Mounting structure and mounting method of vehicle body integrated suspension

Abstract

The invention discloses a mounting structure and a mounting method of a vehicle body integrated suspension, the mounting structure comprises a suspension and a limiting structure, the suspension comprises a suspension main spring and a suspension support arm, and the suspension main spring and the suspension support arm are vulcanized into an integrated structure; the limiting structure is located on the edge, where a damping tower is installed, of the upper surface of a longitudinal beam of a vehicle body, the limiting structure and the longitudinal beam of the vehicle body are of an integrated structure, the limiting structure is a frame with a rectangular space, a suspension is installed in the rectangular space of the frame to limit the suspension, and the suspension is integrated in the frame of the longitudinal beam of the vehicle body; according to the mounting structure of the vehicle body integrated suspension, by making features on the vehicle body, the limiting function is achieved, the Y-direction space and the X-direction space are released, a shock absorption tower can be made stronger, the strength and rigidity of the shock absorption tower are improved, and the vibration absorption performance of the whole vehicle is improved; meanwhile, mounting points on the suspension and the longitudinal beam are omitted, a crumple area for collision safety is enlarged, and the collision safety of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the design of the structure of a mounting assembly, and particularly relates to an installation structure and an installation method for an integrated body mount. Background Art

[0002] Currently, the automotive industry is booming, and new energy vehicles are leading the trend in the international market. New models of various vehicle manufacturers are successively released. In order to reduce R & D costs, major automobile companies attach great importance to platform development. The same platform includes models such as SUV / MPV / A / B, etc., and takes into account different requirements such as comfort type / cross-country type, etc. This requires that when developing parts, the maximum movement envelope should be considered, because this situation also leads to a very narrow layout space for the mounts, and the dynamic stiffness of the shock tower is insufficient.

[0003] The function of the engine mount is to reduce and control the transmission of engine vibration and to support the automotive powertrain components. The existing mount structure is as Figure 1 shown, including a mount main spring 1, a mount bracket 2, and a mount trailing arm 3. The mount main spring 1 is located inside the mount bracket 2. There are three bolt holes provided on the mount bracket 2. The two bolt holes at the bottom are connected to the longitudinal beam through bolts, and the bolt hole at the top is connected to the shock tower through bolts. The mount bracket 2 plays a role in limiting and fixing the mount main spring 1. The mount main spring 1 is connected to the mount trailing arm 3, and the mount trailing arm 3 is connected to the engine to provide support for the engine. The existing mount assembly is installed on the longitudinal beam and the shock tower as a single component. Since a plurality of bolt holes need to be provided on the mount bracket to realize the installation of the mount bracket, the entire mount bracket occupies a relatively large space in both the X - direction and the Y - direction. Due to space limitations, the structure of the mount main spring is made relatively small, and the vibration isolation performance is poor; in addition, there is no space for the shock tower to be strengthened, resulting in a relatively low dynamic stiffness of the whole vehicle and poor vibration absorption performance. Summary of the Invention

[0004] The purpose of the present invention is to provide an installation structure and an installation method for an integrated body mount, which can solve the problems of insufficient layout space and insufficient dynamic stiffness of the shock tower, and realize the improvement of the dynamic stiffness of the shock tower, thereby improving the NVH performance of the whole vehicle.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides an installation structure for an integrated body mount, including a mount and a limiting structure. The mount includes a mount main spring and a mount trailing arm, and the mount main spring and the mount trailing arm are vulcanized into an integral structure; the limiting structure is located at the edge of the upper surface of the vehicle body longitudinal beam where the shock tower is installed, and is an integral structure with the vehicle body longitudinal beam. The limiting structure is a frame with a rectangular space, and the mount is installed in the rectangular space of the frame to limit the mount, so that the mount is integrated into the frame of the vehicle body longitudinal beam.

[0007] As a further technical solution, a sheet metal bracket is arranged on the inner wall surface of the frame. The size of the sheet metal bracket is smaller than that of the frame, and the sheet metal bracket is connected to the frame by a plurality of riveting bolts.

