Method and device for detecting a cross axle outer ring

Abstract

The application relates to the technical field of cross shafts, in particular to a detection method and device for a cross shaft outer ring. The telescopic measuring needle of a measuring table is limited at a position higher than a positioning plate; a cushion block is placed in the cross shaft outer ring; the opening end of the cross shaft outer ring is upward and the snap spring groove is clamped on the positioning plate, so that the cross shaft outer ring is hung on the positioning plate; based on the fact that the cross shaft outer ring is hung on the positioning plate and the cushion block is located in the cross shaft outer ring, the height limitation of the telescopic measuring needle is removed, so that the telescopic measuring needle freely falls until abutting against the upper surface of the cushion block; based on the fact that the telescopic measuring needle of the measuring table abuts against the cushion block, the height difference between the snap spring groove and the inner bottom wall of the outer ring body is calculated according to the reading of the measuring table, and the detection is completed; thus, the problem that the cross shaft outer ring cannot simultaneously position the axial positions of the inner bottom wall and the snap spring groove and measure the interval is solved.

Description

Technical Field

[0001] This application relates to the field of cross shaft technology, and more specifically, to a method and apparatus for detecting the outer ring of a cross shaft. Background Technology

[0002] The cross shaft outer ring consists of an outer ring body and a snap ring groove. The outer ring body is cylindrical, closed at one end and open at the other. The inner side of the closed end forms a flat inner bottom wall, which serves as the axial support surface for the cross shaft, bearing axial forces. The open end is the assembly inlet for the inner cavity, allowing the cross shaft to be inserted into the inner cavity of the outer ring body from this end. The snap ring groove is a continuous annular groove structure, circumferentially arranged on the outer peripheral wall surface of the outer ring body, mainly used for embedding matching snap ring components. In the machining and quality inspection of the cross shaft outer ring, the axial distance between the inner bottom wall of the outer ring body and the snap ring groove is a core control dimension. The machining accuracy of this dimension directly affects the subsequent assembly effect; therefore, this distance parameter must be accurately measured during the production process.

[0003] Because the two measurement references for this distance are located in different structural areas of the part, the inner bottom wall is located at the inner cavity bottom of the closed end of the outer ring body, which is an internal surface of the part, and its accurate axial position cannot be directly determined from the outside of the part; the snap ring groove is located on the outer peripheral wall of the outer ring body, which is an external surface of the part, and there is no directly shared measurement reference surface between the two. Conventional dimensional inspection tools can only complete the dimensional measurement of a single outer surface or a single inner surface, and cannot simultaneously locate the axial position of the inner bottom wall and the snap ring groove and calculate the distance. Summary of the Invention

[0004] To address the problem that the outer ring of a cross shaft cannot simultaneously locate the axial position of the inner bottom wall and the retaining ring groove and calculate the distance, this application provides a method and apparatus for detecting the outer ring of a cross shaft.

[0005] Firstly, this application provides a method for detecting the outer ring of a cross shaft, the detection method comprising:

[0006] The telescopic probe of the measuring instrument is restricted to a position higher than the positioning plate; wherein the lower part of the positioning plate is suspended.

[0007] Place the pad inside the outer ring of the cross shaft; wherein, the outer ring of the cross shaft includes an outer ring body and a retaining spring groove; the retaining spring groove is disposed on the outer peripheral wall of the outer ring body;

[0008] With the open end of the outer ring of the cross shaft facing upwards and the retaining ring groove engaged with the positioning plate, the outer ring of the cross shaft is suspended from the positioning plate.

[0009] Based on the fact that the outer ring of the cross shaft is suspended from the positioning plate and the pad is located inside the outer ring of the cross shaft, the height restriction of the telescopic probe is released so that the telescopic probe can fall freely until it abuts the upper surface of the pad.

[0010] The telescopic probe of the measuring instrument abuts against the pad, and the height difference between the retaining ring groove and the inner bottom wall of the outer ring body is calculated based on the reading of the measuring instrument, thus completing the test.

[0011] Optionally, the pad is columnar; one end face of the pad is a mating end face; a receiving groove is provided on the mating end face; the receiving groove extends radially along the pad;

[0012] The step of placing the pad inside the outer ring of the cross shaft includes:

[0013] The pad is placed inside the outer ring of the cross shaft so that the mating end face fits against the inner bottom wall of the outer ring of the cross shaft;

[0014] The pad is rotated by a preset angle around the axis of the outer ring of the cross shaft to scrape the impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove.

