Device and method for measuring axial clearance of half shaft of front-drive steering axle of heavy truck

Abstract

The invention relates to the technical field of vehicle axle axial clearance detection, in particular to a heavy truck front drive steering axle half shaft axial clearance measuring device and method. The device comprises a measuring dial indicator, a measuring tool is installed on the end face, making contact with a measuring head, of the measuring dial indicator, the measuring tool is used for applying force to the end face of the half-shaft thrust washer and driving the end face of the half-shaft thrust washer to axially deform, and force is further applied to the half-shaft thrust washer through swing of a counter-force limiting pin. The measuring dial indicator is used for measuring the deformation of the end face of the half-shaft thrust washer. The measuring dial indicator is used for direct measurement, the design of the measuring tool is combined, inaccuracy caused by elastic deformation and operation errors in traditional feeler gauge measurement can be effectively reduced, the design of the counter-force cross and the counter-force limiting pin of the measuring tool can standardize force applied to the half-shaft thrust washer, and the measuring accuracy is improved. Measurement errors caused by different force application habits of operators are reduced, and repeatability and stability of the measurement process are ensured.

Description

Technical Field

[0001] This invention relates to the technical field of axial clearance detection of vehicle wheel axles, and in particular to a device and method for measuring the axial clearance of the half-shaft of a front-wheel drive steering axle of a heavy-duty truck. Background Technology

[0002] The universal joint shaft and wheel-side thrust washers of the front-drive axle need to be controlled within a certain range of process parameters. Excessive clearance will cause abnormal noise during the operation of the front-drive axle assembly, and in severe cases, may cause the wheel hub to fall off. Insufficient clearance will cause wear, overheating, or jamming of the half-shaft and wheel-side assembly of the front-drive axle assembly, which may lead to damage to the planetary gears and other adverse factors, resulting in driving safety hazards. In the manufacturing and maintenance of heavy-duty truck front-drive steering axles, the accurate measurement of the axial clearance of the half-shaft is an important part of ensuring the safety and performance of vehicle operation. The traditional clearance measurement method mainly relies on the use of feeler gauges. This method has obvious limitations in practice, affecting the accuracy and reliability of the measurement.

[0003] As a measuring tool, feeler gauges are prone to elastic deformation due to their material and design. This deformation introduces additional errors during measurement, affecting the accuracy of the results. Feeler gauges are also easily damaged standard parts, susceptible to wear and tear during use. They are also highly influenced by user habits, gradually losing accuracy and increasing product defect rates. The limitation of feeler gauge testing lies in its "point measurement" characteristic. For scenarios requiring measurement of large areas or complex structures, such as wheel assemblies, point measurement cannot comprehensively reflect changes in the entire clearance, leading to uncontrollable measurement errors. Furthermore, feeler gauge testing can only provide fixed measurement results, rendering it ineffective for scenarios requiring dynamic adjustment or precise clearance control.

[0004] Publication No. CN222505254U discloses a rapid axial clearance measuring device, including a thrust rod and a dial indicator for measuring clearance. The thrust rod has a thrust handle at its front end and a reaction sleeve at its rear end. The front end of the reaction sleeve is connected to the thrust rod, and the rear end of the reaction sleeve can be fitted onto the end of a half-shaft assembly. A threaded connecting rod located inside the reaction sleeve is coaxially connected to the rear end of the thrust rod. A connecting screw hole corresponding to the threaded connecting rod is opened at the axial center of the half-shaft assembly. The dial indicator for measuring clearance is fixed on a connecting mechanism and is connected to the planetary carrier assembly via the connecting mechanism, with the measuring end of the dial indicator contacting the reaction sleeve. The thrust handle in this technology requires a connecting screw hole corresponding to the threaded connecting rod at the axial center of the half-shaft assembly. Since there is no dedicated threaded hole in the middle of the half-shaft thrust washer, measurement is not possible, resulting in a narrow applicability range. Summary of the Invention

[0005] To address the limitations of traditional feeler gauge measurement in terms of accuracy, service life, and measurement area, and to improve measurement accuracy and reduce product defect rate, this invention provides a device and method for measuring the axial clearance of the half-shaft of a front-drive steering axle in heavy-duty trucks.

