A machining clamping tool for an automobile chassis steering knuckle

Abstract

The present application belongs to the field of machine tool processing fixture, and particularly relates to a machining clamping tool for automobile chassis steering knuckle, which comprises a base and a side plate arranged on the base, the base is detachably fixedly connected with a machining table, the tool further comprises a connecting shaft, the connecting shaft comprises a fixed disc and arc-shaped bearing bush, installation gaps are arranged between the arc-shaped bearing bushes, a tensioning driving device is arranged in the installation gaps, and one end of the two sets of arc-shaped bearing bushes is embedded in a sliding groove and has a sliding freedom degree of expanding or reducing the width of the installation gaps by means of the sliding groove. The machining clamping tool adopts arc-shaped bearing bush to form a tensioning connection with the journal hole of the steering knuckle, a rotation-preventing auxiliary positioning mechanism is arranged to support the shock-absorbing connecting arm of the steering knuckle, the rotation of the steering knuckle in the machining process is prevented, the journal hole of the steering knuckle and the shock-absorbing connecting arm belong to inherent structures, and steering knuckles with various structural forms can be clamped, only the machining program of the machine tool needs to be adjusted, the repeated clamping time is saved, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of machine tool clamps, and particularly relates to a machining clamping tool for an automobile chassis steering knuckle. BACKGROUND

[0002] The automobile chassis steering knuckle is a core component for connecting wheels, suspension systems and steering systems, and its structure needs to adapt to complex assembly relationships and mechanical requirements, and is usually formed by a casting process.

[0003] The steering knuckle is a multifunctional highly integrated component, and thus its shape is a special structure, which not only contains multiple irregular curved surfaces, bosses and grooves, but also needs to be machined at different positions such as shaft necks, mounting holes, steering arm connecting surfaces and holes after casting to meet assembly precision and motion stability requirements.

[0004] The current clamping tool needs to be repeatedly disassembled and replaced with a special clamping tool when machining different positions, and a corresponding tool needs to be specially configured for steering knuckles of different vehicle models, which has a high hardware cost, and also needs to be matched with a special machine tool or machining center to switch processing programs, so that the whole machining process is complicated and restricts the improvement of machining efficiency. SUMMARY

[0005] In order to solve the problems existing in the prior art, the application provides a machining clamping tool for an automobile chassis steering knuckle, which can effectively improve clamping efficiency and improve the universality of the clamp, thereby helping to reduce equipment cost and improve machining efficiency.

[0006] The specific technical scheme adopted by the application is:

[0007] A machining clamping tool for an automobile chassis steering knuckle is arranged on a machining table, and includes a base and a side plate arranged on the base, the base is in detachable fixed connection with the machining table, the tool further includes a connecting shaft, the connecting shaft is arranged horizontally on the side plate, the shaft neck hole of the steering knuckle is detachably arranged on the connecting shaft, the connecting shaft includes a fixed disc and two groups of arc-shaped bearing bushes arranged symmetrically left and right, an installation gap is arranged between the arc-shaped bearing bushes, a tensioning driving device is arranged in the installation gap, a sliding groove is arranged on the fixed disc, one end of the two groups of arc-shaped bearing bushes is embedded in the sliding groove and has a sliding freedom degree of expanding or reducing the width of the installation gap by means of the sliding groove, and an anti-rotation auxiliary positioning mechanism is further arranged on the base.

[0008] The tensioning drive device comprises a pull shaft, a swing arm and a strip-shaped sliding prop, the swing arm is provided with a sliding hinge shaft, the two ends of the sliding hinge shaft are respectively inserted into two arc-shaped bearing bushings, the two ends of the sliding hinge shaft have a sliding freedom with the arc-shaped bearing bushings expanding or shrinking, one end of the swing arm is inserted into a limiting slot on the pull shaft to form a nested limiting, the other end is inserted into a limiting slot on the sliding prop to form a nested limiting, the width of the limiting slot is greater than the width of the inserted end of the swing arm, the swing wedge is further provided on the sliding prop, the swing wedge is lifted to between the two arc-shaped bearing bushings by the first locking push block when the sliding prop moves, and the swing wedge is in abutting limiting with the two arc-shaped bearing bushings.

