A floating axial chamfer control system for a VVT sprocket

Abstract

The present application relates to the technical field of sprocket chamfering, and discloses a floating axial chamfering control system for a VVT sprocket, which comprises a main shaft, the bottom of the main shaft is provided with a chamfering piece, the bottom of the output shaft of the main shaft is fixedly connected with a connecting cylinder, the bottom of the connecting cylinder is provided with a floating connecting piece, the floating connecting piece and the chamfering piece are mutually installed and provide rotating force for the chamfering piece, a mechanical holder is installed between the outer surface of the fixed end of the main shaft and the chamfering piece, the mechanical holder is used for adjusting the axial angle of the chamfering piece, the chamfering piece is composed of a grinding wheel and a connecting rod, and the two are fixedly connected with each other, the control system adopts a floating axial chamfering design, cooperates with a mechanical holder and a universal ball connecting structure, effectively solves the problem that the traditional equipment is difficult to chamfer in the gap and groove of the VVT sprocket, and the angle adjusting mechanism of the mechanical holder can drive the chamfering piece to realize multi-angle adjustment, and the universal ball connection at the bottom of the connecting cylinder enables the chamfering piece to accurately fit the complex profile.

Description

Technical Field

[0001] This invention relates to the field of sprocket chamfering technology, specifically a floating axial chamfering control system for VVT sprockets. Background Technology

[0002] VVT sprocket, short for Variable Valve Timing Sprocket, is a core component of the valve train in a car engine. It works in conjunction with a chain or belt to precisely control the opening timing and duration of the engine valves, thus achieving variable valve timing. This technology can significantly improve engine fuel economy, optimize power output, and effectively reduce exhaust emissions, making it crucial for improving the overall performance and environmental protection of automobiles.

[0003] In practical applications, to meet the requirements of efficient and stable engine operation, VVT sprockets need to be chamfered. On the one hand, chamfering can optimize the assembly process, making it easier to align and insert the sprocket with the shaft or other components, reducing assembly resistance, and improving installation efficiency and accuracy. On the other hand, by eliminating the sharp angles of the sprocket edge, stress concentration caused by tension and torque during operation can be effectively dispersed, avoiding fatigue cracks and fracture risks, and extending the service life of the components.

[0004] However, existing VVT sprocket chamfering devices still have some problems: First, the VVT ​​sprocket has a complex structure, and key parts such as the tooth root and shaft hole edge need to be finely chamfered. However, existing equipment mostly adopts a rigid fixed spindle and tool structure, which can only achieve flat or shallow chamfering. When it is necessary to chamfer in hidden areas such as the gaps and cavities of the sprocket, traditional equipment lacks the ability to dynamically adjust the spindle angle, making it difficult for the tool to accurately fit the complex contour, resulting in blind spots or out-of-tolerance chamfering dimensions. Some companies have tried to make up for this deficiency by adjusting the table angle or using segmented clamping, but frequent clamping and positioning operations not only prolong the auxiliary processing time, but also easily introduce cumulative errors, making it difficult to meet the stringent requirements of the engine valve train in terms of processing accuracy.

[0005] Secondly, existing chamfering equipment relies heavily on rigid connectors to transmit power when adjusting the spindle angle. Once the spindle deflects, the rigid connector will bear additional torque and bending moment, which can easily lead to problems such as spindle bearing wear, transmission component and tool breakage. Especially under high-frequency and large-angle angle adjustment conditions, the coaxiality and stability of the spindle will drop sharply, and may even lead to the scrapping of the entire spindle. The replacement and maintenance costs of high-precision spindles are high, which seriously restricts the processing efficiency and economic benefits of enterprises.

[0006] Therefore, this invention proposes a floating axial chamfer control system for VVT sprockets. Summary of the Invention

[0007] The purpose of this invention is to provide a floating axial chamfer control system for VVT sprockets to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a floating axial chamfering control system for VVT sprockets, comprising a main shaft, a chamfering component mounted on the bottom of the main shaft, a connecting cylinder fixedly connected to the bottom of the output shaft of the main shaft, a floating connector mounted on the bottom of the connecting cylinder, the floating connector and the chamfering component being installed together and providing rotational force thereto, and a mechanical gimbal mounted between the outer surface of the fixed end of the main shaft and the chamfering component, the mechanical gimbal being used to adjust the axial angle of the chamfering component.

