Damping and buffering oil cylinder and reach forklift

Abstract

The utility model provides a shock-absorbing buffer oil cylinder and reach truck, including cylinder barrel, piston, piston rod and sealing end cover, the cylinder barrel is equipped with first oil inlet and second oil inlet, the sealing end cover is installed in the opening end of cylinder barrel, the piston is installed in the cylinder barrel, one end of piston rod is connected with piston, the other end of piston rod is connected with the piston, and the other end of piston rod is connected with the sealing end cover. One end of the piston rod is connected with the cylinder barrel, the other end of the piston penetrates through the sealing end cover and extends to the outside of the cylinder barrel, the piston divides the internal space of the cylinder barrel into two cavities, the side where the piston rod is located is a rod cavity, and the other side of the piston rod is a rodless cavity; the hydraulic cylinder further comprises a damping and buffering structure arranged in the cylinder barrel, and specifically comprises a first buffering piece arranged in the rod cavity and a second buffering piece arranged in the rodless cavity. By arranging the damping and buffering structure in the cylinder barrel, impact force generated by movement of the portal can be effectively absorbed, vibration of the forklift in the operation process is reduced, and therefore the overall stability of the forklift is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a shock-absorbing and buffering oil cylinder and a reach forklift truck. Background Art

[0002] During the operation of a forklift truck, the stability and safety of the mast system are extremely crucial, which are directly related to the efficiency of cargo handling and the safety of the operator. The shock-absorbing and buffering oil cylinder plays a vital role in ensuring the stability of the mast operation. Its design purpose is that when the mast performs operations such as forward tilting, it can significantly reduce the action impact force generated thereby, not only protecting the cargo from damage but also preventing possible damage to the vehicle structure due to excessive impact force.

[0003] However, traditional shock-absorbing and buffering oil cylinders mainly rely on hydraulic damping to achieve the shock-absorbing effect. This single shock-absorbing mechanism may be inadequate when encountering a large impact force. For example, when driving on an uneven road surface, the fork reaches the limit position, or the forklift truck stops suddenly, relying solely on hydraulic damping may not be able to fully absorb the impact force generated by the mast action. In these cases, the cargo may experience unstable shaking during handling, which not only increases the risk of cargo damage but also reduces the safety and stability of forklift truck operation. Therefore, in order to improve the overall performance of the forklift truck, it is necessary to improve the shock-absorbing and buffering oil cylinder to achieve a more effective shock-absorbing and buffering effect. Summary of the Utility Model

[0004] In order to solve all or part of the above-mentioned problems of the prior art, the utility model provides a shock-absorbing and buffering oil cylinder and a reach forklift truck. By arranging a shock-absorbing and buffering structure inside the cylinder barrel, it can effectively absorb the impact force generated by the mast action, reduce the vibration during the operation of the forklift truck, and thus improve the overall stability of the forklift truck.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] A shock-absorbing and buffering oil cylinder, comprising a cylinder barrel, a piston, a piston rod and a sealing end cover. The cylinder barrel is provided with a first oil inlet and a second oil inlet. The sealing end cover is installed at the open end of the cylinder barrel. The piston is installed inside the cylinder barrel. One end of the piston rod is connected to the piston, and the other end extends outside the cylinder barrel through the sealing end cover. The piston divides the inner space of the cylinder barrel into two chambers. The side where the piston rod is located is the rod chamber, and the other side is the rodless chamber. It further includes a shock-absorbing and buffering structure arranged inside the cylinder barrel, specifically including a first buffer member arranged in the rod chamber and a second buffer member arranged in the rodless chamber. By arranging the shock-absorbing and buffering structure inside the cylinder barrel, including the first buffer member in the rod chamber and the second buffer member in the rodless chamber, it can effectively absorb the impact force generated by the mast movement, reduce the vibration during the operation of the forklift, and thus improve the overall stability of the forklift.