[0008] As a further technical solution, grooves and threaded holes are arranged at the bottom of the sheet metal bracket, and the size of the grooves matches the size of the base of the main suspension spring.

[0009] As a further technical solution, a clearance fit is adopted between the sheet metal bracket and the main suspension spring, and the assembly is fixed by bottom bolts. The bolts sequentially pass through the threaded holes on the upper surface of the vehicle body longitudinal beam, the threaded holes at the bottom of the sheet metal bracket, and the threaded holes of the main suspension spring base to fix the main suspension spring.

[0010] As a further technical solution, the corners of the sheet metal bracket are transitioned with rounded corners.

[0011] As a further technical solution, a suspension flow channel is arranged in the main suspension spring, and the suspension flow channel is filled with damping fluid.

[0012] As a further technical solution, the size of the main suspension spring cavity is greater than 80 mm, the damping angle is greater than 40°, and the X-direction limit length is greater than 12 mm.

[0013] In a second aspect, an embodiment of the present invention provides an installation method for an installation structure of an integrated vehicle body suspension, including the following steps:

[0014] First, vulcanize the support arm and the rubber together to obtain a main suspension spring with a support arm;

[0015] Then, assemble the flow channel system into the main suspension spring and fill the flow channel system with damping fluid;

[0016] Next, install the sheet metal bracket into the limit structure on the vehicle body longitudinal beam;

[0017] Finally, assemble the main suspension spring into the limit structure on the vehicle body longitudinal beam, tighten and fix it with bolts, and use the sheet metal bracket to limit and support the main suspension spring to realize integrating the suspension on the vehicle body.

[0018] As a further technical solution, when tightening and fixing the main suspension spring with bolts, the tightening torque is 110 ± 11 N·m and is marked with a diagonal line.

[0019] As a further technical solution, when installing the sheet metal bracket, select sheet metal brackets with different thicknesses for installation according to the need of the limit distance.

[0020] The beneficial effects of the above embodiments of the present invention are as follows:

[0021] The installation structure of the body integrated mount provided by the present invention, when the layout space is insufficient, cancels the mount bracket, installs the main spring of the mount on the vehicle body, and achieves the limiting function by making features on the vehicle body, releasing the Y-direction and X-direction spaces, enabling the shock tower to be made stronger, improving the strength and stiffness of the shock tower itself, and enhancing the vibration absorption performance of the whole vehicle; at the same time, cancels the installation points of the mount on the longitudinal beam, increases the crush zone for collision safety, and improves the collision safety of the whole vehicle.

[0022] The installation structure of the body integrated mount provided by the present invention, the sheet metal bracket is riveted to the limiting structure, improving the dynamic stiffness on the vehicle body side and enhancing the NVH performance of the whole vehicle. At the same time, large round corners are used at the four sides of the sheet metal bracket for easy assembly with the shock tower. During the adjustment of the whole vehicle, the limiting distance can be adjusted by adjusting the thickness of the sheet metal bracket, which is beneficial to the adjustment of the whole vehicle and is easy to achieve in batches.

[0023] The installation structure of the body integrated mount provided by the present invention, the main spring of the mount and the mount bracket are usually assembled with an interference fit. In the present invention, a clearance fit is adopted and assembled by fixing with bottom bolts. The number of assembly bolts in the general assembly workshop is reduced from three to one, improving the assembly efficiency of the production line; the diameter of the conventional main spring cavity is 60 mm and the damping angle > 35°. The diameter of the main spring cavity structure of the present invention can reach 80 mm and the damping angle > 40°. The length of the X-direction limiting block of the conventional main spring is about 12 mm. The length of the X-direction limiting block of the main spring of the present invention can reach 15 mm, which can reduce the X-direction dynamic-static ratio during acceleration and enhance the comfort of the whole vehicle during the acceleration condition.

