Lightweight design method for high-strength treading device

Abstract

The invention provides a lightweight design method for a high-strength treading device, and relates to the technical field of automobiles. According to the design method, on the basis of combination of ergonomic school pairs and CAE simulation analysis, the trampling device meeting the requirements for light weight and bearing performance is designed by benchmarking vehicle models, setting a product weight target and adjusting a basic framework in the design of the trampling device. According to the lightweight design method for the high-strength treading device, lightweight design can be conducted on the treading device, the weight of a product is reduced as much as possible on the premise that the bearing performance is guaranteed, meanwhile, the development period of automobile parts is shortened, and the market competitiveness is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, in particular to a lightweight design method for a high-strength pedaling device. Background Art

[0002] Due to the large size and height of heavy-duty vehicles, a step needs to be installed between the chassis and the cab body to facilitate the entry of drivers and passengers into the cab. At present, when designing the step, designers often design it based on experience and theoretical strength verification calculation methods, and then conduct static load and dynamic load tests on the product after the design is completed.

[0003] This design method not only lacks scientific basis, but also results in the designed product being too overweight, resulting in a long design cycle and waste of costs, or the designed product failing to meet the load-bearing performance indicators, resulting in waste of materials and product molds after mold opening. In addition, since the samples need to be tested for static and dynamic loads after the design is completed, the test costs will be increased, resulting in an increase in production costs. Summary of the invention

[0004] In response to the above problems, the present application provides a lightweight design method for a high-strength pedaling device, which can perform lightweight design on the pedaling device and reduce the weight of the product as much as possible while ensuring the load-bearing performance.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A lightweight design method for a high-strength pedaling device comprises the following steps:

[0007] S1. Set the design product weight target G0;

[0008] S2. Design the basic framework;

[0009] S3, formulate the load-bearing condition of the vehicle, and determine the maximum elastic deformation A allowed by the pedal device in the Z direction;

[0010] S4, performing simulation analysis on the working condition set in step S4, and measuring the deformation M of the pedaling device, if the deformation M of the pedaling device is less than or equal to A, proceed to the next step; if the deformation M of the pedaling device is greater than or equal to A, adjusting the basic skeleton, and re-performing simulation analysis;

[0011] S5. Measure product weight G1;

[0012] If G1≤G0, the design is complete;

[0013] If G1>G0, the basic skeleton is adjusted and the process returns to step S4 to perform simulation analysis again.

[0014] Furthermore, the pedaling device includes a bracket, one end of the bracket close to the vehicle body is fixedly connected to the lower vehicle body, and the end of the bracket facing away from the vehicle body is provided with a basic frame, and the basic frame includes an upper horizontal plate and a lower horizontal plate, and a plurality of vertical plates are provided between the upper horizontal plate and the lower horizontal plate, and a shell is provided on the upper side of the basic frame.

[0015] Furthermore, a sponge rubber pad is provided between the basic frame and the treading portion of the shell.

[0016] Furthermore, the basic parameters of the basic frame include the width L of the basic frame, the distance L1 between the two outermost vertical plates, the thickness L2 of the vertical plate, the limit distance L3 from the outer end surface of the basic frame to the outer end of the shell, and the height H of the basic frame.

[0017] Furthermore, the maximum elastic deformation allowed for the pedal device in the Z direction is 7.5 mm.

[0018] Furthermore, the vehicle load-bearing capacity conditions formulated in step S3 include:

[0019] Working condition 1, the loading position is the middle position of the front door;

[0020] Condition 2, the loading position is the middle position of the rear door;

[0021] Working condition 3, the loading position is the middle position between the front and rear doors;

[0022] Working condition 4, the loading position is the frontmost steppable position;

[0023] Working condition 5: the loading position is the rearmost steppable position.

[0024] Furthermore, the loading directions of working conditions 1 to 5 are all -Z direction of the vehicle coordinate system.

[0025] Furthermore, the loaded load of working condition 1 is 1323N, the loaded load of working condition 2 is 1323N, the loaded load of working condition 3 is 1127N, the loaded load of working condition 4 is 882N, and the loaded load of working condition 5 is 882N.

