Hydrocarbon suspension system and track-type engineering vehicle

Abstract

This invention relates to the field of suspension system technology for engineering vehicles, and discloses a hydropneumatic suspension system and a tracked engineering vehicle, including a front suspension cylinder, a middle suspension cylinder, a rear suspension cylinder, a front swing arm, a middle swing arm, a rear swing arm, a buffer cylinder, a tensioning cylinder, a brake arm, and an eccentric shaft; one end of each of the front, middle, and rear suspension cylinders is hinged to the vehicle frame, and the other end is hinged to the front, middle, and rear swing arms, respectively; a tensioning cylinder cylinder seat is fixedly connected to the rear of the cylinder barrel of the tensioning cylinder, and the cylinder barrel of the buffer cylinder is placed inside the tensioning cylinder cylinder seat, allowing it to swing within the tensioning cylinder cylinder seat; the piston rod end of the buffer cylinder is hinged to the brake arm; the piston rod end of the tensioning cylinder is hinged to the vehicle frame. The beneficial effects of this invention are: it can significantly attenuate the vibration generated during high-speed operation, improve the overall comfort of the vehicle, and ensure that the tracks are tensioned in real time during high-speed operation, preventing slippage and derailment, thus guaranteeing the vehicle's mobility and passability.

Description

Technical Field

[0001] This invention relates to the field of engineering vehicle suspension system technology, and specifically to an oil-gas suspension system and a tracked engineering vehicle. Background Technology

[0002] Tracked walkways are now widely used in engineering machinery and military vehicles, such as excavators, cranes, and tanks. The suspension system is a crucial component of a vehicle, connecting the vehicle body to the running gear. It dampens and absorbs vibrations and shocks generated during high-speed travel, ensuring vehicle stability and improving driving comfort. The quality of the suspension system directly determines the vehicle's operational and mobility performance.

[0003] Currently, most tracked engineering vehicles use spring-damped balance trolleys or semi-rigid rubber suspension systems. These structures are typically only suitable for slower tracked vehicles. Applying them to high-speed tracked engineering vehicles can easily lead to track slippage, track derailment, and an inability to adjust the overall vehicle's attitude or achieve rigid locking. Furthermore, while some tracked engineering vehicles are equipped with tension cylinders, their slow response time makes them unsuitable for high-speed applications. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an oil-gas suspension system and a tracked engineering vehicle, suitable for high-speed tracked engineering vehicles. It can significantly reduce the vibration generated when the machine is traveling at high speed, improve the overall comfort of the machine, and ensure that the tracks can be tensioned in real time during high-speed travel, preventing slippage and ensuring the mobility and passability of the machine.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention proposes a hydropneumatic suspension system, including a front suspension cylinder, a middle suspension cylinder, a rear suspension cylinder, a front control arm, a middle control arm, a rear control arm, a buffer cylinder, a tensioning cylinder, a brake arm, and an eccentric shaft. One end of each of the front, middle, and rear suspension cylinders is hinged to the vehicle frame, and the other end is hinged to the front, middle, and rear control arms, respectively. The tensioning cylinder has a tensioning cylinder seat fixedly connected to its cylinder barrel. The buffer cylinder's cylinder barrel is placed inside the tensioning cylinder seat and can swing within it. The piston rod end of the buffer cylinder is hinged to the brake arm. The piston rod end of the tensioning cylinder is hinged to the vehicle frame, and the brake arm, through its hinge to the tensioning cylinder seat, can swing around the hinge point. One end of the eccentric shaft is inserted into and fixedly connected to the tensioning cylinder seat, and the other end is connected to the front control arm, allowing it to rotate around the front control arm.

[0007] Preferably, the cylinder barrel of the tensioning cylinder is welded to the cylinder barrel seat of the tensioning cylinder.

[0008] In conjunction with the first aspect, further, when the suspension system is working, the tensioning cylinder and the rear suspension cylinder are in a connected state. That is, when the rear suspension cylinder extends, the tensioning cylinder retracts, and the vehicle equipped with the suspension system achieves track tensioning; when the tensioning cylinder extends, the rear suspension cylinder retracts, and the vehicle equipped with the suspension system can still achieve track tensioning.

