Trailer connecting structure

Abstract

The invention discloses a trailer connecting structure in the technical field of trailer connection, and aims to solve the problem of poor safety between a tractor and a trailer in the prior art. The method comprises the steps that a certain inclination angle difference is allowed to exist between a trailer and a tractor through rotary connection of a traction limiting rod and a limiting shaft sleeve, even if the trailer turns over, the tractor can be prevented from being involved through the rotary connection relation, and the anti-rollover function is achieved; through sliding connection between the traction limiting rod and the limiting shaft sleeve, distance redundancy exists when the trailer and the tractor are impacted, the impact is buffered through the first damping elastic piece and the second damping elastic piece, and the probability that the tractor is impacted and damaged by the trailer or the trailer breaks the connecting structure to be disengaged from the tractor is reduced; meanwhile, the traction rod is used as a medium to allow rotation with an axle of the trailer, and the turning requirement is met; in conclusion, the safety is improved on the premise that the basic functions of connection and steering of the trailer are not affected, and the safety of the tractor and the trailer is guaranteed.

Description

Technical Field

[0001] The invention relates to a trailer connection structure and belongs to the technical field of trailer connection. Background Art

[0002] When performing emergency rescue missions, emergency towing vehicles often need to travel on harsh road conditions and dangerous environments. The weight of the tractor is generally lower than that of the trailer, and its handling ability is limited. When the poor road conditions cause the tractor to constantly accelerate, decelerate, or start and stop, the connection structure between the tractor and the trailer is easily damaged under large impacts. At the same time, poor road conditions can easily cause the trailer to sway from side to side, and the connection structure can be easily damaged, and the tractor can also sway through the conduction of the connection structure, causing a safety hazard. When the trailer sways too much from side to side and overturns, the tractor will also be affected.

[0003] Therefore, the existing trailer connection structure cannot guarantee the safety of the tractor. Summary of the invention

[0004] The purpose of the present application is to overcome the deficiencies in the prior art and provide a trailer connection structure with high safety.

[0005] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: The present application provides a trailer connection structure, comprising: A drawbar, one end of which is rotatably connected to the axle of the trailer, and the other end of which is provided with a limited position sleeve; A traction limit rod is sleeved into the limit shaft sleeve and is rotatably and slidably connected with the limit shaft sleeve; the traction limit rod is provided with an anti-slipping piece at a certain distance from the limit shaft sleeve, and the traction rod sleeve is provided with a first shock-absorbing elastic piece, and the position of the first shock-absorbing elastic piece is between the anti-slipping piece and the limit shaft sleeve; a widened section is formed at one end of the traction limit rod away from the traction rod, and the traction rod is also sleeved with a second shock-absorbing elastic piece, and the position of the second shock-absorbing elastic piece is between the widened section and the limit shaft sleeve; One end of the traction limit rod close to the widened section is used for connecting with the traction vehicle.

[0006] In some embodiments of the present application, the traction rod is a cylindrical object, and the traction rod is fixedly connected to the limiting sleeve through a limiting plate; The anti-slip member is a slotted nut, and the anti-slip member is detachably connected to the traction limit rod through a thread, and the traction rod is provided with a pin hole corresponding to the slotted position of the anti-slip member, and the pin is inserted into the slot of the anti-slip member through the pin hole to fix the position of the anti-slip member on the traction limit rod; The traction rod is provided with an openable and closable maintenance panel at a position corresponding to the anti-slip component. In some embodiments of the present application, a steering rocker arm is further included, wherein one end of the steering rocker arm is provided with a first connecting pin shaft for the steering swing of the trailer, and the other end of the steering rocker arm is provided with a second connecting pin shaft for the heaving swing of the trailer; The steering rocker arm is rotatably connected to the drawbar via the first connecting pin, and is rotatably connected to the trailer via the second connecting pin; Alternatively, the steering rocker arm is rotatably connected to the trailer via the first connecting pin, and is rotatably connected to the drawbar via the second connecting pin.

[0007] In some embodiments of the present application, the trailer is provided with a limiting device at a position away from the wheels, and when the towing rod is flipped to the position where the trailer is away from the wheels, the limiting device can be detachably fixedly connected to the towing rod.

