Air suspension and its unloading arm

Abstract

The present application relates to a kind of air suspension and its unloading support arm, unloading support arm is bent strip-shaped plate and has Z-shaped longitudinal section perpendicular to its width direction, unloading support arm includes first support arm section, second support arm section, third support arm section and fourth support arm section sequentially connected along its length direction, second support arm section has second bisector longitudinal section perpendicular to the width direction of unloading support arm and bisects second support arm section, fourth support arm section has fourth bisector longitudinal section perpendicular to the width direction of unloading support arm and bisects fourth support arm section, the plane where second bisector longitudinal section is offset with the plane where fourth bisector longitudinal section is set distance.The present application can ensure that air bag is not unloading in the case where the overall volume weight of bracket is unchanged, air suspension volume weight minimization is considered, cost minimization, safety factor maximization and life maximization.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air suspension for drive axle, in particular to trailer air suspension and its unloading arm. BACKGROUND

[0002] The function of the suspension device of the vehicle is to reduce the oscillation caused by poor road conditions, and to enhance the adhesion of the vehicle to the ground when the vehicle is turning sharply or braking sharply. The air suspension has the advantages of low stiffness, non-linear stiffness, adjustable stiffness, adjustable height, light weight and low noise. Due to the above advantages, the air suspension is more and more widely used in various vehicles.

[0003] In the prior art, two sets of air suspensions are generally installed on each axle (or axle), and two brackets of the two sets of air suspensions are respectively connected vertically to different positions of the axle. Each bracket has a Z-shaped longitudinal section that is perpendicular to the width direction of the bracket and divides the bracket. On the one hand, in order to improve the roll stiffness of the air suspension and reduce the risk of rollover, the distance between the longitudinal symmetry axes of the two brackets should be as large as possible, that is, the bracket should be as close as possible to the outer wheel, that is, the Z-shaped longitudinal section should be as close as possible to the outer wheel. On the other hand, the arm of the air suspension in most of the prior art is made by rolling and bending process, and the width of the arm is consistent, so it cannot have a complex shape. Since the size of the air bag that meets the requirements is generally larger than the width of the bracket that meets the requirements along the width direction of the bracket, in order to prevent the air bag from touching the wheel, two air bag mounting schemes are generally used. The first air bag mounting scheme is to increase the width of the bracket, and the mounting position of the air bag is on the Z-shaped longitudinal section of the bracket. The second air bag mounting scheme is to change the mounting position of the air bag without changing the bracket and the air bag, and the mounting position of the air bag deviates from the Z-shaped longitudinal section of the bracket, and the air bag is connected to the bracket through a bag connecting plate. The first air bag mounting scheme will increase the overall volume and weight of the air suspension, and increase the cost. The second air bag mounting scheme is the commonly used air bag mounting scheme, which will cause the unloading of the bracket, which will cause the decrease of the safety factor of the bracket, the roll of the air bag, the folding of the air bag, and the like. The service life of the bracket is affected, and the piston of the air bag is required to be higher. How to balance the minimization of the volume and weight of the air suspension, the minimization of the cost, the maximization of the safety factor, and the maximization of the service life is a technical problem to be solved in the field. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is how to balance the minimization of the volume and weight of the air suspension, the minimization of the cost, the maximization of the safety factor, and the maximization of the service life.

[0005] To solve the above technical problems, the present application provides an unloading supporting arm of an air suspension, which is a bent strip-shaped plate and has a Z-shaped longitudinal section perpendicular to the width direction thereof, and comprises a first supporting arm section, a second supporting arm section, a third supporting arm section and a fourth supporting arm section connected in sequence along the length direction thereof, a bending angle A being formed between the second supporting arm section and the third supporting arm section, and a bending angle B being formed between the third supporting arm section and the fourth supporting arm section,

[0006] The second supporting arm section has a second bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the second supporting arm section, and the fourth supporting arm section has a fourth bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the fourth supporting arm section, and the plane where the second bisector longitudinal section is located is offset from the plane where the fourth bisector longitudinal section is located by a certain distance.

[0007] In an embodiment of the present application, the certain distance is 50-90 mm.

[0008] In an embodiment of the present application, the second supporting arm section has a second width dimension measured along the width direction of the unloading supporting arm, and the fourth supporting arm section has a fourth width dimension measured along the width direction of the unloading supporting arm, and the second width dimension is greater than the fourth width dimension.

