Gauge and method for detecting assembly accuracy

Abstract

The application relates to a detection tool and a detection method for assembly accuracy. The detection tool comprises a frame simulation piece, an axle simulation piece and a balance suspension simulation piece, and the balance suspension simulation piece is installed between the frame simulation piece and the axle simulation piece. The balance suspension simulation piece can be replaced by a balance suspension piece to be detected, and the axle simulation piece can be replaced by an axle piece to be detected. The detection tool further comprises an adjusting structure arranged on the frame simulation piece, and the balance suspension simulation piece is connected to the frame simulation piece through the adjusting structure. The adjusting structure is configured to adjust the relative position between the balance suspension simulation piece or the balance suspension piece to be detected and the frame simulation piece, so that the balance suspension simulation piece or the balance suspension piece to be detected is installed at a preset position. The application can detect the assembly deviation of the balance suspension piece to be detected in the assembly process. Through the adjusting structure on the frame simulation piece, the frame simulation piece can be adapted to more size specifications, and the universality of the detection tool is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to methods for testing fixtures and assembly accuracy. Background Technology

[0002] Vehicle pulling to one side is a phenomenon where a car traveling straight on a flat road veers off course to one side, causing the line connecting the centers of the front and rear axles to deviate from the center line of its trajectory. The precision of the vehicle's suspension system is closely related to this problem.

[0003] Currently, the accuracy of balance suspension is mostly improved by increasing the manufacturing precision of components. However, when inspecting balance suspensions of different specifications, it is not only difficult to determine assembly deviations during the assembly process, but also difficult to improve the versatility of inspection tools. Summary of the Invention

[0004] Based on this, a fixture and assembly accuracy detection method are provided that can be adapted to various specifications of balance suspension and can detect deviations in the assembly process, so as to improve the versatility of the fixture and obtain the assembly deviation of the parts.

[0005] In one aspect of this application, a fixture is provided, which includes a vehicle frame simulator, an axle simulator, and a balance suspension simulator, wherein the balance suspension simulator is installed between the vehicle frame simulator and the axle simulator.

[0006] The balance suspension simulator can be replaced with the balance suspension test piece, and the axle simulator can be replaced with the axle test piece.

[0007] The fixture also includes an adjustment structure on the vehicle frame simulator, and the balance suspension simulator is connected to the vehicle frame simulator by means of the adjustment structure;

[0008] The adjustment structure is configured to adjust the relative position between the balance suspension simulator or the balance suspension test piece and the vehicle frame simulator, so that the balance suspension simulator or the balance suspension test piece is installed in a preset position.

[0009] In one embodiment, the adjustment structure includes a base and an adjustment member;

[0010] The base is mounted on the vehicle frame simulation component, and the adjustment component is used to connect with the balance suspension simulation component or the balance suspension test component;

[0011] The adjusting component is configured to move relative to the base in a first direction so that the balance suspension simulator or the balance suspension test component is installed in a preset position.

[0012] In one embodiment, the base has a receiving groove along a first direction, and the adjusting member is movably disposed in the receiving groove;

[0013] The base also has an opening along the second direction, which communicates with the receiving groove to expose the adjusting component;

[0014] The second direction is perpendicular to the first direction.

[0015] In one embodiment, the adjustment structure further includes a connector;

[0016] The connector is threaded between the base and the adjusting component.

[0017] In one embodiment, the balance suspension simulator includes a reaction rod simulator; the reaction rod simulator is connected between the adjustment structure and the axle simulator or the axle under test; or

[0018] The balanced suspension test component includes the reaction rod test component; the reaction rod test component is connected between the adjustment structure and the axle simulation component or the axle test component.

[0019] Another aspect of this application provides a method for detecting assembly accuracy, the method comprising:

[0020] The balance suspension simulator is assembled into a preset position on the chassis simulator in the fixture using an adjustment structure.

[0021] The axle simulator is assembled onto the balance suspension simulator;

[0022] Replace the balance suspension simulator with the balance suspension test piece, and / or replace the axle simulator with the axle test piece;

[0023] Assembly accuracy is determined based on the inspection tool.

