A differential cross shaft positioning tool

Abstract

The utility model discloses a differential cross shaft positioning tool, which relates to the field of differential cross shaft processing, including a positioning block and a floating positioning block, wherein mounting holes are provided on the four corners of the positioning block for inserting biting teeth; a central boss is provided at the center of the positioning block, and a central groove is provided, and an adjusting screw and a compression spring are placed in the central groove; the floating positioning block is sleeved on the outer periphery of the central boss, and the compression spring is pressed between the central groove and the lower end face of the floating positioning block, so that the floating positioning block floats axially relative to the positioning block; four positioning petals are evenly distributed along the circumference of the floating positioning block, and avoidance grooves are left between adjacent positioning petals for corresponding passage of the four protrusions of the positioning block, and a V-shaped groove is provided in the middle of each positioning petal, and positioning screws are provided on both sides of each V-shaped groove for contacting and positioning the corresponding bosses on the differential cross shaft blank. The utility model solves the problem of quick, stable and accurate one-time positioning of the differential cross shaft blank when the robot automatically loads and unloads materials.

Description

Technical Field

[0001] The utility model relates to the field of differential cross shaft processing, in particular to a differential cross shaft positioning tool. Background Art

[0002] In the prior art, the differential cross shaft adopts Figure 1 , 2 The positioning tool shown in the figure comprises a sleeve (2'), a centering block (3') is slidably arranged at the center of the sleeve through a spring (7'), a limiting groove is arranged on the side wall of the centering block, a limiting bolt (4') passes through the sleeve and then extends into the limiting groove, a positioning block (5') is fixed to the top of the sleeve by a fixing screw (6'), and an oil cylinder (8') is arranged at the bottom of the sleeve.

[0003] During machining, the operator directly uses the middle hole of the differential cross shaft blank (1') to center the contour, then manually rotates and controls the differential cross shaft to visually check that one of the journals is close to the scale on the turret, then pushes the oil cylinder to press the workpiece by pressing the button, and manually presses the start button to complete the turning process according to the set program.

[0004] Since the centering is based solely on the contour of the middle hole of the differential cross-shaft blank without restricting the freedom of rotation, there is a potential risk that the workpiece will rotate along the center line of the centering when the cylinder presses the workpiece, causing the four journals to deflect. Although manual loading and unloading processing is not a problem, automatic loading and unloading processing cannot be achieved. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a differential cross shaft positioning tool to solve the problem of quick, stable and accurate one-time positioning of the differential cross shaft blank when the robot automatically loads and unloads materials.

[0006] The purpose of the utility model is to achieve the following technical solution: the differential cross shaft positioning tool comprises a positioning block and a floating positioning block,

[0007] The four corners of the positioning block are provided with protrusions, and each protrusion is provided with a mounting hole for inserting a biting tooth, and the biting tooth top protrudes from the upper plane of the positioning block, and is used for biting and positioning the end face of the differential cross shaft blank, and the upper end face of the differential cross shaft blank is evenly distributed with four bosses along the circumference;

[0008] A central boss is arranged at the center of the positioning block, a central groove is arranged on the central boss, the bottom of the central groove is connected with a central channel arranged along the axial direction of the positioning block, an adjusting screw and a compression spring are arranged in the central groove, one end of the adjusting screw is inserted into the central channel for fixing, and a floating screw is fixedly arranged at the other end of the adjusting screw along the axial direction;

[0009] The inner circle of the floating positioning block is sleeved on the outer periphery of the central convex column, and the compression spring is pressed between the central groove and the lower end surface of the floating positioning block, so that the floating positioning block floats axially relative to the positioning block, and the outer edge of the floating screw is stuck on the floating screw hole opened in the center of the floating positioning block, thereby limiting the travel of the floating positioning block;

[0010] There are four positioning petals evenly distributed along the circumference of the floating positioning block, and avoidance grooves are left between adjacent positioning petals for the four protrusions of the positioning block to pass through accordingly. A V-shaped groove is opened in the middle of each positioning petal, and positioning screws are passed on both sides of each V-shaped groove for contacting and positioning the corresponding bosses on the differential cross shaft blank.

