A flexible connection structure for a suspension system in a semi-trailer

Abstract

The invention discloses a flexible connection structure for a suspension system in a semitrailer, and relates to the technical field of a suspension system for a semitrailer. The invention aims at a suspension system in a semitrailer, and combines the working advantages of a leaf spring and an air spring, and is different in that: a free swinging motion of a directional swing ball generated during the movement of the semitrailer is utilized, and is specifically manifested as: a second hydraulic telescopic rod and a first hydraulic telescopic rod are added, and neither of them actively bears a buffering action in the suspension system, but acts on an "inertial movement" process generated by the influence of inertia. The essence of the invention is: a displacement sensor is used to detect the difference in the degree of deformation of the two end positions of the leaf spring caused by the influence of inertia, and an auxiliary air spring is used in combination to perform "inertia difference compensation", and the hydraulic pressure difference between the second hydraulic telescopic rod and the first hydraulic telescopic rod is used, and the directional swing ball "actively bears" the above-mentioned inertia difference, thereby reducing the workload in the suspension system.

Description

Technical Field

[0001] The present invention relates to the technical field of semitrailer suspension systems, and in particular to a flexible connection structure for a suspension system in a semitrailer. Background Art

[0002] The vehicle suspension system is one of the important structures for vehicle driving safety, which specifically includes traditional leaf spring suspension and air suspension. The semi-trailer is different from the full trailer. The semi-trailer is a trailer with the axle placed behind the center of gravity of the vehicle (when the vehicle is evenly loaded) and equipped with a coupling device that can transmit horizontal or vertical force to the tractor. It has no power itself and is driven entirely by the main vehicle. Its load can reach tens of tons.

[0003] The essence of the suspension system is to move up and down in a direction perpendicular to the gravity, thereby utilizing the spring structure to "absorb" and "release" energy. Combined with the inertial force, it is explained again that as the load increases, the inertial force has a greater impact. It can be understood that the up and down movement in the suspension system "increases" the "movement process" in the direction of vehicle travel. Specifically, it increases the movement burden of the transmission structure (force rod), spring structure and other structures in the suspension system, resulting in reduced performance of the suspension system and even buffer failure due to direct damage, such as reduced elasticity in traditional leaf springs and direct damage and failure of air springs. This application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible connection structure for a suspension system in a semi-trailer. For the suspension system in a high-load semi-trailer, due to the influence of inertial force affected by the load, the conventional suspension system will "exist" an additional horizontal movement process during the vertical movement process, which increases the movement burden in the suspension system and causes the buffering performance of the suspension system to decrease or even fail.

[0005] The object of the present invention can be achieved by the following technical scheme: A flexible connection structure for a suspension system in a semi-trailer, comprising a main shaft and a steel frame assembly, wherein a leaf spring is arranged at a position below the main shaft of the steel frame assembly, and a transverse mounting sleeve arranged along its length direction is installed at a position at the middle section of the lower side of the steel frame assembly, and a main air spring arranged vertically is installed at a position at the middle section of the upper end of the leaf spring corresponding to the transverse mounting sleeve;

[0006] The steel skeleton assembly is slidably mounted with straight slides on both sides of the corresponding transverse mounting sleeves, a second hydraulic telescopic rod is arranged at the lower side of the straight slide, a rolling sleeve is installed at one end of the second hydraulic telescopic rod, and a roller corresponding to the upper surface of the leaf spring is rotatably mounted inside the rolling sleeve;

[0007] The steel frame assemblies are symmetrically arranged along the length direction of the main axis, and a directional swing ball is arranged at the center point area between the two steel frame assemblies, and the directional swing ball is arranged with a first hydraulic telescopic rod corresponding to the steel frame assembly.

[0008] It is further configured as follows: a support seat corresponding to the steel skeleton assembly and the directional swing ball is installed on the main shaft, the middle section of the lower surface of the steel skeleton assembly is installed on the support seat, and a two-stage auxiliary air spring arranged vertically is arranged on the support seat corresponding to the directional swing ball.

