A detection device for cross axle neck end face run-out

Abstract

The application relates to the technical field of cross shaft detection, in particular to a detection device for the end face runout of a cross shaft neck. The detection device comprises a supporting unit, a limiting unit and a measuring unit. The supporting unit comprises two supporting seats. The top of each supporting seat is provided with a positioning groove. The positioning groove comprises two positioning surfaces. The limiting unit comprises a limiting plate and a limiting ball. The limiting plate has a spacing with the supporting seat. The extension line of the positioning line is perpendicular to the limiting plate. The limiting ball is arranged separately from the limiting plate. The measuring unit is located on the side of the supporting unit far from the limiting unit. The measuring unit comprises a telescopic measuring gauge. The axis of the telescopic measuring head of the telescopic measuring gauge is perpendicular to the limiting plate. The axis of the telescopic measuring head of the telescopic measuring gauge is arranged offset from the symmetry plane of the two positioning surfaces of the positioning groove. Thus, the problem that the cross shaft axially moves and interferes with the accuracy of the detection result caused by the deflection of the limiting plate is solved.

Description

Technical Field

[0001] This application relates to the field of cross shaft detection technology, and more specifically, to a detection device for the runout of the end face of a cross shaft journal. Background Technology

[0002] In the machining and manufacturing process of cross shafts, end face flatness is a key form and position tolerance index for evaluating the machining quality of the journal. Its accuracy is directly related to the assembly fit effect and transmission service performance of the cross shaft. Therefore, it is necessary to use special testing equipment to quantitatively test the end face flatness of the cross shaft. The existing cross shaft end face flatness testing device mainly consists of a support mechanism, an axial positioning mechanism, and a testing execution mechanism. The support mechanism includes two support seats with V-grooves, arranged at a preset interval. The inner groove surface of the V-groove contacts the outer circumferential surface of the cross shaft journal, supporting and lifting the cross shaft as a whole. This achieves radial limitation while providing the cross shaft with the freedom to rotate around its own axis. The axial positioning mechanism is a limiting plate, which is placed on one side of the cross shaft and abuts against the journal end face on the corresponding side of the cross shaft. It is used to provide an axial testing benchmark and constrain the unilateral axial displacement of the cross shaft. The testing execution mechanism uses a telescopic gauge. The measuring contact of the telescopic gauge abuts against the end face of the cross shaft opposite to the limiting plate. During the testing process, the cross shaft is driven to rotate around its own axis. The telescopic gauge expands and contracts accordingly with the height fluctuations of the measured end face, thereby obtaining the end face flatness testing data.

[0003] Due to a combination of factors, including component machining errors, on-site assembly deviations, and long-term wear and tear from equipment operation, the working surface of the limiting plate is prone to angular deviation, making it difficult to ensure strict perpendicularity with the center line connecting the two V-grooves. When the limiting plate is not perpendicular to the line connecting the two V-grooves, the contact point between the journal end face and the limiting plate will periodically change along the axial direction during the rotation of the cross shaft, causing the entire cross shaft to move axially. This axial displacement will directly mix into the measurement values ​​of the telescoping gauge, making it impossible to distinguish from the flatness deviation of the end face itself, ultimately interfering with the accuracy of the test results and leading to a decrease in test precision. Summary of the Invention

[0004] To address the problem of axial movement of the cross shaft caused by the misalignment of the limiting plate, which interferes with the accuracy of the detection results, this application provides a detection device for the runout of the cross shaft journal end face, comprising:

[0005] The support unit includes two support bases; the top of each support base is provided with a positioning groove; the positioning groove includes two positioning surfaces; the tops of the two positioning surfaces are spaced apart, and their bottoms intersect to form a positioning line; the positioning lines on the two support bases are collinear.

[0006] The limiting unit includes a limiting plate and a limiting ball; the limiting plate has a gap with the support base; the extension line of the positioning line intersects the limiting plate perpendicularly; the limiting ball and the limiting plate are separately disposed.

[0007] A measuring unit is located on the side of the support unit away from the limiting unit; the measuring unit includes a telescopic measuring gauge; the axis of the telescopic measuring gauge's telescopic probe intersects the limiting plate perpendicularly; the axis of the telescopic measuring gauge's telescopic probe is offset from the symmetrical planes of the two positioning surfaces of the positioning groove;

[0008] With the cross shaft positioned on the detection device, the circumferential surfaces of the two journals of the cross shaft respectively overlap in the corresponding positioning grooves. The limiting ball abuts between the machining groove on one end face of the journal of the cross shaft and the limiting plate. The telescopic probe of the telescopic gauge abuts against the other end face of the journal of the cross shaft. The machining groove is coaxially arranged with the journal on which it is located.

