A high-precision machining equipment for the kingpin hole of an automotive steering knuckle

Abstract

The present invention relates to the technical field of clamping and fixing tools, and discloses a high-precision machining device for the kingpin hole of an automobile steering knuckle, comprising a combined clamping mechanism and an elastic preloaded tightening mechanism. This high-precision machining device for the kingpin hole of an automobile steering knuckle can provide an axial clamping effect on the automobile steering knuckle, ensuring that the knuckle is always subjected to an axial clamping force after being clamped. Furthermore, after clamping, the device can provide a buffering effect with adjustable elastic strength, thereby generating the required preload force on the fixed threaded structure, thereby improving the device's resistance to mechanical vibration and providing a stable workpiece clamping effect.

Description

Technical Field

[0001] The invention relates to the technical field of clamping and fixing tools, in particular to high-precision processing equipment for a kingpin hole of an automobile steering knuckle. Background Art

[0002] The vehicle steering knuckle is an important component of the vehicle. When processing the vehicle steering knuckle, the pin hole needs to be processed, so corresponding processing equipment is needed.

[0003] For example, a Chinese patent with publication number "CN119733866A" discloses "a high-precision processing equipment for the kingpin hole of an automobile steering knuckle", whose main structure includes a workbench and a steering knuckle body, a vertical drilling machine is provided on the workbench, and a cutter head is provided on the vertical drilling machine, and the cutter head is arranged above the steering knuckle body, the steering knuckle body includes a kingpin hole located in the middle position, and a first arm body and a second arm body, and also includes a support seat, the support seat is arranged on the lower end face of the steering knuckle body, for placing the steering knuckle body, a first positioning device, the first positioning device includes a steering table arranged on the workbench, a first cylinder and a fixed plate are provided on the steering table, the upper end of the first cylinder is hinged with a pressure rod, a connecting plate is provided in the middle of the pressure rod, and the fixing plate is connected through the connecting plate, and the end of the pressure rod is arranged above the first arm body. The high-precision processing equipment for the kingpin hole of an automobile steering knuckle can stably fix the steering knuckle body on the workbench by arranging the first positioning device, the second positioning device and the third positioning device.

[0004] However, since the surface of the automobile steering knuckle at the pin connection part is not a flat structure but a corresponding curved structure, the above-mentioned automobile steering knuckle kingpin hole high-precision processing equipment uses multiple non-axial joints and multiple non-axial connecting rods to fix the steering knuckle when fixing the corresponding part. Due to the large number of joints and connecting rods, during the fixing process, the drilling equipment will vibrate when it contacts the steering knuckle. The vibration is accompanied by multiple joints and multiple connecting rods, which is prone to mechanical loosening, resulting in accuracy deviation of the steering knuckle during the processing. Therefore, there is a phenomenon of poor processing accuracy due to unstable clamping of the workpiece. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a high-precision processing equipment for the kingpin hole of an automobile steering knuckle, which can perform an axial clamping effect on the automobile steering knuckle, so that the steering knuckle is always subjected to an axial clamping force after being clamped. In addition, after clamping, the device can provide a buffering effect with adjustable elastic strength, thereby generating the required pre-tightening force on the fixed threaded structure, so as to improve the equipment's ability to resist mechanical vibration, thereby achieving a stable workpiece clamping effect, and solving the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-precision processing equipment for the kingpin hole of an automobile steering knuckle, comprising a combined clamping mechanism, internally provided with a lower clamping plate and an upper clamping plate capable of clamping the steering knuckle at both ends of the center hole, and an axial valve stem capable of changing the clamping distance between the lower clamping plate and the upper clamping plate after being subjected to an axial force; and an elastic pre-tightening tightening mechanism, internally provided with an axial hollow shell fixedly mounted on the bottom of the lower clamping plate and having a hollow interior, an axial threaded rod integrally arranged at the bottom end of the axial hollow shell and having a threaded sleeve sleeved on the outside, an inner movable plate placed inside the axial hollow shell and capable of driving the axial valve stem to move axially, an inner movable ring located directly above the inner movable plate and capable of axially moving with the threaded sleeve, and a coil spring that generates an elastic force on the inner movable ring and the inner movable plate.