[0007] It further includes an intelligent control module. The intelligent control module includes a connecting element and a control system connected thereto. One end of the connecting element is respectively connected to the first oil inlet and the second oil inlet through independent oil pipes, and the other end is respectively connected to the two oil inlets of the forklift forward movement oil cylinder through independent oil pipes. The connecting element is a two-position four-way solenoid valve. Through the solenoid valve and the control system, the rod chamber and the rodless chamber of the shock-absorbing and buffering oil cylinder are correspondingly connected to the rod chamber and the rodless chamber of the forklift forward movement oil cylinder. When the forklift performs forward or backward operations, the solenoid valve opens or closes according to the instructions of the control system to adjust the oil flow direction to balance the pressure inside the forklift forward movement oil cylinder, thereby reducing impact and vibration and improving the stability and operation accuracy of the forklift.

[0008] Both the first buffer member and the second buffer member are cylindrical compression springs with a right-handed helix angle. The springs are in a compressed state, with both ends closed and ground flat. The first buffer member is sleeved on the piston rod. The spring force of the first buffer member is greater than that of the second buffer member. The design of the cylindrical compression spring can effectively absorb the impact force and vibration generated during the operation of the oil cylinder and provide a good buffering effect. The first buffer member has a larger spring force, resulting in a pressure difference between the two chambers of the shock-absorbing and buffering oil cylinder. The pressure difference can eliminate the pressure fluctuation in the forward movement oil cylinder and enable the forward movement oil cylinder to operate smoothly.

[0009] On one side of the sealing end cover close to the first buffer member, there is an annular flange located between the piston rod and the first buffer member, and its outer diameter is smaller than the inner diameter of the first buffer member; the outer diameter of the annular flange is 30 - 35 mm, and the height is 3 - 7 mm. Such a design can prevent the inner diameter of the spring from directly contacting the piston rod, thereby avoiding scratching the piston rod and improving the durability and reliability of the oil cylinder. The existence of the annular flange also reduces the possibility of the outer diameter of the spring contacting the inner wall of the cylinder barrel, which helps to reduce the performance degradation of the oil cylinder caused by friction and wear.

[0010] On one side of the piston close to the rodless chamber, there is a circular boss located inside the second buffer member, and the diameter of the circular boss is smaller than the inner diameter of the second buffer member; the diameter of the circular boss is 30 - 35 mm, and the height is 3 - 7 mm. By means of the circular boss on the piston, the possibility of the outer diameter of the spring contacting the inner wall of the cylinder barrel is reduced, and the service life of the spring and the cylinder barrel is prolonged.

[0011] The first oil inlet is arranged in front of the piston when the first buffer member is compressed to the minimum stroke range; the second oil inlet is arranged behind the piston when the second buffer member is compressed to the minimum stroke range. By arranging the oil inlets at appropriate positions on both sides of the piston, it can ensure that the oil cylinder receives appropriate oil flow at all stages of the stroke, thereby achieving precise control of the piston movement speed.

[0012] On the outer circumference of the piston, a first ring groove and a second ring groove are arranged in sequence according to the axial position. A first seal is arranged on the outer circle of the first ring groove, and a second seal is arranged on the outer circle of the second ring groove. The surfaces of the first seal and the second seal are both movably connected to the inner wall of the cylinder barrel. The arrangement of the first ring groove and the second ring groove enables the first seal and the second seal to form a dynamic sealing connection with the inner wall of the cylinder barrel.

[0013] On the outer circle of the sealing end cover, a third seal is arranged, and the surface of the third seal is movably connected to the inner wall of the cylinder barrel; on the inner circle of the sealing end cover, a fourth seal and a fifth seal are arranged, and the surfaces of the fourth seal and the fifth seal are both movably connected to the surface of the piston rod. By arranging multiple seals on the outer circle and the inner circle of the sealing end cover, it can effectively prevent oil leakage and ensure the sealing performance of the oil cylinder.

[0014] On the inner wall of the open end of the cylinder barrel, a groove is opened, and a limit retaining ring for restricting the lateral movement of the sealing end cover is installed in the groove; at the position corresponding to the groove on the sealing end cover, there is a stepped portion, and the stepped portion abuts against the limit retaining ring. The axial elastic force provided by the first buffer member ensures that the sealing end cover closely adheres to the cylinder barrel, preventing its axial displacement, thereby enhancing the stability of the oil cylinder.

