A symmetry detection auxiliary device for a drive shaft press assembly

Abstract

This utility model relates to the field of testing device technology, specifically to an auxiliary device for symmetry testing of a drive shaft press-fit assembly. It includes a support base, which includes a support cylinder with a horizontally aligned axis. A mandrel is rotatably fitted inside the support cylinder, also with a horizontally aligned axis. The mandrel has a first end and a second end, with the first end extending out of the support cylinder. The outer circumferential surface of the first end has an external spline that mates with the internal spline of the drive shaft press-fit assembly. This utility model simulates the meshing and positioning relationship during actual assembly by mates the external spline of the first end of the mandrel with the internal spline of the drive shaft press-fit assembly, ensuring consistency between the symmetry test and the positioning reference during actual assembly, thereby improving the accuracy of the test results for actual assembly.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, specifically to an auxiliary device for testing the symmetry of a transmission shaft press-fit assembly. Background Technology

[0002] In the fields of automotive transmission systems and heavy machinery power transmission, the driveshaft press assembly, as a core power transmission component, directly determines the overall machine's operational stability, transmission efficiency, and service life through its assembly precision. During the manufacturing process of the driveshaft press assembly, the symmetry inspection of its lugs is crucial, as the symmetry of the two lugs determines the product quality after subsequent assembly.

[0003] In the prior art, patent publication number CN223021128U discloses a transmission shaft spline fork inspection and placement bracket. Its design concept is to set a horizontally positioned inspection sleeve on the placement platform. The inner surface of the inspection sleeve is provided with an internal spline that matches the external spline structure on the surface of the spline fork. By fitting the spline fork into the inspection sleeve, the horizontal state of the spline fork can be maintained, which facilitates the inspection personnel to perform symmetry inspection on the two lugs. This can solve the problem of the spline fork being difficult to horizontally position.

[0004] However, in actual installation, most driveshaft press-fit assemblies are positioned and installed by the engagement of the internal spline with the external spline of the driveshaft. If the aforementioned patent's technique of fitting the outer circle of the driveshaft press-fit assembly into a testing sleeve for reference positioning to facilitate symmetry testing is used, it cannot simulate the actual spline engagement relationship between the driveshaft press-fit assembly and the driveshaft during assembly. This may lead to inaccurate test results due to coaxiality errors between the outer circle and the internal spline of the driveshaft press-fit assembly. Therefore, the driveshaft spline fork testing and placement bracket disclosed in the aforementioned patent is not suitable for driveshaft press-fit assemblies positioned and installed by the engagement of the internal spline with the external spline of the driveshaft. Utility Model Content

[0005] To address the issue that most drive shaft press-fit assemblies are positioned and installed by the engagement of internal splines with the external splines of the drive shaft, the existing technology of fitting the outer circle of the drive shaft press-fit assembly into a testing sleeve for reference positioning to facilitate symmetry testing cannot simulate the actual spline engagement relationship between the drive shaft press-fit assembly and the drive shaft during assembly. This may lead to inaccurate test results due to coaxiality errors between the outer circle and the internal splines of the drive shaft press-fit assembly. Therefore, this invention provides an auxiliary device for symmetry testing of drive shaft press-fit assemblies.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A symmetry detection auxiliary device for a drive shaft press assembly includes a support base, which includes a support cylinder with its axis horizontally aligned. A mandrel is rotatably fitted inside the support cylinder, with its axis also horizontally aligned. The mandrel includes a first end and a second end. The first end of the mandrel extends out of the support cylinder, and its outer circumferential surface is provided with an external spline that can mate with the internal spline of the drive shaft press assembly.

[0008] By adopting the above structural scheme, the external spline at the first end of the mandrel engages with the internal spline of the drive shaft press-fit assembly, simulating the meshing and positioning relationship during actual assembly. This ensures that the positioning reference during symmetry testing is consistent with that during actual assembly, thereby improving the accuracy of the test results in serving actual assembly. Both the support cylinder and the mandrel are horizontally positioned and have a rotatable fit. After the drive shaft press-fit assembly is mounted on the mandrel via the spline fit, it can rotate freely around the mandrel's axis. Inspectors can perform symmetry testing on key parts of the drive shaft press-fit assembly, such as the lugs, without repeatedly disassembling and adjusting the workpiece position. For example, in existing technologies, symmetry can be determined by whether a vertical telescopic shaft can pass through both lugs simultaneously, improving the convenience of the testing operation. The support base provides stable support for the overall structure, and the support cylinder provides radial restraint to the mandrel, ensuring that the mandrel always maintains a horizontal axis during rotation. This prevents the drive shaft press-fit assembly from shaking or falling off due to mandrel misalignment, ensuring the safety of the testing process and the stability of the test data.

