Frame structure for trailer

Abstract

The utility model provides a frame structure for a trailer, which belongs to the technical field of trailers and comprises two longitudinal beams arranged in parallel, the front ends and the rear ends of the two longitudinal beams are fixedly connected through connecting beams, a plurality of cross beams are further fixedly connected between the two longitudinal beams, and the two longitudinal beams, the two connecting beams and the cross beams form a vehicle body frame. Two axles are arranged below the vehicle body frame in parallel, and the two sides of the vehicle body frame are connected with the two axles through damping mechanisms. The damping mechanism comprises two plate springs and two dampers, the two plate springs are fixedly connected with the two axles respectively, the two ends of each plate spring are fixedly connected with the longitudinal beam through lifting lugs, the two dampers are symmetrically arranged between the two axles, the top ends of the two dampers are riveted to the longitudinal beam through damper supports, and the two dampers are fixedly connected with the longitudinal beam through lifting lugs. The bottom ends of the two shock absorbers are hinged to plate spring pressing plates fixed to the bottoms of the two plate springs respectively. The filtering effect of the frame structure on road bumpiness can be improved, and the bumpiness feeling of the trailer in the no-load or light-load state is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to trailer technical field, especially relate to a trailer car frame structure. BACKGROUND

[0002] The trailer is fixed behind the towing vehicle and is moved by the towing vehicle, since the trailer and the towing vehicle are connected through the towing device, the trailer is not directly fixed on the frame of the towing vehicle, and the vibration amplitude of the trailer is generally greater than that of the towing vehicle during driving.

[0003] The existing trailer connects the axle and the body beam through the leaf spring and the shock absorber, and the leaf spring and the shock absorber are connected with the axle to absorb and dissipate the impact and vibration from the road, thereby protecting the stability and safety of the trailer itself, the loaded goods and the towing vehicle.

[0004] This kind of car frame structure is poor in filtering the fine bump of the road, especially when driving in an empty or light load state, which causes the trailer itself and the towing vehicle to have a significant bump feeling. INVENTION CONTENTS

[0005] In view of the defects or deficiencies in the prior art, the utility model provides a trailer car frame structure which can improve the filtering effect of the car frame structure on the road bump and reduce the bump feeling of the trailer in an empty or light load state.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The embodiment of the utility model provides a trailer car frame structure, which comprises two longitudinal beams arranged in parallel, the front end and the rear end of the two longitudinal beams are fixedly connected through connecting beams, a plurality of cross beams are also fixedly connected between the two longitudinal beams, the two longitudinal beams, the two connecting beams and the plurality of cross beams form a body frame, two axles are arranged in parallel below the body frame, and the body frame is connected with the two axles through damping mechanisms on both sides.

[0008] The damping mechanism comprises a leaf spring and a shock absorber, and the leaf spring and the shock absorber are both provided with two, wherein the two leaf springs are fixedly connected with the two axles, the two ends of the leaf spring are fixedly connected with the longitudinal beam through the lifting lug, the two shock absorbers are symmetrically arranged between the two axles, the top end of the two shock absorbers is riveted with the longitudinal beam through a shock absorber support, and the bottom end of the two shock absorbers is hingedly connected with a leaf spring pressing plate fixed at the bottom of the two leaf springs.

[0009] Further, the axle is located on the upper surface of the leaf spring, U-shaped bolts are arranged on both sides of the leaf spring, the U-shaped bolts are sleeved on the axle, the bottom end of the U-shaped bolt passes through the bolt hole on the leaf spring pressing plate and is fixed through a nut.

[0010] Further, the plate spring is connected with the longitudinal beams through the hangers at both ends, three hangers are arranged on each longitudinal beam, the interval between the adjacent two hangers is same, and the axle is located below the adjacent two hangers, and the plate spring is hinged with the hangers at both ends.

[0011] Further, the hangers between the two axles are hinged with the connecting blocks at the bottom, the longitudinal section of the connecting block is triangular, the connecting block is hinged with the connecting rods at both ends, and the plate spring is hinged with the connecting rod at the end close to the connecting block.

[0012] Further, the damper support comprises a Z-shaped frame and a pad plate, one end of the Z-shaped frame is fixedly connected with the pad plate, the Z-shaped frame comprises a first ear plate, a second ear plate and a connecting plate, the first ear plate and the second ear plate are arranged at both ends of the connecting plate respectively, and the first ear plate and the second ear plate are arranged in parallel.