[0009] The cross section of the arc-shaped bearing bushing is in a C-shaped structure, a fixed wedge is arranged on the plane of the arc-shaped bearing bushing, the swing-out end of the swing wedge is in a wedge-shaped structure, a J-shaped protruding part is arranged on the side of the swing wedge abutting the first locking push block, the J-shaped protruding part is slid onto the strip-shaped first locking push block and lifts the swing-out end of the swing wedge to the fixed wedge of the arc-shaped bearing bushing, the arc-shaped bearing bushing is expanded and fixed in the shaft neck hole of the steering knuckle by the abutting of the fixed wedge and the swing wedge.

[0010] The tensioning drive device comprises a sleeve and a fixed end cover at the end of the sleeve, the sleeve is located in the installation gap, the fixed end cover is located at one end of the sleeve and extends to the rear side of the side plate, the two sides of the first locking push block are inserted into the arc-shaped bearing bushing and are in sliding connection with the arc-shaped bearing bushing, the fixed end cover is provided with a sliding groove accommodating the end of the sliding prop, the first locking push block is in gap cooperation with the inner surface of the sleeve, the other end of the sliding prop is embedded in the gap, and the sleeve is provided with a gap for the swing-out of the swing wedge.

[0011] The swing lock hook is further provided on the sliding prop, the swing lock hook is arranged at the end of the sliding prop, one side of the swing lock hook is provided with a J-shaped protruding part, a second locking push block is arranged below the sliding prop, the J-shaped protruding part of the swing lock hook is slid onto the second locking push block and lifts the swing-out end of the swing lock hook out of the arc-shaped bearing bushing installation gap, the swing-out end of the swing lock hook is provided with a positioning hook, and the positioning hook is in abutting limiting with the end face of the steering knuckle.

[0012] The swing lock hook and the swing wedge are respectively provided with a reset mechanism, the reset mechanism comprises a spring sheet and a limiting protrusion, the limiting protrusion is arranged on the side wall of the swing lock hook and the swing wedge, the swing lock hook and the swing wedge are respectively swing arranged in the mounting groove reserved on the sliding prop by means of a pin shaft, the pin shaft is fixedly connected with the side wall of the mounting groove, the pin shaft is provided with a spring sheet, the suspended end of the spring sheet is in abutting limiting with the limiting protrusion, and the swing lock hook and the swing wedge are reset by pressing the limiting protrusion by means of the spring sheet after swinging out.

[0013] The bearing step is arranged in the axle hole of the knuckle, and the outer wall of the arc-shaped bearing bush is provided with a step along which the bearing step is abutted and limited.

[0014] The outer pulling spring is further arranged in the chute, and the outer pulling spring is connected with the arc-shaped bearing bush and has a pulling force tendency of pulling the arc-shaped bearing bush to be opened.

[0015] The tension driving device further comprises a pulling mechanism, the pulling mechanism comprises a gear disc, a driving gear and a driving motor, the driving gear is arranged at the output end of the driving motor, the gear disc is abutted with the fixed end cover and has a degree of freedom of rotating relative to the fixed end cover, the middle part of the gear disc is provided with a threaded hole, the end part of the pulling shaft is threadedly connected with the gear disc, the gear disc is rotated by means of the driving motor, the pulling shaft has a degree of freedom of stretching and contracting relative to the gear disc by means of the threaded connection, the section of the pulling shaft is rectangular, and the fixed end cover is provided with a sliding groove matched with the section shape of the pulling shaft.

[0016] The anti-rotation auxiliary positioning mechanism comprises a positioning table and a pressing block, and the shock-absorbing connecting arm of the knuckle is clamped on the positioning table and fixed by means of the pressing block.

[0017] The beneficial effects of the present application are:

[0018] The connecting shaft passes through the axle hole of the knuckle, and the arc-shaped bearing bush of the connecting shaft is expanded, so that the arc-shaped bearing bush is tightly connected with the axle hole of the knuckle, thereby realizing fixed connection of the main body of the knuckle, and the anti-rotation auxiliary positioning mechanism is arranged to support the shock-absorbing connecting arm of the knuckle, so as to prevent the knuckle from rotating during processing. The axle hole of the knuckle and the shock-absorbing connecting arm are inherent structures, so that various structural forms of the knuckle can be clamped on the fixture of the present application, and only the machining program of the machine tool needs to be adjusted, thereby saving the repeated clamping time and improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present application;

[0020] Figure 2 It is a sectional view of the present application;

