large gear wheel

Abstract

The application discloses a large gear, belongs to the technical field of gear devices, and is directly connected with a universal joint of a balancing machine through a stop opening and a threaded hole of an axle head of a wheel shaft, so that the purchase or manufacturing investment of a dynamic balancing joint is reduced, and the accuracy of detection data is improved. The main technical scheme of the application is as follows: the large gear comprises a wheel shaft; a stop opening is arranged on an axle head of the wheel shaft, and the stop opening is used for being plugged and matched with an interface of a universal joint of a balancing machine; a plurality of threaded holes are further arranged on the axle head of the wheel shaft, the plurality of threaded holes are located on the outer circumferential side of the stop opening, and the wheel shaft and the universal joint of the balancing machine are fixedly connected through fasteners.

Description

Technical Field

[0001] This application belongs to the field of gear device technology, specifically relating to a large gear. Background Technology

[0002] As a core component of the transmission system, the rotational balance of the large gear directly affects the stability, noise level, and service life of the equipment. Therefore, during manufacturing or maintenance, it is necessary to perform dynamic balancing tests using a balancing machine to eliminate vibration problems caused by uneven mass distribution. During the testing process, the large gear must be precisely connected to the universal joint of the balancing machine to ensure synchronous and stable rotation, thus guaranteeing the accuracy of the balancing test data. Currently, the industry commonly uses dynamic balancing joints to connect the large gear to the universal joint of the balancing machine. This method not only increases tooling costs but also, due to the complexity of some dynamic balancing joints, increases the operational difficulty of the large gear dynamic balancing test and may even adversely affect the testing accuracy. Utility Model Content

[0003] In view of this, this application provides a large gear that is directly connected to the universal joint of the balancing machine through the stop and threaded hole of the axle head, reducing the investment in purchasing or manufacturing dynamic balancing joints and improving the accuracy of test data.

[0004] To achieve the above objectives, this application mainly provides the following technical solutions: This application provides a large gear, including a wheel axle; the wheel axle has a stop on its axle head, the stop being used for insertion and mating with the interface of a balancing machine universal joint; the wheel axle also has a plurality of threaded holes, the plurality of threaded holes being located on the outer periphery of the stop, for fixing the wheel axle to the balancing machine universal joint by fasteners.

[0005] Optionally, the centerline of the stop is collinear with the centerline of the wheel axle.

[0006] Optionally, the fit clearance between the stop and the universal joint interface of the balancing machine is 0.01mm to 0.05mm.

[0007] Optionally, the axial length of the stop is 2 mm to 3 mm.

[0008] Optionally, the end of the stop for insertion into the universal joint interface of the balancing machine is provided with a conical surface, which can be adapted to the corresponding mating surface of the universal joint interface of the balancing machine to guide the stop into the universal joint interface of the balancing machine.

[0009] Optionally, a fillet is provided at the intersection of the end face of the wheel axle head and the outer peripheral surface of the stop, and the radius of the fillet is 1mm to 2mm.

[0010] Optionally, the plurality of threaded holes are evenly distributed circumferentially along the outer periphery of the stop, and the number of the threaded holes is the same as the number of screw holes on the universal joint connecting plate of the balancing machine.

[0011] Optionally, the center distance of the plurality of threaded holes is adapted to the center distance of the screw holes on the universal joint connecting plate of the balancing machine, so that the fastener can be sequentially passed through the screw holes on the universal joint connecting plate of the balancing machine and the threaded holes on the wheel axle head to fix the wheel axle and the universal joint of the balancing machine.

[0012] Optionally, the diameter of the threaded hole is adapted to the diameter of the screw hole on the universal joint connecting plate of the balancing machine, and the depth of the threaded hole is 1.2 to 1.5 times the diameter of the threaded hole.

[0013] Optionally, the large gear further includes a coupling, which is coaxially sleeved on the axle for connecting with external transmission components to transmit torque.

