CN114801617A - Independent suspension system of trailer - Google Patents

Abstract

The invention relates to the technical field of trailer suspensions, in particular to a trailer independent suspension system which comprises two wheel assemblies, two brake assemblies, a chassis bearing frame, a suspension connecting piece, a cantilever connecting piece and two damping components, wherein the two wheel assemblies are connected with the two brake assemblies through a connecting rod; the brake assembly is arranged at the axle center position of the wheel assembly and is fixedly connected with the cantilever combining piece, one side of the cantilever combining piece is movably connected with the front cross beam of the suspension combining piece, the other side of the cantilever combining piece is movably connected with the longitudinal beam of the suspension combining piece through the damping component, and the suspension combining piece is fixedly connected with the chassis bearing frame. The independent suspension system of the trailer provided by the invention has the advantages of simple structure and convenience in assembly, can attenuate the impact force of the ground on wheels and a frame, reduce the vibration of the frame, improve the overall braking performance of the trailer, ensure the smooth stability and the safety of goods of the trailer in the driving process, prolong the service life of parts of the trailer, occupy small space of a chassis of the trailer and save economic cost.

Description

Independent suspension system of trailer

Technical Field

The invention relates to the technical field of trailer suspensions, in particular to a trailer independent suspension system.

Background

The trailer is a wheeled vehicle which runs by means of traction of other vehicles and has no power driving device, is matched with a traction vehicle to form a complete and effective transportation and maneuvering platform, is widely used in the aspects of road freight transportation, container transportation market, equipment material conveying, equipment carrying and the like, and can improve the transportation capacity by times on the premise of not increasing a tractor and a driver. When the vehicle runs on uneven ground, the wheels drive the frame to vibrate vertically, so that the running stability of the vehicle is influenced. The suspension system is a general term for all force transmission connecting devices between a vehicle frame and an axle or a wheel, generally comprises an elastic component, a guide device and a shock absorber, can be used for transmitting force and torque acting between the wheel and the vehicle frame and buffering impact force transmitted to the vehicle frame or a vehicle body from an uneven road surface, and reduces the vibration of the vehicle frame through an elastic element so as to ensure that the vehicle can run smoothly. The suspension system is an important component of the trailer and has decisive influence and restriction on the driving smoothness of the trailer.

The suspension system can be divided into a non-independent suspension system and an independent suspension system. The dependent suspension adopts an integral axle to be connected with wheels at two sides, the wheels and the axle are suspended below a frame or a vehicle body through an elastic suspension system, and the dependent suspension has the advantages of simple structure and low cost. The independent suspension system adopts a disconnected axle, wheels on two sides are respectively connected with the frame through the independent suspensions, the wheels on the two sides are not affected when the wheels are impacted on the ground, and the independent suspension system can better adapt to the ground condition of unevenness so as to ensure the stability of the vehicle body.

The patent application with patent publication number CN111716975A provides a trailer independent suspension system, which comprises an axle, left and right torsion bar springs, left and right swing arms, a bidirectional cylinder type shock absorber, a reverse flexible limiting device and a truncated cone volute spring. Wherein, choose for use metal torsion bar spring as damping element, compound truncated cone volute spring as stop device, match two-way cylinder bumper shock absorber as supplementary damping element, the stack uses wire rope as elastic connecting piece's reverse flexible stop device, and whole cooperation can promote suspension system's ride comfort and reliability, satisfies cross-country driving and highway and goes the needs. However, the independent suspension system of the trailer has the advantages of relatively complex structural design, large occupied space of a chassis of the trailer, high cost of the torsion bar spring and difficult processing, is suitable for special vehicles and is not suitable for agricultural trailers and large trucks. Patent publication No. CN107471947A discloses a light American-structure semitrailer air suspension system, including: the left and right trailing arm bracket assemblies are fixedly connected with the frame; the front end of the left trailing arm assembly is hinged with the left trailing arm support assembly and the right trailing arm assembly through composite bushings, and the rear end of the left trailing arm assembly is fixedly connected with the trailer axle assembly; the front ends of the left and right shock absorbers are respectively hinged with the left and right trailing arm bracket assemblies, and the rear ends of the left and right shock absorbers are respectively hinged with the left and right trailing arm assemblies; a left and a right airbag brackets fixed on the frame; and the upper end and the lower end of the bearing air bag assembly are respectively fixed between the left air bag bracket and the right air bag bracket and between the rear ends of the left longitudinal arm assembly and the right longitudinal arm assembly. The air suspension system can effectively absorb the vibration generated when the vehicle runs and ensure the running smoothness of the semitrailer. However, the air suspension system is complex in structure and troublesome to process, and the adopted air airbag assembly is large in structural size, multiple in types of parts, high in assembly precision requirement, low in roll angle rigidity, troublesome to maintain and large in trailer chassis space.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the independent suspension system of the trailer, which has the advantages of simple structure and convenient assembly, can attenuate the impact load of the ground to wheels and a frame, reduce the vibration of the frame, improve the integral braking performance of the trailer, ensure the smooth stability and the safety of goods of the trailer in the driving process, prolong the service life of parts of the trailer, occupy small space of a chassis of the trailer, have light unsprung mass, achieve the aim of light weight and save the economic cost.

