Half shaft auxiliary detection gauge

Abstract

This utility model discloses an auxiliary inspection fixture for half-shafts, including an inspection platform, a three-jaw chuck, a bushing, a support bearing, and a positioning block of the same diameter as the shaft. The support bearing is fixed to the inspection platform, the bushing is fixed inside the support bearing, the three-jaw chuck is fixed to the head of the bushing, and the positioning block of the same diameter as the shaft is located at the tail of the bushing. The half-shaft shaft passes through the three-jaw chuck and the bushing to the oscillating rolling positioning and clamping part. The three-jaw chuck clamps the shaft, and the positioning block stabilizes the center, making the two concentric. This fixture can quickly measure the inner end runout, outer end runout, outer circle runout, and perpendicularity of the shaft to the flange of a high-temperature half-shaft after oscillating rolling. It has a simple structure, is easy to clamp, and solves the problems of existing inspections requiring cooling, large errors, and high skill requirements. It effectively prevents defective products from forging and oscillating rolling, and reduces quality loss and scrap rate.

Description

Technical Field

[0001] This utility model provides a testing fixture, and particularly relates to an auxiliary testing fixture for half shafts. Background Technology

[0002] As a core component of the automotive transmission system, the dimensional accuracy of the forged half-shaft (such as the inner end runout, outer end runout, outer diameter runout of the flange, and the perpendicularity of the shaft to the flange) directly determines the transmission efficiency and driving safety of the vehicle. Therefore, it is necessary to strictly control the quality of the forged half-shaft through auxiliary testing devices. The core function of such auxiliary testing devices for automotive half-shaft forging is to determine whether the parts meet the design standards through precise positioning and measurement after the half-shaft has been forged, to promptly intercept defective products, and to prevent defective half-shafts from flowing into subsequent assembly stages and causing safety hazards.

[0003] The existing equipment used for inspecting automotive half-shafts after forging consists of a horizontally placed inspection platform and a V-block fixed on the platform. The inspection process follows a "cooling-positioning-measurement" procedure: first, the half-shaft, which has been forged to a temperature of 1050℃, is naturally cooled to room temperature; then, the half-shaft shaft is placed in the groove of the V-block, with the spline end face of the half-shaft serving as the sole positioning reference; finally, the half-shaft is manually rotated and dimensional measurements are taken using tools such as a dial indicator. However, the existing device has significant shortcomings compared to this application: First, the cooling waiting process is time-consuming, which seriously slows down the testing rhythm and overall production efficiency; Second, it relies solely on the spline end face for positioning and lacks a clamping mechanism, making it prone to lateral movement towards the flange during testing rotation, leading to measurement data deviation; Third, the half-shaft rod directly contacts the V-block groove, and friction occurs between the two during rotation measurement, further aggravating the lateral movement of the half-shaft and increasing the testing error; Fourth, operation requires precise manual control of positioning, rotation, and measurement actions, which places high demands on the skills of the testing personnel, carries a high risk of misjudgment, and ultimately results in a high forging scrap rate, failing to meet the demand for efficient and accurate half-shaft testing. Utility Model Content

[0004] To address the problems of existing automotive half-shaft forging inspection devices, such as "long cooling time and low inspection efficiency", "easy movement without clamping and large measurement error", "friction of the rod exacerbates the error", and "high skill requirements and high scrap rate", this utility model provides a half-shaft auxiliary inspection fixture that achieves the goals of rapid inspection without cooling, stable positioning without movement, and lowering the operation threshold.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a half-shaft auxiliary inspection fixture, including a horizontally arranged inspection platform, a three-jaw chuck, a hollow bushing, a support bearing, and an annular rod-diameter positioning block; the support bearing is fixedly installed at the middle position of the upper surface of the inspection platform, and the inner hole of the support bearing is horizontally extended. The support bearing includes a block-shaped bearing seat and a rolling bearing embedded in the bearing seat. At least two vertically penetrating mounting holes are opened at the bottom of the bearing seat. Threaded holes are opened at the corresponding positions on the upper surface of the inspection platform. Bolts pass through the mounting holes of the bearing seat and are screwed into the threaded holes of the inspection platform to achieve a fixed connection between the support bearing and the inspection platform. The inner ring of the rolling bearing in the support bearing is interference-fitted with the outer circumferential surface of the bushing, and the outer ring of the rolling bearing is interference-fitted with the inner wall of the bearing seat to prevent radial movement of the bushing.