[0006] On the one hand, the axial clearance measuring device for the half-shaft of a front-wheel drive steering axle of a heavy-duty truck provided by the present invention adopts the following technical solution: A device and method for measuring the axial clearance of a half-shaft of a heavy-duty truck front-drive steering axle includes a dial indicator. The dial indicator is fixedly mounted on the wheel hub assembly, with its measuring head in close contact with the measuring end face. A measuring fixture is mounted on the end face of the dial indicator's measuring head. This fixture applies force to the end face of the half-shaft thrust washer and drives its axial deformation. The measuring fixture includes a reaction cross and a reaction limit pin. The reaction limit pin is mounted on the side of the reaction cross facing the half-shaft thrust washer. During use, the reaction limit pin is aligned with a pre-drilled hole on the end face of the half-shaft thrust washer. The reaction cross controls the swing of the reaction limit pin by rotation, and the swing of the reaction limit pin further applies force to the half-shaft thrust washer. The dial indicator measures the deformation of the end face of the half-shaft thrust washer.

[0007] By using a dial indicator for direct measurement, combined with the design of the measuring fixture, the inaccuracies caused by elastic deformation and operational errors in traditional feeler gauge measurements can be effectively reduced. This direct contact measurement method ensures the accuracy and consistency of the data. The design of the reaction cross and reaction limit pin of the measuring fixture can standardize the force applied to the half-shaft thrust washer, reducing measurement errors caused by different force application habits of operators. Through the guidance and control of the mechanical structure, the repeatability and stability of the measurement process are ensured. This device, through the cooperation of the reaction limit pin and the reserved round hole on the end face of the half-shaft thrust washer, can be used on complex wheel edges. Precise measurements are taken within the assembly structure, overcoming the limitations of traditional feeler gauges in "point measurement." This allows for a comprehensive reflection of changes in the overall clearance. The dial indicator provides real-time measurement results, enabling real-time monitoring of axial clearance changes during assembly or maintenance. This real-time monitoring capability helps to promptly identify and correct problems during assembly, reducing post-assembly failures and rework. By precisely controlling the axial clearance of the half-shaft thrust washer, wear between the half-shaft and the wheel assembly can be effectively reduced, minimizing heat generation and jamming. This, in turn, avoids problems such as planetary gear damage, extends the overall vehicle lifespan, and improves vehicle operational safety.

[0008] Furthermore, a rotating frame is hinged at the center of the reaction cross, and a buckle is provided at the end of the rotating frame. A flexible cable is attached to the buckle, and the rotating frame is controlled to swing by pulling on the flexible cable.

[0009] The design of the articulated rotating frame and flexible cable allows operators to flexibly apply or adjust the reaction force, ensuring a smoother and more controllable force application process for the half-shaft thrust washer. The combination of the buckle and the flexible cable makes the swing control of the reaction force cross more precise. Through meticulous mechanical adjustments, measurement errors caused by uneven force application can be further reduced, ensuring the accuracy and consistency of measurement results. The use of the flexible cable reduces the direct operation requirements for operators in confined spaces, improving operational comfort. Especially in complex wheel-side assembly structures, it can effectively reduce measurement errors caused by inconvenient operation.

[0010] Furthermore, the reaction cross and the rotating frame are respectively provided with fitting grooves at their junctions. The reaction cross and the rotating frame are connected to each other through the fitting grooves, and a swing gap is reserved between the fitting grooves of the reaction cross and the rotating frame.

[0011] The design of the interlocking slots allows for flexible connection and separation between the reaction cross and the rotating frame, facilitating processing, assembly, and use. By reserving a swing gap between the interlocking slots, the rotating frame can swing freely within a controlled range, which helps to control the magnitude of the applied force and avoid measurement errors caused by applying too little or too much force.

[0012] Furthermore, a rebound spring is installed on the rotating frame, and the direction of the rebound spring tension is opposite to the direction of the flexible cable tension.

[0013] The design of the spring spring allows the rotating frame to automatically return to its initial position after use. This automatic reset function simplifies the operation process, reduces the need for manual adjustment, and improves measurement efficiency. The automatic reset and stable force application mechanism can prevent parts from falling off or being damaged due to accidental loosening or improper force application, thus improving operational safety. Since the tension of the spring spring and the flexible cable are in opposite directions, they form a balanced force system during the force application process, making the force applied to the measuring components more stable and uniform, thereby improving measurement accuracy.

