A truck rear guard device

Abstract

This invention relates to the field of vehicle equipment technology, specifically to a rear protective device for trucks, addressing the problem that existing rear guardrails can cause significant damage to following vehicles even in low-speed collisions. The rear protective device includes a mounting base installed below the rear of the truck; a sleeve installed on the mounting base; a swing arm with its upper end fixedly connected to the sleeve; a guardrail fixedly installed at the lower end of the swing arm; a first limiting rod located at the rear of the truck; a second limiting rod located at the rear of the truck; the first and second limiting rods are distributed on both sides of the swing arm, limiting the swing range of the swing arm; and a resistance spring with its two ends connected to the truck and the swing arm, respectively. Through the swing of the swing arm and the limitation imposed by the resistance spring, the initial impact force is reduced, thereby significantly weakening the damage caused to following vehicles in low-speed collisions, thus protecting the following vehicles.

Description

Technical Field

[0001] This invention relates to the field of vehicle equipment technology, and in particular to a rear protective device for trucks. Background Technology

[0002] Currently, to effectively prevent other vehicles from impacting the underside of a semi-trailer from a rear-end collision, trucks are typically equipped with rear underrun protection devices. Additionally, due to the relatively high height of semi-trailers and other trucks, rear underrun protection barriers are usually installed starting from a lower position to protect occupants of following vehicles during a collision and prevent them from crawling under. However, existing rear underrun protection barriers are entirely rigid, which can cause significant damage to following vehicles even in low-speed collisions, while the injury to occupants in low-speed collisions is minimal. Therefore, a completely rigid rear underrun protection barrier can actually increase property damage in low-speed collisions.

[0003] The prior art CN2021209218040 discloses a rear protective folding mechanism for a truck, including a frame and a crash beam. The crash beam is connected to the frame via a connecting bracket, which includes a vertical bracket. The upper end of the vertical bracket is hinged to the frame via a first rotating joint. The position of the crash beam can be changed by rotating and folding, but it is mainly for the protection of the truck itself, not for the protection of other vehicles. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a rear protection device for trucks to solve the problem that existing rear guardrails can cause relatively high damage to following vehicles even in low-speed collisions.

[0005] To achieve the above objectives, the present invention provides a rear protective device for a truck, comprising a mounting base installed below the rear of the truck; a sleeve installed on the mounting base; a swing arm with its upper end fixedly connected to the sleeve; a guardrail fixedly disposed at the lower end of the swing arm; a first limiting rod disposed at the rear of the truck; a second limiting rod disposed at the rear of the truck; the first limiting rod and the second limiting rod are distributed on both sides of the swing arm to limit the swing range of the swing arm; and a resistance spring with its two ends connected to the truck and the swing arm, respectively.

[0006] As a further improvement of this application, the truck rear protection device further includes a locking mechanism, which includes a positioning tube disposed on the mounting base, a rotator disposed on the sleeve, and a centrifugal control unit disposed on the rotator. The rotator is inserted into the positioning tube, and the rotator and the positioning tube are in clearance fit. The rotator is provided with a mounting groove, and the centrifugal control unit is disposed in the mounting groove. The centrifugal control unit includes an elastic element with one end disposed in the mounting groove and a limiting block disposed at the free end of the elastic element. When stationary or rotating at low speed, the limiting block is restricted in the mounting groove under the action of elastic force, and the rotator and the positioning tube can rotate freely. When the rotation speed is too fast, under the action of centrifugal force, the limiting block overcomes the elastic force and gets stuck in the gap between the rotator and the positioning tube, thereby restricting the rotation between the rotator and the positioning tube.

[0007] As a further improvement of this application, the sleeve is fixedly connected to the rotator.

[0008] As a further improvement of this application, the inner diameter of the end of the positioning tube connected to the rotator is larger than the inner diameter of other positions of the positioning tube.

[0009] As a further improvement of this application, a reinforcing sleeve is also provided on the outside of the end of the positioning tube that is connected to the rotator.

[0010] As a further improvement of this application, the elastic element is a free spring, and when the elastic element is in a free state, there is a gap between the limiting block and the inner wall of the positioning tube.