[0014] By employing the above technical solution, this application has at least the following beneficial effects: The large gear provided in the embodiments of this application, by setting a stop and an outer peripheral threaded hole on the shaft end, can achieve direct connection between the shaft and the universal joint of the balancing machine. Based on this, on the one hand, there is no need to use an additional dynamic balancing joint, directly saving the design, manufacturing or procurement costs of the dynamic balancing joint, significantly reducing tooling costs and solving the problem of high costs in traditional connection methods. On the other hand, the stop can quickly achieve precise insertion and positioning of the shaft and the universal joint of the balancing machine, and is fixed by fasteners with the outer peripheral threaded hole. This not only simplifies the connection structure between the large gear and the universal joint of the balancing machine, reduces the difficulty of dynamic balancing testing, and reduces the cumbersome operation caused by complex joints, but also avoids the adverse effects on testing accuracy that traditional dynamic balancing joints may have due to their own structural problems. This ensures that the shaft and the universal joint of the balancing machine rotate synchronously and stably, providing a reliable guarantee for the accuracy of balancing test data, thereby better ensuring the dynamic balancing test effect of the large gear, helping to improve the stability of subsequent equipment operation, reduce noise and extend the service life of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the axle from one perspective in an optional embodiment of this application; Figure 2 This is a structural schematic diagram of the wheel axle from another perspective in an optional embodiment of this application; Figure 3 This is a schematic diagram of the structure in an optional embodiment of this application, showing the wheel axle and the universal joint of the balancing machine in a connected state.

[0016] The reference numerals in the attached figures are as follows: 1. Axle; 2. Stop; 3. Universal joint of balancing machine; 4. Threaded hole; 5. Fastener; 6. Coupling. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] See also Figures 1 to 3 As shown, according to an embodiment of this application, a large gear is provided, including a wheel axle 1; the wheel axle 1 has a stop 2 on its axle head, the stop 2 being used to engage with the interface of the universal joint 3 of the balancing machine; the wheel axle 1 also has a plurality of threaded holes 4, the plurality of threaded holes 4 being located on the outer periphery of the stop 2, for fixing the wheel axle 1 to the universal joint 3 of the balancing machine by means of fasteners 5.

[0022] The large gear provided in the embodiments of this application, by setting a stop 2 and an outer peripheral threaded hole 4 on the shaft end of the axle 1, can achieve direct connection between the axle 1 and the universal joint 3 of the balancing machine. Based on this, on the one hand, there is no need to use an additional dynamic balancing joint, which directly saves the design, manufacturing or procurement costs of the dynamic balancing joint, greatly reduces the tooling cost investment, and solves the problem of high cost of traditional connection methods. On the other hand, the stop 2 can quickly achieve precise insertion and positioning of the axle 1 and the universal joint 3 of the balancing machine, and is fixed by fasteners 5 with the outer peripheral threaded hole 4. This not only simplifies the connection structure between the large gear and the universal joint 3 of the balancing machine, reduces the difficulty of dynamic balancing test operation, and reduces the cumbersome operation caused by complex joints, but also avoids the adverse effects on the test accuracy that may be caused by the structural problems of traditional dynamic balancing joints. It ensures that the axle 1 and the universal joint 3 of the balancing machine rotate synchronously and stably, providing a reliable guarantee for the accuracy of the balancing test data, thereby better ensuring the dynamic balancing test effect of the large gear, helping to improve the stability of subsequent equipment operation, reduce noise and extend the service life of the equipment. Among them, the axle head of wheel axle 1 is the end of wheel axle 1 used to connect with external components.

[0023] Among them, the stop 2 is a stepped protrusion structure machined on the shaft head. It has a positioning function and can be directly plugged into the interface of the universal joint 3 of the balancing machine, similar to a plug being inserted into a socket. This allows the wheel axle 1 and the universal joint to be aligned and ensure that their centers are aligned.

[0024] Around the stop 2, multiple threaded holes 4 with internal threads are evenly drilled. These threaded holes 4 all have a fixing function. After the stop 2 is inserted and positioned, bolts, screws and other fasteners 5 can be passed through these threaded holes 4 to lock the wheel axle 1 and the universal joint 3 of the balancing machine together to prevent loosening after connection.

