Split type single-cylinder shock absorber with nitrogen bag
By introducing a nitrogen pack split structure and heat dissipation device into the monotube shock absorber, the problems of poor heat dissipation and limited travel are solved, achieving more efficient heat dissipation and better ride comfort.
Patent Information
- Application Number
- CN202422655575.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Existing monotube shock absorbers have poor heat dissipation effect and limited movement range when used at high speeds, resulting in insufficient ride comfort.
A split structure with a nitrogen bag is adopted, the floating piston and the air chamber are transferred to the nitrogen bag, and a heat dissipation device is set on the outside of the cylinder, including heat sinks and heat pipes, which uses the evaporation and condensation principle of the liquid working medium to improve the heat dissipation efficiency.
The heat dissipation performance and movement range of the shock absorber are improved, the high-temperature failure rate is reduced, and the ride comfort is improved.
Smart Images
Figure CN223331023U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shock absorbers, in particular to a split-type monotube shock absorber with a nitrogen bag. Background Art
[0002] Shock absorbers are mainly used to suppress the vibration caused by the rebound of the spring after shock absorption and the impact from the road. When passing through uneven roads, although the shock-absorbing spring can filter out the vibration of the road, the spring itself will still have reciprocating motion, and the shock absorber is used to suppress this spring jump. The shock absorbers produced domestically mainly include spring hydraulic, oil-gas mixed spring shock absorbers and pneumatic shock absorbers. The first two are characterized by the mixing of oil and gas in the same studio, and the pneumatic shock absorber is based on the first two and is filled with high-pressure gas.
[0003] The common monotube shock absorbers on the market now have a structure reference to the instructions attached. Figure 1 Compared to twin-tube shock absorbers, this design has improved heat dissipation to a certain extent, and uses a floating piston to separate oil and gas, effectively reducing foaming caused by the shock absorber oil and low-pressure nitrogen. However, this oil-gas separation inevitably results in the lower air chamber occupying a certain amount of space, which limits the upper end's travel. Furthermore, due to the limited length of the shock absorber, the oil volume inside is not particularly large. As a result, although the heat dissipation effect is improved compared to twin-tube shock absorbers, the heat dissipation and travel are insufficient for use in aggressive driving and high-speed conditions. Therefore, the customer requested an optimization of this structure.
[0004] For this reason, a split monotube shock absorber with a nitrogen bag is proposed to solve the above-mentioned problems. Utility Model Content
[0005] In order to overcome the deficiencies of the prior art, the utility model provides a split-type monotube shock absorber with a nitrogen bag.
[0006] The utility model is implemented by the following technical solutions:
[0007] A split-type monotube shock absorber with a nitrogen bag comprises a barrel and a top cover. The barrel is cylindrical with a hollow interior and an open top. The top cover is fixed to the front end of the barrel. A piston rod is provided inside the barrel, which passes through the barrel. A shock absorber piston is provided at the end of the piston rod. The shock absorber piston is arranged in the barrel. A heat dissipation device is provided on the outside of the barrel. The heat dissipation device comprises a plurality of heat dissipation fins, which are arranged along the circumference of the axis of the barrel and evenly fixed on the outer wall of the barrel. Heat pipes are provided between the heat dissipation fins. Liquid storage rings are provided at the ends of the heat pipes. The liquid storage rings are sleeved on the barrel. The ends of the plurality of heat pipes are connected to the liquid storage rings.
[0008] A nitrogen bag is provided on the side of the cylinder body, the nitrogen bag is filled with nitrogen, a floating piston is provided inside the nitrogen bag, an air bag guide is provided at the end of the nitrogen bag, a high-pressure oil pipe is provided on the outer wall of the air bag guide, an oil pipe joint is provided at the end of the high-pressure oil pipe, an oil circuit interface is provided on the side wall of the cylinder body away from the top cover, and the nitrogen bag is connected to the cylinder body through the high-pressure oil pipe.
[0009] The bottom of the nitrogen bag is provided with an air filling valve port and a pressure relief valve.
[0010] A guide assembly is provided at one end of the cylinder body close to the top cover, and the guide assembly is engaged in the cylinder body. A buffer pad is provided on the side wall of the guide, and the buffer is fixed on the side wall of the guide.
