Double-energy-storage type hydro-pneumatic spring integrated damping suspension hydraulic cylinder and vehicle

Abstract

The invention discloses a double-energy-storage type hydro-pneumatic spring integrated damping suspension hydraulic cylinder and a vehicle. The double-energy-storage type hydro-pneumatic spring integrated damping suspension hydraulic cylinder comprises a mounting cylinder bottom, a suspension cylinder and an energy accumulator. An oil passing channel is formed in the mounting cylinder bottom, and a first communicating opening and two second communicating openings are formed in the mounting cylinder bottom. The suspension cylinder and the energy accumulators are both fixedly installed on the installation cylinder bottom, the two sets of energy accumulators are arranged and located on the two sides of the suspension cylinder in the radial direction respectively, the suspension cylinder and the energy accumulators are communicated with the oil passing channel through the first communication opening and the second communication opening respectively, and the suspension cylinder and the energy accumulators are communicated through the oil passing channel. The problem of pressure loss caused by a lengthy oil way of a traditional suspension system is effectively solved, and internal transmission of the oil way is achieved through integrated installation of the cylinder bottom. The double energy accumulators are symmetrically arranged to form a redundant pressure compensation mechanism, and the pressure stability of the system under the continuous vibration working condition is ensured. The overall structure is compact in design, occupied space is reduced, and the requirement for miniaturization of a suspension system of a special vehicle is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic suspension systems, in particular to a double-accumulator oil-gas spring integrated damping suspension hydraulic cylinder and a vehicle. BACKGROUND

[0002] With the development of special vehicles and engineering machinery, the performance requirements of the suspension system are increasingly improved. Special vehicles such as mine trucks, mine excavators, and semi-trailers require hydraulic cylinders to have both load support and shock absorption functions. The traditional technology adopts a combined scheme of independent suspension cylinders and accumulators, which has many defects: first, the split design leads to large system space occupation and complex pipeline arrangement; second, long oil line connection causes significant pressure loss; third, the single accumulator structure has reliability problems in pressure compensation. In addition, the traditional suspension cylinder connection method with the vehicle frame cannot effectively cope with the eccentric load working condition, and the lateral force easily affects the system stability. In terms of sealing performance, the floating piston sealing structure of the traditional accumulator is prone to leakage problems in long-term high-pressure working environment. In view of the use requirements of special vehicles in harsh working conditions, the existing technology cannot simultaneously meet multiple requirements such as compactness, pressure stability, shock absorption effect, and system reliability. Especially in high-frequency vibration working conditions, the pressure compensation lag problem of the traditional scheme is particularly prominent, which seriously affects the sustainability of the shock absorption performance. SUMMARY

[0003] Therefore, the present application provides a double-accumulator oil-gas spring integrated damping suspension hydraulic cylinder, which has the advantages of compact structure, high pressure stability, reliable and sustainable shock absorption effect, and excellent system sealing performance.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A double-accumulator oil-gas spring integrated damping suspension hydraulic cylinder, comprising: a mounting cylinder bottom, a suspension cylinder, and an accumulator; the mounting cylinder bottom has an oil passage inside and is provided with one communication port one and two communication port twos on the mounting cylinder bottom; the suspension cylinder and the accumulator are both fixedly installed on the mounting cylinder bottom, the accumulator is provided with two groups, the two groups of accumulators are respectively located on both sides in the radial direction of the suspension cylinder, the suspension cylinder and the accumulator are connected with the oil passage through the communication port one and the communication port two, and the suspension cylinder and the accumulator are connected through the oil passage.

[0005] Preferably, the mounting cylinder bottom is provided with a cylinder bottom oil port one and a cylinder bottom oil port two in the radial direction, the cylinder bottom oil port one and the cylinder bottom oil port two are arranged at intervals, and the transmission oil is injected into the oil passage through the cylinder bottom oil port one and the cylinder bottom oil port two and further filled into the inner cavity of the suspension cylinder barrel.

[0006] Preferably, the side of the accumulator away from the mounting cylinder bottom is provided with a gas charging valve, and high-pressure compressed nitrogen gas is injected into the gas storage cavity of the accumulator cylinder through the gas charging valve.

