Shock absorber mounting beam for automobile
By designing shock absorber mounting beams with multi-angle support structures, the problem of insufficient structural strength is solved, higher strength and stiffness are achieved, the stability and safety of the suspension system are ensured, and riding comfort and vehicle safety are improved.
Patent Information
- Application Number
- CN202422385784.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The structural strength of the existing shock absorber installation beams is insufficient, which affects the working efficiency of the shock absorber and thus threatens the stability and safety of the suspension system and the vehicle.
A shock absorber mounting beam structure is designed including hollow cross beams, first and second "U"-shaped support arms and fixed seats. The strength and stiffness are enhanced through multi-angle support and double fixing points, and stability is ensured by bolted connections. The support arms are movably connected to the hollow cross beam to adapt to different vehicle models and road conditions.
The overall strength and stiffness of the shock absorber mounting beam is improved, the stability and durability of the suspension system is ensured, the body bumps and vibration are reduced, and the ride comfort and vehicle safety are improved.
Smart Images

Figure CN223072254U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shock absorber brackets, and particularly relates to a shock absorber mounting beam for an automobile. Background Art
[0002] In the field of automotive engineering, the shock absorber mounting beam, as an indispensable part of the suspension system, plays a crucial role. It is carefully designed to firmly connect the shock absorber to the crossbeam or longitudinal beam of the vehicle, thus constructing an efficient shock absorption system. The shock absorber, as the core component within the suspension system, its performance directly relates to the vibration control and stability during vehicle driving. Among them, the shock absorber effectively reduces the bump caused by road unevenness by precisely regulating the spring rebound rate and vibration amplitude, creating a smoother and more comfortable driving environment for the driver and passengers.
[0003] However, during the design and implementation of the shock absorber mounting beam, as the direct support point of the shock absorber, its strength and stiffness directly determine whether the shock absorption effect can be fully exerted. Once the structural strength of the mounting beam is insufficient, it will not only affect the working efficiency of the shock absorber, but also potentially threaten the overall stability and safety of the entire suspension system and even the vehicle, thereby affecting driving comfort and safety.
[0004] In view of this, designing a shock absorber mounting beam with a more reasonable structure and more reliable strength has become the key to improving the performance of the automotive suspension system and enhancing driving safety. Summary of the Invention
[0005] The purpose of the utility model is to provide a shock absorber mounting beam for an automobile to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] A shock absorber mounting beam for an automobile includes a hollow crossbeam, and both ends of the hollow crossbeam are bent upward to form mounting parts; a fixing seat is connected to the top of the mounting parts, and a shock absorber is arranged inside the fixing seat; a first "U"-shaped support arm is arranged above the mounting parts, and the open ends of the first "U"-shaped support arm are respectively movably connected to both sides of the hollow crossbeam; a second "U"-shaped support arm is arranged below the mounting parts, and the open ends of the second "U"-shaped support arm are respectively movably connected to both sides of the hollow crossbeam; hub bearings are arranged at one end of the first "U"-shaped support arm and the second "U"-shaped support arm away from the mounting parts, and the hub bearings are respectively movably connected to the first "U"-shaped support arm and the second "U"-shaped support arm through connecting frames.
[0008] Preferably, the hollow cross beam includes an upper support plate, a lower support plate and two side plates, wherein the two long sides of the upper support plate and the lower support plate are respectively welded to the side plates; a first shaft hole is provided above the side plate, and a second shaft hole is provided below the side plate.
[0009] Preferably, the open end of the first "U" - shaped support arm is hinged to the first shaft hole through a first rotating shaft, and the open end of the second "U" - shaped support arm is hinged to the second shaft hole through a second rotating shaft.
[0010] Preferably, first bending edges are respectively provided at both ends of the upper support plate, and the first bending edges are arranged vertically; second bending edges are respectively provided at both ends of the lower support plate, and the second bending edges are arranged horizontally.
[0011] Preferably, the fixing seat is of a right - angle structure, and the vertical side of the fixing seat is fixedly connected to the first bending edge through bolts; a third bending edge is provided at the lower end of the vertical side of the fixing seat, and the third bending edge is arranged horizontally and is fixedly connected to the second bending edge through bolts.