In order to solve the technical problem, the technical scheme of the invention is realized by the following modes:

a trailer independent suspension system comprises two wheel assemblies, two brake assemblies, a chassis bearing frame, a suspension connecting piece, a cantilever connecting piece and two damping components; the brake assembly is arranged at the axle center position of the wheel assembly and is fixedly connected with the cantilever combining piece, one side of the cantilever combining piece is movably connected with the front cross beam of the suspension combining piece, the other side of the cantilever combining piece is movably connected with the longitudinal beam of the suspension combining piece through the damping component, and the suspension combining piece is fixedly connected with the chassis bearing frame. The front and rear cross beams and the longitudinal beam of the suspension frame combining part are made of low-alloy high-strength structural steel, and the stability and the shock resistance are excellent.

Furthermore, the cantilever combining piece is in an A shape and comprises an outer swing rod, an inner swing rod, a cross beam, a connecting piece and an installation plate. One end of the outer swing rod is connected with the inner swing rod through the beam, rotating shafts are respectively arranged on the tail end surfaces of the outer swing rod and the inner swing rod, and through holes are formed in the rotating shafts and are parallel to the axis of the front beam; the other end of the outer swing rod is connected with the inner swing rod, and the connecting piece is arranged at the joint. The cross sections of the outer swing rod, the inner swing rod and the cross beam in the cantilever combining piece can be circular, rectangular or square. The mounting panel sets up the lateral surface of connecting piece, the inside through shaft hole that is equipped with of connecting piece. Be provided with a plurality of mounting holes on the mounting panel, the wheel assembly with the stopper assembly passes through bolt fixed mounting and is in on the mounting panel. One end of the connecting piece is an upward concave surface, and a rotating shaft hole is arranged in the concave surface in a penetrating mode and used for installing a damping assembly. An included angle formed between the outer swing rod and the inner swing rod is an acute angle, and the degree of the acute angle is 30-60 degrees, preferably 45 degrees. The structural design of the cantilever connecting piece is beneficial to dispersing and transmitting the impact force borne by the wheels to the cross beam when the trailer receives the side impact force.

Further, the front end of longeron and the left and right both ends of front beam are provided with the lug of two parallels respectively, pivot on the outer pendulum rod with lug on the longeron is mutually supported articulatedly, pivot on the interior pendulum rod with lug on the front beam is mutually supported articulatedly, and the trailer is at the in-process of traveling, the cantilever conjunction is reciprocating type swing along the axle center of lug, cushions impact load, reduces frame vibrations.

Further, damper assembly includes bumper shock absorber, elastic element and packing ring, the elastic element cover is established the outside of bumper shock absorber, the packing ring is installed elastic element's both ends, fixed mounting has the fixing base on the bottom side of longeron, fixing base integral type stamping forming, tensile strength is high. The shock absorber is respectively and movably connected with the fixed seat and the connecting piece. The packing ring adopts super reinforcing nylon material, has super wear-resisting, ageing resistance and heat resistance, and mechanical strength is high, can avoid elastic element to appear abnormal sound and the phenomenon of wearing and tearing when deformation, still plays the fixed action simultaneously, can prevent that elastic element from appearing the rotation to influence damping performance.