[0007] Preferably, the double-accumulator type oil-gas spring integrated damping suspension hydraulic cylinder further comprises a steel ball; an installation groove is formed on one end of the piston rod of the suspension cylinder close to the installation cylinder bottom, the installation groove and the inner wall of the suspension cylinder barrel form an installation cavity, and the steel ball is placed in the installation cavity and moves along with the extension and retraction of the piston rod.

[0008] Preferably, the cylinder body of the accumulator is internally provided with a floating piston, and the floating piston can move according to the size difference of the oil-gas mixed pressure in the gas storage cavity and the oil storage cavity of the accumulator.

[0009] Preferably, the floating piston is provided with a double-AQ seal.

[0010] Preferably, the floating piston is further provided with a reverse St seal.

[0011] Preferably, the suspension cylinder is a plunger cylinder structure.

[0012] Preferably, a dust cover is mounted outside the suspension cylinder barrel.

[0013] The beneficial effects of the present application are that, compared with the prior art, the present application effectively solves the problem of pressure loss caused by the long oil circuit of the traditional suspension system, realizes internal transmission of the oil circuit through the integrated installation cylinder bottom, forms a redundant pressure compensation mechanism through the symmetrical layout of the double accumulators, and ensures the pressure stability of the system under continuous vibration conditions. The compact design of the overall structure reduces the space occupation and meets the miniaturization demand of the suspension system of special vehicles. The internal oil circuit direct connection eliminates the risk of external pipeline leakage and improves the system operation reliability.

[0014] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cross-sectional front view of the double-accumulator type oil-gas spring integrated damping suspension hydraulic cylinder of the present application; Figure 2 is a side view of the double-accumulator type oil-gas spring integrated damping suspension hydraulic cylinder of the present application.

[0016] Reference signs: 1, mounting hinge point; 2, joint bearing one; 3, accumulator front cavity oil port; 4, mounting cylinder bottom; 5, communication port two; 6, oil passage; 7, accumulator cylinder; 8, cylinder bottom oil port one; 9, communication port one; 10, thread; 11, suspension cylinder piston; 12, cylinder bottom oil port two; 13, reverse stef; 14, suspension cylinder cylinder; 15, AQ seal; 16, accumulator piston; 17, suspension cylinder piston rod; 18, dust cover; 19, accumulator cylinder bottom; 20, inflation valve one; 21, inflation valve two; 22, suspension cylinder guide sleeve; 23, joint bearing two; 24, ear ring hinge point; 25, steel ball. DETAILED DESCRIPTION

[0017] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout. The embodiments described below are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0018] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0019] Reference is made below to Figure 1 and Figure 2 A double-accumulator type oil-gas spring integrated damping suspension hydraulic cylinder is described in the embodiments of the present application.

[0020] A double-accumulator type oil-gas spring integrated damping suspension hydraulic cylinder is disclosed in the embodiments of the present application, comprising: a mounting cylinder bottom 4, a suspension cylinder, and an accumulator; the mounting cylinder bottom 4 has an oil passage 6 inside and is provided with one communication port one 9 and two communication port two 5; the suspension cylinder and the accumulator are both fixedly installed on the mounting cylinder bottom 4, the accumulator is provided with two groups, the two groups of accumulators are respectively located on the two sides in the radial direction of the suspension cylinder, the suspension cylinder and the accumulator are connected in communication with the oil passage 6 through the communication port one 9 and the communication port two 5, and the suspension cylinder and the accumulator are connected in communication through the oil passage 6.

[0021] The installation cylinder bottom 4 refers to a core connecting component of the suspension cylinder and the accumulator, and can adopt a casting or forging process to form an internal oil passage 6, which functions to replace the traditional external oil pipe and shorten the oil path transmission distance. The oil passage 6 refers to a fluid passage through the inside of the installation cylinder bottom 4, which can be formed by drilling or casting, and is used to establish a pressure transmission path between the suspension cylinder and the accumulator. The communication port one 9 refers to an interface connecting the suspension cylinder and the oil passage 6, which ensures that the suspension cylinder oil cavity is directly connected with the oil passage 6. The communication port two 5 refers to an interface connecting the accumulator and the oil passage 6, and each group of accumulators corresponds to one communication port two 5, which adopts a symmetrical distribution design to balance the pressure compensation. The two groups of accumulators refer to two independent energy storage units arranged symmetrically along the radial direction of the suspension cylinder, which can be fixed to the installation cylinder bottom 4 through threads 10 or flanges to form a double pressure compensation source.

