Automobile front wheel toe value measuring tool

Abstract

The utility model provides a kind of automobile front wheel toe value measuring tool, belong to the measuring device technical field for measuring the distance or gap between spaced apart object or spaced apart hole. Measuring tool includes main measuring scale and vice measuring scale, main measuring scale is equipped with main scale, vice measuring scale is equipped with vernier scale for cooperating with main scale measurement, the end of main measuring scale and vice measuring scale is equipped with measuring needle for respectively with the same measuring point positioning cooperation on left front wheel tire and right front wheel tire, main measuring scale and vice measuring scale sliding fit assembly are used for adjusting the total length of two measuring scales, and are used for reading the reading A of the same measuring point on left front wheel tire and right front wheel tire when tire rear portion and the reading B when tire front portion by main scale and vernier scale, the difference of A and B is front wheel toe value. The utility model introduces the principle of division measurement, measures front wheel toe value by main scale and vernier scale, and greatly improves the measurement accuracy.

Description

Technical Field

[0001] This utility model relates to a tool for measuring the toe-in value of automobile front wheels, and belongs to the technical field of measuring devices for measuring the distance or gap between spaced-out objects or spaced-out holes. Background Technology

[0002] Front wheel toe-in is one of the most important parameters in vehicle four-wheel alignment. Its main function is to eliminate the outward tendency of the wheels during rolling caused by front wheel camber, ensuring pure rolling between the wheels and the ground, achieving good vehicle handling and stability, and preventing abnormal tire wear. Each car manufacturer has specific requirements for the front wheel toe-in value, and the toe-in value needs to be checked and adjusted after a certain mileage / time of vehicle use. Using four-wheel alignment equipment is simple, easy to operate, and provides relatively accurate data. However, considering the current state of the automotive repair industry, most areas lack the facilities for four-wheel alignment, and manual measurement is more commonly used.

[0003] For example, Chinese utility model patent CN217786053U discloses a toe-in positioning ruler, including tube A and tube B. One end of tube A is inserted into tube B, and the other end is fixed with a measuring needle A. The end of tube B is fixed with a measuring needle B. The two tubes can extend and retract relative to each other to change the distance between measuring needles A and B. After adjustment, the positions of the two tubes can be fixed by tightening screws. In use, measuring needles A and B are used to draw lines / dots on the front side of the left and right front tires of the car, respectively, marking A and B. Then, the tires are rotated 180 degrees so that marks A and B are on the rear side of the tires. Using mark A as a reference, measuring needle A is aligned with mark A, and measuring needle B is used to draw a line / dot on the right tire, marking C. The horizontal distance between mark C and mark B is observed. If it is within the error range, the toe-in value is qualified; if it is outside the error range, repair is required. After repair, the test is repeated until it is qualified.

[0004] The aforementioned toe-in gauge determines the toe-in value by visually observing the horizontal distance between two marks. Although other embodiments suggest using a pen cap clamped at the end of fitting A, the pen cap lacks graduations, still relying on visual inspection. In reality, front wheel toe-in values ​​are generally required to be small (typically 0-2mm), and visual inspection easily leads to inaccurate results, affecting vehicle repair quality. Furthermore, even if a separate ruler is used to measure the horizontal distance between marks C and B, or a ruler is directly fixed to the end of the fitting, the measurement accuracy of a typical ruler is only 1mm. The measurement results are greatly influenced by subjective readings, resulting in significant measurement errors, which are still far from the accuracy of four-wheel alignment equipment. Utility Model Content

[0005] The purpose of this invention is to provide a tool for measuring the toe-in value of automobile front wheels, so as to solve the problem of large measurement errors in existing measuring tools.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A tool for measuring the toe-in value of automobile front wheels includes a main measuring scale and a secondary measuring scale. The main measuring scale has a main scale, and the secondary measuring scale has a vernier scale for measurement in conjunction with the main scale. The ends of the main and secondary measuring scales are equipped with measuring needles for positioning and engaging with the same measuring point on the left and right front tires, respectively. The main and secondary measuring scales are slidably fitted together to adjust the total length of the two measuring scales and to read the reading A when the same measuring point on the left and right front tires is at the rear of the tire and the reading B when it is at the front of the tire, through the main scale and the vernier scale. The difference between A and B is the toe-in value of the front wheels.