[0009] When the cross shaft is positioned on the detection device, the cross shaft is rotated around the axis of the journal in the positioning groove to detect the change in the extension distance of the telescopic probe of the telescopic gauge, so as to characterize the runout of the journal end face of the cross shaft.

[0010] Optionally, the limiting unit further includes a barrier; the barrier is annular; the barrier is located on the side of the limiting plate facing the supporting unit; the barrier is connected to the limiting plate; the axis of the barrier is perpendicular to the limiting plate; and the limiting ball is located inside the barrier.

[0011] Optionally, the positioning line is horizontally arranged; the limiting unit further includes a limiting ring; the limiting ring is fixedly connected to the enclosure; the limiting ring is located on the side of the enclosure away from the limiting plate; the limiting ring is coaxial with the enclosure; the limiting ball is located between the limiting plate and the limiting ring; the inner diameter of the limiting ring is smaller than the diameter of the limiting ball.

[0012] Optionally, the positioning line is inclined downward at the end near the limiting plate and upward at the end near the measuring unit; the vertical downward projection of the center of the limiting ball falls on the inner circumferential surface of the enclosure.

[0013] Optionally, the angle between the positioning line and the horizontal plane is a first angle; the inner circumferential surface of the enclosure is a conical surface; the angle between the generatrix of the inner circumferential surface of the enclosure and its own axis is a second angle; the first angle is greater than the second angle.

[0014] Optionally, the limiting unit further includes a magnetic suction part; the magnetic suction part is connected to the limiting plate; the magnetic suction part has a magnetic attraction force on the limiting ball.

[0015] Optionally, the magnetic attraction part is located below the axis of the enclosure.

[0016] Optionally, the support unit further includes a base; the support base is detachably connected to the base; and the spacing between the two support bases is adjustable.

[0017] Optionally, the base is provided with an adjustment groove; one end of the adjustment groove extends toward the limiting unit and the other end extends toward the measuring unit; the support unit further includes a locking member; the locking member passes through the adjustment groove; the support base is fixed relative to the base by the locking member.

[0018] Optionally, the extension direction of the adjustment groove is parallel to the positioning line.

[0019] To address the problem of axial movement of the cross shaft caused by the misalignment of the limiting plate, which interferes with the accuracy of the detection results, this application has the following advantages:

[0020] By incorporating a separate limiting ball within the limiting unit, which abuts against the machining groove on one journal end face of the crossshaft and the limiting plate, a point contact engagement is achieved between the limiting ball and the machining groove on the journal, and simultaneously, a point contact engagement is formed between the limiting ball and the limiting plate. This, combined with two support seats supporting the two journals of the crossshaft and the telescopic gauge abutting against the journal end face on the other side of the crossshaft, ensures that the limiting plate is perpendicular to the positioning line. Furthermore, the separate limiting ball allows for adjustable support height to accommodate different crossshaft specifications. This prevents axial movement during crossshaft rotation detection, ensuring that the telescopic probe's measurement of the telescopic distance corresponds only to the runout of the journal end face. Ultimately, this solves the problem of axial movement of the crossshaft caused by limiting plate misalignment, which interferes with the accuracy of detection results, effectively improving the accuracy and reliability of crossshaft journal end face runout detection. Attached Figure Description

[0021] Figure 1 A schematic diagram of a detection device for runout of the end face of a cross shaft journal is shown in one embodiment;

[0022] Figure 2 It shows Figure 1 A cross-sectional view of a device for detecting runout of the cross shaft journal end face;

[0023] Figure 3 A schematic diagram of a limiting unit of a detection device for runout of the end face of a cross shaft journal is shown in one embodiment;

[0024] Figure 4 A schematic diagram of a detection device for runout of the cross shaft journal end face according to another embodiment is shown;

[0025] Figure 5It shows Figure 4 Enlarged view of point A in the detection device for the runout of the cross shaft journal end face;

[0026] Figure 6 It shows Figure 1 A top view of the support unit of the detection device for the runout of the cross-shaped journal end face;

[0027] Figure 7 It shows Figure 6 The front view of the support base of the support unit in the diagram.