[0009] As a preferred implementation of an auxiliary device for symmetry detection of a drive shaft press assembly, the side wall of the support cylinder is provided with a screw hole that extends vertically into the inside of the support cylinder, and a set screw is connected to the screw hole by a thread; the outer circumferential surface of the mandrel is provided with a ring-shaped positioning groove, and the bottom end of the set screw can be inserted into the positioning groove.

[0010] The above structural design features a threaded connection between the set screw and the screw hole. The set screw engages with a positioning groove on the outer circumference of the mandrel. When the bottom end of the set screw is inserted into the positioning groove, the mandrel can be finely adjusted axially and rotated circumferentially before being fully tightened, thus adjusting the inspection angle of the drive shaft press-fit assembly. After the set screw is tightened, it provides axial and circumferential limits to the mandrel, preventing it from sliding back and forth along its own axis during inspection and preventing circumferential rotation. This design is suitable for situations requiring the drive shaft press-fit assembly to be fixed for symmetry testing, such as using a height caliper to measure the height difference between the two ear holes to determine symmetry. The mandrel can be positioned and unlocked simply by tightening the set screw, eliminating the need for complex disassembly and assembly steps. Inspection personnel can quickly learn to operate this system, reducing operational errors and improving inspection efficiency.

[0011] As a preferred implementation of an auxiliary device for symmetry detection of a drive shaft press assembly, a cylindrical transition sleeve is provided between the inner circumferential surface of the support cylinder and the outer circumferential surface of the mandrel. The side wall of the transition sleeve is provided with a vertically penetrating transition hole, and the upper and lower ends of the transition hole are respectively connected to a screw hole and a positioning groove.

[0012] By adopting the above structural design, a cylindrical transition sleeve is added between the support cylinder and the mandrel. The rotation of the mandrel is converted into relative rotation between the mandrel and the transition sleeve, and between the transition sleeve and the support cylinder. This avoids direct contact and friction between the outer circumference of the mandrel and the inner circumference of the support cylinder, thus extending the service life of the device. The transition sleeve can be made of wear-resistant, low-friction materials, such as copper alloys or engineering plastics. Compared to the direct fit between the mandrel and the support cylinder, it can effectively reduce rotational friction resistance, making the mandrel rotate more smoothly. The testing personnel do not need to apply excessive force to drive the transmission shaft press assembly to rotate, reducing operator fatigue.

[0013] In a preferred implementation of an auxiliary device for symmetry detection of a drive shaft press assembly, one end of the transition sleeve protrudes outward to form a limiting shoulder, which can abut against the end face of the support cylinder. The limiting shoulder is located on the end of the transition sleeve near the first end of the mandrel.

[0014] By adopting the above structural scheme, the axial positioning of the transition sleeve can be completed by pushing the transition sleeve until the limiting shoulder fits against the end face of the support cylinder, which simplifies the assembly steps of the device and improves the assembly efficiency.

[0015] In a preferred implementation of an auxiliary device for symmetry detection of a drive shaft press assembly, the second end of the mandrel extends out of the support cylinder, and the outer circumference of the second end of the mandrel protrudes outward to form a positioning shoulder, which can abut against the end face of the support cylinder.

[0016] With the above structural design, when assembling the mandrel, it is only necessary to pass the first end of the mandrel through the support cylinder until the positioning shoulder abuts against the end face of the support cylinder, which can prevent the second end of the mandrel from coming out of the support cylinder and complete the initial axial positioning of the mandrel.

[0017] In a preferred embodiment of an auxiliary device for symmetry detection of a drive shaft press assembly, a handle is provided on the end face of the second end of the mandrel near the outer edge. There are two handles, which are arranged along the radial direction of the mandrel.

