Oil gas spring with self-dispersing heat function

Abstract

The utility model relates to an oil gas spring with self -dispersion heat function relates to oil gas spring technical field, its structure includes oil gas spring body and with oil gas spring body parallelly arranged drive component. Oil gas spring body includes cylinder body I, hollow piston rod I and piston I, is provided with casing I on cylinder body I. Drive component includes cylinder body II, hollow piston rod II, piston II, hollow piston rod III, piston III, is provided with casing II on cylinder body II, cylinder body II is fixedly connected with cylinder body I, hollow piston rod II is fixedly established in cylinder body II, hollow piston rod III is fixedly connected with hollow piston rod I. Hollow piston rod I movement can drive hollow piston rod III movement, provides the power of hydraulic oil internal circulation and cooling water circulation, realizes the cooling of cooling water to hydraulic oil. Application can solve the technical problem that the temperature of oil gas spring is rapidly raised in continuous, high frequency reciprocating motion because of poor heat dissipation effect, leads to thermal recession, unstable performance and air pressure change.

Description

Technical Field

[0001] This invention relates to the field of gas spring technology, specifically a gas spring with self-driving heat dissipation function. Background Technology

[0002] Gas springs, with their nonlinear stiffness characteristics and excellent damping performance, are widely used in high-end passenger cars, heavy-duty commercial vehicles, and special engineering vehicles. Their working principle involves dissipating vibration energy through the throttling effect of hydraulic oil flowing through a damping valve system, thereby achieving vibration reduction. However, during continuous, high-frequency reciprocating motion, a large amount of dissipated mechanical energy is converted into heat energy, causing a sharp rise in the temperature of the hydraulic oil and the spring body. This leads to a series of problems: 1. Thermal fade: Increased hydraulic oil temperature causes a decrease in viscosity, resulting in reduced damping force and decreased vehicle handling stability and ride comfort; 2. Performance instability: High temperatures may affect the lifespan and performance of seals, even leading to seal failure and oil leakage; 3. Gas pressure changes: Increased temperature causes an increase in nitrogen pressure in the gas chamber, thereby altering the spring's stiffness characteristics.

[0003] In the prior art, such as the Chinese patent with publication number CN116221332A entitled "A Cylindrical Shock Absorber for Automobile Suspension", the solution is as follows: an oil reservoir is set below the sealed outer cylinder, and the inside of the oil reservoir is set with a downwardly recessed cavity. Cooling water is added to the outside of the oil reservoir, so that the cooling water continuously cools the hydraulic oil through the water bath, thereby reducing the tension of the hydraulic oil, further limiting the conditions for bubble generation, and avoiding cavitation of the hydraulic oil.

[0004] However, this type of solution is essentially a passive cooling method, whose cooling efficiency is limited by the external environment, and the cooling water lacks forced circulation. Under continuous high-intensity operating conditions, its cooling capacity quickly reaches a bottleneck, failing to remove core heat in time, thus resulting in poor performance. Summary of the Invention

[0005] The purpose of this invention is to provide a gas spring with self-driving heat dissipation function, which can solve the technical problems of thermal decay, performance instability and air pressure change caused by the rapid temperature rise during continuous, high-frequency reciprocating motion due to poor heat dissipation of gas springs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A hydropneumatic spring with self-driving heat dissipation function includes a hydropneumatic spring body and a drive assembly arranged in parallel with the hydropneumatic spring body.

[0008] The body of the gas spring includes a cylinder body I, a hollow piston rod I, and a piston I. The piston I is located at one end of the hollow piston rod I inside the cylinder body I and slides against the inner wall of the cylinder body I.

[0009] The inner cavity of the hollow piston rod I forms oil chamber I, and the hollow piston rod I, piston I and cylinder I form oil chamber II. The hollow piston rod I is provided with a damping hole that connects oil chamber I and oil chamber II.

[0010] A housing I is fitted onto the cylinder I, and a water cavity I is formed between the housing I and the cylinder I. The housing I is provided with a water inlet that connects to the water cavity I.