[0021] Figure 3 It is Figure 2 It is an enlarged schematic diagram of the A part;

[0022] In the attached diagram, 1 is the base, 2 is the side plate, 3 is the fixed plate, 4 is the arc-shaped bearing, 5 is the slide groove, 6 is the pull shaft, 7 is the swing arm, 8 is the sliding pry bar, 9 is the sliding hinge shaft, 10 is the swing wedge, 11 is the first locking push block, 12 is the fixed wedge, 13 is the sleeve, 14 is the fixed end cover, 15 is the swing lock hook, 16 is the second locking push block, 17 is the spring plate, 18 is the limiting protrusion, 19 is the step edge, 20 is the external tension spring, 21 is the gear disk, 22 is the drive gear, 23 is the drive motor, 24 is the positioning table, and 25 is the pressure block. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] Specific implementation examples Figure 1 and Figure 2 As shown, this invention is a machining clamping fixture for an automotive chassis steering knuckle, mounted on a machining table. It includes a base 1 and a side plate 2 mounted on the base 1. The base 1 and the machining table are detachably fixedly connected. The fixture also includes a connecting shaft, which is laterally mounted on the side plate 2. The journal hole of the steering knuckle is detachably mounted on the connecting shaft. The connecting shaft includes a fixed plate 3 and two sets of symmetrically arranged arc-shaped bearing bushes 4. An installation gap is provided between the arc-shaped bearing bushes 4. A tensioning drive device is provided within the installation gap. A sliding groove 5 is provided on the fixed plate 3. One end of each set of arc-shaped bearing bushes 4 is embedded in the sliding groove 5 and has the sliding freedom to expand or reduce the width of the installation gap using the sliding groove 5. An anti-rotation auxiliary positioning mechanism is also provided on the base 1.

[0025] In use, this invention is set on the machining table of a machine tool, and the cast steering knuckle blank (see...) is placed manually or by a robotic arm. Figure 1 The steering knuckle (the part shown in the dashed line) is clamped onto the connecting shaft. The blank of the steering knuckle is pre-machined with a journal hole and a shock absorber connecting arm as a reference surface. When clamped, the journal hole is inserted into the connecting shaft. Then, the shock absorber connecting arm is swung to the side of the anti-rotation auxiliary positioning mechanism and clamped by the anti-rotation auxiliary positioning mechanism. Then, the arc-shaped bearing 4 is opened and squeezed against the inner wall of the journal hole by the tensioning drive device, thereby fixing the steering knuckle. Since the steering knuckle generally has a journal hole and a shock absorber connecting arm, the clamping fixture of the present invention can be adapted to the steering knuckles of various vehicle models, reducing equipment cost.

[0026] Furthermore, such as Figure 2As shown, the tensioning driving device comprises a pull shaft 6, a swing arm 7 and a strip-shaped sliding wedge 8, the sliding wedge 8 is symmetrically arranged on both sides of the pull shaft 6, the swing arm 7 is provided with a sliding hinge shaft 9, the two ends of the sliding hinge shaft 9 are respectively inserted into the two arc-shaped bearing bushings 4, the two ends of the sliding hinge shaft 9 have the freedom of sliding with the arc-shaped bearing bushings 4 expanding or shrinking, one end of the swing arm 7 is inserted into the limiting slot arranged on the pull shaft 6 to form nested limiting, and the other end is inserted into the limiting slot arranged on the sliding wedge 8 to form nested limiting, the width of the limiting slot is greater than the width of the inserted end of the swing arm 7, and the swing wedge 10 is further arranged on the sliding wedge 8, the swing wedge 10 is lifted between the two arc-shaped bearing bushings 4 by the first locking push block 11 when the sliding wedge 8 moves, and abuts against the two arc-shaped bearing bushings 4.

[0027] The pull shaft 6 of the present application has the freedom of reciprocating sliding along its own axis, and the sliding wedge 8 is driven to the opposite movement direction of the pull shaft 6 by the swing arm 7, the limiting slot and the end of the sliding wedge 8 form nested driving cooperation, so as to realize driving cooperation, when the sliding wedge 8 slides, the swing wedge 10 is lifted and filled between the arc-shaped bearing bushings 4 by the first locking push block 11, so that the arc-shaped bearing bushings 4 are tightened.

