High-precision machining equipment for main pin hole of automobile steering knuckle

Abstract

The invention relates to the technical field of clamping and fixing tools, and discloses automobile steering knuckle main pin hole high-precision machining equipment which comprises a combined clamping mechanism and an elastic pre-tightening type tightening mechanism. According to the high-precision machining equipment for the main pin hole of the automobile steering knuckle, the automobile steering knuckle can be axially clamped, so that the steering knuckle is always subjected to axial clamping acting force after being clamped, in addition, after being clamped, the high-precision machining equipment can provide a buffering effect with adjustable elastic strength, so that required pre-tightening force is generated on a fixed thread structure, and the machining precision of the steering knuckle is improved. And therefore, the anti-pressure capability of equipment on mechanical vibration is improved, and the stable workpiece clamping effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping and fixing tools, and particularly to a high-precision machining equipment for the kingpin hole of an automotive steering knuckle. Background Art

[0002] The vehicle steering knuckle is an important component of a vehicle. When machining the vehicle steering knuckle, pin holes need to be machined, so corresponding machining equipment is required.

[0003] For example, Chinese Patent with the publication number "CN119733866A" discloses "a high-precision machining equipment for the kingpin hole of an automotive steering knuckle". Its main structure includes a workbench and a steering knuckle body. A vertical drilling machine is arranged on the workbench, and a cutter head is arranged on the vertical drilling machine. The cutter head is arranged above the steering knuckle body. The steering knuckle body includes a kingpin hole located in the middle position, a first arm body and a second arm body. It also includes a support seat arranged on the lower end surface of the steering knuckle body for placing the steering knuckle body, and a first positioning device. The first positioning device includes a turntable arranged on the workbench. A first cylinder and a fixing plate are arranged on the turntable. The upper end of the first cylinder is hinged with a pressing rod. A connecting plate is arranged in the middle of the pressing rod and is connected to the fixing plate through the connecting plate. The end of the pressing rod is arranged above the first arm body. This high-precision machining equipment for the kingpin hole of an automotive steering knuckle can stably fix the steering knuckle body on the workbench by setting a first positioning device, a second positioning device and a third positioning device.

[0004] However, since the surface of the pin shaft connection part of the automotive steering knuckle is not a planar structure but a corresponding curved surface structure, when the above high-precision machining equipment for the kingpin hole of an automotive steering knuckle fixes the corresponding part, it uses multiple non-axial joints and multiple non-axial connecting rods to fix the steering knuckle. Due to the large number of joints and connecting rods, during the fixing process, when the drilling equipment contacts the steering knuckle, vibration will occur. This vibration is accompanied by multiple joints and multiple connecting rods, and mechanical loosening is likely to occur, resulting in accuracy deviation of the steering knuckle during the machining process. Therefore, there is a phenomenon of poor machining accuracy due to unstable workpiece clamping. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a high-precision machining equipment for the kingpin hole of an automotive steering knuckle, which can achieve an axial clamping effect on the automotive steering knuckle, so that after the steering knuckle is clamped, it is always subjected to an axial clamping force. In addition, after clamping, the device can provide a buffer effect with adjustable elastic strength, thereby generating the required pre-tightening force on the fixed threaded structure to improve the anti-vibration ability of the equipment against mechanical vibration, and further achieving a stable workpiece clamping effect, solving the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solution: A high-precision machining equipment for the kingpin hole of an automobile steering knuckle, including a combined clamping mechanism, which internally is provided with a lower clamping disk and an upper clamping disk capable of clamping the steering knuckle at both ends of the center hole, and an axial valve rod that can change the clamping distance between the lower clamping disk and the upper clamping disk after receiving an axial force; and an elastic pre-tightening tightening mechanism, which internally is provided with an axial hollow housing fixedly installed at the bottom of the lower clamping disk and in a hollow state inside, an axial threaded rod integrally provided at the bottom end of the axial hollow housing and externally sleeved with a threaded sleeve, an inner movable plate placed inside the axial hollow housing and capable of driving the axial valve rod to move axially, an inner movable ring located directly above the inner movable plate and capable of moving axially with the threaded sleeve, and a spiral spring that generates an elastic force on the inner movable ring and the inner movable plate.