[0024] In one embodiment, the balance suspension simulator is assembled onto a predetermined position on the vehicle frame simulator using an adjustment structure, specifically including:

[0025] The bracket and leaf spring components from the balance suspension simulator are assembled onto the vehicle frame simulator.

[0026] The reaction rod simulator in the balance suspension simulator is assembled onto the adjustment structure to be assembled to the preset position.

[0027] In one embodiment, the balance suspension simulator is replaced with the balance suspension test component, specifically including:

[0028] Replace the scaffold simulation with the scaffold test piece; and / or

[0029] Replace the leaf spring simulation with the leaf spring test piece; and / or

[0030] Replace the reaction rod simulator with the reaction rod test piece.

[0031] In one embodiment, before obtaining assembly accuracy based on the gauge, the method further includes:

[0032] A reference coordinate system is established based on the vehicle frame simulation component;

[0033] The vehicle frame simulation component has multiple reference holes along its circumference; all reference holes are coplanar to form a reference plane perpendicular to the first direction, and the reference plane and the first direction jointly establish a reference coordinate system.

[0034] In one embodiment, before replacing the balance suspension simulator with the balance suspension test piece, and / or replacing the axle simulator with the axle test piece, the method further includes:

[0035] Obtain the theoretical three-dimensional coordinates of the simulated positioning holes on the axle simulator; the axle simulator has multiple flange simulators, and each flange simulator has a simulated positioning hole.

[0036] Determining assembly accuracy based on fixtures specifically includes:

[0037] Without replacing the axle simulator with the axle test piece, the actual three-dimensional coordinates of the simulated positioning holes on the axle simulator are determined based on the reference coordinate system; or, with the axle simulator replaced with the axle test piece, the actual three-dimensional coordinates of the positioning holes to be measured on the axle test piece are determined based on the reference coordinate system; wherein, the axle test piece is provided with multiple flange test pieces, and each flange test piece is provided with a positioning hole to be measured.

[0038] Assembly accuracy is determined based on actual and theoretical three-dimensional coordinates.

[0039] The aforementioned fixtures and assembly accuracy testing methods include fixtures that at least comprise a frame simulator, an axle simulator, and a balance suspension simulator. By replacing the balance suspension simulator with the balance suspension test piece, or the axle simulator with the axle test piece, assembly deviations of the balance suspension test piece during assembly can be specifically detected. The adjustable structure on the frame simulator allows it to be adapted to a wider range of balance suspension simulators or test pieces of varying sizes, improving the fixture's versatility. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a testing fixture according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of an adjustment structure according to an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of a front upper reaction rod simulation component according to an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of a stent simulation component according to an embodiment of this application;

[0044] Figure 5 This is a schematic diagram of a simulated leaf spring according to an embodiment of this application;

[0045] Figure 6 This is a flowchart illustrating an embodiment of the assembly accuracy detection method of this application;

[0046] Figure 7 This is a flowchart illustrating a method for detecting assembly accuracy according to another embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100. Inspection fixture; 110. Chassis simulation component; 111. Reference hole; 112. Crossbeam; 120. Axle simulation component; 121. Flange simulation component; 122. Simulated positioning hole; 130. Balance suspension simulation component; 131. Reaction rod simulation component; 131a. Front upper reaction rod simulation component; 131b. Front lower reaction rod simulation component; 131c. Rear upper reaction rod simulation component; 131d. Rear lower reaction rod simulation component; 1 311. Large end; 1312. Small end; 1313. Pin; 1314. Nut; 132. Bracket simulation; 133. Leaf spring simulation; 133a. Leaf spring body simulation; 133b. Cover plate simulation; 133c. U-bolt; 140. Adjustment structure; 141. Base; 142. Adjustment component; 143. Connector; 150. First washer; 160. Second washer; Z, First direction. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0056] To facilitate understanding of the technical solution of this application, before proceeding with a detailed explanation, the assembly of the inspection fixture and the balance suspension in the related technologies will be described first.