[0009] In conjunction with the first aspect, the suspension system of the present invention further includes a locking valve assembly, which includes an electromagnetic locking valve and a manual locking valve. There are two electromagnetic locking valves: one end of the electromagnetic locking valve is connected to the tensioning cylinder, and the other end is connected to the rear suspension cylinder via the manual locking valve; one end of the other electromagnetic locking valve is connected to the rodless chamber of the front suspension cylinder, and the other end is connected to the fourth accumulator of the rodless chamber of the front suspension cylinder via the manual locking valve; a third filling valve 28 is provided between the rear suspension cylinder and the tensioning cylinder.

[0010] Preferably, the electromagnetic locking valve is a two-position two-way valve, and the manual locking valve is a two-position four-way valve.

[0011] In conjunction with the first aspect, the suspension system of the present invention further includes a suspension control valve, which is connected to the rod chamber of the front suspension cylinder and is also connected to the rodless chamber of the front suspension cylinder through a locking valve assembly; the suspension control valve is used to fill the front suspension cylinder with fluid to adjust the vehicle posture in order to adapt to different working conditions.

[0012] In conjunction with the first aspect, the rod chamber of the front suspension cylinder is further connected to the fourth filling valve, and the rodless chamber of the front suspension cylinder is connected to the fifth filling valve.

[0013] In conjunction with the first aspect, the buffer cylinder is further connected to the second filling valve.

[0014] In conjunction with the first aspect, the central suspension cylinder is further connected to the first filling valve.

[0015] In conjunction with the first aspect, furthermore, a contact switch is provided on the front suspension cylinder. The contact switch acts as a limit switch. When the overall machine posture needs to be lowered, the hydraulic pump fills the rod chamber of the front suspension cylinder with fluid through the suspension control valve, and the rodless chamber of the front suspension cylinder returns oil, thus lowering the posture. When the contact switch is touched, the suspension control valve stops filling the front suspension cylinder with fluid, and the lowering process ends. When the overall machine posture needs to be raised, the working pump fills the rodless chamber of the front suspension cylinder with fluid through the suspension control valve, the cylinder rod of the front suspension cylinder extends, and the overall machine posture is raised.

[0016] In conjunction with the first aspect, the suspension system of the present invention further includes a first accumulator, a second accumulator, and a third accumulator. The first accumulator is connected to a buffer cylinder, the second accumulator is connected to a central suspension cylinder, and the third accumulator is connected to a tension cylinder and a rear suspension cylinder. These accumulators serve to reduce vibration.

[0017] In conjunction with the first aspect, further comprising a fourth accumulator and a fifth accumulator, wherein the fourth accumulator is connected to the rodless chamber of the front suspension cylinder and the fifth accumulator is connected to the rod chamber of the front suspension cylinder, such an arrangement can provide a set back pressure during the lifting and lowering of the entire machine, thereby enhancing the stability of the machine's attitude adjustment.

[0018] In conjunction with the first aspect, the fourth, fifth, and second accumulators are all piston-type accumulators; the third accumulator shared by the tensioning cylinder and the rear suspension cylinder is a bladder-type accumulator; and the first accumulator is also a bladder-type accumulator.

[0019] In conjunction with the first aspect, the axes of the front suspension cylinder, the middle suspension cylinder, and the rear suspension cylinder intersect at a single point, so that the upper ends of the front, middle, and rear cylinders are arranged near the longitudinal center area to maintain the stability of the vehicle when traversing irregular terrain.

[0020] In conjunction with the first aspect, furthermore, the pistons of the rear suspension cylinder and the tensioning cylinder are provided with several damping holes. The setting of these damping holes connects the rod chamber and the rodless chamber of the two cylinders, absorbing the energy generated by the vibration of the vehicle body and playing a shock absorption role. Compared with the external pipeline connection, its damping is smaller.

[0021] In conjunction with the first aspect, the pistons of the buffer cylinder and the intermediate suspension cylinder are also provided with several damping holes, which have the same function as described above.

[0022] In conjunction with the first aspect, the tensioning cylinder is further described as a plunger cylinder, with its cylinder barrel and cylinder rod configured as a stepped structure that matches each other. The cylinder rod is a hollow structure and has a damping hole on it. The configuration of the damping hole and the hollow structure of the cylinder rod also enable the large and small chambers of the tensioning cylinder to communicate with each other. When the tensioning cylinder moves, it absorbs the energy generated by the vibration of the vehicle body and plays a role in shock absorption.