[0007] Preferably, the combined clamping mechanism further includes a force-applying rod integrally provided at the center of the top end of the axial valve rod for applying a pulling force. The bottom of the lower clamping disk is provided with a first fixed plate of an integrated structure therewith. A first shaft body movable hole with an open end is provided at the center of the lower clamping disk and the upper clamping disk. The lower clamping disk and the upper clamping disk are provided with plum blossom-shaped limiting holes on the circumferential side of the first shaft body movable hole. The upper end surface of the upper clamping disk is provided with plum blossom-shaped limiting grooves that are misaligned with the plum blossom-shaped limiting holes on the outer circumferential surface of the first shaft body movable hole. The axial valve rod is provided with a plum blossom-shaped limiting protrusion of an integrated structure on the outer circumferential surface near its top end. The center of the bottom end of the axial valve rod is provided with an inwardly concave shaft body fixing groove.

[0008] Preferably, the structural shape formed by the axial valve rod and the plum blossom-shaped limiting protrusion, the structural shape formed by the first shaft body movable hole and the plum blossom-shaped limiting holes, and the structural shape formed by the first shaft body movable hole and the plum blossom-shaped limiting grooves are the same, all being plum blossom-shaped structures.

[0009] Preferably, the cross-sectional structural dimensions formed by the axial valve rod and the plum blossom-shaped limiting protrusion, the cross-sectional structural dimensions formed by the first shaft body movable hole and the plum blossom-shaped limiting holes, and the cross-sectional structural dimensions formed by the first shaft body movable hole and the plum blossom-shaped limiting grooves are mutually matched.

[0010] Preferably, the elastic pre-tightening tightening mechanism further includes an outer sleeve ring. A second fixing plate, which is integrally structured with the axial hollow housing and fixedly installed at the bottom end of the first fixing plate, is provided at the top end of the axial hollow housing. A lower convex ring structure, which is integrally structured with the axial hollow housing, is provided at the bottom end of the axial hollow housing. An axial threaded rod, which is integrally structured with the lower convex ring structure, is provided at the bottom end of the lower convex ring structure. A third fixing plate, which is integrally structured with the axial threaded rod, is provided at the bottom end of the axial threaded rod. An axial internal threaded hole, which is installed outside the rod body of the axial threaded rod through a first threaded structure, is provided at the center of the threaded sleeve. The sleeve hole of the outer sleeve ring is installed outside the barrel of the threaded sleeve through a bearing. An axial component moving cavity is provided inside the axial hollow housing. A third shaft moving hole, which communicates the top end of the axial component moving cavity and the bottom end of the first shaft moving hole, is provided at the center of the top end of the axial hollow housing. Two symmetrical limiting sliding grooves are provided at the circumferential wall thickness of the axial hollow housing. An inner moving plate, which can move axially along the axial component moving cavity, is placed inside the axial hollow housing at the position of the axial component moving cavity. An inner moving ring, which can move axially along the axial component moving cavity, is placed inside the axial hollow housing at the position of the axial component moving cavity. A spiral spring is placed between the inner moving plate and the inner moving ring. A second shaft moving hole with open ends at both ends is provided at the center of the inner moving ring. An axial pull rod, which penetrates through the second shaft moving hole and the third shaft moving hole, is fixedly installed at the upper end of the inner moving plate. The top end of the axial pull rod is fixedly installed inside the shaft fixing groove. Two L-shaped connecting rods, which respectively penetrate through the limiting sliding grooves, are fixedly installed on the corresponding side surfaces of the inner moving ring. The bottom ends of the L-shaped connecting rods are fixedly installed at the upper end of the outer sleeve ring.

[0011] Preferably, the first threaded structure includes an internal threaded structure provided in the axial internal threaded hole and an external threaded structure provided on the rod body of the axial threaded rod, and the internal threaded structure matches the external threaded structure.

[0012] Preferably, the structural radius of the third shaft moving hole is larger than the structural radius of the axial valve rod, and the width of the limiting sliding groove matches the structural diameter of the horizontal rod of the L-shaped connecting rod.

[0013] Preferably, a threaded position adjusting mechanism is further included. A moving block, which can drive the third fixing plate to move, a horizontal limiting rod, which is inserted into the moving block and can limit the moving block to move horizontally, and a horizontal external threaded rod, which is installed at the center of the moving block and can make the moving block move when rotating, are provided inside the threaded position adjusting mechanism.