[0008] In some embodiments of the present application, the steering rocker arm is rotatably connected to the trailer via the first connecting pin, and the steering rocker arm is rotatably connected to the drawbar via the second connecting pin; The trailer connection structure also includes a third steering arm and a first steering tie rod rotatably connected to the third steering arm, the first steering tie rod is rotatably connected to the steering rocker arm, and the third steering arm is fixedly connected to the steering knuckle of the first axle.

[0009] In some embodiments of the present application, a second axle is also included, the steering knuckle of the second axle is fixedly connected to the second steering arm, and the steering knuckle of the first axle is also fixedly connected to the first steering arm; the first steering arm and the second steering arm have the same distribution direction, and the first steering arm and the second steering arm are respectively rotatably connected to the second steering tie rod.

[0010] In some embodiments of the present application, a first trapezoidal rod is further included, wherein two ends of the first trapezoidal rod are respectively connected to the steering knuckles at two ends of the first axle to maintain the steering Ackerman relationship of the first axle; And / or, the trailer connection structure further includes a second trapezoidal rod, both ends of which are respectively connected to the steering knuckles at both ends of the second axle to maintain the steering Ackerman relationship of the second axle.

[0011] In some embodiments of the present application, it also includes a trailer frame limit plate, a tractor left limit plate, and a tractor right limit plate; The trailer frame limit plate is fixedly connected to the chassis of the trailer, and the trailer frame limit plate is adjacent to the steering rocker arm and is used to limit the steering swing angle of the steering rocker arm.

[0012] In some embodiments of the present application, the traction limit rod is provided with a ball joint away from the traction rod for movably connecting with the tractor, and the tractor is provided with an articulation chamber corresponding to the ball joint. A left limit plate and a right limit plate of the tractor are provided in the articulation chamber for limiting the steering swing angle of the steering rocker arm.

[0013] In some embodiments of the present application, one end of the first shock-absorbing elastic member and the second shock-absorbing elastic member close to the limiting sleeve are both free ends; one end of the first shock-absorbing elastic member and the second shock-absorbing elastic member away from the limiting sleeve are both connected to the traction limiting rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The trailer connection structure provided by the present application allows a certain inclination angle difference between the trailer and the tractor through the rotational connection between the traction limit rod and the limit shaft sleeve. Even if the trailer rolls over, the tractor can be prevented from being dragged by the rotational connection relationship, thereby realizing the anti-rollover function; through the sliding connection between the traction limit rod and the limit shaft sleeve, there is distance redundancy when the trailer and the tractor are impacted, and the first shock-absorbing elastic member and the second shock-absorbing elastic member are used to buffer the impact, thereby reducing the probability of the tractor being damaged by the impact of the trailer or the trailer breaking the connection structure and detaching from the tractor; at the same time, the traction rod is used as a medium to allow rotation between the axles of the trailer to meet the turning requirements; in summary, the safety is improved without affecting the basic functions of trailer connection and steering, thereby ensuring the safety of the tractor and the trailer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic top view of the trailer connection structure provided in this embodiment, ignoring the tractor and part of the trailer; Figure 2 yes Figure 1 A semi-sectional schematic diagram of the buffer structure of the middle traction rod and the traction limit rod; Figure 3 yes Figure 1 Schematic diagram of the connection relationship between the middle steering rocker arm-traction rod-traction limit rod; Figure 4 is a schematic top view of the structure of the trailer connected to the tractor in this embodiment; Figure 5 is a front view of the drawbar storage in the trailer connection structure provided by this embodiment; Figure 6 yes Figure 1 A schematic diagram of the structure of the middle traction limit rod; In the figure: 1, second rear axle; 2, first rear axle; 3, second vehicle axle; 4, second steering arm; 5, second steering tie rod; 6, first steering arm; 7, steering rocker arm; 8, third steering arm; 9, first steering tie rod; 10, traction rod; 11, maintenance plate; 12, traction limit rod; 13, second connecting pin; 14.1, first shock-absorbing elastic member; 14.2, second shock-absorbing elastic member; 15, limit plate; 16, fixing pin; 17 , anti-slip part; 18, limit shaft sleeve; 20, trailer frame limit plate; 21, tractor left limit plate; 22, tractor; 23, tractor right limit plate; 24, trailer; 25, first connecting pin; 26, first axle; 27, first trapezoidal rod; 28, second trapezoidal rod; 29, U-bolt; 30, limit device; 31, widening section; 32, ball joint; 33, first connecting end; 34, bending portion; 35, second connecting end. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application / this application to clearly and completely describe the technical solutions in the embodiments of this application / this application. Obviously, the described embodiments are only part of the embodiments of this application / this application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the application / this application and its application or use. Embodiment 1

[0018] This embodiment provides a trailer connection structure to solve the problem of poor safety between a tractor and a trailer in the prior art.