[0007] Preferably, the combined clamping mechanism also includes a force rod integrally arranged at the center of the top end of the axial valve stem and used to apply tension, the bottom of the lower clamping plate is provided with a No. 1 fixing plate integrally formed with it, the centers of the lower clamping plate and the upper clamping plate are provided with a No. 1 shaft movable hole with an open end, the lower clamping plate and the upper clamping plate are provided with a plum blossom-shaped limiting hole on the circumferential side surface of the No. 1 shaft movable hole, the upper end face of the upper clamping plate is provided with a plum blossom-shaped limiting groove staggered with the plum blossom-shaped limiting hole on the outer circumferential surface of the No. 1 shaft movable hole, the axial valve stem is provided with a plum blossom-shaped limiting protrusion integral with it on the outer circumferential surface near its top, and the bottom end center of the axial valve stem is provided with a shaft fixing groove with an inwardly concave structure.

[0008] Preferably, the structural shape formed by the axial valve stem and the plum blossom-shaped limiting protrusion, the structural shape formed by the No. 1 shaft movable hole and the plum blossom-shaped limiting hole, and the structural shape formed by the No. 1 shaft movable hole and the plum blossom-shaped limiting groove are consistent and are all plum blossom-shaped structures.

[0009] Preferably, the cross-sectional structural dimensions formed by the axial valve stem and the plum blossom-shaped limiting protrusion, the cross-sectional structural dimensions formed by the No. 1 shaft movable hole and the plum blossom-shaped limiting hole, and the cross-sectional structural dimensions formed by the No. 1 shaft movable hole and the plum blossom-shaped limiting groove match each other.

[0010] Preferably, the elastic pre-tightening tightening mechanism also includes an outer ring, the top of the axial hollow shell is provided with a second fixing plate integrally formed with it and fixedly installed at the bottom end of the No. 1 fixing plate, the bottom end of the axial hollow shell is provided with a lower raised ring structure integrally formed with it, the bottom end of the lower raised ring structure is provided with an axial threaded rod integrally formed with it, the bottom end of the axial threaded rod is provided with a No. 3 fixing plate integrally formed with it, the center of the threaded sleeve is provided with an axial internal threaded hole installed on the outside of the axial threaded rod body through the No. 1 threaded structure, the sleeve hole of the outer ring is installed on the outside of the cylinder of the threaded sleeve through a bearing, the interior of the axial hollow shell is provided with an axial component movable cavity, the top center of the axial hollow shell is provided with a No. 3 shaft movable hole connecting the top end of the axial component movable cavity and the bottom end of the No. 1 shaft movable hole, the shaft The axial hollow shell is provided with two symmetrical limiting sliding grooves at the circumferential wall thickness of the hollow shell, and the axial hollow shell is provided with an inner movable plate which can move axially along the movable cavity of the axial part, and the axial hollow shell is provided with an inner movable ring which can move axially along the movable cavity of the axial part, and the axial hollow shell is provided with an inner movable plate which can move axially along the movable cavity of the axial part, and a coil spring is provided between the inner movable plate and the inner movable ring, and a No. 2 shaft movable hole with open ends is provided in the center of the inner movable ring, and an axial pull rod which passes through the No. 2 shaft movable hole and the No. 3 shaft movable hole is fixedly installed on the upper end of the inner movable plate, and the top end of the axial pull rod is fixedly installed in the interior of the shaft fixing groove, and two L-shaped connecting rods which respectively pass through the limiting sliding grooves are fixedly installed on the corresponding sides of the inner movable ring, and the bottom end of the L-shaped connecting rod is fixedly installed on the upper end of the outer ring.

[0011] Preferably, the No. 1 thread structure includes an internal thread structure provided in the axial internal thread hole and an external thread structure provided on the axial thread rod body, and the internal thread structure matches the external thread structure.

[0012] Preferably, the structural radius of the movable hole of the No. 3 shaft body is larger than the structural radius of the axial valve stem, and the width of the limiting sliding groove matches the structural diameter of the L-shaped connecting rod transverse rod body.

[0013] Preferably, it also includes a threaded position adjustment mechanism, which is internally provided with a moving block that can drive the No. 3 fixed plate to move, a horizontal limit rod inserted into the moving block and capable of limiting the moving block so that the moving block moves in the horizontal direction, and a horizontal external threaded rod installed at the center of the moving block and capable of moving the moving block when rotated.