[0022] Specifically, the installation cylinder bottom 4 is an integrated carrier, and the internal oil passage 6 directly connects the suspension cylinder oil cavity with the oil paths of the two accumulators. When the suspension cylinder is compressed under load, the oil enters the oil passage 6 through the communication port one 9, and is simultaneously divided into two parts to the communication port two 5 of the two accumulators. The symmetrical layout of the double accumulators forms a parallel compensation structure, which synchronously adjusts the oil and gas volume during pressure fluctuation, and maintains the balance of system pressure. The oil passage 6 replaces the traditional external pipe, shortens the oil transmission path, and reduces the pressure loss along the way. The installation cylinder bottom 4 is rigidly connected with each component, eliminating the vibration leakage risk existing in the traditional pipe connection. When one side of the accumulator fails, the other side can still independently complete the pressure compensation, ensuring the continuous and stable operation of the system.

[0023] Compared with the prior art, the traditional scheme needs to separately arrange the suspension cylinder and the accumulator, and the connection through the external pipe leads to an excessively long oil path and significant pressure loss. The internal oil path of the integrated installation cylinder bottom 4 is directly connected in the present scheme, the oil transmission path is shortened, and the pressure loss is reduced. The traditional single accumulator structure is prone to compensation lag under severe vibration conditions, and the parallel design of the double accumulators in the present scheme forms a double pressure source, and the compensation response speed is improved. The split structure needs additional installation space to arrange the pipe, and the three-in-one structure of the present scheme reduces the space occupation and is suitable for special vehicle chassis with limited space.

[0024] Through the above technical scheme, the present application effectively solves the problem of pressure loss caused by the long oil path of the traditional suspension system, and realizes the internal transmission of the oil path through the integrated installation cylinder bottom 4. The symmetrical layout of the double accumulators forms a redundant pressure compensation mechanism, which ensures the pressure stability of the system under continuous vibration conditions. The compact design of the overall structure reduces the space occupation, meets the miniaturization demand of the suspension system of special vehicles. The internal oil path direct connection eliminates the leakage risk of the external pipe, and improves the system operation reliability.

[0025] In some embodiments, for example Figure 1 and Figure 2As shown, cylinder bottom port 1 (8) and cylinder bottom port 2 (12) are radially arranged on the mounting cylinder bottom 4. Cylinder bottom port 1 (8) and cylinder bottom port 2 (12) are spaced apart. Transmission oil is injected into the oil passage 6 through cylinder bottom port 1 (8) and cylinder bottom port 2 (12) and further fills the inner cavity of the suspension cylinder barrel 14. Cylinder bottom port 1 (8) refers to the first oil injection channel located on the radial surface of the mounting cylinder bottom 4. Cylinder bottom port 2 (12) refers to the second oil injection channel symmetrically arranged with cylinder bottom port 1 (8).

[0026] Specifically, when transmission oil is injected simultaneously through two symmetrically distributed ports, two independent flow paths are formed within the oil passage 6. After the oil enters the main channel along the two branches of the cross-shaped flow channel, a counter-current mixing effect is generated in the confluence area. This bidirectional filling method causes the oil to form a circulating motion within the inner cavity of the suspension cylinder barrel 14, effectively eliminating the vortex dead zones caused by single-point oil injection. The phase difference filling mode formed by the spaced arrangement of the ports can avoid concentrated oil impact on specific areas of the cylinder barrel inner wall, effectively improving the uniformity of oil film coverage. During the filling process, the parallel operation of the two ports significantly increases the amount of oil injected per unit time.

[0027] Compared to existing technologies, traditional suspension hydraulic cylinders typically employ a single central port design, resulting in a linear flow of hydraulic fluid in a single direction and causing lag in filling the distal region of the cylinder. This solution utilizes a bidirectional filling path formed by two ports, enabling simultaneous axial and radial diffusion of the hydraulic fluid within the cylinder, significantly shortening the filling time. The friction loss caused by the extended oil path in existing single-port structures is decomposed into the local resistance of two parallel oil paths in this solution, effectively reducing the total pressure loss.

[0028] Through the above technical solution, this application achieves efficient filling and uniform distribution of transmission oil. The dual-port structure significantly improves filling efficiency and also enhances the uniformity of oil distribution. The pressure loss coefficient is also significantly reduced, effectively preventing premature seal failure caused by local pressure overload. The stable laminar flow state of the oil within the cylinder effectively improves the smoothness of piston movement.