[0006] The outer circumferential surface of the bushing is adapted to the inner wall of the support bearing. The bushing is coaxially inserted and fixed in the inner hole of the support bearing, so that the bushing is erected horizontally above the inspection platform. The length of the bushing is 1 / 2 to 2 / 3 of the total length of the half shaft to be tested, and the front end face of the bushing extends beyond the front end face of the support bearing. The rear end face of the bushing is flush with the rear end face of the support bearing, ensuring that after the half shaft is inserted, its oscillating positioning and clamping part can accurately correspond to the jaws of the three-jaw chuck.

[0007] The three-jaw chuck has a base for fixing and a swivel positioning clamping part for clamping jaws (the outer peripheral surface of which is adapted). The lower surface of the base of the three-jaw chuck is fixedly connected to the upper surface of the inspection platform by bolts. The upper surface of the inspection platform has an elongated adjustment hole extending along the axis of the bushing at the position corresponding to the base. After the bolt passes through the mounting hole of the base, it passes through the adjustment hole, which can finely adjust the axial distance between the three-jaw chuck and the bushing to adapt to half shafts of different lengths. Furthermore, a positioning pin is provided between the rear end face of the three-jaw chuck base and the front end face of the bushing. One end of the positioning pin is embedded in a pre-set pin hole on the rear end face of the base, and the other end is embedded in a pre-set pin hole on the front end face of the bushing. After pre-positioning, the connection can be detachably fixed by screws. At the same time, the central clamping hole of the three-jaw chuck is coaxially aligned with the inner hole of the bushing.

[0008] The shaft of the half-shaft to be tested can pass sequentially through the central clamping hole of the three-jaw chuck and the inner hole of the bushing from the front end of the three-jaw chuck until the pre-set oscillating positioning clamping part on the half-shaft corresponds to the jaws of the three-jaw chuck; the shaft-diameter same-diameter positioning block is coaxially embedded in the inner hole of the tail of the bushing, the inner diameter of the shaft-diameter same-diameter positioning block is equal to the outer diameter of the half-shaft shaft, and the outer diameter is equal to the inner diameter of the bushing, so that the shaft-diameter same-diameter positioning block, the inner hole of the tail of the bushing, and the half-shaft shaft are all clearance fit, and the end of the half-shaft shaft away from the flange passes through the central hole of the shaft-diameter same-diameter positioning block; by clamping the oscillating positioning clamping part of the half-shaft with the jaws of the three-jaw chuck, and cooperating with the shaft-diameter same-diameter positioning block to radially position the half-shaft shaft at the tail of the bushing, the half-shaft is kept coaxial with the bushing in the inner hole of the bushing, thereby realizing the concentric setting of the three-jaw chuck at the front end of the half-shaft and the shaft-diameter same-diameter positioning block at the tail.

[0009] One or more technical solutions provided in this application have at least the following technical effects or advantages compared with the prior art:

[0010] A. High inspection efficiency: This inspection tool does not require waiting for the high temperature of the forged half shaft to cool down. The half shaft can be directly inserted and fixed for inspection, saving the cooling waiting time and significantly improving inspection efficiency and production speed.

[0011] B. High measurement accuracy: The three-jaw chuck provides stable clamping force, avoiding axial movement of the half shaft towards the flange; at the same time, the same diameter positioning block of the rod cooperates with the bushing to achieve radial positioning of the half shaft rod, and the half shaft rod does not directly rub against other parts, effectively reducing measurement errors and ensuring accurate test data.

[0012] C. Low operating threshold: After the overall structure is assembled and fixed, only a simple operation of "inserting the half shaft - embedding the positioning block - clamping the chuck" is required to carry out the test. There is no need to rely on high-precision control by personnel, which reduces the testing skills requirements for employees and quality inspectors.

[0013] D. Low scrap rate: With its efficient and accurate detection capabilities, it can promptly and accurately determine whether the half shaft is qualified, effectively intercepting defective products generated during the forging and rolling process, and greatly reducing quality loss and forging scrap rate.