[0023] In conjunction with the first aspect, further, the tensioning cylinder cylinder seat is provided with a buffer cylinder mounting seat, an eccentric shaft mounting hole and a brake arm mounting hole in sequence. The buffer cylinder mounting seat is connected to the cylinder of the buffer cylinder, the eccentric shaft is matched with the eccentric shaft mounting hole, and the brake arm mounting hole is hinged to the hinge point on the brake arm.

[0024] The tensioning cylinder of this invention has a structure that can handle the tensioning force on the tracks during high-speed travel.

[0025] Secondly, this invention proposes a tracked engineering vehicle, including the aforementioned suspension system, tracks, guide wheels, drive wheels, and a fifth road wheel; the drive wheels drive the entire vehicle to move via the tracks, the brake is mounted on the brake arm, and guide wheels are mounted on both sides of the brake. Since the entire machine is friction-driven, the brake brakes the guide wheels to achieve vehicle braking; it also includes two sets of road wheel supports, namely a first road wheel support and a second road wheel support. The first road wheel support is hinged to the brake arm and the cylinder rod end of the buffer cylinder via a pin; the second road wheel support is connected to the central suspension cylinder via a central swing arm; and the fifth road wheel is connected to the rear suspension cylinder via a rear swing arm.

[0026] In conjunction with the second aspect, further, each set of load-bearing wheel brackets is independent, with two load-bearing wheels on each side of each set of load-bearing wheel brackets, for a total of four load-bearing wheels. For example, the first load-bearing wheel bracket has one first load-bearing wheel and one second load-bearing wheel on each side of each side, and the second load-bearing wheel bracket has one third load-bearing wheel and one fourth load-bearing wheel on each side of each side; the first to fifth load-bearing wheels are all follower wheels.

[0027] In conjunction with the second aspect, furthermore, the track is a rubber track.

[0028] The suspension system of this invention is applicable to the field of tracked engineering vehicles, such as bulldozers in construction machinery and tracked tractors in agricultural machinery.

[0029] Compared with the prior art, the present invention provides an oil-gas suspension system and a tracked engineering vehicle, which have the following beneficial effects:

[0030] (1) The suspension system of the present invention is based on a high-speed tracked engineering vehicle, which can significantly reduce the vibration generated when the whole machine is traveling at high speed, improve the comfort of the whole machine, and the track can be tensioned in real time when traveling at high speed, without slipping or slipping, thus ensuring the mobility and passability of the whole machine.

[0031] (2) In the suspension system of the present invention, the locking valve group includes a solenoid valve and a manual valve under working conditions, which can realize rigid locking of different operations, so that the suspension system can be rigidly locked, increasing the rigidity of the whole machine and improving the working efficiency and performance.

[0032] (3) The suspension system of the present invention is symmetrically arranged on the left and right; the axes of the front suspension, middle suspension and rear suspension cylinders intersect at one point, the front, middle and rear suspension systems are independent of each other, and the upper ends of the front, middle and rear cylinders are arranged near the longitudinal center area so as to maintain the stability of the whole vehicle when crossing irregular terrain.

[0033] (4) The suspension system of the present invention is equipped with a filling valve, which can be connected to an external oil source to adjust the oil pressure of the suspension system. The operation is simple and reliable.

[0034] (5) In the suspension system of the present invention, the pistons of the buffer cylinder, tension cylinder, middle suspension cylinder and rear suspension cylinder are all provided with damping holes, so that the rod chamber and rodless chamber of the cylinder are connected. Compared with the external pipeline connection, the damping is small and the impact resistance is strong.

[0035] (6) The suspension system of the present invention allows for smooth adjustment of the vehicle's posture according to different requirements;

[0036] (7) The tracked engineering vehicle of the present invention uses the suspension system of the present invention to support the weight of the whole vehicle, absorb the vibration and impact generated during high-speed driving, increase the traction of the whole machine, and improve the smoothness and reliability of the vehicle under high-speed driving conditions.

[0037] (8) In the tracked engineering vehicle of the present invention, each load wheel can rotate with the corresponding swing arm, and each suspension cylinder can extend and retract with the corresponding swing arm, thereby playing a shock absorption role and enabling the tracked engineering vehicle to travel at high speed on rugged roads. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the suspension system of the present invention;

[0039] Figure 2 A partial rear-view perspective view of the suspension system of the present invention;

[0040] Figure 3 This is a schematic diagram of the suspension system of the present invention;

[0041] Figure 4 This is a schematic diagram of the buffer cylinder in this invention;

[0042] Figure 5 This is a schematic diagram of the suspension cylinder in this invention;

[0043] Figure 6 This is a schematic diagram of the main view structure of the pistons of each cylinder in the suspension system of the present invention, excluding the front suspension cylinder.