[0009] It is further configured as follows: a hemispherical sleeve is installed at positions of the steel skeleton assembly and the directional swing ball corresponding to the two ends of the first hydraulic telescopic rod, a ball head is provided at both ends of the first hydraulic telescopic rod and the secondary auxiliary air spring, and the ball heads at both ends of the first hydraulic telescopic rod are movably connected to the hemispheric sleeve, and the ball heads at both ends of the secondary auxiliary air spring are movably connected to the directional swing ball and the support seat.

[0010] It is further configured as follows: a first-stage auxiliary air spring corresponding to the length direction of the steel skeleton assembly is installed in the transverse mounting sleeve, and the two ends of the first-stage auxiliary air spring are respectively fixedly connected to one end of the straight-moving slide, and the other end of the second hydraulic telescopic rod is rotatably connected to the straight-moving slide.

[0011] It is further configured as follows: displacement sensors are installed at the two end positions of the steel skeleton assembly corresponding to its length direction, and the end of the transmission shaft of the displacement sensor is fixedly connected to the execution slide.

[0012] It is further configured as follows: an oil tank is provided in each of the first hydraulic telescopic rod and the second hydraulic telescopic rod, and the oil tank inside the first hydraulic telescopic rod is communicated with the oil tank inside the second hydraulic telescopic rod at a corresponding position.

[0013] The present invention has the following beneficial effects:

[0014] 1. The overall structure is based on the suspension system of conventional semi-trailers, combining the structural advantages of leaf springs and air springs, and further adding a second hydraulic telescopic rod and a first hydraulic telescopic rod to cooperate with the above two. The two will not "take responsibility" for the suspension protection function in the suspension system, but "actively bear" the "inertia difference" caused by the influence of inertia, which is manifested as: due to the influence of inertia force, the deformation degree of the two ends of the leaf spring is different, and the sliding distance of the matching roller relative to the leaf spring is different, so the displacement sensor is used for perception, and finally the auxiliary air spring is used for "inertia difference compensation";

[0015] 2. A directional swing ball is further provided in the overall structure. There is no fixed connection between the directional swing ball and the overall structure, but it swings freely as the semi-trailer moves. Under the free swinging motion, the first hydraulic telescopic rods at the four sides thereof are directional deflected and directional telescopic, and the directional telescopic process of the second hydraulic telescopic rod is further utilized. The hydraulic pressure difference in the internal oil tanks of the two is utilized, specifically, the hydraulic pressure in the second hydraulic telescopic rod directly acts on the oil tank inside the first hydraulic telescopic rod. The key purpose is to "actively bear" the above-mentioned inertia difference with the free swing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a flexible connection structure for a suspension system in a semi-trailer proposed by the present invention;

[0018] Figure 2 A flexible connection structure for a suspension system in a semi-trailer proposed by the present invention Figure 1 Side view of

[0019] Figure 3 A flexible connection structure for a suspension system in a semi-trailer proposed by the present invention Figure 1 A top view of

[0020] Figure 4 A front view of a steel skeleton assembly in a flexible connection structure for a suspension system in a semi-trailer proposed by the present invention;

[0021] Figure 5 A flexible connection structure for a suspension system in a semi-trailer proposed by the present invention Figure 4 A partial cutaway view of

[0022] Figure 6 The present invention is a schematic structural diagram of a directional swing ball in a flexible connection structure for a suspension system in a semi-trailer.

[0023] In the figure: 1. Main shaft; 2. Steel skeleton assembly; 3. Directional swing ball; 4. Leaf spring; 5. First hydraulic telescopic rod; 6. Support seat; 7. Hemispherical sliding sleeve; 8. Horizontal mounting sleeve; 9. Straight sliding seat; 10. Second hydraulic telescopic rod; 11. Roller sleeve; 12. First-stage auxiliary air spring; 13. Roller; 14. Main air spring; 15. Second-stage auxiliary air spring; 16. Displacement sensor. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1: For the suspension system of large-tonnage vehicles such as semi-trailers, the inertia generated by the load increases, and the up and down movement in the suspension system "increases" the "movement process" in the direction of vehicle travel, which is specifically manifested in the increase of the movement burden of the transmission structure (force rod), spring structure and other structures in the suspension system, resulting in a decrease in the performance of the suspension system and even buffer failure due to direct damage. The following technical solutions are proposed:

[0026] Reference Figures 1 to 6 In this embodiment, a flexible connection structure for a suspension system in a semitrailer includes a main shaft 1 and a steel frame assembly 2. A leaf spring 4 is arranged at a lower position of the steel frame assembly 2 corresponding to the main shaft 1, and a transverse mounting sleeve 8 arranged along its length direction is installed at a lower middle position of the steel frame assembly 2. A main air spring 14 arranged vertically is installed at an upper middle position of the leaf spring 4 corresponding to the transverse mounting sleeve 8.

[0027] The steel skeleton assembly 2 is slidably mounted with straight slides 9 on both sides corresponding to the lateral mounting sleeves 8, a second hydraulic telescopic rod 10 is arranged at the lower side of the straight slide 9, a rolling sleeve 11 is installed at one end of the second hydraulic telescopic rod 10, and a roller 13 corresponding to the upper surface of the leaf spring 4 is rotatably mounted inside the rolling sleeve 11;

[0028] The steel frame assembly 2 is symmetrically arranged along the length direction of the main axis 1, and a directional swing ball 3 is arranged at the center point area between the two steel frame assemblies 2, and the directional swing ball 3 is provided with a first hydraulic telescopic rod 5 corresponding to the steel frame assembly 2;

[0029] The main shaft 1 is provided with a support seat 6 corresponding to the steel frame assembly 2 and the directional swing ball 3. The middle section of the lower surface of the steel frame assembly 2 is provided on the support seat 6. The support seat 6 corresponding to the directional swing ball 3 is provided with a secondary auxiliary air spring 15 arranged vertically.

[0030] Hemispherical sleeves 7 are installed at positions of the steel skeleton assembly 2 and the directional swing ball 3 corresponding to the two ends of the first hydraulic telescopic rod 5. Ball heads are provided at both ends of the first hydraulic telescopic rod 5 and the secondary auxiliary air spring 15. The ball heads at both ends of the first hydraulic telescopic rod 5 are movably connected to the hemispherical sleeves 7, and the ball heads at both ends of the secondary auxiliary air spring 15 are movably connected to the directional swing ball 3 and the support seat 6.

[0031] Working principle: The overall structure is mainly aimed at the main shaft 1 position in the semi-trailer. Its essence belongs to the suspension assembly structure in the semi-trailer. Figure 4 Description: The steel skeleton assembly 2 is used as a structure for connecting the semi-trailer body, wherein a leaf spring 4 and a vertically arranged main air spring 14 are added. Figure 4 It can be understood that when the semi-trailer bumps, the two sides of the leaf spring 4 are subjected to the downward force generated by the steel frame assembly 2, causing the two sides of the leaf spring 4 to deform downward, but the middle section of the leaf spring 4 is "fixed" on the main shaft 1, so that the main air spring 14 can also be used for buffering protection. This part is the basic principle of the suspension system;

[0032] The present invention mainly combines the advantages of the leaf spring 4 and the main air spring 14, but the key is to add a second hydraulic telescopic rod 10. Because of the inertia, the semi-trailer produces forward "inertial movement" and Figure 4 For example, the semi-trailer moves from left to right. In theory, the deformation degree of the positions on both sides of the leaf spring 4 is consistent, so it can be understood that: the leaf spring 4 evenly bears the pressure from the steel frame assembly 2, but due to the influence of inertia, the deformation degree of the right side of the leaf spring 4 is slightly greater than the deformation degree of the right side, so that during long-term use, the elasticity of the two ends of the leaf spring 4 deviates, but the second hydraulic telescopic rods 10 on both sides of the main air spring 14 are used. The two second hydraulic telescopic rods 10 are arranged in an eight-shaped shape, and the auxiliary air spring 12 is used to ensure that the inclination angles of the two second hydraulic telescopic rods 10 are exactly the same. Specifically, the auxiliary air spring 14 is used to ensure that the two straight slides 9 move towards each other by the same distance, so that the roller 13 completely contacts the upper curved surface of the leaf spring 4 and slides freely along the upper curved surface of the leaf spring 4;