Furthermore, the elastic element is a spiral spring, and a double-pitch structural design is adopted, so that the excellent shock filtering and damping effects are ensured when the elastic element is in no-load, full-load, over-small pit and over-large pit, namely, the small-pitch position below the spiral spring is compressed and damped when the elastic element is in no-load, and the large-pitch position of the spring is compressed and damped when the elastic element is in full-load.

Furthermore, a shaft hole is formed in the fixed seat in a penetrating mode, hinge shafts with through holes are arranged at two ends of the shock absorber respectively, the upper hinge shaft and the lower hinge shaft are installed in the rotating shaft hole in the concave surface of the connecting piece and the shaft hole in the fixed seat respectively through positioning pin shafts, and the cushion ring is sleeved at two ends of the elastic element and closely attached to the fixed seat and the connecting piece respectively. When the trailer runs on bumps, the chassis of the trailer compresses the suspension frame connecting part to sink, the elastic element is compressed and deformed, and when the elastic element resets, the shock absorber pulls the elastic element to reset slowly, so that the shock is reduced. Through size design, the transverse distance between the elastic element and the mounting plate is 120mm, the rigidity of the wheel axle is effectively ensured, and the phenomenon of axle breakage caused by severe road conditions in the driving process can be effectively avoided.

Further, the independent suspension system of the trailer further comprises a limiting block, the limiting block is a mixture of rubber and a bolt, and the limiting block is installed on the bottom side face of the longitudinal beam between the fixing seat and the front cross beam through the bolt. The limiting block can be in an ellipsoid, a cylinder or a cone. The material of the limiting block can also be reinforced nylon material or thermoplastic plastic.

Furthermore, a first brake cable support is arranged on the front cross beam, and a second brake cable support is arranged on the cantilever combining piece. And the second brake cable support is fixedly arranged on the side surface of the inner swing rod, and the brake cables of the left brake assembly and the right brake assembly are led to the trailer chassis through the first brake cable support and the second brake cable support.

The swing joint among the above-mentioned technical scheme adopts articulated connection, and fixed connection adopts bolt fixed connection.

Compared with the prior art, the invention has the following beneficial effects:

(1) the cantilever combining piece adopts an A-shaped structural design, the stability of the structure of the cantilever combining piece is ensured by utilizing the stability of an internal triangle, the bent pipe of the internal swing rod of the cantilever combining piece is formed by integral punching, the tensile strength of the bent pipe cannot be reduced, and the stable reliability of the cantilever combining piece is ensured when the bent pipe is impacted by force. According to the force analysis of the mechanics principle, the bent pipe structure design of the cantilever joint member is beneficial to dispersing the impact force applied to the wheels when the trailer receives the side impact force, when the stress angle of the bent pipe of the inner swing rod is 45 degrees, the side stress is only half of the impact force, and the other half of the side stress is transmitted to the cross beam for dispersion; the cantilever connecting piece is hinged with the front cross beam of the suspension connecting piece, so that in the running process of the trailer, the cantilever connecting piece can do reciprocating longitudinal swing along the axis of the lifting lug, and when the trailer is braked or impacted, stress can be transmitted to the cross beam to buffer impact load and reduce the vibration of the frame; the transverse distance between the elastic element and the mounting plate is 120mm, so that the rigidity of the wheel axle is effectively ensured, and the phenomenon of axle breakage when the vehicle runs over a large pit can be effectively avoided.

(2) According to the invention, the elastic element is sleeved outside the shock absorber, and the shock absorber and the elastic element use the installation space together, so that the space of the trailer chassis can be saved, the body of the trailer is lightened, the span can be increased, the trailer has enough anti-roll performance, the unsprung mass is reduced, and the running smoothness and the acceleration performance of the trailer are improved; the shock absorption damper is sleeved in the elastic element, the hidden structure design saves space, and the elastic element can be pulled to slowly reset when being stretched and deformed, so that the vibration is reduced; the spiral spring adopting the double-pitch structural design is convenient to install, light in weight, small in occupied space and capable of reducing cost, the small-pitch position below the spiral spring compresses and absorbs shock when the trailer is empty, and the large-pitch position of the spring compresses and absorbs shock when the trailer is full load, so that the spiral spring is guaranteed to have excellent shock filtering and absorbing effects when the trailer is empty, full load, small pit and large pit are crossed.

