A front lower guard assembly and a tractor

Abstract

The application relates to the technical field of trailer accessories, in particular to a front lower protection assembly and a trailer. The front lower protection assembly comprises a cross beam and two bracket units; the cross beam comprises a straight beam, the straight beam is arranged in extension along the width direction of the vehicle, and the cross section of the straight beam is a'sun' type structure; the two bracket units are symmetrically arranged left and right with the center of the extension direction of the straight beam as a reference, each bracket unit comprises a mounting bracket and a connecting bracket; the mounting bracket comprises two mounting plates arranged at intervals, and the two mounting plates are fixedly connected with the straight beam; the connecting bracket comprises two connecting plates, the two connecting plates are fixedly connected with the vehicle frame, and the two mounting plates are fixedly connected with the two connecting plates correspondingly. The multi-cavity layout of the straight beam can disperse stress, the straight beam can bear high-strength impact load, the two bracket units form two independent and parallel force transmission paths, and the front lower protection assembly can realize the lightweight target while guaranteeing the high-strength collision requirement.

Description

Technical Field

[0001] The present application relates to the technical field of tractor accessories, and more specifically, to a front underrun protection assembly and a tractor. Background Art

[0002] In the passive safety system of tractor vehicles, the front underrun protection device is a key component for protecting vulnerable road users such as pedestrians and cyclists, and can also reduce the risk of damage to core chassis components such as the engine and radiator in collision accidents. As the demand for fuel consumption optimization and transportation efficiency improvement in the commercial vehicle industry becomes increasingly urgent, reducing wind resistance and self-weight through aerodynamic optimization and lightweight design has become a core technical path for manufacturers to improve product competitiveness. The design of the front underrun protection assembly not only directly affects the overall vehicle safety performance, but the improvement of its structural lightweight and aerodynamic efficiency has also become an important research direction for balancing safety and economy.

[0003] However, traditional fixed front underrun protection devices generally adopt a casting structure, which has the problems of high mold opening cost, large weight and complex structure, resulting in persistently high development and manufacturing costs. The Chinese national standard GB26511 has extremely strict strength requirements for protection devices: for example, points P1 and P3 need to withstand a load of 80kN, and point P2 needs to withstand a load of 160kN. Such high-strength requirements often require customized design, which further extends the R&D cycle and increases costs. In the prior art, there is a significant contradiction between lightweight design and collision strength requirements. How to achieve structural lightweight while meeting the high-strength requirements of the national standard has become an urgent technical problem to be solved. Summary of Utility Model

[0004] In view of this, the present application provides a front underrun protection assembly and a tractor, aiming to solve the problem that the prior art can hardly meet both the requirements of high-strength collision and lightweight design.

[0005] In a first aspect, the present application provides a front underrun protection assembly, connected to a vehicle frame, comprising a cross beam and two bracket units; said cross beam comprises a straight beam, said straight beam extends along the width direction of the vehicle, and the cross section of said straight beam is a "Japanese-shaped" structure; two said bracket units are arranged symmetrically left and right with reference to the center of the extension direction of said straight beam, and in the extension direction of said straight beam, each said bracket unit is located at the P2 position of said cross beam; each said bracket unit comprises a mounting bracket and a connecting bracket; said mounting bracket comprises two mounting plates arranged at an interval, and both said mounting plates are fixedly connected with said straight beam; The connecting bracket comprises two connecting plates, both of the two connecting plates are fixedly connected with the vehicle frame, and the two mounting plates are respectively correspondingly and fixedly connected with the two connecting plates.

[0006] Preferably, the straight beam comprises two channel-shaped profiles, the open sides of the two channel-shaped profiles are arranged opposite to each other along the front-rear direction of the vehicle, one end of the open sides is fixedly connected, a mounting cavity is formed between the two channel-shaped profiles, and a reinforcing structure is arranged in the mounting cavity.

[0007] Preferably, the reinforcing structure is a profile member with a "日"-shaped cross-section formed by integrally bending a single plate, and the outer wall of the reinforcing structure abuts against the inner wall of the straight beam.

[0008] Preferably, the cross beam further comprises arc beams, the straight beam extends along the width direction of the vehicle, and the two arc beams are respectively fixedly connected with both ends of the straight beam.