[0015] The present utility model also provides a reach forklift, which includes a forklift body and a reach cylinder installed on the forklift body. The two oil inlets of the reach cylinder are respectively connected to the first oil inlet and the second oil inlet of the shock-absorbing buffer cylinder described above through a connecting element. The shock-absorbing buffer cylinder can effectively absorb the impact and vibration during the operation of the forklift, ensuring the stability of the forklift mast during the forward movement process, and reducing the sway caused by the internal pressure fluctuation or external impact of the reach cylinder.

[0016] The present utility model has at least the following beneficial effects:

[0017] 1) Through the shock-absorbing buffer structure designed inside the cylinder barrel, including the first buffer member in the rod chamber and the second buffer member in the rodless chamber, the present utility model can effectively absorb the impact force generated by the mast movement and reduce the vibration during the operation of the forklift. This design significantly improves the stability of the forklift during cargo handling, especially on uneven ground or during rapid movement, reducing the sway caused by the internal pressure fluctuation of the cylinder or external impact, thereby reducing the risk of cargo damage and the safety risk of the operator.

[0018] 2) Through the application of the solenoid valve and the intelligent control system, the rod chamber and the rodless chamber of the shock-absorbing buffer cylinder can be precisely connected to the corresponding chambers of the forklift reach cylinder. The main function of this design is that when the forklift moves forward or backward, the control system will intelligently adjust the on-off state of the solenoid valve according to the real-time monitored data, thereby controlling the flow direction of the oil. Such adjustment helps to balance the pressure inside the reach cylinder, reduce the impact and vibration caused by the cylinder movement, and ensure the stability and operation accuracy of the forklift during the handling operation.

[0019] 3) The design of the cylindrical compression spring in the shock-absorbing buffer cylinder, as well as the structures of the boss and the annular flange on the piston and the sealing end cover, not only provide good buffering effects, but also reduce the direct contact between the piston rod and the spring and the inner wall of the cylinder barrel, thereby reducing wear. These design details extend the service life of the cylinder and its components, reducing the maintenance requirements and costs. At the same time, the introduction of the intelligent regulation module further improves the reliability of the cylinder and the convenience of maintenance by real-time monitoring and adjusting the oil pressure, ensuring the long-term stable operation of the forklift. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 This is a cross-sectional view of the shock-absorbing and buffering oil cylinder in the embodiment of the present utility model.

[0022] Reference numerals in the drawings: 1 - cylinder barrel; 2 - piston; 201 - circular boss; 202 - first seal; 203 - second seal; 3 - piston rod; 4 - sealed end cover; 401 - annular flange; 402 - third seal; 403 - fourth seal; 404 - fifth seal; 5 - first oil inlet; 6 - second oil inlet; 7 - first buffer; 8 - second buffer; 9 - limit retaining ring. Specific embodiments

[0023] Next, the technical solutions in the specific embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0024] The implementation of the present utility model will be described in detail below in conjunction with specific embodiments.

[0025] In the embodiment of the present utility model, with reference to Figure 1 As shown, a shock-absorbing and buffering oil cylinder is provided. The oil cylinder mainly includes: a cylinder barrel 1, a piston 2, a piston rod 3, and a sealed end cover 4. The cylinder barrel 1 constitutes the main structure of the oil cylinder and forms a space for accommodating the piston 2 and the piston rod 3 inside. The piston 2 is installed inside the cylinder barrel 1 and is used to divide the internal space of the cylinder barrel 1 into two chambers. One end of the piston rod 3 is connected to the piston 2, and the other end extends outside the cylinder barrel 1 through the sealed end cover 4 and is used to transfer the movement of the piston 2 to an external load. The side where the piston rod 3 is located is the rod chamber, and the other side is the non-rod chamber. The two are separated by the piston 2 to achieve the reciprocating movement of the oil cylinder. The sealed end cover 4 is installed at the open end of the cylinder barrel 1 and is used to seal the cylinder barrel 1 and provide sealing to ensure the stability of the oil pressure inside the oil cylinder. The cylinder barrel 1 is provided with a first oil inlet 5 and a second oil inlet 6, which are connected to an oil source through independent oil pipes and are used to supply oil to the two chambers inside the cylinder barrel 1.