[0011] As a further technical solution, a gasket is arranged in the mounting hole for adjusting the relative height of the biting tooth and the positioning block so that the tooth top of the biting tooth protrudes 0.2 to 0.3 mm from the upper plane of the positioning block. A locking side hole connected to the mounting hole is radially opened on the outer wall of the positioning block for installing a set screw A, and the set screw A cooperates with the locking groove opened on the biting tooth to tighten it.

[0012] As a further technical solution, a positioning screw hole is opened on the positioning flap in a direction perpendicular to the end face of the V-shaped groove for inserting a positioning screw, and the end of the positioning screw is provided with a steel ball, and the outer dome of the steel ball is 0.8 mm away from the inner surface of the V-shaped groove; a fastening screw hole is opened on the positioning flap in a direction perpendicular to the positioning screw hole for installing a fastening screw C, and locking the positioning screw on the floating positioning block.

[0013] As a further technical solution, a sealing ring is installed on the inner circle of the floating positioning block to slide and seal relative to the central protrusion of the positioning block.

[0014] As a further technical solution, a positioning pin hole is opened on the central boss of the positioning block, a corresponding positioning hole is opened on the floating positioning block, a floating positioning block cover is installed on the floating positioning block, and the positioning pin passes through the floating positioning block cover and the positioning hole in sequence and extends into the positioning pin hole.

[0015] As a further technical solution, the top end of the positioning pin is provided with an opening, and an extremely low head set screw is installed in the opening and passes through the floating positioning block cover plate and the floating positioning block in sequence.

[0016] As a further technical solution, a floating screw mounting hole for mounting a floating screw is provided in the center of the adjusting screw, and a locking hole connected to the floating screw mounting hole is radially provided on the outer wall of the adjusting screw for mounting a set screw to lock the floating screw with the adjusting screw.

[0017] As a further technical solution, a fixed side hole connected to the central channel is radially opened on the outer wall of the positioning block for installing a set screw D to lock the adjusting screw and the positioning block.

[0018] As a further technical solution, the floating stroke of the floating positioning block relative to the upper end surface of the positioning block is 3.2 to 4.5 mm.

[0019] The beneficial effects of the utility model are:

[0020] 1. Four symmetrically evenly distributed bosses are added at a 45° rotation from the center line of the four journals on one side of the middle plane of the differential cross shaft blank to guide the initial positioning. When the blank is placed in the tooling, the V-shaped groove of the floating positioning block is automatically pre-positioned, so that the workpiece is smoothly positioned on the tooling and pressed, solving the problem of fast, stable and accurate one-time positioning of the differential cross shaft blank when the robot automatically loads and unloads materials, and realizing a qualitative leap from manual processing to robot automatic processing;

[0021] 2. The teeth are respectively embedded in the middle plane (end face) of the differential cross shaft blank, which limits the rotational freedom of the workpiece relative to the positioning center during the processing;

[0022] 3. A positioning screw is arranged in the V-shaped groove, which can contact with the four bosses of the differential cross shaft blank and automatically center;

[0023] 4. A positioning pin is set between the positioning block and the floating positioning block to prevent relative rotation during floating and ensure positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the prior art.

[0025] Figure 2 It is a schematic diagram of the top view structure of the prior art.

[0026] Figure 3 It is a schematic diagram of the main structure of the utility model.

[0027] Figure 4 It is a three-dimensional structural schematic diagram of the utility model.

[0028] Figure 5 for Figure 3 AA section view.

[0029] Figure 6 for Figure 3 BB cross-sectional view.

[0030] Figure 7 for Figure 3 CC cross-sectional view.

[0031] Figure 8 This is a schematic diagram of the main structure of the positioning block in the utility model.

[0032] Fig. 9 It is a three-dimensional structural schematic diagram of the positioning block in the utility model.

[0033] Fig.10 for Figure 8 DD cross-sectional view.

[0034] Fig.11 for Figure 8 EE cross-sectional view.

[0035] Fig.12 It is a schematic diagram of the main structure of the floating positioning block in the utility model.

[0036] Fig.13 It is a rear structural schematic diagram of the floating positioning block in the utility model.

[0037] Fig.14 for Fig.12 FF cross-sectional view.

[0038] Fig.15 for Fig.12 GG cross-sectional view.

[0039] Fig.16 It is a three-dimensional structural schematic diagram of the floating positioning block in the utility model.

