A method for designing the holding force of a rubber bushing of a vehicle suspension stabilizer bar

Abstract

This invention relates to a method for designing the clamping force of a rubber bushing for an automotive suspension stabilizer bar, comprising the following steps: S1: Calculating the Y-axis component force F acting on the connecting rod during tire vertical bounce. 连接杆Y S2: According to formula F 抱紧力 =F 衬套Y +uF 抱紧力 Calculate the clamping force F of the rubber bushing 抱紧力 , of which F 衬套Y F represents the Y-axis component of the force exerted by the rubber bushing on the stabilizer bar during the tire's vertical bounce. 衬套Y =F 连接杆Y U represents the attenuation rate of the rubber bushing material. This invention proposes a more precise and reliable method for designing the clamping force of the rubber bushing of an automotive suspension stabilizer bar. This method can reduce the risk of relative movement between the stabilizer bar and the rubber bushing in the early stages of design, thereby reducing the risk of abnormal noise and interference at the stabilizer bar. It provides a simple and feasible technical support for the forward design of automotive suspension systems.

Description

Technical Field

[0001] This invention relates to automobiles, and more specifically to a method for designing the clamping force of rubber bushings for automobile suspension stabilizer bars. Background Technology

[0002] A stabilizer bar is an elastic element in a car's suspension, its function being to reduce body roll. For example... Figure 1 As shown, the two ends of the stabilizer bar 1 are connected to the front control arm assembly or the front strut assembly 6 via connecting rods 2, and the middle part of the stabilizer bar 1 is connected to the subframe or body via bracket 4 and rubber bushing 3. When the two tires 5 on the same axle of the vehicle move up / down synchronously, the stabilizer bar 1 does not function. When the two tires 5 on the same axle of the vehicle move up / down asynchronously, the stabilizer bar 1 is subjected to a tension force from the connecting rod 2, which is decomposed into a vertical force and a horizontal force. The vertical force causes the stabilizer bar 1 to twist, thereby reducing body roll; the horizontal force causes the stabilizer bar 1 to be in tension, creating a force that causes the stabilizer bar 1 and the rubber bushing 3 to move relative to each other. The rubber bushing 3 needs to provide a sufficiently large clamping force to counteract this horizontal force. In the prior art, there is no method that can accurately and reliably determine the clamping force of the rubber bushing. Summary of the Invention

[0003] The purpose of this invention is to propose a method for designing the clamping force of rubber bushings for automotive suspension stabilizer bars, which can determine the clamping force of rubber bushings more accurately and reliably.

[0004] The present invention discloses a method for designing the clamping force of a rubber bushing for an automotive suspension stabilizer bar, comprising the following steps:

[0005] S1: Calculate the Y-axis force F acting on the connecting rod during the tire's vertical bounce. 连接杆Y ;

[0006] S2: Calculate the clamping force F of the rubber bushing according to formula (101). 抱紧力 :

[0007] F 抱紧力 =F 衬套Y +uF 抱紧力 (101)

[0008] Among them, F 衬套Y F represents the Y-axis component of the force exerted by the rubber bushing on the stabilizer bar during the tire's vertical bounce. 衬套Y =F 连接杆Y , where u is the attenuation rate of the rubber bushing material.

[0009] Optionally, S1 further includes the following step:

[0010] S101: The analysis results of the tire's vertical bounce process are obtained through simulation analysis. The analysis results include the coordinate parameters of the upper connection point of the connecting rod and the coordinate parameters of the lower connection point of the connecting rod.

[0011] S102: Based on the analysis results, calculate the Y-axis component force F on the connecting rod during the tire's vertical jump according to formula (102). 连接杆Y :

[0012]

[0013] Where K is the linear stiffness of the stabilizer bar, and dz B The Z-axis displacement of the lower connection point of the connecting rod is y. A Let z be the Y-coordinate of the connection point on the connecting rod. A Let y be the Z-coordinate value of the connection point on the connecting rod. B Let z be the Y-coordinate of the lower connection point of the connecting rod. B This is the Z-coordinate value of the lower connection point of the connecting rod.

[0014] Optionally, S101 includes the following steps: building an assembly digital model of the suspension system using 3D modeling software, and performing simulation analysis using a mechanism motion module to simulate the tire jumping process.

[0015] Optionally, S102 includes the following steps: dividing the analysis results into segments with a preset step size, and calculating the Y-axis component force F on each segment connecting rod according to the formula (102). 连接杆Y .

[0016] Optional, S3: with F 抱紧力 The maximum value is used as the design requirement value for clamping force when selecting or designing the rubber bushing.