[0025] Specifically, the dynamic balancing experiment of the large gear is carried out as follows: First, the interface of the universal joint 3 of the balancing machine is aligned with the stop 2 of the shaft head of the large gear axle 1. The insertion operation is completed by using the shape matching characteristics of the stop 2. At this time, the axle 1 and the universal joint have achieved preliminary alignment, effectively avoiding the problem of misalignment during connection. Next, fasteners 5 are installed in the threaded holes 4 on the outer circumference of the axle 1 and tightened, so that the axle 1 and the universal joint change from the preliminary docking state to the rigid fixed state, ensuring that the connection between the two is stable. After the connection process is completed, the balancing machine is started. When the balancing machine drives the universal joint to rotate, it will synchronously drive the large gear to rotate through the fixed axle 1. During this process, due to the accurate positioning and firm connection in the early stage, the overall rotational stability will not be affected by loose connection or misalignment, thus providing a reliable guarantee for the accuracy of the dynamic balancing test data.

[0026] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the centerline of stop 2 is collinear with the centerline of wheel axle 1.

[0027] In this embodiment, by setting the centerline of the stop 2 to be aligned with the centerline of the wheel axle 1, it is ensured that the stop 2 is centered on the axle head of the wheel axle 1, avoiding misalignment during the insertion of the wheel axle 1 and the universal joint 3 due to the eccentricity of the stop 2. Specifically, when the two are inserted, the collinear centerlines directly ensure that the center of the wheel axle 1 and the universal joint are aligned, eliminating the possibility of unilateral force or eccentric contact caused by the offset of the stop 2. This provides a coaxial reference for subsequent fixing with fasteners 5 through the threaded hole 4, further enhancing the overall coaxiality of the wheel axle 1 and the universal joint after connection. Furthermore, during the rotation of the universal joint, axle 1, and large gear driven by the balancing machine, the coaxial structure effectively avoids eccentric rotation caused by shaft misalignment, reduces additional centrifugal force during rotation, and ensures that the large gear always rotates stably around its own shaft. This not only avoids the risk of wear or loosening of the connecting structure caused by eccentric rotation, but also allows the dynamic balancing testing equipment to accurately capture the imbalance data of the large gear itself, eliminating the testing error caused by non-collinearity of the shaft. This provides a core structural guarantee for the accuracy of the dynamic balancing test results, and better supports subsequent optimization and adjustment of the large gear based on the test data, ensuring the stability, low noise, and long service life of the equipment during operation.

[0028] In some possible embodiments disclosed in this application, the mating clearance between the stop 2 and the universal joint 3 of the balancing machine is 0.01 mm to 0.05 mm.

[0029] In this embodiment, by controlling the mating gap between the stop 2 and the universal joint 3 of the balancing machine within the range of 0.01mm to 0.05mm, it can avoid problems such as excessive insertion resistance and assembly difficulties caused by too small a gap, and even damage to the joint or interface due to dimensional errors. This ensures that operators can easily complete the alignment and insertion operations of the two, improving assembly efficiency. At the same time, the extremely small gap can strictly limit the relative displacement of the wheel axle 1 and the universal joint in the radial direction, preventing radial wobbling caused by excessive gap. This ensures that the two always maintain a precise coaxial state after insertion, providing a stable reference for the subsequent fixing of the fastener 5.

[0030] Specifically, the fit clearance between the stop 2 and the universal joint 3 of the balancing machine can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, or 0.05mm, etc. It should be noted that the fit clearance between the stop 2 and the universal joint 3 of the balancing machine can also be other values ​​besides those mentioned above, as long as the fit clearance is within the range of 0.01mm to 0.05mm. During the rotation of the large gear driven by the balancing machine, this clearance range can effectively eliminate additional vibration or centrifugal force caused by radial movement, ensuring that the wheel axle 1 and the universal joint rotate synchronously and smoothly, avoiding rotational eccentricity caused by clearance issues. This allows the dynamic balancing testing equipment to accurately capture the imbalance of the large gear itself, eliminating test data deviations caused by excessive clearance, providing a key guarantee for the accuracy of dynamic balancing test results. It also reduces wear on the stop 2 and the universal joint 3 of the balancing machine caused by improper clearance, extending the service life of components and ensuring the stability of subsequent equipment operation.

