Rear bumper and semitrailer

Abstract

The invention discloses a rear bumper and a semitrailer, and relates to the technical field of semitrailers, the rear bumper comprises an integrally-formed main body, and the main body is divided into a vertical section and a horizontal section; the transition sections are connected with the two ends of the vertical section respectively; the at least one fixed section is connected with one end, far away from the vertical section, of one transition section; one end of the movable section is connected with one end, far away from the vertical section, of the other transition section, the other end of the movable section extends towards the side wall of the vertical section, and the upper side of the movable section is fixedly connected with the fixed section; the energy absorption section is connected to the end, facing the vertical section, of the movable section. The invention further discloses a semitrailer. The semitrailer comprises the rear bumper and a semitrailer chassis. The technical problems that an existing rear bumper is high in process cost, complex in structure and insufficient in impact resistance are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of semi-trailers, and in particular to a rear bumper and a semi-trailer. Background Art

[0002] With the rapid development of the global road transportation industry, semi-trailers, as the main tools for cargo transportation, have received extensive attention for their safety performance. In vehicle rear-end collision accidents, the lack of effective protection measures at the rear of semi-trailers may cause small vehicles to be involved under the semi-trailers, resulting in serious casualties and property losses. Therefore, countries have put forward strict regulatory requirements for the design of semi-trailer rear bumpers, which not only need to meet the standards of performance and dimensions, but also need to take into account practical requirements such as lightweight and easy installation.

[0003] Most of the existing rear bumper designs adopt simple structures. Although they can provide basic protection functions, they generally have problems such as large weight, insufficient anti-impact performance, and complex processes, and there is also a slight lack of aesthetics. Therefore, there is an urgent need to develop a new type of rear bumper with high strength, low process cost and aesthetics to meet the safety requirements and application scenarios of modern road transport vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide a rear bumper and a semi-trailer, which solve the technical problems of high process cost, complex structure and insufficient anti-impact performance in the prior art.

[0005] An embodiment of the present application discloses a rear bumper, including an integrally formed main body, and the main body is divided into: A vertical section; At least two transition sections, and the transition sections are respectively connected to both ends of the vertical section; At least one fixed section, which is connected to one end of one of the transition sections away from the vertical section; At least one movable section, one end of which is connected to one end of the other transition section away from the vertical section, and the other end extends towards the side wall of the vertical section, and the upper side of the movable section is fixedly connected to the fixed section; At least one energy-absorbing section, which is connected to one end of the movable section facing the vertical section.

[0006] The present application designs the rear bumper to be an integrally formed part, and at the same time, only one weld is provided, which simplifies the manufacturing process and reduces the manufacturing cost; at the same time, the structure is designed to form a structure similar to a Chinese character 'Ri' with the left side lower and the right side higher, so as to ensure the overall strength and anti-impact performance.

[0007] On the basis of the above technical solutions, the embodiments of the present application can also be improved as follows: Furthermore, the vertical section is provided with a recess. The beneficial effect of adopting this step is that the recess can facilitate the subsequent installation of the reflective strip, that is, sufficient installation space is left.

[0008] Furthermore, it also includes a reflector and / or a reflective strip, wherein the reflector is installed on the side of the vertical section, and the reflective strip is arranged in the recess of the vertical section. The beneficial effect of adopting this step is that a warning effect can be achieved through the reflective strip and the reflector.

[0009] Furthermore, the two ends of the vertical section are connected to the end of the transition section to form a convex rib portion. The beneficial effect of adopting this step is that the convex rib portion can further ensure the strength of the whole at the bending point.

[0010] Furthermore, the outer edge surface of the rib portion is a smooth transition. The beneficial effect of adopting this step is that it can effectively prevent stress concentration and avoid local cracking, thereby ensuring the stability of the structure of the present application.

[0011] Furthermore, the transition section is in the shape of an outwardly convex arc. The beneficial effect of adopting this step is that the outwardly convex arc can effectively reduce the wind resistance of the semi-trailer during driving, thereby further improving the fuel economy of the vehicle.