[0057] As mentioned in the background section, domestic automakers generally control the dimensional accuracy of balance suspension systems primarily by focusing on the manufacturing precision of individual components. However, even when all components pass inspection, the aforementioned problems still occur. The inventors investigated the root cause and discovered that during the assembly of qualified parts into a balance suspension system, the accumulation of deviations is unavoidable. This cumulative effect can lead to out-of-tolerance parameters in the final assembled balance suspension system. Under current conditions, this out-of-tolerance issue cannot be effectively controlled, and it is difficult to specifically inspect the conformity of the assembled components, making in-depth analysis of the out-of-tolerance problem challenging. Furthermore, there is a lack of analytical methods for the dimensional tolerance fit of balance suspension system components, making it difficult to solve the aforementioned problems by optimizing dimensional chain tolerances. It should also be noted that current inspection tools mostly use general-purpose measuring tools to measure the assembled balance suspension system, making it difficult to accurately measure assembly deviations using three-dimensional coordinate dimensions. It is also difficult to compare the cumulative effect of manufacturing deviations of each component during assembly, and the contribution of each component's deviation to the final assembly deviation.

[0058] Therefore, it is necessary to propose a testing method for fixtures and assembly accuracy that can improve the above problems.

[0059] For ease of description, the accompanying drawings only show structures relevant to embodiments of this application.

[0060] Figure 1 A schematic diagram of a gauge 100 according to an embodiment of this application is shown.

[0061] See Figure 1An embodiment of this application provides a fixture 100, which includes a vehicle frame simulator 110, an axle simulator 120, and a balance suspension simulator 130. The balance suspension simulator 130 is mounted between the vehicle frame simulator 110 and the axle simulator 120. The balance suspension simulator 130 can be replaced with a balance suspension test piece, and the axle simulator 120 can be replaced with an axle test piece. The fixture 100 also includes an adjustment structure 140 disposed on the vehicle frame simulator 110, and the balance suspension simulator 130 is connected to the vehicle frame simulator 110 by means of the adjustment structure 140. The adjustment structure 140 is configured to adjust the relative position between the balance suspension simulator 130 or the balance suspension test piece and the vehicle frame simulator 110, so that the balance suspension simulator 130 or the balance suspension test piece is mounted in a preset position.

[0062] The inspection fixture 100 provided in this application includes at least a frame simulator 110, an axle simulator 120, and a balance suspension simulator 130. By replacing the balance suspension simulator 130 with a balance suspension test piece, or replacing the axle simulator 120 with an axle test piece, assembly deviations of the balance suspension test piece during assembly can be specifically detected. With the help of the adjustment structure 140 on the frame simulator 110, the frame simulator 110 can be adapted to more balance suspension simulators 130 or balance suspension test pieces of different sizes and specifications, improving the versatility of the inspection fixture 100.

[0063] It should be noted that the chassis simulation component 110 is mounted on a flat surface, such as the ground, to ensure the stability of the fixture 100. It should also be noted that when the balance suspension simulation component 130 or the balance suspension test component is assembled onto the chassis simulation component 110, the adjustment structure 140 allows the balance suspension simulation component 130 or the balance suspension test component to be assembled into a preset position corresponding to that on the actual vehicle.

[0064] Figure 2 A schematic diagram of the adjustment structure 140 in one embodiment of this application is shown.

[0065] like Figure 2 As shown, and in combination Figure 1 In some embodiments, the adjustment structure 140 includes a base 141 and an adjustment member 142. The base 141 is disposed on the vehicle frame simulation member 110, and the adjustment member 142 is used to connect with the balance suspension simulation member 130 or the balance suspension test member. The adjustment member 142 is configured to move relative to the base 141 in a first direction Z to mount the balance suspension simulation member 130 or the balance suspension test member in a preset position. Thus, by adjusting the position of the adjustment member 142 relative to the base 141, the mounting position of the balance suspension simulation member 130 or the balance suspension test member can be adjusted.