[0019] refer to Figures 1 to 6 The trailer connection structure provided in this embodiment includes a towing rod 10, one end of which is rotatably connected to the axle of the trailer 24. When the tractor 22 turns, the towing rod 10 rotates relative to the trailer 24, and a limited position sleeve 18 is provided at the other end of the towing rod 10.

[0020] The trailer connection structure provided in this embodiment also includes a towing limit rod 12, wherein the towing limit rod 12 is inserted into a limit shaft sleeve 18 to achieve a sliding connection between the towing limit rod 12 and the towing rod 10, and the towing limit rod 12 can also rotate relative to the limit shaft sleeve 18.

[0021] The traction limit rod 12 is provided with an anti-slipping piece 17 at a certain distance from the limiting sleeve 18, and the interval is used to allow the traction limit rod 12 and the traction rod 10 to slide relative to each other; the traction rod 10 is sleeved with a first shock-absorbing elastic piece 14.1, and the first shock-absorbing elastic piece 14.1 is located between the anti-slipping piece 17 and the limiting sleeve 18. When the traction limit rod 12 and the traction rod 10 slide close to a certain distance or overlap each other to a certain extent, the first shock-absorbing elastic piece 14.1 begins to buffer the approaching effect between the traction limit rod 12 and the traction rod 10. At the same time, the anti-slipping piece 17 is used to prevent the first shock-absorbing elastic piece 14.1 from falling off from the traction limit rod 12 and prevent the traction limit rod 12 from falling off from the limiting sleeve 18.

[0022] In a similar principle, a widened section 31 is formed at one end of the traction limit rod 12 away from the traction rod 10, and the distance between the widened section 31 and the limiting sleeve 18 is used for relative sliding between the traction limit rod 12 and the traction rod 10 in opposite directions; the traction rod 10 is also sleeved with a second shock-absorbing elastic member 14.2, and the second shock-absorbing elastic member 14.2 is located between the widened section 31 and the limiting sleeve 18. When the traction limit rod 12 and the traction rod 10 slide away from each other to a certain distance or the overlapping part is reduced to a certain extent, the second shock-absorbing elastic member 14.2 begins to buffer the distance between the traction limit rod 12 and the traction rod 10. At the same time, the widened section 31 is used to prevent the first shock-absorbing elastic member 14.1 from coming off the traction limit rod 12, and to prevent the traction limit rod 12 from excessively penetrating the limiting sleeve 18.

[0023] The traction limit rod 12 is used to connect with the tractor 22. When the trailer connection structure provided in this embodiment is used, refer to Figure 2 The tractor 22 drags the traction limit rod 12, the traction limit rod 12 drives the anti-slip component 17, the anti-slip component 17 drives the traction rod 10 through the first shock-absorbing elastic component 14.1, and then the traction rod 10 pulls the trailer 24 forward.

[0024] Case 1: There is a bump on the road. The kinetic energy of the tractor 22 is offset after the wheels hit the bump. However, due to inertia, the speed of the trailer 24 is greater than that of the tractor 22, causing the trailer 24 to suddenly approach the tractor 22. Figure 2At this time, since the traction limit rod 12 is connected to the tractor 22, and the traction rod 10 is connected to the trailer 24, the traction rod 10 and the traction limit rod 12 are further overlapped. From the perspective of the traction limit rod 12, the limit sleeve 18 slides toward the tractor 22, that is, slides toward the widened section 31; the second shock-absorbing elastic member 14.2 is compressed and begins to buffer the sliding of the limit sleeve 18 toward the tractor 22. A large amount of kinetic energy is converted into the elastic potential energy of the second shock-absorbing elastic member 14.2, which greatly slows down the impact of the trailer 24 on the tractor 22, and secondly prevents the trailer connection structure from being damaged by the impact. When the tractor 22 passes through the protrusion, the elastic potential energy of the second shock-absorbing elastic member 14.2 is gradually released, the speed of the tractor 22 and the trailer 24 are basically the same, and the relative position of the limit sleeve 18 and the traction limit rod 12 is restored to the default.

