Rear pillar assembly structure, vehicle and design method of rear pillar assembly structure

Abstract

The invention discloses a rear strut assembly structure, a vehicle and a design method thereof, the rear strut assembly structure comprises a rear strut inner plate fixedly connected to a rear wheel cover outer plate and a rear wheel cover inner plate reinforcing plate fixedly connected to the rear wheel cover inner plate, and a rear strut supporting plate, a rear strut angle plate, a rear strut upper reinforcing plate and a top cover rear cross beam lower plate are fixedly connected to the rear strut inner plate; the rear supporting column supporting plate is arranged at an acute angle, the rear supporting column supporting plate and the rear supporting column angle plate are fixedly connected through the rear supporting column connecting plate, the rear supporting column upper reinforcing plate and the rear supporting column supporting plate are fixedly connected and arranged at an obtuse angle, the top cover rear cross beam lower plate and the rear supporting column inner plate are fixedly connected, and the top cover rear cross beam lower plate and the rear supporting column upper reinforcing plate are arranged at an obtuse angle. The cross section of the rear supporting column angle plate is quadrilateral, the rear wheel cover outer plate and the rear supporting column supporting plate are in lap joint in the Y direction, and the rear wheel cover inner plate reinforcing plate, the rear supporting column supporting plate and the top cover rear cross beam lower plate are arranged in a C shape. The bending torsional rigidity of the body-in-white can be improved in the project development stage.

Description

Technical Field

[0001] The invention belongs to the technical field of rear pillars, and in particular relates to a rear pillar assembly structure, a vehicle and a design method thereof. Background Art

[0002] In modern automobile design, the body in white is the core component of the vehicle structure, and its rigidity and durability directly affect the safety, handling and ride comfort of the entire vehicle. The body in white is composed of a variety of load-bearing structures, among which the rear pillar is an important structural component supporting the roof and the rear of the body, and its design is of great significance to the rigidity and stability of the entire vehicle.

[0003] The rear joint of the rear pillar roof is located at the key point where the body and the roof are connected, and is one of the concentrated points of force transmission. During the operation of the vehicle, external impact, vibration, bending and torsion forces will act on this part, so the rigidity of this joint has an important influence on the overall structural rigidity of the body in white. Insufficient rigidity of the rear joint of the roof will lead to a decrease in the overall rigidity of the body in white, thus affecting the vehicle's handling performance, body durability and occupant safety.

[0004] At present, the bending and torsional rigidity of the entire body in white is usually simulated and verified by simulation methods such as finite element analysis. Designers can ensure that the body in white has sufficient rigidity through overall modal analysis and bending torsional rigidity analysis. However, there is no clear design method or criterion for the rigidity design of local joints such as the rear joint of the rear pillar roof. The rigidity design of local joints often relies on experience or local reinforcement methods, and lacks a systematic design process, which brings certain challenges to later production and manufacturing, and may also lead to poor performance of the joints.

[0005] Therefore, how to improve the local rigidity of the rear joint of the rear pillar top cover through effective design and analysis methods so that it can meet the overall rigidity requirements of the body in white without increasing too much structural weight has become an urgent problem to be solved in the current automotive engineering field. Summary of the invention

[0006] In view of the defects in the prior art, the present invention provides a rear pillar assembly structure, a vehicle and a design method thereof, which can quickly improve the bending and torsional rigidity of the body-in-white in the project development stage.

[0007] The invention discloses a rear pillar assembly structure, comprising a rear pillar inner plate fixedly connected to a rear wheel cover outer plate and a rear wheel cover inner plate reinforcement plate fixedly connected to a rear wheel cover inner plate, wherein a rear pillar support plate, a rear pillar angle plate, a rear pillar upper reinforcement plate and a top cover rear cross beam lower plate are fixedly connected to the rear pillar inner plate, the rear pillar support plate is arranged at an acute angle, the rear pillar support plate and the rear pillar angle plate are fixedly connected via a rear pillar connecting plate, the rear pillar upper reinforcement plate is fixedly connected to the rear pillar support plate and the two are arranged at an obtuse angle, the top cover rear cross beam lower plate and the rear pillar inner plate are fixedly connected, and the top cover rear cross beam lower plate and the rear pillar upper reinforcement plate are arranged at an obtuse angle, the cross-sectional shape of the rear pillar angle plate is a quadrilateral, the rear wheel cover outer plate and the rear pillar support plate are overlapped in the Y direction, and the rear wheel cover inner plate reinforcement plate, the rear pillar support plate and the top cover rear cross beam lower plate are arranged in a C shape.