[0014] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a half-shaft auxiliary inspection fixture according to the present invention;

[0016] Figure 2This is an elevation view of the same diameter positioning block of the rod part of a half-shaft auxiliary testing fixture according to the present invention.

[0017] As shown in the figure:

[0018] 1. Inspection platform; 2. Three-jaw chuck; 3. Support bearing; 4. Bushing; 5. Positioning block of the same diameter as the rod; 6. Half shaft. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] As attached Figure 1 and Figure 2 As shown, the assembly steps of the auxiliary inspection fixture for half-shafts of this utility model are as follows: First, the bearing seat of the support bearing 3 is fixed to the middle of the upper surface of the inspection platform 1 with bolts, ensuring that the inner hole of the rolling bearing in the bearing seat is horizontal; Second, the bushing 4 is coaxially inserted into the inner ring of the rolling bearing of the support bearing 3, and the bushing 4 is fixed to the rolling bearing by interference fit. At this time, the front end face of the bushing 4 extends beyond the front end face of the support bearing 3, and the rear end face is flush with the rear end face of the support bearing 3; Next, one end of the positioning pin is inserted into the pin hole of the base of the three-jaw chuck 2, and the other end is inserted into the pin hole of the front end face of the bushing 4 to complete the pre-positioning of the three-jaw chuck 2 and the bushing 4. Then, the two are fixed with screws. At the same time, the base of the three-jaw chuck 2 is fixed to the adjustment hole of the inspection platform 1 with bolts. The position of the bolt in the adjustment hole is finely adjusted according to the length of the half-shaft 6 to be inspected, ensuring that the center clamping hole of the three-jaw chuck 2 is coaxially aligned with the inner hole of the bushing 4; Finally, the positioning block 5 of the same diameter as the rod is prepared for use.

[0023] The inspection operation steps are as follows: Insert the forged half-shaft 6 rod into the front end of the three-jaw chuck 2, passing sequentially through the central clamping hole of the three-jaw chuck 2 and the inner hole of the bushing 4, until the oscillating positioning clamping part of the half-shaft 6 corresponds to the soft jaws of the three-jaw chuck 2; then, insert the rod-diameter positioning block 5 into the inner hole of the bushing 4 from the tail end, so that the end of the half-shaft 6 away from the flange passes through the central hole of the rod-diameter positioning block 5; finally, operate the three-jaw chuck 2... The soft jaws clamp the oscillating positioning clamping part of the half shaft 6. At this time, under the clamping force of the three-jaw chuck 2 and the radial positioning action of the rod-diameter positioning block 5, the half shaft 6 remains coaxial with the bushing 4. Then, measuring tools such as dial indicators can be used to measure the inner end runout, outer end runout, outer circle runout of the flange of the half shaft 6, as well as the perpendicularity of the rod to the flange. After the test is completed, the three-jaw chuck 2 is released, the rod-diameter positioning block 5 of the half shaft 6 is removed, and the next half shaft can be tested.

[0024] Based on the above implementation scheme, the applicable scenarios of this utility model can be divided into three categories: high-temperature instant detection of automobile half-shafts after forging and rolling, detection of automobile half-shafts of different lengths and specifications, and key precision detection of automobile half-shaft flanges and rods.

[0025] (I) High-Temperature Immediate Inspection of Automobile Half-Shafts After Forging and Rolling

[0026] This situation addresses the issue in the document that "existing testing methods require waiting for the half-shaft to cool down (after forging at 1050℃), resulting in low efficiency." The core issue is the ability to directly test high-temperature half-shafts without cooling. The usage status of each structure is as follows:

[0027] Inspection Platform 1: It is placed horizontally and in a fixed position, serving as the basic support carrier for the entire inspection tool. All components are assembled on it to ensure that there is no overall displacement during the inspection process, providing a stable benchmark for high-temperature half-shaft testing.

[0028] Support bearing 3: It is fixed to the middle of the upper surface of the inspection platform 1 by bolts. The inner ring of the internal rolling bearing is interference-fitted with the outer circumference of the bushing 4 to tightly clamp the bushing 4, prevent the bushing 4 from moving radially, maintain the horizontal posture of the bushing 4, and ensure the stability when the high temperature half shaft is installed.