[0011] The drive assembly includes cylinder body II, hollow piston rod II, piston II, hollow piston rod III, and piston III. Cylinder body II is fixedly connected to cylinder body I. Hollow piston rod II is fixedly disposed inside cylinder body II. Hollow piston rod III is fixedly connected to hollow piston rod I and can slide back and forth with hollow piston rod I. One end of hollow piston rod III is located inside cylinder body II and is sleeved on hollow piston rod II. Piston III is disposed at the end of hollow piston rod III located inside cylinder body II and slides in cooperation with the inner wall of cylinder body II and the outer wall of hollow piston rod II. Piston II is disposed at the end of hollow piston rod II located inside hollow piston rod III and slides in cooperation with the inner wall of hollow piston rod III.

[0012] A housing 2 is fitted onto cylinder 2, and the housing 2 and cylinder 2 together form oil chamber 3. The inner cavity of hollow piston rod 2 forms oil chamber 4. The hollow piston rod 2, piston 2 and hollow piston rod 3, piston 3 together form oil chamber 5. The inner cavity of hollow piston rod 3 forms oil chamber 6. Oil chamber 3 is connected to oil chamber 2, and oil chamber 4 is connected to oil chamber 3. Hollow piston rod 2 is provided with a through hole connecting oil chamber 4 and oil chamber 5. Piston 2 is provided with a one-way valve structure that allows hydraulic oil to enter oil chamber 5 from oil chamber 6. Oil chamber 6 is connected to oil chamber 1.

[0013] The cylinder body II, hollow piston rod III, and piston III together form water chamber II. The inner cavity of cylinder body II forms water chamber III. Water chamber II is connected to water chamber I. Piston III is equipped with a one-way valve structure that allows cooling water to enter water chamber III from water chamber II. Cylinder body II is equipped with a water outlet that connects to water chamber III.

[0014] The reciprocating motion of hollow piston rod I relative to cylinder I drives the reciprocating motion of hollow piston rod III relative to cylinder II and hollow piston rod II, providing power for the internal circulation of hydraulic oil and the circulation of cooling water, thereby achieving the cooling of hydraulic oil by cooling water.

[0015] Furthermore, at the fixed connection between cylinder block I and cylinder block II, there is an oil passage I and a water passage I. The oil passage I is used to connect oil chamber II and oil chamber III, and the water passage I is used to connect water chamber I and water chamber II.

[0016] Furthermore, the hollow piston rod II is fixed inside the cylinder body II by an oil guide plate, and the oil guide plate is provided with an oil passage II for connecting the oil chamber III and the oil chamber IV.

[0017] Furthermore, the hollow piston rod Ⅲ is fixedly connected to the hollow piston rod Ⅰ via a connecting rod, and the connecting rod is provided with an oil passage Ⅲ for connecting oil chamber Ⅰ and oil chamber VI.

[0018] Furthermore, the inner wall of shell I is provided with multiple axially extending water guide strips, which are evenly distributed circumferentially on the inner wall of shell I to increase the flow path of cooling water in the annular water cavity I and improve the cooling effect.

[0019] Furthermore, the inner wall of housing II is provided with multiple circumferentially extending oil guide strips. The oil guide strips are C-shaped and are evenly distributed axially on the inner wall of housing II. The notches of adjacent oil guide strips are staggered to increase the flow path of hydraulic oil in annular oil cavity III and improve the cooling effect.

[0020] Furthermore, cylinder block I is provided with an air injection port.

[0021] Furthermore, the hollow piston rod I is provided with an oil injection port I.

[0022] Furthermore, the one-way valve structure on piston II includes gasket I, which allows hydraulic oil to flow unidirectionally from oil chamber VI into oil chamber V. The one-way valve structure on piston III includes gasket II, which allows cooling water to flow unidirectionally from water chamber II into water chamber III.

[0023] Furthermore, the connecting rod is equipped with an oil injection port II.

[0024] By adopting the above technical solution, the present invention has the following beneficial effects: 1. This invention innovatively utilizes the reciprocating motion of the gas spring itself as a power source to synchronously drive the forced circulation of internal oil and external cooling water, achieving efficient and self-driven heat exchange without the need for additional energy consumption, ensuring reliable operation, and fundamentally solving the heat dissipation problem of traditional gas springs. 2. This invention ensures the stability of oil viscosity, gas state and damping force through efficient active heat dissipation, thereby stabilizing the stiffness and damping characteristics of the gas spring and enabling the gas spring to maintain consistent performance under various working conditions. 3. This invention significantly reduces the operating temperature of the oil and seals, delays oil aging and seal failure, and greatly extends the overall service life and maintenance cycle of the gas spring. 4. When applied to a vehicle suspension system, this invention can maintain stable oil temperature under severe operating conditions, ensuring consistent response of the suspension system and thus significantly improving the vehicle's dynamic handling, ride comfort, and safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0027] Figure 3 This is a schematic diagram showing the positions of the various oil chambers and water chambers in this invention.