[0066] In some specific embodiments, the base 141 has a receiving groove along the first direction Z, and the adjusting member 142 is movably disposed within the receiving groove. The base 141 also has an opening along a second direction, which communicates with the receiving groove to expose the adjusting member 142. The second direction is perpendicular to the first direction Z. Thus, the receiving groove can accommodate the adjusting member 142, and the opening communicating with the receiving groove can expose the adjusting member 142, thereby making it easier for the adjusting member 142 to connect with the balance suspension simulator 130 or the balance suspension test piece.

[0067] Please continue reading. Figure 2 Furthermore, the adjustment structure 140 also includes a connector 143, which is threadedly connected between the base 141 and the adjustment member 142. Thus, by rotating the connector 143, the rotational motion can be converted into linear motion of the adjustment member 142 via the thread, thereby adjusting the relative position between the adjustment member 142 and the base 141. Specifically, in the embodiments of this application, the frame simulation member 110 includes a crossbeam 112, and the adjustment structure 140 is disposed on the crossbeam 112. Specifically, the base 141 is disposed on the crossbeam 112.

[0068] Figure 3 A schematic diagram of a front upper reaction rod simulator 131a according to an embodiment of this application is shown.

[0069] like Figure 3 As shown, in some embodiments, the balance suspension simulator 130 includes a reaction rod simulator 131, which is connected between the adjustment structure 140 and the axle simulator 120 or the axle under test. Thus, the theoretical installation positions of each component can be determined by the interaction of the balance suspension simulator 130, the axle simulator 120, and the frame simulator 110. Furthermore, the assembly deviation of the axle under test can be determined by the interaction of the balance suspension simulator 130 and the frame simulator 110. In still other embodiments, the balance suspension under test includes a reaction rod under test, which is connected between the adjustment structure 140 and the axle simulator 120 or the axle under test. Thus, the assembly deviation of the reaction rod under test can be determined.

[0070] It should be noted that the reaction rod simulation component 131 includes a front upper reaction rod simulation component 131a, a front lower reaction rod simulation component 131b, a rear upper reaction rod simulation component 131c, and a rear lower reaction rod simulation component 131d. Correspondingly, the reaction rod test components include the front upper reaction rod test component, the front lower reaction rod test component, the rear upper reaction rod test component, and the rear lower reaction rod test component. During replacement, the assembly deviation of a single part, i.e., the influence of the manufacturing error of a single part on the assembly, can be determined by replacing any one of them. Alternatively, all parts can be replaced to determine the assembly deviation of the entire reaction rod test component.

[0071] The front upper reaction rod simulator 131a has a large end 1311 and a small end 1312. The large end 1311 is used to connect with the axle simulator 120 or the axle under test, and the small end 1312 is used to connect with the adjusting member 142 in the adjusting structure 140. The large end 1311 and the small end 1312 have similar structures, taking the large end 1311 as an example. The large end 1311 has a pin 1313 and a nut 1314. The pin 1313 is configured to rotate about the axial direction to adjust the angle and adapt to different installation positions. The nut 1314 is used to fix the pin 1313 after it is adjusted to a preset angle. In conjunction with the foregoing, the small end 1312 can also be adjusted in installation position by rotating the pin 1313. It should also be noted that this application only takes the large end 1311 of the front upper reaction rod simulation component 131a as an example. Correspondingly, the front lower reaction rod simulation component 131b, the rear upper reaction rod simulation component 131c and the rear lower reaction rod simulation component 131d, as well as the front upper reaction rod test component, the front lower reaction rod test component, the rear upper reaction rod test component and the rear lower reaction rod test component can also adjust their installation posture by means of this structure.

[0072] Figure 4 A schematic diagram of a support model 132 in one embodiment of this application is shown; Figure 5 A schematic diagram of a leaf spring simulator 133 according to one embodiment of this application is shown.