[0012] Preferably, a support seat is provided inside the second "U" - shaped support arm, and a first mounting hole is provided on the support seat; a second mounting hole is provided in the middle of the horizontal side of the fixing seat, and the second mounting hole corresponds to the first mounting hole; the lower end of the shock absorber is fixedly connected to the first mounting hole, and the upper end of the shock absorber is fixedly connected to the second mounting hole.
[0013] Preferably, first reinforcing ribs are respectively extended and fixedly connected outward from the two long sides of the upper support plate, and second reinforcing ribs are respectively extended and fixedly connected outward from the two long sides of the lower support plate.
[0014] Preferably, a plurality of weight - reducing holes are provided in the middle of the upper support plate along its length direction.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model forms a multi-angle support structure through the first "U"-shaped support arm and the second "U"-shaped support arm, and with the hollow cross beam, effectively enhancing the overall strength and stiffness of the shock absorber mounting beam; this design enables the mounting beam to better resist the force transmission from the shock absorber, ensuring the stability and durability of the suspension system; the first "U"-shaped support arm and the second "U"-shaped support arm are movably connected to the hollow cross beam through a rotating shaft, which not only facilitates installation and maintenance, but also allows the angle of the support arm to be adjusted to a certain extent to adapt to the shock absorption requirements under different vehicle models or road conditions, improving the shock absorption effect; the fixing seat adopts a right-angle structure and is firmly connected to the bent edges at both ends of the hollow cross beam through bolts. At the same time, the shock absorber mounting holes are provided in the fixing seat to ensure the stable installation of the shock absorber, reduce vibration transmission, and enhance the riding comfort; the support seat provided on the inner side of the second "U"-shaped support arm and the first mounting hole opened thereon cooperate with the second mounting hole on the fixing seat, providing a double fixing point for the shock absorber, further enhancing the shock absorption effect and reducing the bumps and vibrations of the vehicle body during driving; by opening a number of weight-reducing holes on the upper support plate, not only the overall weight of the mounting beam is reduced, but also sufficient strength and stiffness are maintained, which helps to improve the fuel economy and handling performance of the vehicle; the optimization of the overall structure and the improvement of the strength ensure the stability of the shock absorber mounting beam under harsh working conditions, reducing the risk of damage to the suspension system due to insufficient strength of the mounting structure, thereby improving the driving safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the present utility model;
[0017] Figure 2 is a schematic structural diagram of the connection between the first "U"-shaped support arm and the second "U"-shaped support arm of the present utility model and the hollow cross beam;
[0018] Figure 3 is a schematic structural diagram of the connection between the upper support plate and the lower support plate of the present utility model and the fixing seat;
[0019] Figure 4 is Figure 3 an enlarged schematic diagram of the structure at the position A shown.
[0020] Wherein: 1, hollow cross beam; 101, upper support plate; 102, lower support plate; 103, side plate; 2, mounting part; 3, fixing seat; 4, shock absorber; 5, first "U"-shaped support arm; 6, second "U"-shaped support arm; 7, wheel hub bearing; 8, connecting frame; 9, first shaft hole; 10, second shaft hole; 11, first rotating shaft; 12, second rotating shaft; 13, first bent edge; 14, second bent edge; 15, third bent edge; 16, support seat; 17, first mounting hole; 18, second mounting hole; 19, first reinforcing rib; 20, second reinforcing rib; 21, weight-reducing hole. Detailed implementation mode
[0021] The following further elaborates on the present utility model in conjunction with the accompanying drawings.
[0022] Please refer to Figures 1 to 4 , for achieving the above object, the present utility model provides the following technical solutions:
[0023] A shock absorber mounting beam for an automobile, comprising a hollow cross beam 1, wherein both ends of the hollow cross beam 1 are bent upwards respectively to form mounting parts 2; a fixed seat 3 is connected to the top ends of the mounting parts 2, and a shock absorber 4 is arranged in the fixed seat 3; a first "U"-shaped support arm 5 is arranged above the mounting parts 2, and the open ends of the first "U"-shaped support arm 5 are respectively movably connected to both side edges of the hollow cross beam 1; a second "U"-shaped support arm 6 is arranged below the mounting parts 2, and the open ends of the second "U"-shaped support arm 6 are respectively movably connected to both side edges of the hollow cross beam 1; a wheel hub bearing 7 is arranged at one end of the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 away from the mounting parts 2, and the wheel hub bearing 7 is respectively movably connected to the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 through a connecting frame 8.