[0018] With the above structural design, the two handles on the second end face of the mandrel are arranged radially. Inspectors can hold both handles with both hands and easily rotate the mandrel by applying force. Compared to directly rotating the outer circumference of the mandrel by hand, this method requires less effort and is more stable, avoiding uneven rotation caused by slippage between the hand and the mandrel's outer circumference. This ensures uniform rotation of the drive shaft press assembly and improves the accuracy of the inspection data. By rotating the mandrel through the handles, inspectors do not need to directly contact the outer circumference of the mandrel with their hands, preventing sweat and oil from contaminating the mandrel's outer spline or transition sleeve, thus preventing a decrease in fitting accuracy due to contamination. It also avoids hand injuries from the mandrel's outer spline, ensuring the safety of the inspectors.

[0019] In a preferred embodiment of an auxiliary device for symmetry detection of a drive shaft press assembly, the mandrel has a hollow structure and a central hole inside, with the center line of the central hole being coaxial with the center line of the mandrel.

[0020] By adopting the above structural design, the mandrel features a hollow structure with a central hole. This significantly reduces the material usage and overall weight of the mandrel while maintaining its strength. Firstly, the reduced inertia during rotation makes it easier for operators to turn the mandrel by hand, reducing operational burden. Secondly, it also reduces the overall weight of the device, facilitating handling and installation. The central hole of the hollow structure is coaxial with the mandrel, making its cross-section annular. Compared to a solid shaft, an annular cross-section offers higher bending and torsional strength with the same material usage. This effectively improves the mandrel's resistance to deformation when supporting the drive shaft press assembly, preventing bending or twisting due to long-term stress or accidental impact, ensuring the accuracy of the mandrel's axis, and extending its service life.

[0021] In a preferred embodiment of an auxiliary device for symmetry detection of a drive shaft press assembly, the support base includes a trapezoidal platform, and the support cylinder is a square cylinder, with the bottom of the support cylinder connected to the top of the trapezoidal platform.

[0022] The above structural design includes a trapezoidal platform with a trapezoidal cross-section (wider at the bottom and narrower at the top). Compared to a rectangular platform, this provides a larger bottom support area, significantly improving the overall stability of the support and preventing the device from tipping over due to external forces during testing. Simultaneously, the bottom of the support cylinder is connected to the top of the trapezoidal platform, and the connection strength can be ensured through bolts or welding, guaranteeing that the axis of the support cylinder remains horizontal and providing a stable horizontal reference for the mandrel and drive shaft press-fit assembly. Secondly, the support cylinder is designed as a square cylinder. Compared to a circular cylinder, a square cylinder has a larger moment of inertia and stronger torsional and bending rigidity, effectively reducing deformation caused by vibration during mandrel rotation. This prevents the mandrel axis from shifting due to support cylinder deformation, ensuring a stable testing reference and reducing vibration interference with the testing data.

[0023] As a preferred implementation of an auxiliary device for symmetry detection of a drive shaft press assembly, a detection platform is provided at the bottom of the trapezoidal base, and the platform surface of the detection platform is set horizontally.

[0024] With the above structural design, the testing platform at the bottom of the trapezoidal base is horizontally positioned. The testing platform serves as the installation reference for the entire device. After fixing the trapezoidal base to the testing platform, the horizontal surface of the testing platform indirectly ensures that the trapezoidal base, support cylinder, and mandrel are all horizontal, preventing reference deviation due to uneven ground or work surface, and ensuring the uniformity and accuracy of the testing reference. The testing platform can be fixed to the ground with anchor bolts or to the work surface with suction cups or clamps, thereby indirectly fixing the trapezoidal base, support cylinder, and other components. This prevents overall displacement of the entire device due to external forces during testing, ensuring the testing reference remains constant and improving the reliability of the testing data.

[0025] As a preferred implementation of an auxiliary device for detecting the symmetry of a drive shaft press assembly, a trapezoidal base has weight reduction holes.

[0026] By adopting the above structural design, weight-reducing holes are opened on the trapezoidal base. While ensuring the supporting strength of the trapezoidal base, the amount of material used is reduced, significantly lowering the overall weight of the base. On the one hand, this facilitates the handling of the trapezoidal base by testing personnel for device installation and position adjustment; on the other hand, it also reduces the load-bearing pressure on the testing table, extending its service life.