[0040] Fig.17 It is a schematic diagram of the structure of clenching teeth in the utility model.

[0041] Fig.18 It is a structural schematic diagram of the adjusting screw in the utility model.

[0042] Fig.19 It is a structural schematic diagram of the differential cross shaft blank in the utility model.

[0043] Fig. 20 for Fig.19 HH cross-sectional view.

[0044] Fig.21 It is a structural schematic diagram of the utility model and the differential cross shaft blank when being positioned.

[0045] Description of reference numerals: blank 1', sleeve 2', centering block 3', limit bolt 4', positioning block 5', fixing screw 6', spring 7', oil cylinder 8';

[0046] Positioning block 1, protrusion 1-1, mounting hole 1-2, center boss 1-3, positioning pin hole 1-4, center groove 1-5, center channel 1-6, fixed side hole 1-7, locking side hole 1-8, set screw A2, biting teeth 3, locking groove 3-1, floating positioning block 4, positioning flap 4-1, V-shaped groove 4-2, positioning screw hole 4-3, fastening screw hole 4-4, avoidance groove 4-5, inner circle 4-6, floating screw hole 4-7, positioning hole 4-8, floating positioning block cover 5, fastening screw B6, floating screw 7, compression spring 8, adjusting screw 9, floating screw mounting hole 9-1, locking hole 9-2, gasket 10, sealing ring 11, positioning screw 12, fastening screw C13, extremely low head fastening screw 14, positioning pin 15, fastening screw D16, differential cross shaft blank 100, boss 101. DETAILED DESCRIPTION

[0047] The utility model will be described in detail below with reference to the accompanying drawings:

[0048] Example: As shown in the attached Figures 3 to 21 As shown, the differential cross shaft positioning tool comprises a positioning block 1, a protrusion 1-1, a mounting hole 1-2, a center boss 1-3, a positioning pin hole 1-4, a center groove 1-5, a center channel 1-6, a fixed side hole 1-7, a locking side hole 1-8, a set screw A2, a biting tooth 3, a locking groove 3-1, a floating positioning block 4, a positioning flap 4-1, a V-shaped groove 4-2, a positioning screw hole 4-3, a locking screw hole 4-4, and an avoidance groove 4 -5, inner circle 4-6, floating screw hole 4-7, positioning hole 4-8, floating positioning block cover 5, set screw B6, floating screw 7, compression spring 8, adjusting screw 9, floating screw mounting hole 9-1, locking hole 9-2, gasket 10, sealing ring 11, positioning screw 12, set screw C13, extremely low head set screw 14, positioning pin 15, set screw D16, differential cross shaft blank 100 and boss 101.

[0049] Reference Figure 8 , 9 A protrusion 1-1 is provided at each of the four corners of the positioning block 1, and a mounting hole 1-2 is provided through each protrusion 1-1 in the axial direction for receiving the biting teeth 3. Preferably, as Figure 5 As shown, a gasket 10 is arranged in the mounting hole 1-2, which can adjust the relative height between the biting teeth 3 and the positioning block 1, so that the top of the biting teeth 3 protrudes 0.2 to 0.3 mm from the upper plane of the positioning block 1. Figure 5 , 9 As shown in FIG. 11 , a locking side hole 1-8 is radially provided on the outer wall of the positioning block 1 and communicated with the mounting hole 1-2 for installing a set screw A2. The set screw A2 cooperates with the locking groove 3-1 provided on the biting teeth 3 to fasten the set screw A2 to the positioning block 1. Fig.19 ,20 As shown, the upper end surface of the differential cross shaft blank 100 has four bosses 101 evenly distributed along the circumference. During processing, the biting teeth 3 are used to bit and position the end surface of the differential cross shaft blank 100.

[0050] like Figure 8 , 9 As shown, a center boss 1-3 is provided at the center of the positioning block 1, a center groove 1-5 is provided on the center boss 1-3, a center channel 1-6 is provided along the axial direction of the positioning block 1, and the bottom of the center groove 1-5 is connected to the center channel 1-6. Preferably, a positioning pin hole 1-4 is provided on the center boss 1-3 of the positioning block 1, a positioning hole 4-8 is provided on the floating positioning block 4 correspondingly, a floating positioning block cover plate 5 is installed on the floating positioning block 4, and the positioning pin 15 passes through the floating positioning block cover plate 5 and the positioning hole 4-8 in sequence and extends into the positioning pin hole 1-4. Figure 7 As shown, the top of the positioning pin 15 is provided with an opening, and the extremely low head set screw 14 is installed in the opening and passes through the floating positioning block cover plate 5 and the floating positioning block 4 in sequence.