[0025] Case 2: There is a bump on the road. The wheels of the tractor 22 have passed the bump, but the trailer 24 is hitting the bump. The speed of the trailer 24 is lower than that of the tractor 22, causing the trailer 24 to suddenly move away from the tractor 22. Figure 2 , the overlap between the traction rod 10 and the traction limit rod 12 is reduced. From the perspective of the traction limit rod 12, the limit sleeve 18 slides away from the tractor 22, that is, slides toward the anti-slip component 17; the first shock-absorbing elastic component 14.1 is compressed and begins to buffer the sliding of the limit sleeve 18 away from the tractor 22. A large amount of kinetic energy is converted into the elastic potential energy of the first shock-absorbing elastic component 14.1, which greatly slows down the impact of the trailer 24 trying to break away from the tractor 22, and secondly prevents the trailer connection structure from being damaged by tension. When the trailer 24 passes through the protrusion, the elastic potential energy of the first shock-absorbing elastic component 14.1 is gradually released, the speed of the tractor 22 and the trailer 24 are basically the same, and the relative position of the limit sleeve 18 and the traction limit rod 12 is restored to the default.

[0026] The situation of the pit is similar to that of two continuous protrusions and will not be described in detail here.

[0027] Case 3: There is an inclined plane on the road. When the tractor 22 passes the inclined plane, it swings up and down obliquely toward one side. The traction limit rod 12 and the limit shaft sleeve 18 rotate relative to each other, so the left and right inclination angle of the trailer 24 remains original. The tractor 22 passes the inclined plane, but when the trailer 24 passes the inclined plane, it swings up and down obliquely toward one side. The traction limit rod 12 and the limit shaft sleeve 18 rotate relative to each other, so the left and right inclination angle of the tractor 22 remains original.

[0028] The structural operation principles generated by the above-mentioned various situations are not unique and strictly corresponding. Those skilled in the art can understand them according to the actual situation. The internal structural mechanism of the trailer connection structure in other cases can be referred to in this article and will not be repeated here.

[0029] It is worth noting that the first shock-absorbing elastic member 14.1 and the second shock-absorbing elastic member 14.2 are preferably only sleeved on the traction limit rod 12, and only the end away from the limit sleeve 18 is fixed to the traction limit rod 12, and the end close to the limit sleeve 18 should be a free end; if the first shock-absorbing elastic member 14.1 and / or the second shock-absorbing elastic member 14.2 is fixed to the limit sleeve 18 at one end close to the limit sleeve 18, it will affect the mutual rotation between the limit sleeve 18 and the traction limit rod 12, thereby affecting the anti-rollover capability of the trailer connection structure. As one embodiment, one end of the first shock-absorbing elastic member 14.1 away from the limiting sleeve 18 is fixedly connected to the anti-slip member 17, and one end of the second shock-absorbing elastic member 14.2 away from the limiting sleeve 18 is fixedly connected to the widened section 31 to achieve connection with the traction limiting rod 12 to prevent the first shock-absorbing elastic member 14.1 and the second shock-absorbing elastic member 14.2 from sliding and shaking on the traction limiting rod 12; of course, refer to Figure 2 The ends of the first shock-absorbing elastic member 14 . 1 and the second shock-absorbing elastic member 14 . 2 that are away from the limiting sleeve 18 can be directly connected to the traction limiting rod 12 .

[0030] As one embodiment, the first shock-absorbing elastic member 14.1 and the second shock-absorbing elastic member 14.2 are springs. The springs have a long service life and high elastic potential energy. The springs can be selected as screw springs.

[0031] It is not difficult for a person skilled in the art to see that, as one embodiment, the design life of the first shock-absorbing elastic member 14.1 should be longer than or slightly longer than the second shock-absorbing elastic member 14.2.

[0032] The widened section 31 and the anti-slip component 17 are almost identical in function, so the widened section 31 can be an anti-slip component attached to the traction limit rod 12, and the anti-slip component 17 can also be a widened section on the original width of the traction limit rod 12. However, the widened section 31 may be exposed outside the traction rod 10, but the anti-slip component 17 is the opposite. Considering the convenience of installation, the anti-slip component 17 should be an independent component that can be detached from the traction limit rod 12.

[0033] As one example, refer to Figure 2 The traction rod 10 is tube-mounted, and the limiting shaft sleeve 18 is fixed on the traction rod 10 through the limiting plate 15 to promote force balance, and the traction limiting rod 12 is inserted into the traction rod 10.