[0014] Preferably, the threaded position adjusting mechanism further includes a hand crank and two fixed bases. The two fixed bases are symmetrically arranged, and a horizontal limiting rod is fixedly installed on the symmetrical plane of the fixed base. An axially-mounted hole with both ends open is provided in the fixed base. The rod bodies at both ends of the horizontal external threaded rod are installed inside the axially-mounted hole through bearings. One end of the horizontal external threaded rod is fixedly installed with a hand crank. A limiting sliding hole that sleeves on the rod body of the horizontal limiting rod and can move axially along the horizontal limiting rod is provided in the moving block. A horizontal internal threaded hole that is installed on the horizontal external threaded rod through a second threaded structure is provided in the moving block. The top of the moving block is provided with a fourth fixing plate that is integrally structured with the moving block and fixedly installed at the bottom end of the third fixing plate.

[0015] Preferably, the second threaded structure includes an internal threaded structure provided in the horizontal internal threaded hole and an external threaded structure provided on the rod body of the horizontal external threaded rod, and the internal threaded structure matches the external threaded structure.

[0016] Compared with the prior art, the present invention provides a high-precision machining device for the kingpin hole of an automotive steering knuckle, having the following beneficial effects: It can achieve an axial clamping effect on the automotive steering knuckle, so that after the steering knuckle is clamped, it is always subjected to an axial clamping force. In addition, after the device is clamped, it can provide a buffer effect with adjustable elastic strength, thereby generating the required pre-tightening force on the fixed threaded structure to improve the anti-compression ability of the device against mechanical vibration, and further achieving a stable workpiece clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the present invention; Figure 2 is a perspective sectional view of the present invention; Figure 3 is a perspective view of the combined clamping mechanism in the present invention; Figure 4 is a perspective sectional view of the combined clamping mechanism in the present invention; Figure 5 is a perspective view of the axial valve rod in the present invention; Figure 6 is a perspective view of the elastic pre-tightening tightening mechanism in the present invention; Figure 7 is a perspective sectional view of the elastic pre-tightening tightening mechanism in the present invention; Figure 8 is a perspective view of the threaded position adjusting mechanism in the present invention.

[0018] Wherein: 1. Combined clamping mechanism; 11. Lower clamping disc; 12. Upper clamping disc; 13. First fixing plate; 14. First shaft body moving hole; 15. Plum blossom-shaped limiting hole; 16. Plum blossom-shaped limiting groove; 17. Axial valve rod; 18. Plum blossom-shaped limiting convex block; 19. Shaft body fixing groove; 110. Force-applying rod; 2. Elastic pre-tightening type tightening mechanism; 21. Axial hollow housing; 22. Second fixing plate; 23. Lower convex ring structure; 24. Axial threaded rod; 25. Third fixing plate; 26. Axial component moving cavity; 27. Limiting sliding groove; 28. Inner moving plate; 29. Helical spring; 210. Inner moving ring; 211. Second shaft body moving hole; 212. Third shaft body moving hole; 213. Axial pull rod; 214. L-shaped connecting rod; 215. Outer sleeve ring; 216. Threaded sleeve; 217. Axial internal threaded hole; 3. Threaded type position adjusting mechanism; 31. Moving block; 32. Horizontal internal threaded hole; 33. Limiting sliding hole; 34. Fourth fixing plate; 35. Horizontal external threaded rod; 36. Horizontal limiting rod; 37. Fixed base; 38. Shaft body mounting hole; 39. Hand crank wheel. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0020] Please refer to Figure 1 and Figure 2 , a high-precision machining equipment for the kingpin hole of an automotive steering knuckle. The center of the automotive steering knuckle needs to be first ground to form a center hole by a milling machine, and the upper and lower end faces of the steering knuckle at the center hole need to be planar processed, and then the fixed base 37 is fixedly installed on the workbench.

[0021] In order to realize the effective clamping and fixing of the automotive steering knuckle and the function of facilitating taking and placing, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5, it is necessary to set up a combined clamping mechanism 1, which is internally provided with a lower clamping disc 11 and an upper clamping disc 12 that can clamp the steering knuckle at both ends of the central hole, and an axial valve stem 17 that can change the clamping distance between the lower clamping disc 11 and the upper clamping disc 12 after receiving an axial force. First, the upper surface of the lower clamping disc 11 is abutted against the convex bottom surface of the steering knuckle, then the axial valve stem 17 is passed through the central hole of the steering knuckle, and then the upper clamping disc 12 is sleeved around the axial valve stem 17. The axial valve stem 17 is screwed so that the plum blossom-shaped limit protrusion 18 is stuck in the plum blossom-shaped limit groove 16, and the clamping and fixing of the steering knuckle can be realized, thus realizing the effective clamping and fixing of the automotive steering knuckle and the function of facilitating taking and placing.

