A rear underbody towing hook structure
By combining a U-shaped tube beam, a split bracket, and a Z-shaped bracket, the problem of easy deformation of the rear crossbeam of the traditional automobile rear tow hook structure under high tensile conditions is solved, achieving high strength and lightweight of the tow hook structure and avoiding safety hazards.
Patent Information
- Application Number
- CN202522730637.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-12-23
AI Technical Summary
When the traditional rear tow hook structure of a car is subjected to a tensile force of more than twice the weight of the vehicle, the rear crossbeam is prone to crushing and deformation, posing a safety hazard.
The system employs a combination structure of U-shaped tube beams, split-type supports, and Z-shaped supports. The traction rope is directly tied to the U-shaped tube beams, the split-type supports are fixedly connected to the rear main beam and the rear crossbeam, and the Z-shaped supports form a closed cavity force transmission structure within the rear crossbeam cavity, dispersing the traction force and avoiding local deformation.
It improves the tensile strength and durability of the traction hook structure, prevents significant crushing and deformation of the rear crossbeam, and makes the structure lightweight and cost-effective.
Smart Images
Figure CN224940898U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle frame structure technology, and in particular to a rear underbody towing hook structure. Background Technology
[0002] With the continuous expansion of the automobile export market, many countries and regions have put forward clear regulatory requirements for rear towing devices, requiring the installation of tow hook structures that meet specific strength standards in the lower rear of the vehicle. Traditional automobile rear tow hooks generally adopt a through-type arrangement, such as a typical structure disclosed in existing technology, which includes components such as the tow hook body, tow hook bracket, rear tow hook sleeve, rear end beam, and rear end beam inner plate. In this structure, the tow hook body needs to pass vertically through the rear bumper skin and connect to the sleeve bracket inside the vehicle body through the tow hook nut rod. The traction force is diffused through the tow hook bracket to the rear end beam and its inner plate, thereby realizing the transmission of traction force.
[0003] In practice, there are bottlenecks in structural strength. The connection between the towing hook bracket and the rear crossbeam is usually achieved by single-point or partial planar bonding. When subjected to tensile forces more than twice the weight of the vehicle, the cavity of the rear crossbeam is prone to crushing and deformation, which can lead to instability of the towing hook mounting point or even structural failure, posing a safety hazard. Utility Model Content
[0004] The purpose of this utility model is to provide a rear underbody towing hook structure to solve the technical problems in the prior art. It can meet the pulling performance requirements of more than twice the weight of the whole vehicle, and can also disperse the traction force to prevent the rear crossbeam from being significantly crushed and deformed. Moreover, it requires less local modification and saves more costs.
[0005] This utility model provides a rear underbody towing hook structure, including: The traction hook assembly, the main body of which is a U-shaped tube beam, is used to directly bind the traction rope; The split-type support includes two independent supports, left and right, which are respectively connected to the two side arms of the U-shaped tube beam; The rear crossbeam is located at the rear of the vehicle. The rear beams are located on both sides at the rear of the vehicle; A Z-shaped bracket is installed inside the cavity of the rear crossbeam; The split-type bracket is fixedly connected to the rear beam and the rear crossbeam; the U-shaped bracket is connected to the split-type bracket, the rear crossbeam and the rear anti-collision beam respectively, and the U-shaped bracket forms a closed cavity force transmission structure in the cavity of the rear crossbeam.
[0006] In the rear undercarriage towing hook structure described above, preferably, the U-shaped tube beam is a hollow tubular structure with a constant or variable cross-section, and the cross-section of the U-shaped tube beam is circular, elliptical, or rectangular.
[0007] In the rear undercarriage towing hook structure described above, preferably, the two ends of the U-shaped tube beam are provided with outward or inward flanges, which are used to overlap with the split bracket.