[0024] By manufacturing a hollow crossbeam 1 with sufficient strength and stiffness, where the hollow crossbeam 1 is made of a suitable metal material and fabricated through processes such as welding, casting, or forging; then the two ends of the hollow crossbeam 1 are processed to be bent upward respectively to form mounting parts 2, where the design of the mounting parts 2 needs to ensure that they can be firmly connected to the fixed seats 3 and withstand the forces from the shock absorbers 4; at the top of the mounting parts 2, fixed seats 3 are installed, where the design of the fixed seats 3 needs to match the shape of the mounting parts 2 and have sufficient strength and stiffness to support the shock absorbers 4, where the shock absorbers 4 are fixedly connected to the fixed seats 3 through bolts, nuts, or other fasteners to ensure that the shock absorbers 4 can work properly and effectively absorb vibrations; above the mounting parts 2, a first "U"-shaped support arm 5 is installed, where the open ends of the first "U"-shaped support arm 5 are connected to the two side edges of the hollow crossbeam 1 through a movable connection method to achieve a certain degree of freedom adjustment; the design of the first "U"-shaped support arm 5 needs to consider its supporting effect on the hollow crossbeam 1 and provide additional stability and stiffness for the shock absorbers 4; below the mounting parts 2, a second "U"-shaped support arm 6 is installed in a similar manner, where the open ends of the second "U"-shaped support arm 6 are also movably connected to the two side edges of the hollow crossbeam 1 to form a double support for the mounting parts 2; the addition of the second "U"-shaped support arm 6 further enhances the overall strength and stability of the mounting beam, helping to reduce vibrations and noise; at the ends of the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 far from the mounting parts 2, hub bearings 7 are installed, where the design of the hub bearings 7 needs to meet the load-bearing and rotation requirements during the driving of the vehicle; a connecting frame 8 is used to movably connect the hub bearings 7 to the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 respectively, where the design of the connecting frame 8 needs to ensure that the bearings can rotate flexibly and at the same time transmit the necessary forces and torques; after all components are installed, overall debugging and testing are carried out, which includes checking whether the connections between the components are firm and reliable, and whether the shock absorber 4 mounting beam can work properly and effectively absorb vibrations; through testing by simulating different road conditions and driving conditions, ensure that the performance of the shock absorber 4 mounting beam meets the design requirements and can provide a stable and comfortable driving experience for the vehicle.
[0025] Please refer to Figure 2 、 Figure 3 As an embodiment of the present utility model, referring to, the hollow crossbeam 1 includes an upper support plate 101, a lower support plate 102, and two side plates 103, where the two long side edges of the upper support plate 101 and the lower support plate 102 are respectively welded to the side plates 103; a first shaft hole 9 is opened above the side plates 103, and a second shaft hole 10 is opened below the side plates 103; the open ends of the first "U"-shaped support arm 5 are hinged to the first shaft hole 9 through a first rotating shaft 11, and the open ends of the second "U"-shaped support arm 6 are hinged to the second shaft hole 10 through a second rotating shaft 12.
