A rear suspension shaft and a special fixture for drilling a rear suspension shaft

Abstract

The present application relates to the technical field of rear suspension mandrel, and particularly relates to a rear suspension mandrel and a special clamp for drilling the rear suspension mandrel, the rear suspension mandrel comprising a mandrel body in the shape of a stepped shaft; a fixed part provided at the bottom end of the mandrel body and integrally formed with the mandrel body; a protruding part integrally formed around the outside of the fixed part and in the shape of a ring with equal intervals, and a fixing hole provided through the protruding part; and a mounting cavity provided through the mandrel body, and a locking groove provided on the inner wall of the mounting cavity; when the mandrel body is inserted into the positioning tube, the wrapping type positioning provided by the inner wall of the mandrel body firstly restricts most of the degrees of freedom of the mandrel, and lays a good foundation for initial positioning; when the drilling equipment is placed on the supporting assembly, the linkage mechanism triggers the locking mechanism to rigidly lock the mandrel body, and this dynamic locking mechanism is automatically completed at the beginning of the machining, without additional manual intervention, so that the operation process is simplified and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rear suspension mandrel, in particular to a rear suspension mandrel and a special clamp for drilling the rear suspension mandrel. BACKGROUND

[0002] In the existing mechanical processing field, the rear suspension mandrel is widely used in various mechanical equipment as a connecting and supporting part. The processing of the rear suspension mandrel, especially the hole processing thereon, is an indispensable link in the production process.

[0003] A Chinese patent application with the authorized announcement number CN209550632U discloses a lathe tooling for automobile rear wheel mandrel, which comprises a base plate fixed on a three-jaw chuck, a positioning bracket for clamping a workpiece is fixed on the base plate, and a counterweight is also fixed on the base plate, a center point for installing the workpiece is arranged in the center of the base plate, and the center point is located between the counterweight and the positioning bracket; at least two mounting holes for fixing the counterweight are arranged on the base plate, and the mounting holes are arranged on the periphery of the center point; the positioning bracket comprises a clamp for fixing the workpiece.

[0004] As in the above application, the existing mandrel lathe tooling mainly adopts a general drilling machine combined with a clamping device, and the mandrel is clamped and fixed on the drilling machine for use through the clamping device. However, the universal design of the standard clamp often leads to inaccurate positioning of the specific type of rear suspension mandrel, which affects the positional accuracy of drilling. In addition, during the drilling process, the rear suspension mandrel is prone to slight displacement due to the cutting force, which affects the shape and size accuracy of the hole. SUMMARY

[0005] In order to solve the above problems, the present application provides a rear suspension mandrel and a special clamp for drilling the rear suspension mandrel.

[0006] The present application adopts the following technical scheme, a rear suspension mandrel, comprising:

[0007] a mandrel body in the form of a stepped shaft;

[0008] a fixed part arranged at the bottom end of the mandrel body and integrally formed with the mandrel body;

[0009] a protruding part integrally formed on the outer side of the fixed part, in the form of a ring and evenly distributed, and a fixing hole is arranged through the protruding part;

[0010] an installation cavity arranged through the mandrel body, and a locking groove is arranged on the inner wall of the installation cavity.

[0011] As a further description of the above technical scheme, an arc-shaped bevel is arranged at the opening of the inner wall top end of the mandrel body and connected with the installation cavity.

[0012] The utility model relates to a special fixture for drilling rear suspension axle core, which is used for clamping and positioning the rear suspension axle core, comprising a processing table and a positioning tube, a circular hole is formed on the upper surface of the processing table, the positioning tube is welded and fixed in the circular hole, a fixed tube is fixed on the inner bottom plate of the positioning tube, a driving rod is inserted into the fixed tube, and a locking mechanism is arranged at the top end of the fixed tube.

[0013] A supporting assembly is arranged between the two adjacent positioning tubes on the processing table, a linkage mechanism is arranged on the supporting assembly, and the linkage mechanism is in transmission connection with the locking mechanism.

[0014] As a further description of the above technical solution: the processing table is in a strip shape, a plurality of circular holes are arranged, and the circular holes are equidistantly arranged on the processing table along the length direction of the processing table.

[0015] As a further description of the above technical solution: the top end of the driving rod extends to the outside through the top end of the fixed tube, and the bottom end of the driving rod extends to the outside through the positioning tube and is fixed with a protruding seat.