[0028] Figure 4 yes Figure 2 A schematic diagram of the cross-sectional structure at point AA.

[0029] Figure 5 yes Figure 2 A magnified structural diagram at point B in the middle.

[0030] Figure 6 yes Figure 2 A magnified structural diagram at point C.

[0031] Figure 7 This is a schematic diagram of the overall structure of shell I in this invention.

[0032] Figure 8 This is a schematic diagram of the overall structure of shell II in this invention.

[0033] Figure 9 This is a schematic diagram of the overall structure of the oil guide plate in this invention.

[0034] Figure Descriptions: 1. Gas spring body; 11. Cylinder I; 111. Cylinder bottom I; 112. Guide sleeve I; 12. Hollow piston rod I; 121. Damping hole; 122. Rod head; 13. Piston I; 14. Housing I; 141. Water inlet; 142. Water guide strip; 15. Connecting rod; 2. Drive assembly; 21. Cylinder II; 211. Water outlet; 212. Cylinder bottom II; 213. Guide sleeve II; 22. Hollow piston rod II; 221. Through hole; 222. Oil guide plate; 23. 1. Piston II, 231. Gasket I, 24. Hollow piston rod III, 25. Piston III, 251. Gasket II, 26. Housing II, 261. Oil guide strip, 31. Oil chamber I, 32. Oil chamber II, 33. Oil chamber III, 34. Oil chamber IV, 35. Oil chamber V, 36. Oil chamber VI, 37. Oil passage I, 38. Oil passage II, 39. Oil passage III, 41. Water chamber I, 42. Water chamber II, 43. Water chamber III, 44. Water passage I, 51. Air inlet, 52. Oil inlet I, 53. Oil inlet II. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the features and performance of a self-driving heat dissipation oil-gas spring of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Please see the appendix Figures 1-9A self-driving heat dissipation oil-gas spring includes an oil-gas spring body 1 and a drive assembly 2 arranged parallel to the oil-gas spring body 1.

[0037] The hydraulic spring body 1 includes a cylinder body I11, a hollow piston rod I12, and a piston I13. The piston I13 is located at one end of the hollow piston rod I12 inside the cylinder body I11 and slides against the inner wall of the cylinder body I11. The cylinder body I11 is provided with an air inlet 51, and the hollow piston rod I12 is provided with an oil inlet I52.

[0038] The inner cavity of the hollow piston rod I12 forms oil chamber I31, and the hollow piston rod I12, piston I13 and cylinder I11 form oil chamber II32. The hollow piston rod I12 is provided with a damping hole 121 that connects oil chamber I31 and oil chamber II32.

[0039] A housing I14 is fitted onto the cylinder block I11, forming a water cavity I41 between the housing I14 and the cylinder block I11. The housing I14 has a water inlet 141 that connects to the water cavity I41. Specifically, the inner wall of the housing I14 has multiple axially extending water guide strips 142, which are evenly distributed circumferentially on the inner wall of the housing I14 to increase the flow path of cooling water in the annular water cavity I41 and improve the cooling effect.

[0040] The drive assembly 2 includes a cylinder body II 21, a hollow piston rod II 22, a piston II 23, a hollow piston rod III 24, and a piston III 25. The cylinder body II 21 is fixedly connected to the cylinder body I 11. The hollow piston rod II 22 is fixedly disposed inside the cylinder body II 21. The hollow piston rod III 24 is fixedly connected to the hollow piston rod I 12 and can slide back and forth with the hollow piston rod I 12. One end of the hollow piston rod III 24 is located inside the cylinder body II 21 and is sleeved on the hollow piston rod II 22. The piston III 25 is disposed at the end of the hollow piston rod III 24 located inside the cylinder body II 21 and slides in cooperation with the inner wall of the cylinder body II 21 and the outer wall of the hollow piston rod II 22. The piston II 23 is disposed at the end of the hollow piston rod II 22 located inside the hollow piston rod III 24 and slides in cooperation with the inner wall of the hollow piston rod III 24.