[0073] like Figure 4 and Figure 5 As shown, and in combination Figure 1 In conjunction with some embodiments described later, the balance suspension simulator 130 also includes a bracket simulator 132 and a leaf spring simulator 133. Correspondingly, the balance suspension test component also includes a bracket test component and a leaf spring test component. Similarly, by replacing any single part, the assembly deviation of the individual part, that is, the influence of the manufacturing error of the individual part on the assembly, can be determined. Alternatively, all parts can be replaced to determine the cumulative effect of the manufacturing deviation of the parts on the assembly throughout the entire assembly process. It should be noted that the bracket simulator 132 is provided with a first shim 150, and the installation position of the front lower reaction rod simulator 131b, the rear lower reaction rod simulator 131d, the front lower reaction rod test component, or the rear lower reaction rod test component can be adjusted by adding or removing the first shim 150.

[0074] Furthermore, the leaf spring simulation component 133 includes a leaf spring body simulation component 133a and a cover plate simulation component 133b. Correspondingly, the leaf spring test component includes a leaf spring body test component and a cover plate test component. The leaf spring body simulation component 133a and the cover plate simulation component 133b are connected by a U-bolt 133c. The leaf spring body simulation component 133a is provided with a second shim 160, and the arc height of the leaf spring body simulation component 133a can be adjusted by adding or removing the second shim 160.

[0075] Figure 6 A flowchart illustrating an assembly accuracy detection method according to an embodiment of this application is shown.

[0076] like Figure 6 As shown, and in combination Figure 1 Based on the same inventive concept, another aspect of this application provides a method for detecting assembly accuracy, the method comprising:

[0077] S110, The balance suspension simulator 130 is assembled into a preset position on the frame simulator 110 in the fixture 100 by means of the adjustment structure 140;

[0078] S120. Assemble the axle simulator 120 onto the balance suspension simulator 130.

[0079] S130, Replace the balance suspension simulator 130 with the balance suspension test piece, and / or replace the axle simulator 120 with the axle test piece;

[0080] S140. Determine assembly accuracy based on gauge 100.

[0081] In steps S110 and S120, the preset position refers to the location where the balance suspension is mounted on the chassis in a real vehicle. Thus, by assembling the balance suspension simulator 130 to the preset position, the assembly position of the real vehicle can be simulated, ensuring testing accuracy.

[0082] In steps S130 and S140, when the balance suspension simulator 130 is replaced with the balance suspension test component, but the axle simulator 120 is not replaced with the axle test component, the influence of the manufacturing error of the balance suspension test component on the assembly deviation can be determined to determine the assembly accuracy. When the axle simulator 120 is replaced with the axle test component, but the balance suspension simulator 130 is not replaced with the balance suspension test component, the influence of the manufacturing error of the axle test component on the assembly deviation can be determined to determine the assembly accuracy. When the balance suspension simulator 130 is replaced with the balance suspension test component, and the axle simulator 120 is replaced with the axle test component, the influence of the cumulative effect of each part during the assembly process on the assembly can be determined to determine the assembly accuracy.

[0083] Figure 7A flowchart illustrating a method for detecting assembly accuracy according to another embodiment of this application is shown.

[0084] like Figure 7 As shown, and in combination Figure 1 In some embodiments, step S110 specifically includes:

[0085] S111. Assemble the bracket simulation component 132 and the leaf spring simulation component 133 in the balance suspension simulation component 130 onto the vehicle frame simulation component 110.

[0086] S112. The reaction rod simulation 131 in the balance suspension simulation 130 is assembled onto the adjustment structure 140 by means of the adjustment structure 140 to be assembled to a preset position.

[0087] In steps S111 and S112, after the bracket simulation component 132 and the leaf spring simulation component 133 are assembled, the reaction rod simulation component 131 is assembled to the preset position by means of the adjustment structure 140 with the position adjusted, thus completing the assembly of the balance suspension simulation component 130.