[0016] The locking mechanism comprises a sliding groove, a wedge-shaped seat and a wedge-shaped block, the sliding groove is formed on the upper surface of the fixed tube, a plurality of sliding grooves are formed, the sliding grooves are annularly and equiangularly distributed around the outside of the driving rod, the lower surface of the wedge-shaped seat is welded with a sliding block, the sliding block is in sliding connection with the sliding groove, a return spring is welded on one side wall of the sliding block, the wedge-shaped block is welded and fixed on the outer wall of the driving rod, and a locking block is arranged on the outer wall of the wedge-shaped seat.

[0017] As a further description of the above technical solution: the supporting assembly comprises a base fixed on the processing table, a supporting tube is welded at the center of the upper surface of the base, a supporting plate is vertically welded at the top end of the supporting tube, and a rectangular groove is formed at the center of the upper surface of the supporting plate.

[0018] As a further description of the above technical solution: the linkage mechanism comprises a supporting plate and a linkage rod inserted into the supporting tube, the top end of the linkage rod extends into the rectangular groove through the supporting plate, the bottom end of the linkage rod extends to the outside through the processing table, a pressure-bearing block is welded and fixed at the top end of the linkage rod, a limiting disc is welded below the linkage rod on the outer wall, a tension spring is sleeved between the limiting disc and the processing table on the linkage rod, the bottom end of the tension spring is welded and fixed with the limiting disc, and the top end of the tension spring is welded and fixed with the lower surface of the processing table.

[0019] As a further description of the above technical scheme: two connecting arms are symmetrically arranged at the center of the two side walls of the support plate, the support plate is rotationally connected between the two connecting arms through a connecting shaft, the top end of each of the two connecting arms is welded and fixed with the machining table, and a rectangular limiting frame is welded at the corner of the upper surface of the support plate.

[0020] As a further description of the above technical scheme: the positioning pipe is in the shape of a stepped shaft, the outer diameter of the upper portion of the positioning pipe is larger than that of the lower portion, and a plurality of opening grooves are arranged on the outer wall of the upper portion of the positioning pipe and are annularly and equidistantly distributed around the outer side of the positioning pipe.

[0021] As a further description of the above technical scheme: a plurality of wedge-shaped seats are arranged, and the plurality of wedge-shaped seats are annularly and equidistantly distributed around the outer side of the driving rod, and an inclined surface for cooperating with the wedge-shaped block is arranged on the inner wall of the upper portion of the wedge-shaped seat.

[0022] Beneficial effects:

[0023] The special fixture for drilling the rear suspension shaft provided by the present application can effectively avoid the risk of slight displacement or vibration of the shaft caused by cutting resistance in the traditional clamping mode. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further explained in combination with the drawings and embodiments:

[0025] Figure 1 A structure diagram of the rear suspension shaft provided by the present application is provided.

[0026] Figure 2 A sectional view of the rear suspension shaft provided by the present application is provided.

[0027] Figure 3 A structure diagram of the special fixture for drilling the rear suspension shaft provided by the present application is provided.

[0028] Figure 4 A split structure diagram of the special fixture for drilling the rear suspension shaft provided by the present application is provided.

[0029] Figure 5 A sectional view of the positioning pipe provided by the present application is provided.

[0030] Figure 6A structure schematic view of the positioning tube provided by the embodiment of the present application is shown in the figure;

[0031] Figure 7 A structure schematic view of the locking mechanism provided by the embodiment of the present application is shown in the figure;

[0032] Figure 8 A cross-sectional schematic view of the locking mechanism provided by the embodiment of the present application is shown in the figure;

[0033] Figure 9 A structure schematic view of the linkage mechanism provided by the embodiment of the present application is shown in the figure;

[0034] Figure 10 A structure schematic view of the supporting assembly provided by the embodiment of the present application is shown in the figure;

[0035] Figure 11 A cross-sectional schematic view of the supporting assembly provided by the embodiment of the present application is shown in the figure.