[0044] Figure 7 This is a schematic diagram of the tensioning cylinder in the suspension system of the present invention;

[0045] Figure 8 This is a cross-sectional view of the tensioning cylinder in the suspension system of the present invention.

[0046] The meanings of the reference numerals in the diagram are as follows: 1-Idler wheel; 2, 44, 45, 46-Pin shaft; 3-Buffer cylinder; 4-First road wheel; 5-Brake arm; 6-First road wheel bracket; 7-Second road wheel; 8-Tension cylinder; 9-Middle swing arm; 10-Third road wheel; 11-Second road wheel bracket; 12-Fourth road wheel; 13-Rear swing arm; 14-Fifth road wheel; 15-Track; 16-Drive wheel; 17-Frame; 18-Rear suspension cylinder; 19-Middle suspension cylinder; 20-Front suspension cylinder; 21-Front swing arm; 22-... - Eccentric shaft; 23- First accumulator; 24- First filling valve; 25- Second accumulator; 26- Third accumulator; 27- Second filling valve; 28- Third filling valve; 29- Electromagnetic lock valve; 30- Manual lock valve; 31- Lock valve assembly; 32- Fourth accumulator; 33- Fifth accumulator; 34- Fourth filling valve; 35- Fifth filling valve; 36, 42- Damping holes; 37- Tensioning cylinder seat; 38- Buffer cylinder mounting seat; 39- Eccentric shaft mounting hole; 40- Brake arm mounting hole; 41- Tensioning cylinder barrel; 43- Tensioning cylinder rod. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0050] like Figure 1 and Figure 2 As shown, this invention proposes a hydropneumatic suspension system, including a front suspension cylinder 20, a middle suspension cylinder 19, a rear suspension cylinder 18, a front control arm 21, a middle control arm 9, a rear control arm 13, a buffer cylinder 3, a tensioning cylinder 8, a brake arm 5, and an eccentric shaft 22; one end of the front suspension cylinder 20, the middle suspension cylinder 19, and the rear suspension cylinder 18 are hinged to the vehicle frame 17, and the other end is hinged to the front control arm 21, the middle control arm 9, and the rear control arm 13, respectively; a tensioning cylinder cylinder seat is fixedly connected to the rear of the cylinder barrel of the tensioning cylinder 8. 37. The cylinder of the buffer cylinder 3 is placed inside the tension cylinder cylinder seat 37 and can swing within the tension cylinder cylinder seat 37. The cylinder rod end of the buffer cylinder 3 is hinged to the brake arm 5. The cylinder rod end of the tension cylinder 8 is hinged to the frame 17 via the pin 46. The brake arm 5 is hinged to the tension cylinder cylinder seat 37 and can swing around the hinge point. One end of the eccentric shaft 22 is inserted into the tension cylinder cylinder seat 37 and fixedly connected to the tension cylinder cylinder seat 37. The other end is connected to the front swing arm 21 and can rotate around the front swing arm 21.

[0051] Preferably, the cylinder barrel of the tensioning cylinder 8 is welded to the cylinder barrel seat 37 of the tensioning cylinder.

[0052] In one specific embodiment of this example, the cylinder end of the front suspension cylinder 20 is hinged to the frame 17 via a pin 44, and the cylinder rod end of the front suspension cylinder 20 is hinged to the front control arm 21 via a pin 45.

[0053] In one specific implementation of this embodiment, such as Figure 3As shown, the suspension system of the present invention also includes a locking valve assembly 31, which includes an electromagnetic locking valve 29 and a manual locking valve 30. There are two electromagnetic locking valves 29. One end of one electromagnetic locking valve 29 is connected to the tensioning cylinder 8, and the other end is connected to the rear suspension cylinder 18 through the manual locking valve 30. This arrangement allows the track to relax when the tensioning cylinder 8 retracts to absorb impact, and the piston rod of the rear suspension cylinder 18 extends, tensioning the track. When crossing an obstacle, the tensioning cylinder 8 extends, the rear suspension cylinder 18 retracts, and the track is tensioned. One end of the other electromagnetic locking valve 29 is connected to the rodless chamber of the front suspension cylinder 20, and the other end is connected to the fourth accumulator 32 of the rodless chamber of the front suspension cylinder 20 and the suspension control valve via the manual locking valve 30. A third filling valve 28 is provided between the electromagnetic locking valve 29 and the tensioning cylinder 8.