[0088] In some embodiments, the balance suspension simulator 130 is replaced with a balance suspension test component, specifically including replacing the bracket simulator 132 with the bracket test component, and / or replacing the leaf spring simulator 133 with the leaf spring test component, and / or replacing the reaction rod simulator 131 with the reaction rod test component. It is understood that a single part of the balance suspension simulator 130 can be replaced individually, for example, replacing the bracket simulator 132, leaf spring simulator 133, or reaction rod simulator 131 with the bracket test component, leaf spring test component, or reaction rod test component respectively, to determine the impact of manufacturing errors of a single part on assembly deviations. Alternatively, all parts in the balance suspension simulator 130 can be replaced to determine cumulative deviations.

[0089] Continue reading Figure 7 In some embodiments, before step S140, a reference coordinate system is established based on the chassis simulation component 110. The chassis simulation component 110 has multiple reference holes 111 formed circumferentially. All reference holes 111 are coplanar to form a reference plane perpendicular to the first direction Z, and the reference plane and the first direction Z together establish the reference coordinate system. Thus, by establishing the reference coordinate system through the reference holes 111 on the chassis simulation component 110, the three-dimensional coordinates of each part can be determined, improving the accuracy and ease of precision determination.

[0090] The inventors discovered that if there are fewer than six datum holes 111, there is a defect in the establishment of the datum coordinate system, affecting the accuracy of assembly deviation determination. Based on this, and in conjunction with... Figure 1As shown, the chassis simulation component 110 has six reference holes 111 along its circumference. Furthermore, the chassis simulation component 110 has three evenly spaced reference holes 111 on each of its opposite longitudinal sides.

[0091] In some embodiments, prior to step S130, the method further includes:

[0092] S125. Obtain the theoretical three-dimensional coordinates of the simulated positioning hole 122 on the axle simulation component 120. The axle simulation component 120 is provided with multiple flange simulation components 121, and each flange simulation component 121 is provided with a simulated positioning hole 122.

[0093] Step S140 specifically includes:

[0094] S141. Without replacing the axle simulation component 120 with the axle test component, determine the actual three-dimensional coordinates of the simulated positioning hole 122 on the axle simulation component 120 based on the reference coordinate system; or, with the axle simulation component 120 replaced with the axle test component, determine the actual three-dimensional coordinates of the positioning hole to be measured on the axle test component based on the reference coordinate system; wherein, the axle test component is provided with multiple flange test components, and each flange test component is provided with a positioning hole to be measured.

[0095] S142. Determine assembly accuracy based on actual three-dimensional coordinates and theoretical three-dimensional coordinates.

[0096] In step S125, the theoretical installation positions of each component are first determined using the simulated positioning holes 122 on the axle simulator 120. It should be noted that the flange on the axle is used to mount the wheels. In this application, the three-dimensional coordinates of the wheel center in the actual vehicle can be determined by determining the three-dimensional coordinates of the simulated positioning holes 122 on the flange simulator 121. Specifically, the simulated positioning holes 122 are concentric with the flange simulator 121.

[0097] In steps S141 and S142, without replacing the axle simulator 120, at least one part of the balance suspension simulator 130 can be replaced during the testing process. This allows for the determination of the impact of manufacturing deviations of individual parts on the final assembly, including the bracket, leaf spring, or reaction rod parts in the balance suspension simulator, in addition to the axle test component. Furthermore, the cumulative deviations of all parts on the assembly can also be determined. When replacing the axle simulator 120, it is understood that not only the balance suspension test component but also the axle test component can be tested.

[0098] Combination Figures 1 to 7As shown, exemplarily, and in conjunction with some of the foregoing embodiments, the influence of manufacturing deviations of the bracket test piece on assembly deviations will be explained as an example. A coordinate system is established using the reference hole 111 on the frame simulator 110 to determine the theoretical three-dimensional coordinates of the simulated positioning hole 122. During the test, the bracket test piece is first assembled onto the frame simulator 110, and then the leaf spring simulator 133 is fixed to the bracket test piece using U-bolts 133c. The adjusting member 142 in the adjusting structure 140 is adjusted to a preset position using the connecting member 143, and then the front upper reaction rod simulator 131a and the rear upper reaction rod simulator 131c are installed onto the corresponding adjusting member 142. The front lower reaction rod simulator 131b and the rear lower reaction rod simulator 131d are installed onto the bracket test piece, and then the axle simulator 120 is connected to the front lower reaction rod simulator 131b and the rear lower reaction rod simulator 131d. By determining the actual three-dimensional coordinates of the simulated positioning hole 122 and comparing them with the theoretical three-dimensional coordinates, the assembly accuracy can be determined.