[0009] Preferably, the cross beam further comprises a U-shaped fitting, and the open side of the U-shaped fitting faces the front side of the vehicle; the straight beam abuts against the inner wall of the U-shaped fitting, and both of the two mounting plates are fixedly connected with the U-shaped fitting.

[0010] Preferably, the two mounting plates are a first mounting plate and a second mounting plate which are sequentially arranged from the center of the extension direction of the straight beam to the side edges; the two connecting plates are a first connecting plate and a second connecting plate, the first connecting plate is of an L-shaped structure, the plate surface of a first plate of the first connecting plate is fixedly connected with the bottom surface of the vehicle frame, and the plate surface of a second plate of the first connecting plate abuts against the plate surface of the first mounting plate and is connected by bolts.

[0011] Preferably, the second connecting plate is connected with the side surface of the vehicle frame; the second mounting plate is fixedly connected with the U-shaped fitting, and the plate surface of the second mounting plate abuts against the plate surface of the second connecting plate and is connected by bolts.

[0012] Preferably, a connecting beam plate is arranged between the second mounting plate and the first mounting plate, the connecting beam plate is parallel to the second mounting plate, the connecting beam plate is fixedly connected with the second mounting plate, and the connecting beam plate is fixedly connected with the U-shaped fitting.

[0013] Preferably, the second connecting plate is provided with a triangular rib, and one side surface of the triangular rib abuts against the first vertical plate of the first connecting plate; The front underrun protection assembly further comprises a first reinforcement unit and a second reinforcement unit, wherein the first reinforcement unit comprises two first reinforcement plates arranged in a vertical direction and parallel to a horizontal plane, one side of each first reinforcement plate is fixedly connected with the connecting beam plate, and one side of each first reinforcement plate is fixedly connected with the straight beam; The second reinforcement unit comprises two second reinforcement plates arranged in a vertical direction and parallel to a horizontal plane, one side of each second reinforcement plate is fixedly connected with the second mounting plate, and one side of each second reinforcement plate is fixedly connected with the straight beam.

[0014] In a second aspect, the present application provides a traction vehicle, comprising the front underrun protection assembly provided in the first aspect of the present application.

[0015] Compared with the prior art, the front underrun protection assembly and the traction vehicle provided by the present application achieve at least the following beneficial effects: In the front underrun protection assembly and the traction vehicle provided by the present application, the cross section of the straight beam is of a "Japanese-shaped" structure, the multi-chamber layout of the straight beam can disperse stress, the straight beam can bear high-intensity impact load, which significantly improves the bending resistance and deformation resistance of the cross beam, and meanwhile, compared with the traditional casting structure, the straight beam greatly reduces the self weight. In addition, two support units are symmetrically arranged, and two connecting plates in each support unit are respectively correspondingly connected to two mounting plates, that is, each support unit adopts a "double-point aligned connection" structure, forming two independent and parallel force transmission paths. When the front underrun protection assembly is subjected to collision impact force, the force is transmitted to the two mounting plates through the cross beam, and then transmitted to the vehicle frame through the two connecting plates respectively, and the two force transmission paths uniformly distribute the load, improving the load-bearing limit and structural stability of the front underrun protection assembly. Thus, the front underrun protection assembly achieves the lightweight goal while meeting the requirement of high-strength collision resistance.

[0016] Of course, it is not necessary to specifically achieve all the above technical effects simultaneously to implement any product of the present application.

[0017] Other features and advantages of the present application will become clear through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. Description of Drawings

[0018] The accompanying drawings, which are incorporated in the specification and constitute a part of the specification, show embodiments of the present application, and together with the description, serve to explain the principle of the present application.