[0034] The axle of the trailer 24 can be implemented in other forms known in the art, such as even more other known forms, which will not be described in detail here.

[0035] In most cases, vehicles will have accidents under harsh road conditions. Existing trailer connection structures rarely take into account the harsh road conditions that emergency vehicles may face, and thus cannot meet the safety requirements for rollover and impact prevention. In contrast, the trailer connection structure provided in the present embodiment allows a certain inclination difference between the trailer 24 and the tractor 22 through the rotational connection between the towing limit rod 12 and the limit shaft sleeve 18. Even if the trailer 24 rolls over, the rotational connection relationship can be used to prevent the tractor 22 from being involved, thereby realizing the anti-rollover function; through the sliding connection between the towing limit rod 12 and the limit shaft sleeve 18, there is distance redundancy between the trailer 24 and the tractor 22 when they are impacted, and the first shock-absorbing elastic member 14.1 and the second shock-absorbing elastic member 14.2 are used to buffer the impact, thereby reducing the probability that the tractor 22 is damaged by the impact of the trailer 24 or the trailer 24 breaks the connection structure and detaches from the tractor 22; at the same time, the towing rod 10 is used as a medium to allow rotation between the axles of the trailer 24 to meet the turning requirements; in summary, the safety is improved without affecting the basic functions of the connection and steering of the trailer 24, thereby ensuring the safety of the tractor 22 and the trailer 24. Embodiment 2

[0036] This embodiment provides a trailer connection structure. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to the first embodiment.

[0037] The traction rod 10 is a cylindrical object which is easily conceivable. This design allows the force of the limiting sleeve 18 to be more evenly transmitted to the wall of the traction rod 10 through the limiting plate 15; however, this also increases the difficulty of disassembling and assembling the traction limiting rod 12.

[0038] To overcome this problem, refer to Figure 2 In a further but non-limiting embodiment of the present application, the anti-slip member 17 is a slotted nut, and the anti-slip member 17 is detachably connected to the traction limit rod 12 through a thread, and the traction rod 10 is provided with a pin hole corresponding to the slotted position of the anti-slip member 17, and the fixing pin 16 is inserted into the slot of the anti-slip member 17 through the pin hole to fix the position of the anti-slip member 17 on the traction limit rod 12; at the same time, the traction rod 10 is provided with an openable and closable maintenance plate 11 at the position corresponding to the anti-slip member 17, During installation, the maintenance plate 11 is opened, the anti-slipping member 17 is screwed into the traction limit rod 12 to a suitable position, and the fixing pin 16 is inserted into the pin hole and the slot of the anti-slipping member 17, so that the anti-slipping member 17 cannot rotate, and then remains fixed to the traction limit rod 12, and the maintenance plate 11 is closed. Similarly, the disassembly process is not repeated here.

[0039] When driving on bad road conditions, in addition to the potential risks of rollover and impact, the height difference between the trailer 24 and the tractor 22 may easily cause damage to the connection structure. In a further but non-limiting embodiment of the present application, the trailer connection structure also includes a steering rocker arm 7, one end of the steering rocker arm 7 is provided with a first connecting pin 25 for steering and swinging of the trailer 24, and the other end is provided with a second connecting pin 13 for ups and downs swinging of the trailer 24; the steering rocker arm 7 is rotatably connected to the traction rod 10 through the first connecting pin 25, and is rotatably connected to the trailer 24 through the second connecting pin 13; or, the steering rocker arm 7 is rotatably connected to the trailer 24 through the first connecting pin 25, and is rotatably connected to the traction rod 10 through the second connecting pin 13.

[0040] When the trailer 24 and the tractor 22 pass over bumps or pits on the road, the steering rocker arm 7 and the trailer 24 rotate up and down around the second connecting pin 13, or the steering rocker arm 7 and the traction rod 10 rotate up and down around the second connecting pin 13, so as to adapt to the bumps or pits on the road and prevent stress and bending on the trailer connection structure.

[0041] The second connecting pin 13, which was originally used to adapt to the bumps or pits on the road surface and prevent stress and bending on the trailer connection structure, can also be used for portable storage of the trailer connection structure. Figure 5 As one embodiment, the trailer 24 is provided with a limiting device 30 at a position away from the wheels. When the traction rod 10 is flipped to a position away from the wheels, the limiting device 30 can ("can" indicates the ability of the limiting device 30 rather than the probability) be detachably fixedly connected to the traction rod 10. When the trailer 24 is idle, the traction rod 10 or the traction rod 10 and the steering rocker arm 7 are folded upward, the traction rod 10 can be folded 90°, and then fixed by the limiting device 30. When the trailer 24 is in use, the limiting device 30 is released.