[0009] In an embodiment of the present application, the second supporting arm section has two second side edges extending along the length direction of the unloading supporting arm, and the fourth supporting arm section has two fourth side edges extending along the length direction of the unloading supporting arm, one of the second side edges on one side of the unloading supporting arm is arranged in flush with one of the fourth side edges, and the other of the second side edges on the other side of the unloading supporting arm is arranged not in flush with the other of the fourth side edges.

[0010] In an embodiment of the present application, the first supporting arm section has a first bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the first supporting arm section, and the plane where the first bisector longitudinal section is located is overlapped with the plane where the second bisector longitudinal section is located.

[0011] In an embodiment of the present application, the first supporting arm section has a first width dimension measured along the width direction of the unloading supporting arm, and the second supporting arm section has a second width dimension measured along the width direction of the unloading supporting arm, and the first width dimension is smaller than the second width dimension.

[0012] In one embodiment of the present application, the first bracket section has two first side edges extending along the length direction of the unloading bracket, the second bracket section has two second side edges extending along the length direction of the unloading bracket, and the first side edge and the second side edge on the same side of the unloading bracket are not flush.

[0013] In one embodiment of the present application, the unloading bracket is forged.

[0014] The present application also provides an air suspension, comprising:

[0015] the unloading bracket;

[0016] a front bracket of the bracket, the free end of the first bracket section being bolted to the front bracket of the bracket, the front bracket of the bracket being connected to the frame;

[0017] a shock absorber, one end of the shock absorber being bolted to the front bracket of the bracket, the other end of the shock absorber being bolted to the fixed end of the first bracket section;

[0018] an accessory, the accessory being used to connect and fix the second bracket section to the axle;

[0019] an air bag, the air bag being installed on the fourth bracket section and being used to connect to the frame, the air bag having a fifth longitudinal section parallel to the elastic direction of the air bag and bisecting the air bag, the plane where the fourth bisecting longitudinal section is located overlapping the plane where the fifth longitudinal section is located.

[0020] In one embodiment of the present application, the accessory comprises a U-shaped bolt and an adapter pressing plate, the U-shaped bolt being used to connect and fix the axle to the second bracket section, the adapter pressing plate being separately arranged from the unloading bracket and the adapter pressing plate matching the shape and size of the axle to be connected, the adapter pressing plate being arranged between the unloading bracket and the axle and between the axle and the U-shaped bolt.

[0021] The above technical solution of the present application has the following advantages compared with the prior art:

[0022] 1) The unloading bracket of the air suspension of the present application, the second bracket section connected to the axle having a second bisecting longitudinal section, and the fourth bracket section connected to the air bag having a fourth bisecting longitudinal section, the plane where the second bisecting longitudinal section is located being arranged to deviate from the plane where the fourth bisecting longitudinal section is located by a set distance, so that the air bag can be unloaded without deviating from the set distance while ensuring that the overall volume and weight of the bracket remain unchanged, and the minimization of the volume and weight of the air suspension, the minimization of the cost, the maximization of the safety factor, and the maximization of the service life are taken into account;

[0023] 2) The air suspension unloading bracket of the present application, the bracket is forged into shape, and some complex-shaped structures can be integrally forged, thereby reducing the overall number of parts of the bracket;

[0024] 3) The air suspension unloading bracket of the present application, the adapter plate and the bracket are in a split structure, and the same bracket can be used in connection with various specifications and sizes of axles by replacing adapter plates of different sizes. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the accompanying drawings.

[0026] Figure 1 isometric view of the unloading bracket disclosed in the present application;

[0027] Figure 2 top view of the unloading bracket disclosed in the present application;

[0028] Figure 3 schematic assembly view of the air suspension disclosed in the present application;

[0029] Figure 4 schematic exploded view of the air suspension disclosed in the present application.

[0030] DESCRIPTION OF DRAWINGS: 1, unloading bracket; 11, first bracket segment; 110, first bisecting longitudinal section; 111, 112, first side edge; 12, second bracket segment; 120, second bisecting longitudinal section; 121, 122, second side edge; 13, third bracket segment; 14, fourth bracket segment; 140, fourth bisecting longitudinal section; 141, 142, fourth side edge; 2, bracket front support; 3, shock absorber; 4, accessory; 41, U-shaped bolt; 42, adapter plate; 5, axle; 6, air bag. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0032] Example 1