[0017] This invention proposes a more precise and reliable method for designing the clamping force of the rubber bushing of the automotive suspension stabilizer bar. This method can reduce the risk of relative movement between the stabilizer bar and the rubber bushing in the early stages of design, thereby reducing the risk of abnormal noise and interference at the stabilizer bar. It provides a simple and feasible technical support for the forward design of automotive suspension systems. Attached Figure Description

[0018] Figure 1 Diagram illustrating the working principle of the stabilizer bar's Y-axis axial movement;

[0019] Figure 2 This is a force analysis diagram of the stabilizer bar system in the vehicle coordinate system.

[0020] Among them, 1-stabilizer bar, 2-connecting rod, 21-upper connection point of connecting rod, 22-lower connection point of connecting rod, 3-rubber bushing, 4-bracket, 5-tire, 6-front strut assembly. Detailed Implementation

[0021] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] This invention proposes a method for designing the clamping force of rubber bushings for automotive suspension stabilizers, comprising the following steps:

[0024] S1: Calculate the Y-axis force F acting on the connecting rod during the tire's vertical bounce. 连接杆Y ;

[0025] S2: Calculate the clamping force F of the rubber bushing according to formula (101). 抱紧力 :

[0026] F 抱紧力 =F 衬套Y +uF 抱紧力 (101)

[0027] Among them, F 衬套Y F represents the Y-axis component of the force exerted by the rubber bushing on the stabilizer bar during the tire's vertical bounce. 衬套Y =F 连接杆Y , where u is the attenuation rate of the rubber bushing material.

[0028] By adopting the above technical solution, the clamping force of the rubber bushing of the car suspension stabilizer bar can be determined in the early stage of car design. It is a more accurate and reliable method for designing the clamping force of the rubber bushing of the car suspension stabilizer bar, which helps to reduce the risk of relative movement between the stabilizer bar and the rubber bushing, thereby reducing the risk of abnormal noise and interference at the stabilizer bar. It provides a simple and feasible technical support for the forward design of the car suspension system.

[0029] In some embodiments, S1 further includes the following steps:

[0030] S101: The analysis results of the tire's vertical bounce process are obtained through simulation analysis. The analysis results include the coordinate parameters of the upper connection point of the connecting rod and the coordinate parameters of the lower connection point of the connecting rod.

[0031] S102: Based on the analysis results, calculate the Y-axis component force F on the connecting rod during the tire's vertical jump according to formula (102). 连接杆Y :

[0032]

[0033] Where K is the linear stiffness of the stabilizer bar, and dz B The Z-axis displacement of the lower connection point of the connecting rod is y. A Let z be the Y-coordinate of the connection point on the connecting rod. A Let y be the Z-coordinate value of the connection point on the connecting rod. B Let z be the Y-coordinate of the lower connection point of the connecting rod. B This is the Z-coordinate value of the lower connection point of the connecting rod.

[0034] Using the above technical solution, modeling and simulation can be performed on the suspension system based on its parameters in the early stages of automobile design. The analysis results of the tire's vertical bounce process can be obtained through simulation, and F can be calculated based on the analysis results and formula (102). 连接杆Y It is easy to implement.

[0035] In some embodiments, step S101 includes the following steps: building an assembly digital model of the suspension system using 3D modeling software, and applying a mechanism motion module for simulation analysis to simulate the tire's vertical jump process. In specific implementations, the 3D modeling software can be, but is not limited to, 3DS Max, Pro / Engineer, UG, or SolidWorks.

[0036] In some embodiments, S102 includes the following steps: segmenting the analysis results into segments with a preset step size, and calculating the Y-axis component force F on each segment connecting rod according to the formula (102). 连接杆Y By employing the above technical solution, segmenting the analysis results can improve the accuracy of the calculation results. In specific implementation, the preset step size can be determined based on the tire's vertical travel distance. The tire's vertical travel distance is divided into multiple segments according to the preset step size, and the simulation analysis described above simulates at least one complete tire vertical travel distance. In specific implementation, the F value corresponding to each segment point can be calculated based on the coordinate parameters of the upper and lower connection points on the connecting rod at each segment point. 连接杆Y Comparison of multiple F 连接杆Y To obtain F 连接杆Y The maximum value.

[0037] In some embodiments, S3: with F 抱紧力 The maximum value of F is used as the design requirement for the clamping force when selecting or designing the rubber bushing. To meet the design requirement of preventing Y-axis movement of the stabilizer bar and rubber bushing, the clamping force design must consider durability degradation, i.e., F. 抱紧力 ≥F 衬套Ymax +F 耐久 , of which F 衬套Ymax F represents the maximum Y-axis force exerted by the rubber bushing on the stabilizer bar during tire bounce. 耐久 This refers to the damping force of the rubber bushing.

