Measurement auxiliary device for chassis rear subframe

Abstract

The utility model relates to the technical field of chassis detection auxiliary tools, in particular to a measurement auxiliary device for a chassis rear auxiliary frame. The device comprises a supporting base, a measuring platform arranged on the supporting base, and an A1 measuring bracket mechanism, an A2 measuring bracket mechanism, an A3 measuring bracket mechanism and a D measuring bracket mechanism which are distributed at each corner position of the measuring platform and are used for fixing four corners of a to-be-measured rear subframe in a one-to-one correspondence manner; the A1 measuring support mechanism, the A2 measuring support mechanism, the A3 measuring support mechanism and the D measuring support mechanism respectively comprise a clamping assembly used for clamping a rear auxiliary frame to be measured. The method and the device have the effect of improving the problems that manual measurement affects precision and is low in efficiency.

Description

Technical Field

[0001] This application relates to the technical field of chassis inspection auxiliary tooling, and in particular to a measurement auxiliary device for the rear subframe of a chassis. Background Technology

[0002] The rear subframe is an independent frame structure located beneath the rear chassis of a vehicle. It is connected to the main body frame via bolts and other fasteners, situated between the rear suspension system and the body. The rear subframe typically consists of two longitudinal beams and two transverse beams. Tubular reinforcements are installed at key connection points at the four material transfer locations to further enhance the local strength and torsional resistance of the rear subframe. The rear subframe, especially the connection areas, undergoes rigorous testing for multiple dimensional indicators, including overall dimensions, mounting hole position accuracy, flatness, and perpendicularity, to ensure product quality control.

[0003] In related technologies, the dimensional inspection of the rear subframe crossbeams and longitudinal beams is typically carried out by inspectors using traditional measuring tools such as calipers, micrometers, and tape measures to directly measure the length, width, height, and dimensions of key parts of the rear subframe. For complex-shaped parts at the location of reinforcement components, special measuring tools or measuring aids such as radius gauges and angle gauges are required.

[0004] Regarding the aforementioned technologies, the measuring techniques, force applied, and reading habits of the inspectors during the measurement process can all affect the measurement results. For example, when using calipers, different people measuring the same dimension may have different results due to uneven force. Furthermore, the rear subframe structure is complex, with many irregular shapes and curved surfaces. When using measuring tools, frequent adjustments to the tool's position and angle are required, making the operation cumbersome and often time-consuming to measure a complete rear subframe. For situations requiring the measurement of multiple points or parts, such as flatness and perpendicularity, multiple measurements and records must be taken at different locations before data processing and analysis, resulting in low overall measurement efficiency. Utility Model Content

[0005] To address the issues of low accuracy and efficiency associated with manual measurement, this application provides a measurement auxiliary device for the rear subframe of a chassis.

[0006] The measurement auxiliary device for the rear subframe of a chassis provided in this application adopts the following technical solution:

[0007] A measurement auxiliary device for a rear subframe of a chassis includes a support base, a measurement platform disposed on the support base, and A1 measurement bracket mechanism, A2 measurement bracket mechanism, A3 measurement bracket mechanism and D measurement bracket mechanism distributed at each corner position of the measurement platform for correspondingly fixing the four corners of the rear subframe to be measured.

[0008] The A1 measuring bracket mechanism, the A2 measuring bracket mechanism, the A3 measuring bracket mechanism, and the D measuring bracket mechanism all include a clamping assembly for clamping the rear subframe to be measured.

[0009] By adopting the above technical solution, each measurement auxiliary device includes a support base, a measurement platform, and measurement bracket mechanisms A1, A2, A3, and D distributed at the corner positions of the measurement platform. Each measurement bracket mechanism is equipped with a clamping component for fixing the subframe to be measured. The four tubular parts to be measured are defined as reference targets A1, A2, A3, and D, respectively, forming the AD main reference. Reference point B and reference point C are marked on the longer crossbeam, forming references B and C.