[0042] The limiting device 30 can be implemented in other forms known in the art. For example, the limiting device 30 can be made into pin holes respectively arranged on the trailer 24 and the towing rod 10, and the towing rod 10 can be fixed with pins, or the limiting device 30 can be made into a fastener that matches the outer wall of the towing rod 10, or even more other known forms, which will not be repeated here.

[0043] The trailer connection structure provided in this embodiment also improves the steering structure of the trailer 24 to achieve the purpose of 1. reducing the turning radius and 2. being compatible with all the safety functions mentioned above. Figure 1 The trailer connection structure also includes a third steering arm 8 and a first steering tie rod 9 rotatably connected to the third steering arm 8, the first steering tie rod 9 is rotatably connected to the steering rocker arm 7, and the third steering arm 8 is fixedly connected to the steering knuckle of the first axle 26. In order to ensure that the auxiliary steering function of the third steering arm 8 and the first steering tie rod 9 is normally performed, refer to Figure 3, the steering rocker arm 7 is rotatably connected to the trailer 24 through the first connecting pin 25, and the steering rocker arm 7 is rotatably connected to the traction rod 10 through the second connecting pin 13. When the front tractor 22 is turning, the steering rocker arm 7 turns relative to the chassis of the trailer 24 through the first connecting pin 25, and at the same time, the steering rocker arm 7 drives the third steering arm 8 and the first steering tie rod 9 to rotate. According to the physical properties of the four-link system composed of the third steering arm 8, the first steering tie rod 9, the steering rocker arm 7 and the chassis of the trailer 24, the third steering arm 8 and the steering knuckle of the first axle 26 rotate synchronously with the steering rocker arm 7, and then cooperate with the turning action of the front tractor 22; in this way, the turning radius of the tractor 22-trailer 24 system can be reduced by the synchronous steering of the first axle 26 and its wheels, and at the same time, it will not affect the normal safety operation of the components on which all the safety functions mentioned above rely. Generally speaking, the first axle 26 is the first front axle of the trailer 24.

[0044] In order to consolidate the above-mentioned effect of reducing the turning radius, the trailer connection structure also includes a second axle 3, the steering knuckle of the second axle 3 is fixedly connected to the second steering arm 4, and the steering knuckle of the first axle 26 is also fixedly connected to the first steering arm 6; the first steering arm 6 and the second steering arm 4 have the same distribution direction, and the first steering arm 6 and the second steering arm 4 are respectively rotatably connected to the second steering rod 5.

[0045] refer to Figure 1 When the steering knuckle of the first axle 26 rotates, the steering knuckle of the second axle 3 rotates synchronously with the steering knuckle of the first axle 26 through the transmission effect of the trapezoidal rod system composed of the second steering arm 4-the second steering tie rod 5-the first steering arm 6, and then cooperates with the turning action of the front tractor 22 to reduce the turning radius of the tractor 22-trailer 24 system. Generally speaking, the second axle 3 is the second axle of the trailer 24. If the trailer 24 has multiple axles, such as Figure 1 The trailer 24 shown also includes a first rear axle 2 and a second rear axle 1. The same technical solution can be used to make the steering knuckle of the subsequent axle cooperate with the turning action of the front tractor 22 to reduce the turning radius of the tractor 22-trailer 24 system, which will not be repeated here. The tractor 22-trailer 24 system effectively turns left and right in a narrow aisle, achieves the maximum tire turning angle, and ensures that the pull rods and steering rocker arms 7 do not interfere with the frame and tires.

[0046] In addition, compared with the steering axle scheme under the existing technical scheme, a large cross-axle traction rod arranged in the middle and a hinge plate rotatably connected to the large cross-axle traction rod are mostly used to coordinate the rotation between the axles. Undoubtedly, the steering axle system composed of the trapezoidal rod system composed of the second steering arm 4-the second steering rod 5-the first steering arm 6 in this embodiment only exists between adjacent axles, which can reduce the occupation of the chassis space of the trailer 24, especially reduce the occupation of the middle space of the chassis of the trailer 24.