(3) The longitudinal beam of the suspension frame connector is provided with the fixing seat which is integrally formed by punching, so that the suspension frame connector is light in weight design and high in tensile strength, and the concave surface on the connecting piece is matched with the fixing seat to stop and fix the elastic element; install the packing ring at elastic element both ends, the packing ring adopts super reinforcing nylon material, has advantages such as super wear-resisting, ageing resistance, good heat resistance and mechanical strength height, can avoid elastic element abnormal sound and wearing and tearing to appear when deformation, can also prevent that elastic element from appearing the rotation simultaneously to improve damping performance.

(4) According to the invention, the limit block is arranged on the longitudinal beam of the suspension frame combined part, and the rubber, the reinforced nylon or the thermoplastic material with super-strong wear resistance and heat resistance is adopted, so that the suspension frame can limit the stroke of the suspension frame when the trailer runs on a severe road surface, and the breakdown of the suspension frame is prevented.

(5) The suspension combining piece in the independent suspension system of the trailer provided by the invention is made of high-strength structural steel, is light in weight, can be continuously replaced, has high impact strength, is beneficial to enhancing the integral structural rigidity of the independent suspension system, and cannot deform when being subjected to large impact load for a long time.

(6) The integral structural design of the independent suspension system of the trailer provided by the invention has the advantages of simple structure, convenience in assembly and disassembly, convenience in maintenance and repair, capability of damping the impact force of wheels and a frame on the ground, ensuring the smoothness and the safety of goods in the driving process of the trailer, prolonging the service lives of tires and trailer parts, light unsprung mass, light weight of the trailer and economic cost saving.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic perspective view of an independent suspension system for a trailer;

FIG. 2 is an exploded view of the structure of the trailer independent suspension system;

FIG. 3 is a rear view of the trailer independent suspension system;

FIG. 4 is a schematic cross-sectional view taken along the plane A-A in FIG. 3;

FIG. 5 is a top view of the trailer independent suspension system;

FIG. 6 is a schematic cross-sectional view taken along the plane B-B in FIG. 5;

FIG. 7 is a schematic perspective view of a cantilever joint;

fig. 8 is a cross-sectional view of the cantilever coupler.

Description of reference numerals: the brake system comprises a wheel assembly 1, a brake assembly 2, a chassis bearing frame 3, a suspension assembly 4, a longitudinal beam 41, a front beam 42, a rear beam 43, a lifting lug 44, a cantilever assembly 5, an outer swing rod 51, an inner swing rod 52, a cross beam 53, a connecting piece 54, a mounting plate 55, a rotating shaft 56, a damping component 6, a shock absorber 61, a hinge shaft 611, an elastic element 62, a washer 63, a fixed seat 7, a limiting block 8, a first brake cable bracket 9 and a second brake cable bracket 10.

Detailed Description

The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it should be understood that the embodiments described herein are merely for purposes of illustration and explanation, and are not intended to limit the invention.

As can be seen from fig. 1 to 6, the present embodiment provides a trailer independent suspension system, which includes two wheel assemblies 1, two brake assemblies 2, a chassis bearing frame 3, a suspension connecting member 4, a cantilever connecting member 5, and two damping assemblies 6; the brake assembly 2 is arranged at the axle center position of the wheel assembly 1 and is fixedly connected with the cantilever combining piece 5 through a bolt, one side of the cantilever combining piece 5 is hinged with the front cross beam 42 of the suspension combining piece 4, the other side of the cantilever combining piece 5 is hinged with the longitudinal beam 41 of the suspension combining piece 4 through the damping component 6, and the suspension combining piece 4 is fixedly connected with the chassis bearing frame 3 through a bolt. The front and rear cross beams and the longitudinal beam of the suspension frame combining part 4 are made of low-alloy high-strength structural steel, and the stability and the shock resistance are excellent.