[0027] The beneficial effects of this utility model include:

[0028] First, this utility model simulates the meshing and positioning relationship during actual installation by using the external spline at the first end of the mandrel to cooperate with the internal spline of the transmission shaft press assembly, ensuring that the symmetry detection and the positioning reference during actual installation are consistent, thereby improving the accuracy of the detection results in serving actual installation.

[0029] Secondly, both the support cylinder and the mandrel are horizontally positioned and rotate in a rotatable manner. After the transmission shaft press-fit assembly is installed on the mandrel via a spline fit, it can rotate freely around the mandrel's axis. The inspector does not need to repeatedly disassemble and adjust the workpiece position to perform symmetry testing on key parts such as the lugs of the transmission shaft press-fit assembly. For example, in the prior art, whether a vertical telescopic shaft can pass through both lugs at the same time can be used to determine symmetry, thus improving the convenience of the inspection operation.

[0030] Third, the support base provides stable support for the overall structure, and the support cylinder forms a radial limit on the mandrel, ensuring that the mandrel always maintains a horizontal axis during rotation, avoiding the shaking or falling off of the transmission shaft press assembly due to mandrel misalignment, and ensuring the safety of the testing process and the stability of the test data. Attached Figure Description

[0031] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the symmetry detection auxiliary device for a transmission shaft press-fit assembly in a specific embodiment of this utility model;

[0033] Figure 2 This is a schematic diagram of the transmission shaft press-fit assembly in a specific embodiment of this utility model.

[0034] List of components and reference numerals:

[0035] 1. Support base; 11. Support cylinder; 12. Trapezoidal platform; 2. Mandrel; 21. First end; 22. Second end; 3. Screw hole; 4. Set screw; 5. Positioning groove; 6. Transition sleeve; 7. Transition hole; 8. Limiting shoulder; 9. Positioning shoulder; 10. Handle; 011. Center hole; 012. Testing platform; 013. Weight reduction hole; 014. Ear hole. Detailed Implementation

[0036] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Reference Figure 1-2 This embodiment proposes an auxiliary device for symmetry detection of a drive shaft press-fit assembly, including a support base 1. The support base 1 includes a support cylinder 11 and a trapezoidal platform 12. The axis of the support cylinder 11 is horizontally arranged, and the support cylinder 11 is a square cylinder. The bottom of the support cylinder 11 is connected to the top of the trapezoidal platform 12. A detection platform 012 is provided at the bottom of the trapezoidal platform 12. The platform surface of the detection platform 012 is horizontally arranged, and a weight reduction hole 013 is opened on the trapezoidal platform 12.

[0038] A spindle 2 is rotatably mounted inside the support cylinder 11, with its axis horizontally aligned. The spindle 2 is hollow, with a central hole 011 inside, the axis of which is coaxial with the axis of the spindle 2. The spindle 2 includes a first end 21 and a second end 22. The first end 21 protrudes from the support cylinder 11, and its outer circumferential surface has an external spline that mates with the internal spline of the drive shaft press-fit assembly. The second end 22 protrudes from the support cylinder 11, and its outer circumferential surface protrudes outward to form a positioning shoulder 9 that abuts against the end face of the support cylinder 11. Two handles 10 are located near the outer edge of the end face of the second end 22, arranged radially along the spindle 2.

[0039] The side wall of the support cylinder 11 is provided with a screw hole 3 that extends vertically into the interior of the support cylinder 11, and a set screw 4 is threaded into the screw hole 3; the outer circumferential surface of the spindle 2 is provided with a ring-shaped positioning groove 5, and the bottom end of the set screw 4 can be inserted into the positioning groove 5.

[0040] A cylindrical transition sleeve 6 is rotatably provided between the inner circumferential surface of the support cylinder 11 and the outer circumferential surface of the spindle 2. The side wall of the transition sleeve 6 is provided with a vertically penetrating transition hole 7. The upper and lower ends of the transition hole 7 are respectively connected to the screw hole 3 and the positioning groove 5. One end of the outer circumferential surface of the transition sleeve 6 protrudes outward to form a limiting shoulder 8. The limiting shoulder 8 can abut against the end face of the support cylinder 11. The limiting shoulder 8 is provided on the transition sleeve 6 near the end 21 of the first end of the spindle 2.