[0026] Furthermore, in step S4, the length of the loading area is set to 102 mm-110 mm, and the width is the width of the middle step of the pedaling device.

[0027] The beneficial effects of the present invention are:

[0028] The embodiment of the present application provides a lightweight design method for a high-strength pedaling device, which formulates a lightweight plan, performs lightweight design on the pedaling device, obtains a feasible lightweight plan, verifies it through experiments, and finally achieves the lightweight goal. This method can effectively improve the efficiency and accuracy of verification analysis, provide a basis for the lightweight design of a high-strength pedaling device, and has a significant lightweight effect, which reduces material costs while ensuring load-bearing performance; at the same time, this method also shortens the development cycle of automotive parts and improves the market competitiveness of automotive parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of the basic skeleton;

[0030] Figure 2 A schematic diagram of the basic parameters;

[0031] Figure 3 It is the loading diagram of working condition 1;

[0032] Figure 4 It is the loading diagram of working condition 2;

[0033] Figure 5 It is the loading diagram of working condition 3;

[0034] Figure 6 It is the loading diagram of working condition 4;

[0035] Figure 7 It is the loading diagram of working condition 5;

[0036] Figure 8 A schematic flow chart of a lightweight design method for a high-strength pedaling device provided in this application.

[0037] In the figure: 1. bracket; 11. horizontal part; 12. bending part; 13. connecting part; 2. fixing bolts; 3. basic frame; 31. upper horizontal plate; 32. lower horizontal plate; 33. vertical plate; 4. rivet bolts; 5. shell; 51. middle step; 52. first protection part; 53. second protection part; 6. sponge rubber pad. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work on the basis of the embodiments of the present application shall belong to the protection scope of the present application.

[0039] A lightweight design method for a high-strength pedaling device comprises the following steps:

[0040] S1. According to market positioning and customer needs, benchmark the weight of competing products and set the design product weight target G0.

[0041] S2. Design the basic skeleton 3 and set the basic parameters L, L1, L2, L3, H.

[0042] As a specific implementation method, Figure 1 As shown, the pedaling device described in this embodiment includes a bracket 1, and the bracket 1 includes a horizontal portion 11. The end of the horizontal portion 11 close to the vehicle body is provided with a bent portion 12, and the upper end of the bent portion 12 is provided with a connecting portion 13, and the connecting portion 13 is fixedly connected to the lower vehicle body through a fixing bolt 2. Exemplarily, the bracket 1 is made of Q235.

[0043] A basic frame 3 extending along the direction of travel of the automobile is arranged on the horizontal portion 11 of the bracket 1. The basic frame 3 includes an upper horizontal plate 31 and a lower horizontal plate 32, and a plurality of vertical plates 33 extending along the direction of travel of the automobile are arranged between the upper horizontal plate 31 and the lower horizontal plate 32. Exemplarily, four vertical plates 33 are arranged between the upper horizontal plate 31 and the lower horizontal plate 32, and the upper ends of the vertical plates 33 are fixedly connected to the upper horizontal plate 31, and the lower ends of the vertical plates 33 are fixedly connected to the lower horizontal plate 32. The lower horizontal plate 32 is fixedly connected to the horizontal portion 11 of the bracket 1 by means of rivet bolts 4, and avoidance holes for avoiding installation tools are arranged on the upper horizontal plate 31 at locations corresponding to the rivet bolts 4.

[0044] A shell 5 is provided on the upper side of the basic frame 3, and the shell 5 includes an intermediate step 51, and the intermediate step 51 is fixedly connected to the basic frame 3 in a detachable manner. A first protection portion 52 is provided at one end of the intermediate step 51 facing away from the vehicle body, and the first protection portion 52 forms a covering effect on the outer end of the basic frame 3. A second protection portion 53 extending generally upward is provided at one end of the intermediate step 51 facing the vehicle body. Exemplarily, the shell 5 is a plastic part, made of plastic.