[0026] It also includes a shock absorption and buffering structure arranged inside the cylinder barrel 1. The purpose of this structure is to absorb and mitigate the impact and vibration generated when the forklift performs forward or backward operations, thereby improving the smoothness and service life of forklift operation. The shock absorption and buffering structure specifically includes: a first buffer member 7 arranged in the rod chamber and a second buffer member 8 arranged in the rodless chamber, which are used to provide buffering when the piston 2 moves to the forefront or the rearmost end. Both the first buffer member 7 and the second buffer member 8 adopt the design of a cylindrical compression spring with a right-handed helix angle. After the spring is installed in the cylinder barrel 1, it is in a compressed state, and both ends are tightened and ground to ensure the stability and durability of the spring. The first buffer member 7 is sleeved on the piston rod 3, and the spring force of the first buffer member 7 is greater than that of the second buffer member 8. This design causes a pressure difference between the two chambers of the shock absorption and buffering oil cylinder, and the pressure difference can eliminate the pressure fluctuation in the forward movement oil cylinder, enabling the forward movement oil cylinder to operate smoothly.

[0027] It also includes an intelligent control module. This module includes a two-position four-way solenoid valve and a control system connected thereto. The corresponding connection between the shock absorption and buffering oil cylinder and the forklift forward movement oil cylinder is realized through the solenoid valve. The solenoid valve can accurately control the oil flow direction according to the instructions of the control system. One end of the solenoid valve is connected to the first oil inlet 5 and the second oil inlet 6 respectively through independent oil pipes, and the other end is connected to the two oil inlets of the forklift forward movement oil cylinder respectively through independent oil pipes. This design uses the pressure difference on both sides to eliminate the pressure fluctuation inside the forklift forward movement oil cylinder. During the forward or backward operation of the forklift, the intelligent control system real-time monitors the movement state of the oil cylinder and issues control instructions accordingly. These instructions are used to manipulate the solenoid valve to adjust the connectivity between the shock absorption and buffering oil cylinder and the forklift forward movement oil cylinder. Since the shock absorption and buffering oil cylinder is designed with two chambers and a certain pressure difference is maintained between the two chambers, they can effectively balance the pressure fluctuation inside the forklift forward movement oil cylinder.

[0028] The first oil inlet 5 is arranged in front of the piston 2 when the first buffer member 7 is compressed to its minimum stroke range; the second oil inlet 6 is arranged behind the piston 2 when the second buffer member 8 is compressed to the minimum stroke range, enabling the oil cylinder to receive pressure oil from the oil source in a timely manner. On one side of the sealing end cover 4 close to the first buffer member 7, there is designed an annular flange 401. This annular flange 401 is located between the piston rod 3 and the first buffer member 7. Its design purpose is to provide a stable support point for the piston rod 3 during the operation of the oil cylinder, and at the same time avoid direct contact between the piston rod 3 and the first buffer member 7, reducing wear and maintaining the sealing performance of the oil cylinder. The outer diameter of the annular flange 401 is designed to be 30 - 35 mm, and the height is 3 - 7 mm. This size range ensures that the annular flange 401 can effectively adapt to different working conditions while maintaining sufficient structural strength. On one side of the piston 2 close to the rodless chamber, there is provided a circular boss 201, and this boss is located inside the second buffer member 8. The design of the circular boss 201 helps to interact with the second buffer member 8 when the backward stroke of the piston 2 ends, providing the necessary buffering effect and reducing impact and vibration. The diameter of the circular boss 201 is also designed to be 30 - 35 mm, and the height is 3 - 7 mm. Such a size design ensures that the boss can work stably inside the second buffer member 8 without interfering with other components inside the oil cylinder.