[0041] Work process:

[0042] Ensure that the axis of the support cylinder 11 is horizontal. Confirm that the mandrel 2 is rotated and fitted inside the support cylinder 11, and that the axis of the mandrel 2 is also horizontal. The first end 21 of the mandrel 2 protrudes from the support cylinder 11, and the external spline on the outer circumference of the first end 21 is undamaged and free of impurities. The second end 22 of the mandrel 2 also protrudes from the support cylinder 11, and the positioning shoulder 9 of the second end 22 abuts against the end face of the support cylinder 11, thus completing the initial axial positioning of the mandrel 2.

[0043] Check the cylindrical transition sleeve 6 between the inner circumferential surface of the support cylinder 11 and the outer circumferential surface of the spindle 2. Ensure that the upper and lower ends of the transition hole 7 on the side wall of the transition sleeve 6 are connected to the screw hole 3 on the side wall of the support cylinder 11 and the annular positioning groove 5 on the outer circumferential surface of the spindle 2, respectively. The limiting shoulder 8 at one end of the transition sleeve 6 abuts against the end face of the support cylinder 11 to ensure that the transition sleeve 6 is assembled in place, so as to realize the smooth rotation between the spindle 2 and the support cylinder 11 and reduce direct friction.

[0044] The test table 012 at the bottom of the trapezoidal base 12 is fixed to the ground with anchor bolts or to the workbench with suction cups or clamps to ensure that the test table 012 is level. This ensures that the trapezoidal base 12, support cylinder 11, and mandrel 2 are all in a level state, providing a stable and uniform benchmark for subsequent testing.

[0045] Tighten the set screw 4 in the screw hole 3 on the side wall of the support cylinder 11 so that the bottom end of the set screw 4 is inserted into the positioning groove 5 on the outer circumference of the mandrel 2, but not tightened yet. At this time, the mandrel 2 can be finely adjusted in the axial direction and can rotate in the circumferential direction, which is to prepare for the subsequent installation of the drive shaft press assembly and adjustment of the detection angle.

[0046] Clean the internal splines of the drive shaft press-fit assembly and the external splines of the first end 21 of the mandrel 2 to remove surface oil, dust, and other impurities, so as to avoid impurities affecting the spline fit accuracy. Then align the internal splines of the drive shaft press-fit assembly with the external splines of the first end 21 of the mandrel 2 to ensure that the teeth of the two can mesh accurately.

[0047] Slowly push the drive shaft press assembly to gradually engage the internal spline of the drive shaft press assembly with the external spline of the first end 21 of the mandrel 2 until the drive shaft press assembly is installed in place. At this time, the spline engagement simulates the meshing and positioning relationship between the drive shaft press assembly and the drive shaft during actual installation, ensuring that the detection positioning reference is consistent with the actual installation reference.

[0048] The inspector holds the two handles 10 arranged radially on the second end 22 of the mandrel 2 with both hands, and applies force to rotate the mandrel 2 around its own axis. When the mandrel 2 rotates, the transmission shaft press assembly rotates together with the mandrel 2. During the rotation, due to the action of the transition sleeve 6, the mandrel 2 rotates smoothly, and the inspector can easily adjust the angle of the transmission shaft press assembly without repeatedly disassembling the transmission shaft press assembly.

[0049] When the drive shaft press-fit assembly rotates to a suitable angle, using a vertical telescopic shaft (as in existing technology), attempt to pass the vertical telescopic shaft simultaneously through both ear holes 014 of the drive shaft press-fit assembly. If the vertical telescopic shaft can smoothly pass through both ear holes 014 simultaneously, it indicates that the symmetry of the ear holes 014 of the drive shaft press-fit assembly meets the requirements; if it cannot pass through smoothly, it indicates that the symmetry does not meet the requirements, and the test results are recorded. During the test, the support cylinder 11 forms a radial limit on the mandrel 2, ensuring that the mandrel 2 always maintains a horizontal axis, preventing the drive shaft press-fit assembly from shaking or falling off, and ensuring test safety and data stability.

