A wheel camber angle accuracy optimization system

Abstract

A system for optimizing the accuracy of wheel camber angle, characterized by the following steps: Step S1: Obtain the physical structure of the suspension and build an analysis model based on the physical structure of the suspension; Step S2: Obtain the involved tolerances of the parts, and analyze the camber angle tolerance of the cumulative influence of the involved dimension chains of the parts through simulation software; Step S3: According to the sensitivity analysis of the suspension parts, find one or more control arm mounting points that have a greater impact on the camber angle, and conduct the mating design of the control arm assembly position; Step S4: Set an implementation unit to ensure that the hole position mating design can effectively compensate for the influence of the part tolerances on the camber angle during the sub-assembly stage of the suspension parts, so that the camber angle can be maintained within the required tolerance range after the sub-assembly is completed; reduce the part cost, have strong versatility, and meet the high-precision requirements of the camber angle.

Description

Technical Field

[0001] The present invention relates to a vehicle suspension system, and more particularly to a system for optimizing the accuracy of wheel camber angle. Background Art

[0002] With the increasing requirements for vehicle performance, engineers' requirements for camber angle tolerance are also gradually increasing. At the same time, the requirement for improving the consistency of camber angles between the left and right wheels has also become a focus of increasing attention. The consistency of camber angles between the left and right wheels plays a crucial role in a performance-oriented chassis system, affecting vehicle handling stability such as straight-line stability and left-right response during steering. Therefore, how to improve the accuracy of camber angle and the consistency of left and right camber angles has become an urgent problem for engineers to solve.

[0003] Currently, suspensions for camber angle adjustment are divided into non-adjustable structures and adjustable structures, and their characteristics are as follows: For non-adjustable structures, the camber angle is not adjustable, which requires high manufacturing precision of parts, increases costs and often fails to achieve good results. Moreover, currently, domestic parts suppliers have limited technology and it is difficult to meet the requirements; For adjustable structures, the corresponding mounting point bolts of the control arm are changed to a combination of bolts and eccentric washers for adjustment. This method reduces the requirements for dimensional accuracy of parts, but correspondingly, it will greatly increase the chassis cost, and may affect other alignment parameters such as toe-in when adjusting the camber angle of the four-wheel alignment. The process is relatively cumbersome, time-consuming and laborious.

[0004] For example, an "outer camber angle adjustment device" disclosed in a Chinese patent document with the publication number CN102821986A has problems such as being unable to achieve high precision while increasing costs, affecting the vehicle loading efficiency, and having a large difference between the vehicle off-line and the theory. Summary of the Invention

[0005] The existing longitudinal push rod assembly structure has the following disadvantages:

[0006] 1. For traditional suspension systems, for cost considerations, the camber angle is generally set to be non-adjustable, and the camber angle accuracy is ensured solely by controlling the manufacturing tolerances of suspension parts. However, this method requires extremely high manufacturing processes, increases costs and often fails to achieve good results;

[0007] 2. Currently, most luxury models set the camber angle to be adjustable through eccentric bolts to improve the camber angle accuracy. This method increases the chassis cost relatively much;

[0008] 3. Adjusting the camber angle through eccentric bolts often affects other alignment parameters such as toe-in. The adjustment process is relatively cumbersome, time-consuming and laborious, affecting the vehicle loading rhythm;

[0009] 4. The traditional chassis assembly process cannot effectively guarantee the wheel alignment parameters. After the vehicle rolls off the production line, there is a large difference from the theory, and the alignment parameters often need to be adjusted during four-wheel alignment.

[0010] The present invention provides a system for optimizing the accuracy of camber angle. By optimizing the camber angle consistency through the design of front suspension parts and the optimization of the later assembly process, higher camber angle accuracy can be obtained with less development and labor costs without increasing the tolerance requirements of parts.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A system for optimizing the accuracy of camber angle, characterized by comprising the following steps:

[0013] Step S1: Obtain the physical structure of the suspension and build an analysis model based on the physical structure of the suspension;

[0014] Step S2: Obtain the involved tolerances of the parts, and analyze the camber angle tolerance of the cumulative influence of the involved dimension chains of the parts through simulation software;

[0015] Step S3: According to the sensitivity analysis of the suspension parts, find one or more control arm mounting points that have a greater influence on the camber angle, and conduct the mating design of the control arm assembly position;

[0016] Step S4: Set an implementation unit to ensure that the hole position mating design can effectively compensate for the influence of the part tolerances on the camber angle during the sub-assembly stage of the suspension parts, so that the camber angle can remain within the required tolerance range after the sub-assembly is completed.

[0017] Preferably, Step S1 includes the following content:

[0018] Use wheel data, wheel suspension physical data, body data, and GD&T-related information to perform 3DCS simulation calculations to obtain a matching model of the wheel, wheel suspension, and body for building an analysis model of the physical structure.