[0033] Therefore, when the distance between the leaf spring 4 and the steel frame assembly 2 is reduced due to the bumping process, the leaf spring 4 bends downward first, and the second hydraulic telescopic rod 10 therein is "squeezed". The hydraulic oil is mainly used inside the second hydraulic telescopic rod 10 to realize the telescopic process. Therefore, when the amount of hydraulic oil is constant, the two straight-moving slides 9 are directly "forced" to move in the direction close to the first-stage auxiliary air spring 12. However, due to the deformation difference of the leaf spring 4, the displacement distance of the two straight-moving slides 9 deviates.

[0034] Embodiment 2: This embodiment proposes the following supplementary solution based on Embodiment 1:

[0035] A first-stage auxiliary air spring 12 corresponding to the length direction of the steel skeleton assembly 2 is installed in the transverse mounting sleeve 8, and the two end positions of the first-stage auxiliary air spring 12 are fixedly connected to one end position of the straight-moving slide 9 respectively, and the other end position of the second hydraulic telescopic rod 10 is rotatably connected to the straight-moving slide 9. Displacement sensors 16 are installed at the two end positions corresponding to the length direction of the steel skeleton assembly 2, and the end of the transmission shaft of the displacement sensor 16 is fixedly connected to the execution slide 9. Oil tanks are provided in the first hydraulic telescopic rod 5 and the second hydraulic telescopic rod 10, and the internal oil tank of the first hydraulic telescopic rod 5 is connected to the internal oil tank of the second hydraulic telescopic rod 10 at the corresponding position.

[0036] Solution description: Combined with the first embodiment, when the leaf spring 4 is deformed, the moving distance of the two straight slides 9 needs to be further limited by the primary auxiliary air spring 12. First, it is necessary to ensure that the roller 13 slides freely with the bending deformation of the leaf spring 4 and continuously contacts the upper curved surface of the leaf spring 4. In order to "bear" the inertia difference, it is necessary to ensure that the second hydraulic telescopic rod 10 at the right position has a greater degree of expansion and contraction than the second hydraulic telescopic rod 10 at the left position. In the process of resetting the leaf spring 4, first, the elastic effect of the leaf spring 4 itself is utilized, and secondly, the two processes of charging / deflating the main air spring 14 are utilized, so as to ensure that the steel skeleton assembly 2 (vehicle body) is reset in a relatively stable state.

[0037] It can be seen that the key principles of the leaf spring 4 and the air spring are still used in the overall structure, but a directional swing ball 3 is added to the overall structure again. The directional swing ball 3 is not fixedly connected to the steel frame assembly 2, so that the directional swing ball 3 does not serve as a related structure to bear the bumps, but will swing freely during the movement of the vehicle body. Figure 1 and Figure 6To illustrate, the directional swing ball 3 is "pulled" by four first hydraulic telescopic rods 5, and the front and rear sections of the first hydraulic telescopic rods 5 are both set as ball head structures. This purpose ensures that the first hydraulic telescopic rods 5, the steel frame assembly 2 and the directional swing ball 3 can move freely, so that the directional swing ball 3 can move forward and backward, left and right, or up and down with the action of inertia during the movement of the vehicle body. If the first hydraulic telescopic rod 5 and the secondary auxiliary air spring 15 are used as a connecting soft rope, the free swinging motion of the directional swing ball 3 will not be affected by any structure in the present invention. However, in this embodiment, the secondary auxiliary air spring 5 is specifically used to bear the force of the directional swing ball 3 when it moves up and down, and the first hydraulic telescopic rods 5 at four positions are used to bear the force of the directional swing ball 3 when it moves left and right / forward and backward. The key is that the directional swing ball 3 can indirectly "bear" the "inertia difference" introduced in the first embodiment during the free swinging motion.