[0045] Furthermore, a sponge rubber pad 6 is provided between the basic frame 3 and the treading portion of the shell 5 .

[0046] like Figure 2 As shown, the basic parameters include the width L of the basic frame 3, the distance L1 between the two outermost vertical plates 33, the thickness L2 of the vertical plate 33, the limit distance L3 from the outer end surface of the basic frame 3 to the outer end of the shell 5, and the height H of the basic frame 3.

[0047] S3. Develop vehicle load-bearing conditions and non-performance standards based on usage scenarios.

[0048] The performance criteria are the maximum elastic deformation A of the pedal device in the Z direction and the yield strength of the bracket 1. When the maximum deformation of the pedal device in the Z direction is less than or equal to A, and the stress of the bracket 1 is less than the yield strength, the performance criteria are met.

[0049] As a specific implementation, the value of A in this embodiment is 7.5 mm, that is, when the maximum deformation of the pedal device in the Z direction is ≤7.5 mm and the stress of the bracket 1 is less than the yield strength, the performance standard is met.

[0050] The load-carrying conditions specified include:

[0051] Working condition 1, such as Figure 3 As shown, the loading position is the middle position of the front door, the loading direction is the -Z direction of the vehicle coordinate system, and the loaded load is 1323N (135Kg).

[0052] Working condition 2, such as Figure 4 As shown, the loading position is the middle position of the rear door, the loading direction is the -Z direction of the vehicle coordinate system, and the loaded load is 1323N (135Kg).

[0053] Condition 3, such as Figure 5 As shown, the loading position is the middle position between the front and rear doors, the loading direction is the -Z direction of the vehicle coordinate system, and the loaded load is 1127N (115Kg).

[0054] Condition 4, such as Figure 6 As shown, the loading position is the frontmost steppable position, the loading direction is the -Z direction of the vehicle coordinate system, and the loaded load is 882N (90Kg).

[0055] Working condition 5, such as Figure 7 As shown, the loading position is the rearmost steppable position, the loading direction is the -Z direction of the vehicle coordinate system, and the loaded load is 882N (90Kg).

[0056] S4. Perform simulation analysis on the working condition formulated in step S4 through CAE, and measure the deformation M of the pedaling device. If the deformation M of the pedaling device is less than or equal to A, proceed to the next step; if the deformation M of the pedaling device is greater than or equal to A, adjust the basic skeleton 3 and perform simulation analysis again through CAE.

[0057] Working condition 1, the maximum deformation of the pedal device is 7.0104mm, and the stress of bracket 1 is 199.15MPa, which is less than the yield strength of material Q235 and meets the requirements.

[0058] Working condition 2, the maximum deformation of the pedal device is 6.1815mm, and the stress of bracket 16 is 211.85MPa, which is less than the yield strength of material Q235 and meets the requirements.

[0059] Working condition 3, the maximum deformation of the pedal device is 6.7019mm, and the stress of bracket 16 is 200.02MPa, which is less than the yield strength of material Q235 and meets the requirements.

[0060] Working condition 4, the maximum deformation of the pedal device is 5.085mm, and the stress of bracket 16 is 175.2MPa, which is less than the yield strength of material Q235 and meets the requirements.

[0061] Working condition 5, the maximum deformation of the pedal device is 2.9569mm, and the stress of bracket 16 is 177.21MPa, which is less than the yield strength of material Q235 and meets the requirements.

[0062] Through the analysis of the above five working conditions, the stresses are all less than the allowable stress, and the maximum elastic deformation of the pedal device in the Z direction is ≤7.5mm, which meets the requirements.

[0063] It should be pointed out that the simulations mentioned above are relatively successful, but in the development of new products, simulation and test results often cannot guarantee one-time pass, which requires targeted optimization of the design scheme. For example, the pedal device is lightweight, but the performance is unqualified; the performance is qualified, but the weight is overweight.

[0064] As a specific implementation, the pedaling device in this embodiment is simulated by finite element using 3D units, and the average unit size is 10 mm.