[0009] Preferably, the chamfering component consists of a grinding wheel and a connecting rod, which are fixedly connected to each other. The end of the connecting rod near the main shaft is a spherical structure, and the bottom of the connecting cylinder is provided with a hemispherical groove that matches the spherical structure. The two form a universal ball connection, and the connecting rod is rotatably connected to the bottom of the mechanical gimbal.

[0010] Preferably, the floating connector includes:

[0011] The base plate is fixedly connected to the surface of the connecting rod;

[0012] Several flexible strips are arranged in a circular pattern and fixedly connected to the surface of the base plate;

[0013] The top plate is fixedly connected to the surface of the connecting cylinder and is also fixedly connected to several flexible belts.

[0014] Preferably, the flexible strip is made of an elastic material.

[0015] Preferably, a lubrication limiting member is installed inside the connecting cylinder, the lubrication limiting member comprising:

[0016] An oil cavity, wherein the oil cavity is located inside the connecting cylinder;

[0017] An oil tank is fixedly connected to the outer surface of the connecting cylinder, and the oil tank is filled with lubricating oil.

[0018] An oil pipe is fixedly connected between the oil cavity and the oil tank.

[0019] Preferably, the lubrication limiting member further includes:

[0020] Several placement slots are arranged in a circle around the universal structure at the bottom of the oil cavity;

[0021] A plurality of lubricating strips are installed inside corresponding placement slots, and the lubricating strips are in contact with the spherical structure.

[0022] Preferably, the lubricating strip is made of fiber material.

[0023] Preferably, a lubricating oil feeding device is installed inside the oil tank and oil cavity. The lubricating oil feeding device controls the supply of lubricating oil by detecting the thickness of the lubricating oil film on the surface of the lubricating strip.

[0024] Preferably, a moving unit and a clamp are respectively installed on the outside of the spindle.

[0025] Preferably, the spindle, mechanical gimbal, moving unit, clamp, and lubricating oil feeding device are all electrically connected to an external controller.

[0026] Preferably, the mechanical gimbal includes: an angle adjustment mechanism for driving the chamfering component to rotate about a horizontal axis and / or a vertical axis to adjust the axial angle of the chamfering component;

[0027] The servo drive unit is electrically connected to an external controller and is used to receive angle adjustment commands and drive the angle adjustment mechanism to move.

[0028] Preferably, the flexible strip is made of polyurethane elastomer, and both ends of the flexible strip are fixedly connected to the base plate and the top plate by a vulcanization process or mechanical fasteners.

[0029] Preferably, the lubricating oil feeding device includes: an external solenoid valve, installed at the connection between the oil tank and the oil pipe, for controlling the flow of lubricating oil;

[0030] A capacitive contact sensor is installed inside the oil chamber and is set in a non-contact manner with the surface of the lubricating strip to detect the thickness of the lubricating oil film on the surface of the lubricating strip.

[0031] The external controller controls the opening and closing of the external solenoid valve based on the detection signal from the capacitive contact sensor, so as to maintain the thickness of the lubricating oil film on the surface of the lubricating strip within a preset range.

[0032] Preferably, the moving unit is used to drive the spindle to move along the X-axis, Y-axis and Z-axis directions to adjust the position of the chamfering part;

[0033] The fixture is used to fix the VVT ​​sprocket workpiece and works in coordination with the moving unit to achieve axial chamfering of the workpiece by the chamfering part.

[0034] Preferably, the lubricating strip is made of degreased cotton.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. This control system adopts a floating axial chamfering design. Through the coordinated use of the mechanical gimbal and the universal ball connection structure, it effectively solves the problem that traditional equipment is difficult to chamfer deep into the gaps and cavities of VVT sprockets. The angle adjustment mechanism of the mechanical gimbal can drive the chamfering part to achieve multi-angle adjustment. With the universal ball connection at the bottom of the connecting cylinder, the chamfering part can accurately fit the complex contour.

[0037] For example, when processing hidden areas such as the root of sprocket teeth, the chamfering component can flexibly adjust the angle to avoid blind spots in the machining process. At the same time, the flexible belt in the floating connector has high elasticity. Even under large-angle tilt conditions, it can still compensate for the angle difference through stretching and torsional deformation, continuously and stably transmit power, ensure effective contact between the tool and the workpiece, and achieve fine chamfering that traditional rigid structures cannot accomplish.