[0010] The A1, A2, A3, and D measuring bracket mechanisms are respectively positioned to correspond one-to-one with the A1, A2, A3, and D reference targets at the four corners of the rear subframe to be measured. This establishes a stable and unified measurement reference, avoiding inconsistencies caused by measurement techniques and force during manual measurement, thus reducing measurement errors. The reference positioning and clamping mechanisms on the measurement auxiliary device allow the rear subframe to be quickly and accurately installed in the measurement position, eliminating the need for frequent adjustments to the position and angle of measuring tools to adapt to complex shapes, as is common in traditional measurements, saving preparation time. Under suitable testing conditions, the rear subframe is installed and clamped. An initial coordinate system is established using the reference plane composed of A1 / A2 / A3 and the axis composed of B / C references to measure the profile of reference D. If the requirements are met, clamping force is applied to references A1 / A2 / A3 / D, and a coordinate system is established using the main reference plane composed of AD and the axis composed of B / C references to measure other geometric tolerances. This eliminates the need for repeated installations, improving overall measurement efficiency.

[0011] Furthermore, the A1 measuring support mechanism also includes an A1 fixed base, an A1 reference platform, a theoretical position fixing pin, and a reference C positioning pin. The A1 fixed base is fixedly connected to the measuring platform, the A1 reference platform is fixedly connected to the upper side of the A1 fixed base, and the clamping assembly is installed on the A1 fixed base and located adjacent to the A1 reference platform.

[0012] The A1 fixed base is provided with a theoretical pin seat on the side of the A1 reference platform away from the clamping assembly, through which the theoretical position fixing pin is vertically inserted. The theoretical pin seat is provided with a C pin adjusting seat for the reference C positioning pin to pass through and move. The theoretical pin seat is provided with limiting baffles on both sides for cooperating with the C pin adjusting seat.

[0013] By adopting the above technical solution, in the A1 measuring bracket mechanism, the theoretical position fixing pin provides an accurate theoretical position reference for related components, while the reference C positioning pin further assists in positioning. The two work together to make the positioning of the rear subframe at position A1 more accurate, reducing measurement errors caused by inaccurate positioning. The limiting plates on both sides of the theoretical pin seat cooperate with the C-pin adjusting seat to restrict the movement of the reference C positioning pin within a certain range, preventing excessive offset or detachment, ensuring the stability and reliability of its positioning function, and helping to maintain the positioning accuracy of the entire A1 measuring bracket mechanism. The C-pin adjusting seat allows the reference C positioning pin to pass through and move, enabling the mechanism to adapt to rear subframes of different specifications or with certain manufacturing tolerances. By appropriately adjusting the position of the reference C positioning pin, more accurate positioning can be achieved, improving the compatibility of the entire measuring auxiliary device with different products.

[0014] Furthermore, the A2 measuring support mechanism also includes an A2 fixed base, an A2 reference platform, and a reference B positioning pin. The A2 fixed base is fixedly connected to the measuring platform, the A2 reference platform is fixedly connected to the upper side of the A2 fixed base, and the clamping assembly is installed on the A2 fixed base and located adjacent to the A2 reference platform.

[0015] The A2 fixing base has a B pin fixing seat on the side of the A2 reference platform away from the clamping assembly, for the reference B positioning pin to be vertically set.

[0016] By adopting the above technical solution, the A2 reference platform provides a stable reference for the measurement of the rear subframe. The B pin fixing seat and the reference B positioning pin, which are fixed on the A2 fixed base, can accurately limit the spatial posture of the rear subframe in the corresponding position, ensuring that the rear subframe is highly consistent in each installation and positioning. This provides a unified starting reference for subsequent measurement data, greatly improving the accuracy and repeatability of the measurement results and effectively reducing measurement errors caused by positioning deviations.

[0017] Furthermore, the A3 measuring support mechanism also includes an A3 fixed base and an A3 reference platform. The A3 fixed base is fixedly connected to the measuring platform, and the A3 reference platform is fixedly connected to the upper side of the A3 fixed base. The clamping assembly is installed on the A3 fixed base and located adjacent to the A3 reference platform.