[0012] Furthermore, the transition section is symmetrical about the center line of the vertical section. The beneficial effect of adopting this step is that the linearity of the overall structural appearance is ensured through the symmetrical structure, which can better reduce wind resistance.

[0013] Furthermore, the fixed section and the movable section are both L-shaped, and the horizontal portion of the fixed section is fixed by welding to the horizontal portion of the movable section; The vertical length of the fixed section is L1, the vertical length of the movable section is L2, the length of the vertical section is L3, L1+L2>L3. The beneficial effect of adopting this step is that through the specific shape and length design, a size of lower left and higher right can be formed, thereby effectively reducing wind resistance.

[0014] Furthermore, the energy absorbing section is perpendicular to the horizontal portion of the vertical section, and the energy absorbing section extends toward the movable section away from the fixed section. The beneficial effect of this step is that surface contact can be achieved through the energy absorbing section, thereby improving impact resistance.

[0015] The present application also discloses a semitrailer, comprising a rear bumper and a semitrailer chassis, wherein the semitrailer chassis is installed on the side of the rear bumper where the fixed section is located.

[0016] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. The present application is an integrally formed part, which is formed in one step by roll-pressing technology, and combines a fixed section, a movable section and an energy-absorbing section through cross-sectional design, thereby improving the strength and stability of the rear bumper.

[0017] 2. In the present application, the fixed section and the movable section are fixed by only one weld, and the remaining movable section and the energy absorbing section cooperate to form an energy absorbing effect, which can improve the impact resistance of the rear bumper.

[0018] 3. The rear bumper in this application has significant advantages in terms of manufacturing cost, installation convenience, optimization of production time, and improvement of the aesthetics of the semi-trailer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a front view of a rear bumper according to a specific embodiment 1 of the present invention; Figure 2 for Figure 1 Axonometric view of Figure 3 It is a schematic diagram of a section of a rear bumper according to the specific embodiment 1 of the present invention; Figure 4 This is a schematic structural diagram of a rear bumper (including a reflective strip) according to a specific embodiment 1 of the present invention; Figure 5 It is a partial structural schematic diagram of a semi-trailer according to a specific embodiment 2 of the present invention; Reference numerals: 1-main body; 2-vertical section; 3-transition section; 4-fixed section; 5-movable section; 6-energy absorption section; 7-reflector; 8-rear bumper; 9-semi-trailer chassis; 10-reflective strip; 201-concave part; 202-convex rib part. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0022] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0023] In this application, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0025] Embodiment 1: As Figure 1-4 shown, the embodiment of the present application discloses a rear bumper, which is lighter in mass compared with the existing bumpers. Through the methods of integral molding and multiple foldings, the strength is ensured; at the same time, the present application is also provided with a movable section, which cooperates with an energy absorption section to achieve the energy absorption effect, and moreover, the present application can have only one weld seam or two weld seams, and the production is convenient.

[0026] As Figure 1 、 3 shown, the specific structure of the present application is as follows, including a main body 1 formed by integral molding, specifically by using roll forming technology to form in one step, which can greatly improve the manufacturing efficiency and significantly reduce the production cost; therefore, by using roll forming technology to form in one step, the steps of multiple processing and assembly are reduced, that is, compared with the existing assembled rear bumper, the whole production process is made more smooth and efficient. At the same time, roll forming technology to form in one step can also significantly reduce the production cost, because it reduces material waste and additional labor costs, making the product more economical and affordable while ensuring the quality, with low cost.

[0027] The longitudinal section of the main body 1 is a polygon with the left side lower and the right side higher, similar to the shape of the Chinese character "Ri" (日). At the same time, for the convenience of assembly, the present application is provided with a plurality of bolt mounting holes at intervals on the main body 1; to ensure that the present application can be used for a long time, the main body 1 in the present application can be made of Q700 or Q550D steel. Further, an anti-corrosion coating can also be added to meet the use requirements in harsh environments, while extending the service life, reducing the maintenance cost caused by corrosion, and bringing longer use guarantee for users. At the same time, the longitudinal section of the main body 1 in the present application is in the shape of the Chinese character "Ri" (日), and an arc transition is adopted at the bending part, avoiding stress concentration, reducing the generation of cracks, and further ensuring the strength of the rear bumper.