[0041] Specifically, the hollow piston rod II22 is fixedly installed inside the cylinder body II21 via the oil guide plate 222, and the hollow piston rod III24 is fixedly connected to the hollow piston rod I12 via the connecting rod 15.

[0042] A housing II26 is fitted onto the cylinder body II21. The housing II26 and the cylinder body II21 form an oil chamber III33. The inner cavity of the hollow piston rod II22 forms an oil chamber IV34. The hollow piston rod II22, piston II23, hollow piston rod III24, and piston III25 form an oil chamber V35. The inner cavity of the hollow piston rod III24 forms an oil chamber VI36.

[0043] Specifically, the inner wall of housing II26 is provided with a plurality of circumferentially extending oil guide strips 261. The oil guide strips 261 are C-shaped and the plurality of oil guide strips 261 are evenly distributed along the axial direction on the inner wall of housing II26. The notches of adjacent oil guide strips 261 are staggered to increase the flow path of hydraulic oil in annular oil chamber III33 and improve the cooling effect.

[0044] Oil chamber Ⅲ33 is connected to oil chamber Ⅱ32, and oil chamber Ⅳ34 is connected to oil chamber Ⅲ33. Hollow piston rod Ⅱ22 is provided with a through hole 221 connecting oil chamber Ⅳ34 and oil chamber Ⅴ35. Piston Ⅱ23 is provided with a one-way valve structure that allows hydraulic oil to enter oil chamber Ⅵ36 from oil chamber Ⅵ36 and oil chamber Ⅴ31.

[0045] The cylinder body II21, hollow piston rod III24, and piston III25 form a water chamber II42. The inner cavity of the cylinder body II21 forms a water chamber III43. The water chamber II42 is connected to the water chamber I41. The piston III25 is provided with a one-way valve structure that allows cooling water to enter the water chamber III43 from the water chamber II42. The cylinder body II21 is provided with an outlet 211 that connects to the water chamber III43.

[0046] Specifically, an oil passage I37 is provided at the fixed connection between cylinder body I11 and cylinder body II21, which connects oil chamber II32 and oil chamber III33. An oil passage II38 is provided in the oil guide plate 222, connecting oil chamber III33 and oil chamber IV34. An oil passage III39 is provided in the connecting rod 15, connecting oil chamber I31 and oil chamber VI36, and an oil inlet II53 is provided on the connecting rod 15. A water passage I44 is provided at the fixed connection between cylinder body II21 and cylinder body I11, connecting water chamber I41 and water chamber II42. The one-way valve structure on piston II23 includes a gasket I231, which allows hydraulic oil to flow unidirectionally from oil chamber VI36 into oil chamber V35. The one-way valve structure on piston Ⅲ25 includes gasket Ⅱ251, through which cooling water can be unidirectionally entered from water chamber Ⅱ42 into water chamber Ⅲ43.

[0047] The reciprocating motion of hollow piston rod I12 relative to cylinder I11 drives the reciprocating motion of hollow piston rod III24 relative to cylinder II21 and hollow piston rod II22, providing power for the internal circulation of hydraulic oil and the circulation of cooling water, thereby achieving the cooling of hydraulic oil by cooling water.

[0048] In a specific implementation, a gas spring with self-driving heat dissipation function includes two main parts: a gas spring body 1 and a drive component 2.

[0049] The cylinder body I11 of the gas spring body 1 includes a cylinder bottom I111 at one end and a guide sleeve I112 at the other end. A hollow piston rod I12 and a piston I13 are assembled in the cylinder body I11. The guide sleeve I112 and the piston I13 support the hollow piston rod I12 to reciprocate along the axial direction of the cylinder body I11. One end of the hollow piston rod I12 is provided with a rod head 122. Both the cylinder bottom I111 and the rod head 122 are provided with lugs for assembling and connecting the gas spring in the vehicle.

[0050] The cylinder block I11 is externally fitted with a shell I14, and the shell I14 and the outer wall of the cylinder block I11 together form an annular water cavity I41. The inner wall of the shell I14 is provided with axially extending water guide strips 142, which are spaced apart circumferentially, thus dividing the annular water cavity I41 into multiple continuous circumferential flow channels. The shell I14 is provided with a cooling water inlet 141 for connecting to an external cooling water tank.