[0054] The working principle of real-time track tensioning in this invention is as follows:

[0055] When the vehicle is stationary, fluid is injected into the tension cylinder 8 through the third filling valve 28, bringing the tension cylinder 8 to the calibrated pressure and tensioning the tracks. When the vehicle is moving, the locking valve assembly 31 opens, connecting the tension cylinder 8 to the rear suspension cylinder 18. When the fifth road wheel 14 encounters an obstacle, the rear suspension cylinder 18 retracts as the fifth road wheel 14 is lifted, while the tension cylinder 8 extends, tensioning the tracks. After the fifth road wheel 14 passes the obstacle, the rear suspension cylinder 18 extends, the tension cylinder 8 retracts, and the tracks are tensioned.

[0056] In one specific embodiment of this example, the electromagnetic locking valve 29 is a two-position two-way valve, and the manual locking valve 30 is a two-position four-way valve.

[0057] In one specific embodiment of this invention, the suspension system further includes a suspension control valve, which is connected to the rod chamber of the front suspension cylinder 20. The suspension control valve is also connected to the rodless chamber of the front suspension cylinder 20 through a locking valve assembly 31. The suspension control valve is used to fill the front suspension cylinder 20 with fluid to adjust the vehicle posture in order to adapt to different working conditions.

[0058] In one specific implementation of this embodiment, such as Figure 3 As shown, the rod chamber of the front suspension cylinder 20 is also connected to the fourth filling valve 34, and the rodless chamber of the front suspension cylinder 20 is also connected to the fifth filling valve 35.

[0059] In one specific implementation of this embodiment, such as Figure 4 and Figure 5 As shown, the buffer cylinder 3 is connected to the second filling valve 27; the central suspension cylinder 19 is connected to the first filling valve 24.

[0060] In one specific embodiment of this example, a contact switch is provided on the front suspension cylinder 20. The contact switch acts as a limit switch, stopping the descent when the entire machine touches the contact switch during descent.

[0061] The working principle of vehicle posture adjustment in this invention is as follows:

[0062] The vehicle's posture is adjusted by filling the front suspension cylinder 20 with fluid through the suspension control valve to adapt to different working conditions. The specific process is as follows: When the locking valve group 31 is opened, and the vehicle needs to descend, the working pump fills the rod chamber of the front suspension cylinder 20 with fluid through the suspension control valve, while the rodless chamber of the front suspension cylinder 20 returns oil, lowering the vehicle's posture. Descending stops when the contact switch is triggered. When the vehicle needs to rise, the working pump fills the rodless chamber of the front suspension cylinder 20 with fluid through the suspension control valve, extending the cylinder rod of the front suspension cylinder 20, raising the vehicle's posture. Simultaneously, when the vehicle's posture changes, the accumulators (including the fifth accumulator 33 and the fourth accumulator 32) connected to the large and small chambers of the front suspension cylinder 20 provide a certain back pressure to ensure the stability of the posture adjustment. A contact switch is also installed on the front suspension cylinder 20, which automatically stops the vehicle when it descends to the designated position.

[0063] In one specific embodiment of this example, during the process of raising the overall posture of the machine, the oil intake of the rodless chamber of the front suspension cylinder 20 is controlled by the suspension control valve to adjust the height of the machine's ascent.

[0064] In one specific embodiment of this invention, the suspension system of the present invention further includes a first accumulator 23, a second accumulator 25, a third accumulator 26, a fourth accumulator 32, and a fifth accumulator 33. The first accumulator 23 is connected to the buffer cylinder 3, the second accumulator 25 is connected to the middle suspension cylinder 19, and the third accumulator 26 is connected to the tension cylinder 8 and the rear suspension cylinder 18. These accumulators play a role in vibration reduction. The fourth accumulator 32 is connected to the rodless chamber of the front suspension cylinder 20, and the fifth accumulator 33 is connected to the rod chamber of the front suspension cylinder 20. This arrangement also has a vibration reduction effect, enhancing the stability of the overall machine attitude adjustment.

