Hydro-pneumatic spring with heat dissipation function

Abstract

The utility model discloses a hydro-pneumatic spring with a heat dissipation function, and belongs to the technical field of hydro-pneumatic springs. The device comprises a hydro-pneumatic spring body, a floating piston, a one-way check valve, a cooler and a pipeline system. The floating piston achieves oil-gas isolation, the main piston divides an inner cavity of the cylinder body into a center cavity and an annular cavity, and the center cavity and the annular cavity are communicated through a piston rod damping oil channel and an external pipeline. The core innovation is that in the active cooling circulation, in the compression stroke, hot oil in a central cavity is pressed out, is forcibly guided into an external cooler through a one-way check valve to be cooled, and then is injected into an annular cavity; and in the stretching stroke, the oil flows back to the central cavity through the damping hole. By means of the structure, a double heat dissipation mechanism combining cylinder barrel convection radiation heat dissipation and oil liquid replacement convection heat dissipation is formed, the limitation that a traditional hydro-pneumatic spring only relies on a cylinder body for heat dissipation is broken through, the temperature of oil liquid and gas can be actively and efficiently controlled, temperature rise is remarkably restrained, and sealing reliability and system work stability are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil gas spring, in particular to an oil gas spring with heat dissipation function. The core technology focuses on the thermal management design of the oil gas spring, aiming to solve the problem of local high temperature rise of the traditional oil gas spring under high frequency working condition. BACKGROUND

[0002] The oil gas spring has excellent damping effect and has been widely used in suspension damping systems of heavy trucks and engineering vehicles. The traditional oil gas spring realizes damping and load support through oil gas mixed medium. The hydraulic oil generates nonlinear damping force under the throttling effect of damping hole, and the high pressure gas undergoes an approximately adiabatic compression process, forming a unique rigid-flexible coupling damping mechanism. Under severe working conditions, the traditional oil gas spring has the phenomenon of system thermal imbalance (heat exchange power < heat generation power), which causes high temperature rise in the guide sleeve position and the nitrogen contact area, reduces the viscosity of the oil, and causes the sealing element to be thermally degraded and then leak, which seriously affects the dynamic stability and driving safety of the vehicle. Therefore, the thermal balance system with low temperature rise design is the key to the high reliability of the oil gas spring. SUMMARY

[0003] The present application aims to provide an oil gas spring with heat dissipation function, which solves the problem of high temperature rise in the guide sleeve position and the nitrogen contact area of the traditional oil gas spring under severe working conditions due to system thermal imbalance (heat exchange power < heat generation power), which causes the oil viscosity to decrease and the sealing element to be thermally degraded and then leak.

[0004] The present application provides an oil gas spring with heat dissipation function, which comprises an oil gas spring body, a floating piston, a one-way check valve, a cooler, a water tank and a pipeline system. The floating piston separates the oil and gas, the hollow piston rod is nested in the inner cavity of the cylinder body, the hollow piston rod can move reciprocally along the axis direction of the cylinder body, the lower end of the cylinder body is equipped with a guide sleeve, the hollow piston rod is arranged in the assembly hole of the guide sleeve, the outer wall of the hollow piston rod is provided with a main piston which is sealed with the inner cavity of the cylinder body, the main piston and the piston rod separate the inner cavity of the cylinder body into a first inner cavity and a second inner cavity, the piston rod is provided with a damping oil channel which communicates the first inner cavity and the second inner cavity, and the head of the hollow piston rod and the lower part of the annular cavity of the cylinder body are provided with an oil channel through pipeline to communicate the two chambers.

[0005] Further, the floating piston structure is used to realize oil gas isolation, and the oil circulation path is optimized so that the low temperature oil treated by the cooler is injected into the annular cavity, which significantly relieves the thermal degradation effect of the sealing element and improves the high temperature rise problem of the guide sleeve position and the nitrogen contact area of the traditional oil gas spring.

[0006] Further, the oil liquid replacement system starts from the pipeline interface of the main oil passage at the lower end of the hollow piston rod, and sequentially arranges a one-way check valve, a first oil injection port, a 90-degree hydraulic elbow, a spiral bellows, a cooler, a high-pressure hose, a second oil injection port and a terminal pipeline interface in the fluid transmission direction to jointly form a communication loop between the center cavity and the annular cavity of the cylinder.