[0019] Figure 1 is a front structural schematic view of the front underrun protection assembly provided by an embodiment of the present application; Figure 2 is a rear structural schematic view of the front underrun protection assembly provided by an embodiment of the present application; Figure 3 is shown as Figure 2 Partial schematic diagram at point A in the middle; Figure 4 The figure shown is a three-dimensional structural schematic diagram of the front lower protection assembly provided in the embodiment of this application; Figure 5 As shown Figure 5 Partial schematic diagram at point B in the middle; Figure 6 The diagram shown is a schematic diagram of the connection structure between the support unit and the straight beam provided in the embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 10-Frame, 100-Crossbeam, 110-Straight beam, 111-Channel profile, 112-Reinforcing structure, 120-Circular arc beam, 130-U-shaped assembly, 200-Bracket unit, 201-Triangular rib, 210-Mounting plate, 211-First mounting plate, 212-Second mounting plate, 220-Connecting plate, 221-First connecting plate, 222-Second connecting plate, 213-Connecting beam plate, 310-First reinforcing plate, 320-Second reinforcing plate. Detailed Implementation

[0021] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0022] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0025] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, therefore, once an item is defined in one drawing, it will not be required to be further discussed in the subsequent drawings.

[0027] Figure 1 is a front view structural schematic diagram of a front lower protection assembly provided by an embodiment of the present application, Figure 2 is a rear view structural schematic diagram of the front lower protection assembly provided by an embodiment of the present application, Figure 3 is a Figure 2 partial schematic view of position A in

[0028] Referring to Figures 1 to 3 , an embodiment of the present application provides a front lower protection assembly connected to a vehicle frame 10, the front lower protection assembly comprises a cross beam 100 and two bracket units 200; the cross beam 100 comprises a straight beam 110, the straight beam 110 extends along the width direction of a vehicle, and the cross section of the straight beam 110 is a "日"-shaped (Japanese-shaped) structure; the two bracket units 200 are arranged symmetrically left and right with reference to the center of the extension direction of the straight beam 110, each bracket unit 200 comprises a mounting bracket and a connecting bracket; the mounting bracket comprises two mounting plates 210 arranged at intervals, and both the two mounting plates 210 are fixedly connected to the straight beam 110; the connecting bracket comprises two connecting plates 220, both the two connecting plates 220 are fixedly connected to the vehicle frame 10, and the two mounting plates 210 are respectively correspondingly fixedly connected to the two connecting plates 220.

[0029] in specific implementation, both the two mounting plates 210 can be fixedly connected to the straight beam 110 by welding, both the two connecting plates 220 can be fixedly connected to the vehicle frame 10 by bolts, and the connecting plate 220 and the corresponding mounting plate 210 can also be fixedly connected by bolts.

[0030] in the front lower protection assembly provided in this embodiment, the cross section of the straight beam 110 is a "日"-shaped (Japanese-shaped) structure, the multi-chamber layout of the straight beam 110 can disperse stress, the straight beam 110 can bear high-intensity impact load, significantly improving the bending resistance and deformation resistance of the cross beam 100. Meanwhile, compared with the traditional casting structure, the straight beam 110 greatly reduces the dead weight. In addition, the two bracket units 200 are symmetrically arranged, and the two connecting plates 220 in each bracket unit 200 are respectively correspondingly connected to the two mounting plates 210, that is, each bracket unit 200 adopts a "double-point alignment connection" structure, forming two independent and parallel force transmission paths. When the front lower protection assembly receives collision impact force, the force can be transmitted to the two mounting plates 210 through the cross beam 100, and then transmitted to the vehicle frame 10 through the two connecting plates 220 respectively, the two force transmission paths evenly distribute the load, improving the load-bearing limit and structural stability of the front lower protection assembly. Thus, the front lower protection assembly achieves the lightweight goal while meeting the high-strength collision requirement.

[0031] Figure 4 is a schematic diagram of the three-dimensional structure of a front underrun protection assembly provided by an embodiment of the present application, Figure 5 which is a Figure 5 partial schematic diagram of position B in

[0032] Referring to Figure 4 and Figure 5 , in some embodiments, the straight beam 110 comprises two channel profiles 111. Open sides of the two channel profiles 111 are oppositely arranged along the front-rear direction of the vehicle, and one end of the open sides are fixedly connected. A mounting cavity is formed between the two channel profiles 111, and a reinforcing structure 112 is arranged in the mounting cavity.

[0033] In this embodiment, the straight beam 110 is composed of two channel profiles 111, the open sides of which are oppositely arranged along the front-rear direction of the vehicle, and one end can be fixedly connected by means of welding or the like. This "butt-jointed" structure itself forms a cavity with certain torsion and bending resistance; in addition, the reinforcing structure 112 is arranged in the mounting cavity, and through the synergy of the reinforcing structure 112 and the two channel profiles 111, stress can be further dispersed, the overall rigidity of the straight beam 110 can be improved, and thus the structural rigidity of the front underrun protection assembly can be improved.