As shown in fig. 2 and 8, the cantilever joint 5 is a-shaped, which ensures structural stability and reliability. The cantilever binder 5 includes an outer swing link 51, an inner swing link 52, a cross beam 53, a connector 54, and a mounting plate 55. One end of the outer swing rod 51 is connected with the inner swing rod 52 through a cross beam 53, the tail end surfaces of the outer swing rod 51 and the inner swing rod 52 are respectively provided with a rotating shaft 56, and the rotating shaft 56 is internally provided with a through hole and is parallel to the axis of the front cross beam 42; the other end of the outer swing link 51 is connected to the inner swing link 52 and a link 54 is installed at the connection. The inner swing rod 52 is a bent pipe and is integrally formed in a punching mode, and tensile strength is guaranteed. The mounting plate 55 is disposed on the outer side of the connector 54, and a shaft hole is formed through the connector 54. The mounting plate 55 is provided with a plurality of mounting holes, and the wheel assembly 1 and the brake assembly 2 are fixedly mounted on the mounting plate 55 through bolts. One end of the connecting piece 54 is an upward concave surface, and a rotating shaft hole is arranged in the concave surface in a penetrating way and used for installing the damping component 6. As can be seen from fig. 7, the included angle α formed between the outer swing link 51 and the inner swing link 52 is 45 degrees. The structural design of the cantilever joint 5 is beneficial to dispersing the impact force on the wheels when the trailer receives the side impact force, the stress angle of the bent pipe of the inner swing rod 52 is 45 degrees, the side stress is only half of the impact force, and the other half is conducted to the cross beam 53 for dispersing.

As can be seen from fig. 2 to 4, two parallel lifting lugs 44 are respectively disposed at the front end of the longitudinal beam 41 and the left and right ends of the front cross beam 42, the rotating shaft 56 on the outer swing link 51 is mutually matched and hinged with the lifting lug 44 on the longitudinal beam 41, the rotating shaft 56 on the inner swing link 52 is mutually matched and hinged with the lifting lug 44 on the front cross beam 42, and the cantilever connection member 5 performs reciprocating swing along the axis of the lifting lug 44 during the driving process of the trailer, so as to buffer the impact load and reduce the frame vibration.

As can be known from fig. 2 and 3, the damping assembly 6 includes a damper 61, a coil spring 62 and a washer 63, the coil spring 62 is sleeved outside the damper 61, the washers 63 are installed at two ends of the coil spring 62, the fixing seat 7 is fixedly installed on the bottom side surface of the longitudinal beam 41, the fixing seat 7 is integrally formed by punching, and the tensile strength is high. The shock absorber 61 is respectively hinged with the fixed seat 7 and the connecting piece 54. Wherein, the bumper shock absorber 61 adopts hidden design, overlaps and establishes inside coil spring 62, practices thrift trailer chassis space. The helical spring 62 adopts a double-pitch structural design, so that excellent shock filtering and damping effects and comfort are guaranteed when the spring is in no-load, full-load, over-small pit and over-large pit, the small-pitch position below the helical spring compresses and damps shock when the spring is in no-load, and the large-pitch position of the spring compresses and damps shock when the spring is in full-load. The packing ring 63 is made of super reinforced nylon, so that the wear resistance and the heat resistance are good, the ageing resistance is high, the mechanical strength is high, the phenomenon that the spiral spring 62 generates abnormal sound and is worn when deformed can be avoided, the fixing effect is achieved, the spiral spring 62 can be prevented from rotating, and the damping performance is influenced.

As can be seen from fig. 2 and 4, the fixing seat 7 is internally provided with a shaft hole, two ends of the shock absorber 61 are respectively provided with a hinge shaft 611 with a through hole, the upper hinge shaft 611 and the lower hinge shaft 611 are respectively installed in the shaft hole inside the concave surface of the connecting member 54 and the shaft hole inside the fixing seat 7 through a positioning pin shaft, and the washers 63 are sleeved at two ends of the coil spring 62 and are respectively tightly attached to the fixing seat 7 and the connecting member 54. During the bump running of the trailer, the chassis of the trailer compresses the suspension connecting part 4 to sink, the spiral spring 62 is compressed and deformed, and when the spiral spring 62 is reset, the shock absorber 61 pulls the spiral spring 62 to reset slowly, so that the shock is reduced.

Through size design, the height of the chassis relative to the ground can be adjusted to be more than 0.4 m so as to adapt to different road conditions; the transverse distance between the spiral spring 62 and the mounting plate 55 is 120mm, so that the rigidity of the wheel axle is effectively ensured, and the phenomenon of axle breakage caused by severe road conditions in the driving process can be effectively avoided.