[0033] Reference Figure 1 and Figure 2As shown in the legend, an air suspension unloading arm 1, the unloading arm 1 is a bent strip-shaped plate and has a Z-shaped longitudinal section perpendicular to the width direction, the unloading arm 1 includes a first arm section 11, a second arm section 12, a third arm section 13 and a fourth arm section 14 connected in sequence along the length direction, the second arm section 12 and the third arm section 13 form a bending angle A, the third arm section 13 and the fourth arm section 14 form a bending angle B,

[0034] The second arm section 12 has a second bisector longitudinal section 120 perpendicular to the width direction of the unloading arm 1 and bisecting the second arm section 12, the fourth arm section 14 has a fourth bisector longitudinal section 140 perpendicular to the width direction of the unloading arm 1 and bisecting the fourth arm section 14, the plane where the second bisector longitudinal section 120 is located is offset from the plane where the fourth bisector longitudinal section 140 is located by a set distance.

[0035] Specifically, in order to enable those skilled in the art to more fully understand the unloading arm, the following specific description is made. The length direction of the first arm section, the second arm section and the fourth arm section is substantially the X-axis direction, the width direction of the first arm section, the second arm section, the third arm section and the fourth arm section is the Y-axis direction, the thickness direction of the first arm section, the second arm section and the fourth arm section is the Z-axis direction, the plane where the second bisector longitudinal section is located and the plane where the fourth bisector longitudinal section is located are both perpendicular to the Y-axis direction. The second arm section connected with the axle has a second bisector longitudinal section, the fourth arm section connected with the air bag has a fourth bisector longitudinal section, the plane where the second bisector longitudinal section is located is offset from the plane where the fourth bisector longitudinal section is located by a set distance, which can ensure the overall volume of the bracket without changing the weight, make the air bag not unloading, and take into account the minimization of the volume and weight of the air suspension, the minimization of the cost, the maximization of the safety factor and the maximization of the service life.

[0036] In the preferred embodiment of the present embodiment, the set distance is 50-90mm. Specifically, the set distance is 50mm, 60mm, 70mm, 80mm or 90mm.

[0037] In the preferred embodiment of the present embodiment, the second arm section 12 has a second width dimension measured along the width direction of the unloading arm 1, the fourth arm section 14 has a fourth width dimension measured along the width direction of the unloading arm 1, and the second width dimension is greater than the fourth width dimension. Specifically, the Y-axis direction dimension of the second arm section is the second width dimension, and the Y-axis direction dimension of the fourth arm section is the fourth width dimension.

[0038] In the preferred embodiment of the present application, the second arm section 12 has two second side edges 121, 122 extending along the length direction of the unbalanced load supporting arm 1, and the fourth arm section 14 has two fourth side edges 141, 142 extending along the length direction of the unbalanced load supporting arm 1. One of the second side edges 121 on one side of the unbalanced load supporting arm 1 is arranged flush with one of the fourth side edges 141, and the other second side edge 122 on the other side of the unbalanced load supporting arm 1 is arranged not flush with the other fourth side edge 142. Specifically, the third arm section has two third side edges extending along the length direction of the unbalanced load supporting arm, the second and fourth side edges are straight edges, one of the third side edges is a straight edge, and the other third side edge is an oblique edge. One of the second side edges on one side of the unbalanced load supporting arm is arranged flush with one of the fourth side edges and connected by the straight third side edge, and the other second side edge on the other side of the unbalanced load supporting arm is arranged not flush with the other fourth side edge and connected by the oblique third side edge.

[0039] In the preferred embodiment of the present application, the first arm section 11 has a first bisected longitudinal section 110 perpendicular to the width direction of the unbalanced load supporting arm 1 and bisecting the first arm section 11, and the plane where the first bisected longitudinal section 110 is located overlaps with the plane where the second bisected longitudinal section 120 is located. The plane where the first bisected longitudinal section is located is perpendicular to the Y-axis direction.

[0040] In the preferred embodiment of the present application, the first arm section 11 has a first width direction dimension measured along the width direction of the unbalanced load supporting arm 1, and the second arm section 12 has a second width direction dimension measured along the width direction of the unbalanced load supporting arm 1. The first width direction dimension is smaller than the second width direction dimension. Specifically, the Y-axis direction dimension of the first arm section is the first width dimension, and the Y-axis direction dimension of the second arm section is the second width dimension.