[0036] The figure shows the following: 1, mandrel body; 11, mounting cavity; 12, arc-shaped groove; 13, locking groove; 2, fixed part; 3, protruding part; 4, processing table; 41, circular hole; 5, positioning tube; 501, opening groove; 51, fixed tube; 52, driving rod; 521, protruding seat; 53, locking mechanism; 541, sliding groove; 542, wedge-shaped seat; 543, locking block; 544, sliding block; 545, return spring; 546, wedge-shaped block; 547, bevel surface; 6, supporting assembly; 61, base; 62, supporting tube; 63, supporting plate; 71, rectangular slot; 72, pressure-bearing block; 73, linkage rod; 74, limiting disc; 75, tension spring; 81, connecting arm; 82, connecting shaft; 83, supporting plate; 84, rectangular limiting frame. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application is further described below in combination with specific figures. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0038] Embodiment 1

[0039] Please refer to Figures 1-2 The present application provides a technical solution: a rear suspension mandrel, comprising:

[0040] The mandrel body 1 is in the form of a stepped shaft;

[0041] The fixed part 2 is arranged at the bottom end of the mandrel body 1 and is integrally formed with the mandrel body 1;

[0042] The protruding part 3 is integrally formed on the outer side of the fixed part 2 and is in the form of a ring that is distributed at equal intervals. The fixed hole is arranged through the protruding part 3.

[0043] The mounting cavity 11 is provided through the mandrel body 1, and a locking groove 13 is provided on the inner wall of the mounting cavity 11.

[0044] An arc-shaped groove 12 connected with the mounting cavity 11 is provided at the opening of the top end of the inner wall of the mandrel body 1.

[0045] Specifically, the arc-shaped groove 12 in communication with the mounting cavity 11 is provided at the opening of the top end of the inner wall of the mandrel body 1, which can play a guiding role during assembly.

[0046] In this embodiment, in order to improve the positioning accuracy and stability of the mandrel body 1 during processing, a locking groove 13 is specially provided on the inner wall of the mounting cavity 11 of the mandrel body 1. The design purpose of the locking groove 13 is to closely cooperate with the special rear suspension mandrel hole special fixture to realize accurate positioning and reliable locking of the mandrel body 1. This structural innovation effectively overcomes the inherent defects of the traditional fixing method, i.e., directly clamping the outer wall surface of the mandrel by using a standard clamp. The traditional clamping method is prone to inaccurate positioning, and it is difficult to completely suppress the possible slight displacement of the mandrel body 1 during processing, especially when bearing cutting force. The accumulation of such slight displacement will affect the shape accuracy of the final processed hole, such as roundness, straightness, and key dimension tolerance, which is difficult to meet the requirements of high-precision processing. However, the cooperation of the locking groove 13 and the clamp fundamentally solves the above problems and ensures the stability of the processing process and the accuracy of the results.

[0047] Embodiment 2

[0048] Please refer to Figures 1-11 The embodiment of the present application provides a technical scheme: a rear suspension mandrel hole special fixture for clamping and positioning a rear suspension mandrel, comprising a processing table 4 and a positioning pipe 5. A circular hole 41 is provided on the upper surface of the processing table 4, and the positioning pipe 5 is welded and fixed in the circular hole 41. A fixed pipe 51 is fixed on the inner bottom plate of the positioning pipe 5, a driving rod 52 is inserted into the fixed pipe 51, and a locking mechanism 53 is provided at the top end of the fixed pipe 51.

[0049] A supporting assembly 6 is provided between the adjacent two positioning pipes 5 on the processing table 4, and a linkage mechanism is provided on the supporting assembly 6 and is in transmission connection with the locking mechanism 53. When the hole opening equipment is placed on the supporting assembly 6 to perform hole opening processing on the rear suspension mandrel placed in the positioning pipe 5, the linkage mechanism synchronously drives the locking mechanism 53 to lock and fix the rear suspension mandrel in the positioning pipe 5.

[0050] The processing table 4 is in a strip shape, and a plurality of circular holes 41 are provided. The plurality of circular holes 41 are provided on the processing table 4 at equal intervals along the length direction of the processing table 4.