[0018] By adopting the above technical solution, the A3 fixed base is fixedly connected to the measurement platform, and the A3 reference platform is fixedly connected to the upper side of the A3 fixed base, providing a positioning reference surface for the rear subframe. The rear subframe is fixed to the A3 reference platform by the clamping assembly, which precisely constrains the position of the rear subframe in this area, avoiding measurement deviations caused by fluctuations in the placement position, greatly improving the accuracy of the measurement starting position, and ensuring high precision in the measurement process.

[0019] Furthermore, the D measurement support mechanism also includes a D fixed base and a D reference platform. The D fixed base is fixedly connected to the measurement platform, and the D fixed base has a lifting and adjusting mounting seat for mounting the D reference platform on the side wall away from the clamping assembly.

[0020] By adopting the above technical solution, the D fixed base is equipped with a lifting and adjusting mounting seat for installing the D reference platform, allowing the height of the D reference platform to be flexibly adjusted according to actual measurement needs. When dealing with rear subframes of different specifications and dimensions, the height of the D reference platform can be adjusted to ensure a better and more precise fit with the rear subframe at position D, ensuring accurate positioning and creating favorable conditions for subsequent precise measurements. This helps reduce measurement errors caused by mismatched reference platform heights. Through lifting and adjusting, the D reference platform can coordinate with other relevant reference components of the measurement support mechanism to construct a precise and reasonable overall measurement reference system. When measuring flatness, perpendicularity, and other geometric tolerances, the adjusted appropriate height ensures the matching degree between various references, improving the consistency of the references throughout the measurement process and enhancing the reliability of the measurement results.

[0021] Furthermore, the clamping assembly includes a clamping head for pressing against the upper side of the part to be tested and an operating wrench for driving the clamping head.

[0022] By adopting the above technical solution, the wrench is used to drive the clamping head, which makes it easier for the measuring personnel to fix the subframe. By applying a certain force to the wrench, the action of the clamping head can be controlled to clamp the part to be measured, and the fixing of the subframe can be completed quickly, thereby improving the overall measurement efficiency.

[0023] Furthermore, the support base is provided with multiple roller assemblies on both sides for adjusting the position of the measuring platform. The roller assembly includes a roller seat fixedly connected to the measuring platform, a wheel body rotatably connected to the roller seat, and a pull handle rotatably connected to the roller seat.

[0024] By adopting the above technical solution, the roller assembly utilizes the rotational characteristics of the wheels to facilitate the adjustment of the measurement platform's position. Before actual measurement work, the roller assembly can be used to fine-tune the position of the measurement platform, ensuring that the entire measurement auxiliary device is precisely positioned at the appropriate starting point, which helps to further improve the accuracy of subsequent measurements. Each roller assembly is equipped with a rotatably connected pull handle. The measuring operator only needs to grasp the pull handle and apply a small force to move the measurement platform through the rotation of the wheels, making operation easy and effortless. Compared to the more laborious method of directly pushing or lifting the measurement platform, the combination of the pull handle and the rollers reduces physical exertion during operation and improves work efficiency.

[0025] Furthermore, the measuring platform is provided with a limiting block on one side for limiting the roller assembly, and an anti-detachment pin for fixing the measuring platform on the side away from the limiting block. The measuring platform is fixedly connected to a mounting base for installing the anti-detachment pin on its upper side. The mounting base has a through hole for the anti-detachment pin to pass through, and the measuring platform has a fixing hole at a corresponding position of the through hole for the anti-detachment pin to pass through. The end of the anti-detachment pin passes through the mounting base and the measuring platform and abuts against the upper side of the support base.

[0026] By adopting the above technical solution, the limiting block can limit the movement of the roller assembly, restricting the range of movement of the measuring platform in a specific direction. In conjunction with the anti-detachment pin, it ensures both stable fixation of the measuring platform on the support base and precise positional limitation. The end of the anti-detachment pin passes through the mounting base and the measuring platform and abuts against the upper side of the support base, firmly securing the measuring platform to the support base. This prevents the measuring platform from accidentally detaching from the support base during measurement due to equipment vibration, accidental collisions, or other disturbances, ensuring the safety of operators and surrounding equipment.