[0029] Bushing 4: It is coaxially inserted and fixed in the inner hole of the support bearing 3. Its front end face extends beyond the front end face of the support bearing 3, and its rear end face is flush with the rear end face of the support bearing 3. Its length is 1 / 2 to 2 / 3 of the total length of the high-temperature half shaft 6 to be tested. Its inner hole is unobstructed to allow the half shaft 6 to pass through, and at the same time provides space for the positioning block 5 of the same diameter as the shaft to be installed, so as to avoid the high-temperature half shaft from directly contacting other parts and causing damage.

[0030] Three-jaw chuck 2: The base is fixed to the inspection platform 1 by bolts. The rear end face of the base and the front end face of the bushing 4 are pre-positioned by the positioning pin and then locked with screws to ensure that the center clamping hole of the three-jaw chuck 2 is strictly coaxial with the inner hole of the bushing 4. The jaws are made of soft material (to avoid damaging the surface of the high-temperature half shaft). When the high-temperature half shaft 6 rod is inserted into the "swinging positioning clamping part", the jaws clamp the part evenly to provide stable clamping force and prevent the high-temperature half shaft from moving in the flange direction.

[0031] Positioning block 5 with the same diameter as the rod: After the high-temperature half shaft 6 passes through the bushing 4, it is coaxially inserted into the inner hole of the bushing 4 from the tail end of the bushing 4; its outer diameter is consistent with the inner hole diameter of the bushing 4 (clearance fit), and its inner hole diameter is consistent with the rod diameter of the high-temperature half shaft 6 (clearance fit), which radially positions the half shaft rod at the tail end of the bushing 4, and works with the three-jaw chuck 2 to keep the high-temperature half shaft 6 and the bushing 4 coaxial.

[0032] Half-shaft 6: No cooling is required after forging and rolling (it remains at a high temperature). The rod passes through the center clamping hole of the three-jaw chuck 2 and the inner hole of the bushing 4 from the front end of the three-jaw chuck 2 until the "rolling positioning clamping part" corresponds to the jaw of the three-jaw chuck 2. The end of the rod away from the flange passes through the inner hole of the positioning block 5 of the same diameter as the rod. It remains stable under the clamping and positioning action, so that the inspection personnel can use tools to measure the flange runout and the perpendicularity of the rod to the flange.

[0033] (II) Inspection of Automobile Half Shafts of Different Lengths

[0034] This situation addresses the requirement in the document to "adapt to half-shafts of different lengths" (achieved through the adjustment holes on the inspection platform). The core is to adapt to half-shafts of different lengths by finely adjusting the position of the three-jaw chuck. The usage states of each structure are as follows:

[0035] Inspection platform 1: horizontally fixed, with a "long strip-shaped adjustment hole extending along the axis of bushing 4" at the position corresponding to the base of the three-jaw chuck 2. The adjustment hole provides space for adjusting the front and rear position of the three-jaw chuck 2, ensuring that the overall stability of the inspection fixture is not affected when adapting to half shafts of different lengths.

[0036] Support bearing 3: The fixed position remains unchanged and is still connected to the middle of the upper surface of the inspection platform 1 by bolts. The internal rolling bearing stably supports the bushing 4, maintains the horizontal posture of the bushing 4, and does not change the support state due to the adjustment of the position of the three-jaw chuck 2.

[0037] Bushing 4: The assembly state remains unchanged (coaxially fixed in the support bearing 3), and the length is still "1 / 2-2 / 3 of the total length of the half shaft 6 to be tested" (no need to replace the bushing, only adjust the fitting length by adjusting the position of the three-jaw chuck). The inner hole is always for the half shaft 6 to pass through, and the tail is for the rod to be fitted with the positioning block 5 of the same diameter.

[0038] Three-jaw chuck 2: The bolts on the base are inserted into the adjustment holes of the inspection platform 1. According to the length of the half-shaft 6 to be inspected, the bolts are loosened and the position is slightly adjusted back and forth along the direction of the adjustment hole so that the "swinging positioning clamping part" of the half-shaft 6 can accurately correspond to the chuck jaws after it is inserted. After adjustment, the bolts are tightened to fix the base. Then, the positioning pin is used to pre-position the half-shaft 4 with the front end face of the bushing 4 and the screws are locked to ensure that the center clamping hole is coaxial with the inner hole of the bushing 4. The chuck jaws still use soft material to clamp the half-shaft to avoid damage.