[0028] Reference numerals: Support unit 10; Support base 11; Positioning groove 12; Positioning surface 13; Positioning line 14; Base 15; Adjustment groove 16; Locking element 17; Limiting unit 20; Limiting plate 21; Limiting ball 22; Enclosure 23; Limiting ring 24; Magnetic suction part 25; Measuring unit 30; Telescopic measuring gauge 31; Telescopic measuring head 32; Cross shaft 40; Machining groove 50; First included angle α1; Second included angle α2. Detailed Implementation

[0029] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0030] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0031] In the runout detection of the journal end face of the cross shaft 40, existing detection devices typically use two support seats 11 with V-grooves to support the corresponding journals of the cross shaft 40. A limiting plate 21 abuts against the journal end face of the cross shaft 40 to provide an axial positioning reference. During the detection process, the cross shaft 40 rotates around its own axis, and the detection component collects the runout data of the journal end face. Due to the combined effects of various factors such as part machining form and position errors, on-site assembly accuracy deviations, and wear caused by long-term equipment operation, the contact working surface of the limiting plate 21 is prone to angular deviation, making it impossible to maintain a strictly perpendicular state with the center line connecting the two V-grooves. When the line connecting the limiting plate 21 and the two V-grooves is not perpendicular, the contact point between the journal end face and the limiting plate 21 of the cross shaft 40 will periodically shift in the axial direction during rotation, which will cause the cross shaft 40 to move axially as a whole. The displacement of this axial movement will be directly added to the end face detection data and cannot be distinguished from the runout deviation of the journal end face itself. Ultimately, this will interfere with the accuracy of the detection results and make it difficult to ensure the stability of the detection accuracy.

[0032] In this embodiment, as Figure 1 , Figure 2 As shown, a detection device for the runout of the journal end face of a cross shaft 40 is provided. The detection device includes a support unit 10, a limiting unit 20 and a measuring unit 30.

[0033] The support unit 10 includes two support bases 11. For example... Figure 7 As shown, the top of the support base 11 is provided with a positioning groove 12, which includes two positioning surfaces 13. The tops of the two positioning surfaces 13 are spaced apart, and their bottoms intersect to form a positioning line 14. The positioning lines 14 on the two support bases 11 are collinear. This allows the positioning surfaces 13 on the two support bases 11 to provide stable radial support for the journal of the cross shaft 40, ensuring the radial positioning accuracy and rotational coaxiality of the cross shaft 40 during its rotation around its own axis.

[0034] The limiting unit 20 includes a limiting plate 21 and a limiting ball 22, with a gap between the limiting plate 21 and the support base 11. This allows the limiting ball 22 to make point contact with the machining groove 50 of the journal, and the limiting ball 22 to also make point contact with the limiting plate 21, which can effectively counteract the assembly deviation caused by the tilt of the limiting plate 21 and weaken the impact of the angular deviation of the limiting plate 21 on the detection process.

[0035] The extension line of positioning line 14 intersects perpendicularly with the limiting plate 21 to ensure that the contact force between the limiting plate 21 and the limiting ball 22 and the journal is as uniform as possible, reducing the impact of contact force deviation on the test results. The limiting ball 22 and the limiting plate 21 are set separately. The separate structure can adapt to the different specifications of the cross shaft 40 and adjust the support height, improving the adaptability and applicability of the device.

[0036] The measuring unit 30 is located on the side of the support unit 10 away from the limiting unit 20. The measuring unit 30 includes a telescopic gauge 31, the axis of which is perpendicular to the limiting plate 21. The axis of the telescopic gauge 31's telescopic probe 32 is offset from the symmetrical planes of the two positioning surfaces 13 of the positioning groove 12. This allows the telescopic gauge 31 to completely collect the height fluctuation data of the entire circumference of the journal end face, ensuring the comprehensiveness of the test data. The telescopic gauge 31 can be a dial indicator or a micrometer indicator; the appropriate indicator can be selected based on the jump value of the measuring end.

[0037] When the cross shaft 40 is positioned on the detection device, the circumferential surfaces of the two journals of the cross shaft 40 are respectively engaged in the corresponding positioning grooves 12. The limiting ball 22 abuts against the machining groove 50 and the limiting plate 21 on one of the journal end faces of the cross shaft 40. The telescopic probe 32 of the telescopic gauge 31 abuts against the other journal end face of the cross shaft 40. The machining groove 50 is coaxially set with the journal on which it is located, which can ensure the coaxiality of the axial positioning reference and the journal axis, and provide a stable positioning reference for end face runout detection.