[0014] Preferably, the threaded position adjustment mechanism also includes a hand-cranked wheel and two fixed bases, the two fixed bases are symmetrically arranged, and a horizontal limit rod is fixedly installed on the symmetrical surface of the fixed base, the fixed base is provided with an axis mounting hole with open ends at both ends, the rod bodies at both ends of the horizontal external threaded rod are installed inside the axis mounting hole through bearings, and a hand-cranked wheel is fixedly installed on one end of the horizontal external threaded rod, and the moving block is provided with a limiting sliding hole that is sleeved on the outside of the rod body of the horizontal limit rod and can move axially along the horizontal limit rod, and the moving block is provided with a horizontal internal threaded hole that is installed on the horizontal external threaded rod through the No. 2 threaded structure, and the top of the moving block is provided with a No. 4 fixed plate that is an integral structure with it and fixedly installed on the bottom end of the No. 3 fixed plate.

[0015] Preferably, the No. 2 thread structure includes an internal thread structure provided in the horizontal internal thread hole and an external thread structure provided on the horizontal external thread rod body, and the internal thread structure matches the external thread structure.

[0016] Compared with the prior art, the present invention provides a high-precision machining device for the kingpin hole of an automobile steering knuckle, which has the following beneficial effects:

[0017] It can perform an axial clamping effect on the steering knuckle of the automobile, so that the steering knuckle is always subjected to an axial clamping force after being clamped. In addition, after clamping, the device can provide a buffering effect with adjustable elastic strength, thereby generating the required pre-tightening force on the fixed threaded structure to improve the equipment's resistance to mechanical vibration, thereby achieving a stable workpiece clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of the present invention;

[0019] Figure 2 is a three-dimensional cross-sectional view of the present invention;

[0020] Figure 3 A three-dimensional diagram of the combined clamping mechanism of the present invention;

[0021] Figure 4 is a three-dimensional cross-sectional view of the combined clamping mechanism of the present invention;

[0022] Figure 5 A perspective view of the axial valve stem of the present invention;

[0023] Figure 6 It is a three-dimensional diagram of the elastic pre-tightening tightening mechanism of the present invention;

[0024] Figure 7 It is a three-dimensional cross-sectional view of the elastic pre-tightening tightening mechanism of the present invention;

[0025] Figure 8It is a three-dimensional diagram of the threaded position adjustment mechanism of the present invention.

[0026] Wherein: 1. Combined clamping mechanism; 11. Lower clamping plate; 12. Upper clamping plate; 13. No. 1 fixing plate; 14. No. 1 shaft movable hole; 15. Plum blossom-shaped limit hole; 16. Plum blossom-shaped limit groove; 17. Axial valve stem; 18. Plum blossom-shaped limit bump; 19. Shaft fixing groove; 110. Force rod; 2. Elastic preloaded tightening mechanism; 21. Axial hollow housing; 22. No. 2 fixing plate; 23. Lower raised ring structure; 24. Axial threaded rod; 25. No. 3 fixing plate; 26. Axial component movable cavity; 27. Limiting slide groove; 28. Inner movable plate; 29. Coil spring; 210. Inner movable ring; 211. Movable hole of shaft No. 2; 212. Movable hole of shaft No. 3; 213. Axial pull rod; 214. L-shaped connecting rod; 215. Outer ring; 216. Threaded sleeve; 217. Axial internal threaded hole; 3. Threaded position adjustment mechanism; 31. Moving block; 32. Horizontal internal threaded hole; 33. Limiting sliding hole; 34. Fixed plate No. 4; 35. Horizontal external threaded rod; 36. Horizontal limiting rod; 37. Fixed base; 38. Shaft mounting hole; 39. Hand crank. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1 and Figure 2 , a high-precision processing equipment for the kingpin hole of an automobile steering knuckle. The center of the automobile steering knuckle needs to be polished out of the center hole by a milling machine first, and the upper and lower end surfaces of the steering knuckle at the center hole need to be plane-processed, and then the fixed base 37 is fixedly installed on the workbench.