[0047] In order to improve the handling and stability of each axle on the trailer 24 chassis, refer to Figure 1 The trailer connection structure further includes a first trapezoidal rod 27, the two ends of which are respectively connected to the steering knuckles at the two ends of the first axle 26 to maintain the steering Ackerman relationship of the first axle 26; similarly, the trailer connection structure further includes a second trapezoidal rod 28, the two ends of which are respectively connected to the steering knuckles at the two ends of the second axle 3 to maintain the steering Ackerman relationship of the second axle 3. The Ackerman relationship, also known as the Ackerman angle, is a geometric relationship used to ensure that the turning radius of the inner and outer tires of the trailer 24 is appropriate when turning, so that the trailer 24-tractor 22 system is more stable and efficient when turning.

[0048] This type of Ackerman relationship can be extended to other axles with steering functions and will not be described in detail here.

[0049] In order to facilitate the stable connection of the axle, refer to Figure 1 The trailer connection structure further includes a plurality of U-bolts 29, the axle of the trailer 24 is located inside the U-bolts 29, and both ends of the U-bolts 29 are connected to the trailer 24 to fix the axle to the chassis of the trailer 24. The second rear axle 1, the first rear axle 2, the second axle 3 and the first axle 26 are also fixed to the chassis of the trailer 24 by the same principle.

[0050] In order to make the steering rocker arm 7, the traction rod 10 and the traction limit rod 12 fully function, prevent the connection point between the steering rocker arm 7 and the chassis of the trailer 24 from being damaged, and prevent the connection point between the traction limit rod 12 and the tractor 22 from being damaged, in a further but non-limiting embodiment of the present application, reference is made to Figure 4 and Figure 2 The trailer connection structure also includes a trailer frame limit plate 20, a tractor left limit plate 21 and a tractor right limit plate 23; the trailer frame limit plate 20 is fixedly connected to the chassis of the trailer 24, and the trailer frame limit plate 20 is adjacent to the steering rocker arm 7, which is used to limit the steering swing angle of the steering rocker arm 7; refer to Figure 4The traction limit rod 12 is provided with a ball joint 32 for active connection with the tractor 22 away from the traction rod 10, and the tractor 22 is provided with an articulation chamber corresponding to the ball joint 32, and the tractor left limit plate 21 and the tractor right limit plate 23 are provided in the articulation chamber to limit the steering swing angle of the steering rocker arm 7. As one embodiment, the rotation angle range of the ball joint 32 is limited to ±13°.

[0051] refer to Figure 5 and Figure 6 The traction limit rod 12 includes a first connecting end 33 and a second connecting end 35. The first connecting end 33 and the second connecting end 35 are transitioned through a bending portion 34. The first connecting end 33 is used to connect the ball joint 32, and the second connecting end 35 is used to connect to the steering rocker arm 7. The existence of the bending portion 34 allows the ball joint 32 to be inserted into the hinge chamber from top to bottom to prevent the ball joint 32 from falling out.

[0052] In summary, the trailer connection structure provided in this embodiment, compared with the first embodiment, mainly adds structures such as the steering rocker arm 7 to reduce the negative impact of the ups and downs rotation, introduces a storage solution for the traction rod 10, and provides a steering axle structure design that is compatible with the original safety structure. The design also has the advantages of small space occupation and small turning radius.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided at", "provided with", "located", "installed", "set", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. "Hinged" includes "rotational connection".

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A trailer connection structure, characterized in that: include, A traction rod (10), one end of which is rotatably connected to the axle of the trailer (24), and the other end of which is provided with a limited position shaft sleeve (18); The traction limit rod (12) is sleeved into the limit shaft sleeve (18) and is rotatably and slidably connected to the limit shaft sleeve (18); the traction limit rod (12) is provided with an anti-slipping piece (17) at a certain distance from the limit shaft sleeve (18); the traction rod (10) is sleeved with a first shock-absorbing elastic piece (14.1), and the first shock-absorbing elastic piece (14.1) is located between the anti-slipping piece (17) and the limit shaft sleeve (18); the traction limit rod (12) forms a widened section (31) at one end away from the traction rod (10), and the traction rod (10) is further sleeved with a second shock-absorbing elastic piece (14.2), and the second shock-absorbing elastic piece (14.2) is located between the widened section (31) and the limit shaft sleeve (18); One end of the traction limit rod (12) close to the widened section (31) is used for connecting to the traction vehicle (22).