[0029] On the outer circumference of the piston 2, a first ring groove and a second ring groove are sequentially arranged in the circumferential direction, and these two ring grooves are distributed along the axial direction of the piston 2. A first seal 202 is installed on the outer circle of the first ring groove, while a second seal 203 is installed on the outer circle of the second ring groove. The design of these seals is to be able to dynamically contact the inner wall of the cylinder barrel 1 when the piston 2 reciprocates in the cylinder barrel 1, thereby providing effective sealing. A third seal 402 is arranged on the outer circle of the sealing end cover 4, and its surface is dynamically connected to the inner wall of the cylinder barrel 1 to ensure the sealing of the open end of the cylinder barrel 1. In addition, a fourth seal 403 and a fifth seal 404 are also arranged on the inner circle of the sealing end cover 4, and they are dynamically connected to the surface of the piston rod 3, further enhancing the sealing performance of the oil cylinder. In order to ensure the stability of the sealing end cover 4 in the oil cylinder and prevent its lateral movement, a groove is opened on the inner wall of the open end of the cylinder barrel 1, and a limit retaining ring 9 for restricting the lateral movement of the sealing end cover 4 is installed in the groove. At the position of the sealing end cover 4 corresponding to the groove, there is provided a stepped portion, and the stepped portion and the limit retaining ring 9 resist each other, forming a mechanical locking structure to ensure the fixed position of the sealing end cover 4 in the oil cylinder. The design of these sealing structures not only improves the sealing performance of the shock-absorbing buffer oil cylinder, but also enhances its reliability and durability under various working conditions.

[0030] In this embodiment, the specific dimensions and design parameters of the shock-absorbing buffer oil cylinder are as follows: Piston 2: outer diameter 50 mm, effective thickness 21 mm; circular boss 201 on the right end face, diameter 33 mm, height 5 mm. Piston rod 3: diameter 30 mm, effective lengths of piston 2 and piston rod 3 are 245 mm. Cylinder barrel 1: total length 330 mm. Sealing end cover 4: slightly protruding about 2 mm from the left end face of cylinder barrel 1; annular flange 401 provided on the right side: diameter 33 mm, height about 5 mm. First buffer member 7: both end faces are ground flat and tightened by 3 / 4 turns each, number of supporting turns is 1.5d, spring pitch ratio = 40 / 7, wire diameter of the spring 7 mm, mean diameter 40 mm, number of effective turns of the spring 10 turns, pitch t = 15.3 mm, length in natural state is about 160 mm. Second buffer member 8: both end faces are ground flat and tightened by 3 / 4 turns each, number of supporting turns is 1.5d, spring pitch ratio = 40 / 7, wire diameter of the spring 7 mm, mean diameter 40 mm, number of effective turns of the spring 9.75 turns, pitch t ≈ 15.7 mm, length in natural state is about 160 mm.

[0031] The present utility model also provides a reach forklift, which mainly includes a forklift body and a reach cylinder installed on the forklift body. The two oil inlets of the reach cylinder are respectively connected to the first oil inlet 5 and the second oil inlet 6 of the above-mentioned shock-absorbing buffer oil cylinder. The design of connecting the shock-absorbing buffer oil cylinder to the reach cylinder ensures the stability of the forklift mast during the forward movement process, and reduces the sway caused by the internal pressure fluctuation or external impact of the cylinder.

[0032] Through its innovative design, the shock-absorbing buffer oil cylinder of the present utility model shows remarkable beneficial effects in improving the operation smoothness and service life of the forklift. The key components of the oil cylinder include the carefully designed cylinder barrel 1, piston 2, piston rod 3 and sealing end cover 4, as well as the built-in shock-absorbing buffer structure, which is composed of two cylindrical compression springs with right-handed helix angles and is respectively installed in the rod chamber and the rodless chamber to absorb the impact and vibration during the forward or backward operation of the forklift. In addition, the introduction of the intelligent control module enables the rod chamber and the rodless chamber of the shock-absorbing buffer oil cylinder to be correspondingly connected to the corresponding chambers of the forklift reach cylinder through electromagnetic valves, and automatically adjusts the connectivity between the shock-absorbing buffer oil cylinder and the forklift reach cylinder, which can effectively balance the internal pressure fluctuation of the forklift reach cylinder. The optimization of the oil inlet design and the sealing structure of the oil cylinder further enhances the sealing performance and structural stability of the oil cylinder. The comprehensive application of these design features makes the reach forklift not only operate more smoothly and safely during the cargo handling operation, but also have lower maintenance costs and significantly improved overall performance.

[0033] It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the scope of protection of the claims of the present utility model.