[0022] For the specific structure of the combined clamping mechanism 1, please refer to Figure 3 , Figure 4 and Figure 5 , it also includes a force-applying rod 110 integrally arranged at the center of the top end of the axial valve stem 17 for applying tension. A first fixing plate 13 with an integrated structure is arranged at the bottom of the lower clamping disc 11. A first shaft body movable hole 14 with an open end is arranged at the center of the lower clamping disc 11 and the upper clamping disc 12. Plum blossom-shaped limit holes 15 are arranged on the circumferential side surface of the lower clamping disc 11 and the upper clamping disc 12 at the first shaft body movable hole 14. A plum blossom-shaped limit groove 16 misaligned with the plum blossom-shaped limit holes 15 is arranged on the outer circumferential surface of the upper end surface of the upper clamping disc 12 at the first shaft body movable hole 14. A plum blossom-shaped limit protrusion 18 integrally structured with it is arranged on the outer circumferential surface of the axial valve stem 17 near its top end. An inwardly concave shaft body fixing groove 19 is arranged at the center of the bottom end of the axial valve stem 17. The structural shape formed by the axial valve stem 17 and the plum blossom-shaped limit protrusion 18, the structural shape formed by the first shaft body movable hole 14 and the plum blossom-shaped limit holes 15, and the structural shape formed by the first shaft body movable hole 14 and the plum blossom-shaped limit groove 16 are all the same, which is a plum blossom-shaped structure. The cross-sectional structural dimensions formed by the axial valve stem 17 and the plum blossom-shaped limit protrusion 18, the cross-sectional structural dimensions formed by the first shaft body movable hole 14 and the plum blossom-shaped limit holes 15, and the cross-sectional structural dimensions formed by the first shaft body movable hole 14 and the plum blossom-shaped limit groove 16 match each other.

[0023] In order to achieve the pre-tightening clamping and fixing effect of the steering knuckle, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7, it is necessary to set up an elastic pre-tightening tightening mechanism 2, which is internally provided with an axial hollow housing 21 fixedly installed at the bottom of the lower clamping plate 11 and hollow inside, an axial threaded rod 24 integrally arranged at the bottom end of the axial hollow housing 21 and externally sleeved with a threaded sleeve 216, an inner movable plate 28 placed inside the axial hollow housing 21 and capable of driving the axial valve rod 17 to move axially, an inner movable ring 210 located directly above the inner movable plate 28 and capable of moving axially with the threaded sleeve 216, and a helical spring 29 that generates an elastic acting force on the inner movable ring 210 and the inner movable plate 28. After the clamping and fixing of the lower clamping plate 11 and the upper clamping plate 12 are completed, the threaded sleeve 216 is rotated directionally. Due to the connection of the threaded structure, the threaded sleeve 216 will move downward and drive the inner movable ring 210 to move downward through the L-shaped connecting rod 214, thereby continuously compressing the helical spring 29. At this time, the elastic strength of the helical spring 29 will change, thereby increasing the pressure on the inner movable plate 28. The inner movable plate 28 will apply a downward elastic pressure on the upper clamping plate 12 through the axial pull rod 213 and the axial valve rod 17, so as to generate a necessary elastic clamping force between the lower clamping plate 11 and the upper clamping plate 12. Due to the elastic clamping, when mechanical vibration occurs during the machining of the steering knuckle, the elastic clamping of the helical spring 29 can produce a pre-tightening effect on the threaded structure, thereby preventing the steering knuckle from loosening between the lower clamping plate 11 and the upper clamping plate 12 due to vibration during the machining process, ensuring the stability of the drilling work, and further achieving the pre-tightening clamping and fixing effect on the steering knuckle.