[0019] Furthermore, the implementation unit includes a main body supporting structure, an upper adjustment platform, a lower adjustment platform, and guide rails. The main body supporting structure is rigidly connected to the upper adjustment platform; the lower adjustment platform is provided with guide rails that cooperate with the bearings on the upper adjustment platform; the lower adjustment platform is provided with bearings that cooperate with the guide rails; the implementation unit improves the accuracy of the camber angle by constraining the relative position of the brake during the rear suspension sub-assembly process and in cooperation with the brake. The main body supporting structure can be replaced according to the positioning parameters of different vehicle models, and the implementation unit can achieve six-way adjustment of up and down, inside and outside, front and back according to the wheelbase and track width of different vehicle models, with extremely high versatility.

[0020] Furthermore, the upper part of the main body supporting structure is provided with a U-shaped groove and a semi-circular groove, which cooperate with the brake assembly to restrict the wheel positioning parameters; the lower part is provided with bolt holes, which are assembled with the upper adjustment platform through nuts to play a fixing role; the inner side is provided with a supporting platform, which cooperates with the brake to play a role in restricting positioning.

[0021] Furthermore, there are guide rails on the lower adjustment platform, and the guide rails are fixed through mounting brackets; bearings are provided at the lower part, which can move back and forth in cooperation with the guide rails to optimize the caster angle consistency in the early-stage suspension part design and the later assembly process. Without raising the part tolerance requirements, higher caster angle accuracy can be obtained with less development and labor costs.

[0022] Therefore, the present invention has the following beneficial effects:

[0023] 1. By building a model, calculating the caster angle tolerance through the dimension chain, optimizing the hole position matching design to meet the required caster angle accuracy, and implementing unit control of the caster angle accuracy, etc., the caster angle accuracy can be improved to a relatively high level while occupying less part costs;

[0024] 2. By sensitivity analysis, find the control arm mounting points that have a greater impact on the caster angle, optimize the hole position matching design for them, iterate and analyze again, and optimize multiple times until the caster angle accuracy requirements are met;

[0025] 3. During the suspension sub-assembly process, effectively ensure the position of the brake mounting plane, and cooperate with the hole position design method of the suspension mounting points to correct the adverse effects caused by excessive part manufacturing tolerances, so as to achieve the purpose of optimizing the caster angle accuracy, and it has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of an implementation unit of the present invention;

[0027] Figure 2 is a schematic structural diagram of the main body supporting structure of the present invention;

[0028] Figure 3 is a schematic structural diagram of the upper adjustment platform of the present invention;

[0029] Figure 4 is a schematic structural diagram of the lower adjustment platform of the present invention;

[0030] Figure 5 is a schematic overall structural diagram of a device of the present invention.

[0031] Wherein: 1. Main body supporting structure; 2. Upper adjusting platform; 3. Lower adjusting platform; 4. Guide rail; 201. Stud; 202. Upper adjusting platform tabletop; 203. Upper adjusting platform bearing; 301. Connecting guide rail; 302. Mounting support; 303. Lower adjusting platform tabletop; 304. Lower adjusting platform bearing. Specific embodiments

[0032] The present invention will be further specifically described below in conjunction with the accompanying drawings and specific embodiments.

[0033] In view of the current situation that only one of the camber cost and accuracy of the suspension system can be selected, the present invention provides a camber accuracy optimization system, which can improve the camber accuracy to a relatively high level while occupying less part cost through four modules: building a model, calculating the camber tolerance through a dimension chain, optimizing the hole position fit design to meet the required camber accuracy, and implementing unit control of the camber accuracy.

[0034] A wheel camber accuracy optimization system, characterized by including the following steps:

[0035] Step S1: Obtain the physical structure of the suspension, build an analysis model according to the physical structure of the suspension, and perform 3DCS simulation calculations using wheel data, wheel suspension physical data, body data, and GD&T-related information to obtain a matching model of the wheel, wheel suspension, and body for building the analysis model of the physical structure;

[0036] Step S2: Obtain part tolerances, and calculate the cumulative camber tolerance by inputting part tolerances inside the built model.

[0037] Step S3: According to the sensitivity analysis of the suspension parts, find one or more control arm mounting points that have a greater impact on the camber, and perform control arm assembly position fit design on them, specifically including the following steps:

[0038] Step S31: Appropriately enlarge the control arm mating installation hole diameter through calculation and analysis;

[0039] Step S32: Reserve the vehicle body Y-direction adjustment gap;

[0040] Step S33: Correct the camber deviation caused by the large manufacturing tolerances of the parts;

[0041] Through sensitivity analysis, find one or more control arm mounting points that have a greater impact on the camber, perform hole position fit optimization design on them, iterate and analyze again, and optimize multiple times until the required camber accuracy is met.

[0042] Among them, the hole position fit design is shown in Table 1. In theory, this fit can provide at least 0.35 mm of Y-direction adjustment gap to optimize the camber deviation caused by part tolerances.

[0043] Table 1

[0044]

[0045] Step S4: Set an implementation unit to ensure that during the sub-assembly stage of the suspension parts, the hole position matching design can effectively compensate for the camber angle influence caused by part tolerances, so that the camber angle can be maintained within the required tolerance range after sub-assembly, and the accuracy of the camber angle is controlled by the implementation unit.