[0007] Further, the cooling water circulation system connected with the water tank is arranged, and the tightly coiled rectangular cooling water circulation pipeline is arranged outside the cylinder.

[0008] Further, the cylinder convection radiation heat dissipation design is adopted, and the key parameters of the rectangular cooling water hose coiled on the outer wall of the cylinder can be determined based on the heat exchange efficiency, including the cross-sectional size, the coiled length and the effective heat dissipation area. h 1 The reasonable range of the convection heat transfer coefficient between the oil gas and the inner wall of the oil cylinder is about 100-150 W / m2 K. The value is affected by the actual working condition and the dynamic change of the oil gas, and needs to be further verified and calibrated through experiments combined with specific application scenarios.

[0009] Further, the oil liquid replacement convection heat dissipation design is adopted, and the key parameters of the cooler can be determined based on the heat exchange efficiency, including the structural volume, the channel cooling pipe diameter configuration, the flow channel length and the cooling water flow channel cross-sectional area.

[0010] Compared with the prior art, the oil gas spring with heat dissipation function has the following characteristics and advantages:

[0011] The oil gas spring with heat dissipation function has low cost and can dissipate heat in time, and significantly improves the dynamic stability and driving safety of the carrier. The floating piston structure isolates the oil gas, reduces the heat diffusion of the gas to the oil liquid during vibration; the tightly coiled rectangular cooling water hose on the cylinder effectively reduces the temperature of the nitrogen and oil liquid in the cylinder chamber through convection and radiation heat dissipation; the cooler of the oil liquid pipeline effectively reduces the temperature of the oil liquid in the oil liquid pipeline during the oil liquid replacement process. The cylinder convection radiation heat dissipation and the oil liquid replacement heat dissipation can dissipate heat in time, effectively reduce the leakage risk of the piston rod and the guide sleeve caused by the reduction of the oil liquid viscosity and the thermal degradation of the sealing element due to the rise of the oil liquid temperature. The oil gas spring with heat dissipation function sets the traditional oil gas spring at the oil injection port of the piston rod and the cylinder, and sets the one-way check valve on the oil liquid pipeline, which improves the convenience of maintenance.

[0012] The characteristics and advantages of the present application will become more apparent after reading the specific embodiments of the present application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced.

[0014] Fig. 1 Structure sectional view of oil gas spring with heat dissipation function;

[0015] Fig. 2 Position sectional view of sealing ring and guide ring of oil gas spring with heat dissipation function;

[0016] Wherein, 1, cylinder, 11, air cavity, 12, oil cavity, 121, rodless oil cavity, 122, center oil cavity, 123, annular oil cavity, 13, gas injection port, 14, main gas channel, 2, hollow piston rod, 21, damping hole, 22, main oil channel, 3, guide sleeve, 41, main piston, 42, floating piston, 5, oil pipeline, 51, pipeline joint, 511, hollow piston rod pipeline joint, 512, cylinder pipeline joint, 52, one-way check valve, 53, first oil injection port, 54, 90° hydraulic elbow, 55, spiral bellows, 57, high-pressure hose, 58, second oil injection port, 6, cooling system, 61, water tank, 62, rectangular cooling water hose, 63, ordinary cooling water hose, 64, oil cooler, 71, guide ring I, 72, guide ring II, 73, guide ring III, 81, sealing ring I, 82, sealing ring II, 9, assembly ear DETAILED DESCRIPTION

[0017] As Figs. 1-2 shown, the present embodiment provides an oil gas spring with heat dissipation function, which comprises a cylinder 1 and a hollow piston rod 2. The hollow piston rod 2 is nested in the inner cavity of the cylinder 1 and can move reciprocally along the axial direction of the cylinder 1. The left end of the cylinder 1 is provided with an assembly ear 9, and the right end of the hollow piston rod 2 is also provided with an assembly ear 9. The oil gas spring of the present embodiment can be assembled on a vehicle through the assembly ears 9 at both ends.