[0024] For the specific structure of the elastic pre-tightening tightening mechanism 2, please refer to Figure 6 and Figure 7, further comprising an outer sleeve ring 215. The top end of the axially hollow housing 21 is provided with a second fixed plate 22 which is of an integral structure with the axially hollow housing 21 and fixedly installed at the bottom end of the first fixed plate 13. The bottom end of the axially hollow housing 21 is provided with a lower convex ring structure 23 which is of an integral structure with the axially hollow housing 21. The bottom end of the lower convex ring structure 23 is provided with an axially threaded rod 24 which is of an integral structure with the lower convex ring structure 23. The bottom end of the axially threaded rod 24 is provided with a third fixed plate 25 which is of an integral structure with the axially threaded rod 24. The center of the threaded sleeve 216 is provided with an axially internal threaded hole 217 which is installed on the outer part of the rod body of the axially threaded rod 24 through a first thread structure. The sleeve hole of the outer sleeve ring 215 is installed on the outer part of the barrel of the threaded sleeve 216 through a bearing. An axially component activity cavity 26 is arranged inside the axially hollow housing 21. The center of the top end of the axially hollow housing 21 is provided with a third shaft body activity hole 212 which communicates the top end of the axially component activity cavity 26 and the bottom end of the first shaft body activity hole 14. Two symmetrical limiting sliding grooves 27 are arranged at the circumferential wall thickness of the axially hollow housing 21. An inner moving plate 28 which can move axially along the axially component activity cavity 26 is placed inside the axially hollow housing 21 at the position of the axially component activity cavity 26. An inner moving ring 210 which can move axially along the axially component activity cavity 26 is placed inside the axially hollow housing 21 at the position of the axially component activity cavity 26. A spiral spring 29 is placed between the inner moving plate 28 and the inner moving ring 210. The center of the inner moving ring 210 is provided with a second shaft body activity hole 211 with both ends in an open state. The upper end part of the inner moving plate 28 is fixedly installed with an axially pull rod 213 which penetrates through the second shaft body activity hole 211 and the third shaft body activity hole 212. The top end of the axially pull rod 213 is fixedly installed inside the shaft body fixing groove 19. Two L-shaped connecting rods 214 which respectively penetrate through the limiting sliding grooves 27 are fixedly installed on the opposite sides of the inner moving ring 210. The bottom end of the L-shaped connecting rod 214 is fixedly installed at the upper end part of the outer sleeve ring 215. The first thread structure includes an internal thread structure arranged in the axially internal threaded hole 217 and an external thread structure arranged on the rod body of the axially threaded rod 24, and the internal thread structure matches the external thread structure. The structural radius of the third shaft body activity hole 212 is larger than the structural radius of the axially valve rod 17. The width of the limiting sliding groove 27 matches the structural diameter of the transverse rod body of the L-shaped connecting rod 214.

[0025] In order to realize the adjustment of the drilling position, please refer to Figure 1 , Figure 2 and Figure 8, it is necessary to set up a threaded position adjusting mechanism 3, which internally has a moving block 31 capable of driving the third fixed plate 25 to move, a horizontal limiting rod 36 inserted into the moving block 31 and capable of restricting the moving block 31 to move the moving block 31 horizontally, and a horizontal external threaded rod 35 installed at the center of the moving block 31 and capable of moving the moving block 31 when rotating. Rotate the handwheel 39 in a fixed direction. Due to the connection of the second threaded structure and the limiting function of the horizontal limiting rod 36, the moving block 31 will move in a fixed direction horizontally until the steering knuckle moves to the drilling position, thereby realizing the adjustment of the drilling position.

[0026] For the specific structure of the threaded position adjusting mechanism 3, please refer to Figure 1 , Figure 2 and Figure 8 , it also includes a handwheel 39 and two fixed bases 37. The two fixed bases 37 are symmetrically arranged, and a horizontal limiting rod 36 is fixedly installed on the symmetry plane of the fixed base 37. The fixed base 37 is provided with a shaft mounting hole 38 with both ends in an open state. The rod bodies at both ends of the horizontal external threaded rod 35 are installed inside the shaft mounting hole 38 through bearings. One end of the horizontal external threaded rod 35 is fixedly installed with a handwheel 39. The moving block 31 is provided with a limiting sliding hole 33 sleeved outside the rod body of the horizontal limiting rod 36 and capable of moving axially along the horizontal limiting rod 36. The moving block 31 is provided with a horizontal internal threaded hole 32 installed on the horizontal external threaded rod 35 through a second threaded structure. The top of the moving block 31 is provided with a fourth fixed plate 34 integrally structured with it and fixedly installed at the bottom end of the third fixed plate 25. The second threaded structure includes an internal threaded structure arranged in the horizontal internal threaded hole 32 and an external threaded structure arranged on the rod body of the horizontal external threaded rod 35, and the internal threaded structure matches the external threaded structure.