[0011] Sealing rings are provided on the outer peripheral walls of the guide assembly, the shock absorber piston and the floating piston.
[0012] An upper lifting ring assembly is provided at one end of the piston rod close to the top cover, the upper lifting ring assembly is fixedly connected to the piston rod, and an upper rubber sleeve is provided in the upper lifting ring assembly;
[0013] A lower rubber sleeve is provided at one end of the barrel away from the top cover, and the lower rubber sleeve is fixedly connected to the barrel.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. By providing a heat dissipation device on the outside of the barrel, which includes multiple heat sinks, this design can effectively increase the heat dissipation area of the outer surface of the barrel and improve the heat dissipation efficiency;
[0016] 2. Furthermore, by arranging heat pipes between the heat sinks, and providing liquid storage rings at the ends of the heat pipes, the ends of the multiple heat pipes are connected to the liquid storage rings. The heat pipes utilize the evaporation and condensation principle of the liquid working medium to quickly transfer the heat inside the cylinder to the heat sink and dissipate it into the air, further improving the heat dissipation performance.
[0017] 3. By using a high-pressure oil pipe to connect the nitrogen bag and the shock absorber, the ordinary monotube shock absorber is changed to a split monotube shock absorber with a nitrogen bag, and the floating piston and the air chamber are transferred to the nitrogen bag, the internal shock absorber oil and the movement stroke are increased. This structural design reduces the problem of high-temperature failure. In addition, the transfer of the floating piston and the air chamber leads to an increase in the internal stroke, which improves ride comfort. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is the internal structure of a common monotube shock absorber in the prior art;
[0019] Figure 2 This is a schematic diagram of the internal oil chamber and air chamber distribution structure of the utility model;
[0020] Figure 3 It is a schematic diagram of the internal structure of the utility model;
[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the outer part of the barrel of the utility model;
[0022] Figure 5 This is a schematic diagram of the exploded three-dimensional structure of part of the outer shell of the utility model;
[0023] In the figure: 1. Upper rubber sleeve; 2. Upper lifting ring assembly; 3. Guide assembly; 4. Buffer pad; 5. Piston rod; 6. Floating piston; 61. Sealing ring; 7. Nitrogen bag; 71. Charging valve port; 72. Pressure relief valve; 8. Air bag guide; 9. High-pressure oil pipe; 10. Shock absorber piston; 11. Lower rubber sleeve; 12. Oil pipe joint; 13. Oil line interface; 14. Cylinder body; 141. Heat sink; 142. Liquid storage ring; 143. Heat pipe. DETAILED DESCRIPTION
[0024] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0025] The present invention will be further described below with reference to the accompanying drawings.
[0026] like Figures 1 to 5 As shown, a split single-tube shock absorber with a nitrogen bag 7 includes a barrel 14 and a top cover. The barrel 14 is a cylindrical body with a hollow interior and an open top. The barrel 14 serves as the main structure of the shock absorber. It is hollow inside and has an open top, and is used to accommodate a piston rod 5 and shock-absorbing oil. The barrel 14 is usually made of high-strength alloy material to withstand the impact and vibration of the vehicle during driving. The top cover is fixed to the front end of the barrel 14. The top cover is set and fixed to the front end of the barrel 14 to close the opening of the barrel 14 and serve as a channel for the piston rod 5 to pass through. The top cover and the barrel 14 are usually threaded or welded to ensure sealing. A piston rod 5 is provided inside the cylinder body 14, and the piston rod 5 is passed through the cylinder body 14. A shock absorber piston 10 is provided at the end of the piston rod 5, and the shock absorber piston 10 is provided in the cylinder body 14. The shock absorber piston 10 is connected to the piston rod 5. A plurality of throttle holes and valves are provided on the piston for controlling the flow speed and direction of the shock absorber oil, thereby achieving a shock absorption effect.