[0039] Positioning block 5 with the same diameter as the rod: Based on the diameter of the rod of the half shaft 6 to be tested, select a positioning block whose inner diameter is consistent with the diameter of the rod of the half shaft, and install it in the inner hole of the tail of the bushing 4 to perform radial positioning of the tail rod of half shafts of different lengths, and maintain the coaxiality of the half shaft 6 and the bushing 4.

[0040] Half-shaft 6: When the half-shaft 6 rods of different lengths are inserted, the position of the three-jaw chuck 2 in the adjustment hole is adjusted to ensure that the "swinging positioning clamping part" is precisely aligned with the jaws; the rod part away from the flange end is inserted through the inner hole of the matching rod part positioning block 5 of the same diameter, and remains stable under the clamping and positioning action to meet the testing requirements of half-shafts of different lengths.

[0041] (III) Key Precision Inspection of Automobile Half-Shaft Flange and Rod

[0042] This scenario addresses the core inspection requirement in the document: "measuring the inner end runout, outer end runout, and outer circle runout of the flange to determine the perpendicularity of the rod and flange." The key is to ensure inspection accuracy through precise coordination of all components. The usage status of each component is as follows:

[0043] Inspection Platform 1: It is horizontally fixed and has a flat surface without obvious deformation or displacement, providing a stable benchmark for accuracy testing and avoiding reading errors of measuring tools such as dial indicators due to platform shaking.

[0044] Support bearing 3: The connecting bolts to the inspection platform 1 are fully tightened and there is no looseness; the inner ring of the internal rolling bearing is interference-fitted with the outer circumference of the bushing 4, and the outer ring is interference-fitted with the inner wall of the bearing housing, which completely restricts the radial movement of the bushing 4 and provides deviation-free support for the bushing 4, which is the basic guarantee for accuracy testing.

[0045] Bushing 4: The coaxiality error between the inner hole and the center clamping hole of the three-jaw chuck 2 is extremely small (achieved by pre-positioning through the positioning pin), and there is no radial sway when the half shaft 6 rod is inserted in the inner hole of the bushing; the bushing 4 itself has no bending deformation, providing stable guidance for the rotation detection of the half shaft 6 (the half shaft needs to be rotated to measure runout).

[0046] Three-jaw chuck 2: When the jaws clamp the half shaft 6 at the "swing positioning clamping part", the clamping force is uniform and moderate (no deformation of the half shaft due to excessive tightness, and no movement due to excessive looseness); the coaxiality of the center clamping hole and the inner hole of the bushing 4 is strictly controlled to ensure that there is no radial offset when the half shaft 6 rotates, providing an accurate rotation reference for flange runout measurement.

[0047] The rod-diameter positioning block 5 has a very small gap between its inner hole and the rod of the half shaft 6 (only to meet the requirements of insertion), and the fit gap between its outer circle and the inner hole of the bushing 4 is also very small, which completely restricts the radial displacement of the tail of the rod of the half shaft 6; in conjunction with the front end clamping of the three-jaw chuck 2, the overall coaxiality of the half shaft 6 is extremely high, and there is no radial runout when rotating, ensuring the accuracy of the measurement data of the runout index of the flange.

[0048] Half-shaft 6: Under the clamping action of the three-jaw chuck 2 and the positioning action of the rod-diameter positioning block 5, it is coaxially and stably mounted in the bushing 4; there is no axial movement or radial wobble when rotating half-shaft 6. The inspector can attach the dial indicator probe to the inner end, outer end and outer circle of the flange, and read the runout data by rotating half-shaft. At the same time, the perpendicularity between the rod and the flange is determined by the relative positional relationship between the rod and the flange (combined with the test platform reference), so as to achieve accurate detection of key accuracy indicators.