[0008] In a preferred embodiment of the present invention, the rear pillar support plate, the rear pillar angle plate and the rear pillar connecting plate form an A-shaped structure.

[0009] In a preferred embodiment of the present invention, the rear pillar, the rear pillar support plate, the rear pillar angle plate, the rear pillar upper reinforcement plate and the lower plate of the rear cross beam of the roof constitute a four-way valve type X-joint.

[0010] The invention also discloses a vehicle, which comprises a rear pillar assembly structure.

[0011] The present invention also discloses a design method for a rear pillar assembly structure, which includes building a three-dimensional rear pillar assembly structure; applying constraints to the three-dimensional model, applying loads to the three-dimensional model, and determining deformation monitoring points of the three-dimensional model; completing structural stiffness simulation of the three-dimensional model, and optimizing the structure based on the simulation results.

[0012] In a preferred embodiment of the present invention, constraints in three forced excitation directions are imposed on the three-dimensional model.

[0013] In a preferred embodiment of the present invention, a load is applied to the lower portion of the X-joint of the three-dimensional model based on the force limit of the shock absorber of the actual vehicle.

[0014] In a preferred embodiment of the present invention, the deformation monitoring point is the center of the X-joint of the three-dimensional model.

[0015] In a preferred embodiment of the present invention, structural weak points are identified through simulation analysis, specifically including: comparing the deformation data of the other three fixed constraints of the base vehicle X-type four-way joint and the middle part between the loading point and the detection point; judging that the position where the deformation is greater than the deformation detection point position is the structural weak point.

[0016] In a preferred embodiment of the present invention, the optimization method includes adding an A-type connection to the X-type joint for the simulated weak point to strengthen the connection between the joint and the constraint; adding a partition layer in front of the weak point of the joint to construct a support cavity to support the rigidity of the joint; increasing the connection area between the wheel cover outer panel and the D-pillar support panel to strengthen the force transmission from the load force to the joint position.

[0017] The beneficial effects of the present invention are as follows: the vehicle body rear structure optimization method proposed in the present invention achieves effective improvement of the overall rigidity of the body in white by precise positioning and improvement of local joint rigidity, and provides an innovative and efficient optimization solution for the field of automobile structural design.

[0018] The present invention constructs a rear pillar upper joint structure to form a four-way valve structure, which effectively improves the rigidity of the rear joint of the rear pillar top cover. This improvement directly enhances the overall structural strength of the body in white, thereby improving the rigidity performance of the entire vehicle.

[0019] Secondly, the present invention innovatively proposes to use the structural rigidity and local rigidity of the joint as the assessment items. This method breaks through the limitations of traditional simulation analysis that only relies on the overall modal and bending-torsion rigidity. By accurately locating and optimizing the rigidity of local joints, this method provides a more direct and effective way to achieve the overall rigidity of the body-in-white. This not only simplifies the design process, but also improves the accuracy and efficiency of optimization.

[0020] Furthermore, the simulation model analysis method adopted by the present invention can accurately identify structural weaknesses and optimize them in a targeted manner. This method not only improves the accuracy of structural design, but also greatly reduces the time and cost of repeated tests. By optimizing key parts such as the X-joint, the front joint weak points, and the connection between the wheel house outer panel and the D-pillar support plate, this method achieves a significant improvement in structural stiffness, from the initial 58435N / mm to 69000N / mm, exceeding the design target of 60000N / mm.

[0021] In addition, the method of the present invention has good adaptability and scalability. By adjusting simulation parameters and optimization schemes, the method can be applied to the optimization of the rear structure of the body-in-white of different models, providing a powerful tool for automobile design engineers.