[0027] Furthermore, the support base is equipped with multiple casters and a telescopic fixing seat that cooperates with each caster on its bottom side.

[0028] By adopting the above technical solution, the casters enable the support base to move in different directions, thereby allowing for position transfer in a relatively open measurement area or fine-tuning in a narrow space. This improves the mobility of the entire measurement auxiliary device, making it easy to move it quickly to a suitable measurement location and reducing the labor intensity and time cost of manual handling.

[0029] Furthermore, the measuring platform is provided with a weight-reducing channel, and multiple reinforcing ribs are integrally connected to the bottom side of the measuring platform.

[0030] By adopting the above technical solutions, the weight-reducing through-slots in the measurement platform can eliminate unnecessary material weight and reduce the overall weight of the measurement auxiliary device. The reinforcing ribs effectively distribute the forces exerted on the measurement platform during the load-bearing process of the rear subframe and measurement operations, preventing deformation or damage due to excessive localized stress and ensuring the structural integrity and stability of the measurement platform during use.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By establishing stable and unified measurement benchmarks through the A1, A2, A3, and D measurement support mechanisms corresponding to the respective benchmark targets, inconsistencies in benchmarks caused by factors such as technique and force during manual measurement are avoided, thus reducing measurement errors. Each support mechanism, including the A1 measurement support mechanism, can adapt to different specifications or rear subframes with certain manufacturing tolerances through its adjustable settings (such as the C-pin adjustment seat), improving the compatibility of the entire measurement auxiliary device with various products and expanding its application range. The positioning pins and other components in each measurement support mechanism work together to precisely define the position of the rear subframe, ensuring the accuracy of positioning during each installation, providing a reliable starting benchmark for measurement, and improving the accuracy of measurement results.

[0033] 2. The reference positioning and clamping mechanism of the measurement auxiliary device allows the rear subframe to be quickly and accurately installed in the measurement position without frequent adjustments to the measuring tools to adapt to complex shapes, saving measurement preparation time. Furthermore, once the rear subframe is installed and clamped, different measurements can be performed sequentially according to conditions, eliminating the need for repeated installations. The wrench-driven clamping head facilitates quick fixation of the rear subframe, reducing fixing time, improving operational convenience, and thus enhancing overall measurement efficiency.

[0034] 3. The roller assembly, combined with the pull handle, allows for easy and effortless adjustment of the measuring platform position, ensuring it is precisely positioned at the appropriate starting point for measurement. This reduces the physical exertion required for operation. The limit stop and anti-drop pin work together to ensure platform stability, creating conditions for safe measurement and enhancing safety during use. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of a measurement auxiliary device for a chassis rear subframe according to an embodiment of this application.

[0036] Figure 2 This is a schematic diagram of the overall structure of the measurement platform, A1 measurement support mechanism, A2 measurement support mechanism, A3 measurement support mechanism and D measurement support mechanism in the embodiments of this application.

[0037] Figure 3 This is an exploded view of the roller assembly in an embodiment of this application.

[0038] Figure 4 yes Figure 1 Enlarged schematic diagram of the limiting block in section A.

[0039] Figure 5 yes Figure 2 Enlarged schematic diagram of the anti-detachment pin and mounting base in section B.

[0040] Figure 6 This is an exploded view of the structure of the A1 measuring support mechanism in the embodiments of this application.

[0041] Figure 7This is an exploded view of the structure of the D measuring support mechanism in the embodiments of this application.