[0015] Optionally, rotating the pad about the axis of the outer ring of the cross shaft by a preset angle to scrape impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove includes:

[0016] The pad is rotated alternately along the first and second rotation directions by the preset angle to scrape the impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove; wherein the first and second rotation directions are opposite.

[0017] Optionally, multiple receiving grooves are distributed around the axis of the pad;

[0018] The preset angle is less than 180°.

[0019] Optionally, when the pad is placed inside the outer ring of the cross shaft, the pad protrudes from the open end face of the outer ring body;

[0020] The detection method further includes:

[0021] After the test is completed, move the outer ring of the cross shaft horizontally away from the positioning plate until the outer ring of the cross shaft disengages from the positioning plate and the pad disengages from the telescopic probe of the measuring instrument.

[0022] Optionally, when the pad is placed inside the outer ring of the cross shaft, at least a portion of the outer peripheral wall of the pad is in contact with the inner peripheral wall of the outer ring of the cross shaft; the area where the outer peripheral wall of the pad is in contact with the inner peripheral wall of the outer ring of the cross shaft is a close contact area.

[0023] As the outer ring of the cross shaft moves horizontally away from the positioning plate, the path traversed by the telescopic probe on the upper surface of the pad passes above the adjacent area.

[0024] Secondly, this application provides a detection device for the outer ring of a cross shaft, applied to the detection method for the outer ring of a cross shaft as described in any one of the first aspects; the detection device includes:

[0025] Positioning frame;

[0026] A positioning plate is connected to the positioning frame; the positioning plate is horizontally positioned; the bottom of the positioning plate is suspended; the vertical projection of the positioning plate has an arc-shaped outline.

[0027] A measuring instrument is connected to the positioning frame; the measuring instrument includes a measuring body and a telescopic probe; the telescopic probe is slidably connected to the measuring body; the telescopic probe is vertically arranged; the telescopic probe is located above the positioning plate;

[0028] A pad is used to be placed inside the outer ring of the cross shaft; the outer ring of the cross shaft includes an outer ring body and a retaining ring groove; the retaining ring groove is disposed on the outer peripheral wall of the outer ring body; the radius of curvature of the arc-shaped contour line is adapted to the radius of the retaining ring groove so that one end of the positioning plate having the arc-shaped contour line can be inserted into the retaining ring groove.

[0029] Optionally, the pad is columnar; one end face of the pad is a mating end face; a receiving groove is provided on the mating end face; the receiving groove extends radially along the pad;

[0030] The receiving grooves are distributed in multiple ways around the axis of the pad.

[0031] Optionally, the inner bottom wall of the outer ring of the cross shaft has a raised annular positioning surface;

[0032] The accommodating groove has a width dimension in the circumferential direction of the pad block; the width dimension of the accommodating groove gradually increases from the axis of the pad block towards the outer peripheral wall.

[0033] Optionally, the receiving groove has a first clearance surface and a second clearance surface; the first clearance surface and the second clearance surface intersect.

[0034] The mating end face is also provided with a central groove; the central groove is located at the center of the mating end face; and the plurality of receiving grooves are connected to the central groove.

[0035] Optionally, the diameter of the pad is adapted to the inner diameter of the outer ring of the cross shaft, so that the outer peripheral wall of the pad can fit against the inner peripheral wall of the outer ring of the cross shaft;

[0036] A vent groove is formed on the outer peripheral wall of the spacer block; the vent groove penetrates through both end faces of the spacer block.

[0037] To solve the problem that the cross shaft outer ring cannot simultaneously position the axial positions of the inner bottom wall and the snap ring groove and measure the distance therebetween, the present application has the following advantages:

[0038] By transmitting the axial position of the inner bottom wall of the outer ring body to the open end side of the cross shaft outer ring via the spacer block, and simultaneously converting the axial position of the snap ring groove into a positioning reference at the positioning plate, the two measurement references originally located inside and outside the cross shaft outer ring respectively are both incorporated into the same axial measurement system, so as to complete the transmission of the reference position and the alignment of the measurement references. Then, the telescopic measuring probe freely falls until it abuts against the upper surface of the spacer block, and the reading of the measuring gauge is used to calculate the height difference between the snap ring groove and the inner bottom wall of the outer ring body. The originally unmeasurable distance between the inner and outer structures can be converted into a dimensional parameter that can be directly read and measured by the measuring gauge, thereby completing the quantitative detection of the corresponding distance of the cross shaft outer ring, and finally solving the problem that the distance from the inner bottom wall of the outer ring body to the snap ring groove is difficult to directly detect, ensuring the implementability of the detection operation and the accuracy of the detection result. Brief Description of the Drawings

[0039] Figure 1 shows a flowchart of the detection method for the cross shaft outer ring according to the first embodiment;

[0040] Figure 2 shows an axonometric view of the detection device for the cross shaft outer ring according to the second embodiment;

[0041] Figure 3 shows Figure 2 an axonometric view of the assembly of the cross shaft outer ring and the spacer block of the detection device;

[0042] Figure 4 shows Figure 3 a sectional view of the cross shaft outer ring and the spacer block;

[0043] Figure 5 shows a top view of the spacer block of the detection device for the cross shaft outer ring according to the second embodiment;

[0044] Figure 6 shows an axonometric view of the cross shaft outer ring according to the second embodiment.