[0024] The installation method of the body integrated mount provided by the present invention integrates the mount on the vehicle body instead of installing it as a separate component, which can solve the problems of insufficient layout space and insufficient dynamic stiffness of the shock tower, realize the improvement of the dynamic stiffness of the shock tower, and further enhance the NVH performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 is a schematic structural diagram of an existing engine mount;

[0027] Figure 2 is a schematic structural diagram of the mount of the present invention;

[0028] Figure 3 is a schematic diagram of the limiting structure of the mount of the present invention;

[0029] Figure 4 is a schematic diagram after the mount of the present invention is installed.

[0030] The schematic diagram is only for illustration purposes;

[0031] Among them, 1 is the suspension main spring; 101 is the base of the suspension main spring; 2 is the suspension bracket; 3 is the suspension arm; 4 is the suspension flow channel; 5 is the vehicle body longitudinal beam; 6 is the shock absorber tower; 7 is the limiting structure; 8 is the sheet metal bracket; 801 is the groove; 802 is the threaded hole; 9 is the riveting bolt; 10 is the bolt. Detailed implementation manners

[0032] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0033] Embodiment 1

[0034] As Figure 1 shown, the suspension structure needs to occupy a large space during installation, and there are problems such as the small size of the suspension main spring and the inability to make a strengthened structure for the shock absorber tower. In a typical implementation manner of the present invention, as Figures 2 - 4 shown, an installation structure of an integrated vehicle body suspension is provided, including a suspension and a limiting structure 7. The suspension includes a suspension main spring 1 and a suspension arm 3, and the suspension main spring 1 and the suspension arm 3 are vulcanized into an integral structure; the limiting structure 7 is located at the edge of the upper surface of the vehicle body longitudinal beam 5 where the shock absorber tower 6 is installed, and is an integral structure with the vehicle body longitudinal beam. The limiting structure 7 is a frame with a rectangular space, and the suspension is installed in the rectangular space of the frame to limit the suspension, so that the suspension is integrated into the frame of the vehicle body longitudinal beam.

[0035] The existing suspension is limited and fixed through a suspension bracket. When the layout space is insufficient, the present invention proposes to cancel the suspension bracket, install the suspension main spring on the vehicle body longitudinal beam, and achieve the limiting function by making feature improvements on the vehicle body longitudinal beam; the space occupied by the suspension bracket can be saved, which can be used to increase the size of the suspension main spring, and the shock absorber tower can also be strengthened at the corresponding position to improve the dynamic stiffness of the shock absorber tower. It can solve the layout problem while improving the NVH performance of the whole vehicle, and can also reduce costs.

[0036] In this embodiment, a sheet metal bracket 8 is provided on the inner wall surface of the frame. The size of the sheet metal bracket 8 is smaller than that of the frame, and the sheet metal bracket 8 is connected to the frame through a plurality of riveting bolts 9. Specifically, two riveting bolts are respectively used to fix the three surfaces of the sheet metal bracket that are in contact with the frame. Of course, welding can also be used for connection. The thickness of the sheet metal bracket can be selected according to the need of the limiting distance of the suspension main spring, and different thicknesses of sheet metal brackets can be installed to realize the standardization and batch production of the vehicle body longitudinal beam and the limiting structure.

[0037] Further, a groove 801 and a threaded hole 802 are provided at the bottom of the sheet metal bracket 8. The size of the groove 801 matches the size of the base of the suspension main spring 1. Further, a clearance fit is adopted between the sheet metal bracket 8 and the suspension main spring 1, and they are assembled by fixing with a bottom bolt 10. The bolt 10 sequentially passes through the threaded holes on the upper surface of the vehicle body longitudinal beam 5, the threaded holes at the bottom of the sheet metal bracket 8, and the threaded holes of the suspension main spring base 101 to fix the suspension main spring 1. The suspension main spring 1 is fixed only by one bottom bolt, and the number of assembly bolts is reduced from three to one, improving the assembly efficiency of the production line.

[0038] In this embodiment, the corners of the sheet metal bracket 8 adopt rounded transitions, which is convenient for assembly with the limiting structure. By providing the sheet metal bracket, the installation strength of the suspension is improved, and the dynamic stiffness of the vehicle body side is further improved.