[0014] Furthermore, the reaction cross and the rotating frame are hinged together by rotating bolts, and the ends of the rotating bolts are provided with radial through holes and fixed by fixing pins.

[0015] The combination of the rotating bolt and the fixed pin provides a stable and reliable connection, ensuring a firm hinge between the reaction cross and the rotating frame, reducing the risk of loosening and falling off, and improving the safety and reliability of the device. By pre-drilling radial through holes at the end of the rotating bolt and using the fixed pin, the assembly and disassembly of the device become easier.

[0016] Furthermore, a thrust frame and a reaction handle are provided on the side of the reaction cross away from the half-shaft thrust washer. The reaction handle is slidably installed inside the thrust frame. The reaction handle is connected to the reaction cross and the rotating frame by a flexible cable. The reaction handle controls the relative swing of the reaction cross and the rotating frame by pulling the flexible cable.

[0017] By sliding the reaction handle inside the thrust frame, operators can more easily control the swing of the reaction cross and the rotating frame. The handle simplifies the measurement process, reduces reliance on complex tools, and improves operational efficiency. The sliding structure design of the reaction handle further optimizes the direction of force application, making it convenient for operators to use. The sliding installation design of the thrust frame and the reaction handle makes the entire device more compact, facilitating operation in confined spaces. The reaction handle is controlled by a flexible cable, reducing the need for operators to directly apply force to the device and alleviating physical exertion during prolonged operation.

[0018] Furthermore, one end of the thrust frame is provided with a thrust handle, and the other end is provided with a fixed frame. The reaction cross is fixedly installed on the fixed frame. A slider is installed on the reaction handle. The reaction handle is slidably installed in the slide groove of the thrust frame through the slider. A right-angle groove is opened through the fixed frame and the reaction cross. A bolt hole is opened at the end of the slider. The flexible cable passes through the right-angle groove and is bolted in the bolt hole.

[0019] The thrust frame and the reaction cross are stably connected by a fixed frame, which helps the entire device maintain structural stability during operation. The right-angle groove design provides a fixed path for the flexible cable, which transforms tangential force into axial force, preventing the cable from shifting during operation. The thrust handle design allows operators to easily hold and adjust the device, reducing operational difficulty and improving work efficiency.

[0020] Furthermore, the reaction limit pins are respectively installed at both ends of the reaction cross and at both ends of the rotating frame that rotates along the center of the reaction cross. The front end of the reaction limit pin is provided with a round head and the side is provided with a notched arc surface. The rear end of the reaction limit pin is provided with an installation step and an installation plug. The reaction limit pin is installed on the reaction cross and the rotating frame through the installation plug and is fixed by the installation bolt.

[0021] The round head design facilitates alignment and insertion into the hole of the half-shaft thrust washer. The notched arc surface design allows the reaction limit pin to better adapt to different angle changes during rotation. At the same time, the arc surface design prevents jamming during assembly and disassembly, ensuring the accuracy of the rotating frame's movement. The installation steps and plug design of the reaction limit pin simplify the installation process, allowing the reaction limit pin to be installed quickly and accurately. The combination of the round head and the notched arc surface reduces friction and wear during device rotation, helping to extend the service life of the reaction limit pin and the overall device.

[0022] Furthermore, the measuring micrometer is mounted on the wheel hub assembly via a fixed base, which is a strong magnet. The measuring micrometer is mounted on the fixed base via fixed support rods, which include at least two rods. The fixed support rods are connected to the fixed base via adjustable joints. Multiple fixed support rods are connected to each other via adjustable joints, and the adjustable joints control the swing adjustment of the fixed support rods.

[0023] The strong magnet mounting base can firmly adhere to the metal surface of the wheel assembly, providing stable support and preventing displacement due to vibration or external force during measurement. The strong magnetic adsorption avoids the slippage or loosening problems that may occur with traditional mechanical clamps. The use of strong magnets makes the installation process quick and simple, and it can be easily positioned and fixed without additional tools. Multiple support rods provide more support points, so that the dial indicator can remain stable in different positions and angles. The adjustable joint allows the mounting rods to swing and adjust in multiple dimensions, ensuring that the dial indicator can be accurately positioned to the required measurement position and angle to adapt to different measurement needs.