[0042] Explanation of reference numerals in the attached drawings: 1. Support base; 11. Casters; 12. Lifting / Retracting fixed base; 13. Sliding rail; 14. Limiting baffle; 2. Measuring platform; 21. Weight-reducing through groove; 22. Reinforcing rib; 23. Roller assembly; 231. Roller seat; 2311. Arc groove; 2312. Insertion hole; 232. Wheel body; 2321. Rotating shaft; 233. Pull handle; 2331. U-shaped pull rod; 2332. Connecting block; 2333. Through hole; 2334. Control pin; 24. Anti-fall pin; 25. Mounting base; 3. A1 Measuring bracket mechanism; 31. A1 fixed base; 32. A1 reference platform; 33. Theoretical position fixing pin; 331. Theoretical pin seat; 332. Limiting baffle; 3 4. Reference C positioning pin; 341. C pin adjustment seat; 4. A2 measuring bracket mechanism; 41. A2 fixed base; 42. A2 reference platform; 43. Reference B positioning pin; 431. B pin fixed seat; 5. D measuring bracket mechanism; 51. D fixed base; 52. D reference platform; 53. Lifting adjustment mounting seat; 531. Mounting plate; 532. Lifting seat; 5321. Sliding through groove; 5322. Locking hole; 533. Connecting rod; 5331. High position hole; 5332. Low position hole; 534. Lifting handle; 535. Locking pin; 6. A3 measuring bracket mechanism; 61. A3 fixed base; 62. A3 reference platform; 7. Clamping assembly; 71. Clamping head; 72. Operating wrench. Detailed Implementation

[0043] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-7 The present application will be further described in detail with reference to the embodiments.

[0044] This application discloses a measurement auxiliary device for the rear subframe of a chassis. The positions of four tubular reinforcement members to be measured are defined as reference targets A1, A2, A3, and D, respectively, forming the AD main reference. Reference points B and C are marked on a longer crossbeam, forming references B and C.

[0045] Reference Figure 1 The measurement auxiliary device for the rear subframe of the chassis includes a support base 1, a measurement platform 2, and measurement bracket mechanisms A1, A2, A3, and D. The support base 1 is supported on the ground and used to install other components. The measurement platform 2 is installed on the upper side of the support base 1. The measurement bracket mechanisms are distributed at the corner positions of the measurement platform 2 to fix the four corners of the rear subframe one by one.

[0046] The support base 1 is equipped with casters 11 at the four corners on its bottom side, allowing the operator to move the entire device on the ground using the casters 11. A retractable mounting base 12 is fixedly connected to each caster 11 at an adjacent position on the support base 1. When the device is moved to the desired position, the bottom of the retractable mounting base 12 can be pressed against the ground to lock the device in place.

[0047] Reference Figure 1 and Figure 2 The measuring platform 2 is provided with a weight-reducing channel 21 for reducing its own weight, and multiple reinforcing ribs 22 are integrally connected to the bottom side of the measuring platform 2.

[0048] The top surface of the support base 1 is symmetrically arranged on both sides along the length direction and fixedly connected with sliding rails 13 for the measurement platform 2 to move. The measurement platform 2 is provided with multiple roller assemblies 23 on both sides along the width direction for adjusting the relative position of the measurement platform 2 and the support base 1.

[0049] Reference Figure 2 and Figure 3 The roller assembly 23 includes a roller seat 231, a wheel body 232, and a pull handle 233. The roller seat 231 is fixedly connected to the side wall of the measuring platform 2. The wheel body 232 has a rotating shaft 2321 rotatably connected to it at its axial position. The roller seat 231 has symmetrical arc-shaped grooves 2311 on both sides for the rotating shaft 2321 to pass through and slide. The pull handle 233 includes an integrally connected U-shaped pull rod 2331 and connecting blocks 2332 symmetrically arranged and integrally connected to the ends of the U-shaped pull rod 2331. The connecting blocks 2332 have through holes 2333 for the rotating shaft 2321 to pass through. The end of the rotating shaft 2321 away from the wheel body 232 passes through the arc-shaped groove 2311 and is inserted into the through hole 2333. The two connecting blocks 2332 have symmetrically arranged and fixedly connected control pins 2334 for cooperating with the roller seat 231 on their two adjacent sides. The roller seat 231 has an insertion hole 2312 at the position adjacent to the arc groove 2311 for the control pin 2334 to be inserted and rotated.