[0049] When using this device, please refer to the following existing references:

[0050] The dial indicator and magnetic base are the core measuring tools for detecting the runout of the half-shaft flange and the perpendicularity of the rod to the flange. During testing, the magnetic base is attached to the inspection platform. The adjusting arm of the magnetic base can be flexibly adjusted in angle and height, allowing the dial indicator probe to accurately contact the inner, outer, or outer cylindrical surface of the flange. During the rotation of the half-shaft, the dial indicator pointer will deflect according to the undulations of the flange surface. Reading the maximum difference in pointer swing directly provides the data for the inner, outer, and outer cylindrical runout of the flange. To determine the perpendicularity of the rod to the flange, the dial indicator probe is placed against the edge of the flange end face, and the half-shaft is slowly rotated. If the difference in the dial indicator reading is within the allowable range, the perpendicularity of the rod to the flange meets the requirements; otherwise, it is considered unqualified.

[0051] Both hex wrenches and open-end wrenches are essential tools for assembling and disassembling the various components of this device. When installing the support bearing, use an open-end wrench to tighten the bolts connecting the bearing housing and the inspection platform to ensure that the bearing housing is firmly fixed to the center of the upper surface of the inspection platform. When fixing the three-jaw chuck and the bushing, use an hex wrench to tighten the screws connecting them to prevent loose screws from causing misalignment of the three-jaw chuck and the bushing. During disassembly and maintenance, use an hex wrench to loosen the screws and an open-end wrench to unscrew the bolts, making it easy to clean or replace components such as the support bearing and the bushing.

[0052] The standard shaft is used for coaxiality calibration before initial use or after long-term use of this device. During calibration, the standard shaft is sequentially passed through the center clamping hole of the three-jaw chuck, the inner hole of the bushing, and the center hole of the locating block of the same diameter on the shaft. Then, the dial indicator is fixed to the magnetic base, with the dial indicator probe in contact with the outer surface of the standard shaft. The standard shaft is slowly rotated, and the swing of the dial indicator pointer is observed. If the pointer swing exceeds 0.02mm, it indicates a deviation in the coaxiality of the three-jaw chuck and the bushing. The position of the three-jaw chuck in the adjustment hole of the inspection platform needs to be adjusted, or the assembly condition of the bushing and the support bearing needs to be checked, until the dial indicator pointer swing meets the calibration requirements, ensuring that the half-shaft maintains a stable coaxial state during subsequent testing.

[0053] Industrial alcohol and cleaning cloths are used for cleaning and maintenance of this device before and after use. Before testing, the upper surface of the testing platform, the jaws of the three-jaw chuck, the inner hole of the bushing, and the inner and outer diameters of the rod-type positioning block with the same diameter should be wiped with a cleaning cloth soaked in industrial alcohol to remove residual iron filings, oil stains, and other impurities from the surface, so as to avoid impurities affecting the fit accuracy between parts or scratching the surface of the half shaft. After testing, each part should be cleaned again with a cleaning cloth soaked in industrial alcohol, especially the inner hole of the bushing and the inner hole of the rod-type positioning block with the same diameter, to remove any oxide scale that may have fallen off from the high-temperature half shaft, thus extending the service life of each part of this device.

[0054] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A half-shaft auxiliary inspection fixture, characterized in that, The system includes a horizontally arranged inspection platform (1), a three-jaw chuck (2), a hollow bushing (4), a support bearing (3), and an annular rod-diameter positioning block (5). The support bearing (3) is fixedly installed at the middle of the upper surface of the inspection platform (1), and the inner hole of the support bearing (3) extends horizontally. The outer circumferential surface of the bushing (4) is adapted to the inner wall of the support bearing (3), and the bushing (4) is coaxially inserted and fixed in the inner hole of the support bearing (3), so that the bushing (4) is horizontally mounted above the inspection platform (1). The three-jaw chuck (2) has a base for fixing and jaws for clamping. The lower surface of the base of the three-jaw chuck (2) is fixedly connected to the upper surface of the inspection platform (1) by bolts, and the rear end face of the base is detachably fixedly connected to the front end face of the bushing (4) by screws. At the same time, the center of the three-jaw chuck (2) is fixedly mounted in the middle of the upper surface of the inspection platform (1). The clamping hole is coaxially aligned with the inner hole of the bushing (4); the rod of the half shaft (6) to be tested can pass through the central clamping hole of the three-jaw chuck (2) and the inner hole of the bushing (4) sequentially from the front end of the three-jaw chuck (2) until the preset swing positioning clamping part on the half shaft (6) corresponds to the jaw of the three-jaw chuck (2); the rod-diameter positioning block (5) is coaxially embedded in the tail inner hole of the bushing (4), and the rod of the half shaft (6) is far away from the flange. The end passes through the center hole of the rod-diameter positioning block (5), and the chuck of the three-jaw chuck (2) clamps the oscillating positioning clamping part of the half shaft (6). The rod-diameter positioning block (5) coordinates with the radial positioning of the half shaft (6) at the tail of the bushing (4), so that the half shaft (6) remains coaxial with the bushing (4) in the inner hole of the bushing (4), thereby realizing the concentric setting of the three-jaw chuck (2) at the front end of the half shaft (6) and the rod-diameter positioning block (5) at the tail end.