[0065] In one specific embodiment of this example, the fourth accumulator 32, the fifth accumulator 33, and the second accumulator 25 are all piston-type accumulators; the third accumulator 26, which is shared by the tension cylinder 8 and the rear suspension cylinder 18, is a bladder-type accumulator; and the first accumulator 23 is also a bladder-type accumulator.

[0066] In one specific embodiment of this example, the axes of the front suspension cylinder 20, the middle suspension cylinder 19, and the rear suspension cylinder 18 intersect at a single point, so that the upper ends of the front, middle, and rear cylinders are arranged near the longitudinal center area to maintain the stability of the vehicle when traversing irregular terrain.

[0067] In one specific implementation of this embodiment, such as Figure 2 and Figure 6 As shown, the pistons of the rear suspension cylinder 18 and the tensioning cylinder 8 are provided with damping holes 36. The damping holes 36 connect the rod chamber and the rodless chamber of the two cylinders, absorbing the energy generated by the vibration of the vehicle body and playing a shock absorption role. Compared with the external pipeline connection, its damping is smaller.

[0068] In one specific embodiment of this example, the pistons of the buffer cylinder 3 and the intermediate suspension cylinder 19 are also provided with several damping holes 36.

[0069] In one specific implementation of this embodiment, such as Figure 7 and Figure 8 As shown, the tensioning cylinder 8 is a plunger cylinder, with its cylinder barrel and cylinder rod configured as a stepped structure that matches each other. The cylinder rod is a hollow structure and has a damping hole 42 on it. The configuration of the tensioning cylinder barrel 41 and the tensioning cylinder rod 43 as a stepped structure that matches each other enables the large and small chambers of the tensioning cylinder 8 to communicate. The setting of the damping hole 42 and the hollow structure of the tensioning cylinder rod 43 also enable the large and small chambers of the tensioning cylinder 8 to communicate. When the tensioning cylinder 8 moves, it absorbs the energy generated by the vibration of the vehicle body and plays a role in shock absorption.

[0070] In one specific embodiment of this example, the tensioning cylinder cylinder seat 37 is provided with a buffer cylinder mounting seat 38, an eccentric shaft mounting hole 39, and a brake arm mounting hole 40 in sequence. The buffer cylinder mounting seat 38 is connected to the cylinder of the buffer cylinder 3, the eccentric shaft 22 is matched with the eccentric shaft mounting hole 39, and the brake arm mounting hole 40 is hinged to the hinge point on the brake arm 5.

[0071] In one specific embodiment of this example, the cylinder barrel of the buffer cylinder 3 is provided with two circular protrusions on both sides, which fit perfectly into the buffer cylinder mounting base 38.

[0072] The present invention also proposes a tracked engineering vehicle, including the aforementioned suspension system, track 15, idler wheel 1, drive wheel 16, and fifth road wheel 14; the drive wheel 16 drives the vehicle to move through the track 15, the brake is mounted on the brake arm 5, and idler wheels 1 are mounted on both sides of the brake. Since the whole machine is friction-driven, the brake brakes the idler wheels 1 to achieve vehicle braking; it also includes two sets of road wheel brackets, namely the first road wheel bracket 6 and the second road wheel bracket 11. The first road wheel bracket 6 is hinged to the brake arm 5 and the cylinder rod end of the buffer cylinder 3 through the pin 2; the second road wheel bracket is connected to the middle suspension cylinder 19 through the middle swing arm 9; the fifth road wheel 14 is connected to the rear suspension cylinder 18 through the rear swing arm 13.

[0073] In one specific embodiment of this example, each set of load-bearing wheel brackets is independent, and each set of load-bearing wheel brackets has two load-bearing wheels on each side, for a total of four load-bearing wheels. For example, the first load-bearing wheel bracket 6 has one first load-bearing wheel 4 and one second load-bearing wheel 7 on each side, and the second load-bearing wheel bracket 11 has one third load-bearing wheel 10 and one fourth load-bearing wheel 12 on each side; the first load-bearing wheel 4 to the fifth load-bearing wheel 14 are all follower wheels.

[0074] In one specific embodiment of this example, the track 15 is a rubber track 15.

[0075] The working principle of the rigid locking mechanism in this invention is as follows:

[0076] When the machine is in operation, the solenoid directional valve 29 is closed, and the tension cylinder 8, rear suspension cylinder 18, and front suspension cylinder 20 are simultaneously locked, putting the entire machine in a rigidly locked state. This maintains the stability of the machine body, improves operational stability, and ensures good operational efficiency. The manual locking valve 30 can also be operated to achieve rigid locking of the entire machine.