[0008] In the rear undercarriage towing hook structure described above, preferably, the bottom of the U-shaped tube beam is provided with an arc-shaped section, and the arc-shaped section is provided with a line-passing notch or a towing rope positioning groove.
[0009] In the rear underbody towing hook structure described above, preferably, the split bracket includes a first bracket and a second bracket, both of which include: The first lap joint surface is connected to the outer surface of the side arm of the U-shaped tube beam; The second lap surface is connected to the inner side or lower surface of the rear beam; The third lap joint is connected to the end face or lower surface of the rear crossbeam.
[0010] In the rear underbody towing hook structure described above, preferably, positioning holes or positioning flanges are provided on the first overlapping surface, the second overlapping surface and the third overlapping surface, and weight reduction holes and reinforcing ribs are provided on the first bracket and the second bracket.
[0011] The rear undercarriage towing hook structure described above preferably further includes a reinforcing plate, which overlaps at the connection between one of the split brackets and the U-shaped tube beam, and the cross-section of the reinforcing plate is triangular or trapezoidal.
[0012] The rear undercarriage towing hook structure described above preferably further includes a support plate, which is inclined and located at the rear end of the U-shaped tube beam. The support plate, the U-shaped tube beam, and the corresponding split bracket form a triangular reinforcement structure. The support plate is provided with a flange and a reinforcing groove.
[0013] In the rear underbody towing hook structure described above, preferably, the U-shaped bracket includes: The top plate is in contact with the top surface of the inner cavity of the rear crossbeam; The two side plates are respectively fitted to the inner cavity side of the rear crossbeam; The front flange is connected to the split-type bracket; The rear flap is connected to the rear anti-collision beam.
[0014] In the rear undercarriage towing hook structure described above, preferably, the U-shaped bracket is connected to the rear crossbeam, the split bracket, and the rear anti-collision beam by welding or riveting, and the U-shaped bracket forms a closed force transmission cavity with the rear crossbeam, the split bracket, and the rear anti-collision beam.
[0015] Compared with the prior art, this utility model eliminates the need for traditional stud connecting rods by tying ropes to the U-shaped tube beam, effectively avoiding defects such as stripping and damage to the paint film, thus promoting corrosion prevention. The traction force is distributed to the rear beam and rear crossbeam through the reinforcement of the U-shaped tube beam, reinforcing plate, split bracket, and inclined support plate, while preventing significant crushing and deformation of the rear crossbeam. The split bracket adopts a left and right split structure, which is convenient for stamping and forming. Attached Figure Description
[0016] Figure 1 This is a perspective view of the traction hook assembly provided in the embodiments of this application.
[0017] Figure 2 This is a perspective view of the connection between the traction hook assembly and the rear beam and rear crossbeam provided in the embodiments of this application.
[0018] Figure 3 This is a perspective view of the rear undercarriage towing hook structure provided in the embodiments of this application.
[0019] Explanation of reference numerals in the attached figures: 1-First bracket, 101-First overlapping surface, 102-Second overlapping surface, 103-Third overlapping surface, 104-Positioning hole, 105-Positioning flange, 106-Weight reduction hole, 107-Reinforcing rib; 2-Second bracket, 3-U-shaped tube beam, 4-Reinforcing plate, 5-Support plate, 6-Rear beam, 7-Rear crossbeam, 8-Z-shaped bracket, 9-Rear anti-collision beam. Detailed Implementation
[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0021] like Figures 1 to 3As shown, an embodiment of this utility model provides a rear underbody towing hook structure, including: a towing hook assembly, the main body of which is a U-shaped tube beam 3, used to directly bind the towing rope; a split bracket, including two independent brackets on the left and right, which are respectively connected to the two side arms of the U-shaped tube beam 3; a rear crossbeam 7, located at the rear of the vehicle; a rear main beam 6, located on both sides of the rear of the vehicle; and a Z-shaped bracket 8, which is set in the cavity of the rear crossbeam 7; wherein, the split bracket is fixedly connected to the rear main beam 6 and the rear crossbeam 7; the Z-shaped bracket 8 is connected to the split bracket, the rear crossbeam 7 and the rear anti-collision beam 9 respectively, and the Z-shaped bracket 8 forms a closed cavity force transmission structure in the cavity of the rear crossbeam 7.