[0099] Combination Figures 1 to 7 As shown, exemplarily, and in conjunction with some of the foregoing embodiments, the influence of the cumulative effect of manufacturing deviations of each part on assembly deviations will be explained as an example. A coordinate system is established using the reference hole 111 on the chassis simulation part 110, and the theoretical three-dimensional coordinates of the simulated positioning hole 122 are determined using the fixture 100. During the test, the bracket test part is first assembled onto the chassis simulation part 110, and then the leaf spring test part is fixed to the bracket test part using U-bolts 133c. The adjusting part 142 in the adjusting structure 140 is adjusted to a preset position using the connecting part 143, and then the front upper reaction rod test part and the rear upper reaction rod test part are installed onto the corresponding adjusting part 142, respectively. The front lower reaction rod test part and the rear lower reaction rod test part are installed onto the bracket test part, and then the axle test part is connected to the front lower reaction rod test part and the rear lower reaction rod test part. The actual three-dimensional coordinates of the positioning hole to be measured are determined and compared with the theoretical three-dimensional coordinates to determine the assembly accuracy.

[0100] The inspection fixture 100 and assembly accuracy testing method provided in this application can reduce the use of environmental components during the dimensional development process, thereby lowering costs. Furthermore, it is applicable to different vehicle models, further reducing costs. Understandably, after determining the actual and theoretical three-dimensional coordinates, not only can the functional dimensions of the final assembly be determined, but also parameters such as the perpendicularity of the axle and wheelbase can be determined. In addition, the inspection fixture 100 provided in this application can also analyze and improve the dimensional chain accuracy of the balance suspension from a dimensional engineering perspective. It can analyze the manufacturing deviations of individual parts and compare the cumulative effect of these deviations on the entire balance suspension during assembly, determining the contribution of each part's manufacturing deviation to the final assembly accuracy. This provides guidance for optimizing part tolerances, improving the assembly accuracy of the balance suspension, and ultimately enhancing the overall vehicle's driving performance and mitigating functional problems such as vehicle drift.

[0101] It should be noted that the technical solutions described above can be implemented as independent embodiments or combined with each other as combined embodiments in actual implementation. The technical solutions described above are exemplary solutions, and the specific combination for implementation can be selected according to actual needs; this application does not impose specific limitations. Furthermore, the description of the embodiments of this application is based solely on the idea of ​​convenient explanation, and different embodiments are described in a corresponding order, such as according to the preset order required in the actual implementation process, rather than limiting the execution order between different embodiments. Accordingly, in actual implementation, if multiple embodiments provided by this application need to be implemented, it is not necessary to follow the execution order provided when describing the embodiments in this invention; instead, the execution order between different embodiments can be arranged according to needs.

[0102] It should be understood that, although Figure 6 and Figure 7 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 6 and Figure 7 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A gauge comprising: The testing tool comprises a frame simulation piece, an axle simulation piece and a balance suspension simulation piece, the balance suspension simulation piece is installed between the frame simulation piece and the axle simulation piece; The balance suspension simulation piece can be replaced by a balance suspension to-be-tested piece, and the axle simulation piece can be replaced by an axle to-be-tested piece; The testing tool further comprises an adjusting structure arranged on the frame simulation piece, the balance suspension simulation piece is connected to the frame simulation piece by means of the adjusting structure, the adjusting structure comprises a base, an adjusting piece and a connecting piece, the base is arranged on the frame simulation piece, the adjusting piece is used to be connected to the balance suspension simulation piece or the balance suspension to-be-tested piece, the base is provided with a receiving groove in a first direction, the adjusting piece is movably arranged in the receiving groove, the base is further provided with an opening in a second direction, the opening is communicated with the receiving groove to expose the adjusting piece, and the connecting piece is threadedly connected between the base and the adjusting piece; The adjusting structure is configured to adjust the relative position between the balance suspension simulation piece or the balance suspension to-be-tested piece and the frame simulation piece, so that the balance suspension simulation piece or the balance suspension to-be-tested piece is installed at a preset position, the adjusting piece is configured to move relative to the base in the first direction, so that the balance suspension simulation piece or the balance suspension to-be-tested piece is installed at the preset position, the second direction is perpendicular to the first direction, the frame simulation piece is provided with a plurality of reference holes in the circumferential direction, all the reference holes are coplanar to form a reference plane perpendicular to the first direction, the reference plane and the first direction jointly establish a reference coordinate system, and each flange simulation piece is provided with an analog positioning hole.