[0024] On the other hand, the method for measuring the axial clearance of the half-shaft of a front-drive steering axle of a heavy-duty truck provided by the present invention adopts the following technical solution: A method for measuring the axial clearance of the half-shaft of a front-drive steering axle in a heavy-duty truck involves applying force to a half-shaft thrust washer using a measuring fixture to cause axial deformation of the half-shaft thrust washer, and then measuring the axial deformation of the half-shaft thrust washer using a dial indicator. The method specifically includes the following measurement steps: Install the half-shaft thrust shim and adjusting shim at the wheel assembly; Install measuring fixtures on the half-shaft thrust washers, position and install a measuring dial indicator on the wheel hub assembly, and adjust the position of the measuring dial indicator; Drive the measuring fixture to its limit in the forward direction, and use a dial indicator to measure the thrust washer of the half shaft to obtain a1; Drive the measuring fixture in reverse to its limit, and use a dial indicator to measure the thrust washer of the half shaft to obtain a2; Calculate the relative value Δa = |a1 - a2|; Determine whether Δa is within the process range. If Δa is not within the process range, adjust the thrust shim of the half shaft using adjusting shims; otherwise, it is qualified.

[0025] By using a measuring fixture to perform bidirectional measurements on the half-shaft thrust washer through forward and reverse driving, the maximum and minimum values ​​of its axial deformation can be accurately obtained, improving measurement accuracy. The design of the measuring fixture and adjusting shim makes the installation process simple and quick, reducing operation time and complexity. By driving the measuring fixture to its limit in both directions, sufficient force is ensured during the measurement process to obtain accurate deformation data, achieving full circumference measurement, eliminating the defects of "point measurement", and enabling relative detection and calculation without the need for a special zero-point coordinate, thus realizing gap detection.

[0026] In summary, the present invention has the following beneficial technical effects: 1. By measuring in both directions, the maximum and minimum axial deformation values ​​of the half-shaft thrust shim can be accurately obtained, thus improving measurement accuracy.

[0027] 2. Standardize the design of measuring tooling for force application to avoid errors caused by different operator habits and ensure consistency.

[0028] 3. The use of quick-installation measuring fixtures and adjustment shims reduces operation time and complexity, and improves work efficiency.

[0029] 4. Use a strong magnet to fix the dial indicator, providing stable support and avoiding displacement and errors during the measurement process.

[0030] 5. The dial indicator provides real-time measurement results, which helps to monitor gap changes in real time during assembly or maintenance.

[0031] 6. The design of the flexible cable and reaction handle reduces the need for direct operation, improves operating comfort, and is especially suitable for narrow spaces.

[0032] 7. The return spring automatically resets the device, simplifying the operation process, reducing the need for manual adjustment, and improving measurement efficiency.

[0033] 8. The tight design of the reaction cross and the rotating frame ensures the stability of the entire device during operation and reduces the risk of loosening.

[0034] 9. The rounded head and notched arc surface reduce friction and wear, extending the service life of the reaction limit pin and the overall device.

[0035] 10. By adopting a stable mechanical structure and operational design, the risk of failure is reduced, and the safety and reliability of vehicle operation are improved. Attached Figure Description

[0036] Figure 1 This is a schematic diagram showing the installation of the dial indicator and measuring fixture in use according to the present invention; Figure 2 for Figure 1 A partial cross-sectional schematic diagram; Figure 3 This is a schematic diagram of the measuring tooling structure of the present invention; Figure 4 This is a schematic diagram of the reaction cross assembly structure of the measuring fixture of the present invention; Figure 5 This is a schematic diagram of a partial cross-sectional structure of the reaction cross of the present invention; Figure 6 This is a front view of the reaction cross of the present invention; Figure 7 This is a schematic diagram of the reverse side of the reaction cross of the present invention; Figure 8 This is a schematic diagram of the reaction force limiting pin structure of the present invention; Figure 9 for Figure 8 A schematic diagram of the cross-section along the AA direction; Figure 10 This is a flowchart of the axial clearance measurement method of the present invention.