[0007] The beneficial effects of the above technical solution are as follows: This utility model is a pioneering invention. The provided tool for measuring the toe-in value of automobile front wheels includes a main measuring scale and a secondary measuring scale. The main measuring scale has a main graduation, and the secondary measuring scale has a vernier graduation. By introducing the principle of scale division measurement, the measurement accuracy can be improved. The ends of the main and secondary measuring scales are equipped with measuring needles for positioning and engaging with the same measuring point on the left and right front tires, respectively. The main and secondary measuring scales are slidably fitted together, allowing adjustment of the total length of the two measuring scales. In use, the measurement can be performed first at the rear of the tire, positioning the two measuring needles with a measuring point on the left and right front tires, respectively. Then, a reading A is obtained through the main and vernier graduations. Because the measurement is performed using the difference in scale division between the main and vernier graduations, the measurement accuracy is higher. Then, rotate the left and right front tires forward 180 degrees. By adjusting the total length of the two measuring scales, you can measure the same point on both front tires again at the front of the tires. Read a value B by combining the main scale and the vernier scale. The difference between A and B is the front wheel toe-in value. Alternatively, you can first measure at the front of the tires, then rotate the left and right front tires backward 180 degrees, and measure at the rear of the tires; the principle is the same.

[0008] Furthermore, the ends of the main measuring scale and the auxiliary measuring scale are respectively vertically mounted with adjustable measuring rods, the measuring rods at both ends are parallel to each other and the measuring needles are respectively mounted at their ends.

[0009] Furthermore, the ends of the main measuring scale and the auxiliary measuring scale are respectively provided with through holes for the measuring rod to pass through, and the ends of the main measuring scale and the auxiliary measuring scale are respectively threaded with tightening screws for extending into the through holes to tighten the measuring rod.

[0010] Furthermore, the measuring rod has graduations along its length.

[0011] Furthermore, the ends of the main measuring scale and the auxiliary measuring scale are respectively provided with reinforcing rods. One end of the reinforcing rod is fixed to the main measuring scale or the auxiliary measuring scale, and the other end is fixed to the corresponding measuring rod.

[0012] Furthermore, the main measuring scale, the corresponding reinforcing rod, and the measuring rod are arranged in a triangle, and the secondary measuring scale, the corresponding reinforcing rod, and the measuring rod are also arranged in a triangle.

[0013] Furthermore, one end of the reinforcing rod is fixed to the main measuring scale or the auxiliary measuring scale by a locking bolt, and the other end is provided with a through hole for the measuring rod to pass through, and this end is also threaded with a tightening bolt for extending into the through hole to tighten the measuring rod.

[0014] Furthermore, the measuring needle is detachably connected to the end of the measuring rod via a cap nut, so that after measurement at the front or rear of the tire is completed, the measuring needle remains on the tire and rotates 180 degrees with the tire.

[0015] Furthermore, the secondary measuring scale is cylindrical, with the main measuring scale inserted inside. The cylindrical wall of the secondary measuring scale has a window for exposing the main scale, and the vernier scale is set along the edge of the window.

[0016] Furthermore, the main scale starts from zero, and there is a gap between the zero scale and the end of the main measuring scale. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating the usage state of Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 2 This is a partial structural diagram of the left end of Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 3 This is a partial structural diagram of the left end of the front wheel toe-in measuring tool of this utility model (the measuring rod and reinforcing rod are not shown). Figure 4 This is a partial structural diagram of the right end of the front wheel toe-in measuring tool of this utility model (the measuring rod and reinforcing rod are not shown). Figure 5 This is a structural diagram of the main measuring ruler in Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 6 This is a structural diagram of the auxiliary measuring ruler in Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 7 This is a partial enlarged view of the main scale and vernier scale in Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 8This is a structural diagram of the reinforcing rod in Embodiment 1 of the automotive front wheel toe-in measuring tool of this utility model; Figure 9 This is a partial structural diagram of the left end of Embodiment 2 of the automotive front wheel toe-in measuring tool of this utility model; Figure 10 This is a structural diagram of the reinforcing rod in Embodiment 2 of the automotive front wheel toe-in measuring tool of this utility model.