[0077] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A hydropneumatic suspension system, characterized in that: The system includes a front suspension cylinder, a center suspension cylinder, a rear suspension cylinder, a front control arm, a center control arm, a rear control arm, a buffer cylinder, a tensioning cylinder, a brake arm, and an eccentric shaft. One end of each of the front, center, and rear suspension cylinders is hinged to the vehicle frame, and the other end is hinged to the front, center, and rear control arms, respectively. A tensioning cylinder cylinder seat is fixedly connected to the rear of the tensioning cylinder's barrel. The buffer cylinder's barrel is placed inside the tensioning cylinder cylinder seat and can swing within it. The piston rod end of the buffer cylinder is hinged to the brake arm. The piston rod end of the tensioning cylinder is hinged to the vehicle frame, and the brake arm is hinged to the tensioning cylinder cylinder seat, allowing it to swing around the hinge point. One end of the eccentric shaft is inserted into and fixedly connected to the tensioning cylinder cylinder seat, and the other end is connected to the front control arm, allowing it to rotate around the front control arm. When a vehicle equipped with the suspension system is in motion, the tension cylinder and the rear suspension cylinder are in a connected state. That is, when the rear suspension cylinder extends, the tension cylinder retracts, and the vehicle equipped with the suspension system achieves track tension; when the tension cylinder extends, the rear suspension cylinder retracts, and the vehicle equipped with the suspension system can still achieve track tension. It also includes a locking valve assembly, which includes an electromagnetic locking valve and a manual locking valve. There are two electromagnetic locking valves. One electromagnetic locking valve is connected at one end to the tensioning cylinder and at the other end to the rear suspension cylinder via the manual locking valve. The other electromagnetic locking valve is connected at one end to the rodless chamber of the front suspension cylinder and at the other end to the manual locking valve. A third filling valve is provided between the rear suspension cylinder and the tensioning cylinder. The pistons of the rear suspension cylinder and the tensioning cylinder are provided with several damping holes; The tensioning cylinder is a plunger cylinder, with its cylinder barrel and cylinder rod configured as a stepped structure that matches each other. The cylinder rod is a hollow structure and has a damping hole on it.

2. The hydropneumatic suspension system according to claim 1, characterized in that: It also includes a suspension control valve, which is connected to the rod chamber of the front suspension cylinder, and the suspension control valve is also connected to the rodless chamber of the front suspension cylinder through a locking valve assembly.

3. The hydropneumatic suspension system according to claim 1, characterized in that: It also includes a first accumulator, a second accumulator, and a third accumulator. The first accumulator is connected to the buffer cylinder, the second accumulator is connected to the central suspension cylinder, and the third accumulator is connected to the tension cylinder and the rear suspension cylinder.

4. The hydropneumatic suspension system according to claim 1, characterized in that: It includes a fourth accumulator and a fifth accumulator. The fourth accumulator is connected to the rodless chamber of the front suspension cylinder, and the fifth accumulator is connected to the rod chamber of the front suspension cylinder.

5. The hydropneumatic suspension system according to claim 1, characterized in that: The axes of the front suspension cylinder, the middle suspension cylinder, and the rear suspension cylinder intersect at a single point.

6. The hydropneumatic suspension system according to claim 1, characterized in that: The tensioning cylinder cylinder seat is provided with a buffer cylinder mounting seat, an eccentric shaft mounting hole and a brake arm mounting hole in sequence. The buffer cylinder mounting seat is connected to the cylinder of the buffer cylinder. The eccentric shaft is matched with the eccentric shaft mounting hole. The brake arm mounting hole is hinged to the hinge point on the brake arm.

7. A tracked engineering vehicle, characterized in that: The system includes the suspension system, track, idler wheel, drive wheel, and fifth road wheel as described in any one of claims 1-6; the drive wheel drives the vehicle to move via the track, the brake is mounted on the brake arm, and idler wheels are mounted on both sides of the brake; it also includes two sets of road wheel supports, namely a first road wheel support and a second road wheel support, the first road wheel support being hinged to the brake arm and the cylinder rod end of the buffer cylinder via a pin; the second road wheel support being connected to the central suspension cylinder via a central swing arm; and the fifth road wheel being connected to the rear suspension cylinder via a rear swing arm.

Images