[0037] Explanation of reference numerals in the attached figures: 1. Dial indicator; 11. Fixed support rod; 12. Adjustable joint; 13. Fixed base; 2. Measuring fixture; 21. Push frame; 211. Push handle; 212. Slide groove; 213. Fixed frame; 214. Right angle groove; 22. Reaction handle; 221. Slider; 222. Bolt hole; 23. Flexible cable; 24. Reaction cross; 241. Rotating frame; 240. Fitting groove; 242. Rotating bolt; 243. Fixed pin; 244. Buckle; 245. Rebound spring; 25. Reaction limit pin; 251. Round head; 252. Notched arc surface; 253. Mounting step; 254. Mounting plug; 255. Mounting bolt; 10. Half-shaft thrust shim; 20. Adjusting shim; 30. Wheel edge assembly; 40. Wheel hub assembly. Detailed Implementation

[0038] The following will be combined with the appendix Figures 1-10 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to 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 invention.

[0040] In the steering system of heavy-duty trucks, the axial clearance of the front-wheel drive steering axle half shaft is an important parameter that affects the vehicle's handling and safety. In order to ensure the normal operation of the vehicle and extend the service life of the components, it is necessary to measure and adjust this clearance regularly.

[0041] Excessive axial clearance can lead to steering instability and affect vehicle handling, especially at high speeds or under heavy loads. Improper clearance can cause excessive wear between components, accelerate the wear and tear of the steering system, increase maintenance costs, and may even lead to steering failure or other safety hazards, posing a danger to the driver and passengers.

[0042] Example 1: This invention discloses a device for measuring the axial clearance of the half-shaft of a front-wheel drive steering axle in heavy-duty trucks, with reference to... Figure 1 and Figure 2 The system includes a dial indicator 1, which is fixedly mounted on the hub assembly 40 during use, with its measuring head in close contact with the measuring end face. A measuring fixture 2 is mounted on the end face of the measuring head of the dial indicator 1. The measuring fixture 2 is used to apply force to the end face of the half-shaft thrust washer 10 and drive the end face of the half-shaft thrust washer 10 to deform axially. The measuring fixture 2 includes a reaction cross 24 and a reaction limit pin 25. The reaction limit pin 25 is installed on the side of the reaction cross 24 facing the half-shaft thrust washer 10. During use, the reaction limit pin 25 is aligned with the reserved round hole on the end face of the half-shaft thrust washer 10. The reaction cross 24 controls the swing of the reaction limit pin 25 by rotation, and the swing of the reaction limit pin 25 further applies force to the half-shaft thrust washer 10. The dial indicator 1 is used to measure the amount of deformation of the end face of the half-shaft thrust washer 10.

[0043] Ensure the vehicle is parked on a flat surface and at a complete stop. Turn off the engine and take safety precautions. Remove the front tires to expose the steering axle and half-shaft assembly. Secure the dial indicator 1 to the wheel hub assembly 40, ensuring the measuring head makes close contact with the measuring end face for accurate measurement. Fix the measuring fixture 2 to the measuring end face, with the reaction cross 24 facing the half-shaft thrust washer 10. Ensure the reaction limit pin 25 is aligned with the pre-drilled hole on the half-shaft thrust washer 10.

[0044] Adjust the position of the dial indicator 1 initially to ensure good contact between its measuring head and the measuring fixture. The measurement reading should be zero or the initial reading should be recorded. Control the swing of the reaction limit pin 25 by rotating the reaction cross 24. During the swing, the reaction limit pin 25 applies force to the half-shaft thrust washer 10, causing axial deformation of its end face. During the application of force, the dial indicator 1 will record the amount of deformation of the end face of the half-shaft thrust washer 10. Read the reading of the dial indicator 1 and record the amount of deformation of the half-shaft thrust washer 10.

[0045] The device applies a force to the half-shaft thrust washer 10 through the reaction limit pin 25, causing axial deformation of the washer. The dial indicator 1 records this deformation, and the axial clearance can be calculated.

[0046] Example 2: Based on Example 1, the following is added: Reference Figures 3-7 The reaction cross 24 is hinged to a rotating frame 241 at its center. The rotating frame 241 is provided with a buckle 244 at its end. The buckle 244 is fastened with a flexible cable 23. The rotating frame 241 is pulled by the flexible cable 23 to control its swing.