2. The gauge of claim 1, wherein, The balance suspension simulation piece comprises a reaction rod simulation piece, the reaction rod simulation piece is connected between the adjusting structure and the axle simulation piece or the axle to-be-tested piece, or The balance suspension to-be-tested piece comprises a reaction rod to-be-tested piece, the reaction rod to-be-tested piece is connected between the adjusting structure and the axle simulation piece or the axle to-be-tested piece.

3. A method of detecting assembly accuracy, for a gauge as claimed in any one of claims 1 to 2, characterized in that, The method comprises: Assembling a balance suspension simulation piece into a testing tool at a preset position on a frame simulation piece by means of an adjusting structure; Assembling an axle simulation piece on the balance suspension simulation piece; Replacing the balance suspension simulation piece with a balance suspension to-be-tested piece and / or replacing the axle simulation piece with an axle to-be-tested piece; Determining assembly accuracy based on the testing tool.

4. The method of claim 3, wherein The step of assembling the balance suspension simulation piece into the testing tool at the preset position on the frame simulation piece by means of the adjusting structure specifically comprises: Assembling a bracket simulation piece and a leaf spring simulation piece in the balance suspension simulation piece onto the frame simulation piece; Assembling a reaction rod simulation piece in the balance suspension simulation piece onto the adjusting structure by means of the adjusting structure to assemble to the preset position.

5. The method of claim 4, wherein The step of replacing the balance suspension simulation piece with a balance suspension to-be-tested piece specifically comprises: Replacing the bracket simulation piece with a bracket to-be-tested piece; and / or Replacing the leaf spring simulation piece with a leaf spring to-be-tested piece; and / or The reaction rod simulation part is replaced by a reaction rod to-be-tested part.

6. The method of claim 3-5, wherein Before the assembly precision is determined based on the gauge, the method further comprises: A reference coordinate system is established based on the vehicle frame simulation part. The vehicle frame simulation part is provided with a plurality of reference holes in the circumferential direction; all the reference holes are coplanar to form a reference plane perpendicular to the first direction, and the reference plane and the first direction jointly establish the reference coordinate system.

7. The method of claim 6, wherein Before the balanced suspension simulation part is replaced by a balanced suspension to-be-tested part and / or the axle simulation part is replaced by an axle to-be-tested part, the method further comprises: Theoretical three-dimensional coordinates of simulation positioning holes on the axle simulation part are acquired; the axle simulation part is provided with a plurality of flange simulation parts, and each flange simulation part is provided with one simulation positioning hole; The determination of the assembly precision based on the gauge specifically comprises: Without replacing the axle simulation part by an axle to-be-tested part, actual three-dimensional coordinates of the simulation positioning holes on the axle simulation part are determined based on the reference coordinate system; or, with the axle simulation part replaced by the axle to-be-tested part, actual three-dimensional coordinates of to-be-tested positioning holes on the axle to-be-tested part are determined based on the reference coordinate system; the axle to-be-tested part is provided with a plurality of flange to-be-tested parts, and each flange to-be-tested part is provided with one to-be-tested positioning hole; The assembly precision is determined based on the actual three-dimensional coordinates and the theoretical three-dimensional coordinates.

Images