[0018] The guide sleeve 3 is provided with a short hole, and the lower end of the cylinder body 1 is provided with a threaded hole. The guide sleeve 3 is connected to the lower end of the cylinder body 1 by bolts, so that the right end of the cylinder body 1 is assembled with the guide sleeve 3. The hollow piston rod 2 is arranged in the assembly hole of the guide sleeve 3. The sealing ring I 81 is arranged between the guide sleeve 3 and the cylinder body 1 to realize the sealing of the guide sleeve 3 and the cylinder body 1. The sealing ring I 81 is arranged between the inner wall of the assembly hole of the guide sleeve 3 and the hollow piston rod 2 to realize the sealing of the assembly hole of the guide sleeve 3 and the hollow piston rod 2. The guide ring I 71 is arranged between the assembly hole of the guide sleeve 3 and the hollow piston rod 2 to guide the reciprocating movement of the hollow piston rod 2. The upper end of the hollow piston rod 2 is provided with a main piston 41, and the main piston 41 is sealed with the inner cavity of the cylinder body 1. The main piston 41 divides the inner cavity of the cylinder body 1 into a rodless oil cavity 121 and a center oil cavity 122. The rod wall of the hollow piston rod 2 is provided with a damping hole 21, and the damping oil hole 21 communicates the center oil cavity 122 and the annular oil cavity 123. The main piston 41 can reciprocate along the axis direction of the cylinder body 1, and the guide ring III 73 is arranged between the main piston 41 and the inner cavity of the cylinder body 1 to guide the reciprocating movement of the main piston 41. The sealing ring II 82 is arranged between the floating piston 42 and the inner wall of the cylinder body 1 to divide the inner cavity of the cylinder body 1 into a gas cavity 11 and an oil cavity 12. The floating piston 42 can reciprocate along the axis direction of the cylinder body 1, and the guide ring II 72 is arranged between the floating piston 42 and the inner cavity of the cylinder body 1 to guide the reciprocating movement of the floating piston 42.

[0019] The main gas channel 14 is arranged in the upper end of the cylinder body 1, and the gas injection port 13 is arranged in the upper end of the cylinder body 1. The main oil channel 22 is arranged in the lower end of the hollow piston rod 2. The oil pipeline 5 starts from the hollow piston rod pipeline joint 511 connected to the main oil channel 22 in the lower end of the hollow piston rod 2, and sequentially arranges the one-way check valve 52, the first oil injection port 53, the 90° elbow 54, the spiral corrugated pipe 55, the cooler 64, the high-pressure hose 57, the second oil injection port 58 and the cylinder body pipeline joint 512 in the fluid transmission direction, which together constitute a communication loop between the center cavity and the annular cavity of the cylinder body. The cooler 64 is fixed to the bottom of the vehicle body to support the expansion and contraction of the spiral corrugated pipe 55.

[0020] The oil-gas spring with heat dissipation function of the embodiment injects nitrogen into the gas cavity 11 above the floating piston 41 through the gas injection port 13. The oil liquid is injected into the oil liquid pipeline 5 and the oil cavity 12 below the floating piston 42 through the first oil injection port 53.

[0021] The oil-gas spring with heat dissipation function of the embodiment adopts double heat dissipation mechanisms: one is convection and radiation heat dissipation of the cylinder, and the other is convection heat dissipation of oil replacement. Because the floating piston 42 isolates the gas cavity 11 and the oil cavity 12, the heat generated by nitrogen in the gas cavity 11 during vibration is reduced to diffuse to the oil in the oil cavity 12. The heat accumulated in the gas cavity 11 and part of the heat of the oil is dissipated by convection and radiation between the cooling water in the rectangular cooling water hose 62 tightly wound on the cylinder body 1 and the cooling water in the hose. During the replacement of the oil from the rodless oil cavity 121 to the annular oil cavity 123 through the oil pipeline 5, the cooling water flowing through the cooler 64 is dissipated by convection. The cooling water in each link is connected to the cooling system 6 through the water tank 61 and the pipeline system to reduce the temperature of the cooling water.

[0022] During the working process of the oil-gas spring with heat dissipation function of the embodiment, when the 41 main piston moves upward under the action of external force, the oil pressure in the rodless oil cavity 121 and the central oil cavity 122 is increased, the oil pressure in the annular oil cavity 123 is reduced, the one-way check valve 52 on the oil pipeline 5 is opened, and the oil flows from the central oil cavity 122 to the annular oil cavity 123 through the oil pipeline 5; when the 41 main piston moves downward under the action of external force, the oil pressure in the rodless oil cavity 121 and the central oil cavity 122 is reduced, the oil pressure in the annular oil cavity 123 is increased, the one-way check valve 52 on the oil pipeline 5 is closed, and the oil flows from the annular oil cavity 123 to the central oil cavity 122 through the damping hole 21 in the wall of the hollow piston rod 2. In the above process, the heat of the oil and gas in the cylinder body 1 is transferred to the surrounding environment and the cooling system 6 to achieve the effect of timely heat dissipation.