[0018] In the diagram: 100, left front tire; 200, right front tire; 10, main measuring scale; 11, main graduation; 12, main through hole; 13, main tightening screw; 14, main connecting plate; 20, secondary measuring scale; 21, vernier scale; 22, window; 23, secondary through hole; 24, secondary tightening screw; 25, secondary connecting plate; 30, measuring rod; 31, rod body graduation; 32, pressure cap nut; 40, measuring needle; 50, reinforcing rod; 51, through hole; 52, tightening bolt; 53, connecting plate; 54, mounting hole. Detailed Implementation

[0019] To address the technical problems existing in the prior art, the basic concept of this utility model is to set a main scale on the main measuring scale and a vernier scale on the secondary measuring scale. The two measuring scales are slidably fitted together, which can change the total length. Furthermore, the measuring needles at the ends of the two measuring scales are positioned at the same measuring point on the tire when measuring at the front of the tire and when measuring at the rear of the tire. In this way, two measurement values ​​can be obtained, and the difference is the front wheel toe-in value. Moreover, since the measurement is performed using the scale difference between the main scale and the vernier scale, the measurement accuracy is higher.

[0020] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0021] The implementation method of the automotive front wheel toe-in value measuring tool of this utility model: like Figure 1 As shown, the car front wheel toe-in measurement tool includes a main measuring ruler 10 and a secondary measuring ruler 20, combined with... Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the main measuring ruler 10 has a main scale 11, which is disposed on the outer surface of the main measuring ruler 10 and arranged along the length of the main measuring ruler 10. Specifically, in this embodiment, the main scale 11 has 750 divisions from 0 to 750 mm, with each division being 1 mm, that is, the division value of the main scale 11 is 1 mm. In other embodiments, the number of divisions of the main scale can be changed according to the length of the main measuring ruler 10 and the auxiliary measuring ruler 20, and of course, the division value of the main scale can also be changed, for example, to 0.5 mm.

[0022] The auxiliary measuring scale 20 is equipped with a vernier scale 21 for measurement in conjunction with the main scale 11. This invention introduces the principle of graduated measurement, accurately measuring the front wheel toe-in value through the graduation difference between the main scale 11 and the vernier scale 21. Specifically, in this embodiment, the vernier scale 21 has 50 graduations, a total length of 49mm, and each graduation is 0.98mm, meaning the graduation value of the vernier scale 21 is 0.98mm, and the graduation difference with the main scale 11 is 0.02mm. Therefore, the measurement accuracy of the front wheel toe-in value measuring tool in this invention is 0.02mm, which is 50 times higher than the 1mm measurement accuracy in the prior art.

[0023] In other embodiments, the vernier scale 21 can also have 20 divisions, a total length of 19 mm, and a graduation value of 0.95 mm. The graduation difference between the vernier scale 21 and the main scale 11 is 0.05 mm, meaning the measurement accuracy of the tool is 0.05 mm. Alternatively, the vernier scale 21 can have 10 divisions, a total length of 9 mm, and a graduation value of 0.9 mm. The graduation difference between the vernier scale 21 and the main scale 11 is 0.1 mm, meaning the measurement accuracy of the tool is 0.1 mm, which is still an improvement over the measurement accuracy of existing technologies.

[0024] like Figure 1 and Figure 2 As shown, measuring rods 30 are vertically mounted at the ends of the main measuring ruler 10 and the auxiliary measuring ruler 20, respectively. The measuring rods 30 at both ends are parallel to each other, and measuring needles 40 are respectively mounted at their ends. The two measuring needles 40 are used to position and engage with the same measuring point on the left front tire 100 and the right front tire 200, respectively. To ensure measurement accuracy, the specific positioning and engagement method is that the measuring needles 40 are inserted into the tires. Of course, the measuring needles 40 are very short, and after the measurement, only a mark is left on the tire, which will not affect the normal use function of the tire.