[0011] As a further improvement of this application, the mounting groove is divided into a larger receiving groove and a smaller locking groove. The width of the locking groove at the contact point with the receiving groove is greater than or equal to the thickness of the limiting block, and the width of the locking groove at the end away from the receiving groove is less than the thickness of the limiting block.

[0012] As a further improvement to this application, the limiting block has a spherical structure.

[0013] As a further improvement of this application, the first limiting rod is located on the side of the swing arm closer to the rear of the truck, and the vertical height of the first limiting rod is higher than the vertical height of the second limiting rod.

[0014] As a further improvement of this application, the distance between the first limiting rod and the sleeve is less than five centimeters.

[0015] The beneficial effects of this invention are: by swinging the swing arm and limiting the resistance spring, the magnitude of the initial impact force is reduced, thereby significantly reducing the force of the low-speed collision that causes damage to the following vehicle, thus protecting the following vehicle.

[0016] However, in the event of a high-speed collision, once the resistance spring is fully compressed, the second limit rod rigidly restricts the swing arm's movement, thus continuing to prevent the following vehicle from going under the preceding vehicle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a truck rear protection device according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a truck rear protection device according to an embodiment of the present invention, showing the cooperation between the positioning tube and the rotator;

[0020] Figure 3 This is a schematic diagram of the structure of a rotator for a truck rear protection device according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the transverse structure of a truck rear protection device according to an embodiment of the present invention, showing the cooperation between the positioning tube and the rotator.

[0022] The diagram is marked as follows:

[0023] 1. Mounting base; 2. Sleeve; 3. Swing arm; 4. Guardrail; 5. First limit rod; 6. Second limit rod; 7. Resistance spring; 8. Positioning tube; 9. Rotator; 10. Elastic element; 11. Limit block. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] like Figure 1-4 As shown, a truck rear protection device includes a mounting base 1 installed below the rear of the truck; a sleeve 2 installed on the mounting base 1; a swing arm 3 with its upper end fixedly connected to the sleeve 2; a guardrail 4 fixedly installed at the lower end of the swing arm 3; a first limiting rod 5 installed at the rear of the truck; a second limiting rod 6 installed at the rear of the truck; the first limiting rod 5 and the second limiting rod 6 are distributed on both sides of the swing arm 3, limiting the swing range of the swing arm 3; and a resistance spring 7 with its two ends connected to the truck and the swing arm 3 respectively.

[0027] By swinging the swing arm 3 and limiting it with the resistance spring 7, the magnitude of the initial impact force is reduced, thereby significantly weakening the damage to the following vehicle from a low-speed collision and protecting it. However, in the case of a high-speed collision, after the resistance spring 7 is fully compressed, the second limit rod 6 rigidly restricts the swing arm's swing, thus continuing to prevent the following vehicle from going under the preceding vehicle.

[0028] To further enhance protection for following vehicles in high-speed collisions, the truck rear protection device also includes a locking mechanism. This locking mechanism comprises a positioning tube 8 mounted on the mounting base 1, a rotator 9 mounted on the sleeve 2, and a centrifugal control unit mounted on the rotator 9. The rotator 9 is inserted into the positioning tube 8 with a clearance fit. The rotator 9 has a mounting groove, and the centrifugal control unit is located within this groove. The centrifugal control unit includes an elastic element 10 with one end located within the groove and a limiting block 11 at the free end of the elastic element 10. When stationary or rotating at a slow speed, the limiting block 11 is confined within the mounting groove by the elastic force, allowing the rotator 9 and the positioning tube 8 to rotate freely. When the rotational speed reaches or exceeds a preset speed, the limiting block 11 overcomes the elastic force under centrifugal force, locking into the gap between the rotator 9 and the positioning tube 8, thereby restricting the rotation between them.

[0029] To enhance structural strength, the sleeve 2 is fixedly connected to the rotator 9. Furthermore, the sleeve 2 and the rotator 9 are fixedly connected by welding.

[0030] To accommodate the larger diameter rotator 9 while reducing the volume of the positioning tube 8, the inner diameter of the end of the positioning tube 8 connected to the rotator 9 is larger than the inner diameter of other parts of the positioning tube 8. Similarly, the outer diameter of the end of the positioning tube 8 connected to the rotator 9 is larger than the outer diameter of other parts of the positioning tube 8.