[0051] The top end of the driving rod 52 extends to the outside through the top end of the fixing tube 51, and the bottom end of the driving rod 52 extends to the outside through the positioning tube 5 and is fixed with a protruding seat 521;

[0052] The locking mechanism 53 comprises a sliding groove 541, a wedge-shaped seat 542 and a wedge-shaped block 546. The sliding groove 541 is arranged on the upper surface of the fixing tube 51, and a plurality of sliding grooves 541 are arranged in a ring shape and are distributed at equal angles around the outside of the driving rod 52. The lower surface of the wedge-shaped seat 542 is welded with a sliding block 544, the sliding block 544 is in sliding connection with the sliding groove 541, one side wall of the sliding block 544 is welded with a return spring 545, and the wedge-shaped block 546 is welded and fixed on the outer wall of the driving rod 52. The outer wall of the wedge-shaped seat 542 is provided with a locking block 543.

[0053] Specifically, the working mode of the special clamp for drilling the rear suspension shaft is that the shaft body 1 to be drilled is inserted into the positioning tube 5, so that the fixing tube 51 arranged in the positioning tube 5 is inserted into the mounting cavity 11 arranged in the shaft body 1, and the locking block 543 arranged on the locking mechanism 53 is located opposite to the locking groove 13 arranged on the inner wall of the mounting cavity 11. When the drilling equipment is placed on the supporting assembly 6, the linkage mechanism synchronously drives the locking mechanism 53 to work, and the rear suspension shaft is locked and fixed.

[0054] The locking mechanism 53 locks and fixes the rear suspension shaft in the following mode: the linkage mechanism drives the driving rod 52 to move upwards, the driving rod 52 moves upwards to drive the wedge-shaped block 546 to move upwards, the wedge-shaped block 546 moves upwards to drive the wedge-shaped seat 542 to move around the outside of the driving rod 52, and the wedge-shaped seat 542 drives the sliding block 544 to slide in the sliding groove 541, so as to compress and contract the return spring 545. The wedge-shaped seat 542 drives the locking block 543 arranged on the wedge-shaped seat 542 to move into the locking groove 13, so as to lock and fix the shaft body 1.

[0055] In this embodiment, the shaft body 1 is inserted into the positioning tube 5 and is circumferentially wrapped and positioned by the inner wall of the positioning tube 5. When the drilling equipment is placed on the supporting assembly 6 to prepare for drilling the shaft body 1 contained in the positioning tube 5, the placing action of the equipment triggers the linkage mechanism to respond in time, the linkage mechanism synchronously drives the locking mechanism 53 to act, and reliable locking and fixing force is applied to the shaft body 1 in the positioning tube 5, so as to lock and fix the shaft body 1.

[0056] When the mandrel body 1 is inserted into the positioning tube 5, the wrapping positioning provided by the inner wall thereof first restricts most of the degrees of freedom of the mandrel, laying a good foundation for initial positioning, and when the hole opening device is placed on the support assembly 6, the linkage mechanism triggers the locking mechanism 53 to rigidly lock the mandrel body 1. This dynamic locking mechanism is automatically completed at the beginning of processing without additional manual intervention, greatly simplifying the operation process and improving efficiency, and effectively avoiding the risk of slight displacement or vibration of the mandrel caused by cutting resistance in the traditional clamping mode.

[0057] In summary, the present application uses the double protection of wrapping positioning and dynamic locking to firmly lock the position of the rear suspension mandrel during processing, fundamentally suppressing the vibration source and creating an extremely stable processing environment for the tool. Ultimately, the shape accuracy of the processed hole is reliably guaranteed, and the product consistency and pass rate are substantially improved.

[0058] The positioning tube 5 is a stepped shaft, the outer diameter of the upper part of the positioning tube 5 is larger than that of the lower part, and the outer wall of the upper part of the positioning tube 5 is provided with a hole opening groove 501. The hole opening groove 501 is provided with a plurality of hole opening grooves 501, and the plurality of hole opening grooves 501 are annularly and equally spaced around the outer side of the positioning tube 5.

[0059] The wedge-shaped seat 542 is provided with a plurality of wedge-shaped seats 542, and the plurality of wedge-shaped seats 542 are annularly and equally spaced around the outer side of the driving rod 52. The inner wall of the wedge-shaped seat 542 is provided with an inclined surface 547 matched with the wedge-shaped block 546.