2. The trailer connection structure according to claim 1, characterized in that: The traction rod (10) is a cylindrical object, and the traction rod (10) is fixedly connected to the limiting shaft sleeve (18) via a limiting plate (15); The anti-slip member (17) is a slotted nut, the anti-slip member (17) is detachably connected to the traction limit rod (12) via a thread, the traction rod (10) is provided with a pin hole corresponding to the slotted position of the anti-slip member (17), and a fixing pin (16) is inserted into the slot of the anti-slip member (17) through the pin hole to fix the position of the anti-slip member (17) on the traction limit rod (12); The traction rod (10) is provided with an openable and closable maintenance panel (11) at a position corresponding to the anti-slip component (17).

3. The trailer connection structure according to claim 1, characterized in that: It also comprises a steering rocker arm (7), one end of the steering rocker arm (7) being provided with a first connecting pin shaft (25) for the steering and swinging of the trailer (24), and the other end of the steering rocker arm (7) being provided with a second connecting pin shaft (13) for the ups and downs swinging of the trailer (24); The steering rocker arm (7) is rotatably connected to the traction rod (10) via the first connecting pin (25), and is rotatably connected to the trailer (24) via the second connecting pin (13); Alternatively, the steering rocker arm (7) is rotationally connected to the trailer (24) via the first connecting pin (25), and is rotationally connected to the traction rod (10) via the second connecting pin (13).

4. The trailer connection structure according to claim 3, characterized in that: The trailer (24) is provided with a limiting device (30) at a position away from the wheels; when the traction rod (10) is flipped to a position where the trailer (24) is away from the wheels, the limiting device (30) can be detachably fixedly connected to the traction rod (10).

5. The trailer connection structure according to claim 3, characterized in that: The steering rocker arm (7) is rotatably connected to the trailer (24) via the first connecting pin (25), and the steering rocker arm (7) is rotatably connected to the drawbar (10) via the second connecting pin (13); The trailer connection structure further comprises a third steering arm (8) and a first steering tie rod (9) rotatably connected to the third steering arm (8), the first steering tie rod (9) being rotatably connected to the steering rocker arm (7), and the third steering arm (8) being fixedly connected to a steering knuckle of a first axle (26).

6. The trailer connection structure according to claim 5, characterized in that: It also comprises a second axle (3), the steering knuckle of the second axle (3) being fixedly connected to the second steering arm (4), and the steering knuckle of the first axle (26) being fixedly connected to the first steering arm (6); the first steering arm (6) and the second steering arm (4) are arranged in the same direction, and the first steering arm (6) and the second steering arm (4) are respectively rotatably connected to the second steering tie rod (5).

7. The trailer connection structure according to claim 6, characterized in that: It also includes a first trapezoidal rod (27), wherein two ends of the first trapezoidal rod (27) are respectively connected to the steering knuckles at two ends of the first axle (26) to maintain the steering Ackerman relationship of the first axle (26); And / or, the trailer connection structure further comprises a second trapezoidal rod (28), the two ends of the second trapezoidal rod (28) being respectively connected to the steering knuckles at the two ends of the second axle (3) to maintain the steering Ackerman relationship of the second axle (3).

8. The trailer connection structure according to claim 3, characterized in that: It also includes a trailer frame limit plate (20), a tractor left limit plate (21) and a tractor right limit plate (23); The trailer frame limit plate (20) is fixedly connected to the chassis of the trailer (24); the trailer frame limit plate (20) is located adjacent to the steering rocker arm (7) and is used to limit the steering swing angle of the steering rocker arm (7).

9. The trailer connection structure according to claim 1, characterized in that: The traction limit rod (12) is provided with a ball joint (32) away from the traction rod (10) for being movably connected to the tractor (22); the tractor (22) is provided with an articulation chamber corresponding to the ball joint (32); a tractor left limit plate (21) and a tractor right limit plate (23) are provided in the articulation chamber for limiting the steering swing angle of the steering rocker arm (7).

10. The trailer connection structure according to any one of claims 1 to 9, characterized in that: One end of the first shock-absorbing elastic member (14.1) and the second shock-absorbing elastic member (14.2) close to the limiting shaft sleeve (18) are both free ends; and one end of the first shock-absorbing elastic member (14.1) and the second shock-absorbing elastic member (14.2) facing away from the limiting shaft sleeve (18) are both connected to the traction limiting rod (12).

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