[0029] In some embodiments, for example Figure 1 As shown, an inflation valve is installed on the side of the accumulator facing away from the mounting cylinder bottom 4. High-pressure compressed nitrogen is injected into the gas storage chamber of the accumulator cylinder 7 through the inflation valve. The inflation valve is a valve device that allows unidirectional injection of high-pressure gas. Specifically, it can be implemented using a threaded interface valve 10 with a unidirectional sealing structure, such as a conical sealing valve core structure with spring preload. This device ensures stable pressure within the gas storage chamber by restricting the reverse flow path of the gas. The gas storage chamber refers to the sealed space within the accumulator cylinder 7 used to store high-pressure compressed nitrogen. The inflation valve on one side of the accumulator is inflation valve 20, and the inflation valve on the other side is inflation valve 21.

[0030] Specifically, the charging valve is integrated at the end of the accumulator cylinder away from the mounting cylinder bottom 4, and its internal channel directly connects to the gas storage chamber. When nitrogen needs to be charged, an external gas source compresses the valve core spring force through the charging valve, pushing the valve core to open, and gas is injected axially into the gas storage chamber. After charging is completed, the spring force resets the valve core, and the valve core cone surface forms a sealing contact with the valve seat, preventing reverse gas leakage. Because the charging valve and the mounting cylinder bottom 4 are located at opposite ends of the accumulator, the oil passage and gas passage are completely isolated in space, avoiding the risk of oil-gas mixing. At the same time, the independent arrangement of the charging valve allows for individual maintenance or pressure testing without disassembling the accumulator.

[0031] Through the above technical solution, this application solves the problems of complex high-pressure nitrogen injection paths and low sealing reliability inside the accumulator. The directional charging valve structure ensures that gas can only be injected into the storage chamber along a preset path, while the conical sealing cooperation between the valve core and valve seat prevents reverse leakage. This design enables the accumulator to form a stable high-pressure gas source, providing a controllable gas chamber for dynamic compensation of the oil and gas pressure of the floating piston. Furthermore, the independent arrangement of the charging valve facilitates maintenance and avoids disassembling the entire accumulator assembly.

[0032] In some embodiments, for example Figure 1 As shown, the dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas spring also includes a steel ball 25; the piston rod of the suspension cylinder has an installation groove on one end near the bottom of the mounting cylinder 4, and the installation groove and the inner wall of the cylinder barrel 14 of the suspension cylinder form an installation cavity, in which the steel ball 25 is placed, and the steel ball 25 moves with the extension and retraction of the piston rod.

[0033] Here, steel ball 25 refers to a spherical metal component that serves as a damping element. It can be made of a high-hardness alloy material and is used to create a variable throttling effect in the oil flow path. The mounting groove is an annular groove located at the end of the piston rod. Its depth and width can be designed to match the dimensions of steel ball 25, limiting the range of movement of steel ball 25. The mounting cavity is a closed space enclosed by the mounting groove and the inner wall of the cylinder. Its axial length is slightly larger than the diameter of steel ball 25, allowing steel ball 25 to displace during piston rod movement.

[0034] Specifically, when the piston rod retracts under pressure, the hydraulic pressure pushes the steel ball 25 to move axially along the mounting cavity, forcing the hydraulic fluid into the small cavity of the suspension cylinder, increasing the pressure inside the cavity to slow down the piston rod's movement speed. When the load force decreases and the piston rod extends, the steel ball 25 changes the hydraulic fluid return path during the reset process, forming reverse throttling damping. The geometry of the mounting cavity is configured to allow the steel ball 25 to roll freely within a limited stroke, while the damping force is continuously adjusted through the dynamic change of the hydraulic fluid flow cross-sectional area.

[0035] Compared with existing technologies, traditional suspension systems often use fixed damping orifices or complex valve systems for buffering, which suffer from drawbacks such as slow response, complex structure, and susceptibility to clogging. This solution utilizes the autonomous displacement of the steel ball 25 within the mounting cavity to create an adaptive variable throttling effect, achieving dynamic damping adjustment without the need for external control devices. It also avoids the stringent requirements for oil cleanliness imposed by traditional valve systems.