[0041] In the preferred embodiment of the present application, the first arm section 11 has two first side edges 111, 112 extending along the length direction of the unloading arm, the second arm section 12 has two second side edges 121, 122 extending along the length direction of the unloading arm, the first side edge 111 on one side of the unloading arm is not flush with the second side edge 121, and the first side edge 112 on the other side of the unloading arm is not flush with the second side edge 122. Specifically, the first side edge and the second side edge are straight edges, one of the first side edges on one side of the unloading arm is flush with one of the second side edges and connected by a circular arc surface, and the other of the first side edges on the other side of the unloading arm is not flush with the other of the second side edges and connected by a circular arc surface.

[0042] In the preferred embodiment of the present application, the unloading arm 1 is forged. The bracket can be integrally forged for some complex structures, thereby reducing the overall number of parts of the bracket.

[0043] The bending angle A and the bending angle B are both rounded corners, and the corners of the unloading arm are all rounded.

[0044] Referring to Figure 3 and Figure 4 An air suspension, as shown in the accompanying drawings, comprises:

[0045] The unloading arm 1 described above;

[0046] The arm front support 2 is bolted to the free end of the first arm section 11, and the arm front support 2 is connected to the frame;

[0047] The shock absorber 3 is hingedly connected to the arm front support 2 at one end, and hingedly connected to the fixed end of the first arm section 11 at the other end;

[0048] The accessory 4 is used to connect and fix the second arm section 12 to the axle 5;

[0049] The air bag 6 is installed on the fourth arm section 14 and used to connect to the frame, the air bag 6 has a fifth longitudinal section parallel to the elastic direction of the air bag 6 and equally dividing the air bag 6, and the plane where the fourth equally dividing longitudinal section is located overlaps with the plane where the fifth longitudinal section is located.

[0050] The front support of the above-mentioned supporting arm is connected to the connecting hole of the free end of the first supporting arm segment through a polyurethane bushing bolt, and the above-mentioned shock absorber is connected to the connecting hole on the front support of the supporting arm and the connecting seat on the first supporting arm segment through a connecting shaft. The above-mentioned air bag is connected to the connecting hole on the fourth supporting arm segment, and the above-mentioned connecting hole is located on the fourth bisecting longitudinal section.

[0051] In an embodiment of the present application, the above-mentioned accessory 4 comprises a U-shaped bolt 41 and an adaptive pressing plate 42, the U-shaped bolt 41 is used to connect and fix the above-mentioned axle 5 and the above-mentioned second supporting arm segment 12, the adaptive pressing plate 42 is separately arranged from the above-mentioned unloading supporting arm 1, the shape and size of the adaptive pressing plate 42 match the axle to be connected, and the adaptive pressing plate 42 is arranged between the above-mentioned unloading supporting arm 1 and the axle 5 and between the above-mentioned axle 5 and the above-mentioned U-shaped bolt 41. The adaptive pressing plate and the bracket are in a separate structure, and by replacing adaptive pressing plates of different sizes, the same bracket can be applied to connect axles of various specifications and sizes.

[0052] The following is a comparison between the present application and the prior art:

[0053] The prior art 13-ton semi-trailer suspension has a total of 23 types and 34 parts (including bolts and nuts) on one side, and the air bag is offset by 80 mm. In order to ensure the structural strength, thicker and wider brackets need to be used, an air bag connecting plate is needed below the air bag, and a steel piston with higher strength needs to be selected for the air bag.

[0054] The unloading supporting arm of the present application has a total of 16 types and 27 parts (including bolts and nuts), and the air bag is not subjected to unloading force. The service life of the air bag, bracket and the like can be effectively improved. The front support of the supporting arm and the shock absorber can be borrowed from the existing structure, the unloading supporting arm (the two unloading supporting arms on the same vehicle are symmetrical), 正常生产的这些东西本身就是需要重新开模具的 The adaptive pressing plate can be replaced according to the specifications of the axle to be used.

[0055] Compared with the 13-ton structure scheme in the prior art, the forged bracket scheme has fewer parts, simpler assembly, and relatively shorter production rhythm. The relatively simple system structure has a relatively reduced probability of abnormality. The fewer parts can also reduce the pressure of inventory spare parts. The disadvantage of the forged bracket scheme is that the left and right unloading supporting arms cannot be used universally, two sets of symmetrical molds need to be made, and the development cost is relatively high in the early stage.

[0056] The same simulation operation is performed on the unloading supporting arm (hereinafter referred to as the forged bracket) and the prior art bracket (hereinafter referred to as the existing 13-ton bracket), and the strength is checked according to the 13-ton axle. By comparing the stress distribution results, the advantages and disadvantages of the two schemes are determined.