[0013] Further, the bottom surface of the first ear plate is welded and fixed on one side of the upper surface of the pad plate, the first mounting hole is formed in the first ear plate, the second mounting hole is formed in the pad plate at the position corresponding to the first mounting hole, the hole diameter of the first mounting hole is same as that of the second mounting hole, and the first mounting hole and the second mounting hole are arranged correspondingly.

[0014] Further, the first connecting hole is formed in the second ear plate, the sleeve mounting hole is formed in the upper surface of the pad plate away from the second mounting hole, the sleeve is arranged in the sleeve mounting hole, the second connecting hole is formed in the sleeve along the axis of the sleeve, the hole diameter of the second connecting hole is same as that of the first connecting hole, and the second connecting hole and the first connecting hole are arranged correspondingly.

[0015] Further, the ear hole is arranged on the end of the plate spring pressing plate close to the damper, the elastic bushing is sleeved in the ear hole, and the ear hole and the elastic bushing are in interference fit.

[0016] Further, the connecting hole at the bottom end of the damper is connected with the elastic bushing through the pin shaft.

[0017] Further, the pin shaft is in a stepped cylindrical structure, the middle part is provided with an annular boss, the two sides of the annular boss are respectively a damper mounting section and a bushing mounting section, the damper mounting section is matched with the connecting hole at the bottom end of the damper, and the bushing mounting section is matched with the bushing hole on the elastic bushing.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1. This utility model fixes the leaf spring to the axle, with both ends of the leaf spring connected to the longitudinal beam via lugs. The top of the shock absorber is riveted to the longitudinal beam via a shock absorber bracket, and the bottom of the shock absorber is hinged to the leaf spring pressure plate fixed to the bottom of the leaf spring. When the trailer experiences bumps, most of the vibration energy is first absorbed by the leaf spring, while the remaining vibration energy is transmitted to the shock absorber through the leaf spring pressure plate. The shock absorber then converts the kinetic energy of the spring into heat energy for dissipation. The leaf spring and the shock absorber work together to improve the filtering effect of the frame structure on road bumps and reduce the bumpy feeling of the trailer when it is unloaded or lightly loaded.

[0020] 2. This utility model rivets the shock absorber bracket to the longitudinal beam of the vehicle frame, avoiding the impact of welding thermal deformation on installation accuracy. At the same time, it rivets the shock absorber body to the shock absorber bracket. The mechanical connection of the riveting is of high strength and is not easy to loosen under long-term vibration, which significantly improves the reliability of the connection.

[0021] 3. The Z-shaped structure on the vibration damper bracket of this utility model optimizes load transmission. Combined with the buffering and friction reduction effect of the pressure plate and bushing, it makes the vibration damping system more stable during operation and effectively improves vibration damping performance.

[0022] 4. By setting an elastic bushing, the load of the shock absorber body is buffered by the elastic bushing and then evenly transmitted to the leaf spring, and then distributed to the hanger by the leaf spring. This avoids the load directly impacting the hanger, prevents the welded joint of the hanger from cracking or the leaf spring from being crushed locally, and improves the failure resistance of the suspension structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the trailer frame structure in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the vibration damping mechanism in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the shock absorber bracket structure in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the pin structure in an embodiment of the present utility model;

[0027] Among them, 1. Longitudinal beam; 2. Cross beam; 3. Axle; 4. Leaf spring; 5. Leaf spring pressure plate; 501. Elastic bushing; 6. U-bolt; 7. Lifting lug; 8. Connecting block; 9. Connecting rod; 10. Vibration damper; 11. Vibration damper bracket; 110. Z-shaped frame; 111. Pad; 112. Sleeve; 113. First ear plate; 114. Second ear plate; 115. Connecting plate; 116. First mounting hole; 117. First connecting hole; 118. Second connecting hole; 12. Pin; 120. Annular boss; 121. Vibration damper mounting section; 122. Bushing mounting section. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] A typical embodiment of this utility model is as follows: Figure 1 As shown, a trailer frame structure includes two parallel longitudinal beams 1, with the front and rear ends of the two longitudinal beams 1 fixedly connected by connecting beams to form a rectangular frame structure. Multiple crossbeams 2 are also fixedly connected between the two longitudinal beams 1 to ensure the strength of the frame structure. The two longitudinal beams 1, the two connecting beams, and the multiple crossbeams 2 form the vehicle body frame. An axle 3 is provided under the vehicle body frame. The vehicle body frame is connected to the axle 3 through a vibration damping mechanism, thereby using the vibration damping mechanism to support the vehicle body frame and provide vibration damping function during movement to ensure the stability of the vehicle body when moving. A tow bracket (not shown in the figure) is fixed to the front end of the vehicle body frame, which can be connected to a towing vehicle to drive the trailer.