[0023] The oil-gas spring with heat dissipation function of the embodiment has low cost and can dissipate heat in time. When the oil-gas spring with heat dissipation function of the embodiment is assembled on a vehicle, the temperature of the gas and the oil can be actively cooled under severe working conditions, the oil temperature rise is controlled within a safe range, the viscosity of the oil is prevented from being reduced and the sealing element is prevented from being thermally degraded due to high temperature, thereby effectively reducing the leakage risk between the piston rod and the guide sleeve and significantly improving the dynamic stability and driving safety of the vehicle.

[0024] Thermal equilibrium calculation

[0025] To keep the oil temperature of the oil-gas spring with heat dissipation function of the embodiment within a safe range, appropriate cooling devices such as a cooler (the area of the outer wall of the cooling pipe, the equivalent diameter of the cooling water, and the size of the cooler), a cooling water hose (the contact area with the steel wall, the material, and the equivalent diameter of the cooling water), a pump (the flow rate of the cooling water), and a water tank (the heat dissipation power of the cooling system) need to be selected through thermal equilibrium calculation to form a cooling system.

[0026] Calculation of convective heat transfer coefficient: under severe working conditions of the oil-gas spring, the flow is usually turbulent. In the vehicle cooling system, the flow rate of the cooling water is high (usually 0.5 m / s to 3 m / s), which ensures efficient heat transfer. The calculation formula of the Reynolds number is:

[0027] ,

[0028] wherein: is the density of the cooling water (kg / m³),

[0029] v is the flow velocity of the cooling water (m / s),

[0030] D h is the equivalent diameter of the fluid (m), ( A is the cross-sectional area of the fluid flow, P is the wetted perimeter),

[0031] μ is the dynamic viscosity of the cooling water (Pa·s).

[0032] The Nusselt number for turbulent flow is calculated using the Dittus-Boelter formula N u (heated n = 0.4, cooled n = 0.3):

[0033] ,

[0034] wherein: Prandtl number (c p is the specific heat capacity J / (kg·K), k is the thermal conductivity of the cooling water (W / m·K)).

[0035] ,

[0036] wherein: h is the convective heat transfer coefficient (W / m²·K).

[0037] 1. Cylinder barrel convection and radiation heat dissipation

[0038] In the process of vibration damping, the cooling water in the cooling water hose wound on the cylinder body is dissipated by convection and radiation. The whole heat conduction path is: oil liquid → oil cylinder inner wall (convection) → oil cylinder wall (heat conduction) → hose contact surface (contact thermal resistance) → hose (heat conduction) → cooling water (convection). The sum of the thermal resistances of each link of the cylinder barrel convection and radiation heat dissipation is: ,

[0039] wherein: R 缸体 is the total thermal resistance between the oil liquid and the cooling water in the rectangular cooling water hose (K / W),

[0040] R 1Convection heat resistance of oil to inner wall of cylinder (K / W),

[0041] R 2 Thermal conduction heat resistance of oil cylinder wall (K / W),

[0042] R 3 Contact heat resistance of rectangular cooling water hose to steel wall (K / W),

[0043] R 4 Thermal conduction heat resistance of rectangular cooling water hose wall (K / W),

[0044] R 5 Convection heat resistance of cooling water in rectangular cooling water hose (K / W).

[0045] 1.1 Convection heat resistance of oil to inner wall of oil cylinder ,

[0046] Wherein: h 1 The reasonable range of convection heat transfer coefficient of oil gas in oil cylinder to inner wall of oil cylinder is about 100-150 W / m²·K (estimated based on traditional oil gas spring experiment), which is affected by factors such as actual working condition and dynamic change of oil gas mixture state, and needs to be further verified and calibrated through experiment combined with specific application scene,

[0047] A 1 Surface area of oil cylinder (m²).

[0048] 1.2 Thermal conduction heat resistance of inner wall of oil cylinder to outer wall ,

[0049] Wherein: r2 is the outer wall radius of oil cylinder wall (m),

[0050] r1 is the inner wall radius of oil cylinder wall (m),

[0051] k 缸体 Thermal conductivity of oil cylinder wall (W / m²·K), oil cylinder is steel material k 缸体 The range is 45-50 W / m²·K,

[0052] L Effective height of hose winding on outer wall of oil cylinder (m).