[0038] When the cross shaft 40 is positioned on the detection device, the cross shaft 40 is rotated around the axis of the journal in the positioning groove 12 to detect the change in the extension distance of the extension probe 32 of the extension gauge 31, so as to characterize the runout of the journal end face of the cross shaft 40.

[0039] In this embodiment, a limiting ball 22, separately disposed from the limiting plate 21, is provided in the limiting unit 20. The limiting ball 22 abuts against the machining groove 50 on one end face of the journal of the cross shaft 40 and the limiting plate 21, forming a point contact engagement between the limiting ball 22 and the machining groove 50 of the journal, and simultaneously forming a point contact engagement between the limiting ball 22 and the limiting plate 21. The two support seats 11 support the two journals of the cross shaft 40, and the telescopic gauge 31 abuts against the end face of the other journal of the cross shaft 40. This ensures that the line connecting the limiting plate 21 and the positioning line 14 is perpendicular, and the separately disposed limiting ball 22 can adaptively adjust its support height according to different specifications of the cross shaft 40. This avoids axial movement of the cross shaft 40 during the rotation detection process around the axis, ensuring that the change in telescopic distance collected by the telescopic probe 32 of the telescopic gauge 31 corresponds only to the runout of the journal end face itself. Ultimately, this solves the problem of axial movement of the cross shaft 40 caused by the skewness of the limit plate 21, which interferes with the accuracy of the detection results, and effectively improves the accuracy of the cross shaft 40 journal end face runout detection and the reliability of the detection results.

[0040] Furthermore, such as Figure 3As shown, the limiting unit 20 also includes a retaining wall 23. The retaining wall 23 is annular and located on the side of the limiting plate 21 facing the support unit 10. The retaining wall 23 is connected to the limiting plate 21, and this connection can be either fixed or detachable. The axis of the retaining wall 23 is perpendicular to the limiting plate 21, and the limiting ball 22 is located inside the retaining wall 23. By forming a circumferential spatial constraint on the outer periphery of the limiting ball 22 through the annular retaining wall 23, the radial movement range of the limiting ball 22 can be limited, preventing the limiting ball 22 from falling off due to the failure of the contact force of the journal end face after the cross shaft 40 measurement, and ensuring that the limiting ball 22 is always in an effective mating position.

[0041] It is worth noting that the inner diameter of the enclosure 23 is larger than the diameter of the limiting ball 22, and the axial length of the enclosure 23 is larger than the radius of the limiting ball 22.

[0042] Furthermore, such as Figure 3 As shown, the positioning line 14 is horizontally positioned. The limiting unit 20 also includes a limiting ring 24. The limiting ring 24 is fixedly connected to the enclosure 23, and the limiting ring 24 is located on the side of the enclosure 23 away from the limiting plate 21. The limiting ring 24 and the enclosure 23 are coaxial. The limiting ball 22 is located between the limiting plate 21 and the limiting ring 24, and the inner diameter of the limiting ring 24 is smaller than the diameter of the limiting ball 22.

[0043] It should be understood that by setting the limiting ring 24, whose inner diameter is smaller than that of the limiting ball 22, on the side of the enclosure 23 away from the limiting plate 21, a physical blocking structure can be formed at the axial opening end of the enclosure 23. In conjunction with the circumferential limiting effect of the enclosure 23, the axial exit path of the limiting ball 22 is blocked, further preventing the limiting ball 22 from falling off.

[0044] In other embodiments, such as Figure 4 As shown, the end of the positioning line 14 near the limiting plate 21 is inclined downwards, and the end near the measuring unit 30 is inclined upwards. The vertical downward projection of the center of the limiting ball 22 falls on the inner circumferential surface of the enclosure 23.

[0045] It should be understood that by setting the positioning lines 14 to an inclined arrangement, and limiting the vertical projection of the center of the limiting ball 22 to fall within the inner circumferential surface of the enclosure 23, after the journal inspection of the cross shaft 40 is completed and the contact force between the journal end face and the limiting ball 22 is released, the limiting ball 22 can remain within the constrained space of the enclosure 23 under its own gravity, preventing the limiting ball 22 from falling, being lost, or being damaged by impact. This structure eliminates the need for the limiting ring 24 to axially block the limiting ball 22, increasing the vertical adjustment margin of the limiting ball 22. This allows it to adapt to the clamping and inspection needs of cross shaft 40 workpieces with different journal specifications and dimensional parameters, effectively expanding the testing and adaptation range of the cross shaft 40 and improving the workpiece compatibility and applicable scenario coverage of the inspection device.