[0030] In this embodiment, there are two axles 3, both of which are perpendicular to the longitudinal beam 1 and are spaced apart by a set distance. The vibration damping mechanism is connected to the two axles 3 respectively. On the one hand, it increases the contact area with the ground, and on the other hand, the vibration damping mechanism can realize independent vibration damping of the two axles 3, ensuring the stability of the trailer during movement.

[0031] like Figure 2 As shown, the vibration damping mechanism includes leaf springs 4. There are four leaf springs 4, which are symmetrically fixed at both ends of the two axles 3 and located directly below the longitudinal beam 1. Specifically, the axles 3 are placed on the upper surface of the leaf springs 4, and leaf spring pressure plates 5 are provided on the lower surface of the leaf springs 4. U-bolts 6 are provided on both sides of the leaf springs 4. The U-bolts 6 are sleeved on the axles 3. The bottom end of the U-bolts 6 passes through the bolt holes on the leaf spring pressure plates 5 and is fixed by nuts, thereby fixing the leaf springs 4 to the axles 3.

[0032] The leaf spring 4 is connected to the longitudinal beam 1 at both ends by the lugs 7. Specifically, each longitudinal beam 1 is provided with three lugs 7, and the distance between two adjacent lugs 7 is the same. The axle 3 is located below the two adjacent lugs 7, and the two ends of the leaf spring 4 are respectively hinged to the lugs 7.

[0033] Furthermore, the lug 7 located between the two axles 3 is hinged to the leaf springs 4 on both sides. Specifically, a connecting block 8 is hinged to the bottom of the lug 7 located between the two axles 3. The longitudinal section of the connecting block 8 is triangular. Connecting rods 9 are hinged to both ends of the connecting block 8. The ends of the two leaf springs 4 near the connecting block 8 are hinged to the connecting rods 9.

[0034] By setting up connecting block 8 and connecting rod 9, and using connecting block 8 and connecting rod 9 to hinge with two leaf springs 4 respectively, independent vibration reduction of the two axles 3 of the trailer during the movement can be achieved, thereby ensuring the stability of the trailer during the movement.

[0035] The vibration damping mechanism also includes two vibration dampers 10, which are symmetrically arranged between the two axles 3. The top of the vibration damper 10 is connected to the longitudinal beam 1, and the bottom of the vibration damper 10 is connected to the leaf spring pressure plate 5. The vibration damper 10 adopts a bidirectional damping hydraulic vibration damper, which can actively absorb the vibration energy on bumpy roads, further enhance the vibration damping performance of the vibration damping mechanism, and ensure the stability of the trailer during movement.

[0036] Specifically, the top of the damper 10 is connected to the longitudinal beam 1 via the damper bracket 11. The end of the leaf spring pressure plate 5 is provided with an ear hole, and an elastic bushing 501 is fitted inside the ear hole. The bottom of the damper 10 is hinged to the elastic bushing 501 via a pin 12. The damper bracket 11 optimizes the load transmission. Combined with the buffering and friction reduction effect of the leaf spring pressure plate 5 and the elastic bushing 501, the damping system is more stable during operation, effectively improving the damping performance.

[0037] like Figure 3 As shown, the shock absorber bracket 11 includes a Z-shaped frame 110, a pad 111, and a sleeve 112. One end of the Z-shaped frame 110 is fixedly connected to the pad 111. The Z-shaped frame 110 includes a first ear plate 113, a second ear plate 114, and a connecting plate 115. The first ear plate 113 and the second ear plate 114 are located at both ends of the connecting plate 115, and the first ear plate 113 and the second ear plate 114 are arranged in parallel, so that the first ear plate 113, the connecting plate 115, and the second ear plate 114 form a Z-shape.

[0038] The bottom surface of the first ear plate 113 is welded and fixed to one side of the upper surface of the pad 111. The first ear plate 113 has a first mounting hole 116. The pad 111 has a second mounting hole at the corresponding position of the first mounting hole 116. The first mounting hole 116 and the second mounting hole have the same diameter and are correspondingly positioned. The first ear plate 113 has a first connecting hole 117. The upper surface of the pad 111 away from the second mounting hole has a sleeve mounting hole. A sleeve 112 is installed in the sleeve mounting hole. A second connecting hole 118 is opened at the axis of the sleeve 112. The second connecting hole 118 has the same diameter as the first connecting hole 117 and is correspondingly positioned.