[0025] The main measuring ruler 10 and the auxiliary measuring ruler 20 are slidably fitted together, allowing adjustment of their total length. Therefore, during measurement, the measuring needles 40 at both ends can be aligned with the center of the tire tread and inserted by sliding the two measuring rulers relative to each other. For example, when measuring at the rear of the tire, the measuring tool is kept horizontal, and the measuring needles 40 are inserted from back to front into the center of the tread of the left front tire 100 and the right front tire 200, respectively. A reading A can then be obtained through the main scale 11 and the vernier scale 21. Next, the left and right front tires are rotated forward 180 degrees (simply by moving the car forward a short distance). By adjusting the total length of the two measuring rulers, the same measuring point on the left and right front tires can be measured again at the front of the tires, yielding a reading B. The difference between A and B is the front wheel toe-in value. Alternatively, the measurement can be performed at the front of the tire first, then the left and right front tires are rotated 180 degrees backward, and the measurement is then taken at the rear of the tire; the principle is the same. Because the measurement is performed using the difference between the main scale and the vernier scale, the measurement accuracy is higher.

[0026] Furthermore, since the main scale 11 starts from zero, and the zero scale extends to the end of the main measuring scale 10 ( Figure 1 There is a gap between the middle and left ends, so readings A and B are not the actual distance between the measuring points on the left front tire and the right front tire, but just two values. The purpose is only to find the difference. This makes the setting of the starting position and total length of the main scale 11 more flexible. It can be designed according to the length of the main measuring scale 10 and the auxiliary measuring scale 20, as well as the applicable measurement range.

[0027] In this embodiment, the length of the secondary measuring ruler 20, plus the portion of the main measuring ruler 10 without graduations, allows the measuring tool to be used for a range of front wheel track widths of 1200mm-2200mm, providing a wide range of applications and covering various common vehicles on the market. Of course, in other embodiments, the applicable range may vary depending on the lengths of the main measuring ruler 10 and the secondary measuring ruler 20, the starting position and total length of the main scale 11, and the position of the vernier scale 21. In other embodiments, the zero mark of the main scale 11 may be based on the measuring needle, or the main scale 11 may not start from zero, but the starting mark may include the distance to the measuring needle. In these cases, the two measuring needles can detect the actual distance between the measuring points on the left and right front tires. This also requires the main measuring ruler 10 to have sufficient length, and the total length of the main scale 11 to meet the front wheel track width requirements of various vehicles, similar to a vernier caliper.

[0028] In this embodiment, the auxiliary measuring scale 20 is cylindrical, and the main measuring scale 10 is inserted into the auxiliary measuring scale 20, such as... Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the secondary measuring scale 20 has a window 22 on its cylindrical wall to expose the main scale 11, and the vernier scale 21 is set along the edge of the window 22. In this way, a cylindrical material can be used to make the secondary measuring scale 20. Only a window 22 needs to be machined into the cylindrical wall of the secondary measuring scale 20, and the outline of the main measuring scale 10 can be adapted to it, which is convenient for material selection and manufacturing.

[0029] Furthermore, the window 22 extends in the left and right direction, and the vernier scale 21 is located near the left end of the window 22. This makes full use of the length advantage and ensures that the measuring tool has a relatively large measuring range.

[0030] Specifically, in material selection, both the main measuring scale 10 and the auxiliary measuring scale 20 can be cylindrical, meaning they can be made from round tubes. This is convenient in terms of material availability, lightweight, and allows for smooth sliding. Alternatively, the auxiliary measuring scale 20 can be cylindrical, while the main measuring scale 10 can be a solid round rod. In other embodiments, both the main measuring scale 10 and the auxiliary measuring scale 20 can be flat rectangular tubes, meaning they can be made from flat tubes. In this case, both the main scale 11 and the vernier scale 21 are on a plane, facilitating the processing and observation of the scales. Alternatively, the auxiliary measuring scale 20 can be flat rectangular tubes, while the main measuring scale 10 can be a solid flat steel.

[0031] In other embodiments, neither the main measuring scale 10 nor the auxiliary measuring scale 20 may be cylindrical. For example, the main measuring scale 10 may be plate-shaped, and the auxiliary measuring scale 20 may be provided with a U-shaped groove. The auxiliary measuring scale 20 is secured to the outside of the main measuring scale 10 through the U-shaped groove and is slidably fitted with the main measuring scale 10, similar to the structure of a vernier caliper. In this case, there is no need to open a window, and the opening of the U-shaped groove naturally forms a structure that exposes the main scale.

[0032] In this embodiment, the positions of the measuring rods 30 at both ends are adjustable, which can change the extension length relative to the main measuring ruler 10 and the auxiliary measuring ruler 20, so as to avoid interference between the measuring tool and other structural components of the vehicle during measurement, which would affect the measurement work or the accuracy of the measurement data.