[0046] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, the implementation unit includes a main body supporting structure 1, an upper adjustment platform 2, a lower adjustment platform 3, and a guide rail 4. The main body supporting structure 1 is rigidly connected to the upper adjustment platform 2 through nuts; there is a guide rail 301 on the lower adjustment platform 3, which cooperates with the bearing 203 on the upper adjustment platform; there is a bearing 304 under the lower adjustment platform 3, which cooperates with the moving guide rail 4; the implementation unit restricts the relative position of the brake during the rear suspension sub-assembly process and cooperates with the brake to improve the accuracy of the camber angle, as Figure 5 shown. The main body supporting structure 1 can be replaced according to the positioning parameters of different vehicle models, and the implementation unit can achieve six-way adjustment of up and down, inside and outside, front and back according to the wheelbase and track width of different vehicle models, with extremely high versatility.

[0047] Furthermore, there are grooves 102 and semi-circular grooves 101 on the upper part of the main body supporting structure 1, which cooperate with the brake assembly to restrict the wheel positioning parameters; there are bolt holes 106 on the lower part, which are assembled with the studs 201 on the upper adjustment platform 2 through nuts to play a fixing role; there is a supporting platform 103 on the inner side.

[0048] Furthermore, there is a guide rail 301 on the lower adjustment platform 3, and the guide rail 301 is fixed through a mounting bracket 302; there is a bearing 304 on the lower part, which can move smoothly back and forth in cooperation with the moving guide rail 4.

[0049] The working principle of the present invention: By sensitivity analysis, find the control arm mounting points that have a greater impact on the camber angle, optimize the hole position matching design for them, iterate and analyze again, and optimize multiple times until the camber angle accuracy requirements are met. During the suspension sub-assembly process, effectively ensure the position of the brake installation plane, and cooperate with the hole position design method of the suspension mounting points to correct the adverse effects caused by excessive part manufacturing tolerances, so as to achieve the purpose of optimizing the camber angle accuracy. At the same time, the main body supporting structure of the implementation unit can be replaced according to the positioning parameters of different vehicle models, and six-way adjustment of up and down, inside and outside, front and back can be achieved according to the wheelbase and track width of different vehicle models, with extremely high versatility.

[0050] The above embodiments are only a preferred solution of the present invention and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. An optimization system for the accuracy of wheel camber angle, characterized in that, It includes the following steps: Step S1: Obtain the physical structure of the suspension and build an analysis model based on the physical structure of the suspension; Step S2: Obtain the design tolerances of the parts, and analyze the camber tolerances of the cumulative effects of the calculated part design dimension chains through simulation software; Step S3: According to the sensitivity analysis of the suspension parts, find one or more control arm mounting points that have a greater impact on the camber, and perform the mating design of the control arm assembly position for them; Step S4: Set up an implementation unit to ensure that the hole position mating design can effectively compensate for the camber influence caused by part tolerances during the sub-assembly stage of the suspension parts, so that the camber can be kept within the required tolerance range after the sub-assembly is completed; The implementation unit includes a main body supporting structure, an upper adjustment platform, a lower adjustment platform and a guide rail. The main body supporting structure is rigidly connected to the upper adjustment platform; there is a guide rail on the lower adjustment platform, which cooperates with the bearing on the upper adjustment platform. There is a bearing under the lower adjustment platform, which cooperates with the guide rail. The main body supporting structure includes the upper part and the lower part of the main body supporting structure. The upper part of the main body supporting structure is provided with a U-shaped groove and a semi-circular groove, which cooperate with the brake assembly to constrain the wheel positioning parameters. There is a supporting platform inside the main body supporting structure.

2. The wheel camber accuracy optimization system according to claim 1, characterized in that, Step S1 includes the following: Use wheel data, wheel suspension physical data, body data and GD&T related information for 3DCS simulation calculation to obtain the matching model of the wheel, wheel suspension and body to build an analysis model of the physical structure.

3. The wheel camber angle accuracy optimization system according to claim 1, characterized in that, Step S3 includes the following: Step S31: Appropriately enlarge the mating installation hole diameter of the control arm through calculation and analysis; Step S32: Reserve the vehicle body Y-direction adjustment clearance; Step S33: Correct the camber deviation caused by the large manufacturing tolerances of the parts.

4. The wheel camber angle accuracy optimization system according to claim 1, characterized in that Step S4 includes the following: The implementation unit is used to effectively guarantee the position of the brake installation plane during the suspension sub-assembly process, and cooperate with the hole position design method of the suspension installation point to correct the adverse effects caused by the excessive manufacturing tolerances of the parts, so as to achieve the purpose of optimizing the camber accuracy.

5. The optimized system for wheel camber angle accuracy according to claim 4, characterized in that The lower part of the main body supporting structure is provided with bolt holes and is assembled and connected to the upper adjustment platform through nuts.

6. The optimized system for the accuracy of wheel camber angle according to claim 4, characterized in that, There is a guide rail on the lower adjustment platform. The guide rail is fixed through a mounting bracket. There is a bearing under the lower adjustment platform, and it can slide and translate in cooperation with the guide rail.

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