[0057] According to the calculation of the axle load of 13 tons, the forged bracket grid adopts C3D10 unit, the first bracket arm free end displacement degree of freedom is constrained, and the rotation degree of freedom is released; the air bag Y direction displacement degree of freedom is constrained, and other degrees of freedom are released; 6 kinds of working conditions are analyzed; 1, only 200KN bolt pretightening force is applied; 2, 25KN (1.4 times loading) is applied to the shock absorber bolt oblique side; 3, 130KN (2 times safety factor) is applied vertically; 4, 65KN (1 times safety factor) is applied vertically, and 65KN (2.5 times safety factor) is applied laterally; 5, 65KN (1 times safety factor) is applied vertically, and-65KN (2.5 times safety factor) is applied laterally; 6, the axle position is constrained, and 50KN downward force is applied to the first bracket arm free end, and the bracket front and back stiffness changes are compared through the free end center displacement.

[0058] The working condition 1 above, the maximum stress of the forged bracket using U-shaped bolt is located inside the fillet, the tensile stress is 869MPa, which meets the use requirements; the stress position of the existing 13-ton suspension U-shaped bolt is also inside the fillet, the tensile stress is 833.8MPa, which meets the use requirements of 10.9 grade bolt;

[0059] The working condition 1 above, the maximum stress of the forged bracket under the U-shaped bolt 200KN bolt pretightening force is located in the inner fillet of the weight-reducing groove, the maximum tensile stress is 282MPa; which is far less than the yield strength of spring steel 1300MPa, and meets the use requirements; the working condition 1 above, the maximum stress of the existing 13-ton bracket under the U-shaped bolt 200KN bolt pretightening force is located inside the bolt positioning hole, the tensile stress is 314MPa; which is far less than the yield strength of spring steel 1300MPa, and meets the use requirements;

[0060] The working condition 2 above, the forged bracket under the 25KN oblique tension of the shock absorber, the local maximum stress is located at the machining fillet, the maximum tensile stress is 312MPa; which is far less than the yield strength of spring steel 1300MPa, and meets the use requirements; the working condition 2 above, the existing 13-ton bracket under the 25KN oblique tension of the shock absorber, the tensile stress of the I-beam lower side is 581MPa; which has exceeded the tensile strength of the material ZG500 500MPa, the safety factor is low, and the fatigue life is short.

[0061] The working condition 3 above, the forged bracket under the vertical stress of 130KN, the maximum stress is located at the fillet of the weight-reducing groove side, the maximum tensile stress is 708MPa; the stress of the corresponding position of the conventional 13-ton bracket bending dangerous area is only 489MPa; which is less than the yield strength of spring steel 1300MPa, and meets the use requirements; the working condition 3 above, the existing 13-ton bracket under the vertical stress of 130KN, the maximum stress is located inside the free end, the tensile stress is 773MPa; the tensile stress of the bending area is 712MPa; which is less than the yield strength of spring steel 1300MPa, and meets the use requirements.

[0062] The above working condition 4, the forged bracket is in vertical full load and receives lateral force, the maximum stress is located at the root of the first bracket arm free end, the maximum tensile stress is 698 MPa; less than the yield strength of spring steel 1300 MPa, meets the use requirements; the above working condition 4, the existing 13-ton bracket is in vertical full load and receives lateral force, the maximum stress is located at the inside of the free end, the tensile stress is 657 MPa; less than the yield strength of spring steel 1300 MPa, meets the use requirements;

[0063] The above working condition 5, the forged bracket is in vertical full load and receives lateral force, the maximum stress is located at the root of the first bracket arm free end, the maximum tensile stress is 698 MPa; less than the yield strength of spring steel 1300 MPa, meets the use requirements; the above working condition 5, the existing 13-ton bracket is in vertical full load and receives lateral force, the maximum stress is located at the inside of the free end, the tensile stress is 657 MPa; less than the yield strength of spring steel 1300 MPa, meets the use requirements;

[0064] The above working condition 6, the vertical stiffness of the forged bracket is 5682.5 N / mm, the vertical stiffness of the 13-ton bracket is 5641.9 N / mm, the stiffness difference between the two is 0.72%, which has no effect on the overall stiffness.

[0065] Through the above multi-working condition stress comparison, the maximum stress of the forged bracket scheme is obviously reduced, and the stress in the bending danger area is reduced by about 30%;

[0066] According to the above comparison results, the overall stress of the forged bracket arm is reduced, the same material can have a higher safety factor and service life, or a low-cost material with reduced performance can meet the original use effect.