[0039] In this embodiment, a suspension flow channel 4 is provided inside the suspension main spring 1, and the suspension flow channel 4 is filled with damping fluid. The damping fluid flows back and forth between the suspension channels, forming a certain damping effect, achieving a large damping effect at low frequencies and weakening the amplitude of vibration.

[0040] For the installation structure of the body integrated suspension provided in this embodiment, the size of the suspension main spring is greater than 80 mm, the damping angle is greater than 40°, and the X-direction limiting length is greater than 12 mm. While the diameter of the conventional main spring cavity is 60 mm and the damping angle > 35°. The diameter of the suspension main spring cavity structure of the present invention can reach 80 mm and the damping angle > 40°. The larger-sized suspension main spring increases the damping angle, and the damping effect is better, which can effectively attenuate the vibration of the engine, thereby improving the riding comfort. The X-direction limiting width of the conventional suspension main spring is about 12 mm, and the length of the X-direction limiting block of the suspension main spring of the present invention can reach 15 mm, which can reduce the X-direction dynamic-static ratio during acceleration and improve the comfort of the whole vehicle during the acceleration condition.

[0041] The sequence of the installation structure of the body integrated suspension provided in this embodiment is as follows:

[0042] In the first step, the suspension arm is vulcanized together with the rubber to obtain a main spring structure with an arm; in the second step, the flow channel system is assembled into the suspension main spring, and then damping fluid is filled; in the third step, the sheet metal bracket is assembled with the vehicle body longitudinal beam through riveting bolts; in the fourth step, the main spring is assembled onto the vehicle body and tightened with assembly bolts, and the tightening torque is 110 ± 11 N.m, and it is marked with a diagonal line.

[0043] In the steps, the first step and the second step are carried out at the suspension supplier to obtain the main spring assembly; the third step is carried out in the vehicle body welding workshop to obtain the vehicle body with suspension limiting; the fourth step is carried out in the general assembly workshop to complete the assembly.

[0044] The present invention breaks through the conventional suspension structure form. When the layout space is insufficient, it provides an operable suspension structure design solution. In the conventional suspension structure, the built-in suspension bracket plays a limiting role, making the size of the suspension relatively large, occupying the space of the shock absorber tower. If the shock absorber tower needs to be avoided, the dynamic stiffness of the whole vehicle has to be sacrificed, and the processing difficulty of the shock absorber tower is increased. The present invention cancels the suspension limiting bracket and uses the boundary of the shock absorber tower for limiting, which has the following advantages: 1. Release the space in the Y and X directions, enabling the shock absorber tower to be made stronger, improving the strength and stiffness of the shock absorber tower itself, and enhancing the vibration absorption performance of the whole vehicle; 2. In the conventional main spring cavity with a diameter of 60 mm and a damping angle > 35°, the main spring cavity structure of this structure has a diameter of 80 mm and a damping angle > 40°; 3. The conventional X-direction limiting block of the main spring is about 12 mm, and the length of the X-direction limiting block of the main spring of this structure is made 15 mm, reducing the X-direction static-dynamic ratio during acceleration and enhancing the comfort of the whole vehicle during the acceleration condition; 4. Cancel the installation points of the suspension on the longitudinal beam, increasing the crush zone for collision safety and improving the collision safety of the whole vehicle; 5. Rivet the sheet metal bracket to the shock absorber tower, improving the dynamic stiffness on the side of the vehicle body and enhancing the NVH performance of the whole vehicle; 6. The four sides of the sheet metal bracket adopt large fillet transitions, facilitating the assembly with the edge of the shock absorber tower; 7. During the tuning of the whole vehicle, the limiting distance can be adjusted by adjusting the thickness of the sheet metal bracket, which is beneficial to the tuning of the whole vehicle and is easy to achieve in batches; 8. The conventional assembly of the suspension main spring and the bracket is by interference fit, while this structure uses clearance fit and is assembled by fixing with bottom bolts; 9. The number of assembly bolts in the general assembly workshop is reduced from three to one, improving the assembly efficiency of the production line.