[0028] In one embodiment, the present application further describes the overall structure of the main body 1, wherein the main body 1 is divided into: A vertical section 2, the vertical section 2 is used to install a reflective strip; At least two transition sections 3, the transition sections 3 are respectively connected to the two ends of the vertical section 2, and the transition sections 3 are preferably arc-shaped to form a curved surface, which effectively reduces the wind resistance of the semi-trailer during driving and further improves the fuel economy of the vehicle. At the same time, the transition sections 3 are also convenient for subsequent formation of a certain space, so as to facilitate energy absorption and effectively ensure safety; At least one fixing section 4 is connected to one end of one of the transition sections 3 away from the vertical section 2, and the fixing section 4 is subsequently fixed by welding. Preferably, from a longitudinal section, the fixing section 4 has a horizontal portion to facilitate welding and fixation, while also ensuring the structural stability of the main body 1; At least one movable section 5, one end of which is connected to one end of another transition section 3 away from the vertical section 2, and the other end of which extends toward the side wall of the vertical section 2, and the upper side of the movable section 5 is connected to the fixed section 4; the movable section 5 mainly plays the role of energy absorption, and its end is directly and loosely connected to the vertical section 2, so that it can play the role of energy absorption, thereby ensuring safety; At least one energy absorbing section 6 is connected to one end of the movable section 5 facing the vertical section 2. The energy absorbing section 6 is not fixedly connected to the inner wall of the vertical section 2 or the energy absorbing section 6 is welded to the vertical section 2 to achieve energy absorption and increase the contact area between the movable section 5 and the vertical section 2. When absorbing energy, the energy absorption effect can be guaranteed, thereby improving the safety performance of the vehicle.

[0029] For further explanation of this application, this application is an integrally formed part, specifically, one-step forming by roll pressing technology, which greatly improves manufacturing efficiency and significantly reduces production costs; at the same time, the material used in this application is Q700 or Q550D, combined with the longitudinal section formed as shown Figure 1 The left-low-right-high structure shown in the figure not only ensures strength, but also has excellent energy absorption and impact resistance performance.

[0030] When the bumper in the present application is in operation, after being hit, the movable section 5 will move toward the vertical section 2. If energy is absorbed only by the movable section 5, the contact area between the movable section 5 and the vertical section 2 is small, which may easily lead to concentrated force and damage to the vertical section 2, that is, the entire bumper loses its own function. The present application adds an energy absorbing section 6, which extends vertically downward, so that the entire side of the energy absorbing section 6 is in contact, which not only ensures the uniform distribution of energy during the transmission process, but also can further ensure the stability of the entire structure and reduce the risk of local force. At the same time, the energy absorbing section 6 is bent downward, which is also convenient for production and bending.

[0031] In order to further improve the function of this application as a rear bumper, such as Figure 1 , 4 As shown, it also includes a reflector 7 and / or a reflective strip 10, the reflector 7 is installed on the side of the vertical section 2, and the reflective strip 10 is arranged in a recess 201 of the vertical section 2, and the recess 201 is convenient for the subsequent installation of the reflective strip 10, that is, the reflective strip 10 is arranged in the recess 201 of the vertical section 2, and the recess 201 not only provides a space for the built-in reflective strip, thereby improving the practicality, but also improves the appearance of the semi-trailer.

[0032] At the same time, such a design not only ensures the stable installation of the reflective strip 10, but also effectively avoids the risk of it falling off due to factors such as bumps or wind during driving; the reflective strip 10 can be installed by bolt connection or other connection methods to ensure its stable installation in the rear bumper and effectively play a warning role; the reflector 7 is also the same, which is a triangular reflector 7 and can provide a warning function.

[0033] The present application is an integrally formed part, and a design is required at the bending part to ensure the strength of the rear bumper. Specifically, the two ends of the vertical section 2 in the present application are connected to the end of the transition section 3 to form a convex rib portion 202, and the outer edge surface of the convex rib portion 202 is a smooth transition; first, the convex rib portion 202 is at least two, which are parallel and spaced apart; secondly, the convex ribs of the present application significantly enhance the strength and rigidity of the rear bumper, and the convex ribs adopt a smooth transition, which can effectively prevent stress concentration and avoid local cracking.