[0053] 1.3 Contact heat resistance of outer wall of oil cylinder to cooling water hose ,

[0054] Wherein: h接触 is the contact thermal conductance (W / m²·K),

[0055] A 3 is the contact area of the cooling water hose (m²).

[0056] 1.4 Conduction thermal resistance of the cooling water hose inner wall to the outer wall ,

[0057] where: t 冷却水软管 is the cooling water hose wall thickness (m),

[0058] k 冷却水软管 is the thermal conductivity of the cooling water hose (W / m²·K), commonly taken as 0.2 for rubber and 0.5 for silicone,

[0059] A 4 is the heat transfer area of the cooling water hose (m²).

[0060] 1.5 Convective thermal resistance of the hose outer wall to the cooling water ,

[0061] where: h 5 is the convective heat transfer coefficient of the cooling water in the cooling hose (W / m²·K),

[0062] A 5 is the contact area of the cooling water with the cooling water hose (m²).

[0063] 1.6 Cylinder convective and radiative heat dissipation power, ,

[0064] where: P 缸体 is the cylinder convective and radiative heat dissipation power (W),

[0065] T 油 is the oil temperature, commonly taken as 70-80°C,

[0066] T 水 is the cooling water temperature, commonly taken as 20-30°C.

[0067] 2. Oil replacement heat dissipation

[0068] In the process of oil displacement from the rodless oil chamber to the annular oil chamber through the oil pipeline, the oil in the cooling pipe of the oil cooler is cooled by convection. The whole heat transfer path is: oil → cooling pipe inner wall (convection) → cooling pipe wall (conduction) → cooling water (convection). The sum of the thermal resistances of each link of oil displacement and heat dissipation is: ,

[0069] In the formula: R 冷却器 Rth is the total thermal resistance between the oil and the cooling water in the cooler (K / W),

[0070] R 6 Rconv is the convection thermal resistance between the oil and the cooling pipe inner wall (K / W),

[0071] R 7 Rcond is the conduction thermal resistance of the cooling pipe wall (K / W),

[0072] R 8 Rconv is the convection thermal resistance between the cooling pipe wall and the cooling water in the cooler (K / W).

[0073] 2.1 Convection thermal resistance of oil to cooling pipe inner wall ,

[0074] In the formula: h 6 h is the convection heat transfer coefficient of the oil in the cooling pipe (W / m²·K), and the forced convection is about 50-2000 W / (m²·K),

[0075] A 6 A is the surface area of the cooling pipe inner wall (m²).

[0076] 2.2 Conduction thermal resistance of cooling pipe inner wall to outer wall ,

[0077] In the formula: t 冷却管 L is the thickness of the cooling pipe wall (m),

[0078] k 冷却管 k is the thermal conductivity of the cooling pipe (W / m²·K),

[0079] A 7 A is the heat transfer area of the cooling pipe (m²).

[0080] 2.3 Convection thermal resistance of cooling pipe outer wall to cooling water ,

[0081] In the formula: A8 is the outer surface area of the cooling tube (m2),

[0082] h 8 is the convective heat transfer coefficient of the cooling water in the cooler (W / m2·K),

[0083] 2.4 Oil displacement heat dissipation power ,

[0084] where: P 冷却器 is the heat dissipation power of the cooler (W).

[0085] 3. External work heat generation power

[0086] 3.1 External nitrogen work heat generation power

[0087] Internal energy formula derived from the Van der Waals real gas state equation: ,

[0088] where: U is the internal energy of the gas (J),

[0089] C v is the molar constant volume heat capacity (J / (mol·K)), which represents the heat required to raise the temperature of a unit amount of gas by 1 K during constant volume,

[0090] T is the temperature (K),

[0091] n is the amount of substance of the gas (mol),

[0092] a is the Van der Waals constant (Pa·m 6 / mol²),

[0093] V is the volume of the gas (m³).

[0094] External nitrogen work power: ,

[0095] where: P 氮气 is the external nitrogen work power (W),

[0096] P is the nitrogen pressure when the oil gas spring is working (Pa),

[0097] v is the relative speed of the cylinder and piston rod (m / s).