[0045] Embodiment 2

[0046] In a typical implementation manner of the present invention, an installation method for an installation structure of an integrated body suspension is provided, including the following steps:

[0047] First, vulcanize the armrest and the rubber together to obtain a suspension main spring with an armrest.

[0048] Then, assemble the flow channel system into the suspension main spring and fill damping liquid into the flow channel system.

[0049] Next, install the sheet metal bracket into the limiting structure on the vehicle body longitudinal beam.

[0050] Finally, assemble the suspension main spring into the limiting structure on the vehicle body longitudinal beam, tighten and fix it with bolts, and use the sheet metal bracket to limit and support the suspension main spring to integrate the suspension on the vehicle body.

[0051] Further, when tightening and fixing the suspension main spring with bolts, the tightening torque is 110 ± 11 N·m and is marked with a diagonal line.

[0052] Further, when installing the sheet metal bracket, select sheet metal brackets with different thicknesses for installation according to the need of the limiting distance.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mounting structure for a vehicle body integrated suspension, characterized in that: It includes a suspension and a limiting structure, wherein the suspension includes a suspension main spring and a suspension support arm, and the suspension main spring and the suspension support arm are vulcanized into an integrated structure; the limiting structure is located at the edge of the upper surface of the vehicle body longitudinal beam where the shock tower is installed, and is an integrated structure with the vehicle body longitudinal beam, and the limiting structure is a frame with a rectangular space, and a suspension is installed in the rectangular space of the frame to limit the suspension, so that the suspension is integrated in the frame of the vehicle body longitudinal beam.

2. The vehicle body integrated suspension installation structure according to claim 1, characterized in that: A sheet metal bracket is arranged on the inner wall surface of the frame. The size of the sheet metal bracket is smaller than the size of the frame. The sheet metal bracket is connected to the frame through a plurality of rivet bolts.

3. The vehicle body integrated suspension installation structure as claimed in claim 2, characterized in that: The bottom of the sheet metal bracket is provided with a groove and a threaded hole, and the size of the groove matches the size of the base of the suspended main spring.

4. The vehicle body integrated suspension installation structure as claimed in claim 3, characterized in that: The sheet metal bracket and the suspension main spring are fitted with clearance and assembled by bottom bolts. The bolts pass through the threaded holes on the upper surface of the vehicle body longitudinal beam, the threaded holes at the bottom of the sheet metal bracket and the threaded holes at the suspension main spring base in sequence to fix the suspension main spring.

5. The vehicle body integrated suspension installation structure as claimed in claim 2, characterized in that: The corners of the sheet metal bracket are rounded.

6. The vehicle body integrated suspension installation structure as claimed in claim 1, characterized in that: A suspension flow channel is arranged in the suspension main spring, and the suspension flow channel is filled with damping fluid.

7. The vehicle body integrated suspension installation structure as claimed in claim 1, characterized in that: The size of the suspended main spring cavity is greater than 80 mm, the damping angle is greater than 40°, and the X-direction limiting length is greater than 12 mm.

8. A method for installing a mounting structure of a vehicle body integrated suspension according to any one of claims 1 to 7, characterized in that: The following steps are involved: Firstly, the bracket arm and the rubber are vulcanized together to obtain the suspension main spring with the bracket arm; Then, the flow channel system is assembled into the suspension main spring, and the damping fluid is filled into the flow channel system; Then install the sheet metal bracket into the limiting structure on the longitudinal beam of the vehicle body; Finally, the main spring of the suspension is assembled into the limiting structure on the longitudinal beam of the vehicle body, fixed by tightening bolts, and the main spring of the suspension is limited and supported by a sheet metal bracket to integrate the suspension into the vehicle body.

9. The method for installing the vehicle body integrated suspension installation structure according to claim 8, characterized in that: When the suspension main spring is tightened and fixed with bolts, the tightening torque is 110±11N·m and marked with a slash.

10. The method for installing the vehicle body integrated suspension installation structure according to claim 8, characterized in that: When installing the sheet metal bracket, select sheet metal brackets of different thicknesses for installation according to the requirements of the limiting distance.

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