[0022] Finally, the optimization method of the present invention not only improves the structural strength of the vehicle body, but also helps to improve the overall performance of the vehicle, including driving stability, noise vibration and harshness (NVH) performance, etc. These improvements will directly translate into a better driving experience and higher product quality, and enhance the market competitiveness of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a partial enlarged schematic diagram of the present invention;

[0026] Figure 3 It is a schematic diagram of the positions of the rear pillar support plate and the rear wheel cover outer plate of the present invention;

[0027] Figure 4 It is a schematic diagram of a rear pillar support plate of the present invention;

[0028] Figure 5 It is a schematic diagram of a four-way valve type X connector of the present invention;

[0029] Figure 6 It is a schematic diagram of the rear pillar support plate cavity reinforcement structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the rear pillar support plate cavity reinforcement structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the Y-direction overlap between the wheel house outer plate and the rear pillar support plate of the present invention;

[0032] Fig. 9 Schematic diagram of the C ring of the present invention;

[0033] Fig.10 is a schematic diagram of the complete C ring of the present invention;

[0034] Fig.11 It is a schematic diagram of the constraint and load positions of the present invention;

[0035] Fig.12 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0036] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention discloses a rear pillar assembly structure, comprising a rear pillar inner plate 1 fixedly connected to a rear wheel cover outer plate 7 and a rear wheel cover inner plate reinforcement plate 8 fixedly connected to a rear wheel cover inner plate 9, a rear pillar support plate 2, a rear pillar angle plate 3, a rear pillar upper reinforcement plate 5 and a top cover rear cross beam lower plate 6 are fixedly connected to the rear pillar inner plate 1, the rear pillar support plate 2 and the rear pillar angle plate 3 are arranged at an acute angle, the rear pillar support plate 2 and the rear pillar angle plate 3 are fixedly connected through a rear pillar connecting plate 4, the rear pillar upper reinforcement plate 5 is fixedly connected to the rear pillar support plate 2 and the two are arranged at an obtuse angle, the top cover rear cross beam lower plate 6 is fixedly connected to the rear pillar inner plate 1, and the top cover rear cross beam lower plate 6 and the rear pillar upper reinforcement plate 5 are arranged at an obtuse angle, the cross-sectional shape of the rear pillar angle plate 3 is a quadrilateral, the rear wheel cover outer plate 7 and the rear pillar support plate 2 are overlapped in the Y direction, and the rear wheel cover inner plate reinforcement plate 8, the rear pillar support plate 2 and the top cover rear cross beam lower plate 6 are arranged in a C shape. The rear pillar support plate 2, the rear pillar angle plate 3 and the rear pillar connecting plate 4 form an A-shaped structure. The rear pillar, the rear pillar support plate 2, the rear pillar angle plate 3, the rear pillar upper reinforcement plate 5 and the top cover rear cross beam lower plate 6 form a four-way valve type X-joint. The present invention forms a rear pillar assembly with strong structural rigidity and light weight by constructing an A-shaped reinforcement structure, a four-way valve structure, a cavity reinforcement, an additional Y-direction overlap and a complete C ring.

[0038] The present invention optimizes and improves the structure through the following optimization design method:

[0039] S1. Construct the upper joint structure of the rear support to form Figure 6 The four-way valve structure shown;

[0040] S2. According to the influence of the excitation on the rear part of the vehicle body, the main source of the road excitation on the rear part of the vehicle body is the rear shock absorber;

[0041] Therefore, the following simulation model is constructed:

[0042] Constrain the three forced excitation directions of the X-type joint;

[0043] Load is applied through the lower part of the X-joint (loaded according to the actual vehicle shock absorber force limit)

[0044] The middle connection center of the butt joint is set as the deformation monitoring point, and the deformation amount here is simulated

[0045] The deformation here is the structural stiffness of the X-shaped structure, which is used to support the stiffness of the entire vehicle.

[0046] 3. Simulation structure and identification of structural weaknesses and their optimization;

[0047] The structural stiffness of the initial X-joint of the base vehicle is 58435N / mm, but the rear of the vehicle body is generally 60000N / mm. The structural stiffness of the four-way joint of the base vehicle is lower than the target of the rear joint of the vehicle body and does not meet the design target;

[0048] By comparing the deformation data of the other three fixed constraints of the X-type four-way joint of the basic vehicle and the middle part between the loading point and the detection point and the deformation of the upper part of the joint, the yellow positions in the figure are all higher than the deformation detection point, so it is judged that the structure in these three directions is relatively weak; after inputting the load force to the load loading point, after constraining 1 / 2 / 3, there are corresponding deformations (simulation values) at various locations on the four-way joint, among which the positions where the deformation is greater than the deformation detection point are structural weak points, which will affect and cause the structural stiffness of the four-way joint to reach the target value; through the simulation results, the deformation of the structure in the yellow area in the figure is greater than the detection point, so it is judged that this is a weak point and needs to be strengthened.