[0098] The total heat production power (W) of the oil-air spring: ,

[0099] where: P 氮气产热 is the heat production power (W) of the oil-air spring.

[0100] 3.2 Friction heat production power

[0101] The friction heat production of the oil-air spring is mainly from the sliding friction between the piston rod and the guide sleeve, and the piston and the inner wall of the cylinder. The contact between the seal and the metal wall is the main heat source.

[0102] The friction force between the inner wall of the cylinder and the piston: ,

[0103] where: f 1 is the friction force (N) between the inner wall of the cylinder and the piston,

[0104] μ 1 is the friction coefficient between the inner wall of the cylinder and the piston,

[0105] p 1 is the sealing contact pressure (Pa) between the inner wall of the cylinder and the piston,

[0106] l 1 is the width (m) of the seal between the inner wall of the cylinder and the piston.

[0107] The friction force between the guide sleeve and the piston rod: ,

[0108] where: f 2 is the friction force (N) between the guide sleeve and the piston rod,

[0109] μ 2 is the friction coefficient between the guide sleeve and the piston rod,

[0110] p 2 is the sealing contact pressure (Pa) between the guide sleeve and the piston rod,

[0111] l 2 is the width (m) of the seal between the guide sleeve and the piston rod.

[0112] The total friction heat production power (W) of the oil-air spring: ,

[0113] where: P 摩擦Total power of heat generation (W) by oil-gas spring working.

[0114] 3.3 Power of heat generation by damping hole

[0115] In the damping hole, the pressure energy may have other forms of energy loss besides heat energy, such as local eddy current, friction heat generation, mechanical vibration or kinetic energy, potential energy change of oil. Here, the idealized assumption is that all pressure energy is converted into heat.

[0116] ,

[0117] In the formula: Q is the flow rate through the damping hole (m 3 / s), A 2 A is the rod cavity area (m 2 ).

[0118] The pressure difference is obtained from the flow formula of the orifice: ,

[0119] In the formula: P 阻尼孔 Q is the power of heat generation of oil flowing through the damping hole (W).

[0120] 4. Balance of total heat dissipation power and total power of external work

[0121] Total heat dissipation power of the cooling system: ,

[0122] In the formula: P 散热 Q is the total heat dissipation power of the cooling system (W).

[0123] Total power of heat generation of oil-gas spring caused by external work: ,

[0124] In the formula: P 散热 Q is the total power of heat generation of oil-gas spring (W).

[0125] ,

[0126] By adjusting the cooling water flow or increasing the contact area of the hose and the oil cylinder, etc., ensure that the total heat dissipation power is greater than or equal to the total power of heat generation of oil-gas spring caused by external work to maintain the oil temperature within a safe range.

Claims

1. An oil gas spring with heat dissipation function, characterized in that: The oil-gas spring with heat dissipation function comprises an oil-gas spring body, a floating piston, a one-way check valve, a cooler, a water tank and a pipeline system; the floating piston separates the oil and gas; a hollow piston rod is nested in the inner cavity of the cylinder body and can move reciprocally along the axial direction of the cylinder body; a guide sleeve is assembled at the lower end of the cylinder body; the hollow piston rod is arranged in the assembly hole of the guide sleeve; a main piston is arranged on the outer wall of the hollow piston rod and seals the inner cavity of the cylinder body; the main piston and the piston rod separate the inner cavity of the cylinder body into a first inner cavity and a second inner cavity; a damping oil channel is arranged on the piston rod and communicates the first inner cavity and the second inner cavity; the head of the hollow piston rod and the lower part of the annular cavity of the cylinder body are provided with an oil channel passing pipeline to communicate the two cavities.

2. The oil gas spring with heat dissipation function according to claim 1, characterized in that: The oil liquid replacement system starts from the pipeline interface of the main oil channel at the lower end of the hollow piston rod, and sequentially arranges a one-way check valve, a first oil injection port, a 90-degree hydraulic elbow, a spiral corrugated pipe, a cooler, a high-pressure hose, a second oil injection port and a terminal pipeline interface in the fluid transmission direction to jointly form a communication loop between the central cavity and the annular cavity of the cylinder body.

3. The oil gas spring with heat dissipation function according to claim 1, characterized in that: A cooling water circulation system communicating with the water tank is arranged, and a tightly coiled rectangular cooling water circulation pipeline is arranged outside the cylinder body.

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