[0028] Further, as shown in the drawings, Figure 1 The cross section of the arc-shaped bearing bushing 4 is in C-shaped structure, the fixed wedge 12 is arranged on the plane part of the arc-shaped bearing bushing 4, the swing-out end of the swing wedge 10 is in wedge-shaped structure, the swing-out end of the swing wedge 10 is lifted to the fixed wedge 12 of the arc-shaped bearing bushing 4 by the J-shaped protruding part arranged on the abutting side of the swing wedge 10 and the first locking push block 11, and the arc-shaped bearing bushing 4 is expanded and fixed in the shaft neck hole of the knuckle by the abutting of the fixed wedge 12 and the swing wedge 10.

[0029] The inclination direction of the fixed wedge 12 is matched with the wedge angle direction of the swing wedge 10, and the fixed wedge 12 is pushed and expanded by the wedge of the swing wedge 10.

[0030] Further, as shown in the drawings, Figure 1 And Figure 2As shown, the tensioning driving device comprises a sleeve 13 and a fixed end cover 14 at one end of the sleeve 13, the sleeve 13 is located in the installation gap, the fixed end cover 14 is located at one end of the sleeve 13 and extends to the rear side of the side plate 2, the first locking push block 11 is inserted into the arc-shaped bearing bush 4 at both sides and forms a sliding connection with the arc-shaped bearing bush 4, the fixed end cover 14 is provided with a sliding groove for accommodating the end of the sliding crowbar 8, the first locking push block 11 is gap-fitted with the inner surface of the sleeve 13, the other end of the sliding crowbar 8 is embedded in the gap, and the sleeve 13 is provided with a gap for the swing wedge block 10 to swing out.

[0031] The sleeve 13 cooperates with the first locking push block 11 to support the sliding crowbar 8, so that the sliding crowbar 8 can slide translationally, the sliding crowbar 8 is further provided with a swing locking hook 15, the swing locking hook 15 is arranged at the end of the sliding crowbar 8, one side of the swing locking hook 15 is provided as a J-shaped protruding part, the sliding crowbar 8 is provided below with a second locking push block 16, the J-shaped protruding part of the swing locking hook 15 slides onto the second locking push block 16 and lifts the swing-out end of the swing locking hook 15 out of the installation gap of the arc-shaped bearing bush 4, and the swing-out end of the swing locking hook 15 is provided with a positioning hook which abuts against the end face of the knuckle to limit.

[0032] When the sliding crowbar 8 slides translationally, the swing locking hook 15 is pushed up by the second locking push block 16, so that the swing locking hook 15 abuts against the end face of the knuckle to avoid the knuckle from loosening and falling off the connecting shaft, thereby playing a limiting role.

[0033] Further, as shown in Figure 2 and Figure 3 The swing locking hook 15 and the swing wedge block 10 are respectively provided with a reset mechanism, the reset mechanism comprises a spring sheet 17 and a limiting protrusion 18, the limiting protrusion 18 is arranged on the side wall of the swing locking hook 15 and the swing wedge block 10, the swing locking hook 15 and the swing wedge block 10 are swingingly arranged in the mounting groove reserved in the sliding crowbar 8 by means of a pin shaft, the pin shaft is fixedly connected with the side wall of the mounting groove, the pin shaft is provided with the spring sheet 17, the suspension end of the spring sheet 17 abuts against the limiting protrusion 18 to limit, and the swing locking hook 15 and the swing wedge block 10 are reset by pressing the limiting protrusion 18 by means of the spring sheet 17 after swinging out.

[0034] The reset mechanism is arranged on the swing locking hook 15 and the swing wedge block 10 respectively, the swing locking hook 15 and the swing wedge block 10 are pushed by the spring sheet 17, and the reset function after swinging out is realized, so that the tensioning of the connecting shaft and the limiting locking of the knuckle are released, and the unloading operation after the knuckle is processed is facilitated.

[0035] Further, the axle hole of the knuckle is provided with a bearing step, and the outer side wall of the arc-shaped bearing bush 4 is provided with a step edge 19 abutting against the bearing step for limiting. The step edge 19 is used for limiting the insertion depth of the connecting shaft of the knuckle, so as to facilitate the positioning of the machine tool.