[0038] 2. The system adopts a modular structure design, which significantly reduces maintenance costs and operational difficulty. Key components such as the flexible belt of the floating connector and the lubricating strip of the lubrication limiting component are all independent modules. The two ends of the flexible belt are connected to the bottom plate and top plate through vulcanization process or mechanical fasteners. If wear or breakage occurs, it can be quickly disassembled and replaced without disassembling the entire equipment. The lubricating strip adopts a detachable structure. When the degreased cotton fiber reduces its oil storage capacity due to long-term friction wear, the operator can directly take it out from the placement groove at the bottom of the oil chamber and replace it, avoiding component damage caused by lubrication failure. This modular design not only shortens downtime for maintenance but also significantly reduces maintenance costs, making it particularly suitable for automotive parts production scenarios with high requirements for processing continuity.

[0039] 3. By integrating innovative modules into the traditional spindle structure, the system achieves a low-cost transition for technological upgrades. Enterprises do not need to replace the core components of the original chamfering machine tool. They only need to integrate new modules such as mechanical gimbals, floating connectors, and lubrication limiters into the existing equipment to quickly complete the transformation. This design takes into account both technological advancement and equipment compatibility, significantly reducing the cost and implementation threshold of technological transformation for enterprises.

[0040] 4. This system significantly improves chamfering efficiency through multi-dimensional optimization. First, the coordinated control of the mechanical gimbal and the moving unit enables rapid positioning and angle adjustment of the chamfered parts, greatly reducing auxiliary processing time compared to traditional equipment that relies on manual labor or multiple clamping operations. Second, the flexible belt of the floating connector can quickly accumulate and release torque when the spindle rotates, driving the chamfered parts to rotate at high speed, avoiding power transmission delays caused by rigid connections. In addition, the closed-loop control of the lubricating oil feeding device ensures that the universal ball joint is always in optimal lubrication, reducing frictional resistance and ensuring the continuity of the chamfering process. Actual testing shows that when processing VVT sprockets with complex contours, this system's processing efficiency is higher than traditional equipment, effectively meeting the needs of large-scale automotive parts production.

[0041] 5. In traditional chamfering equipment, rigid connecting parts are prone to wear or even breakage of the spindle bearing due to concentrated torque and bending moment during spindle angle adjustment. However, the flexible belt used in this system can absorb the stress generated by angle changes, avoiding direct impact on the spindle. At the same time, the universal ball connection structure evenly distributes radial force through the cooperation of the spherical structure and the hemispherical groove, preventing excessive stress on the chamfering parts. In addition, the capacitive contact sensor in the lubrication limit component monitors the oil film thickness of the lubrication strip in real time. When the oil film is lower than the threshold, it automatically replenishes lubricating oil to ensure that the universal ball connection surface is always in a lubricated state, reducing friction and wear. Attached Figure Description

[0042] Figure 1 This is a frontal perspective three-dimensional schematic diagram of the main structure of the present invention;

[0043] Figure 2 This is a frontal perspective three-dimensional schematic diagram of the main structure of the present invention assembled with the chamfering machine tool;

[0044] Figure 3 This is a front view of the main structure of the present invention assembled with the chamfering machine tool;

[0045] Figure 4 This is a side perspective three-dimensional schematic diagram of the main structure of the present invention assembled with the chamfering machine tool;

[0046] Figure 5 This is a partial three-dimensional schematic diagram of the main structure of the present invention;

[0047] Figure 6 For the present invention Figure 5 Enlarged 3D structural diagram at point A;

[0048] Figure 7 For the present invention Figure 5 Enlarged 3D structural schematic diagram at point B;

[0049] Figure 8 This is a three-dimensional cross-sectional view of the main structure of the present invention;

[0050] Figure 9 For the present invention Figure 8 Enlarged 3D structural schematic at point C;

[0051] Figure 10 This is a three-dimensional schematic diagram of the mechanical gimbal, floating connector, and connecting cylinder of the present invention.

[0052] In the picture:

[0053] 11. Spindle; 12. Chamfering piece; 13. Moving unit; 14. Fixture.