[0027] In use, the fixed base 37 is fixedly installed on the workbench. Then, the upper surface of the lower clamping disc 11 is abutted against the convex bottom surface of the steering knuckle. After that, the axial valve rod 17 is passed through the central hole of the steering knuckle. Then, the upper clamping disc 12 is sleeved around the axial valve rod 17. The axial valve rod 17 is screwed, so that the plum blossom-shaped limit convex block 18 is stuck in the plum blossom-shaped limit groove 16. The threaded sleeve 216 is rotated directionally. Due to the connection of the threaded structure, the threaded sleeve 216 will move downward, and drive the inner movable ring 210 to move downward through the L-shaped connecting rod 214, so as to continuously compress the spiral spring 29. At this time, the elastic strength of the spiral spring 29 will change, so as to increase the pressure on the inner movable plate 28. The inner movable plate 28 will apply a downward elastic pressure on the upper clamping disc 12 through the axial pull rod 213 and the axial valve rod 17, so as to generate a necessary elastic clamping force between the lower clamping disc 11 and the upper clamping disc 12. Due to the elastic clamping, when the steering knuckle generates mechanical vibration during the processing, the elastic clamping of the spiral spring 29 can produce a pre-tightening effect on the threaded structure, so as to prevent the steering knuckle from loosening between the lower clamping disc 11 and the upper clamping disc 12 due to vibration during the processing, so as to ensure the stability of the drilling work, and further realize the pre-tightening clamping and fixing effect of the steering knuckle.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision machining equipment for the kingpin hole of an automotive steering knuckle, characterized in that: including, a combined clamping mechanism (1), which is internally provided with a lower clamping disc (11) and an upper clamping disc (12) capable of clamping the steering knuckle at both ends of the central hole, and an axial valve stem (17) capable of changing the clamping distance between the lower clamping disc (11) and the upper clamping disc (12) after receiving an axial force; and an elastic pre-tightening tightening mechanism (2), which is internally provided with an axial hollow housing (21) fixedly installed at the bottom of the lower clamping disc (11) and in a hollow state inside, an axial threaded rod (24) integrally arranged at the bottom end of the axial hollow housing (21) and externally sleeved with a threaded sleeve (216), an inner movable plate (28) placed inside the axial hollow housing (21) and capable of driving the axial valve stem (17) to move axially, an inner movable ring (210) located directly above the inner movable plate (28) and capable of moving axially with the threaded sleeve (216), and a helical spring (29) that generates an elastic force on the inner movable ring (210) and the inner movable plate (28).

2. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 1, wherein: The combined clamping mechanism (1) further includes a force-applying rod (110) integrally arranged at the center of the top end of the axial valve stem (17) for applying a pulling force. A first fixing plate (13) with an integrated structure is arranged at the bottom of the lower clamping disc (11). A first shaft body movable hole (14) with an open end is arranged at the center of the lower clamping disc (11) and the upper clamping disc (12). The lower clamping disc (11) and the upper clamping disc (12) are provided with plum blossom-shaped limiting holes (15) on the circumferential side of the first shaft body movable hole (14). The upper end surface of the upper clamping disc (12) is provided with plum blossom-shaped limiting grooves (16) that are misaligned with the plum blossom-shaped limiting holes (15) on the outer circumferential surface of the first shaft body movable hole (14). The axial valve stem (17) is provided with a plum blossom-shaped limiting protrusion (18) integrally formed on the outer circumferential surface near its top end. An axially concave shaft body fixing groove (19) is arranged at the center of the bottom end of the axial valve stem (17).

3. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 2, wherein: The structural shape formed by the axial valve stem (17) and the plum blossom-shaped limiting protrusion (18), the structural shape formed by the first shaft body movable hole (14) and the plum blossom-shaped limiting holes (15), and the structural shape formed by the first shaft body movable hole (14) and the plum blossom-shaped limiting grooves (16) are all the same, and are all plum blossom-shaped structures.

4. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 3, characterized in that: The cross-sectional structural dimensions formed by the axial valve stem (17) and the plum blossom-shaped limiting protrusion (18), the cross-sectional structural dimensions formed by the first shaft body movable hole (14) and the plum blossom-shaped limiting holes (15), and the cross-sectional structural dimensions formed by the first shaft body movable hole (14) and the plum blossom-shaped limiting grooves (16) match each other.