[0029] In order to achieve effective clamping and fixing of the car steering knuckle and facilitate the removal and placement, 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 plate 11 and an upper clamping plate 12 that can clamp the steering knuckle at both ends of the center hole, and an axial valve stem 17 that can change the clamping distance between the lower clamping plate 11 and the upper clamping plate 12 after being subjected to axial force. First, the upper surface of the lower clamping plate 11 is pressed against the outer convex bottom surface of the steering knuckle, and then the axial valve stem 17 is passed through the center hole of the steering knuckle, and then the upper clamping plate 12 is sleeved on the outer periphery of the axial valve stem 17, and the axial valve stem 17 is screwed so that the plum blossom-shaped limiting protrusion 18 is stuck in the plum blossom-shaped limiting groove 16, so that the steering knuckle can be clamped and fixed, thereby realizing the effective clamping and fixation of the automobile steering knuckle and the function of facilitating the picking and placing.

[0030] For the specific structure of the combined clamping mechanism 1, please refer to Figure 3 、 Figure 4 and Figure 5 , also includes a force rod 110 that is integrally arranged at the center of the top end of the axial valve stem 17 and is used to apply tension, the bottom of the lower clamping disk 11 is provided with a No. 1 fixing plate 13 with an integral structure therewith, and the centers of the lower clamping disk 11 and the upper clamping disk 12 are provided with a No. 1 shaft movable hole 14 with an open end, and the lower clamping disk 11 and the upper clamping disk 12 are provided with a plum blossom-shaped limiting hole 15 on the circumferential side surface of the No. 1 shaft movable hole 14, and the upper end surface of the upper clamping disk 12 is provided with a plum blossom-shaped limiting groove 16 that is staggered with the plum blossom-shaped limiting hole 15 on the outer circumferential surface of the No. 1 shaft movable hole 14, and the axial valve stem 17 is provided with a The integrated structure of the plum blossom-shaped limiting protrusion 18, the bottom center of the axial valve stem 17 is provided with an inward-concave shaft fixing groove 19, the structural shape formed by the axial valve stem 17 and the plum blossom-shaped limiting protrusion 18, the structural shape formed by the No. 1 shaft movable hole 14 and the plum blossom-shaped limiting hole 15, and the structural shape formed by the No. 1 shaft movable hole 14 and the plum blossom-shaped limiting groove 16 are consistent and are all plum blossom-shaped structures, the cross-sectional structural dimensions of the axial valve stem 17 and the plum blossom-shaped limiting protrusion 18, the cross-sectional structural dimensions of the No. 1 shaft movable hole 14 and the plum blossom-shaped limiting hole 15, and the cross-sectional structural dimensions of the No. 1 shaft movable hole 14 and the plum blossom-shaped limiting groove 16 match each other.

[0031] To achieve a pre-tightened clamping effect on the steering knuckle, 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 shell 21 fixedly mounted on the bottom of the lower clamping disk 11 and having a hollow interior, an axial threaded rod 24 integrally arranged at the bottom end of the axial hollow shell 21 and having a threaded sleeve 216 sleeved on the outside, an inner movable plate 28 placed inside the axial hollow shell 21 and capable of driving the axial valve stem 17 to move axially, an inner movable ring 210 located just above the inner movable plate 28 and capable of axially moving with the threaded sleeve 216, and a coil spring 29 that generates an elastic force on the inner movable ring 210 and the inner movable plate 28. After completing the clamping and fixing of the lower clamping disk 11 and the upper clamping disk 12, the threaded sleeve 216 is rotated in a directional manner. Due to the connection of the threaded structure, the threaded sleeve 216 will move downward and pass through the L-shaped connecting rod 2 14 drives the inner movable ring 210 to move downward, thereby producing a continuous compression function on the coil spring 29. At this time, the elastic strength of the coil spring 29 will change, thereby increasing the pressure on the inner movable plate 28, and the inner movable plate 28 will apply downward elastic pressure to the upper clamping plate 12 through the axial pull rod 213 and the axial valve stem 17, thereby generating the necessary elastic clamping force between the lower clamping plate 11 and the upper clamping plate 12. Due to the elastic clamping, when the steering knuckle generates mechanical vibration during the processing, the elastic clamping of the coil spring 29 can produce a pre-tightening effect on the threaded structure, thereby preventing the steering knuckle from loosening in the lower clamping plate 11 and the upper clamping plate 12 due to vibration during the processing, so as to ensure the stability of the drilling work, and then achieve a pre-tightening clamping and fixing effect on the steering knuckle.