[0022] The towing hook assembly uses a U-shaped tubular beam, allowing the rope to wrap directly around the bottom of the U-shaped tubular beam 3, resulting in even force distribution and preventing slippage. Compared to traditional solid hooks, this hollow tubular beam is both lightweight and sturdy. The split-type bracket uses two independent brackets, one on each side, to hold the two side arms of the U-shaped tubular beam 3 like "clamps." This solves the problem of traditional structures being large and heavy while ensuring precision and strength. It is relatively simple to manufacture, with each independent bracket having a simple structure, easy mold making, and flexible installation. Even if damaged, only one side needs to be replaced, preventing the entire structure from being scrapped. The rear crossbeam 7 and rear main beam 6 are the basic components of the vehicle body, and the towing hook assembly is assembled on the rear crossbeam 7 and rear main beam 6. This design not only saves space but also materials. The Z-shaped bracket 8 is hidden inside the cavity of the rear crossbeam 7, providing support. When the U-shaped tube beam 3 is subjected to force, the force is transmitted to the rear crossbeam 7 through the split bracket. The Z-shaped bracket 8 increases the strength of the rear crossbeam 7, transforming the potentially deformable open space into a closed force-transmitting cavity. This disperses the impact force throughout the entire cavity structure, rather than concentrating it on a few welding points, greatly improving tensile strength and durability. Moreover, it connects the split bracket, the rear crossbeam 7, and the rear anti-collision beam 9, binding the three together to form a "community of shared destiny." If any one of them is subjected to force, the other two can disperse the impact force.
[0023] In the embodiments provided in this application, reference is made to Figure 1 as well as Figure 3 As shown, the U-shaped tube beam 3 is a hollow tubular structure with a constant or variable cross-section, and the cross-section of the U-shaped tube beam 3 is circular, elliptical or rectangular. The two ends of the U-shaped tube beam 3 are provided with outward or inward flanges, which are used to overlap with the split bracket. The bottom of the U-shaped tube beam 3 is provided with an arc section, and the arc section is provided with a wire passing notch or a traction rope positioning groove. The U-shaped tube beam 3 is arranged below the lower edge of the rear bumper of the vehicle and extends out after passing under the vehicle.
[0024] The hollow design of the U-shaped tube beam 3 contributes to weight reduction. The round tube is inexpensive, the elliptical tube better conforms to the body lines, and the rectangular tube increases the welding surface and improves the connection strength of the structure. The outer and inner flanges expand the contact area and improve the welding strength, making the weld longer and stronger when the split brackets are welded on the flanged plane. The arc section at the bottom of the U-shaped tube beam 3 can avoid excessive local stress on the rope, and the line notch and positioning groove can prevent the rope from slipping. The U-shaped tube beam 3 extends from the lower edge of the bumper, which does not affect the aesthetics or the performance of the bumper.
[0025] In the embodiments provided in this application, reference is made to Figure 1 As shown, the split-type support includes a first support 1 and a second support 2. Both the first support 1 and the second support 2 include: a first overlapping surface 101, which is connected to the outer surface of the side arm of the U-shaped tube beam 3; a second overlapping surface 102, which is connected to the inner side or lower surface of the rear beam 6; and a third overlapping surface 103, which is connected to the end face or lower surface of the rear crossbeam 7. The first overlapping surface 101, the second overlapping surface 102 and the third overlapping surface 103 are all provided with positioning holes 104 or positioning flanges 105. The first support 1 and the second support 2 are both provided with weight reduction holes 106 and reinforcing ribs 107.