[0039] Rivets pass through the first mounting hole 116 and the second mounting hole in sequence and are riveted to the pre-set mounting holes on the longitudinal beam 1, thereby fixing the shock absorber bracket 11 to the longitudinal beam 1. The top of the shock absorber 10 is placed between the second ear plate 114 and the pad plate 111, and the two sides of the connecting hole at the top of the shock absorber 10 are respectively set to correspond to the first connecting hole 117 and the second connecting hole 118. The shock absorber 10 is inclined at a 5°-10° angle to the vertical line. By using rivets to pass through the first connecting hole 117, the connecting hole at the top of the shock absorber 10 and the second connecting hole 118 in sequence, the top of the shock absorber 10 is riveted to the shock absorber bracket 11, realizing the hinge connection between the shock absorber 10 and the shock absorber bracket 11.

[0040] The Z-shaped structure on the vibration damper bracket 11 optimizes the force transmission path and effectively disperses the load borne by the vibration damper 10. Furthermore, the vibration damper bracket 11 is riveted to the longitudinal beam 1, avoiding the impact of welding thermal deformation on accuracy. At the same time, the vibration damper 10 is riveted to the vibration damper bracket 11, and the riveted mechanical connection has high strength and is not easy to loosen under long-term vibration, which significantly improves the reliability of the connection.

[0041] The bottom ends of the two shock absorbers 10 are respectively hinged to the two leaf spring pressure plates 5. The leaf spring pressure plate 5 has an ear hole near the end of the shock absorber 10. An elastic bushing 501 is fitted inside the ear hole. The end face of the ear hole is flush with the end face of the elastic bushing 501, and there is an interference fit between the ear hole and the elastic bushing 501. The outer surface of the elastic bushing 501 is provided with an annular protrusion, and the inner surface of the ear hole of the leaf spring pressure plate 5 is provided with an annular groove. During installation, the annular protrusion of the elastic bushing 501 is embedded in the annular groove of the ear hole of the leaf spring pressure plate 5 to ensure that the elastic bushing 501 is installed in place. The connecting hole at the bottom of the shock absorber 10 is connected to the elastic bushing 501 by a pin 12.

[0042] After the load of the leaf spring 4 is buffered by the elastic bushing 501, part of it will be transferred to the vibration damper 10, so as to avoid the load directly impacting the lifting lug 7, prevent the welding point of the lifting lug 7 from cracking or the leaf spring 4 from being crushed locally, and improve the failure resistance of the vibration damping mechanism.

[0043] like Figure 4 As shown, the pin 12 is a stepped cylindrical structure with an annular boss 120 in the middle. The two sides of the annular boss 120 are a damper mounting section 121 and a bushing mounting section 122, respectively. The diameters of the damper mounting section 121 and the bushing mounting section 122 are both smaller than the diameter of the annular boss 120. Setting the pin 12 in a stepped shape facilitates assembly and positioning.

[0044] The damper mounting section 121 is adapted to the bottom connection hole of the damper 10, and the damper mounting section 121 can be inserted into the bottom connection hole of the damper 10. The bushing mounting section 122 is adapted to the bushing hole on the elastic bushing 501, and the bushing mounting section 122 can be inserted into the bushing hole. Both ends of the pin 12 are provided with external threads, and the bottom end of the damper 10 and the elastic bushing 501 can be fixed on the pin 12 by nuts, thereby realizing the hinge between the damper 10 and the leaf spring pressure plate 5.

[0045] The bottom end of the damper 10 is hinged to the leaf spring pressure plate 5, thereby achieving the cooperation with the leaf spring 4 and improving the damping performance of the damping mechanism. It is connected to the damper 10 through the elastic bushing 501 and then fixed with the pin 12, which can reduce vibration wear and enhance the buffering performance.

[0046] The pin 12, leaf spring pressure plate 5, elastic bushing 501 and shock absorber 10 work together to form a stepped buffer structure, which can attenuate more than 80% of high-frequency vibrations and ensure the stability of the trailer during movement.