[0034] With continued reference to Figure 5 , in some embodiments, the reinforcing structure 112 is a profile member with a "日"-shaped cross-section formed by integrally bending a single plate, and the outer wall of the reinforcing structure 112 abuts against the inner wall of the straight beam 110.

[0035] In this embodiment, the reinforcing structure 112 divides the mounting cavity into a plurality of sub-cavities, which enables the load applied to the straight beam 110 to be dispersed to the channel profiles 111, avoiding stress accumulation in local areas; the reinforcing structure 112 is an integrally formed structure, which reduces stress concentration and improves fatigue resistance. The outer wall of the reinforcing structure 112 is closely attached to the straight beam 110, ensuring that the reinforcing structure 112 and the channel profiles 111 form a rigid whole, which can deform synchronously and bear loads cooperatively when stressed, thus improving the load-bearing capacity of the straight beam 110, and further improving the load-bearing capacity of the front underrun protection assembly.

[0036] Referring to Figure 1 and Figure 2 , in some embodiments, the cross beam 100 further comprises arc beams 120, and the two arc beams 120 are respectively fixedly connected with two ends of the straight beam 110.

[0037] In specific implementation, the arc beams 120 bend toward the rear end of the vehicle to meet the matching requirement between the front underrun protection assembly and the contour of the front bumper of the vehicle body, so that the clearances between components are uniform and reasonable.

[0038] Referring to Figures 2 to 4, in some embodiments, the cross beam 100 further comprises a U-shaped fitting 130, and the open side of the U-shaped fitting 130 faces the front side of the vehicle; the straight beam 110 abuts against the inner wall of the U-shaped fitting 130, and both two mounting plates 210 are fixedly connected to the U-shaped fitting 130.

[0039] In this embodiment, the open side of the U-shaped fitting 130 faces the front side of the vehicle, and the straight beam 110 abuts against the inner wall of the U-shaped fitting 130, forming a semi-enclosed protection for the straight beam 110. The inner wall of the U-shaped fitting 130 provides support for the straight beam 110. When a collision occurs in front of the vehicle, the U-shaped fitting 130 can first bear part of the impact force and disperse it to the entire cross beam 100. Cooperating with the "日"-shaped structure of the straight beam 110 itself and the internal reinforcing structure 112, the overall bending resistance and deformation resistance of the cross beam 100 are improved. The U-shaped fitting 130 replaces the connection mode in which the mounting plates 210 are directly connected to the straight beam 110. As a transition connecting piece, the U-shaped fitting 130 prevents the connection points from being damaged.

[0040] See Figure 2 and Figure 3 , in some embodiments, the two mounting plates 210 are a first mounting plate 211 and a second mounting plate 212 which are sequentially arranged from the center in the extension direction of the straight beam 110 to the side edges; the two connecting plates 220 are a first connecting plate 221 and a second connecting plate 222. The first connecting plate 221 has an L-shaped structure. The plate surface of the first plate of the first connecting plate 221 is fixedly connected to the bottom surface of the vehicle frame 10, and the plate surface of the second plate of the first connecting plate 221 abuts against the plate surface of the first mounting plate 211 and is connected thereto by bolts.

[0041] In this embodiment, the first plate of the L-shaped first connecting plate 221 is fixed to the bottom surface of the vehicle frame 10, and the second plate is connected to the first mounting plate 211, forming a "vertical steering" force transmission path. The binding force of the vehicle frame 10 can be transmitted to the second plate through the first plate of the L-shaped first connecting plate 221, and then vertically act on the first mounting plate 211, effectively coping with the longitudinal (front-rear direction of the vehicle) and vertical (up-down direction) impact forces applied to the front lower protection assembly during vehicle running. This structure can decompose loads in different directions into normal pressure on the plates, avoiding local stress concentration caused by the non-perpendicularity between the force direction and the connection surface. Especially when a 160kN load is borne at the P2 position, the impact force can be transmitted to the vehicle frame 10 more efficiently, and the impact resistance of the overall structure is improved.