[0054] 21. Mechanical gimbal; 22. Floating connector; 221. Base plate; 222. Flexible belt; 223. Top plate; 23. Connecting cylinder; 24. Lubrication limiting component; 241. Oil cavity; 242. Lubricating strip; 243. Oil pipe; 244. Oil tank. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0056] It should be noted that the spindle 11 only provides the function of rotating the chamfered part 12, the mechanical gimbal 21 only provides the function of changing the angle of the chamfered part 12, the lubricating oil feeding device only provides the function of feeding lubricating oil, and the moving unit 13 only provides the function of moving the spindle 11. The working principle and specific structure of the above structures are all existing technologies. Therefore, given the universality of the above structures, their specific principles will not be described in detail below.

[0057] Please see Figures 1 to 10 The present invention provides an embodiment:

[0058] A floating axial chamfering control system for VVT sprockets includes a main shaft 11, a chamfering member 12 mounted on the bottom of the main shaft 11, a connecting cylinder 23 fixedly connected to the bottom of the output shaft of the main shaft 11, a floating connector 22 mounted on the bottom of the connecting cylinder 23, the floating connector 22 and the chamfering member 12 being installed together and providing rotational power to each other, and a mechanical gimbal 21 being installed between the outer surface of the fixed end of the main shaft 11 and the chamfering member 12, the mechanical gimbal 21 being used to adjust the axial angle of the chamfering member 12.

[0059] It should be noted that the chamfering part 12 consists of a grinding wheel and a connecting rod, which are fixedly connected to each other. The end of the connecting rod near the main shaft 11 is a spherical structure, and the bottom of the connecting cylinder 23 is provided with a hemispherical groove that matches the spherical structure. The two form a universal ball joint, allowing the connecting rod to rotate around the horizontal and vertical axes within a range of ±30°, while restricting radial displacement. The connecting rod is rotatably connected to the bottom of the mechanical gimbal 21. The floating connecting part 22 includes: a base plate 221, which is fixedly connected to the surface of the connecting rod; several flexible belts 222, which are arranged circumferentially and fixedly connected to the surface of the base plate 221; and a top plate 223, which is fixedly connected to the surface of the connecting cylinder 23 and is fixedly connected to the several flexible belts 222. The connecting sleeve 222 is made of elastic material. A lubrication limiting component 24 is installed inside the connecting cylinder 23. The lubrication limiting component 24 includes: an oil cavity 241 located inside the connecting cylinder 23; an oil tank 244 fixedly connected to the outer surface of the connecting cylinder 23, containing lubricating oil; and an oil pipe 243 fixedly connecting the oil cavity 241 and the oil tank 244. The lubrication limiting component 24 also includes: several placement slots arranged circumferentially around the universal structure at the bottom of the oil cavity 241; and several lubricating strips 242 installed in corresponding placement slots, with each lubricating strip 242 in contact with the spherical structure. The lubricating strips 242 are made of fiber material. The oil tank 244 and oil chamber 241 are equipped with a lubricating oil feeding device. The lubricating oil feeding device controls the supply of lubricating oil by detecting the thickness of the lubricating oil film on the surface of the lubricating strip 242. A moving unit 13 and a clamp 14 are respectively installed on the outside of the spindle 11. The spindle 11, mechanical gimbal 21, moving unit 13, clamp 14, and lubricating oil feeding device are all electrically connected to an external controller. The mechanical gimbal 21 includes: an angle adjustment mechanism for driving the chamfering part 12 to rotate around the horizontal axis and / or vertical axis to adjust the axial angle of the chamfering part 12; and a servo drive unit electrically connected to the external controller for receiving angle adjustment commands and driving the angle adjustment mechanism to operate. The flexible belt 222 is made of polyurethane elastomer material, and The two ends of the flexible strip 222 are fixedly connected to the base plate 221 and the top plate 223 respectively by vulcanization process or mechanical fasteners. The lubricating oil feeding device includes: an external solenoid valve, installed at the connection between the oil tank 244 and the oil pipe 243, for controlling the flow of lubricating oil; a capacitive contact sensor, installed inside the oil cavity 241 and non-contact with the surface of the lubricating strip 242, for detecting the thickness of the lubricating oil film on the surface of the lubricating strip 242; wherein, the external controller controls the opening and closing of the external solenoid valve according to the detection signal of the capacitive contact sensor to maintain the thickness of the lubricating oil film on the surface of the lubricating strip 242 within a preset range; the moving unit 13 is used to drive the spindle 11 to move along the X-axis, Y-axis and Z-axis directions to adjust the position of the chamfering part 12;The clamp 14 is used to fix the VVT ​​sprocket workpiece and works in coordination with the moving unit 13 to achieve axial chamfering of the workpiece by the chamfering part 12. The lubricating strip 242 is specifically made of degreased cotton. The bottom of the mechanical gimbal 21 is provided with an external annular support seat, which is rotatably connected to the middle of the connecting rod and provides radial constraint through a high-precision bearing to ensure that the coaxiality error of the chamfering part 12 during rotation is ≤0.02mm.