[0027] A heat dissipation device is provided on the outside of the barrel 14, and the heat dissipation device includes a plurality of heat sinks 141. The heat sinks 141 are made of a metal material with good thermal conductivity, such as aluminum alloy or copper alloy, and are used to transfer the heat inside the barrel 14 to the air. The heat sinks 141 are arranged along the axial circumference of the barrel 14 and are evenly fixed on the outer wall of the barrel 14. Heat pipes 143 are provided between the heat sinks 141. The heat pipes 143 are arranged between the heat sinks 141 and contact the side walls of the heat sinks 141. The heat inside the barrel 14 is quickly transferred to the heat sinks 141 by utilizing the evaporation and condensation principle of the liquid working medium. One end of the heat pipe 143 contacts the inside of the barrel 14, and the other end contacts the heat sink 141, forming an efficient heat conduction channel. The end of the heat pipe 143 is provided with a liquid storage ring 142, which is sleeved on the barrel 14. The liquid storage ring 142 is filled with the liquid working medium required for the operation of the heat pipe 143 to ensure the stability and reliability of the heat pipe 143 during operation. The ends of multiple heat pipes 143 are connected to the liquid storage ring 142.
[0028] A nitrogen bag 7 is provided on the side of the cylinder body 14 to provide additional shock-absorbing support. The nitrogen bag 7 is filled with nitrogen. A floating piston 6 is provided inside the nitrogen bag 7 to adjust the nitrogen pressure according to the shock-absorbing requirements. An air bag guide 8 is provided at the end of the nitrogen bag 7. A high-pressure oil pipe 9 is provided on the outer wall of the air bag guide 8. An oil pipe joint 12 is provided at the end of the high-pressure oil pipe 9. An oil circuit interface 13 is provided on the side wall of the cylinder body 14 away from the top cover. The nitrogen bag 7 is connected to the cylinder body 14 through the high-pressure oil pipe 9 to achieve the synergistic effect of nitrogen and shock-absorbing oil.
[0029] The bottom of the nitrogen bag 7 is provided with an inflation valve port 71 and a pressure relief valve 72, which facilitates inflation and pressure regulation of the nitrogen bag 7 and ensures safe pressure relief in abnormally high pressure conditions.
[0030] A guide assembly 3 is provided at one end of the cylinder body 14 close to the top cover. The guide assembly 3 is engaged in the cylinder body 14 to guide the smooth movement of the piston rod 5. A buffer pad 4 is provided on the side wall of the guide to absorb part of the impact energy and improve the shock absorption effect. The buffer is fixed on the side wall of the guide to ensure stability and durability under long-term use.
[0031] A sealing ring 61 is provided on the outer peripheral wall of the guide assembly 3, the shock absorber piston 10 and the floating piston 6 to ensure the sealing between the components, prevent oil leakage, and improve the overall performance of the shock absorber.
[0032] An upper lifting ring assembly 2 is provided at one end of the piston rod 5 close to the top cover. The upper lifting ring assembly 2 is fixedly connected to the piston rod 5. An upper rubber sleeve 1 is provided inside the upper lifting ring assembly 2. The upper lifting ring assembly 2 facilitates the installation of the shock absorber on the vehicle, and the upper rubber sleeve 1 is used to reduce the noise and impact transmitted by vibration to the vehicle body.
[0033] A lower rubber sleeve 11 is provided at one end of the barrel body 14 away from the top cover. The lower rubber sleeve 11 is fixedly connected to the barrel body 14 and also plays a role in reducing vibration and noise.
[0034] The operating principle of the present invention is as follows: initially, the shock absorber is in a stationary state, the piston rod 5 is not subjected to external force, the shock absorber piston 10 is located in a neutral position inside the cylinder 14, the nitrogen bag 7 is filled with high-pressure nitrogen, and is connected to the oil circuit interface 13 inside the cylinder 14 through the high-pressure oil pipe 9, the heat dissipation device is in a standby state, and the heat pipe 143 and the heat sink 141 do not start working;
[0035] When the vehicle travels on an uneven road, the wheel is impacted and moves upward, which is transmitted to the shock absorber through the suspension system. The piston rod 5 is acted upon by an external force, driving the shock absorber piston 10 to move upward inside the cylinder 14. The movement of the shock absorber piston 10 forces the hydraulic oil to flow from the hydraulic oil chamber into the nitrogen chamber through the orifice and valve.