[0026] The first lap surface 101, the second lap surface 102, and the third lap surface 103 can increase the contact area with the U-shaped tube beam 3, the rear main beam 6, and the rear crossbeam 7. When the U-shaped tube beam 3 is under stress, the force is transmitted to the rear main beam 6 and the rear crossbeam 7, realizing one-to-many force transmission and avoiding single-point overload. The positioning hole 104 and the positioning flange 105 can improve the accuracy and efficiency of structural assembly. Assembly can be completed quickly by hole-to-hole and edge-to-edge. The weight reduction hole 106 is to reduce the weight of the split bracket, and the reinforcing rib 107 is to improve the strength of the split bracket. While ensuring the structural lightweight, the structural strength is also guaranteed, achieving a perfect balance between lightweight and strength.
[0027] In the embodiments provided in this application, reference is made to Figure 1 As shown, it also includes a reinforcing plate 4, which overlaps at the connection between one of the split brackets and the U-shaped tube beam 3. The cross-section of the reinforcing plate 4 is triangular or trapezoidal.
[0028] The reinforcing plate 4 is installed at the angle between the split bracket and the U-shaped tube beam 3 on one side because when the U-shaped tube beam 3 is under force, it will pull the split bracket backward. This force will generate a large shear stress at the angle between the split bracket and the U-shaped tube beam 3, affecting its strength. The cross-section of the reinforcing plate 4 is made into a triangle or trapezoid, which fills this angle and forms a corner brace. For example, by utilizing the stability of the triangular structure, the shear force that was originally concentrated on a weld is distributed to a surface, ensuring the strength of the structure without increasing the overall weight.
[0029] In the embodiments provided in this application, reference is made to Figure 1 As shown, it also includes a support plate 5, which is inclined and located at the rear end of the U-shaped tube beam 3. The support plate 5, the U-shaped tube beam 3 and the corresponding split bracket form a triangular reinforcement structure. The support plate 5 is provided with a flange and a reinforcing groove.
[0030] The support plate 5 is inclined and supported between the rear end of the U-shaped tube beam 3 and the split bracket. The three together form a triangle. When pulled, the U-shaped tube beam 3 tends to move backward. The support plate 5 can support the U-shaped tube beam 3, transforming the bending stress that might have been generated into tensile and compressive stress along the direction of the support plate 5. Moreover, the triangle hardly deforms, thereby improving the rigidity of the entire structure. The flange is used to increase the bending resistance of the support plate 5, and the reinforcing groove improves the rigidity through the ridge line without increasing the thickness and mass of the support plate 5.
[0031] Furthermore, referring to Figure 3 As shown, the Z-shaped bracket 8 includes: a top plate that fits against the top surface of the inner cavity of the rear crossbeam 7; two side plates that fit against the sides of the inner cavity of the rear crossbeam 7 respectively; a front flange that connects to the split bracket; and a rear flange that connects to the rear anti-collision beam 9.
[0032] When the rear crossbeam 7 is subjected to a large external force, the top and side plates of the Z-shaped bracket 8 can support the cavity of the rear crossbeam 7 to prevent it from deforming. Compared with simply increasing the thickness of the crossbeam steel plate, this is more efficient and the material utilization rate is relatively high. The front flange is welded to the split bracket, and the rear flange is connected to the rear anti-collision beam 9, connecting the U-shaped tube beam 3 and the anti-collision system in series. Under normal stress, part of the force can be transferred to the rear anti-collision beam 9 through the Z-shaped bracket 8. Conversely, when the rear anti-collision beam 9 is impacted, the force can also be transmitted to the rear beam 6 and the split bracket through the Z-shaped bracket 8, thereby avoiding local tearing of the rear anti-collision beam 9 and greatly improving the integration and overall rigidity of the entire rear of the vehicle.