[0033] Specifically, the ends of the main measuring scale 10 and the auxiliary measuring scale 20 are respectively provided with through holes for the measuring rod 30 to pass through. The ends of the main measuring scale 10 and the auxiliary measuring scale 20 are also respectively threaded with tightening screws for inserting into the through holes to tighten the measuring rod 30. In this way, the extension of the measuring rod 30 can be adjusted by sliding, which is convenient for adjustment. The position can be fixed well by the tightening screws to prevent the measuring rod 30 from moving.

[0034] Specifically, such as Figure 3 As shown, the main through hole 12 is on the main measuring scale 10, and the axis of the main through hole 12 is perpendicular to the axis of the main measuring scale 10; the tightening screw installed on the main measuring scale 10 is the main tightening screw 13. Figure 4 As shown, the perforation on the secondary measuring ruler 20 is the secondary perforation 23. The axis of the secondary perforation 23 is perpendicular to the axis of the secondary measuring ruler 20 and parallel to the axis of the main perforation 12. The tightening screw installed on the secondary measuring ruler 20 is the secondary tightening screw 24.

[0035] In other embodiments, multiple pin holes can be spaced along the length of the measuring rod 30. A pin passing through the main measuring scale 10 or the auxiliary measuring scale 20 is inserted into the corresponding pin hole to change the extension amount of the measuring rod 30. In other embodiments, the measuring rod 30 can be threadedly connected to the main measuring scale 10 or the auxiliary measuring scale 20, and its extension amount can be adjusted by screwing the measuring rod 30. Of course, in other embodiments, the measuring rod 30 can also be welded or bonded to the main measuring scale 10 or the auxiliary measuring scale 20, and its position cannot be adjusted.

[0036] Furthermore, to facilitate consistent control of the extension of the two measuring rods 30, such as... Figure 2 As shown, two measuring rods 30 are respectively provided with rod body scales 31 along the length direction. Of course, in other embodiments, the extension degree of the measuring rods 30 can also be measured by another measuring ruler, without setting scales on the measuring rods 30.

[0037] Furthermore, such as Figure 1 and Figure 2 As shown, the ends of the main measuring scale 10 and the auxiliary measuring scale 20 are respectively provided with reinforcing rods 50. One end of the reinforcing rod 50 is fixed to the corresponding measuring scale, and the other end is fixed to the corresponding measuring rod 30, thereby improving the installation strength between the measuring rod 30 and the corresponding measuring scale and reducing measurement errors.

[0038] Specifically, in this embodiment, the reinforcing rod 50 is a solid rod, and one end of the reinforcing rod 50 is fixed to the corresponding measuring scale by a locking bolt. For example... Figure 2 , Figure 3 and Figure 5 As shown, a main connecting plate 14 is provided near the end of the main measuring scale 10. The main connecting plate 14 has a main connecting hole for connecting a locking bolt. The axis of the main connecting hole is perpendicular to the axis of the main through hole 12, thus achieving fixation to one end of the reinforcing rod 50. Similarly... Figure 4 and Figure 6 As shown, a secondary connecting plate 25 is provided near the end of the secondary measuring scale 20. The secondary connecting plate 25 is provided with a secondary connecting hole for connecting the locking bolt. The axis of the secondary connecting hole is perpendicular to the axis of the secondary through hole 23, so as to fix it to one end of the reinforcing rod 50.

[0039] like Figure 8 As shown, a connecting plate 53 is provided at one end of the reinforcing rod 50. The connecting plate 53 is provided with mounting holes 54 corresponding to the main connecting hole or the auxiliary connecting hole for installing locking bolts. Each reinforcing rod has three mounting holes 54, three main connecting holes, and three auxiliary connecting holes, meaning that the ends of both reinforcing rods 50 are connected by three locking bolts to ensure a reliable connection. In other embodiments, the connection between the reinforcing rod 50 and the corresponding measuring scale can also be a riveted connection, a snap-fit ​​connection, etc.