[0031] In some possible embodiments disclosed in this application, the axial length of the stop 2 is 2 mm to 3 mm.

[0032] In this embodiment, by setting the axial length of the stop 2 within the range of 2mm to 3mm, it can avoid the problem of insufficient overlap between the wheel axle 1 and the universal joint 3 of the balancing machine due to the axial length being too short, which would lead to weak axial support after connection; it can also avoid the inconvenience of assembly caused by the axial length being too long, such as reducing the difficulty of guiding during insertion, reducing the risk of alignment deviation caused by the length being too long, and avoiding excessive occupation of the space at the axle head of the wheel axle 1, leaving enough space for the reasonable layout of the threaded hole 4 on the outer periphery, and ensuring the ease of operation and the reliability of fixing when installing the fastener 5.

[0033] Specifically, the axial length of the stop 2 can be 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm, etc. It should be noted that the axial length of the stop 2 can also be other values ​​besides those mentioned above, as long as it is within the range of 2mm to 3mm. During the rotation of the large gear driven by the balancing machine, the stop 2 within this length range can continuously provide stable axial positioning and support. Combined with precise clearance control and collinear design, this further ensures the smooth synchronous rotation of the wheel axle 1 and the universal joint, reducing vibration or wear caused by unreasonable axial structure, laying the foundation for the accuracy of dynamic balance test data, while also considering assembly efficiency and connection strength, thus improving the practicality of the overall technical solution.

[0034] In some possible embodiments disclosed in this application, the end of the stop 2 that is used to be inserted into the interface of the balancing machine universal joint 3 is provided with a conical surface. The conical surface can be adapted to the corresponding mating surface of the interface of the balancing machine universal joint 3 to guide the stop 2 to be inserted into the interface of the balancing machine universal joint 3.

[0035] In this embodiment, a conical surface is provided at one end of the stop 2 for insertion into the interface of the universal joint 3 of the balancing machine, and the conical surface is adapted to the corresponding mating surface of the universal joint interface. This provides guidance for the insertion of the stop 2 into the interface of the universal joint 3 of the balancing machine. Even if there is a slight positional deviation when the operator manually connects the parts, the inclined surface of the conical surface can gradually correct the stop 2 to the correct insertion path through the interaction force when in contact. This greatly reduces the difficulty of the alignment operation, avoids repeated adjustments due to port misalignment, and significantly improves assembly efficiency.

[0036] The conical surface refers to the inclined surface machined at the front end of the stop 2, which is the end of the stop 2 used to insert into the interface of the universal joint 3 of the balancing machine. It is not a straight port, but like the side of a cone, it forms an inclined transition at a certain angle from the end of the bayonet to the outside or inside. Furthermore, the inclination angle and surface dimensions of this conical surface are perfectly matched with the corresponding mating surface inside the interface of the universal joint 3 of the balancing machine, which is equivalent to the guide end of the plug and the entrance end of the socket being pre-fitted in shape.

[0037] In some possible embodiments disclosed in this application, a rounded corner is provided at the intersection of the end face of the axle head 1 and the outer peripheral surface of the stop 2, and the radius of the rounded corner is 1mm to 2mm.

[0038] In this embodiment, by setting a rounded corner with a radius of 1mm to 2mm at the intersection of the end face of the wheel axle 1 and the outer peripheral surface of the stop 2, it can not only avoid the structural weakness caused by stress concentration at the right angle, but also reduce the frictional resistance with the inner wall of the interface when the stop 2 is inserted into the universal joint 3 interface of the balancing machine through the arc transition, avoid the right angle edge from getting stuck or scratching the interface mating surface, help improve the smoothness of insertion, and further ensure the assembly efficiency and the integrity of the connection structure.

[0039] The end face of the axle head of wheel axle 1 refers to the end plane of wheel axle 1 used to connect to external components.