[0051] like Figure 5 As shown, an adjusting screw 9 and a compression spring 8 are inserted into the central groove 1-5, one end of the adjusting screw 9 is inserted into the central channel 1-6 for fixing, and the other end of the adjusting screw 9 is fixedly mounted with a floating screw 7 along the axial direction. Fig.18 As shown, a floating screw mounting hole 9-1 for mounting the floating screw 7 is provided in the center of the adjusting screw 9, and a locking hole 9-2 is provided radially on the outer wall of the adjusting screw 9. The locking hole 9-2 is connected to the floating screw mounting hole 9-1 and is used to mount the set screw 6 to lock the floating screw 7 and the adjusting screw 9. Figure 7 , 10 A fixed side hole 1-7 is radially opened on the outer wall of the positioning block 1. The fixed side hole 1-7 is connected to the central channel 1-6 and is used to install a set screw D16, thereby locking the adjusting screw 9 and the positioning block 1.

[0052] Reference Figure 5 The inner circle 4-6 of the floating positioning block 4 is sleeved on the outer periphery of the central boss 1-3, and the compression spring 8 is pressed between the central groove 1-5 and the lower end surface of the floating positioning block 4, so that the floating positioning block 4 floats axially relative to the positioning block 1, and the outer edge of the floating screw 7 is stuck on the floating screw hole 4-7 opened in the center of the floating positioning block 4, thereby limiting the stroke of the floating positioning block 4.

[0053] like Figures 12 to 16As shown, four positioning petals 4-1 are evenly distributed along the circumference of the floating positioning block 4, and avoidance grooves 4-5 are left between adjacent positioning petals 4-1 for the four protrusions 1-1 on the positioning block 1 to pass through accordingly. A V-shaped groove 4-2 is opened in the middle of each positioning petal 4-1, and positioning screws 12 are penetrated on both sides of each V-shaped groove 4-2 to contact and position the corresponding boss 101 on the differential cross shaft blank 100. Preferably, as Figure 6 , 15 As shown, a positioning screw hole 4-3 is provided on the upper edge of the positioning flap 4-1 in a direction perpendicular to the end face of the V-shaped groove 4-2, which is used to insert the positioning screw 12. The end of the positioning screw 12 has a steel ball, and the outer dome of the steel ball is 0.8mm away from the inner side of the V-shaped groove 4-2. A tightening screw hole 4-4 is provided on the upper edge of the positioning flap 4-1 in a direction perpendicular to the positioning screw hole 4-3, which is used to install the tightening screw C13 to lock the positioning screw 12 on the floating positioning block 4. Furthermore, a sealing ring 11 is installed on the inner circle 4-6 of the floating positioning block 4, which is slidably sealed relative to the central boss 1-3 of the positioning block 1. The floating stroke of the floating positioning block 4 relative to the upper end face of the positioning block 1 is 3.2 to 4.5mm.

[0054] The working process of this utility model:

[0055] (1) Positioning tooling design, installation and commissioning

[0056] like Figure 3 , 4As shown in Figure 5, the biting teeth 3 are placed in the four mounting holes 1-2 around the positioning block 1. The relative height of the biting teeth 3 and the positioning block 1 is adjusted by placing a brass gasket 10 at the bottom of the mounting hole 1-2 until the tooth top protrudes 0.2-0.3mm from the positioning upper plane of the positioning block 1, which is the best. Then use the hexagon socket set screw A2 to pass through the locking side hole 1-8 to fasten the biting teeth 3 to the positioning block 1. Screw the positioning screw 12 into the floating positioning block 4 until the outer dome of the small steel ball protruding from the positioning screw 12 is 0.8mm away from the inner side of the V-shaped groove 4-2, which is the best. Use the hexagon socket set screw C13 to fasten the positioning screw 12 to the floating positioning block 4. The adjusting screw 9 is screwed into the center channel 1-6 of the positioning block 1, the compression spring 8 is placed in the center groove 1-5 of the positioning block 1, the O-ring 11 is placed in the oil seal groove of the floating positioning block 4, the inner circle 4-6 of the floating positioning block 4 is inserted into the outer circle of the center boss 1-3 of the positioning block 1, and the two positioning pins 15 are inserted along the two positioning holes 4-8 on the floating positioning block 4 until the two positioning pin holes 1-4 on the positioning block 1 bottom, and these two positioning pins 15 can effectively prevent the floating positioning block 4 from rotating relative to the positioning block 1. Then, screw the floating screw 7 (using an ultra-low head screw) into the adjusting screw 9 to float and fix the floating positioning block 4 on the positioning block 1. It is best if the bottom of the inner circle 4-6 of the floating positioning block 4 can float 3.2-4.5mm relative to the upper plane of the positioning block 1. Tighten the hexagon socket set screw B6 through the reserved hole (locking hole 9-2) on the side of the adjusting screw 9 to fasten the floating screw 7 and the adjusting screw 9. Then, tighten the hexagon socket set screw D16 through the reserved hole (fixed side hole 1-7) on the side of the positioning block 1 to fasten the adjusting screw 9 and the positioning block 1. Fasten the floating positioning block cover 5 to the floating positioning block 4 with the ultra-low head hexagon socket set screw 14.

[0057] (2) Introduction to the installation of positioning tooling on the hydraulic automatic indexing chuck of the lathe

[0058] The hydraulic automatic chuck is fastened to the flange of the lathe with hexagon socket head screws, and the positioning block assembly is fastened to the hydraulic automatic chuck with bolts. A gasket is used between the two to adjust the center height of the workpiece. The inner hole of the clamping block of the clamping block assembly is put into a disc spring and fastened to the hydraulic automatic chuck through a shoulder screw. The hexagon socket head screw can prevent the shoulder screw from loosening during the clamping process. The feeding gap is controlled at about 4.6mm.

[0059] (3) Operation of positioning tooling in automatic processing

[0060] The robot automatically grabs the material from the silo Fig.19 , 20The differential cross shaft blank 100 shown in the figure is moved downwardly on the positioning fixture with one side having four bosses 101, and the robot claws are released, and the differential cross shaft blank 100 falls into the four V-shaped grooves 4-2 of the floating positioning block 4, and each V-shaped groove 4-2 is provided with a positioning screw 12 on the inner side surface, and the outer sides of the inclined surfaces of the four bosses 101 are respectively in contact with the eight positioning screws 12 on the inner sides of the four V-shaped grooves 4-2 and are automatically centered, and the floating positioning block 4 lifts the differential cross shaft blank 100 with the help of the force of the compression spring 8, and when the car When the clamping block assembly of the bed moves down and clamps, the floating positioning block 4 falls steadily along the guiding action of the center boss 1-3 and two positioning pins 15 of the positioning block 1, as well as the positive clamping force and the spring reaction force, until the middle plane of the differential cross shaft blank 100 contacts the upper plane of the positioning block 1, ensuring that the center line of the differential cross shaft journal coincides with the rotation center line of the lathe spindle. At the same time, the four biting teeth 3 are respectively embedded in the middle plane of the differential cross shaft blank 100, limiting the rotational freedom of the workpiece relative to the positioning center during processing. The clamping block moves into place and automatically touches the lathe to enter the program processing mode. After processing, the clamping block returns, the robot picks up the material and puts the next workpiece in the positioning fixture at the same time. At this point, a robot automatically loads and unloads the differential cross shaft blank quickly, smoothly, and accurately, and completes a single cycle of one-time positioning processing.