[0051] Two interconnected cooling water channels I44 are provided on the cylinder block I11 and the cylinder block II21 of the drive assembly 2. One end of the channel I44 is connected to the annular water chamber I41, and the other end is connected to the water chamber II42 inside the drive assembly 2.

[0052] The cylinder body I11 of the gas spring body 1 is equipped with a drive assembly 2 mounted side by side on the outside. The cylinder body II21, guide sleeve II213, hollow piston rod III24, and piston III25 of the drive assembly 2 together form a water cavity II42. The inner cavity of the cylinder body II21, namely the cylinder body II21, cylinder bottom II212, hollow piston rod II22, and piston III25 together form a water cavity III43.

[0053] Water chamber I 41 and water chamber II 42 are connected by water passage I 44 located inside cylinder block I 11 and cylinder block II 21. Piston III 25 has a through hole, which, in conjunction with gasket II 251, forms a one-way valve structure. This one-way valve structure connects water chamber II 42 and water chamber III 43, allowing cooling water to flow unidirectionally from water chamber II 42 into water chamber III 43. Water chamber III 43 is connected to an external water tank via an outlet 211 located on cylinder bottom II 212.

[0054] The hollow piston rod I12 of the gas spring body 1 is connected to the hollow piston rod III24 of the drive assembly 2 via a connecting rod 15. The hollow piston rod III24 and the hollow piston rod II22 cooperate to guide the oil fluid to flow in a predetermined direction along a preset path during the movement of the gas spring.

[0055] The oil chamber I31 of the gas spring body 1 is connected to the oil chamber VI36 of the hollow piston rod III24 through the oil passage III39 in the connecting rod 15. The hollow piston rod III24 is provided with a one-way valve structure formed by the through hole on the piston II23 and the gasket I231. This one-way valve connects the oil chamber V35 and the oil chamber VI36, which are enclosed by the hollow piston rod II22, piston II23, hollow piston rod III24, and piston III25, and restricts the unidirectional flow of oil from the oil chamber VI36 to the oil chamber V35.

[0056] Oil chamber V35 is connected to oil chamber IV34 formed by the inner cavity of hollow piston rod II22 through through hole 221 on hollow piston rod II22. Oil chamber IV34 extends to the position of oil guide plate 222 and is connected to oil chamber III33 formed by cylinder block II21 and housing II26 through oil passage II38 in oil guide plate 222. Oil guide strip 261 extending circumferentially is provided on the inner wall of housing II26, and oil guide strip 261 divides fixed flow channels in the axial direction.

[0057] Oil chamber Ⅲ33 is connected to oil chamber Ⅱ32 of the gas spring body 1 through oil passage Ⅰ37 provided on cylinder Ⅰ11 and cylinder Ⅱ21. Oil chamber Ⅱ32 is connected to oil chamber Ⅰ31 through damping hole 121 provided on hollow piston rod Ⅰ12, thus forming a closed circulation oil circuit.

[0058] An air inlet 51 is provided on the cylinder bottom I111 of the gas spring body 1, an oil inlet I52 is provided on the rod head 122, and an oil inlet II53 is provided on the connecting rod 15.

[0059] Hydraulic oil is injected into the oil spring through oil inlet I 52 and replenished through oil inlet II 53. After injection, oil inlet I 52 and oil inlet II 53 are closed, and nitrogen is injected through air inlet 51.

[0060] The flow logic of internal hydraulic oil and cooling water during the compression process of a gas spring is as follows.

[0061] During the compression of the hollow piston rod I12, the volume of oil chamber I31 decreases, and a small portion of the oil flows into oil chamber II32 through damping orifice 121. However, due to the small diameter of damping orifice 121, the flow resistance along this path is relatively large, so most of the oil enters oil chamber VI36 through oil passage III39. As the volume of oil chamber VI36 also decreases during the compression process, the oil entering oil chamber VI36, along with the original oil in oil chamber VI36, enters oil chamber V35 through the one-way valve on piston II23. Of the oil entering oil chamber V35, a portion remains in the increased volume of oil chamber V35, while the remainder continues to enter oil chamber IV34 through through hole 221, and then sequentially through oil passage II38, oil chamber III33, and oil passage I37 into the increased volume of oil chamber II32.