[0050] Combination Figure 1 When the operator pulls the lever, the control pin 2334 rotates within the insertion hole 2312, causing the rotating shaft 2321 to slide within the arc-shaped groove 2311. This causes the wheel 232 to move downwards within the roller seat 231. After the roller moves downwards, it abuts against the support base 1, facilitating the horizontal movement of the measuring platform 2 on the support base 1. (Refer to...) Figure 4 The support base 1 is fixedly connected to the side wall with a limiting baffle 14 for limiting the wheel 232, so as to prevent the wheel 232 from rolling excessively and falling off the support base 1.

[0051] Reference Figure 5The measuring platform 2 has an anti-detachment pin 24 on the side away from the limiting baffle 14 for fixing the position of the measuring platform 2. A mounting base 25 for mounting the anti-detachment pin 24 is fixedly connected to the upper side of the measuring platform 2. The mounting base 25 has a through hole for the anti-detachment pin 24 to pass through. The measuring platform 2 has a fixing hole at a corresponding position of the through hole for the anti-detachment pin 24 to pass through. The end of the anti-detachment pin 24 passes through the mounting base 25 and the measuring platform 2 and abuts against the upper side of the support base 1, thereby fixing the position of the measuring platform 2.

[0052] Reference Figure 2 and Figure 6 The measurement support mechanisms are arranged clockwise on the measurement platform 2 as follows: A1 measurement support mechanism 3, A2 measurement support mechanism 4, D measurement support mechanism 5, and A3 measurement support mechanism 6. Each measurement support mechanism includes a clamping assembly 7 for clamping the rear subframe to be measured. The clamping assembly 7 includes a clamping head 71 for pressing against the upper side of the part to be measured and an operating wrench 72 for driving the clamping head 71.

[0053] The A1 measuring support mechanism 3 also includes an A1 fixed base 31, an A1 reference platform 32, a theoretical position fixing pin 33, and a reference C positioning pin 34. The A1 fixed base 31 is fixedly connected to the measuring platform 2, and the A1 reference platform 32 is fixedly connected to the upper side of the A1 fixed base 31. The clamping assembly 7 is installed on the A1 fixed base 31 and located adjacent to the A1 reference platform 32. The A1 fixed base 31 has a theoretical pin seat 331 on the side of the A1 reference platform 32 away from the clamping assembly 7, through which the theoretical position fixing pin 33 is vertically inserted. The theoretical pin seat 331 has a C-pin adjusting seat 341 through which the reference C positioning pin 34 is inserted and moved. The theoretical pin seat 331 has limiting baffles 332 on both sides for cooperating with the C-pin adjusting seat 341.

[0054] The A2 measuring support mechanism 4 also includes an A2 fixed base 41, an A2 reference platform 42, and a reference B positioning pin 43. The A2 fixed base 41 is fixedly connected to the measuring platform 2, the A2 reference platform 42 is fixedly connected to the upper side of the A2 fixed base 41, and the clamping assembly 7 is installed on the A2 fixed base 41 and located adjacent to the A2 reference platform 42. The A2 fixed base 41 has a B-pin fixing seat 431 on the side of the A2 reference platform 42 away from the clamping assembly 7 for the reference B positioning pin 43 to be vertically positioned.

[0055] The A3 measuring support mechanism 6 also includes an A3 fixed base 61 and an A3 reference platform 62. The A3 fixed base 61 is fixedly connected to the measuring platform 2, and the A3 reference platform 62 is fixedly connected to the upper side of the A3 fixed base 61. The clamping assembly 7 is installed on the A3 fixed base 61 and located adjacent to the A3 reference platform 62.

[0056] Combination Figure 7 The D measuring support mechanism 5 also includes a D fixed base 51 and a D reference platform 52. The D fixed base 51 is fixedly connected to the measuring platform 2. The D fixed base 51 has a lifting and adjusting mounting seat 53 on the side wall away from the clamping assembly 7 for mounting the D reference platform 52 and for adjusting the position of the D reference platform 52.