[0031] To enhance the strength of the connection, a reinforcing sleeve is also provided on the outside of the end where the positioning tube 8 is connected to the rotator 9.

[0032] The elastic element 10 is a free spring. When the elastic element 10 is in a free state, there is a gap between the limiting block 11 and the inner wall of the positioning tube 8.

[0033] In order to facilitate the limiting, the mounting groove is divided into a larger receiving groove and a smaller locking groove. The width of the locking groove at the contact point with the receiving groove is greater than or equal to the thickness of the limiting block 11, and the width of the locking groove at the end away from the receiving groove is less than the thickness of the limiting block 11.

[0034] For smooth movement, the limiting block 11 has a spherical structure.

[0035] To prevent the first limiting rod 5 from prematurely contacting the vehicle behind, the first limiting rod 5 is located on the side of the swing arm 3 closer to the rear of the truck, and the vertical height of the first limiting rod 5 is higher than the vertical height of the second limiting rod 6. Furthermore, the distance between the first limiting rod 5 and the sleeve 2 is less than five centimeters.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0037] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A rear protective device for a truck, comprising a mounting base (1) installed below the rear of the truck, characterized in that, Also includes The sleeve (2) is installed on the mounting base (1); The upper end of the swing arm (3) is fixedly connected to the sleeve (2); The railing (4) is fixedly installed at the lower end of the swing arm (3); The first limit bar (5) is located at the rear of the truck; The second limit bar (6) is located at the rear of the truck; The first limiting rod (5) and the second limiting rod (6) are distributed on both sides of the swing arm (3) to limit the swing range of the swing arm (3); The resistance spring (7) is connected at both ends to the truck and the swing arm (3); The truck rear protection device also includes a locking mechanism, which includes a positioning tube (8) on the mounting base (1), a rotator (9) on the sleeve (2), and a centrifugal control unit on the rotator (9). The rotator (9) is inserted into the positioning tube (8), and the rotator (9) and the positioning tube (8) are in clearance fit. The rotator (9) is provided with an installation groove, and the centrifugal control unit is set in the installation groove. The centrifugal control unit includes an elastic element (10) with one end set in the installation groove and a limiting block (11) set at the free end of the elastic element (10). When stationary or rotating at a slow speed, the limiting block (11) is confined in the mounting groove under the action of elastic force, while the rotator (9) and the positioning tube (8) can rotate freely. When the rotation speed is too fast, under the action of centrifugal force, the limiting block (11) will overcome the elastic force and get stuck in the gap between the rotator (9) and the positioning tube (8), thereby restricting the rotation between the rotator (9) and the positioning tube (8).

2. The truck rear protection device according to claim 1, characterized in that, The sleeve (2) is fixedly connected to the rotator (9).

3. The truck rear protection device according to claim 1, characterized in that, The inner diameter of the end of the positioning tube (8) connected to the rotator (9) is larger than the inner diameter of the positioning tube (8) at other locations.

4. The truck rear protection device according to claim 1, characterized in that, The end of the positioning tube (8) connected to the rotator (9) is also covered with a reinforcing sleeve.

5. The truck rear protection device according to claim 1, characterized in that, The elastic element (10) is a free spring. When the elastic element (10) is in a free state, there is a gap between the limiting block (11) and the inner wall of the positioning tube (8).

6. The truck rear protection device according to claim 1, characterized in that, The mounting groove is divided into a larger receiving groove and a smaller locking groove. The width of the locking groove at the contact point with the receiving groove is greater than or equal to the thickness of the limiting block (11). The width of the locking groove at the end away from the receiving groove is less than the thickness of the limiting block (11).

7. The truck rear protection device according to claim 1, characterized in that, The limiting block (11) has a spherical structure.

8. The truck rear protection device according to claim 1, characterized in that, The first limiting rod (5) is located on the side of the swing arm (3) closer to the rear of the truck, and the vertical height of the first limiting rod (5) is higher than the vertical height of the second limiting rod (6).

9. The truck rear protection device according to claim 5, characterized in that, The distance between the first limiting rod (5) and the sleeve (2) is less than five centimeters.

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