[0033] In the embodiments provided in this application, reference is made to Figure 3As shown, the Z-shaped bracket 8 is connected to the rear crossbeam 7, the split bracket and the rear anti-collision beam 9 by welding or riveting, and the Z-shaped bracket 8 forms a closed force transmission cavity with the rear crossbeam 7, the split bracket and the rear anti-collision beam 9.
[0034] The Z-shaped bracket 8 is located inside the rear crossbeam 7, dividing the hollow part inside the rear crossbeam 7 into several small cavities. The boundary of each cavity is formed by the Z-shaped bracket 8, the wall of the rear crossbeam 7, the split bracket, and the rear anti-collision beam 9. The force is contained within a relatively closed cavity throughout the process, which not only has extremely high rigidity but also extremely light weight and the shortest force transmission path.
[0035] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.
Claims
1. A rear underbody towing hook structure, characterized in that, include: The traction hook assembly, the main body of which is a U-shaped tube beam, is used to directly bind the traction rope; The split-type support includes two independent supports, left and right, which are respectively connected to the two side arms of the U-shaped tube beam; The rear crossbeam is located at the rear of the vehicle. The rear beams are located on both sides at the rear of the vehicle; A Z-shaped bracket is installed inside the cavity of the rear crossbeam; The split-type bracket is fixedly connected to the rear beam and the rear crossbeam; the U-shaped bracket is connected to the split-type bracket, the rear crossbeam and the rear anti-collision beam respectively, and the U-shaped bracket forms a closed cavity force transmission structure in the cavity of the rear crossbeam.
2. The rear undercarriage towing hook structure according to claim 1, characterized in that: The U-shaped tube beam is a hollow tubular structure with a constant or variable cross-section, and the cross-section of the U-shaped tube beam is circular, elliptical, or rectangular.
3. The rear undercarriage towing hook structure according to claim 2, characterized in that: The two ends of the U-shaped tube beam are provided with outward or inward flanges, which are used to overlap with the split-type support.
4. The rear undercarriage towing hook structure according to claim 2, characterized in that: The bottom of the U-shaped tube beam is provided with an arc-shaped section, and the arc-shaped section is provided with a wire passage notch or a traction rope positioning groove.
5. The rear undercarriage towing hook structure according to claim 1, characterized in that: The split-type support includes a first support and a second support, and both the first support and the second support include: The first lap joint surface is connected to the outer surface of the side arm of the U-shaped tube beam; The second lap surface is connected to the inner side or lower surface of the rear beam; The third lap joint is connected to the end face or lower surface of the rear crossbeam.
6. The rear undercarriage towing hook structure according to claim 5, characterized in that: Positioning holes or positioning flanges are provided on the first, second, and third overlapping surfaces, and weight-reducing holes and reinforcing ribs are provided on the first and second brackets.
7. The rear undercarriage towing hook structure according to claim 1, characterized in that: It also includes a reinforcing plate, which overlaps at the connection between one of the split brackets and the U-shaped tube beam, and the cross-section of the reinforcing plate is triangular or trapezoidal.
8. The rear undercarriage towing hook structure according to claim 1, characterized in that: It also includes a support plate, which is inclined and located at the rear end of the U-shaped tube beam. The support plate, the U-shaped tube beam and the corresponding split bracket form a triangular reinforcement structure. The support plate is provided with a flange and a reinforcing groove.
9. The rear undercarriage towing hook structure according to claim 1, characterized in that: The zig-shaped support includes: The top plate is in contact with the top surface of the inner cavity of the rear crossbeam; The two side plates are respectively attached to the inner cavity side of the rear crossbeam; The front flange is connected to the split-type bracket; The rear flap is connected to the rear anti-collision beam.
10. The rear undercarriage towing hook structure according to claim 9, characterized in that, The U-shaped bracket is connected to the rear crossbeam, the split bracket and the rear anti-collision beam by welding or riveting, and the U-shaped bracket forms a closed force transmission cavity with the rear crossbeam, the split bracket and the rear anti-collision beam.