[0038] The following is combined Figure 1 and Figure 2 This explains the principle behind the above-mentioned design method for the clamping force of the rubber bushing of the automotive suspension stabilizer bar.

[0039] When a car goes over a speed bump or similar protrusion, the tire 5 moves upward, causing the front strut assembly 6 and the connecting rod 2 to move upward as well. At this time, because the angle between the connecting rod 2 and the stabilizer bar 1 is not 90°, the stabilizer bar 1 will be subjected to an upward pulling force from the connecting rod 2.

[0040] When a car travels over potholes or other uneven surfaces, the tire 5 moves downwards, causing the front strut assembly 6 and connecting rod 2 to move downwards as well. Similarly, when the angle between the connecting rod 2 and the stabilizer bar 1 is not 90°, the stabilizer bar 1 experiences a downward pulling force from the connecting rod 2. This oblique force can be decomposed into X, Y, and Z components. The Z-axis force is the force that causes the stabilizer bar 1 to twist, and the Y-axis force is the force that pushes or pulls the stabilizer bar 1 to move erratically.

[0041] Based on the principles of tribology, for two objects to come into contact, a normal force must be present to press them together. Since no two surfaces are perfectly flat, the contact point occurs only at the highest points of each other's surfaces. The presence of this normal force causes these highest points to deform under pressure until the contact pressures of the two surfaces reach equilibrium, locking them together. This process is friction. Because the stabilizer bar 1 is made of metal and the rubber bushing 3 is made of rubber, and their assembly is an interference fit, a normal force is inevitably present. Therefore, friction will occur between the two material surfaces. Long-term pressure and friction will lead to permanent deformation and even wear, causing a decrease in the clamping force and durability of the rubber bushing 3. The durability decrease of the rubber bushing 3 is strongly correlated with the material properties of the rubber bushing 3; different materials have different decay characteristics, resulting in different levels of decay.

[0042] The following is combined Figure 1 and Figure 2 Explain the derivation process of the above formulas (102) and (101).

[0043] The derivation of the above formula (102) includes a first stage and a second stage:

[0044] The first stage involves a force balance analysis under extreme conditions: Assuming that under the extreme condition of sudden impact, before the Y-direction force is transmitted from the impacted side to the other side, only the rubber bushing 3 on the impacted side bears the impact force. Based on the theoretical foundation that the force direction of a two-force member must pass through the member's axis, the force balance analysis yields the following:

[0045]

[0046] Therefore, we can conclude that: F 衬套Y =F 连接杆Y ,

[0047] Among them, F 衬套Y This is the Y-axis component of the force exerted by the rubber bushing on the stabilizer bar 1 during the up-and-down movement of tire 5, i.e., F. 衬套Y For F 衬套 The Y-axis component, F 衬套X This is the X-axis component of the force exerted by the rubber bushing on the stabilizer bar 1 during the up-and-down movement of tire 5, i.e., F. 衬套X For F 衬套 The X-axis component, F 衬套Z This is the Z-axis component of the force exerted by the rubber bushing on the stabilizer bar 1 during the up-and-down movement of tire 5, i.e., F. 衬套Z For F 衬套 Z-axis component of force; F 连接杆Y It is the Y-axis component of the force on connecting rod 2 during the up-and-down movement of tire 5, i.e., F. 连接杆Y For F 连接杆 The Y-axis component, F 连接杆X It is the X-axis component of the force on connecting rod 2 during the up-and-down movement of tire 5, i.e., F. 连接杆X For F 连接杆 The X-axis component, F 连接杆Z It is the Z-axis component of the force on connecting rod 2 during the up-and-down movement of tire 5, i.e., F. 连接杆Z For F 连接杆 Z-axis component of force; F 稳定杆Y It is the Y-axis component of the tension force exerted on the stabilizer bar 1 by the connecting rod 1 during the up-and-down bouncing of tire 5, i.e., F. 稳定杆Y For F 稳定杆 The Y-axis component, F 稳定杆X It is the X-axis component of the tension force exerted on the stabilizer bar 1 by the connecting rod 1 during the up-and-down bouncing of tire 5, i.e., F. 稳定杆X For F 稳定杆 The X-axis component, F 稳定杆Z It is the Z-axis component of the tension force exerted on the stabilizer bar 1 by the connecting rod 1 during the up-and-down bouncing of tire 5, i.e., F. 稳定杆Z For F 稳定杆 The Z-axis component force.