[0038] Embodiment 3: The first hydraulic telescopic rod and the second hydraulic telescopic rod in Embodiment 1 and Embodiment 2 are further supplemented, and specifically include the following scheme description:

[0039] S1: Combination Figure 3 and Figure 4 To illustrate, the second hydraulic telescopic rods 10 at four positions are respectively set to the upper left position, the upper right position, the lower right position and the lower left position based on the directional swing ball 3. Similarly, the four first hydraulic telescopic rods 10 are set to the upper left supplementary position, the upper right supplementary position, the lower right supplementary position and the lower left supplementary position based on the directional swing ball 3. The essence is that the oil tank in the second hydraulic telescopic cylinder 10 in the upper left position is connected with the oil tank in the first hydraulic telescopic rod in the upper left supplementary position, and so on.

[0040] S2: When the semi-trailer encounters bumps during the continuous straight-line movement, the moving speed of the semi-trailer will be slightly reduced. In this state, the directional swing ball 3 is first affected by the inertia force and continues to move forward, so that the first hydraulic telescopic rods 5 in the upper left filling position and the upper right filling position are in a compressed state, and the first hydraulic telescopic rods 5 in the lower right filling position and the lower left filling position are in an extended state;

[0041] In combination with the technical content of the second embodiment, the second hydraulic telescopic rod 10 corresponding to the upper left position is adapted to the deformation difference of the leaf spring 4, and the key is reflected in the moving distance of the straight slide 9, but each second hydraulic telescopic rod 10 is in a passively compressed state, and the difference is that the compression amount of the second hydraulic telescopic cylinder 10 corresponding to the upper left position and the lower right position is different;

[0042] S3: Combined with S1 and S2, we can summarize: the overall suspension system still uses the leaf spring 4 and the main air spring 14 for buffering protection, but as shown in S2, a primary auxiliary air spring 12 is needed to further limit the moving distance of the two straight slides 9. Its essence is: first, the moving distance of the straight slide 9 is sensed by the displacement sensor 16, and in order to ensure that the roller 13 continuously contacts the upper curved surface of the leaf spring 4, the primary auxiliary air spring 12 needs to be inflated to prompt the two straight slides 9 to move in opposite directions. However, the difference in the deformation amount of the leaf spring 4 directly leads to the difference in the compression amount in the second hydraulic telescopic rod 10, which is directly reflected in the difference in the amount of hydraulic oil in its internal oil tank. The key is: because of the compression action, the hydraulic oil in the second hydraulic telescopic rod 10 is squeezed into the oil tank in the first hydraulic telescopic rod 5, and then the compression amount is changed due to the difference in the amount of hydraulic oil in the internal oil tank of the second hydraulic telescopic cylinder 10, thereby further limiting the free swinging motion of the directional swing ball 3;

[0043] S4: Combined with S3 again, when the semi-trailer encounters bumps during the turning process, the directional swing ball 3 will also move left and right during the forward deflection movement. Specifically, the difference in the amount of hydraulic oil in the oil tank of the first hydraulic telescopic rod 5 is still changed. It can be understood that the main air spring 14 and the leaf spring 4 directly assume the buffering and protection function of the steel skeleton assembly 2, and the buffering and protection function of the main air spring 14 is more direct and effective than that of the leaf spring 4. However, because the leaf spring 4 is affected by the inertial force and produces a deformation difference, the deflection movement in the overall structure is set to "inertial movement", and the auxiliary air spring 12 is used to perform "inertia difference compensation" for the "inertial movement". However, it is specifically the directional swing ball 3 that actively assumes the "inertia difference compensation" because the directional swing ball 3 is in an "independent structure", thereby avoiding the increase in the workload of the main air spring 14 and the leaf spring 4 due to the "inertia difference".