[0040] Combination Figure 2 and Figure 8 As shown, the other end of the reinforcing rod 50 is provided with a through hole 51 for the measuring rod 30 to pass through, and this end is also threaded with a clamping bolt 52 for extending into the through hole 51 to tighten the measuring rod 30, which facilitates relative movement between the reinforcing rod 50 and the measuring rod 30, and facilitates locking the reinforcing rod 50. Since the same measuring rod 30 passes through, the through hole 51 is coaxial with the aforementioned main through hole 12 or secondary through hole 23. In other embodiments, a clamp can also be provided at the end of the reinforcing rod 50, and the measuring rod 30 can be clamped by installing bolts on the clamp.

[0041] Furthermore, in this embodiment, the main measuring ruler 10 and the corresponding reinforcing rod 50 and measuring rod 30 are arranged in a triangle, and the auxiliary measuring ruler 20 and the corresponding reinforcing rod 50 and measuring rod 30 are also arranged in a triangle, and all of them are isosceles right triangles, which further enhances the structural strength and ensures that the relative position between the measuring rod 30 and the corresponding measuring ruler does not change when the tool is used, thus ensuring that the measurement results are accurate and reliable.

[0042] like Figure 8 As shown, to facilitate the arrangement of an isosceles right triangle, the angle between the axis of the perforation 51 and the axis of the main body of the reinforcing rod 50 is 45 degrees. Furthermore, one end of the perforation 51 is aligned with the outer surface of the main body of the reinforcing rod 50, while the other end is arranged at an angle. This avoids the formation of a sharp point at the end of the reinforcing rod 50 when both ends are aligned, which could easily interfere with the tire and affect measurement operations. In other embodiments, when the angle between the axis of the perforation 51 and the axis of the main body of the reinforcing rod 50 is other angles, such as 60 degrees, it is no longer an isosceles right triangle.

[0043] In other embodiments, such as Figure 9 and Figure 10 As shown, in this embodiment, the axis of the through hole 51 is perpendicular to the axis of the main body of the reinforcing rod 50, so the reinforcing rod 50 is parallel to the main measuring scale 10. Simultaneously, the axis of the mounting hole 54 at the end of the reinforcing rod 50 is parallel to the axis of the through hole 51, at which point the end of the reinforcing rod 50 is fixed to the end face of the main connecting plate 14 by locking bolts. Of course, the installation method of the reinforcing rod 50 on one side of the auxiliary measuring scale 20 is the same, and the structures on both sides are symmetrical.

[0044] Of course, in other embodiments, the reinforcing rod 50 may not be provided, and the position of the measuring rod 30 may be fixed solely by the fixing strength between the measuring rod 30 and the corresponding measuring ruler.

[0045] In addition, such as Figure 2As shown, in this embodiment, the measuring needle 40 is detachably connected to the end of the measuring rod 30 via the cap nut 32. After the measurement is completed at the front or rear of the tire, the measuring needle 40 remains on the tire and rotates 180 degrees with the tire. In this way, after the measurement is made on one side and the tire rotates 180 degrees, there is no need to search for the needle mark left after the previous measurement and re-insert the measuring needle 40. Instead, the measuring needle 40 can be reconnected to the measuring rod 30 via the cap nut 32 to perform the next measurement.

[0046] It should be noted that the specific structure of the detachable connection of the measuring needle 40 via the pressure cap nut 32 is existing technology, such as the needle connection methods disclosed in patents CN205432391U, CN205562254U, CN208432580U, CN212140489U, CN217988937U, etc. This utility model will not elaborate on it in detail. In short, the pressure cap nut 32 is rotatable relative to the measuring needle 40. When the measuring needle 40 is stuck in the tire, the connection between the measuring needle 40 and the measuring rod 30 can be achieved by simply rotating the pressure cap nut 32, without needing to rotate the measuring needle 40.

[0047] In practice, both the cap nut 32 and the measuring needle 40 can be left on the tire together. The two components are very small and do not affect the tire's smooth rotation. Alternatively, only the measuring needle 40 can be left on the tire. For example, after measuring one side, the cap nut 32 can be loosened to remove both the cap nut 32 and the measuring needle 40, and then the measuring needle 40 can be inserted back into the tire. Since the tire is stationary at this time, it is easier to operate. Leaving the measuring needle 40 on the tire allows you to know where the previous measurement point was. When the tire has rotated 180 degrees and needs to be connected to the measuring rod 30, first pull out the measuring needle 40, put on the cap nut 32, and then insert the measuring needle 40 again. Again, since the tire is stationary at this time, the needle mark is easier to align.