[0036] Through the above technical solution, this application realizes dynamic damping adjustment of the suspension cylinder under impact load, effectively attenuating the hydraulic impact generated during piston rod movement. The mating structure between the steel ball 25 and the mounting cavity simplifies the complex valve group of traditional buffer devices and improves system reliability. The autonomous adjustment function of the oil flow path ensures stable buffering effect under high-frequency vibration conditions, solving the problem of insufficient shock absorption performance caused by the fixed damping structure in traditional suspension systems.

[0037] In some embodiments, for example Figure 1 As shown, a floating piston is installed inside the accumulator cylinder. This floating piston can move according to the pressure difference between the gas and oil mixtures in the gas and oil storage chambers of the accumulator. The floating piston is a movable separator located within the accumulator's internal cavity, with its outer diameter forming a clearance fit with the inner wall of the accumulator cylinder 7. This piston changes the volume ratio of the gas and oil storage chambers through axial movement, thereby balancing the pressure difference between the two chambers. The oil storage chamber is the hydraulic oil storage space within the accumulator that communicates with the suspension cylinder. The pressure in this chamber dynamically changes with the movement of the suspension cylinder, driving the piston to produce compensating displacement. Pressure difference-driven movement refers to the thrust generated by the pressure imbalance between the gas and oil chambers acting on the piston end face.

[0038] Specifically, when the suspension cylinder is subjected to an impact load, the instantaneous increase in pressure in the oil reservoir will push the floating piston toward the gas reservoir, storing energy by compressing nitrogen; when the system pressure drops, the nitrogen expands and pushes the piston to move in the opposite direction, releasing the stored energy into the oil reservoir.

[0039] Through the above technical solution, this application achieves dynamic balance compensation of the internal pressure of the accumulator, which significantly reduces the pressure fluctuation amplitude of the suspension system when subjected to high-frequency impact loads.

[0040] In some embodiments, for example Figure 1 As shown, the floating piston is equipped with a double AQ seal 15 and a reverse st seal 13.

[0041] Among them, the double AQ seal 15 refers to an axial sealing assembly composed of two symmetrically arranged polyurethane sealing rings, specifically implemented using U-shaped cross-section sealing rings with pre-compression, whose elastic deformation capacity can adapt to dynamic clearance changes between the piston and cylinder. The reverse step seal 13 refers to a lip seal with a one-way self-tightening function, specifically made of rubber composite material with a metal skeleton, with its sealing lip facing the high-pressure chamber, and undergoing radial expansion when the pressure increases to achieve enhanced sealing.

[0042] Specifically, when a pressure difference arises between the accumulator's gas storage chamber and oil storage chamber, the floating piston slides axially along the cylinder. The double AQ seal 15 compensates for the clearance between the cylinder and piston through elastic deformation during piston movement, forming a primary sealing barrier on the low-pressure side. The reverse seal 13 undergoes lip deformation under high-pressure oil, and the contact pressure between the sealing surface and the cylinder inner wall increases non-linearly with increasing pressure, forming a secondary sealing barrier. The combination of these two sealing structures ensures the piston maintains an effective seal under bidirectional pressure fluctuations, preventing nitrogen from seeping into the oil or oil from mixing into the gas chamber.

[0043] Through the above technical solution, this application effectively prevents cross-leakage of oil and gas media inside the accumulator, maintains the independent stability of nitrogen pressure in the gas storage chamber and hydraulic oil pressure in the oil storage chamber, and ensures the continuous reliability of the pressure compensation function under long-term dynamic load.

[0044] In some embodiments, for example Figure 1 As shown, the suspension cylinder is a plunger cylinder structure. The plunger cylinder structure refers to the interconnected structure of the left and right chambers of the piston inside the suspension cylinder, ensuring consistent pressure between the front and rear chambers.

[0045] Specifically, the plunger cylinder structure automatically balances the pressure in the front and rear chambers of the suspension cylinder during oil flow by connecting the two chambers on both sides of the piston. When an external load is applied to the piston rod, the oil flows freely within the connected chamber. At this time, the pressure on both sides of the piston is equal, and the balance between the load force and the hydraulic force is achieved solely through the effective area difference between the piston rod and the cylinder barrel. Since the plunger cylinder does not require a piston sealing structure, the support ring only serves a guiding function, avoiding energy loss caused by seal friction. This structure also simplifies the internal oil passages of the cylinder, with oil pressure transmitted through a single connected chamber, reducing the complex flow channel design required for independent oil chambers in traditional double-acting cylinders.