[0062] During the compression process of the hollow piston rod I12, the volume of water chamber III43 decreases, and the cooling water in water chamber III43 is discharged from the outlet 211 to the external water tank. The volume of water chamber II42 increases, and due to the direction of the one-way valve on piston III25, the negative pressure generated in water chamber II42 draws cooling water from water chamber I41 through water channel I44. Water chamber I41 then draws cooling water from the external water tank through inlet 141.

[0063] The flow logic of internal hydraulic oil and cooling water during the stretching process of a gas spring is as follows.

[0064] During the stretching of the hollow piston rod I12, the volumes of oil chambers I31 and VI36 increase, while the volumes of oil chambers II32 and V35 decrease. Due to the direction of the one-way valve on piston II23, the oil in oil chamber V35 sequentially enters oil chamber II32 through through hole 221, oil chamber IV34, oil passage II38, oil chamber III33, and oil passage I37. As the volume of oil chamber II32 also decreases, the oil entering oil chamber II32, along with the original oil in oil chamber II32, enters oil chamber I31 through damping hole 121. Oil chamber VI36 draws oil from oil chamber I31 through oil passage III39.

[0065] During the stretching of the hollow piston rod I12, the cooling water in water chamber II42 enters water chamber III43 through the one-way valve on piston III25.

[0066] This invention constructs a collaborative heat dissipation structure, significantly improving the heat dissipation efficiency of the gas spring. Specifically, this invention drives the circulation of cooling water and internal circulation of oil through the drive component 2: cooling water enters water chamber I 41, water chamber II 42, and water chamber III 43 from the external water tank and then returns to the external water tank; oil enters oil chamber VI 36, oil chamber V 35, oil chamber IV 34, oil chamber III 33, and oil chamber II 32 from oil chamber I 31 and then returns to oil chamber I 31. During the circulation process, efficient heat exchange can occur between water chamber I 41 and oil chambers I 31 and II 32, and between water chambers II 42 and III 43 and oil chambers III 33, IV 34, and V 35, allowing the cooling water to carry away the heat from the oil and achieve cooling. Water guide strips 142 and oil guide strips 261 are respectively provided on the inner peripheral walls of housing I14 and housing II26, dividing the corresponding chambers into multiple continuous flow channels, thereby enhancing the heat exchange between the oil and cooling water. This integrated structure makes full use of the hydraulic energy generated during the movement of the gas spring to drive the circulation of oil and cooling water, achieving efficient heat dissipation of the system without the need for an additional power device.

[0067] The hydropneumatic spring provided by this invention innovatively utilizes the system's own reciprocating motion to drive the circulation of cooling water and oil, and achieves efficient heat exchange through an integrated heat dissipation structure. It features a compact structure and requires no external power source. When installed in a vehicle, it can limit temperature rise to a safe range under severe operating conditions, thereby ensuring stable damping performance and avoiding the risks of decreased oil viscosity, thermal degradation of seals, and leakage caused by high temperatures. This significantly improves the vehicle's dynamic stability, driving safety, and service life.