[0032] For the specific structure of the elastic pre-tightening tightening mechanism 2, please refer to Figure 6 and Figure 7, also includes an outer ring 215, the top of the axial hollow shell 21 is provided with a second fixing plate 22 which is an integral structure with it and fixedly mounted on the bottom end of the first fixing plate 13, the bottom end of the axial hollow shell 21 is provided with a lower raised ring structure 23 which is an integral structure with it, the bottom end of the lower raised ring structure 23 is provided with an axial threaded rod 24 which is an integral structure with it, the bottom end of the axial threaded rod 24 is provided with a third fixing plate 25 which is an integral structure with it, the center of the threaded sleeve 216 is provided with an axial internal threaded hole 21 which is mounted on the outside of the rod body of the axial threaded rod 24 through the first threaded structure 7. The sleeve hole of the outer ring 215 is installed on the outside of the cylinder of the threaded sleeve 216 through a bearing. The interior of the axial hollow shell 21 is provided with an axial component movable cavity 26. The top center of the axial hollow shell 21 is provided with a third shaft movable hole 212 connecting the top of the axial component movable cavity 26 and the bottom of the first shaft movable hole 14. Two symmetrical limiting grooves 27 are provided at the circumferential wall thickness of the axial hollow shell 21. The axial hollow shell 21 is provided with an inner movable plate 28 capable of axial movement along the axial component movable cavity 26 inside the axial component movable cavity 26. The axial hollow shell 21 is provided with an inner movable ring 210 which can move axially along the axial component movable cavity 26, and a coil spring 29 is provided 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 movable hole 211 with both ends being open. The upper end of the inner movable plate 28 is fixedly installed with an axial pull rod 213 which passes through the second shaft movable hole 211 and the third shaft movable hole 212. The top end of the axial pull rod 213 is fixedly installed in the interior of the shaft fixing groove 19. The movable ring 210 is fixedly provided with two L-shaped connecting rods 214 on opposite sides, each of which passes through the limiting groove 27. The bottom end of the L-shaped connecting rod 214 is fixedly provided on the upper end of the outer ring 215. The No. 1 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. The structural radius of the No. 3 shaft movable hole 212 is larger than the structural radius of the axial valve stem 17, and the width of the limiting groove 27 matches the structural diameter of the transverse rod body of the L-shaped connecting rod 214.

[0033] To adjust the drilling position, refer to Figure 1 、 Figure 2 and Figure 8, it is necessary to set up a threaded position adjustment mechanism 3, which is internally provided with a moving block 31 that can drive the No. 3 fixed plate 25 to move, a horizontal limit rod 36 inserted into the moving block 31 and capable of limiting the moving block 31 so that the moving block 31 moves 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 rotated, and a directionally rotating hand wheel 39. Due to the No. 2 threaded structure connection and the limiting function of the horizontal limit rod 36, the moving block 31 will produce a directionally moving in the horizontal direction until the steering knuckle moves to the drilling position, thereby realizing the adjustment of the drilling position.

[0034] For the specific structure of the threaded position adjustment mechanism 3, please refer to Figure 1 、 Figure 2 and Figure 8 , also includes a hand-cranked wheel 39 and two fixed bases 37, the two fixed bases 37 are symmetrically arranged, and the symmetrical planes of the fixed bases 37 are fixedly installed with a horizontal limit rod 36, and the fixed base 37 is provided with an axis mounting hole 38 with both ends being open. The rod bodies at both ends of the horizontal externally threaded rod 35 are mounted inside the axis mounting hole 38 through bearings, and one end of the horizontal externally threaded rod 35 is fixedly installed with a hand-cranked wheel 39, and the movable block 31 is provided with a sleeve placed on the outside of the rod body of the horizontal limit rod 36 And a limiting sliding hole 33 capable of axial movement 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 No. 2 threaded structure, and the top of the moving block 31 is provided with a No. 4 fixing plate 34 which is an integral structure with it and fixedly installed at the bottom end of the No. 3 fixing plate 25, the No. 2 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.