[0046] Through the above technical solution, this application solves the problem of complex oil circuit layout caused by the independent oil chamber and sealing structure of traditional suspension cylinders, and simplifies the internal structure of the hydraulic cylinder. The interconnected cavity characteristic of the plunger cylinder enables automatic oil pressure balance, avoids interference from seal friction on load force balance, and improves the stability of the system under high-frequency loads. This structure further reduces the oil flow path length and reduces the impact of pressure fluctuations on load support.

[0047] In some embodiments, for example Figure 1 As shown, a dust cover 18 is installed on the outside of the cylinder barrel 14 of the suspension cylinder. The dust cover 18 is a protective structure covering the outer wall of the cylinder barrel, which can be implemented using a bellows-type telescopic structure, for example, made of rubber or polyurethane material, and fixedly connected to the end of the cylinder barrel by clamps or flanges. This structure can be folded or unfolded synchronously when the piston rod extends or retracts, avoiding interference with moving parts.

[0048] Specifically, the dust cover 18 is fixed to the end face of the suspension cylinder guide sleeve 22 by a ring-shaped buckle, and its corrugated structure extends axially along the cylinder barrel to near the lug hinge point. When the piston rod performs a telescoping motion, the pleated portion of the dust cover 18 can elastically deform with the displacement of the piston rod, always maintaining complete coverage of the outer wall of the cylinder barrel. During the movement of the mining vehicle, splashed mud or dust first contacts the outer surface of the dust cover 18, is physically blocked by it, and is then guided along the corrugated grooves to the bottom for discharge, avoiding direct contact with the cylinder barrel sealing area. This structure maintains its protective function without generating additional resistance to the piston rod's movement speed.

[0049] Through the above technical solution, this application effectively prevents the direct erosion of the cylinder outer surface by solid particles and liquid corrosive media in the external environment, and reduces the probability of abnormal wear of the seals caused by foreign object embedding. This structure can maintain the cleanliness of the mating surfaces of the cylinder and piston rod, prevent contaminants from entering the oil circulation system and causing blockage of the hydraulic valve group, and ensure the long-term stable operation of the damping force generating mechanism. Under the continuous operation conditions of mining vehicles, the protective function of the dust cover 18 can extend the maintenance cycle of the suspension cylinder and reduce downtime caused by contaminant intrusion.

[0050] In addition, the dual-energy accumulator type integrated damping suspension hydraulic cylinder of this application also has: a first joint bearing 2, a second joint bearing 23, an accumulator front chamber oil port 3, a suspension cylinder piston 11, an accumulator cylinder bottom 19, and a suspension cylinder guide sleeve 22.

[0051] The present invention also proposes a vehicle comprising a dual-energy storage type integrated damping suspension hydraulic cylinder with an air spring, an upper vehicle structure, and an lower vehicle structure as described in any of the above embodiments; the mounting hinge point 1 of the cylinder bottom 4 and the lug hinge point 24 of the suspension cylinder are respectively connected to the upper vehicle structure and the lower vehicle structure of the vehicle.

[0052] Among them, mounting hinge point 1 for mounting cylinder bottom 4 refers to the mechanical connection interface located at the bottom of the cylinder block, which can be implemented using a hinge pin and a spherical bearing to establish a rigid connection between the suspension system and the upper vehicle structure. Earring hinge point 24 refers to the annular connection structure located at the end of the piston rod 11 of the suspension cylinder, which can be implemented using an earring-type hinge device with a spherical bearing to accommodate the multi-degree-of-freedom motion trajectory of the lower vehicle structure. Upper and lower vehicle structure components refer to the load-bearing components between the vehicle chassis frame and the running gear, such as the frame longitudinal beams and wheel hub brackets, which transmit longitudinal loads through mechanical connections.

[0053] Specifically, when the mounting hinge point 1 of the hydraulic cylinder is fixedly connected to the upper structural component via a pin, it forms a rigid support point between the suspension system and the main frame. The lug hinge point 24 is connected to the lower structural component via a spherical bearing, allowing the suspension cylinder to adapt to the lateral sway of the wheels while bearing vertical loads. During vehicle operation, the impact force between the upper and lower structural components is transmitted to the suspension cylinder through mounting hinge point 1. The mixture of hydraulic oil and nitrogen creates elastic buffering, and the dual accumulators compensate for pressure fluctuations in real time through the cylinder bottom oil circuit. The spherical bearing design of the lug hinge point 24 enables the suspension cylinder to withstand off-center load moments, avoiding lateral force losses caused by traditional bushing connections. The integrated structure of the cylinder bottom and the suspension cylinder shortens the oil circuit length, improves pressure transmission efficiency, and reduces the space required for external piping.