[0067] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An unloading supporting arm of an air suspension, the unloading supporting arm being a bent strip-shaped plate and having a Z-shaped longitudinal section perpendicular to a width direction of the unloading supporting arm, the unloading supporting arm comprising a first supporting arm section, a second supporting arm section, a third supporting arm section and a fourth supporting arm section connected in sequence along a length direction of the unloading supporting arm, a bending angle A being formed between the second supporting arm section and the third supporting arm section, a bending angle B being formed between the third supporting arm section and the fourth supporting arm section, the second supporting arm section having a second bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the second supporting arm section, the fourth supporting arm section having a fourth bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the fourth supporting arm section, a plane where the second bisector longitudinal section is located being offset from a plane where the fourth bisector longitudinal section is located by a set distance. characterized in that 2. The unloading supporting arm of claim 1, wherein the unloading supporting arm is forged into shape.

3. The unloading supporting arm of claim 1, wherein the first supporting arm section has a first width dimension measured along the width direction of the unloading supporting arm, the second supporting arm section has a second width dimension measured along the width direction of the unloading supporting arm, the fourth supporting arm section has a fourth width dimension measured along the width direction of the unloading supporting arm, the first width dimension and the fourth width dimension are both smaller than the second width dimension.

4. The unloading supporting arm of claim 1, wherein the second supporting arm section has two second side edges extending along the length direction of the unloading supporting arm, the fourth supporting arm section has two fourth side edges extending along the length direction of the unloading supporting arm, one of the second side edges and one of the fourth side edges located on one side of the unloading supporting arm are arranged in a flush manner, the other of the second side edges and the other of the fourth side edges located on the other side of the unloading supporting arm are arranged in a non-flush manner.

5. The unloading supporting arm of claim 1, wherein the third supporting arm section has two third side edges extending along the length direction of the unloading supporting arm, the second side edges and the fourth side edges are both straight edges, one of the third side edges is a straight edge, the other of the third side edges is an oblique edge, one of the second side edges and one of the fourth side edges located on one side of the unloading supporting arm are arranged in a flush manner and connected by the straight edge of the third side edges, the other of the second side edges and the other of the fourth side edges located on the other side of the unloading supporting arm are arranged in a non-flush manner and connected by the oblique edge of the third side edges.

6. The unloading supporting arm of claim 1, wherein the set distance is 50-90 mm.

2. The unloading of the air suspension of the support arm according to claim 1, characterized in that, 7. The unloading supporting arm of claim 1, wherein the first supporting arm section has a first bisector longitudinal section perpendicular to the width direction of the unloading supporting arm and bisecting the first supporting arm section, a plane where the first bisector longitudinal section is located overlaps a plane where the second bisector longitudinal section is located.

3. The unloading arm of an air suspension according to claim 1, characterized in that 8. The unloading supporting arm of claim 1, wherein the first supporting arm section has two first side edges extending along the length direction of the unloading supporting arm, the second supporting arm section has two second side edges extending along the length direction of the unloading supporting arm, the first side edges and the second side edges located on the same side of the unloading supporting arm are arranged in a non-flush manner.

4. The unloading of the air suspension of the arm, according to claim 1, characterized in that, 9. The unloading supporting arm of claim 1, wherein the unloading supporting arm comprises:

5. An air suspension, characterized by 10. The unloading supporting arm of any one of claims 1-4.

11. A front supporting arm bracket, the front supporting arm bracket being connected to a free end of the first supporting arm section by a bolt, the front supporting arm bracket being connected to a vehicle frame. ​ A shock absorber, one end of which is hingedly connected to the front support of the bracket, the other end of which is hingedly connected to the fixed end of the first bracket segment; An accessory, which is used to connect and fix the second bracket segment with the axle; An air bag, which is installed on the fourth bracket segment and used to connect with the frame, the air bag has a fifth longitudinal section parallel to the elastic direction of the air bag and bisecting the air bag, the plane where the fourth bisecting longitudinal section is located overlaps with the plane where the fifth longitudinal section is located.

6. The air suspension of claim 5, wherein, The accessory includes a U-shaped bolt and an adapter plate, the U-shaped bolt connects and fixes the axle with the second bracket segment, the adapter plate is separately arranged with the unloading bracket and the adapter plate is matched with the shape and size of the axle to be connected, the adapter plate is arranged between the unloading bracket and the axle and between the axle and the U-shaped bolt.

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