[0047] Reference Figures 3-7 The reaction cross 24 and the rotating frame 241 are respectively provided with fitting grooves 240. The reaction cross 24 and the rotating frame 241 are connected to each other through the fitting grooves 240. The fitting grooves 240 of the reaction cross 24 and the rotating frame 241 are reserved with swing gaps.

[0048] Reference Figure 4 A rebound spring 245 is installed on the rotating frame 241, and the tension direction of the rebound spring 245 is opposite to the tension direction of the flexible cable 23.

[0049] Reference Figure 3 and Figure 4 The reaction cross 24 and the rotating frame 241 are hinged together by rotating bolts 242. The end of the rotating bolts 242 has a pre-drilled radial through hole and is fixed by fixing pins 243.

[0050] By pulling the flexible cable 23, the swing of the rotating frame 241 is controlled, thereby applying force to the half-shaft thrust washer 10 through the reaction limit pin 25, causing its axial deformation. During the application of force, the dial indicator 1 will record the amount of deformation of the half-shaft thrust washer 10.

[0051] Release the flexible cable 23 to reset the return spring 245 to the rotating frame 241, ensuring the system returns to its initial state.

[0052] Example 3: Based on Example 1, the following is added: Reference Figures 3-7 The reaction cross 24 is provided with a thrust frame 21 and a reaction handle 22 on the side away from the half-shaft thrust washer 10. The reaction handle 22 is slidably installed inside the thrust frame 21. The reaction handle 22 is connected to the reaction cross 24 and the rotating frame 241 by a flexible cable 23. The reaction handle 22 controls the reaction cross 24 and the rotating frame 241 to swing back and forth by pulling the flexible cable 23.

[0053] Reference Figure 3 and Figure 4 The thrust frame 21 is provided with a thrust handle 211 at one end and a fixed frame 213 at the other end. The reaction cross 24 is fixedly installed on the fixed frame 213. A slider 221 is installed on the reaction handle 22. The reaction handle 22 is slidably installed in the slide groove 212 of the thrust frame 21 through the slider 221. A right-angle groove 214 is opened through the fixed frame 213 and the reaction cross 24. A bolt hole 222 is opened at the end of the slider 221. The flexible cable 23 passes through the right-angle groove 214 and is bolted in the bolt hole 222.

[0054] By forcefully pulling the reaction handle 22 through the thrust handle 211 on the thrust frame 21, the reaction handle slides smoothly in the groove 212 through the slider 221, pulling the flexible cable 23. The pulling of the flexible cable 23 will cause the reaction cross 24 and the rotating frame 241 to swing relative to each other, thereby applying force to the half-shaft thrust washer 10 through the reaction limit pin 25, causing its axial deformation. During the force application process, the dial indicator 1 will record the deformation of the half-shaft thrust washer 10 in real time.

[0055] The device controls the swing of the reaction cross 24 and the rotating frame 241 by pulling the reaction handle 22 and using the force transmission of the flexible cable 23, thereby applying force to the half-shaft thrust washer 10, causing it to deform axially. The dial indicator 1 records this deformation and accurately calculates the axial clearance. Throughout the process, the sliding component ensures the smoothness of operation, while the right-angle groove 214 design provides a flexible operating path.

[0056] When sliding the reaction handle 22, the force should be kept uniform to avoid excessive force that could damage the components or cause measurement errors.

[0057] Reference Figure 8 and Figure 9The reaction limit pins 25 are respectively installed at both ends of the reaction cross 24 and at both ends of the rotating frame 241 that rotates along the center of the reaction cross 24. The front end of the reaction limit pin 25 is provided with a round head 251 and the side is provided with a notched arc surface 252. The rear end of the reaction limit pin 25 is provided with an installation step 253 and an installation plug 254. The reaction limit pin 25 is installed on the reaction cross 24 and the rotating frame 241 through the installation plug 254 and is fixed by the installation bolt 255.

[0058] Reference Figure 1 The dial indicator 1 is mounted on the wheel hub assembly 40 via a fixed base 13, which is a strong magnet. The dial indicator 1 is mounted on the fixed base 13 via fixed support rods 11. The fixed support rods 11 include at least two rods, and the fixed support rods 11 and the fixed base 13 are connected by an adjusting joint 12. Multiple fixed support rods 11 are connected to each other by adjusting joints 12, and the adjusting joints 12 control the swing adjustment of the fixed support rods 11.