[0034] Specifically, the transition section 3 is an outwardly convex arc, which can form a polygonal structure with a longitudinal section that is low on the left and high on the right, which can effectively reduce the wind resistance of the semi-trailer during driving and further improve the fuel economy of the vehicle. When the semi-trailer is driving, the air will flow along the outer edge of the bumper, and the convex arc-shaped transition section 3 can guide the airflow to bypass the vehicle body more smoothly, reducing the turbulence and vortex of the airflow, thereby reducing the wind resistance coefficient. This improvement not only helps to improve the fuel economy of the vehicle, reduce energy consumption and emissions, but also improves the driving stability and comfort of the vehicle.

[0035] In order to further reduce wind resistance, Figure 3 As shown, the present application designs the transition section 3, and the transition section 3 is symmetrical about the center line of the vertical section 2, which can further reduce the wind resistance.

[0036] The fixed section 4 and the movable section 5 in the present application are both L-shaped, and the horizontal portion of the fixed section 4 is welded and fixed to the horizontal portion of the movable section 5, that is, the connection between the fixed section 4 and the movable section 5 is the only connection of the main body, that is, a weld, which significantly reduces the man-hours required for the production of the semi-trailer, and the horizontal portion of the fixed section 4 of the present application is shorter than the horizontal portion of the movable section 5, which can save materials and reduce costs; The vertical length of the fixed section 4 is L1, the vertical length of the movable section 5 is L2, and the length of the vertical section 2 is L3, L1+L2>L3. By utilizing the length design, the longitudinal section of the main body in the present application can achieve a structure with low left and high right, which can better improve the strength. At the same time, it can also effectively reduce the wind resistance of the semi-trailer during driving, and further improve the fuel economy of the vehicle.

[0037] In order to better improve the energy absorption effect, the energy absorbing section 6 in the present application is perpendicular to the horizontal part of the vertical section 2, and the energy absorbing section 6 extends toward the movable section 5 away from the fixed section 4. Specifically, the energy absorbing section 6 extends downward, so that when it contacts the vertical section 2, it is surface contact, which can better ensure the stability of the structure.

[0038] At the same time, there may be a gap between the energy absorbing section 6 and the vertical section 2 of the present application, or they may be in direct contact, and the adjustment is made according to the actual situation.

[0039] Further explanation for this application: The embodiment of the present application discloses a rear bumper structure, which is an integrally formed part, specifically, is formed in one step using a rolling technology. After meeting the strength requirements of the bumper, the manufacturing efficiency is significantly improved and the production cost is reduced. Compared with the multiple welds used in the existing rear bumper, the present application only uses a method of matching and connecting a fixed section and a movable section, that is, only one weld is required (a weld between the fixed section and the movable section), thereby significantly reducing the production hours of the semi-trailer. The present application forms a polygonal structure that is low on the left and high on the right, without the need for additional processing. In the event of a collision, the structural design plays a role similar to that of a spring, and the structure can absorb a certain amount of impact energy and resist deformation, thereby improving the safety performance of the semi-trailer.

[0040] In order to further confirm the impact resistance of the bumper, for this application, simulation software was used for simulation, where the material was q700 steel, the thickness was 3mm, the length was 2300mm, and the load was 50000N. The national standard requires that the maximum deformation be less than or equal to 150mm. Considering the simulation safety factor, the maximum deformation of the simulation result is less than or equal to 100mm. The simulation result shows that the maximum deformation of the bumper is 93mm, which meets the requirements. That is, it meets the strength requirements, that is, it can realize the protection function of the bumper itself.

[0041] Embodiment 2: like Figure 5 As shown, based on Example 1, the embodiment of the present application discloses a semi-trailer, including the aforementioned rear bumper 8 and a semi-trailer chassis 9, wherein the semi-trailer chassis 9 is installed on the side where the vertical portion of the fixed section of the rear bumper 8 is located, that is, the connection with the semi-trailer chassis 9 is completed through the bolt connection holes of the rear bumper.