[0047] By fixing the leaf spring 4 to the axle 3, the two ends of the leaf spring 4 are connected to the longitudinal beam 1 through the lugs 7. The top of the shock absorber 10 is riveted to the longitudinal beam 1 through the shock absorber bracket 11, and the bottom of the shock absorber 10 is hinged to the leaf spring pressure plate 5 fixed at the bottom of the leaf spring 4. When the trailer bumps, most of the vibration energy is absorbed by the leaf spring 4 first, and the remaining vibration energy is transmitted to the shock absorber 10 through the leaf spring pressure plate 5. The shock absorber 10 converts the kinetic energy of the leaf spring 4 into heat energy and dissipates it. The leaf spring 4 and the shock absorber 10 work together to improve the filtering effect of the frame structure on road bumps and reduce the bumpy feeling of the trailer when it is unloaded or lightly loaded.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A trailer frame structure, characterized in that, It includes two parallel longitudinal beams, with the front and rear ends of the two longitudinal beams fixedly connected by connecting beams. Multiple cross beams are also fixedly connected between the two longitudinal beams. The two longitudinal beams, the two connecting beams, and the multiple cross beams form the vehicle frame. Two parallel axles are set under the vehicle frame. The two sides of the vehicle frame are connected to the two axles through a vibration damping mechanism. The vibration damping mechanism includes leaf springs and vibration dampers, with two leaf springs and two vibration dampers. The two leaf springs are fixedly connected to the two axles respectively, and the two ends of the leaf springs are fixedly connected to the longitudinal beam through lugs. The two vibration dampers are symmetrically arranged between the two axles. The top of the two vibration dampers is riveted to the longitudinal beam through vibration damper brackets, and the bottom of the two vibration dampers is hinged to the leaf spring pressure plates fixed to the bottom of the two leaf springs respectively.

2. The trailer frame structure as described in claim 1, characterized in that, The axle is located on the upper surface of the leaf spring. U-bolts are provided on both sides of the leaf spring. The U-bolts are sleeved on the axle. The bottom end of the U-bolt passes through the bolt hole on the leaf spring pressure plate and is fixed by a nut.

3. A trailer frame structure as described in claim 2, characterized in that, The leaf spring is connected to the longitudinal beam at both ends by lugs. Each longitudinal beam is provided with three lugs. The distance between two adjacent lugs is the same. The axle is located below the two adjacent lugs. The two ends of the leaf spring are respectively hinged to the lugs.

4. A trailer frame structure as described in claim 3, characterized in that, A connecting block is hinged to the bottom of the lug located between the two axles. The longitudinal section of the connecting block is triangular. Connecting rods are hinged to both ends of the connecting block. The ends of the two leaf springs closest to the connecting block are hinged to the connecting rods.

5. A trailer frame structure as described in claim 1, characterized in that, The shock absorber bracket includes a Z-shaped frame and a pad. One end of the Z-shaped frame is fixedly connected to the pad. The Z-shaped frame includes a first ear plate, a second ear plate, and a connecting plate. The first ear plate and the second ear plate are located at both ends of the connecting plate, and the first ear plate and the second ear plate are arranged in parallel.

6. A trailer frame structure as described in claim 5, characterized in that, The bottom surface of the first ear plate is welded and fixed to one side of the upper surface of the pad plate. The first ear plate has a first mounting hole, and the pad plate has a second mounting hole at the corresponding position of the first mounting hole. The first mounting hole and the second mounting hole have the same diameter and are set accordingly.

7. A trailer frame structure as described in claim 6, characterized in that, The second ear plate has a first connecting hole, and the upper surface of the pad plate away from the second mounting hole has a sleeve mounting hole. A sleeve is installed in the sleeve mounting hole, and a second connecting hole is provided at the axis of the sleeve. The second connecting hole and the first connecting hole have the same diameter and are correspondingly set.

8. A trailer frame structure as described in claim 1, characterized in that, The leaf spring pressure plate has an ear hole at one end near the shock absorber, and an elastic bushing is fitted inside the ear hole, with an interference fit between the ear hole and the elastic bushing.

9. A trailer frame structure as described in claim 8, characterized in that, The connection hole at the bottom of the shock absorber is connected to the elastic bushing by a pin.

10. A trailer frame structure as described in claim 9, characterized in that, The pin is a stepped cylindrical structure with an annular boss in the middle. The two sides of the annular boss are a damper mounting section and a bushing mounting section, respectively. The damper mounting section is adapted to the connection hole at the bottom of the damper, and the bushing mounting section is adapted to the bushing hole on the elastic bushing.

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