[0026] In the above-described solution, a metal material with high strength, corrosion resistance and suitable for welding is selected as the material for the upper support plate 101, the lower support plate 102 and the side plate 103. According to the design requirements, plates with corresponding dimensions and shapes are prepared, and a cutting machine or laser cutting technology is used to cut the raw material into the shapes of the upper support plate 101, the lower support plate 102 and the two side plates 103; the edges of the cut plates are processed to ensure that their flatness and perpendicularity meet the welding requirements; by butt-welding the two long sides of the upper support plate 101 and the lower support plate 102 to the two side plates 103 respectively, the welding temperature, speed and welding quality need to be controlled during the welding process to ensure that the welds are firm and free of defects such as cracks and pores; after welding, the welds are polished and cleaned to improve the overall aesthetics and prevent corrosion; by respectively opening the first shaft hole 9 and the second shaft hole 10 above and below the two side plates 103, after processing, the first shaft hole 9 and the second shaft hole 10 are deburred and cleaned to facilitate subsequent installation and use; according to the design requirements, the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 are manufactured, so as to ensure that the opening dimensions and shapes of the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 match the side plates 103 of the hollow cross beam 1 to facilitate subsequent connection; by installing the first rotating shaft 11 in the first shaft hole 9, the two ends of the first rotating shaft 11 extend out of the first shaft hole 9 and are respectively fixedly connected to the open ends of the first "U"-shaped support arm 5, thereby realizing the hinge connection between the first "U"-shaped support arm 5 and the first shaft hole 9; similarly, the second rotating shaft 12 is installed in the second shaft hole 10, so that the two ends of the second rotating shaft 12 extend out of the second shaft hole 10 and are respectively fixedly connected to the open ends of the second "U"-shaped support arm 6, thereby realizing the hinge connection between the second "U"-shaped support arm 6 and the second shaft hole 10; after all connections are completed, the connection stability between the first "U"-shaped support arm 5 and the second "U"-shaped support arm 6 and the hollow cross beam 1 is checked, and if necessary, necessary adjustments or reinforcement treatments are carried out to ensure the reliability and safety of the connection; through the above specific work content, it is ensured that the shock absorber 4 installation beam has sufficient strength and stiffness to support the shock absorber 4 and withstand the impact force from the road surface, and at the same time provides the necessary flexibility and adjustment space to adapt to different vehicles and driving conditions.
[0027] Please refer to Figure 3 , Figure 4, as an embodiment of the present utility model, first bending edges 13 are respectively provided at both ends of the upper support plate 101, wherein the first bending edges 13 are vertically arranged, and second bending edges 14 are respectively provided at both ends of the lower support plate 102, wherein the second bending edges 14 are horizontally arranged; the fixing seat 3 is of a right-angle structure, and the vertical side of the fixing seat 3 is fixedly connected to the first bending edge 13 by bolts; a third bending edge 15 is provided at the lower end of the vertical side of the fixing seat 3, wherein the third bending edge 15 is horizontally arranged, and the third bending edge 15 is fixedly connected to the second bending edge 14 by bolts.
[0028] In the above-mentioned solution, both ends of the upper support plate 101 are bent according to the design requirements to form the first bending edges 13, and the first bending edges 13 need to be vertically arranged so as to be connected to the vertical side of the fixing seat 3; the bent first bending edges 13 are polished and cleaned to remove burrs and impurities, so as to improve the reliability and aesthetics of subsequent connections; both ends of the lower support plate 102 are also bent according to the design requirements to form the second bending edges 14, and the second bending edges 14 are horizontally arranged, and the bent second bending edges 14 are polished and cleaned to ensure a flat surface without defects; the fixing seat 3 is of a right-angle structure, and the fixing seat 3 should have sufficient strength and stiffness to support the shock absorber 4 and withstand the impact force from the road surface; the lower end of the vertical side of the fixing seat 3 is bent according to the design requirements to form the third bending edge 15; by aligning the third bending edge 15 of the fixing seat 3 with the second bending edge 14 of the lower support plate 102, it is ensured that the two are horizontally aligned and closely fitted; then bolts are used to fixedly connect the third bending edge 15 of the fixing seat 3 to the second bending edge 14; at the same time, the vertical side of the fixing seat 3 is aligned with the first bending edge 13 of the upper support plate 101 to ensure that the two are closely fitted; bolts are used to fixedly connect the vertical side of the fixing seat 3 to the first bending edge 13, and during the tightening process, it is necessary to ensure that the tightening torque of the bolts is appropriate to avoid problems caused by being too tight or too loose, so as to ensure the stability and reliability of the connection; after all connections are completed, the connection stability between the fixing seat 3 and the upper support plate 101 and the lower support plate 102 is checked, providing a solid foundation for the installation and subsequent use of the shock absorber 4, so as to ensure the reliability and safety of the connection.