[0060] In this embodiment, the inclined surface 547 matched with the wedge-shaped block 546 is provided on the inner wall of the wedge-shaped seat 542. Referring to Figures 7-8 As can be seen, the inclined surface 547 and the wedge-shaped seat 542 form a boss, and the wedge-shaped block 546 is assisted and limited by the boss. The height of the wedge-shaped block 546 is limited, so that the height of the driving rod 52 is limited, and the driving rod 52 is prevented from driving the support assembly 6 in reverse through the linkage mechanism, so that the pressure block 72 is ejected from the rectangular groove 71, and the stability of use is affected.

[0061] The support assembly 6 comprises a base 61 fixed on the machining table 4, a support pipe 62 welded on the upper surface of the base 61, a support plate 63 vertically welded on the top end of the support pipe 62, and a rectangular groove 71 formed in the center of the upper surface of the support plate 63.

[0062] The linkage mechanism comprises a support plate 83 and a linkage rod 73 inserted in the support pipe 62, the top end of the linkage rod 73 extends into the rectangular groove 71 through the support plate 63, the bottom end of the linkage rod 73 extends to the outside through the machining table 4, the top end of the linkage rod 73 is welded and fixed with a pressure block 72, a limiting disc 74 is welded on the outer wall of the linkage rod 73 below the machining table 4, a tension spring 75 is sleeved on the linkage rod 73 between the limiting disc 74 and the machining table 4, the bottom end of the tension spring 75 is welded and fixed with the limiting disc 74, and the top end of the tension spring 75 is welded and fixed with the lower surface of the machining table 4.

[0063] Two connecting arms 81 are symmetrically arranged at the center of the two side walls of the support plate 83, the support plate 83 is rotationally connected between the two connecting arms 81 through a connecting shaft 82, the top end of each of the two connecting arms 81 is welded and fixed with the machining table 4, and a rectangular limiting frame 84 is welded at the corner of the upper surface of the support plate 83.

[0064] It should be noted that in the initial state, the linkage mechanism is driven upward by the tension of the tension spring 75, so that the upper part of the pressure block 72 moves upward above the rectangular groove 71, and the bottom end of the linkage rod 73 and the bottom end of the convex seat 521 are at the same horizontal plane, and are mutually fitted with the upper surface of the support plate 83, at this time, the support plate 83 is also in a horizontal state.

[0065] Specifically, the working mode of the linkage mechanism is that when the hole machining equipment is placed on the support assembly 6 and is ready to machine the mandrel body 1 contained in the positioning pipe 5, the hole machining equipment extrudes the pressure block 72 to move downward into the rectangular groove 71, synchronously driving the linkage rod 73 to move downward, at this time, the tension spring 75 is in a stretched state, the linkage rod 73 moves downward, pushing the one end of the support plate 83 close to the linkage rod 73 to move downward, thereby driving the one end close to the convex seat 521 to move upward, pushing the convex seat 521 to move upward, the convex seat 521 moving upward drives the driving rod 52 to move upward, the driving rod 52 moving upward drives the wedge-shaped block 546 to move upward, the wedge-shaped block 546 moving upward drives the wedge-shaped seat 542 to move to the outside of the driving rod 52, and pushes the sliding block 544 to slide in the sliding groove 541, extrudes the reset spring 545 to shrink, moves the locking block 543 arranged on the wedge-shaped seat 542 into the locking groove 13 through the movement of the wedge-shaped seat 542, and realizes the locking and fixing of the mandrel body 1.

[0066] In this embodiment, the mandrel body 1 is inserted into the positioning pipe 5 and is circumferentially wrapped and positioned by the inner wall of the positioning pipe 5, in this state, when the hole machining equipment is placed on the support assembly 6 and is ready to machine the mandrel body 1 contained in the positioning pipe 5, the equipment placing action will trigger the linkage mechanism to respond instantly, the linkage mechanism synchronously drives the locking mechanism 53 to act, and applies a reliable locking and fixing force to the mandrel body 1 already in the positioning pipe 5, so as to realize the locking and fixing of the mandrel body 1.