[0048] In the second stage, the theoretical force analysis of the rubber bushing 3 is as follows: Given the linear stiffness K of the stabilizer bar 1, the coordinates of the connection point 21 on the connecting rod are (x... A ,y A ,z A The coordinates of the lower connection point 22 of the connecting rod are (x... B ,y B ,z B ), d z =z A -z B ,d y =y A -y B The z-direction displacement of the lower connection point 22 of the connecting rod is dz. B Let |AB| be the length of connecting rod 2. Calculate F. 连接杆Y The process is as follows:

[0049] ∵

[0050] ∴

[0051] ∵ And F 连接杆Z =F 稳定杆Z =K·dz B

[0052] ∴

[0053] Where K is the linear stiffness of stabilizer bar 1, and dz B For the Z-axis displacement of the lower connection point 22 of the connecting rod, y A Let z be the Y-coordinate value of connection point 21 on the connecting rod. A Let y be the Z-coordinate value of connection point 21 on the connecting rod. B Let z be the Y-coordinate value of the lower connection point 22 of the connecting rod. B Here is the Z-coordinate value of the lower connection point 22 of the connecting rod.

[0054] The derivation of the above formula (101) is as follows:

[0055] Since the stabilizer bar 1 is made of metal and the rubber bushing 3 is made of rubber, and their assembly is an interference fit, there will inevitably be normal pressure. Therefore, friction will occur between the surfaces of the two materials. Long-term pressure and friction will lead to permanent deformation and even wear, causing a durability decrease in the clamping force of the rubber bushing 3. The decrease in the clamping force of the rubber bushing 3 is strongly correlated with the material properties of the rubber; different materials have different decrease characteristics. By substituting the decrease rate u of the material used for the rubber bushing 3, the decrease force F of the rubber bushing can be obtained. 耐久 =uF 抱紧力 Taking into account the damping force, F 抱紧力 The expression is as follows:

[0056] F 抱紧力 =F 衬套Y +F 耐久 =F 衬套Y +uF 抱紧力 .

[0057] This invention proposes a more precise and reliable method for designing the clamping force of the rubber bushing of the automotive suspension stabilizer bar. This method can reduce the risk of relative movement between the stabilizer bar and the rubber bushing in the early stages of design, thereby reducing the risk of abnormal noise and interference at the stabilizer bar. It provides a simple and feasible technical support for the forward design of automotive suspension systems.

[0058] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A method of designing a grip force of a rubber bushing of a stabilizer bar of an automobile suspension, characterized by, Includes the following steps: S1: Calculate the Y-axis component of the force acting on the connecting rod during the tire's vertical bounce. ; S2: Calculate the clamping force of the rubber bushing according to formula (101). : （101） in, This represents the Y-axis component of the force exerted by the rubber bushing on the stabilizer bar during the tire's vertical movement. The attenuation rate of the rubber bushing material is given. Furthermore, under extreme conditions of sudden impact, before the Y-direction force is transmitted from the impacted side to the other side, only the rubber bushing on the impacted side bears the impact force. Based on the theoretical foundation that the force direction of a two-force member must pass through the member's axis, this is derived from force equilibrium analysis. ; S1 further includes the following steps: S101: The analysis results of the tire's vertical bounce process are obtained through simulation analysis. The analysis results include the coordinate parameters of the upper connection point of the connecting rod and the coordinate parameters of the lower connection point of the connecting rod. S102: Based on the analysis results, calculate the Y-axis component of the force on the connecting rod during the tire's vertical jump according to formula (102). : （102） in, For the linear stiffness of the stabilizer bar, This refers to the Z-axis displacement of the lower connection point of the connecting rod. This represents the Y-coordinate of the connection point on the connecting rod. The Z-coordinate value of the connection point on the connecting rod. This represents the Y-coordinate of the lower connection point of the connecting rod. This is the Z-coordinate value of the lower connection point of the connecting rod.

2. The method for designing the clamping force of the rubber bushing of the automotive suspension stabilizer bar according to claim 1, characterized in that, S101 includes the following steps: building an assembly digital model of the suspension system using 3D modeling software, and performing simulation analysis using a mechanism motion module to simulate the tire's up-and-down jumping process.

3. The method for designing the clamping force of the rubber bushing of the automotive suspension stabilizer bar according to claim 1, characterized in that, S102 includes the following steps: dividing the analysis results into segments with a preset step size, and calculating the Y-axis component force on each segment connecting rod according to the formula (102). .

4. The method for designing the clamping force of the rubber bushing of the automotive suspension stabilizer bar according to claim 1, characterized in that, It also includes the following steps: S3: with The maximum value is used as the design requirement value for clamping force when selecting or designing the rubber bushing.

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