[0036] At the same time, the nitrogen in the nitrogen bag 7 is compressed and the pressure increases, and the pressure is transmitted to the oil circuit interface 13 inside the barrel 14 through the high-pressure oil pipe 9, further enhancing the shock absorption effect;
[0037] When the wheel leaves the uneven road surface, the suspension system begins to rebound, and the shock absorber piston 10 moves downward inside the cylinder 14. At this time, the nitrogen in the nitrogen bag 7 quickly releases pressure, pushing the hydraulic oil back to the hydraulic oil chamber through the throttle hole and valve. The movement speed of the shock absorber piston 10 is controlled by the throttle hole and valve, achieving a smooth rebound process;
[0038] During the operation of the shock absorber, a large amount of heat is generated due to the compression and release of hydraulic oil and nitrogen. This heat is transferred to the heat dissipation device through the cylinder 14, and the heat sink 141 dissipates the heat into the air. At the same time, the heat pipe 143 uses the evaporation and condensation principle of the liquid working medium to quickly transfer the heat inside the cylinder 14 to the heat sink 141, further improving the heat dissipation efficiency.
[0039] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.
Claims
1. A split-type mono-tube shock absorber with a nitrogen bag, comprising a barrel (14) and a top cover, wherein the barrel (14) is a cylindrical body with a hollow interior and an open top, the top cover is fixed to the front end of the barrel (14), a piston rod (5) is provided inside the barrel (14), the piston rod (5) is passed through the barrel (14), a shock absorber piston (10) is provided at the end of the piston rod (5), and the shock absorber piston (10) is provided in the barrel (14), characterized in that: A heat dissipation device is provided on the outside of the barrel (14), and the heat dissipation device comprises a plurality of heat dissipation fins (141). The heat dissipation fins (141) are arranged along the circumference of the axis of the barrel (14) and are evenly fixed on the outer wall of the barrel (14). Heat pipes (143) are provided between the heat dissipation fins (141). The ends of the heat pipes (143) are provided with liquid storage rings (142). The liquid storage rings (142) are sleeved on the barrel (14), and the ends of the plurality of heat pipes (143) are connected to the liquid storage rings (142).
2. The split-type monotube shock absorber with nitrogen bag according to claim 1, characterized in that: A nitrogen bag (7) is provided on the side of the cylinder body (14), the interior of the nitrogen bag (7) is filled with nitrogen, a floating piston (6) is provided inside the nitrogen bag (7), an air bag guide (8) is provided at the end of the nitrogen bag (7), a high-pressure oil pipe (9) is provided on the outer wall of the air bag guide (8), an oil pipe joint (12) is provided at the end of the high-pressure oil pipe (9), an oil circuit interface (13) is provided on the side wall of the cylinder body (14) away from the top cover, and the nitrogen bag (7) is connected to the cylinder body (14) through the high-pressure oil pipe (9).
3. The split-type monotube shock absorber with nitrogen bag according to claim 2, characterized in that: The bottom of the nitrogen bag (7) is provided with an air filling valve port (71) and a pressure relief valve (72).
4. The split-type monotube shock absorber with nitrogen bag according to claim 3, characterized in that: A guide assembly (3) is provided at one end of the cylinder body (14) close to the top cover, and the guide assembly (3) is engaged with the inside of the cylinder body (14). A buffer pad (4) is provided on the side wall of the guide, and the buffer pad (4) is fixed on the side wall of the guide.
5. The split-type monotube shock absorber with nitrogen bag according to claim 4, characterized in that: Sealing rings (61) are provided on the outer peripheral walls of the guide assembly (3), the shock absorber piston (10) and the floating piston (6).
6. The split-type monotube shock absorber with nitrogen bag according to claim 5, characterized in that: An upper lifting ring assembly (2) is provided at one end of the piston rod (5) close to the top cover, the upper lifting ring assembly (2) is fixedly connected to the piston rod (5), and an upper rubber sleeve (1) is provided inside the upper lifting ring assembly (2); A lower rubber sleeve (11) is provided at one end of the barrel (14) away from the top cover, and the lower rubber sleeve (11) is fixedly connected to the barrel (14).