[0067] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. The special fixture for drilling rear suspension shaft, the rear suspension shaft is provided with an installation cavity (11), and a locking groove (13) is arranged on the inner wall of the installation cavity (11), characterized in that, The clamp comprises a machining table (4) and a positioning pipe (5), a circular hole (41) is formed in the upper surface of the machining table (4), the positioning pipe (5) is welded and fixed in the circular hole (41), a fixed pipe (51) is fixed on the inner bottom plate of the positioning pipe (5), a driving rod (52) is inserted in the fixed pipe (51), and a locking mechanism (53) is arranged at the top end of the fixed pipe (51); A supporting assembly (6) is arranged between the two adjacent positioning pipes (5) on the machining table (4), a linkage mechanism is arranged on the supporting assembly (6), and the linkage mechanism is in transmission connection with the locking mechanism (53); when the opening equipment is placed on the supporting assembly (6) to perform opening machining on the rear suspension shaft core placed in the positioning pipe (5), the linkage mechanism synchronously drives the locking mechanism (53) to lock and fix the rear suspension shaft core in the positioning pipe (5); The top end of the driving rod (52) extends to the outside through the top end of the fixed pipe (51), and the bottom end of the driving rod (52) extends to the outside through the positioning pipe (5) and is fixed with a protruding seat (521); The locking mechanism (53) comprises a sliding groove (541), a wedge-shaped seat (542) and a wedge-shaped block (546), the sliding groove (541) is formed in the upper surface of the fixed pipe (51), a plurality of sliding grooves (541) are formed, and the plurality of sliding grooves (541) are annularly and equiangularly distributed around the outside of the driving rod (52), the lower surface of the wedge-shaped seat (542) is welded with a sliding block (544), the sliding block (544) is in sliding connection with the sliding groove (541), a reset spring (545) is welded on one side wall of the sliding block (544), the wedge-shaped block (546) is welded and fixed on the outer wall of the driving rod (52), and a locking block (543) is arranged on the outer wall of the wedge-shaped seat (542); The supporting assembly (6) comprises a base (61) fixed on the machining table (4), a supporting pipe (62) is welded at the center of the upper surface of the base (61), a supporting plate (63) is vertically welded at the top end of the supporting pipe (62), and a rectangular groove (71) is formed in the center of the upper surface of the supporting plate (63); The linkage mechanism comprises a supporting plate (83) and a linkage rod (73) inserted in the supporting pipe (62), the top end of the linkage rod (73) extends into the rectangular groove (71) through the supporting plate (63), the bottom end of the linkage rod (73) extends to the outside through the machining table (4), a pressure bearing block (72) is welded and fixed at the top end of the linkage rod (73), a limiting disc (74) is welded on the outer wall of the linkage rod (73) below the machining table (4), a tension spring (75) is sleeved on the linkage rod (73) between the limiting disc (74) and the machining table (4), the bottom end of the tension spring (75) is welded and fixed with the limiting disc (74), and the top end of the tension spring (75) is welded and fixed with the lower surface of the machining table (4).

2. The special purpose fixture for drilling of rear suspension axle shafts according to claim 1, characterized in that, The processing table (4) is strip-shaped, a plurality of circular holes (41) are arranged, and the plurality of circular holes (41) are equidistantly arranged on the processing table (4) along the length direction of the processing table (4).

3. The special purpose fixture for drilling of rear suspension axle shafts according to claim 1, characterized in that, Two connecting arms (81) are symmetrically arranged at the center of the two side walls of the supporting plate (83), the supporting plate (83) is rotationally connected between the two connecting arms (81) through a connecting shaft (82), the top end of each of the two connecting arms (81) is welded and fixed with the processing table (4), and a rectangular limiting frame (84) is welded at the corner of the upper surface of the supporting plate (83).

4. The special purpose fixture for drilling of rear suspension axle shafts according to claim 1, characterized in that, The positioning pipe (5) is in the shape of a stepped shaft, the outer diameter of the upper portion of the positioning pipe (5) is larger than that of the lower portion, an opening groove (501) is arranged on the outer wall of the upper portion of the positioning pipe (5), a plurality of opening grooves (501) are arranged, and the plurality of opening grooves (501) are annularly and equidistantly distributed around the outer side of the positioning pipe (5).

5. The special purpose fixture for drilling of rear suspension axle shafts as claimed in claim 1, wherein, A plurality of wedge-shaped seats (542) are arranged, the plurality of wedge-shaped seats (542) are annularly and equidistantly distributed around the outer side of the driving rod (52), and an inclined surface (547) matched with the wedge-shaped block (546) is arranged on the inner wall of the upper portion of the wedge-shaped seat (542).

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