[0068] It should be noted that the parts not described in detail in this solution are all prior art. The above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A hydropneumatic spring with self-driving heat dissipation function, characterized in that: It includes a gas spring body (1) and a drive assembly (2) arranged in parallel with the gas spring body (1). The gas spring body (1) includes a cylinder body I (11), a hollow piston rod I (12), and a piston I (13). The piston I (13) is located at one end of the hollow piston rod I (12) inside the cylinder body I (11) and slides against the inner wall of the cylinder body I (11). The inner cavity of the hollow piston rod I (12) forms oil chamber I (31), and the hollow piston rod I (12), piston I (13) and cylinder I (11) form oil chamber II (32). The hollow piston rod I (12) is provided with a damping hole (121) that connects oil chamber I (31) and oil chamber II (32). A shell I (14) is fitted on the cylinder body I (11). The shell I (14) and the cylinder body I (11) form a water cavity I (41). The shell I (14) is provided with a water inlet (141) that connects to the water cavity I (41). The drive assembly (2) includes cylinder body II (21), hollow piston rod II (22), piston II (23), hollow piston rod III (24), and piston III (25). Cylinder body II (21) is fixedly connected to cylinder body I (11). Hollow piston rod II (22) is fixedly installed inside cylinder body II (21). Hollow piston rod III (24) is fixedly connected to hollow piston rod I (12) and can slide back and forth with hollow piston rod I (12). (24) One end is located inside cylinder body II (21) and sleeved on hollow piston rod II (22). Piston III (25) is located at the end of hollow piston rod III (24) located inside cylinder body II (21) and slides in cooperation with the inner wall of cylinder body II (21) and the outer wall of hollow piston rod II (22). Piston II (23) is located at the end of hollow piston rod II (22) located inside hollow piston rod III (24) and slides in cooperation with the inner wall of hollow piston rod III (24). A housing II (26) is fitted onto cylinder II (21). The housing II (26) and cylinder II (21) form oil chamber III (33). The inner cavity of the hollow piston rod II (22) forms oil chamber IV (34). Oil chamber V (35) is formed between the hollow piston rod II (22), piston II (23), hollow piston rod III (24), and piston III (25). The inner cavity of the hollow piston rod III (24) forms oil chamber VI (35). 36), oil chamber Ⅲ (33) is connected to oil chamber Ⅱ (32), oil chamber Ⅳ (34) is connected to oil chamber Ⅲ (33), hollow piston rod Ⅱ (22) is provided with a through hole (221) connecting oil chamber Ⅳ (34) and oil chamber Ⅴ (35), piston Ⅱ (23) is provided with a one-way valve structure that allows hydraulic oil to enter oil chamber Ⅴ (35) from oil chamber Ⅵ (36), oil chamber Ⅵ (36) is connected to oil chamber Ⅰ (31), The cylinder body II (21) forms a water chamber II (42) with the hollow piston rod III (24) and piston III (25). The inner cavity of the cylinder body II (21) forms a water chamber III (43). The water chamber II (42) is connected to the water chamber I (41). The piston III (25) is provided with a one-way valve structure that allows cooling water to enter the water chamber III (43) from the water chamber II (42). The cylinder body II (21) is provided with an outlet (211) that connects to the water chamber III (43). The reciprocating motion of hollow piston rod I (12) relative to cylinder I (11) can drive hollow piston rod III (24) relative to cylinder II (21) and hollow piston rod II (22) to reciprocate, providing power for the internal circulation of hydraulic oil and the circulation of cooling water, and realizing the cooling of hydraulic oil by cooling water.

2. The hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: At the fixed connection between cylinder block I (11) and cylinder block II (21), there is an oil passage I (37) and a water passage I (44). The oil passage I (37) is used to connect oil chamber II (32) and oil chamber III (33), and the water passage I (44) is used to connect water chamber I (41) and water chamber II (42).

3. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: Hollow piston rod II (22) is fixed inside cylinder body II (21) via oil guide plate (222). Oil guide plate (222) is provided with oil passage II (38) for connecting oil chamber III (33) and oil chamber IV (34).

4. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: Hollow piston rod Ⅲ (24) is fixedly connected to hollow piston rod Ⅰ (12) via connecting rod (15). The connecting rod (15) is provided with oil passage Ⅲ (39) for connecting oil chamber Ⅰ (31) and oil chamber Ⅵ (36).

5. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: Multiple axially extending water guide strips (142) are provided on the inner wall of shell I (14). The multiple water guide strips (142) are evenly distributed circumferentially on the inner wall of shell I (14) to increase the flow path of cooling water in the annular water cavity I (41) and improve the cooling effect.

6. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: Multiple circumferentially extending oil guide strips (261) are provided on the inner wall of housing II (26). The oil guide strips (261) are C-shaped and the multiple oil guide strips (261) are evenly distributed axially on the inner wall of housing II (26). The notches of adjacent oil guide strips (261) are staggered to increase the flow path of hydraulic oil in annular oil cavity III (33) and improve the cooling effect.

7. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: The cylinder block I (11) is provided with an air injection port (51).

8. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: The hollow piston rod I (12) is provided with an oil inlet I (52).

9. A hydropneumatic spring with self-driving heat dissipation function as described in claim 1, characterized in that: The one-way valve structure on piston II (23) includes gasket I (231), through which hydraulic oil can be unidirectionally entered from oil chamber VI (36) into oil chamber V (35). The one-way valve structure on piston III (25) includes gasket II (251), through which cooling water can be unidirectionally entered from water chamber II (42) into water chamber III (43).

10. A hydropneumatic spring with self-driving heat dissipation function as described in claim 4, characterized in that: The connecting rod (15) is provided with an oil inlet II (53).

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