[0042] See Figure 2 and Figure 3 , in some embodiments, the second connecting plate 222 is connected to the side surface of the vehicle frame 10; the second mounting plate 212 is fixedly connected to the U-shaped fitting 130, and the plate surface of the second mounting plate 212 abuts against the plate surface of the second connecting plate 222 and is connected thereto by bolts.

[0043] In this embodiment, the second connecting plate 222 is connected to the side of the frame 10, forming a vertical spatial distribution with the first connecting plate 221 (connecting to the bottom surface of the frame 10). Together with the corresponding mounting plates 210, they construct a three-dimensional constraint structure of "bottom surface + side surface". This layout can resist longitudinal, vertical and lateral impact forces simultaneously. Through the effect of dispersing forces in multiple directions, it can avoid overload in a single direction and significantly improve the structural stability of the front lower protection assembly under complex working conditions.

[0044] Figure 6 The diagram shown is a schematic diagram of the connection structure between the support unit and the straight beam provided in the embodiment of this application.

[0045] See Figure 3 and Figure 6 In some embodiments, a connecting beam plate 213 is provided between the second mounting member 212 and the first mounting plate 211. The connecting beam plate 213 is parallel to the second mounting plate 212 and is fixedly connected to the second mounting plate 212. The connecting beam plate 213 is also fixedly connected to the U-shaped assembly 130.

[0046] In this embodiment, the connecting beam plate 213 is fixed to the U-shaped fitting 130, further strengthening the integrity of the second mounting plate 212 and the U-shaped fitting 130. In specific implementation, the second mounting plate 212 and the connecting beam plate 213 can be integrally formed. When the second connecting plate 222 transmits lateral or vertical forces, the force can be directly transmitted through the second mounting plate 212, or it can be diverted to the U-shaped fitting 130 through the connecting beam plate 213, reducing force loss during transmission and enhancing the overall rigidity of the connection area between the second mounting plate 212 and the U-shaped fitting 130.

[0047] See Figure 3 In some embodiments, the second connecting plate 222 is provided with a triangular rib 201, and one side of the triangular rib 201 abuts against the bottom surface of the first plate of the first connecting plate 221.

[0048] The front lower protection assembly also includes a first reinforcing unit and a second reinforcing unit. The first reinforcing unit includes two first reinforcing plates 310 arranged vertically and parallel to the horizontal plane. One side of each first reinforcing plate 310 is fixedly connected to the connecting beam plate 213, and one side of each first reinforcing plate 310 is fixedly connected to the straight beam 110. The second reinforcing unit includes two second reinforcing plates arranged vertically and parallel to the horizontal plane. One side of each second reinforcing plate 320 is fixedly connected to the second mounting plate 212, and one side of each second reinforcing plate 320 is fixedly connected to the straight beam 110.

[0049] In this embodiment, the second connecting plate 222 is provided with triangular ribs 201, and one side of the triangular ribs 201 abuts against the bottom surface of the first plate of the first connecting plate 221, forming a triangular stable support structure. This enhances the connection rigidity between the first connecting plate 221 and the second connecting plate 222, effectively resists the relative torsional force between them, and improves the structural strength of the connecting plate 220. The two first reinforcing plates 310 of the first reinforcing unit are arranged vertically, connecting the connecting beam plate 213 and the straight beam 110, enhancing the connection strength between them and improving the local rigidity of the straight beam 110. The two second reinforcing plates 320 of the second reinforcing unit are arranged vertically, connecting the second mounting plate 212 and the straight beam 110, further dispersing the load, suppressing the structural deformation of the straight beam 110, and further improving the structural mechanical performance of the front lower protection assembly. The vertically arranged parallel reinforcing plates form a three-dimensional support, optimizing the force transmission path and reducing stress concentration. This improves the collaborative load-bearing capacity of the connecting beam plate 213, the second mounting plate 212, and the straight beam 110, making the crossbeam 100 more stable under load. It helps the overall structure meet high strength requirements, while enhancing durability and adapting to complex working conditions.

[0050] Based on the same inventive concept, this application also provides a tractor unit. The tractor unit provided in this embodiment includes the front underrun protection assembly of any of the above embodiments of this application.