[0060] It should be noted that the spindle 11, the moving unit 13 and other components are all integrated into the chamfering machine tool, and the machine tool provides stable power input and machining reference.

[0061] Specifically, the VVT ​​sprocket workpiece is first fixed on the fixture 14, and then the external controller starts the spindle 11 and the moving unit 13.

[0062] The moving unit 13 drives the spindle 11 to move along the X, Y, and Z axes, adjusting the chamfered part 12 to the workpiece to be processed position; at the same time, the spindle 11 starts to rotate, driving the connecting cylinder 23 to rotate synchronously.

[0063] The rotational power of the main shaft 11 is transmitted to the floating connector 22 via the connecting cylinder 23. Specifically, the top plate 223 at the bottom of the connecting cylinder 23 rotates with the connecting cylinder 23, driving the circumferentially distributed flexible belt 222. Since the flexible belt 222 is made of polyurethane elastomer, it has high elasticity and flexibility. When the top plate 223 rotates, the flexible belt 222 undergoes torsional deformation due to elastic deformation and accumulates torque. Then, the accumulated torque force drives the bottom plate 221 to rotate. The bottom plate 221 is fixed to the connecting rod of the chamfering part 12, thereby driving the chamfering part 12 to rotate at high speed and perform axial chamfering on the VVT ​​sprocket workpiece.

[0064] During this process, the mechanical gimbal 21 restricts the radial displacement of the chamfered part 12 through a stable support structure, ensuring its coaxiality and stability during rotation;

[0065] When the chamfering part 12 needs to penetrate deep into the workpiece gap or adapt to complex chamfering angles, the external controller sends a command to the servo drive unit of the mechanical gimbal 21 to drive the angle adjustment mechanism to move. The mechanical gimbal 21 drives the chamfering part 12 to rotate around the horizontal axis and / or vertical axis to adjust the axial angle. At this time, the spherical structure of the chamfering part 12 connecting rod rotates flexibly in the universal ball connection structure at the bottom of the connecting cylinder 23 to achieve multi-angle adjustment.

[0066] It should be noted that the elastic properties of the flexible belt 222 play a key role in this process: it can continuously transmit power within a certain angular deviation range. Even if the chamfered part 12 tilts, the flexible belt 222 can still compensate for the angular difference through stretching and torsional deformation, ensuring that the power is stably transmitted to the chamfered part 12 and maintaining continuous processing. At the same time, several flexible belts 222 are symmetrically distributed in a circular pattern, ensuring that regardless of whether the spindle 11 rotates forward or backward, the torque generated by the elastic deformation can be synchronously transmitted to the base plate 221 through the symmetrical flexible belts 222, avoiding eccentric loading caused by unidirectional force.

[0067] In addition, the lubricating oil in the oil tank 244 flows into the oil cavity 241 of the connecting cylinder 23 through the oil pipe 243 and wets the lubricating strip 242 installed in the groove at the bottom of the oil cavity 241. The micron-level pores between the degreased cotton fibers form a capillary network, which draws in and stores the lubricating oil through surface tension. When the spherical structure squeezes the lubricating strip 242, the pore volume is compressed, forcing the lubricating oil to seep out along the fiber gaps and form a uniform oil film on the friction surface.

[0068] It should be noted that the lubricating strip 242 is a detachable structure, and worn lubricating strip 242 can be replaced periodically.

[0069] During the above process, the lubricating oil feeding device monitors the thickness of the lubricating oil film on the surface of the lubricating strip 242 in real time through a capacitive contact sensor. When the sensor detects that the oil film thickness is lower than a preset threshold, it sends a signal to the external controller, which then opens the external solenoid valve at the connection between the oil tank 244 and the oil pipe 243 to replenish the lubricating oil.

[0070] When the oil film thickness reaches the upper limit threshold, the solenoid valve closes to prevent excessive consumption of lubricating oil.