[0029] Please refer to Figure 1 , Figure 2 , as an embodiment of the present utility model, a support seat 16 is provided inside the second "U" - shaped support arm 6, and a first mounting hole 17 is opened on the support seat 16; a second mounting hole 18 is opened in the middle of the horizontal side of the fixing seat 3, and the second mounting hole 18 corresponds to the first mounting hole 17; the lower end of the shock absorber 4 is fixedly connected to the first mounting hole 17, and the upper end of the shock absorber 4 is fixedly connected to the second mounting hole 18.
[0030] In the above-described solution, on the inner side of the second "U"-shaped support arm 6, a support seat 16 is designed and installed according to the installation requirements of the shock absorber 4. The support seat 16 should have sufficient strength and stiffness to support the weight of the shock absorber 4 and transmit the impact force from the road surface. The size and shape of the support seat 16 should ensure a tight fit with the inner side of the second "U"-shaped support arm 6 and provide sufficient space for the installation of the shock absorber 4. On the support seat 16, a first mounting hole 17 is precisely drilled according to the fixing method of the lower end of the shock absorber 4. The position and size of the first mounting hole 17 should meet the installation requirements of the shock absorber 4. At the middle position of the horizontal side of the fixing seat 3, a second mounting hole 18 is drilled according to the fixing method of the upper end of the shock absorber 4. The second mounting hole 18 should correspond to the first mounting hole 17 to ensure that the shock absorber 4 can be accurately installed and fixed between the two first mounting holes 17 and the second mounting hole 18. Align the lower end of the shock absorber 4 with the first mounting hole 17 on the support seat 16 and use appropriate fasteners to fixedly connect the lower end of the shock absorber 4 to the support seat 16. Then, align the upper end of the shock absorber 4 with the second mounting hole 18 on the fixing seat 3 and use corresponding fasteners to fixedly connect the upper end of the shock absorber 4 to the fixing seat 3. After the installation of the shock absorber 4 is completed, check the connection stability to ensure that the shock absorber 4 can be stably installed on the hollow cross beam 1 and can effectively absorb and mitigate the impact force from the road surface during vehicle driving.
[0031] Please refer to Figure 3 、 Figure 4 As an embodiment of the present invention, first reinforcing ribs 19 are respectively extended and fixedly connected outward from the two long sides of the upper support plate 101, and second reinforcing ribs 20 are respectively extended and fixedly connected outward from the two long sides of the lower support plate 102. A plurality of weight-reducing holes 21 are formed along the length direction in the middle of the upper support plate 101.
[0032] In the above-described solution, the two long sides of the upper support plate 101 respectively extend outward by a certain length, and the specific length is determined according to the design requirements, so as to install the first reinforcing rib 19. The first reinforcing rib 19 is firmly fixed on the extended part of the upper support plate 101 by using a welding fixation method, ensuring a stable connection between the first reinforcing rib 19 and the upper support plate 101 to improve the strength and stiffness of the overall structure. After the installation of the first reinforcing rib 19 is completed, a quality inspection is carried out on the upper support plate 101. Similar to the upper support plate 101, according to the strength and stiffness requirements of the lower support plate 102, the shape and size of the second reinforcing rib 20 are designed to ensure that the second reinforcing rib 20 can effectively improve the load-bearing capacity and stability of the lower support plate 102. The second reinforcing rib 20 is firmly fixed on the extended part of the lower support plate 102 by using the same welding method as the upper support plate 101, ensuring a stable connection between the second reinforcing rib 20 and the lower support plate 102. In order to reduce the weight of the upper support plate 101 and save materials, while not affecting its load-bearing capacity and structural stability, a number of weight-reducing holes 21 are designed along the length direction in the middle of the upper support plate 101. The shape, size and distribution of these weight-reducing holes 21 should be accurately calculated and optimally designed. During the opening process, it should be ensured that the accuracy and quality of the holes meet the design requirements to avoid adverse effects on the overall structure of the upper support plate 101. After the weight-reducing holes 21 are opened, necessary surface treatments are carried out on the upper support plate 101, such as removing burrs and cleaning the hole edges, etc., to improve the aesthetics and service performance of the upper support plate 101. Through the above specific work contents, the installation of the reinforcing ribs of the upper support plate 101 and the lower support plate 102 and the opening of the weight-reducing holes 21 of the upper support plate 101 are completed. These designs not only improve the load-bearing capacity and stability of the hollow cross beam 1, but also reduce the overall weight and save materials. At the same time, through strict quality inspection and control measures, it is ensured that the quality and performance of the hollow cross beam 1 meet the design requirements.