[0061] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A differential cross shaft positioning tool, characterized in that: It comprises a positioning block (1) and a floating positioning block (4), The four corners of the positioning block (1) are provided with protrusions (1-1), and each protrusion (1-1) is provided with a mounting hole (1-2) for receiving a biting tooth (3), and the tooth top of the biting tooth (3) protrudes from the upper plane of the positioning block (1) and is used for biting and positioning the end face of the differential cross shaft blank (100), and the upper end face of the differential cross shaft blank (100) is evenly distributed with four bosses (101) along the circumference; A central boss (1-3) is arranged at the center of the positioning block (1), a central groove (1-5) is provided on the central boss (1-3), the bottom of the central groove (1-5) is communicated with a central channel (1-6) provided along the axial direction of the positioning block (1), an adjusting screw (9) and a compression spring (8) are inserted into the central groove (1-5), one end of the adjusting screw (9) extends into the central channel (1-6) for fixing, and a floating screw (7) is fixedly mounted on the other end of the adjusting screw (9) along the axial direction; The inner circle (4-6) of the floating positioning block (4) is sleeved on the outer circumference of the central protruding column (1-3), and the compression spring (8) is pressed between the central groove (1-5) and the lower end surface of the floating positioning block (4), so that the floating positioning block (4) floats axially relative to the positioning block (1), and the outer edge of the floating screw (7) is clamped on the floating screw hole (4-7) opened in the center of the floating positioning block (4), thereby limiting the travel of the floating positioning block (4); Four positioning petals (4-1) are evenly distributed along the circumference of the floating positioning block (4), and avoidance grooves (4-5) are reserved between adjacent positioning petals (4-1) for corresponding passage of four protrusions (1-1) of the positioning block (1), and a V-shaped groove (4-2) is provided in the middle of each positioning petal (4-1), and positioning screws (12) are provided on both sides of each V-shaped groove (4-2) for contacting and positioning corresponding bosses (101) on a differential cross shaft blank (100).

2. The differential cross shaft positioning tool according to claim 1, characterized in that: A gasket (10) is arranged in the mounting hole (1-2) for adjusting the relative height between the biting teeth (3) and the positioning block (1) so that the tooth top of the biting teeth (3) protrudes 0.2 to 0.3 mm from the upper plane of the positioning block (1). A locking side hole (1-8) connected to the mounting hole (1-2) is radially arranged on the outer wall of the positioning block (1) for installing a set screw A (2). The set screw A (2) cooperates with the locking groove (3-1) arranged on the biting teeth (3) to tighten it.

3. The differential cross shaft positioning tool according to claim 1, characterized in that: The positioning flap (4-1) is provided with a positioning screw hole (4-3) in a direction perpendicular to the end surface of the V-shaped groove (4-2) for inserting a positioning screw (12). The end of the positioning screw (12) is provided with a steel ball, and the outer dome of the steel ball is 0.8 mm away from the inner surface of the V-shaped groove (4-2); the positioning flap (4-1) is provided with a fixing screw hole (4-4) in a direction perpendicular to the positioning screw hole (4-3) for installing a fixing screw C (13) to lock the positioning screw (12) on the floating positioning block (4).

4. The differential cross shaft positioning tool according to claim 1, characterized in that: A sealing ring (11) is installed on the inner circle (4-6) of the floating positioning block (4) to slide and seal relative to the central protruding column (1-3) of the positioning block (1).

5. The differential cross shaft positioning tool according to claim 1, characterized in that: A positioning pin hole (1-4) is provided on the central boss (1-3) of the positioning block (1), a positioning hole (4-8) is correspondingly provided on the floating positioning block (4), a floating positioning block cover plate (5) is installed on the floating positioning block (4), and a positioning pin (15) passes through the floating positioning block cover plate (5) and the positioning hole (4-8) in sequence and extends into the positioning pin hole (1-4).

6. The differential cross shaft positioning tool according to claim 5, characterized in that: The top end of the positioning pin (15) is provided with an opening, and the extremely low head set screw (14) is installed in the opening and passes through the floating positioning block cover plate (5) and the floating positioning block (4) in sequence.

7. The differential cross shaft positioning tool according to claim 1, characterized in that: A floating screw mounting hole (9-1) for mounting a floating screw (7) is provided at the center of the adjusting screw (9), and a locking hole (9-2) connected to the floating screw mounting hole (9-1) is provided radially on the outer wall of the adjusting screw (9) for mounting a set screw (6) to lock the floating screw (7) and the adjusting screw (9).

8. The differential cross shaft positioning tool according to claim 1, characterized in that: A fixed side hole (1-7) is radially provided on the outer wall of the positioning block (1) and is communicated with the central channel (1-6) and is used for installing a set screw D (16) to lock the adjusting screw (9) and the positioning block (1).

9. The differential cross shaft positioning tool according to claim 1, characterized in that: The floating stroke of the floating positioning block (4) relative to the upper end surface of the positioning block (1) is 3.2 to 4.5 mm.

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