[0042] The semi-trailer in this embodiment has the rear bumper 8 described in Embodiment 1 as its core component. As an important protective device at the rear of the vehicle, the rear bumper not only has the basic anti-collision function, but also incorporates the advanced energy absorption design concept, which can effectively absorb the collision energy and protect the vehicle safety. The semi-trailer chassis 9, as a key structure for carrying goods and connecting to the tractor, needs to meet the working requirements of the semi-trailer.

[0043] The rear bumper 8 and the semi-trailer chassis 9 in the present application are connected by bolts, which is a detachable connection method. A plurality of bolt holes are also provided on the rear bumper 8, which can be divided into multiple rows, so as to facilitate subsequent alignment and connection. At the same time, through the tightening effect of high-strength bolts, the rear bumper 8 and the semi-trailer chassis 9 are firmly connected together to form an integral structure. This connection method is not only convenient for installation and disassembly, but also can absorb part of the energy through the elastic deformation of the bolts when the vehicle encounters a collision, further improving the safety of the vehicle.

[0044] In combination with the above, the streamlined design of the rear bumper 8 and the reasonable layout with the semi-trailer chassis 9 in the present application effectively reduce the wind resistance of the vehicle during driving, thereby improving fuel economy. This means lower operating costs and longer cruising range for long-distance transport semi-trailers.

[0045] The semi-trailer design disclosed in this embodiment provides a safer, more efficient and economical solution for modern transportation through an innovative connection method between the rear bumper and the chassis, an optimized structural layout and a series of advanced design concepts.

[0046] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A rear bumper, characterized in that: It comprises an integrally formed main body (1), wherein the main body (1) is divided into: vertical segment (2); At least two transition sections (3), the transition sections (3) being respectively connected to two ends of the vertical section (2); At least one fixed section (4) connected to an end of one of the transition sections (3) away from the vertical section (2); at least one movable section (5), one end of which is connected to one end of another transition section (3) away from the vertical section (2), and the other end of which extends in a direction toward the side wall of the vertical section (2), and the upper side of the movable section (5) is fixedly connected to the fixed section (4); At least one energy absorbing section (6) is connected to one end of the movable section (5) facing the vertical section (2).

2. The rear bumper according to claim 1, characterized in that: The vertical section (2) is provided with a recess (201).

3. The rear bumper according to claim 2, characterized in that: It also includes a reflector (7) and / or a reflective strip (10), wherein the reflector (7) is mounted on the side of the vertical section (2), and the reflective strip (10) is arranged in a recess (201) of the vertical section (2).

4. The rear bumper according to claim 2, characterized in that: Both ends of the vertical section (2) are connected to the end of the transition section (3) to form a convex rib portion (202).

5. The rear bumper according to claim 4, characterized in that: The outer edge surface of the convex rib portion (202) is a smooth transition.

6. The rear bumper according to claim 1, characterized in that: The transition section (3) is in an outwardly convex arc shape.

7. The rear bumper according to claim 1, characterized in that: The transition section (3) is symmetrical about the center line of the vertical section (2).

8. The rear bumper according to claim 1, characterized in that: The fixed section (4) and the movable section (5) are both L-shaped, and the horizontal portion of the fixed section (4) and the horizontal portion of the movable section (5) are fixed by welding; The length of the vertical portion of the fixed section (4) is L1, the length of the vertical portion of the movable section (5) is L2, the length of the vertical section (2) is L3, and L1+L2>L3.

9. The rear bumper according to claim 8, characterized in that: The energy absorbing section (6) is perpendicular to the horizontal portion of the vertical section (2), and the energy absorbing section (6) extends in a direction away from the fixed section (4) towards the movable section (5).

10. A semi-trailer, characterized in that: It comprises the rear bumper (8) and the semitrailer chassis (9) as claimed in any one of claims 1 to 9, wherein the semitrailer chassis (9) is mounted on the side of the rear bumper (8) where the fixed section (4) is located.

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