[0036] Further, the chute 5 is further provided with an outer pulling spring 20 connected with the arc-shaped bearing bush 4 and having a pulling force tendency of pulling the arc-shaped bearing bush 4 to be opened. The outer pulling spring 20 is used for keeping the arc-shaped bearing bush 4 in an opened state, and the end of the arc-shaped bearing bush 4 is provided in an arc shape or a taper shape, so as to facilitate the insertion of the axle hole of the knuckle. Since the arc-shaped bearing bush 4 is in the opened state and tightly abuts against the inner wall of the axle hole, the swing wedge 10 directly fixes the two arc-shaped bearing bushes 4 after swinging out, so that the shock absorbing connecting arm does not deviate after being pre-clamped to the anti-rotation auxiliary positioning mechanism, and the positioning accuracy is ensured.

[0037] Further, the tensioning driving device further comprises a pulling mechanism, the pulling mechanism comprises a gear plate 21, a driving gear 22 and a driving motor 23, the driving gear 22 is arranged at the output end of the driving motor 23, the gear plate 21 abuts against the fixed end cover 14 and has a rotation freedom degree relative to the fixed end cover 14, the middle part of the gear plate 21 is provided with a threaded hole, the end of the pulling shaft 6 is provided with a bolt part in threaded connection with the gear plate 21, the gear plate 21 is rotated by the driving motor 23, the pulling shaft 6 has an extension and retraction freedom degree relative to the gear plate 21 by the threaded connection, the section of the pulling shaft 6 is rectangular, and the fixed end cover 14 is provided with a sliding groove matched with the section shape of the pulling shaft 6.

[0038] The driving motor 23 drives the pulling mechanism to operate, so as to realize the automatic operation of the tensioning and limiting of the connecting shaft, and provide a hardware basis for the subsequent mechanical hand clamping.

[0039] Further, the anti-rotation auxiliary positioning mechanism comprises a positioning table 24 and a pressing block 25, and the shock absorbing connecting arm of the knuckle is clamped on the positioning table 24 and is pressed and fixed by the pressing block 25.

[0040] The pressing block 25 is a straight pushing type pressing block or a lever type pressing block driven by a cylinder, and the shock absorbing connecting arm can be conveniently pressed and fixed.

Claims

1. A machining clamping fixture for a car chassis steering knuckle, mounted on a machining table, comprising a base (1) and a side plate (2) mounted on the base (1), wherein the base (1) and the machining table form a detachable fixed connection, the fixture further comprising a connecting shaft, wherein the connecting shaft is laterally mounted on the side plate (2), and the journal hole of the steering knuckle is detachably mounted on the connecting shaft, characterized in that: The connecting shaft comprises a fixed disc (3) and two groups of arc-shaped bearing bushings (4) symmetrically arranged left and right, the arc-shaped bearing bushings (4) are provided with a mounting gap therebetween, the mounting gap is provided with a tensioning driving device, the fixed disc (3) is provided with a sliding groove (5), one end of the two groups of arc-shaped bearing bushings (4) is embedded in the sliding groove (5) and has a sliding freedom degree of expanding or reducing the width of the mounting gap by means of the sliding groove (5), and the base (1) is further provided with an anti-rotation auxiliary positioning mechanism; The tensioning driving device comprises a pulling shaft (6), a swing arm (7) and a strip-shaped sliding crowbar (8), the swing arm (7) is provided with a sliding hinge shaft (9), the two ends of the sliding hinge shaft (9) are respectively inserted into the two arc-shaped bearing bushings (4) on the two sides, the two ends of the sliding hinge shaft (9) have a sliding freedom degree with the arc-shaped bearing bushings (4) with the expansion or reduction of the two arc-shaped bearing bushings (4), one end of the swing arm (7) is inserted into a limiting groove arranged on the pulling shaft (6) to form nested limiting, the other end is inserted into a limiting groove arranged on the sliding crowbar (8) to form nested limiting, the width of the limiting groove is greater than the width of the inserted end of the swing arm (7), and the sliding crowbar (8) is further provided with a swing wedge block (10), the swing wedge block (10) is lifted to between the two groups of arc-shaped bearing bushings (4) by means of the first locking push block (11) when the sliding crowbar (8) moves, and abuts against and limits the two arc-shaped bearing bushings (4); The cross section of the arc-shaped bearing bushing (4) is in a C-shaped structure, the fixed wedge block (12) is arranged on the plane part of the arc-shaped bearing bushing (4), the swing-out end of the swing wedge block (10) is in a wedge-shaped structure, the swing-out end of the swing wedge block (10) is lifted to the fixed wedge block (12) of the arc-shaped bearing bushing (4) by the J-shaped protruding part abutting against one side of the first locking push block (11), and the arc-shaped bearing bushing (4) is expanded and fixed in the shaft neck hole of the steering knuckle by the abutment of the fixed wedge block (12) and the swing wedge block (10); The sliding crowbar (8) is further provided with a swing lock hook (15), the swing lock hook (15) is arranged at the end of the sliding crowbar (8), one side of the swing lock hook (15) is provided as a J-shaped protruding part, a second locking push block (16) is arranged below the sliding crowbar (8), the swing-out end of the swing lock hook (15) is lifted out of the mounting gap of the arc-shaped bearing bushing (4) by the J-shaped protruding part of the swing lock hook (15) sliding onto the second locking push block (16), and the swing-out end of the swing lock hook (15) is provided with a positioning hook abutting against and limiting the end face of the steering knuckle.