[0048] Of course, in other embodiments, the measuring needle 40 can be fixed in a non-removable manner, such as by welding or bonding. In this case, after the measurement on one side is completed, the measuring needle 40 needs to be pulled out. After the tire rotates 180 degrees, find the needle hole mark left by the previous measurement and re-insert the measuring needle 40 according to the needle hole mark to ensure that the two measurements are of the same measuring point.

[0049] In other embodiments, if the measuring needle 40 has its own rod, the measuring needle 40 can be directly fixed to the end of the measuring ruler. The specific fixing method can be the tightening screw, threaded connection, pin connection, welding or bonding, etc.

[0050] The usage process of the automotive front wheel toe-in value measuring tool in this utility model is as follows: (1) Tool pre-installation: Pre-install the measuring rod 30 and the corresponding measuring ruler. According to the vehicle conditions, make the measuring rod 30 extend appropriately to avoid interference between the measuring tool and other structural parts of the vehicle during measurement, which may affect the measurement work or the accuracy of the measurement data. According to the scale 31 on the rod body of the measuring rod 30, ensure that the extension length of the left and right measuring rods 30 is consistent. At the same time, note that the measuring rod 30 needs to reserve a position for installing the reinforcing rod 50.

[0051] (2) Inspect the vehicle and assemble the tools: The vehicle to be inspected is parked in a level pit. A routine inspection is carried out on the chassis, steering, suspension, axle and wheel and tire systems. After eliminating abnormalities such as wear, looseness, cracking, jamming, oil leakage and insufficient air pressure, the measurement begins. The two front wheels of the vehicle are on the ground (not in a supported state). The pre-installed measuring tools are tested and placed in front of and behind the front wheels of the vehicle. After confirming that there is no interference, the reinforcing rod 50 is installed. All connecting parts are installed firmly and reliably, and the locking device is effective. Ensure that the relative position of the measuring rod 30 and the corresponding measuring ruler does not change after installation.

[0052] (3) Measurement: Remove the measuring needle 40 and the pressure cap nut 32 from the measuring rod 30. Insert the two measuring needles 40 into the tire tread patterns at the same height on the rear of the left front tire 100 and the right front tire 200, respectively, to locate the two measuring points. In principle, the insertion position should be based on the wheel centerline in the height direction. In practice, it is advisable to ensure that there is no interference with the actual vehicle and that the measuring tools are not obstructed. Then, adjust the extension and retraction of the main measuring ruler 10 and the auxiliary measuring ruler 20 to a suitable position. Connect and lock the measuring rods 30 at both ends of the left and right ends to the measuring needles 40 on the tires using the pressure cap nut 32. Install the measuring rods 30 until the end of the pressure cap nut 32 is against the tire tread pattern. After installation, the measuring needles 40 cannot be seen from the outside. This can minimize the risk of the measuring needles 40 being bent and affecting the relative position between the main measuring ruler 10 and the auxiliary measuring ruler 20, thus affecting the measurement accuracy.

[0053] (4) Reading: Keeping the relative positions of the main measuring scale 10 and the auxiliary measuring scale 20 unchanged, read the value through the main scale and the vernier scale to obtain a reading A. The reading of the main scale is based on the integer value of the main scale to the left of the 0 mark on the vernier scale; the reading of the vernier scale is based on the sequence number of the vernier scale aligned with the main scale; the final data A = integer value of the main scale + vernier scale alignment sequence number * 0.02. This data is only for data recording and has no guiding significance; the front wheel toe-in is the difference.

[0054] (5) Remeasurement: Separate the measuring rod 30 from the measuring needle 40, place the measuring tool horizontally on the ground for later use, leave the measuring needle 40 on the tire tread without removing it, drive the vehicle forward, and the distance traveled should be half a circle of the front wheel (180° forward). The position of the measuring needle 40 should be at the same height as the position in step (3) and the measuring tool should not interfere or obstruct the normal measurement. Repeat step (3).

[0055] (6) Read the reading again: The reading method is the same as in step (4), and the reading B is obtained. The reading of the main scale is based on the integer of the main scale to the left of the 0 mark of the vernier scale; the reading of the vernier scale is based on the sequence number of the vernier scale aligned with the main scale; the final data B = integer of the main scale + vernier scale alignment sequence number * 0.02. This data is only used for data recording and has no guiding significance. The front wheel toe-in is the difference.