Claims

1. A shock-absorbing buffer oil cylinder, characterized in that, It includes a cylinder barrel (1), a piston (2), a piston rod (3) and a sealing end cover (4). A first oil inlet (5) and a second oil inlet (6) are provided on the cylinder barrel (1). The sealing end cover (4) is installed at the open end of the cylinder barrel (1). The piston (2) is installed inside the cylinder barrel (1). One end of the piston rod (3) is connected to the piston (2), and the other end passes through the sealing end cover (4) and extends outside the cylinder barrel (1). The piston (2) divides the internal space of the cylinder barrel (1) into two chambers. The side where the piston rod (3) is located is the rod chamber, and the other side is the rodless chamber. It further includes a shock absorption and buffering structure arranged inside the cylinder barrel (1), specifically including a first buffer member (7) arranged in the rod chamber and a second buffer member (8) arranged in the rodless chamber).

2. The oil cylinder according to claim 1, characterized in that, It further includes an intelligent control module. The intelligent control module includes a connecting element and a control system connected thereto. One end of the connecting element is respectively connected to the first oil inlet (5) and the second oil inlet (6) through independent oil pipes, and the other end is respectively connected to the two oil inlets of the forklift forward movement oil cylinder through independent oil pipes. The connecting element is a two-position four-way solenoid valve.

3. The oil cylinder according to claim 1, characterized in that, Both the first buffer member (7) and the second buffer member (8) are cylindrical compression springs with a right-handed helix angle. The springs are in a compressed state, with both ends closed and ground flat. The first buffer member (7) is sleeved on the piston rod (3). The spring force of the first buffer member (7) is greater than the spring force of the second buffer member (8).

4. The oil cylinder according to claim 3, characterized in that, A circular flange (401) is provided on the side of the sealing end cover (4) close to the first buffer member (7), located between the piston rod (3) and the first buffer member (7). Its outer diameter is smaller than the inner diameter of the first buffer member (7). The outer diameter of the circular flange (401) is 30 - 35 mm, and the height is 3 - 7 mm.

5. The oil cylinder according to claim 3, characterized in that, A circular boss (201) located inside the second buffer member (8) is provided on the side of the piston (2) close to the rodless chamber. The diameter of the circular boss (201) is smaller than the inner diameter of the second buffer member (8). The diameter of the circular boss (201) is 30 - 35 mm, and the height is 3 - 7 mm.

6. The oil cylinder according to claim 3, characterized in that, The first oil inlet (5) is arranged in front of the piston (2) when the first buffer member (7) is compressed to the minimum stroke range. The second oil inlet (6) is arranged behind the piston (2) when the second buffer member (8) is compressed to the minimum stroke range.

7. The oil cylinder according to claim 1, wherein A first ring groove and a second ring groove are circumferentially arranged on the outer circumference of the piston (2). The first ring groove and the second ring groove are arranged in sequence along the axial position. A first seal (202) is arranged on the outer circle of the first ring groove, and a second seal (203) is arranged on the outer circle of the second ring groove. The surfaces of the first seal (202) and the second seal (203) are both movably connected to the inner wall of the cylinder barrel (1).

8. The oil cylinder according to claim 1, wherein, A third seal (402) is provided on the outer ring of the sealed end cover (4), and the surface of the third seal (402) is movably connected to the inner wall of the cylinder barrel (1); a fourth seal (403) and a fifth seal (404) are provided on the inner ring of the sealed end cover (4), and the surfaces of the fourth seal (403) and the fifth seal (404) are both movably connected to the surface of the piston rod (3).

9. The oil cylinder according to claim 1, characterized in that, A groove is formed in the inner wall of the open end of the cylinder barrel (1), and a limit retaining ring (9) for restricting the lateral movement of the sealed end cover (4) is installed in the groove; a stepped portion is provided at the position of the sealed end cover (4) corresponding to the groove, and the stepped portion abuts against the limit retaining ring (9).

10. A reach forklift, characterized in that, It includes a forklift body and a front shift oil cylinder installed on the forklift body, and two oil inlets of the front shift oil cylinder are respectively connected to the first oil inlet (5) and the second oil inlet (6) of the shock absorption and buffer oil cylinder according to any one of claims 1-9 through a connecting element.

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