[0040] Among them, the outer peripheral surface of the stop 2 refers to the cylindrical surface on the outer side of the protruding structure of the stop 2.

[0041] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 2 As shown, multiple threaded holes 4 are evenly distributed circumferentially along the outer periphery of the stop 2, and the number of threaded holes 4 is the same as the number of screw holes on the universal joint 3 connecting plate of the balancing machine.

[0042] In this embodiment, by setting multiple threaded holes 4 evenly distributed along the outer circumference of the stop 2, and making their number the same as the number of screw holes on the connecting disc of the universal joint 3 of the balancing machine, the connection firmness and rotational stability can be guaranteed, providing a reliable structural basis for dynamic balancing testing. Specifically, the multiple threaded holes 4 evenly distributed around the circumference allow the force between the wheel axle 1 and the universal joint connecting plate to be evenly transmitted along the circumferential direction when the fastener 5 is locked. This avoids connection deformation or loosening caused by excessive local stress. Especially in high-speed rotating dynamic balancing testing scenarios, it can effectively counteract the uneven stress caused by centrifugal force and prevent vibration caused by force imbalance. The number of threaded holes 4 is consistent with the number of screw holes on the universal joint connecting plate, ensuring that each screw hole has a corresponding threaded hole 4. This avoids some holes being idle or experiencing concentrated stress due to mismatched hole positions, and allows for quick installation and positioning of the fastener 5 through one-to-one hole alignment, reducing the adjustment time for hole alignment during assembly and improving operational efficiency. In addition, the combination of even force and precise matching further ensures the coaxiality of the wheel axle 1 and the universal joint after connection, avoiding eccentric rotation caused by connection deviation, thereby eliminating the adverse effects on the accuracy of dynamic balancing testing, ensuring accurate test data, and providing a reliable basis for subsequent balance correction of the large gear.

[0043] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 3 As shown, the center distance of the multiple threaded holes 4 is matched with the center distance of the screw holes on the universal joint 3 connecting plate of the balancing machine, so that the fastener 5 can be sequentially inserted into the screw holes on the universal joint 3 connecting plate of the balancing machine and the threaded holes 4 on the axle head of the wheel axle 1 to fix the wheel axle 1 and the universal joint 3 of the balancing machine.

[0044] In this embodiment, by setting the center distance of multiple threaded holes 4 to match the center distance of the screw holes of the universal joint 3 connecting disc of the balancing machine, it can be ensured that the fasteners 5 can be accurately inserted and reliably fixed, while ensuring the structural stability and detection accuracy after connection. Specifically, when the center distance of multiple threaded holes 4 matches the center distance of the screw holes on the universal joint 3 connecting plate of the balancing machine, the threaded holes 4 on the axle 1 and the screw holes on the universal joint connecting plate can correspond perfectly one-to-one. This eliminates the problem of fasteners 5 being unable to be inserted or tilting after insertion due to dimensional deviations, directly removing dimensional compatibility obstacles during assembly and significantly improving assembly efficiency. Furthermore, the fasteners 5 can smoothly and vertically pass through the holes of the two components and lock in place, ensuring that the force between the axle 1 and the universal joint connecting plate is evenly distributed on each fastener 5. This avoids uneven local force due to hole misalignment and prevents fasteners 5 from loosening or components from deforming under long-term rotation or vibration. In addition, precise center distance matching further enhances the coaxiality of the axle 1 and the universal joint, ensuring that they always maintain a synchronous and stable state during rotation. This avoids interference from eccentric rotation caused by connection deviations on the accuracy of dynamic balancing tests, providing crucial assurance for the accuracy of test data and thus better guaranteeing the dynamic balancing test effect of the large gear, supporting the stable operation of subsequent equipment.

[0045] In some possible embodiments disclosed in this application, the diameter of the threaded hole 4 is adapted to the diameter of the screw hole on the universal joint 3 connecting plate of the balancing machine, and the depth of the threaded hole 4 is 1.2 to 1.5 times the diameter of the threaded hole 4.