[0056] (7) Calculate the front wheel toe-in value: front wheel toe-in value = AB.

[0057] (8) After comparing the measured value with the required value, the vehicle can be adjusted, and then the above steps can be repeated to measure the front wheel toe value again until the front wheel toe value meets the requirements. Then the tools can be removed and the construction is completed.

[0058] This utility model's measuring tool solves the problems of inaccurate and poor precision in manual front wheel toe-in measurements. It structurally eliminates measurement errors caused by human factors, resulting in higher accuracy and faster resolution of abnormal tire wear and handling issues, thus improving repair efficiency. Furthermore, this utility model significantly improves measurement precision from 1mm in traditional methods to 0.02mm, greatly enhancing repair quality for abnormal tire wear and handling problems in areas without four-wheel alignment capabilities. In addition, this measuring tool is applicable to measuring front wheel toe-in of various common vehicle types, offering high utilization and a good return on investment.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A tool for measuring the toe-in value of automobile front wheels, characterized in that, It includes a main measuring scale and a secondary measuring scale. The main measuring scale has a main scale, and the secondary measuring scale has a vernier scale for measurement in conjunction with the main scale. The ends of the main measuring scale and the secondary measuring scale are equipped with measuring needles for positioning and engaging with the same measuring point on the left front tire and the right front tire, respectively. The main measuring scale and the secondary measuring scale are slidably fitted together to adjust the total length of the two measuring scales, and are used to read the reading A when the same measuring point on the left front tire and the right front tire is at the rear of the tire and the reading B when it is at the front of the tire through the main scale and the vernier scale. The difference between A and B is the front wheel toe-in value.

2. The vehicle front wheel toe-in measuring tool according to claim 1, characterized in that, The ends of the main measuring scale and the auxiliary measuring scale are respectively vertically mounted with adjustable measuring rods, and the measuring rods at both ends are parallel to each other and are respectively mounted with measuring needles.

3. The vehicle front wheel toe-in measuring tool according to claim 2, characterized in that, The ends of the main measuring scale and the auxiliary measuring scale are respectively provided with through holes for the measuring rod to pass through. The ends of the main measuring scale and the auxiliary measuring scale are also respectively threaded with tightening screws for inserting into the through holes to tighten the measuring rod.

4. The vehicle front wheel toe-in measuring tool according to claim 2, characterized in that, The measuring rod has graduations along its length.

5. The vehicle front wheel toe-in measuring tool according to any one of claims 2 to 4, characterized in that, The ends of the main measuring scale and the auxiliary measuring scale are also equipped with reinforcing rods. One end of the reinforcing rod is fixed to the main measuring scale or the auxiliary measuring scale, and the other end is fixed to the corresponding measuring rod.

6. The vehicle front wheel toe-in measuring tool according to claim 5, characterized in that, The main measuring scale, its corresponding reinforcing rod, and measuring rod are arranged in a triangle, as are the secondary measuring scale, its corresponding reinforcing rod, and measuring rod.

7. The vehicle front wheel toe-in measuring tool according to claim 5, characterized in that, One end of the reinforcing rod is fixed to the main measuring scale or the auxiliary measuring scale by a locking bolt, and the other end is provided with a through hole for the measuring rod to pass through, and this end is also threaded with a tightening bolt for inserting into the through hole to tighten the measuring rod.

8. The vehicle front wheel toe-in measuring tool according to any one of claims 2 to 4, characterized in that, The measuring needle is detachably connected to the end of the measuring rod via a cap nut, so that after measuring the front or rear of the tire, the measuring needle remains on the tire and rotates 180 degrees with the tire.

9. The vehicle front wheel toe-in measuring tool according to any one of claims 1 to 4, characterized in that, The secondary measuring scale is cylindrical, with the main measuring scale inserted inside. A window is provided on the cylindrical wall of the secondary measuring scale to expose the main scale, and the vernier scale is set along the edge of the window.

10. The vehicle front wheel toe-in measuring tool according to any one of claims 1 to 4, characterized in that, The main scale starts from zero, and there is a gap between the zero scale and the end of the main measuring scale.

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