As can be seen from fig. 2, the independent suspension system of the trailer further comprises a limit block 8 in an ellipsoid shape, and the limit block 8 is a mixture of rubber and bolts. As shown in fig. 4, the limiting block 8 is mounted on the bottom side of the longitudinal beam 41 between the fixing seat 7 and the front cross beam 42 by using bolts. When the trailer works in overload, the suspension joint part 4 sinks, the coil spring 62 is compressed and deformed, and the limiting block 8 is contacted with the cantilever joint part 5, so that the shock absorber 61 and the coil spring 62 are prevented from being damaged in overload.

As can be seen from fig. 2 and 3, the front cross member 42 is provided with a first brake cable bracket 9, and the arm joint 5 is provided with a second brake cable bracket 10. The second brake cable bracket 10 is fixedly mounted on the side surface of the inner swing link 52, as shown in fig. 7. The brake cables of the left brake assembly 2 and the right brake assembly 2 are led to the trailer chassis through a first brake cable bracket 9 and a second brake cable bracket 10.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. A trailer independent suspension system comprises two wheel assemblies (1), two brake assemblies (2) and a chassis bearing frame (3), and is characterized by further comprising a suspension combining piece (4), a cantilever combining piece (5) and two damping assemblies (6); the brake assembly (2) is arranged at the axle center position of the wheel assembly (1) and is fixedly connected with the cantilever combining piece (5), one side of the cantilever combining piece (5) is movably connected with a front cross beam (42) of the suspension combining piece (4), the other side of the cantilever combining piece (5) is movably connected with a longitudinal beam (41) of the suspension combining piece (4) through the damping component (6), and the suspension combining piece (4) is fixedly connected with the chassis bearing frame (3).

2. A trailer independent suspension system as claimed in claim 1 wherein said cantilever engagement member (5) is "a" shaped comprising an outer swing link (51), an inner swing link (52), a cross member (53), a connecting member (54) and a mounting plate (55); one end of the outer swing rod (51) is connected with the inner swing rod (52) through the cross beam (53), rotating shafts (56) are respectively arranged on the tail end surfaces of the outer swing rod (51) and the inner swing rod (52), and through holes are formed in the rotating shafts (56) and are parallel to the axis of the front cross beam (42); the other end of the outer swing rod (51) is connected with the inner swing rod (52) and is provided with the connecting piece (54) at the connecting part; the mounting plate (55) is arranged on the outer side face of the connecting piece (54), and a shaft hole is formed in the connecting piece (54) in a penetrating mode.

3. A trailer independent suspension system as claimed in claim 2, wherein two parallel lifting lugs (44) are respectively arranged at the front end of the longitudinal beam (41) and the left and right ends of the front cross beam (42), the rotating shaft (56) on the outer swing link (51) is mutually matched and hinged with the lifting lugs (44) on the longitudinal beam (41), and the rotating shaft (56) on the inner swing link (52) is mutually matched and hinged with the lifting lugs (44) on the front cross beam (42).

4. A trailer independent suspension system as claimed in claim 2, wherein said shock absorbing assembly (6) comprises a shock absorber (61), an elastic element (62) and a washer (63), said elastic element (62) is sleeved outside said shock absorber (61), said washer (63) is installed at two ends of said elastic element (62) and is tightly jointed with said fixed seat (7) and said connecting piece (54) respectively; and a fixed seat (7) is fixedly arranged on the bottom side surface of the longitudinal beam (41), and two ends of the shock absorber (61) are respectively arranged on the fixed seat (7) and the connecting piece (54).

5. A trailer independent suspension system as claimed in claim 4, characterized in that an axle hole is arranged through the inside of the fixed base (7), and the two ends of the shock absorber (61) are respectively provided with a hinge shaft (611) with a through hole, and the hinge shaft (611) is arranged in the axle holes inside the connecting piece (54) and the fixed base (7) through a positioning pin shaft.

6. A trailer independent suspension system as claimed in claim 4 wherein said resilient member (62) is a coil spring in a double pitch arrangement.

7. A trailer independent suspension system as claimed in claim 1 further comprising a stop block (8), said stop block (8) being fixedly mounted on the bottom side of said longitudinal beam (41) in front of said shock assembly (6).

8. A trailer independent suspension system according to claim 1, characterised in that a first brake cable bracket (9) is arranged on the front cross member (42) and a second brake cable bracket (10) is arranged on the cantilever engagement member (5).

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