[0046] In this embodiment, by setting the depth of the threaded hole 4 to 1.2 to 1.5 times the diameter of the threaded hole 4, the effective engagement length requirement of the fastener 5 can be met, ensuring sufficient locking force and preventing loosening under long-term rotation or vibration. At the same time, it can avoid excessive removal of the axle head material due to the threaded hole 4 being too deep, preventing a decrease in the structural strength of the axle head. It can also avoid the problem of the end of the fastener 5 touching the internal structure of the axle 1, causing additional wear or stress concentration, due to the fastener 5 being too long.

[0047] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 3 As shown, the large gear also includes a coupling 6, which is coaxially sleeved on the axle 1 and used to connect with external transmission components to transmit torque.

[0048] In this embodiment, a stable torque transmission bridge is built for the large gear by coaxially mounting a coupling 6 on the axle 1, while ensuring transmission accuracy and equipment operation stability. Specifically, coupling 6, as a transmission connection component, can adapt to the connection requirements of the large gear shaft 1 and external transmission components, such as motor shafts and other transmission shafts. This avoids problems such as size mismatch and different shaft installations that may occur due to direct connection between the two, flexibly realizing the effective transmission of torque and ensuring that the large gear can receive or output power as needed. The coaxial sleeve ensures that the center of coupling 6 and shaft 1 are completely aligned, avoiding additional centrifugal force or vibration caused by eccentricity during transmission, reducing wear on shaft 1 and external components, and extending the service life of the overall transmission system. In addition, coupling 6 itself has a certain buffering and vibration reduction capacity, which can absorb some of the impact or vibration generated by the operation of external transmission components, preventing these interferences from being directly transmitted to the large gear. This protects the structural stability of the large gear and reduces the impact of vibration on the overall operating accuracy of the equipment. Especially in scenarios requiring long-term, high-frequency operation, it can significantly improve the smoothness of equipment operation, reduce noise, and provide reliable transmission guarantee for subsequent large gear-related processes, such as the actual application after dynamic balancing testing.

[0049] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A large gear, characterized in that, The device includes a wheel axle; the wheel axle has a stop on its axle head, which is used to engage with the interface of the universal joint of the balancing machine; the wheel axle also has multiple threaded holes on its axle head, which are located on the outer periphery of the stop, and are used to fix the wheel axle to the universal joint of the balancing machine by fasteners.

2. The large gear according to claim 1, characterized in that, The centerline of the stop is collinear with the centerline of the wheel axle.

3. The large gear according to claim 1, characterized in that, The clearance between the stop and the universal joint interface of the balancing machine is 0.01mm to 0.05mm.

4. The large gear according to claim 1, characterized in that, The axial length of the stop is 2mm to 3mm.

5. The large gear according to claim 1, characterized in that, The stop is provided with a tapered surface at one end for insertion into the universal joint interface of the balancing machine. The tapered surface can be adapted to the corresponding mating surface of the universal joint interface of the balancing machine to guide the stop into the universal joint interface of the balancing machine.

6. The large gear according to claim 1, characterized in that, The end face of the wheel axle head and the outer peripheral surface of the stop are provided with a rounded corner, the radius of which is 1mm to 2mm.

7. The large gear according to claim 1, characterized in that, The multiple threaded holes are evenly distributed circumferentially along the outer periphery of the stop, and the number of the threaded holes is the same as the number of screw holes on the universal joint connecting plate of the balancing machine.

8. The large gear according to claim 1, characterized in that, The center distance of the plurality of threaded holes is adapted to the center distance of the screw holes on the universal joint connecting plate of the balancing machine, so that the fastener can be sequentially passed through the screw holes on the universal joint connecting plate of the balancing machine and the threaded holes on the axle head to fix the axle and the universal joint of the balancing machine.

9. The large gear according to claim 1, characterized in that, The diameter of the threaded hole is adapted to the diameter of the screw hole on the universal joint connecting plate of the balancing machine, and the depth of the threaded hole is 1.2 to 1.5 times the diameter of the threaded hole.

10. The large gear according to claim 1, characterized in that, It also includes a coupling, which is coaxially sleeved on the axle and used to connect with external transmission components to transmit torque.

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