[0051] It is understood that the tractor provided in this application embodiment can be a freight tractor, a passenger tractor, an engineering tractor, etc., and this application does not impose specific limitations on it. The tractor provided in this application embodiment has the beneficial effects of the front lower protection assembly provided in this application embodiment. For details, please refer to the specific description of the front lower protection assembly in the above embodiments, which will not be repeated here.

[0052] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A front lower guard assembly for attachment to a vehicle frame, the front lower guard assembly comprising: comprising a crossbeam and two support units; the crossbeam comprises a straight beam, the straight beam extends along the width direction of a vehicle, and the cross section of the straight beam is a "Japanese" shaped structure; the two support units are arranged symmetrically left and right with reference to the center of the extension direction of the straight beam, each support unit comprises a mounting bracket and a connecting bracket, the mounting bracket comprises two mounting plates arranged at an interval, and both of the two mounting plates are fixedly connected to the straight beam; the connecting bracket comprises two connecting plates, both of the two connecting plates are fixedly connected to a vehicle frame, and the two mounting plates are respectively and correspondingly fixedly connected to the two connecting plates.

2. The front lower guard assembly as described in claim 1, characterized in that, the straight beam comprises two channel-shaped profiles, the open sides of the two channel-shaped profiles are arranged oppositely along the front-rear direction of the vehicle and one end of the open sides are fixedly connected, a mounting cavity is formed between the two channel-shaped profiles, and a reinforcing structure is arranged in the mounting cavity.

3. The front lower protection assembly as described in claim 2, characterized in that, the reinforcing structure is a profile piece with a "Japanese"-shaped cross section formed by an integrated bending process from a single plate, and the outer wall of the reinforcing structure abuts against the inner wall of the straight beam.

4. The front lower guard assembly as described in claim 1, characterized in that, the crossbeam further comprises arc beams, the straight beam extends along the width direction of the vehicle, and the two arc beams are respectively and fixedly connected to two ends of the straight beam.

5. The front underguard assembly of claim 2, wherein, the crossbeam further comprises a U-shaped fitting member, the open side of the U-shaped fitting member faces the front side of the vehicle; the straight beam abuts against the inner wall of the U-shaped fitting member, and both of the two mounting plates are fixedly connected to the U-shaped fitting member.

6. The front lower guard assembly as described in claim 5, characterized in that, the two mounting plates are a first mounting plate and a second mounting plate which are sequentially arranged from the center of the extension direction of the straight beam to the side edges; the two connecting plates are a first connecting plate and a second connecting plate, the first connecting plate is of an L-shaped structure, the plate surface of a first plate of the first connecting plate is fixedly connected to the bottom surface of the vehicle frame, and the plate surface of a second plate of the first connecting plate abuts against the plate surface of the first mounting plate and is connected therewith by bolts.

7. The front lower guard assembly as described in claim 6, characterized in that, the second connecting plate is connected to the side surface of the vehicle frame; the second mounting plate is fixedly connected to the U-shaped fitting member, and the plate surface of the second mounting plate abuts against the plate surface of the second connecting plate and is connected therewith by bolts.

8. The front lower guard assembly as described in claim 7, characterized in that, a connecting beam plate is arranged between the second mounting plate and the first mounting plate, the connecting beam plate is parallel to the second mounting plate, the connecting beam plate is fixedly connected to the second mounting plate, and the connecting beam plate is fixedly connected to the U-shaped fitting member.

9. The front lower guard assembly as described in claim 8, characterized in that, the second connecting plate is provided with a triangular rib, one side surface of the triangular rib abuts against a first vertical plate of the first connecting plate; the front underride protection assembly further comprises a first reinforcing unit and a second reinforcing unit, the first reinforcing unit comprises two first reinforcing plates arranged in a vertical direction and parallel to a horizontal plane, one side of each first reinforcing plate is fixedly connected to the connecting beam plate, and one side of each first reinforcing plate is fixedly connected to the straight beam; the second reinforcing unit comprises two second reinforcing plates arranged in a vertical direction and parallel to a horizontal plane, one side of each second reinforcing plate is fixedly connected to the second mounting plate, and one side of each second reinforcing plate is fixedly connected to the straight beam.

10. A towing vehicle characterized in that comprising the front underride protection assembly according to any one of claims 1 to 9.

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