2. The semi-axle auxiliary detection gauge of claim 1, wherein, The support bearing (3) includes a block-shaped bearing housing and a rolling bearing embedded inside the bearing housing. The bottom of the bearing housing has at least two through mounting holes. The upper surface of the inspection platform (1) has threaded holes corresponding to the mounting holes of the bearing housing. After the bolt passes through the mounting holes of the bearing housing, it is screwed into the threaded holes of the inspection platform (1) to achieve a fixed connection between the support bearing (3) and the inspection platform (1).

3. The axle auxiliary inspection fixture according to claim 1, characterized in that, A positioning pin is provided between the rear end face of the base of the three-jaw chuck (2) and the front end face of the bushing (4). One end of the positioning pin is embedded in a pre-set pin hole on the rear end face of the base of the three-jaw chuck (2), and the other end is embedded in a pre-set pin hole on the front end face of the bushing (4) to realize the pre-positioning of the three-jaw chuck (2) and the bushing (4). The three-jaw chuck (2) and the bushing (4) are then locked and fixed by screws.

4. The axle auxiliary inspection fixture according to claim 1, characterized in that, The inner diameter of the rod-shaped positioning block (5) is equal to the outer diameter of the rod of the half shaft (6) to be tested, and the outer diameter of the rod-shaped positioning block (5) is equal to the inner diameter of the bushing (4), so that the rod-shaped positioning block (5) and the inner hole of the bushing (4) are in clearance fit, and the rod-shaped positioning block (5) and the rod of the half shaft (6) are in clearance fit.

5. The axle auxiliary inspection fixture according to claim 1, characterized in that, The length of the bushing (4) is 1 / 2 to 2 / 3 of the total length of the shaft of the half shaft (6) to be tested, and the front end face of the bushing (4) extends beyond the front end face of the support bearing (3). The rear end face of the bushing (4) is flush with the rear end face of the support bearing (3), ensuring that after the shaft of the half shaft (6) passes through the bushing (4), the oscillating positioning clamping part of the half shaft (6) can accurately correspond to the jaws of the three-jaw chuck (2).

6. The semi-axle assist detection gauge of claim 2, wherein, The inner ring of the rolling bearing in the support bearing (3) is interference-fitted with the outer circumferential surface of the bushing (4), and the outer ring of the rolling bearing is interference-fitted with the inner wall of the bearing seat in the support bearing (3) to achieve stable fixation of the bushing (4) in the support bearing (3) and prevent the bushing (4) from moving radially.

7. The axle auxiliary inspection fixture according to claim 1, characterized in that, The upper surface of the inspection platform (1) is provided with an elongated adjustment hole corresponding to the position of the base of the three-jaw chuck (2). The adjustment hole extends along the axial direction of the bushing (4). The bolt passes through the mounting hole of the base of the three-jaw chuck (2) and then into the adjustment hole. By adjusting the position of the bolt in the adjustment hole, the axial distance between the three-jaw chuck (2) and the bushing (4) can be finely adjusted to adapt to the half shaft (6) rod of different lengths.

8. The axle auxiliary inspection fixture according to claim 1, characterized in that, The jaws of the three-jaw chuck (2) are soft clamping jaws. The inner clamping surface of the soft clamping jaws is adapted to the outer peripheral surface of the oscillating positioning clamping part of the half shaft (6), so as to avoid damaging the rod surface of the half shaft (6) when clamping the half shaft (6).

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