 and is connected to the first compression airbag 202. One end of the buffer airbag 210 is connected to a guide pipe 305, and one end of the guide pipe 305 passes through the fixing slide rail 201 and the linkage plate 301 and is connected to the second compression airbag 302. A second one-way valve is fixedly installed inside the guide pipe 305. The inner diameter of the guide pipe 305 is smaller than that of the delivery pipe 211. The first compression airbag 202 rebounds, pushing the linkage plate 301 to move upward and compress the second compression airbag 302. At this time, the second one-way valve closes to prevent gas backflow. The first one-way valve opens, and the gas temporarily stored in the second compression airbag 302 is pushed back to the first compression airbag 202 through the return hose 304. At the same time, the first spring 205 releases its elastic potential energy, assisting the sliding sleeve 204 to reset and completing the shock absorption cycle.

[0035] The working principle of this utility model is as follows:

[0036] By installing mounting plate 1 on the semi-trailer and mounting the cargo box onto the fixing plate 207, when bumps cause vibrations, the cargo box will drive the fixing plate 207 to descend. The descending fixing plate 207 will compress the first compression airbag 202 and drive the sliding sleeve 204 to slide down on the outer wall of the fixing rod 203. At the same time, it will compress the first spring 205. The chemical gas in the compressed first compression airbag 202 will be delivered into the buffer airbag 210 through the delivery pipe 211, causing the buffer airbag 210 to inflate. The descending sliding sleeve 204 will drive the outer block 206 and the bracket 208 to rotate, causing the two ends of the bracket 208 and the slider 209 to rotate and push the slider 209 to move backward to compress the buffer airbag 210 for cushioning, reducing the vibration of the cargo box caused by bumps. The chemical gas entering the buffer airbag 210 will continuously pass through the guide pipe 30 5. The chemical gas is delivered into the second compression bladder 302. Because the inner diameter of the delivery pipe 211 is larger than the inner diameter of the guide pipe 305, the chemical gas flowing into the buffer bladder 210 will generate a pressure difference, so that the buffer bladder 210 will still have an expansion effect when it is squeezed again. When the first compression bladder 202 is compressed, it will drive the linkage plate 301 to descend. The descending linkage plate 301 will stretch the second compression bladder 302. At this time, the second one-way valve opens and the first one-way valve closes. The chemical gas is delivered into the second compression bladder 302 through the delivery pipe 211. When the bumps disappear, the elastic first compression bladder 202 will drive the linkage plate 301 to rise and compress the second compression bladder 302. At this time, the second one-way valve closes and the first one-way valve opens. The chemical gas in the second compression bladder 302 flows back into the first compression bladder 202 through the return hose 304, and is used in this cycle.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shock-absorbing device for semi-trailers, characterized in that, include: Mounting plate (1); The shock absorption assembly (2) includes a fixed slide rail (201) symmetrically fixedly installed on the upper surface of the mounting plate (1), a first compression airbag (202) fixedly installed in the fixed slide rail (201), the first compression airbag (202) being filled with chemical gas, and a buffer airbag (210) symmetrically installed in the fixed slide rail (201). Gas is transported between the first compression airbag (202) and the buffer airbag (210) through a delivery pipe (211). The return assembly (3) includes a second compressed air bladder (302) disposed on the upper end face of the mounting plate (1).

2. The shock absorber for a semi-trailer according to claim 1, characterized in that, A fixing rod (203) is fixedly installed inside the first compressed air bag (202). A sliding sleeve (204) is sleeved on the outer wall of the fixing rod (203). The upper end of the sliding sleeve (204) passes through the first compressed air bag (202) and is fixedly installed with a fixing piece (207).

3. A shock absorber for a semi-trailer according to claim 1, characterized in that, A first spring (205) is fixedly installed on the inner wall of the first compressed airbag (202) and on the outer wall of the sliding sleeve (204), and an outer block (206) is symmetrically installed on the outer wall of the sliding sleeve (204).

4. A shock absorber for a semi-trailer according to claim 1, characterized in that, The inner wall of the fixed slide rail (201) is symmetrically slidably mounted with sliders (209), and a bracket (208) is rotatably mounted between the slider (209) and the outer block (206). One side of the slider (209) is fixedly connected to the buffer airbag (210).

5. A shock absorber for a semi-trailer according to claim 1, characterized in that, A fixing plate (303) is fixedly installed on the upper end face of the mounting plate (1), a linkage plate (301) is fixedly installed on the outer wall of the first compressed airbag (202), and a second compressed airbag (302) is fixedly installed between the fixing plate (303) and the linkage plate (301).

6. A shock absorber for a semi-trailer according to claim 5, characterized in that, The upper end of the second compression airbag (302) is connected to a return hose (304). A first one-way valve is fixedly installed inside the return hose (304). The upper end of the return hose (304) passes through the fixing plate (303) and the linkage plate (301) and is connected to the first compression airbag (202). One end of the buffer airbag (210) is connected to a guide pipe (305). One end of the guide pipe (305) passes through the fixing slide rail (201) and the linkage plate (301) and is connected to the second compression airbag (302). A second one-way valve is fixedly installed inside the guide pipe (305). The inner diameter of the guide pipe (305) is smaller than the inner diameter of the delivery pipe (211).

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