[0046] Furthermore, such as Figure 5 As shown, the angle between the positioning line 14 and the horizontal plane is the first angle α1. The inner circumferential surface of the enclosure 23 is a conical surface, and the angle between the generatrix of the inner circumferential surface of the enclosure 23 and its own axis is the second angle α2. The first angle α1 is greater than the second angle α2. By setting the inner circumferential surface of the enclosure 23 to a conical shape, and making the first angle α1 corresponding to the positioning line 14 greater than the second angle α2 corresponding to the generatrix of the conical surface, when the cross shaft 40 is kept in an inclined clamping state with the inclined positioning line 14, the inner circumferential surface of the conical surface can provide sufficient space for the movement of the limiting ball 22, avoiding the spatial restriction caused by the straight wall enclosure 23 structure on the position adjustment of the limiting ball 22. This structure can maintain the circumferential constraint on the limiting ball 22, preventing the limiting ball 22 from falling out of the enclosure 23, and can further widen the movable range of the limiting ball 22, increasing the size range of the cross shaft 40 that the detection device can adapt to.

[0047] Furthermore, such as Figure 3 As shown, the limiting unit 20 also includes a magnetic suction part 25. The magnetic suction part 25 is connected to the limiting plate 21, and the magnetic suction part 25 has a magnetic attraction force on the limiting ball 22. By applying a magnetic attraction force to the limiting ball 22 through the magnetic suction part 25 connected to the limiting plate 21, the limiting ball 22 can be limited by adsorption constraint. After the journal detection of the cross shaft 40 is completed and the contact force between the journal end face and the limiting ball 22 is released, it is still within the constraint space of the enclosure 23, preventing the limiting ball 22 from falling, being lost, or being damaged by impact.

[0048] Furthermore, the magnetic attraction part 25 is located below the axis of the enclosure 23. By placing the magnetic attraction part 25 below the axis of the enclosure 23, the area of ​​action of the magnetic attraction force can be biased towards the lower part of the limiting ball 22. Combined with the gravity of the limiting ball 22 itself, the downward attraction and constraint effect on the limiting ball 22 is enhanced.

[0049] Furthermore, such as Figure 6 As shown, the support unit 10 also includes a base 15. The support base 11 and the base 15 are detachably connected, and the distance between the two support bases 11 is adjustable. This detachable connection structure facilitates the disassembly, replacement, and routine maintenance of the support base 11, allowing for the replacement of support bases 11 with different specifications of positioning grooves 12 according to testing requirements. The adjustable distance between the two support bases 11 allows for flexible adjustment of the span between the two support points, adapting to cross shaft 40 workpieces with different journal spacings. This ensures a stable overlap between the positioning groove 12 and the journal of the cross shaft 40, thereby improving the workpiece adaptability range of the testing device and meeting the end face runout testing requirements of multiple specifications of cross shaft 40.

[0050] Furthermore, such as Figure 6As shown, the base 15 is provided with an adjustment groove 16. One end of the adjustment groove 16 extends toward the limiting unit 20, and the other end extends toward the measuring unit 30. A sliding adjustment guide path is provided for the support base 11 along the limiting unit 20, allowing the two support bases 11 to adjust their relative spacing along the extension direction of the adjustment groove 16, adapting to cross shaft 40 workpieces with different journal spans. The support unit 10 also includes a locking element 17. The locking element 17 passes through the adjustment groove 16, and the support base 11 is fixed relative to the base 15 by the locking element 17. The locking element 17, in conjunction with the locking element passing through the adjustment groove 16, locks the position of the support base 11, reliably fixing the support base 11 to the base 15 after the spacing adjustment is completed, preventing the support base 11 from shifting position during the testing process. This ensures both flexible adjustment of the support spacing and stability of the support positioning and consistency of the testing reference. The locking element 17 can be a screw or nut.