[0054] In some specific embodiments, mounting hinge point 1 can be made of forged alloy steel, and the spherical bearing of the lug hinge point 24 can be a self-lubricating spherical bearing. The upper structural component is fixed to the frame with high-strength bolts, and the lower structural component is connected to the wheel hub bracket with a flange. The mounting angle of the hydraulic cylinder can be adjusted according to the vehicle chassis layout, for example, by using a vertical or inclined mounting method.

[0055] Compared to existing technologies, traditional vehicle suspension systems require separate accumulators, hydraulic cylinders, and connecting pipelines, resulting in significant space occupation and substantial oil pressure loss. This design integrates a dual accumulator and suspension cylinder at the cylinder bottom, eliminating the need for external pipeline connections and effectively reducing the overall structural volume. The hinge point design of the spherical bearing significantly improves lateral force resistance compared to traditional bushing connections and eliminates the need for regular lubrication maintenance. The pressure compensation mechanism of the dual accumulators enhances system pressure stability.

[0056] Through the above technical solution, this application achieves a compact layout of the vehicle suspension system within a limited space, effectively reducing the chassis height of special vehicles such as mining trucks and wide-body vehicles. The connection reliability of the upper and lower vehicle structural components is enhanced. The coordinated operation of the dual accumulators significantly shortens the pressure compensation response time, ensuring a significant improvement in the vehicle's shock absorption efficiency under rough road conditions.

[0057] The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas spring according to embodiments of the present invention, as well as other vehicle components and operations, are known to those skilled in the art and will not be described in detail here.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs, characterized in that, include: Install cylinder bottom, suspension cylinder and accumulator; The mounting cylinder bottom has an oil passage inside and one connecting port one and two connecting ports two are opened on the mounting cylinder bottom; the suspension cylinder and the accumulator are both fixedly installed on the mounting cylinder bottom. There are two sets of accumulators, and the two sets of accumulators are respectively located on both sides of the radial direction of the suspension cylinder. The suspension cylinder and the accumulator are connected to the oil passage through the connecting port one and the connecting port two, respectively.

2. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 1, characterized in that, The mounting cylinder bottom is provided with a cylinder bottom oil port one and a cylinder bottom oil port two in a radial direction. The cylinder bottom oil port one and the cylinder bottom oil port two are arranged separately. The transmission oil is injected into the oil passage through the cylinder bottom oil port one and the cylinder bottom oil port two and further filled into the inner cavity of the suspension cylinder barrel.

3. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 2, characterized in that, An inflation valve is provided on the side of the accumulator facing away from the bottom of the mounting cylinder, and high-pressure compressed nitrogen is injected into the gas storage chamber of the accumulator cylinder through the inflation valve.

4. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 2, characterized in that, It also includes a steel ball; the piston rod of the suspension cylinder has an installation groove on one end near the bottom of the mounting cylinder, the installation groove and the inner wall of the cylinder barrel of the suspension cylinder form an installation cavity, the steel ball is placed in the installation cavity, and the steel ball moves with the extension and retraction of the piston rod.

5. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 1, characterized in that, The accumulator has a floating piston inside its cylinder, which can move according to the pressure difference between the gas and oil mixture in the gas storage chamber and the oil storage chamber of the accumulator.

6. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 5, characterized in that, The floating piston is equipped with double AQ seals.

7. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 6, characterized in that, The floating piston is also equipped with a reverse seal.

8. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 1, characterized in that, The suspension cylinder is a plunger cylinder structure.

9. The dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas springs according to claim 2, characterized in that, The cylinder barrel of the suspension cylinder is equipped with a dust cover.

10. A vehicle, characterized in that, Includes the dual-energy storage type integrated damping suspension hydraulic cylinder with oil and gas spring as described in any one of claims 1-9, the upper vehicle structural component and the lower vehicle structural component; The mounting hinge point at the bottom of the mounting cylinder and the lug hinge point of the suspension cylinder are respectively connected to the upper and lower structural components of the vehicle.

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