[0044] To sum up: the suspension system in the semi-trailer combines the working advantages of the leaf spring and the air spring. The difference is that the free swing motion of the directional swing ball as the semi-trailer moves is utilized. Specifically, a second hydraulic telescopic rod and a first hydraulic telescopic rod are added. Neither of them will actively assume the buffering action in the suspension system, but will act on the "inertial movement" process caused by the influence of inertia. Its essence is: a displacement sensor is used to detect the difference in the degree of deformation of the two ends of the leaf spring caused by the influence of inertia, and the auxiliary air spring is used to perform "inertia difference compensation", and the hydraulic difference between the second hydraulic telescopic rod and the first hydraulic telescopic rod is used. The directional swing ball "actively assumes" the above-mentioned inertia difference, thereby reducing the workload in the suspension system.

[0045] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible connection structure for a suspension system in a semitrailer, comprising a main shaft (1) and a steel skeleton assembly (2), characterized in that: A leaf spring (4) is arranged at a lower position of the steel frame assembly (2) corresponding to the main shaft (1), and a transverse mounting sleeve (8) arranged along its length direction is installed at a lower middle position of the steel frame assembly (2), and a main air spring (14) arranged vertically is installed at an upper middle position of the leaf spring (4) corresponding to the transverse mounting sleeve (8); A straight-moving slide (9) is slidably mounted on both sides of the steel skeleton assembly (2) corresponding to the transverse mounting sleeve (8); a second hydraulic telescopic rod (10) is arranged at the lower side of the straight-moving slide (9); a roller sleeve (11) is mounted at one end of the second hydraulic telescopic rod (10); a roller (13) corresponding to the upper surface of the leaf spring (4) is rotatably mounted inside the roller sleeve (11); The steel frame assemblies (2) are symmetrically arranged along the length direction of the main axis (1), and a directional swing ball (3) is arranged at the center point area between the two steel frame assemblies (2), and the directional swing ball (3) is provided with a first hydraulic telescopic rod (5) corresponding to the steel frame assembly (2).

2. The flexible connection structure for a suspension system in a semitrailer according to claim 1, characterized in that: A support seat (6) corresponding to the steel frame assembly (2) and the directional swing ball (3) is installed on the main shaft (1); the middle section of the lower surface of the steel frame assembly (2) is installed on the support seat (6); and a two-stage auxiliary air spring (15) arranged vertically is arranged on the support seat (6) corresponding to the directional swing ball (3).

3. The flexible connection structure for a suspension system in a semitrailer according to claim 2, characterized in that: The steel skeleton assembly (2) and the directional swing ball (3) are provided with hemispherical sleeves (7) at positions corresponding to the two ends of the first hydraulic telescopic rod (5); the first hydraulic telescopic rod (5) and the two-stage auxiliary air spring (15) are both provided with ball heads at the two ends; the ball heads at the two ends of the first hydraulic telescopic rod (5) are movably connected to the hemispherical sleeves (7); the ball heads at the two ends of the two-stage auxiliary air spring (15) are movably connected to the directional swing ball (3) and the support seat (6).

4. The flexible connection structure for a suspension system in a semitrailer according to claim 1, characterized in that: The transverse mounting sleeve (8) is provided with a primary auxiliary air spring (12) corresponding to the length direction of the steel skeleton assembly (2); the two ends of the primary auxiliary air spring (12) are respectively fixedly connected to one end of the straight-moving slide seat (9); and the other end of the second hydraulic telescopic rod (10) is rotatably connected to the straight-moving slide seat (9).

5. The flexible connection structure for a suspension system in a semitrailer according to claim 4, characterized in that: The steel skeleton assembly (2) is provided with displacement sensors (16) at the two end positions corresponding to the length direction thereof, and the transmission shaft end of the displacement sensor (16) is fixedly connected to the execution slide seat (9).

6. The flexible connection structure for a suspension system in a semitrailer according to claim 1, characterized in that: The first hydraulic telescopic rod (5) and the second hydraulic telescopic rod (10) are both provided with oil tanks, and the internal oil tank of the first hydraulic telescopic rod (5) is communicated with the internal oil tank of the second hydraulic telescopic rod (10) at a corresponding position.

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