[0051] Furthermore, the extension direction of the adjustment groove 16 is parallel to the positioning line 14. By keeping the extension direction of the adjustment groove 16 parallel to the positioning line 14, the positioning lines 14 on the two support seats 11 can always remain collinear during the process of sliding the support seat 11 along the adjustment groove 16 to adjust the spacing. This can stably maintain the coaxial accuracy of the support positioning, avoid the problem of the positioning line 14 shifting or misaligning after the position of the support seat 11 is adjusted, and at the same time, there is no need to adjust the height and angle of the positioning groove 12, simplifying the adjustment operation of the support spacing, ensuring the rotational coaxiality of the cross shaft 40 after clamping, and ensuring the consistency of the end face runout detection benchmark.

[0052] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A device for detecting runout of the end face of a cross shaft journal, characterized in that, The detection device includes: The support unit includes two support bases; the top of each support base is provided with a positioning groove; the positioning groove includes two positioning surfaces; the tops of the two positioning surfaces are spaced apart, and their bottoms intersect to form a positioning line; the positioning lines on the two support bases are collinear. The limiting unit includes a limiting plate and a limiting ball; the limiting plate has a gap with the support base; the extension line of the positioning line intersects the limiting plate perpendicularly; the limiting ball and the limiting plate are separately disposed. A measuring unit is located on the side of the support unit away from the limiting unit; the measuring unit includes a telescopic measuring gauge; the axis of the telescopic measuring gauge's telescopic probe intersects the limiting plate perpendicularly; the axis of the telescopic measuring gauge's telescopic probe is offset from the symmetrical planes of the two positioning surfaces of the positioning groove; With the cross shaft positioned on the detection device, the circumferential surfaces of the two journals of the cross shaft respectively overlap in the corresponding positioning grooves. The limiting ball abuts between the machining groove on one end face of the journal of the cross shaft and the limiting plate. The telescopic probe of the telescopic gauge abuts against the other end face of the journal of the cross shaft. The machining groove is coaxially arranged with the journal on which it is located. When the cross shaft is positioned on the detection device, the cross shaft is rotated around the axis of the journal in the positioning groove to detect the change in the extension distance of the telescopic probe of the telescopic gauge, so as to characterize the runout of the journal end face of the cross shaft.

2. The detection device for runout of the end face of a cross shaft journal according to claim 1, characterized in that, The limiting unit further includes a barrier; the barrier is ring-shaped; the barrier is located on the side of the limiting plate facing the supporting unit; the barrier is connected to the limiting plate; the axis of the barrier is perpendicular to the limiting plate; and the limiting ball is located inside the barrier.

3. The detection device for runout of the end face of a cross shaft journal according to claim 2, characterized in that, The positioning line is horizontally set; the limiting unit also includes a limiting ring; the limiting ring is fixedly connected to the enclosure; the limiting ring is located on the side of the enclosure away from the limiting plate; the limiting ring is coaxial with the enclosure; the limiting ball is located between the limiting plate and the limiting ring; the inner diameter of the limiting ring is smaller than the diameter of the limiting ball.

4. The detection device for runout of the end face of a cross shaft journal according to claim 2, characterized in that, The positioning line is inclined downward at the end near the limiting plate and upward at the end near the measuring unit; the vertical downward projection of the center of the limiting ball falls on the inner circumferential surface of the enclosure.

5. The detection device for runout of the end face of a cross shaft journal according to claim 4, characterized in that, The angle between the positioning line and the horizontal plane is the first angle; the inner circumferential surface of the enclosure is a conical surface; the angle between the generatrix of the inner circumferential surface of the enclosure and its own axis is the second angle; the first angle is greater than the second angle.

6. The detection device for runout of the end face of a cross shaft journal according to claim 2, characterized in that, The limiting unit further includes a magnetic suction part; the magnetic suction part is connected to the limiting plate; the magnetic suction part has a magnetic attraction force on the limiting ball.

7. The detection device for runout of the end face of a cross shaft journal according to claim 6, characterized in that, The magnetic attraction part is located below the axis of the enclosure.

8. The detection device for runout of the end face of a cross shaft journal according to claim 1, characterized in that, The support unit also includes a base; the support base is detachably connected to the base; the distance between the two support bases is adjustable.

9. The detection device for runout of the end face of a cross shaft journal according to claim 8, characterized in that, The base is provided with an adjustment groove; one end of the adjustment groove extends toward the limiting unit and the other end extends toward the measuring unit; the support unit also includes a locking member; the locking member passes through the adjustment groove; the support base is fixed relative to the base by the locking member.

10. The detection device for runout of the end face of a cross shaft journal according to claim 9, characterized in that, The adjustment groove extends parallel to the positioning line.

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