5. A high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 4, characterized in that: The elastic pre-tightening tightening mechanism (2) further includes an outer sleeve ring (215). The top end of the axial hollow housing (21) is provided with a second fixed plate (22) which is of an integral structure with it and fixedly installed at the bottom end of the first fixed plate (13). The bottom end of the axial hollow housing (21) is provided with a lower convex ring structure (23) which is of an integral structure with it. The bottom end of the lower convex ring structure (23) is provided with an axial threaded rod (24) which is of an integral structure with it. The bottom end of the axial threaded rod (24) is provided with a third fixed plate (25). The center of the threaded sleeve (216) is provided with an axial internal threaded hole (217) which is installed on the outer part of the rod body of the axial threaded rod (24) through a first threaded structure. The sleeve hole of the outer sleeve ring (215) is installed on the outer part of the cylinder body of the threaded sleeve (216) through a bearing. The inside of the axial hollow housing (21) is provided with an axial component activity cavity (26). The center of the top end of the axial hollow housing (21) is provided with a third shaft activity hole (212) which communicates the top end of the axial component activity cavity (26) and the bottom end of the first shaft activity hole (14). Two symmetrical limit sliding grooves (27) are provided at the circumferential wall thickness of the axial hollow housing (21). An inner movable plate (28) which can move axially along the axial component activity cavity (26) is placed inside the axial hollow housing (21) at the position of the axial component activity cavity (26). An inner movable ring (210) which can move axially along the axial component activity cavity (26) is placed inside the axial hollow housing (21) at the position of the axial component activity cavity (26). A spiral spring (29) is placed between the inner movable plate (28) and the inner movable ring (210). The center of the inner movable ring (210) is provided with a second shaft activity hole (211) with both ends in an open state. The upper end part of the inner movable plate (28) is fixedly installed with an axial pull rod (213) which penetrates through the second shaft activity hole (211) and the third shaft activity hole (212). The top end of the axial pull rod (213) is fixedly installed inside the shaft fixed groove (19). Two L-shaped connecting rods (214) which respectively penetrate through the limit sliding grooves (27) are fixedly installed on the opposite sides of the inner movable ring (210). The bottom ends of the L-shaped connecting rods (214) are fixedly installed at the upper end part of the outer sleeve ring (215).

6. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 5, characterized in that: The first threaded structure includes an internal threaded structure arranged in the axial internal threaded hole (217) and an external threaded structure arranged on the rod body of the axial threaded rod (24), and the internal threaded structure matches the external threaded structure.

7. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 6, characterized in that: The structural radius of the third shaft activity hole (212) is larger than the structural radius of the axial valve rod (17). The width of the limit sliding groove (27) matches the structural diameter of the transverse rod body of the L-shaped connecting rod (214).

8. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 7, characterized in that: It further includes a threaded position adjustment mechanism (3), which internally has a moving block (31) capable of driving the third fixed plate (25) to move, a horizontal limiting rod (36) inserted into the moving block (31) and capable of restricting the moving block (31) to move the moving block (31) in the horizontal direction, and a horizontal external threaded rod (35) installed at the center of the moving block (31) and capable of moving the moving block (31) when rotating.

9. The high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 8, characterized in that: The threaded position adjustment mechanism (3) further includes a hand crank (39) and two fixed bases (37). The two fixed bases (37) are symmetrically arranged, and the horizontal limiting rod (36) is fixedly installed on the symmetry plane of the fixed base (37). An axle body installation hole (38) with both ends in an open state is provided in the fixed base (37). The rod bodies at both ends of the horizontal external threaded rod (35) are installed inside the axle body installation hole (38) through bearings. One end of the horizontal external threaded rod (35) is fixedly installed with a hand crank (39). A limiting sliding hole (33) sleeved on the rod body of the horizontal limiting rod (36) and capable of moving axially along the horizontal limiting rod (36) is provided in the moving block (31). A horizontal internal threaded hole (32) installed on the horizontal external threaded rod (35) through a second threaded structure is provided in the moving block (31). The top of the moving block (31) is provided with a fourth fixed plate (34) integrally formed with it and fixedly installed at the bottom end of the third fixed plate (25).

10. A high-precision machining equipment for the kingpin hole of an automotive steering knuckle according to claim 9, characterized in that: The second threaded structure includes an internal threaded structure provided in the horizontal internal threaded hole (32) and an external threaded structure provided on the rod body of the horizontal external threaded rod (35), and the internal threaded structure matches the external threaded structure.

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