[0035] During use, the fixed base 37 is fixedly mounted on the workbench, and the upper surface of the lower clamping plate 11 is pressed against the outer convex bottom surface of the steering knuckle, and then the axial valve stem 17 is passed through the center hole of the steering knuckle, and the upper clamping plate 12 is sleeved on the outer periphery of the axial valve stem 17, and the axial valve stem 17 is screwed so that the plum blossom-shaped limiting protrusion 18 is stuck in the plum blossom-shaped limiting groove 16, and the threaded sleeve 216 is rotated in a direction. Due to the connection of the threaded structure, the threaded sleeve 216 will move downward, and the inner movable ring 210 will be driven downward by the L-shaped connecting rod 214, thereby generating a continuous compression function for the coil spring 29. At this time, the elastic strength of the coil spring 29 is It will change, thereby increasing the pressure on the inner movable plate 28, and the inner movable plate 28 will apply downward elastic pressure to the upper clamping plate 12 through the axial pull rod 213 and the axial valve stem 17, so that the necessary elastic clamping force is generated between the lower clamping plate 11 and the upper clamping plate 12. Due to the elastic clamping, when the steering knuckle generates mechanical vibration during the processing, the elastic clamping of the coil spring 29 can produce a pre-tightening effect on the threaded structure, thereby preventing the steering knuckle from loosening in the lower clamping plate 11 and the upper clamping plate 12 due to vibration during the processing, so as to ensure the stability of the drilling work, and then achieve a pre-tightening clamping and fixing effect on the steering knuckle.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision machining equipment for kingpin holes of automobile steering knuckles, characterized by: include, A combined clamping mechanism (1) is provided with a lower clamping plate (11) and an upper clamping plate (12) capable of clamping the steering knuckle at both ends of the center hole, and an axial valve stem (17) capable of changing the clamping distance between the lower clamping plate (11) and the upper clamping plate (12) after receiving an axial force; and an elastic pre-tightening tightening mechanism (2), which is provided with an axial hollow shell (21) fixedly mounted on the bottom of the lower clamping plate (11) and having a hollow interior, an axial threaded rod (24) integrally arranged at the bottom end of the axial hollow shell (21) and having a threaded sleeve (216) sleeved on the outside, an inner movable plate (28) placed inside the axial hollow shell (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 axially moving with the threaded sleeve (216), and a coil spring (29) generating an elastic force on the inner movable ring (210) and the inner movable plate (28); The combined clamping mechanism (1) further comprises a force rod (110) integrally provided at the top center of the axial valve stem (17) and used for applying a pulling force, a No. 1 fixing plate (13) integrally provided at the bottom of the lower clamping plate (11), a No. 1 shaft movable hole (14) with an open end portion provided at the center of the lower clamping plate (11) and the upper clamping plate (12), and a No. 1 shaft movable hole (14) located at the No. 1 shaft movable hole (14) provided at the center of the lower clamping plate (11) and the upper clamping plate (12). ) is provided with a plum blossom-shaped limiting hole (15) on the circumferential side surface, the upper end surface of the upper clamping disk (12) is provided with a plum blossom-shaped limiting groove (16) arranged in a staggered arrangement with the plum blossom-shaped limiting hole (15) on the outer circumferential surface located at the No. 1 shaft movable hole (14), the axial valve stem (17) is provided with a plum blossom-shaped limiting protrusion (18) of an integral structure with the axial valve stem (17) on the outer circumferential surface near the top thereof, and the bottom center of the axial valve stem (17) is provided with a shaft fixing groove (19) of an inner concave structure; The elastic pre-tightening tightening mechanism (2) further comprises an outer sleeve (215), the top end of the axial hollow shell (21) is provided with a second fixing plate (22) which is an integral structure with the axial hollow shell (21) and fixedly mounted on the bottom end of the first fixing plate (13), the bottom end of the axial hollow shell (21) is provided with a lower raised ring structure (23) which is an integral structure with the axial hollow shell (21), the bottom end of the lower raised ring structure (23) is provided with an axial threaded rod (24) which is an integral structure with the axial hollow shell (21), the bottom end of the axial threaded rod (24) is provided with a third fixing plate (25) which is an integral structure with the axial hollow shell (21), and the threaded sleeve The center of (216) is provided with an axial internal threaded hole (217) which is installed on the outside of the rod body of the axial threaded rod (24) through a No. 1 threaded structure. The sleeve hole of the outer ring (215) is installed on the outside of the cylinder body of the threaded sleeve (216) through a bearing. The interior of the axial hollow shell (21) is provided with an axial component movable cavity (26). The top center of the axial hollow shell (21) is provided with a No. 3 shaft movable hole (212) which connects the top of the axial component movable cavity (26) and the bottom of the No. 1 shaft movable hole (14). The circumferential wall of the axial hollow shell (21) is provided with a plurality of axial movable holes (213). Two symmetrical limiting grooves (27) are provided at the thick part of the axial hollow shell (21), an inner movable plate (28) capable of axially moving along the axial component movable cavity (26) is placed inside the axial component movable cavity (26), and an inner movable ring (210) capable of axially moving along the axial component movable cavity (26) is placed inside the axial hollow shell (21), a coil spring (29) is placed between the inner movable plate (28) and the inner movable ring (210), and the center of the inner movable ring (210) is provided. There is a No. 2 shaft movable hole (211) with both ends being open, and an axial pull rod (213) penetrating the No. 2 shaft movable hole (211) and the No. 3 shaft movable hole (212) is fixedly installed on the upper end of the inner movable plate (28), and the top end of the axial pull rod (213) is fixedly installed inside the shaft fixing groove (19), and the inner movable ring (210) is fixedly installed on the opposite sides with two L-shaped connecting rods (214) respectively penetrating the limiting sliding groove (27), and the bottom end of the L-shaped connecting rod (214) is fixedly installed on the upper end of the outer ring (215).

2. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 1, characterized in that: The structural shape formed by the axial valve stem (17) and the plum blossom-shaped limiting protrusion (18), the structural shape formed by the No. 1 shaft movable hole (14) and the plum blossom-shaped limiting hole (15), and the structural shape formed by the No. 1 shaft movable hole (14) and the plum blossom-shaped limiting groove (16) are consistent and all have a plum blossom-shaped structure.

3. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 2, 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 No. 1 shaft movable hole (14) and the plum blossom-shaped limiting hole (15), and the cross-sectional structural dimensions formed by the No. 1 shaft movable hole (14) and the plum blossom-shaped limiting groove (16) match each other.

4. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 1, characterized in that: The No. 1 thread structure comprises an internal thread structure provided in the axial internal thread hole (217) and an external thread structure provided on the rod body of the axial thread rod (24), and the internal thread structure matches the external thread structure.

5. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 4, characterized in that: The structural radius of the third shaft movable hole (212) is greater than the structural radius of the axial valve stem (17), and the width of the limiting sliding groove (27) matches the structural diameter of the transverse rod body of the L-shaped connecting rod (214).

6. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 5, characterized in that: The invention also includes a threaded position adjustment mechanism (3), which is internally provided with a moving block (31) capable of driving the third fixed plate (25) to move, a horizontal limit rod (36) inserted into the moving block (31) and capable of limiting the moving block (31) so that the moving block (31) moves in a horizontal direction, and a horizontal external thread rod (35) installed at the center of the moving block (31) and capable of moving the moving block (31) when rotating.

7. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 6, characterized in that: The threaded position adjustment mechanism (3) further includes a hand-cranked wheel (39) and two fixed bases (37), the two fixed bases (37) are symmetrically arranged, and a horizontal limit rod (36) is fixedly installed on the symmetrical surface of the fixed base (37), and a shaft mounting hole (38) with both ends being open is provided in the fixed base (37), and the rod bodies at both ends of the horizontal external thread rod (35) are mounted inside the shaft mounting hole (38) through bearings, and the horizontal external thread rod (35) is fixed with the shaft mounting hole (38) through bearings. A hand wheel (39) is fixedly installed at one end, and a limiting sliding hole (33) is provided in the moving block (31) and is placed outside the rod body of the horizontal limiting rod (36) and can move axially along the horizontal limiting rod (36). A horizontal internal threaded hole (32) is provided in the moving block (31) and is installed on the horizontal external threaded rod (35) through a second threaded structure. A fourth fixing plate (34) is provided on the top of the moving block (31) and is integrally structured with the moving block and fixedly installed at the bottom end of the third fixing plate (25).

8. The high-precision machining equipment for kingpin holes of automobile steering knuckles according to claim 7, characterized in that: The second thread structure comprises an internal thread structure provided in the horizontal internal thread hole (32) and an external thread structure provided on the rod body of the horizontal external thread rod (35), and the internal thread structure matches the external thread structure.

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