[0050] If the symmetry is checked by measuring the height difference between the two ear holes 014 using a height vernier caliper, after the angle of the drive shaft press-fit assembly is adjusted, turn the set screw 4 on the side wall of the support cylinder 11 clockwise. This will cause the bottom end of the set screw 4 to gradually press against the mandrel 2 in the positioning groove 5, thus limiting the axial and circumferential movement of the mandrel 2 and preventing it from sliding back and forth or rotating circumferentially along its own axis during the test, ensuring the fixed position of the drive shaft press-fit assembly. Use a height vernier caliper to measure the height of the two ear holes 014 of the drive shaft press-fit assembly and calculate the height difference between them. Based on the preset standard height difference range, determine whether the symmetry of the ear holes 014 of the drive shaft press-fit assembly is qualified. If the height difference is within the standard range, the symmetry meets the requirements; otherwise, it does not. Record the test results.

[0051] After the inspection is completed, turn the set screw 4 counterclockwise to separate the bottom end of the set screw 4 from the positioning groove 5 on the outer circumference of the mandrel 2, thereby releasing the fixing limit on the mandrel 2. Grasp the drive shaft press assembly and slowly pull it outward to gradually disengage the internal spline of the drive shaft press assembly from the external spline of the first end 21 of the mandrel 2, and remove the drive shaft press assembly from the mandrel 2.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A symmetry detection auxiliary device for a drive shaft press-fit assembly, comprising a support base (1), characterized in that, The support base (1) includes a support cylinder (11), the axis of the support cylinder (11) is horizontally set, and a spindle (2) is rotatably sleeved inside the support cylinder (11), the axis of the spindle (2) is horizontally set; the spindle (2) includes a first end (21) and a second end (22), the first end (21) of the spindle (2) passes through the support cylinder (11), and the outer peripheral surface of the first end (21) is provided with an external spline, which can cooperate with the internal spline of the transmission shaft press assembly.

2. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 1, characterized in that, The side wall of the support cylinder (11) is provided with a screw hole (3) that extends vertically into the inside of the support cylinder (11), and a set screw (4) is threaded into the screw hole (3); the outer circumferential surface of the spindle (2) is provided with a ring-shaped positioning groove (5), and the bottom end of the set screw (4) can be inserted into the positioning groove (5).

3. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 2, characterized in that, A cylindrical transition sleeve (6) is provided between the inner circumferential surface of the support cylinder (11) and the outer circumferential surface of the spindle (2). The side wall of the transition sleeve (6) is provided with a vertical through transition hole (7). The upper and lower ends of the transition hole (7) are respectively connected to the screw hole (3) and the positioning groove (5).

4. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 3, characterized in that, One end of the transition sleeve (6) protrudes outward to form a ring of limiting shoulder (8). The limiting shoulder (8) can abut against the end face of the support cylinder (11). The limiting shoulder (8) is located on the transition sleeve (6) near the end (21) of the first end of the spindle (2).

5. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 1, characterized in that, The second end (22) of the mandrel (2) protrudes out of the support cylinder (11). The outer circumference of the second end (22) of the mandrel (2) protrudes outward to form a positioning shoulder (9). The positioning shoulder (9) can abut against the end face of the support cylinder (11).

6. The symmetry detection auxiliary device for a drive shaft press-fit assembly according to claim 5, characterized in that, A handle (10) is provided on the end face of the second end (22) of the mandrel (2) near the outer edge. There are two handles (10), and the two handles (10) are arranged in the radial direction of the mandrel (2).

7. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 1, characterized in that, The mandrel (2) is a hollow structure. The mandrel (2) has a central hole (011) inside. The axis of the central hole (011) is coaxial with the axis of the mandrel (2).

8. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 1, characterized in that, The support base (1) includes a trapezoidal platform (12) and a support cylinder (11) which is a square cylinder. The bottom of the support cylinder (11) is connected to the top of the trapezoidal platform (12).

9. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 8, characterized in that, The bottom of the trapezoidal base (12) is provided with a testing platform (012), and the surface of the testing platform (012) is set horizontally.

10. The symmetry detection auxiliary device for a transmission shaft press-fit assembly according to claim 8, characterized in that, The trapezoidal base (12) has a weight reduction hole (013).

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