2. The machining clamping fixture for an automobile chassis knuckle according to claim 1, characterized in that: The tensioning driving device comprises a sleeve (13) and a fixed end cover (14) at one end of the sleeve (13), the sleeve (13) is located in the installation gap, the fixed end cover (14) is located at one end of the sleeve (13) and extends to the rear side of the side plate (2), the first locking push block (11) is inserted into the arc-shaped bearing bush (4) at both sides and forms a sliding connection with the arc-shaped bearing bush (4), the fixed end cover (14) is provided with a sliding groove for accommodating the end of the sliding crowbar (8), the first locking push block (11) is in gap fit with the inner surface of the sleeve (13), the other end of the sliding crowbar (8) is embedded in the gap, and the sleeve (13) is provided with a gap for the swing wedge block (10) to swing out.

3. The machining clamping fixture for an automobile chassis knuckle according to claim 1, characterized in that: The swing lock hook (15) and the swing wedge block (10) are respectively provided with a reset mechanism, the reset mechanism comprises a spring sheet (17) and a limiting protrusion (18), the limiting protrusion (18) is arranged on the side wall of the swing lock hook (15) and the swing wedge block (10), the swing lock hook (15) and the swing wedge block (10) are swingingly arranged in the installation groove reserved in the sliding crowbar (8) by means of the pin shaft, the pin shaft is fixedly connected with the side wall of the installation groove, the pin shaft is provided with the spring sheet (17), the suspension end of the spring sheet (17) is abutted and limited by the limiting protrusion (18), and the swing lock hook (15) and the swing wedge block (10) are reset by pressing the limiting protrusion (18) by means of the spring sheet (17) after swinging out.

4. The machining clamping fixture for an automobile chassis knuckle according to claim 1, characterized in that: The bearing step is arranged in the journal hole of the knuckle, and the outer side wall of the arc-shaped bearing bush (4) is provided with a step edge (19) abutting and limiting the bearing step.

5. The machining clamping fixture for an automobile chassis knuckle according to claim 1, characterized in that: The outer pulling spring (20) is further arranged in the sliding groove (5), and the outer pulling spring (20) is connected with the arc-shaped bearing bush (4) and has a spring force tendency of pulling the arc-shaped bearing bush (4) to open.

6. The machining clamping fixture for an automobile chassis knuckle according to claim 2, characterized in that: The tensioning driving device further comprises a pulling mechanism, the pulling mechanism comprises a gear disc (21), a driving gear (22) and a driving motor (23), the driving gear (22) is arranged at the output end of the driving motor (23), the gear disc (21) abuts against the fixed end cover (14) and has a degree of freedom of rotating relative to the fixed end cover (14), the middle part of the gear disc (21) is provided with a threaded hole, the end of the pull shaft (6) is in threaded connection with the gear disc (21), the gear disc (21) rotates by means of the driving motor (23), the pull shaft (6) has a degree of freedom of stretching and contracting relative to the gear disc (21) by means of the threaded connection, the cross section of the pull shaft (6) is rectangular, and the fixed end cover (14) is provided with a sliding groove matched with the cross section shape of the pull shaft (6).

7. The machining clamping fixture for an automobile chassis knuckle according to claim 1, characterized by: The anti-rotation auxiliary positioning mechanism comprises a positioning table (24) and a pressing block (25), and the shock connection arm of the knuckle is clamped on the positioning table (24) and is pressed and fixed by means of the pressing block (25).

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