[0057] The lifting and adjusting mounting base 53 includes a mounting plate 531 fixedly connected to the side wall of the D fixed base 51 and used for mounting other components, a lifting seat 532 fixedly connected to the mounting plate 531, a connecting rod 533 passing through and sliding on the lifting seat 532, a lifting handle 534 fixedly connected to the bottom end of the connecting rod 533, and a locking pin 535 for locking the position of the connecting rod 533. The D fixed base 51 is fixedly connected to the upper end of the connecting rod 533. The lifting seat 532 has a sliding through groove 5321 for the connecting rod 533 to rise and fall. The lifting seat 532 has 6 locking holes 5322 on its side wall for the locking pin 535 to pass through. The connecting rod 533 has high holes 5331 and low holes 5332 spaced apart for the locking pin 535 to pass through.

[0058] The implementation principle of a measurement auxiliary device for a chassis rear subframe according to an embodiment of this application is as follows: Measurement bracket mechanisms 6, A1, A2, D, and A3, are distributed clockwise at the corner positions of the measurement platform 2. Each measurement bracket mechanism is equipped with a clamping assembly 7 for fixing the rear subframe. The four locations of the tubular reinforcement to be measured are defined as reference targets A1, A2, A3, and D, forming the AD main reference. Reference points B and C are marked on the longer crossbeam to form references B and C, thereby establishing a clear reference system for subsequent measurements.

[0059] The A1 fixed base 31 is fixed on the measuring platform 2, with the A1 reference platform 32 on the upper side and the clamping assembly 7 located adjacent to it. The theoretical position fixing pin 33 provides an accurate theoretical position reference through the theoretical pin seat 331. The reference C positioning pin 34 is movable with the help of the C pin adjusting seat 341 and cooperates with the limiting stop 332 to achieve precise positioning. The A2 fixed base 41 is fixed on the measuring platform 2, with the A2 reference platform 42 on the upper side and the clamping assembly 7 arranged adjacent to it. The reference B control pin 2334 positioning pin is vertically set through the B pin fixing seat 431 on the A2 fixed base 41, providing precise spatial attitude limitation for the rear subframe in the corresponding position and ensuring the consistency of positioning during each installation.

[0060] The A3 fixed base 61 is fixedly connected to the measuring platform 2, the A3 reference platform 62 is on the upper side, and the clamping assembly 7 is used to fix the rear subframe, provide a positioning reference surface for the rear subframe, constrain its position in this area, and improve the accuracy of the measurement starting position.

[0061] The D-fixed base 51 is fixed on the measuring platform 2, and the lifting and adjusting mounting seat 53 on its side wall can adjust the position of the D reference platform 52. Through the cooperation of components such as the lifting seat 532, connecting rod 533, lifting handle 534 and locking pin 535, the D reference platform 52 can be raised, lowered and locked to adapt to the measurement needs of the rear subframe in different situations.

[0062] During inspection, the parts are first placed in the B / C datum, and a clamping force of ≥1kN is applied to clamp A1, A2, and A3. An initial coordinate system is established using the datum plane formed by A1 / A2 / A3 and the axis formed by the B / C datum. The profile of the D datum is measured, and the result is determined to meet the requirements. If the profile of the D datum meets the requirements, a clamping force of ≥1kN is applied to the A1, A2, A3, and D datums. The main datum formed by AD is used as a plane, and the coordinate system is established using the axis formed by the B / C datum. Other geometric tolerances in the drawings are measured. Through this process and coordinate system establishment method, a comprehensive and accurate measurement of the rear subframe of the chassis is achieved.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A measuring auxiliary device for a rear subframe of a chassis, characterized in that: It includes a support base (1), a measurement platform (2) located on the support base (1), and A1 measurement bracket mechanism (3), A2 measurement bracket mechanism (4), A3 measurement bracket mechanism (6) and D measurement bracket mechanism (5) distributed at each corner position of the measurement platform (2) for correspondingly fixing the four corners of the rear subframe to be measured. The A1 measuring bracket mechanism (3), the A2 measuring bracket mechanism (4), the A3 measuring bracket mechanism (6) and the D measuring bracket mechanism (5) all include a clamping assembly (7) for clamping the rear subframe to be measured.

2. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The A1 measuring support mechanism (3) further includes an A1 fixed base (31), an A1 reference platform (32), a theoretical position fixing pin (33), and a reference C positioning pin (34). The A1 fixed base (31) is fixedly connected to the measuring platform (2), and the A1 reference platform (32) is fixedly connected to the upper side of the A1 fixed base (31). The clamping assembly (7) is installed on the A1 fixed base (31) and located at an adjacent position to the A1 reference platform (32). The A1 fixed base (31) is provided with a theoretical pin seat (331) on the side of the A1 reference platform (32) away from the clamping assembly (7) for the theoretical position fixing pin (33) to pass through vertically. The theoretical pin seat (331) is provided with a C pin adjusting seat (341) for the reference C positioning pin (34) to pass through and move. The theoretical pin seat (331) is provided with limiting baffles (332) on both sides for cooperating with the C pin adjusting seat (341).

3. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The A2 measuring support mechanism (4) further includes an A2 fixed base (41), an A2 reference platform (42), and a reference B positioning pin (43). The A2 fixed base (41) is fixedly connected to the measuring platform (2), and the A2 reference platform (42) is fixedly connected to the upper side of the A2 fixed base (41). The clamping assembly (7) is installed on the A2 fixed base (41) and located at an adjacent position to the A2 reference platform (42). The A2 fixed base (41) is provided with a B pin fixing seat (431) on the side of the A2 reference platform (42) away from the clamping assembly (7) for the reference B positioning pin (43) to be vertically set.

4. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The A3 measuring support mechanism (6) further includes an A3 fixed base (61) and an A3 reference platform (62). The A3 fixed base (61) is fixedly connected to the measuring platform (2), and the A3 reference platform (62) is fixedly connected to the upper side of the A3 fixed base (61). The clamping assembly (7) is installed on the A3 fixed base (61) and located adjacent to the A3 reference platform (62).

5. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The D measuring support mechanism (5) further includes a D fixed base (51) and a D reference platform (52). The D fixed base (51) is fixedly connected to the measuring platform (2). The D fixed base (51) has a lifting and adjusting mounting seat (53) for mounting the D reference platform (52) on the side wall away from the clamping assembly (7).

6. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The clamping assembly (7) includes a clamping head (71) for pressing against the upper side of the part to be tested and an operating wrench (72) for driving the clamping head (71).

7. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The support base (1) has multiple roller assemblies (23) on both sides for adjusting the position of the measuring platform (2). The roller assembly (23) includes a roller seat (231) fixedly connected to the measuring platform (2), a wheel body (232) rotatably connected to the roller seat (231), and a pull handle (233) rotatably connected to the roller seat (231).

8. The measuring auxiliary device for a rear subframe of a chassis according to claim 7, characterized in that: The measuring platform (2) has a limiting block on one side for limiting the roller assembly (23). The measuring platform (2) has an anti-detachment pin (24) on the side away from the limiting block for fixing the measuring platform (2). The measuring platform (2) has a mounting base (25) fixedly connected to the upper side for mounting the anti-detachment pin (24). The mounting base (25) has a through hole for the anti-detachment pin (24) to pass through. The measuring platform (2) has a fixing hole at the corresponding position of the through hole for the anti-detachment pin (24) to pass through. The end of the anti-detachment pin (24) passes through the mounting base (25) and the measuring platform (2) and abuts against the upper side of the support base (1).

9. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The support base (1) is equipped with a plurality of casters (11) on its bottom side and a telescopic fixing seat (12) that cooperates with each of the casters (11).

10. The measuring auxiliary device for a rear subframe of a chassis according to claim 1, characterized in that: The measuring platform (2) has a weight-reducing through groove (21), and the measuring platform (2) has multiple reinforcing ribs (22) integrally connected to its bottom side.

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