[0033] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that these are only examples. The protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A shock absorber mounting beam for an automobile, comprising a hollow cross beam (1), wherein mounting parts (2) are formed by bending both ends of the hollow cross beam (1) upward; characterized in that, The top of the installation part (2) is connected with a fixing seat (3), and a shock absorber (4) is arranged in the fixing seat (3); above the installation part (2), there is a first "U"-shaped support arm (5), and the open ends of the first "U"-shaped support arm (5) are respectively movably connected with both sides of the hollow cross beam (1); below the installation part (2), there is a second "U"-shaped support arm (6), and the open ends of the second "U"-shaped support arm (6) are respectively movably connected with both sides of the hollow cross beam (1); at one end of the first "U"-shaped support arm (5) and the second "U"-shaped support arm (6) away from the installation part (2), there is a hub bearing (7), and the hub bearing (7) is respectively movably connected with the first "U"-shaped support arm (5) and the second "U"-shaped support arm (6) through a connecting frame (8).
2. The shock absorber mounting beam for an automobile according to claim 1, characterized in that, The hollow cross beam (1) includes an upper support plate (101), a lower support plate (102) and two side plates (103), and the two long sides of the upper support plate (101) and the lower support plate (102) are respectively welded to the side plates (103); a first shaft hole (9) is opened above the side plate (103), and a second shaft hole (10) is opened below the side plate (103).
3. The shock absorber mounting beam for a vehicle according to claim 1, characterized in that, The open end of the first "U"-shaped support arm (5) is hinged to the first shaft hole (9) through a first rotating shaft (11), and the open end of the second "U"-shaped support arm (6) is hinged to the second shaft hole (10) through a second rotating shaft (12).
4. The shock absorber mounting beam for an automobile according to claim 2, characterized in that, Both ends of the upper support plate (101) are respectively provided with first bent edges (13), and the first bent edges (13) are vertically arranged. Both ends of the lower support plate (102) are respectively provided with second bent edges (14), and the second bent edges (14) are horizontally arranged.
5. The shock absorber mounting beam for an automobile according to claim 1, wherein, The fixing seat (3) is of a right-angle structure, and the vertical side of the fixing seat (3) is fixedly connected with the first bent edge (13) through a bolt; a third bent edge (15) is arranged at the lower end of the vertical side of the fixing seat (3), and the third bent edge (15) is horizontally arranged, and the third bent edge (15) is fixedly connected with the second bent edge (14) through a bolt.
6. The shock absorber mounting beam for a vehicle according to claim 1, characterized in that, A support seat (16) is arranged inside the second "U"-shaped support arm (6), and a first installation hole (17) is opened on the support seat (16); a second installation hole (18) is opened in the middle of the horizontal side of the fixing seat (3), and the second installation hole (18) corresponds to the first installation hole (17); the lower end of the shock absorber (4) is fixedly connected with the first installation hole (17), and the upper end of the shock absorber (4) is fixedly connected with the second installation hole (18).
7. The shock absorber mounting beam for an automobile according to claim 2, characterized in that, Both long sides of the upper support plate (101) respectively extend outwards and are fixedly connected with first reinforcing ribs (19), and both long sides of the lower support plate (102) respectively extend outwards and are fixedly connected with second reinforcing ribs (20).
8. The shock absorber mounting beam for an automobile according to claim 7, characterized in that, A plurality of weight-reducing holes (21) are opened in the middle of the upper support plate (101) along its length direction.