[0059] Install reaction limit pins 25 at both ends of the reaction cross 24, insert the mounting plug 254 into the mounting hole of the reaction cross 24, and fix it with mounting bolts 255. Ensure that the round head 251 faces the measurement direction and align the notch arc surface 252 to adjust the direction of the measuring force. Similarly, install reaction limit pins 25 at both ends of the rotating frame 241 to ensure that the mounting step 253 fits tightly against the mounting surface of the rotating frame 241 to ensure stability and accuracy.

[0060] The fixed base 13 is mounted on the hub assembly 40. Utilizing its strong magnetic properties, the base is firmly attached to the metal surface, providing a stable measurement base. By adjusting the joint 12, three fixed support rods 11 are mounted on the fixed base 13. Adjusting the joint 12 allows the fixed support rods to swing and adjust their angle so that the dial indicator 1 can be aligned with the deformation direction of the half-shaft thrust washer 10.

[0061] Example 4: This invention discloses a method for measuring the axial clearance of the half-shaft of a front-drive steering axle in heavy-duty trucks, referring to... Figure 10 Using the heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device as described in Examples 1-3, the measuring fixture 2 applies force to the half-shaft thrust shim 10 to cause axial deformation of the half-shaft thrust shim 10, and the axial deformation of the half-shaft thrust shim 10 is measured using a dial indicator 1. The specific measurement steps include the following: Install the half-shaft thrust shim 10 and the adjusting shim 20 at the wheel edge assembly 30; Install measuring fixture 2 on half-shaft thrust washer 10, position and install measuring dial indicator 1 on hub assembly 40 and adjust the position of measuring dial indicator 1; Drive the measuring fixture 2 to its limit in the forward direction, and use the measuring dial indicator 1 to measure the thrust washer 10 of the half shaft to obtain a1; Drive the measuring fixture 2 in reverse to its limit, and use the measuring dial indicator 1 to measure the half-shaft thrust washer 10 to obtain a2; Calculate the relative value Δa = |a1 - a2|; Determine whether Δa is within the process range. If Δa is not within the process range, adjust the half-shaft thrust shim 10 using the adjusting shim 20; otherwise, it is qualified.

[0062] Determine whether Δa is within the preset process range. If Δa meets the standard range, the measurement is qualified; if not, adjustment is required.

[0063] If the measurement is not up to standard, use the adjusting shim 20 to adjust the position of the half-shaft thrust shim 10. Select an adjusting shim 20 of appropriate thickness according to the specific measurement value.

[0064] Repeat the forward and reverse measurements, record the new a1 and a2, and calculate the new Δa.

[0065] Repeat this process until Δa meets the process standards.

[0066] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the invention, and all such modifications and additions should fall within the protection scope of the present invention.

Claims

1. A device for measuring the axial clearance of a half-shaft of a front-drive steering axle of a heavy-duty truck, comprising a dial indicator (1), wherein the dial indicator (1) is fixedly mounted on the wheel hub assembly (40) during use, and the measuring head is in close contact with the measuring end face, characterized in that: The measuring micrometer (1) has a measuring fixture (2) installed on the end face of the measuring head. The measuring fixture (2) is used to apply force to the end face of the half-shaft thrust washer (10) and drive the end face of the half-shaft thrust washer (10) to deform axially. The measuring fixture (2) includes a reaction cross (24) and a reaction limit pin (25). The reaction limit pin (25) is installed on the side of the reaction cross (24) facing the half-shaft thrust washer (10). When in use, the reaction limit pin (25) is aligned with the reserved round hole on the end face of the half-shaft thrust washer (10). The reaction cross (24) controls the swing of the reaction limit pin (25) by rotation, and further applies force to the half-shaft thrust washer (10) by the swing of the reaction limit pin (25). The measuring micrometer (1) is used to measure the amount of deformation of the end face of the half-shaft thrust washer (10).

2. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 1, characterized in that: The reaction cross (24) is hinged to a rotating frame (241) at its center. The rotating frame (241) is provided with a buckle (244) at its end. The buckle (244) is connected to a flexible cable (23). The rotating frame (241) is pulled by the flexible cable (23) to control its swing.

3. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 2, characterized in that: The reaction cross (24) and the rotating frame (241) are respectively provided with fitting grooves (240). The reaction cross (24) and the rotating frame (241) are connected to each other through the fitting grooves (240). The fitting grooves (240) of the reaction cross (24) and the rotating frame (241) are reserved with swing gaps.

4. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 2, characterized in that: A spring (245) is installed on the rotating frame (241), and the tension direction of the spring (245) is opposite to that of the flexible cable (23).

5. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 2, characterized in that: The reaction cross (24) and the rotating frame (241) are hinged together by rotating bolts (242). The end of the rotating bolts (242) has a pre-drilled radial through hole and is fixed by fixing pins (243).

6. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 1, characterized in that: The reaction cross (24) is provided with a thrust frame (21) and a reaction handle (22) on the side away from the half-shaft thrust washer (10). The reaction handle (22) is slidably installed inside the thrust frame (21). The reaction handle (22) is connected to the reaction cross (24) and the rotating frame (241) by a flexible cable (23). The reaction handle (22) controls the reaction cross (24) and the rotating frame (241) to swing relative to each other by pulling the flexible cable (23).

7. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 6, characterized in that: The thrust frame (21) is provided with a thrust handle (211) at one end and a fixed frame (213) at the other end. The reaction cross (24) is fixedly installed on the fixed frame (213). A slider (221) is installed on the reaction handle (22). The reaction handle (22) is slidably installed in the groove (212) of the thrust frame (21) through the slider (221). A right-angle groove (214) is opened through the fixed frame (213) and the reaction cross (24). A bolt hole (222) is opened at the end of the slider (221). The flexible cable (23) passes through the right-angle groove (214) and is bolted in the bolt hole (222).

8. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 1, characterized in that: The reaction limit pins (25) are respectively installed at both ends of the reaction cross (24) and at both ends of the rotating frame (241) that rotates along the center of the reaction cross (24). The front end of the reaction limit pin (25) is provided with a round head (251) and the side is provided with a notched arc surface (252). The rear end of the reaction limit pin (25) is provided with an installation step (253) and an installation plug (254). The reaction limit pin (25) is installed on the reaction cross (24) and the rotating frame (241) through the installation plug (254) and is fixed by the installation bolt (255).

9. The heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device according to claim 1, characterized in that: The measuring micrometer (1) is mounted on the hub assembly (40) via a fixed base (13), the fixed base (13) being a strong magnet. The measuring micrometer (1) is mounted on the fixed base (13) via a fixed support rod (11), the fixed support rod (11) comprising at least two rods, and the fixed support rod (11) and the fixed base (13) are connected by an adjusting joint (12). Multiple fixed support rods (11) are connected to each other via adjusting joints (12), and the adjusting joint (12) controls the swing adjustment of the fixed support rod (11).

10. A method for measuring the axial clearance of the half-shaft of a front-drive steering axle in a heavy-duty truck, characterized in that, Using the heavy-duty truck front-drive steering axle half-shaft axial clearance measuring device as described in any one of claims 1-9, the measuring fixture (2) applies force to the half-shaft thrust washer (10) to cause axial deformation of the half-shaft thrust washer (10), and the axial deformation of the half-shaft thrust washer (10) is measured using a measuring dial indicator (1). The specific measurement steps include the following: Install the half-shaft thrust shim (10) and adjusting shim (20) at the wheel-side assembly (30); Install measuring fixture (2) on the half-shaft thrust washer (10), position and install measuring dial indicator (1) on the hub assembly (40) and adjust the position of measuring dial indicator (1); Drive the measuring fixture (2) to the limit in the positive direction, and use the measuring dial indicator (1) to measure the thrust washer (10) of the half shaft to obtain a1; Drive the measuring fixture (2) in reverse to the limit, and use the measuring dial indicator (1) to measure the thrust washer (10) of the half shaft to obtain a2; Calculate the relative value Δa = |a1 - a2|; Determine whether Δa is within the process range. If Δa is not within the process range, adjust the half-shaft thrust shim (10) using the adjusting shim (20). Otherwise, it is qualified.

Images