[0065] As a specific implementation, this embodiment simulates a size 42 shoe (the size of 90% of Chinese male feet).

[0066] The length of the loading area is set to 102 mm-110 mm (the dimension along the traveling direction of the vehicle), and the width is set to the width of the middle step 51 of the pedal device.

[0067] S5. Measure product weight G1.

[0068] If G1≤G0, the product is lightweight and qualified. At this point, the product's load-bearing performance and weight are qualified, and the design is completed.

[0069] If G1>G0, it means that the product is overweight, and the basic skeleton 3 is adjusted through ergonomic analysis, and the process returns to step S4 to perform simulation analysis through CAE again.

[0070] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments of the present application on the basis of the embodiments provided in the present application do not exceed the protection scope of the present application.

[0071] The above specific implementation methods have detailed the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. That is, any modifications, equivalent substitutions, improvements, etc. made on the basis of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A lightweight design method for a high-strength pedaling device, characterized in that: The following steps are included: S1. Set the design product weight target G0; S2, design basic framework (3); S3, formulate the load-bearing condition of the vehicle, and determine the maximum elastic deformation A allowed by the pedal device in the Z direction; S4, performing simulation analysis on the working condition set in step S4, and measuring the deformation M of the pedaling device. If the deformation M of the pedaling device is less than or equal to A, proceed to the next step; if the deformation M of the pedaling device is greater than or equal to A, adjusting the basic skeleton (3) and re-performing simulation analysis; S5. Measure product weight G1; If G1≤G0, the design is complete; If G1>G0, the basic skeleton (3) is adjusted and the process returns to step S4 to perform simulation analysis again.

2. The lightweight design method for a high-strength pedaling device according to claim 1, characterized in that: The pedal device comprises a bracket (1), one end of the bracket (1) close to the vehicle body is fixedly connected to the lower vehicle body, the end of the bracket (1) facing away from the vehicle body is provided with a basic frame (3), the basic frame (3) comprises an upper horizontal plate (31) and a lower horizontal plate (32), a plurality of vertical plates (33) are provided between the upper horizontal plate (31) and the lower horizontal plate (32), and a shell (5) is provided on the upper side of the basic frame (3).

3. A lightweight design method for a high-strength pedaling device according to claim 2, characterized in that: A sponge rubber pad (6) is provided between the basic frame (3) and the treading portion of the shell (5).

4. The lightweight design method for a high-strength pedaling device according to claim 2, characterized in that: The basic parameters of the basic frame (3) include the width L of the basic frame (3), the distance L1 between the two outermost vertical plates (33), the thickness L2 of the vertical plate (33), the limit distance L3 from the outer end surface of the basic frame (3) to the outer end of the shell (5), and the height H of the basic frame (3).

5. The lightweight design method of a high-strength pedaling device according to claim 1, characterized in that: The maximum elastic deformation allowed for the pedal device in the Z direction is 7.5 mm.

6. The lightweight design method for a high-strength pedaling device according to claim 1, characterized in that: The vehicle load-bearing conditions formulated in step S3 include: Working condition 1, the loading position is the middle position of the front door; Working condition 2, the loading position is the middle position of the rear door; Working condition 3, the loading position is the middle position between the front and rear doors; Working condition 4, the loading position is the frontmost steppable position; Working condition 5: the loading position is the rearmost steppable position.

7. A lightweight design method for a high-strength pedaling device according to claim 6, characterized in that: The loading directions of working conditions 1 to 5 are all in the -Z direction of the vehicle coordinate system.

8. The lightweight design method for a high-strength pedaling device according to claim 6, characterized in that: The loaded load of working condition 1 is 1323N, the loaded load of working condition 2 is 1323N, the loaded load of working condition 3 is 1127N, the loaded load of working condition 4 is 882N, and the loaded load of working condition 5 is 882N.

9. The lightweight design method for a high-strength pedaling device according to claim 1, characterized in that: In step S4, the length of the loading area is set to 102 mm-110 mm, and the width is the width of the middle step (51) of the pedaling device.

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