[0071] Through closed-loop control, the system can dynamically maintain the optimal lubrication state of the lubricating strip 242, effectively reducing the friction coefficient of the spherical structure, reducing wear, and using the viscosity of the lubricating oil to provide a buffer for the universal ball connection, limiting the excessive floating of the chamfering part 12, preventing it from falling off or loosening due to uneven force, and ensuring the stability and reliability of the processing. Compared with the traditional rigid connection chamfering device, the present invention solves the problems of power interruption and connection stability when chamfering complex angles through the coordinated design of the elastic force transmission of the flexible belt 222 and the floating connection of the universal ball. This not only improves the processing accuracy but also extends the service life of the chamfering part 12.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A floating axial chamfering control system for a VVT sprocket, comprising a main shaft (11) with a chamfering member (12) mounted on the bottom of the main shaft (11), characterized in that: A connecting cylinder (23) is fixedly connected to the bottom of the output shaft of the main shaft (11). A floating connector (22) is installed at the bottom of the connecting cylinder (23). The floating connector (22) is installed with the chamfering piece (12) and provides rotational force to it. A mechanical gimbal (21) is installed between the outer surface of the fixed end of the main shaft (11) and the chamfering piece (12). The mechanical gimbal (21) is used to adjust the axial angle of the chamfering piece (12). The chamfering part (12) consists of a grinding wheel and a connecting rod, which are fixedly connected to each other. The end of the connecting rod near the main shaft (11) is a spherical structure. The bottom of the connecting cylinder (23) is provided with a hemispherical groove that is adapted to the spherical structure. The two form a universal ball connection. The connecting rod is rotatably connected to the bottom of the mechanical gimbal (21). The floating connector (22) includes: The base plate (221) is fixedly connected to the surface of the connecting rod; A plurality of flexible strips (222) are arranged in a circular pattern and fixedly connected to the surface of the base plate (221); Top plate (223), which is fixedly connected to the surface of connecting cylinder (23) and is fixedly connected to several flexible strips (222); the flexible strips (222) are made of polyurethane elastomer material, and the two ends of the flexible strips (222) are fixedly connected to the bottom plate (221) and the top plate (223) respectively by vulcanization process or mechanical fasteners; The elastic properties of the flexible belt (222) play the following role: it can continuously transmit power within a certain angular deviation range. Even if the chamfered part (12) tilts, the flexible belt (222) can still compensate for the angle difference through stretching and twisting deformation, ensuring that the power is stably transmitted to the chamfered part (12) and maintaining continuous processing. At the same time, several flexible belts (222) are symmetrically distributed in a circle, ensuring that no matter whether the spindle (11) rotates forward or backward, the torque generated by the elastic deformation can be synchronously transmitted to the base plate (221) through the symmetrical flexible belts (222), avoiding the off-center load caused by unidirectional force. The connecting cylinder (23) is equipped with a lubrication limiting member (24), which includes: Oil cavity (241), the oil cavity (241) is opened inside the connecting cylinder (23); Oil tank (244), the oil tank (244) is fixedly connected to the outer surface of the connecting cylinder (23), and the oil tank (244) is filled with lubricating oil; Oil pipe (243), which is fixedly connected between oil cavity (241) and oil tank (244); The lubrication limiting member (24) also includes: Several placement slots are arranged in a circle around the universal structure at the bottom of the oil cavity (241); A plurality of lubricating strips (242) are installed inside corresponding placement slots, and the lubricating strips (242) are in contact with the spherical structure.

2. The floating axial chamfer control system for VVT sprockets according to claim 1, characterized in that: The flexible strip (222) is made of elastic material.

3. A floating axial chamfer control system for a VVT sprocket according to claim 2, characterized in that: The lubricating strip (242) is made of fiber material.

4. A floating axial chamfer control system for a VVT sprocket according to claim 3, characterized in that: The oil tank (244) and oil cavity (241) are equipped with a lubricating oil feeding device, which controls the supply of lubricating oil by detecting the thickness of the lubricating oil film on the surface of the lubricating strip (242).

5. A floating axial chamfer control system for a VVT sprocket according to claim 1, characterized in that: The main shaft (11) is equipped with a moving unit (13) and a clamp (14) on its exterior.

6. A floating axial chamfer control system for a VVT sprocket according to claim 5, characterized in that: The spindle (11), mechanical gimbal (21), moving unit (13), clamp (14), and lubricating oil feeding device are all electrically connected to an external controller.

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