[0049] Therefore, the following optimizations are performed on the three areas shown in the figure, and various solutions are simulated in sequence and combination. The following strengthening solutions are performed on the three locations respectively:

[0050] Optimization 1: Add A-type connection to the X-type joint for the simulation weak point, and strengthen the connection between the joint and the 3 constraints;

[0051] Optimization 2: Add a partition layer at the weak point of the front joint to build a support cavity and support the joint rigidity;

[0052] Optimization 3: Increase the connection area between the wheel arch outer panel and the D-pillar support plate to strengthen the force transmission from the load force to the joint position

[0053] S4. Scheme Validation

[0054] After another structural stiffness simulation of the optimized structure, the structural stiffness of the final optimized solution reached 69000N / mm, meeting the design requirements; the deformation data of the middle part in the three constraint directions and loading direction were close and the same as the deformation of the upper part of the joint.

[0055] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A rear pillar assembly structure, comprising a rear pillar inner plate (1) fixedly connected to a rear wheel housing outer plate (7) and a rear wheel housing inner plate reinforcement plate (8) fixedly connected to a rear wheel housing inner plate (9), characterized in that: The rear pillar inner plate (1) is fixedly connected with a rear pillar support plate (2), a rear pillar angle plate (3), a rear pillar upper reinforcement plate (5) and a roof rear cross beam lower plate (6); the rear pillar support plate (2) and the rear pillar angle plate (3) are arranged at an acute angle; the rear pillar support plate (2) and the rear pillar angle plate (3) are fixedly connected via a rear pillar connecting plate (4); the rear pillar upper reinforcement plate (5) is fixedly connected to the rear pillar support plate (2) and the two are arranged at an acute angle. An obtuse angle arrangement, wherein the lower plate (6) of the rear cross beam of the top cover and the inner plate (1) of the rear pillar are fixedly connected and the lower plate (6) of the rear cross beam of the top cover and the upper reinforcing plate (5) of the rear pillar are arranged at an obtuse angle, the cross-sectional shape of the rear pillar angle plate (3) is a quadrilateral, the outer plate (7) of the rear wheel cover and the rear pillar support plate (2) are overlapped in the Y direction, and the inner plate reinforcing plate (8) of the rear wheel cover, the rear pillar support plate (2) and the lower plate (6) of the rear cross beam of the top cover are arranged in a C shape.

2. The rear support assembly structure according to claim 1, characterized in that: The rear pillar support plate (2), the rear pillar angle plate (3) and the rear pillar connecting plate (4) together form an A-shaped structure.

3. The rear support assembly structure according to claim 1, characterized in that: The rear pillar, the rear pillar support plate (2), the rear pillar angle plate (3), the rear pillar upper reinforcement plate (5) and the top cover rear cross beam lower plate (6) form a four-way valve type X-joint.

4. A vehicle, characterized in that: It comprises the rear pillar assembly structure as described in any one of claims 1 to 3.

5. A design method for a rear pillar assembly structure, characterized in that: Three-dimensional modeling of the rear pillar assembly structure as described in any one of claims 1 to 3; applying constraints to the three-dimensional model, applying loads to the three-dimensional model, and determining deformation monitoring points of the three-dimensional model; Complete the structural stiffness simulation of the 3D model and optimize the structure based on the simulation results.

6. The design method of the rear pillar assembly structure according to claim 5, characterized in that: Constraints in three forced excitation directions are imposed on the three-dimensional model.

7. The design method of the rear pillar assembly structure according to claim 5, characterized in that: Based on the stress limit of the real vehicle shock absorber, load is applied to the lower part of the X-joint of the three-dimensional model.

8. The design method of the rear pillar assembly structure according to claim 5, characterized in that: The deformation monitoring point is the center of the X joint of the three-dimensional model.

9. The design method of the rear support assembly structure according to claim 5, characterized in that: The structural weak points are identified through simulation analysis, specifically including: comparing the deformation data of the other three fixed constraints of the base vehicle's X-type four-way joint and the middle part between the loading point and the detection point; and determining that the position where the deformation is greater than the deformation detection point is the structural weak point.

10. The design method of the rear support assembly structure according to claim 5, characterized in that: The optimization method includes adding an A-type connection to the X-type joint for the simulated weak point to strengthen the connection between the joint and the constraint; adding a partition layer in front of the weak point of the joint to construct a support cavity to support the rigidity of the joint; increasing the connection area between the wheel arch outer panel and the D-pillar support plate to strengthen the force transmission from the load force to the joint position.

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