[0045] Reference numerals in the drawings: positioning frame 10; positioning plate 20; measuring gauge 30; measuring body 31; telescopic measuring probe 32; spacer block 40; matching end face 41; accommodating groove 42; first avoiding surface 43; second avoiding surface 44; central groove 45; vent groove 46; cross shaft outer ring 50; outer ring body 51; snap ring groove 52; annular positioning surface 53. Detailed Description of the Embodiments

[0046] 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.

[0047] 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.

[0048] In the dimensional quality inspection of the outer ring 50 of the cross shaft, it is necessary to check the distance between the inner bottom wall of the outer ring body 51 and the snap ring groove 52. The inner bottom wall of the outer ring body 51 is located at the bottom end of the internal cavity of the outer ring 50 of the cross shaft, which is the internal closed end face of the part, and its accurate axial position cannot be directly determined from the outside of the part. The snap ring groove 52 is set on the outer peripheral wall of the outer ring body 51, which is an annular groove structure on the outside of the part. The two measurement references are located in the internal and external areas of the part, respectively, and there is no directly shared measurement reference surface. Conventional dimensional inspection tools can only complete the dimensional measurement of a single outer surface or a single inner surface, and cannot simultaneously locate the axial position of the inner bottom wall and the outer snap ring groove 52 and calculate the distance between them.

[0049] Example 1:

[0050] In this embodiment, a method for detecting the outer ring 50 of a cross shaft is provided, the method including steps S10 to S50. Figure 1 As shown, the detection method for the outer ring 50 of the cross shaft is performed sequentially through steps S10, S20, S30, S40, and S50.

[0051] Step S10 involves positioning the telescopic probe 32 of the measuring instrument 30 above the positioning plate 20. This step pre-determines the initial height of the telescopic probe 32, reserving operating space for the subsequent clamping of the crosshair outer ring 50. The area below the positioning plate 20 is suspended.

[0052] Step S20: Place the pad 40 inside the cross shaft outer ring 50. This step uses the pad 40 to transmit the axial position of the inner bottom wall of the outer ring body 51 to the open end, transforming the internal reference into a measuring surface that can be contacted from the open end. The cross shaft outer ring 50 includes an outer ring body 51 and a retaining ring groove 52, which is located on the outer peripheral wall of the outer ring body 51.

[0053] In step S30, the open end of the cross shaft outer ring 50 is oriented upwards and the snap ring groove 52 is engaged with the positioning plate 20, so that the cross shaft outer ring 50 is suspended from the positioning plate 20. This step converts the axial position of the snap ring groove 52 into a fixed reference at the positioning plate 20, while keeping the cross shaft outer ring 50 in a stable suspended state.

[0054] In step S40, based on the cross shaft outer ring 50 being suspended from the positioning plate 20 and the pad 40 being located inside the cross shaft outer ring 50, the height restriction of the telescopic probe 32 is released, so that the telescopic probe 32 can fall freely until it abuts against the upper surface of the pad 40.

[0055] In step S50, based on the telescopic probe 32 of the measuring instrument 30 abutting against the pad 40, the height difference between the snap ring groove 52 and the inner bottom wall of the outer ring body 51 is calculated according to the reading of the measuring instrument 30, and the detection is completed. This step, through the position transmission of the pad 40 and the reference positioning of the positioning plate 20, can unify and convert the two measurement references inside and outside the cross shaft outer ring 50, realize the quantitative detection of the height difference between the snap ring groove 52 and the inner bottom wall of the outer ring body 51, and solve the problem that the distance between the inner bottom wall of the outer ring body 51 and the snap ring groove 52 is difficult to directly detect.

[0056] This embodiment transmits the axial position of the inner bottom wall of the outer ring body 51 to the open end of the cross shaft outer ring 50 via the pad 40, while simultaneously converting the axial position of the snap ring groove 52 into a positioning reference at the positioning plate 20. This integrates the two measurement references, originally located inside and outside the cross shaft outer ring 50 respectively, into the same axial measurement system, completing the transmission of reference positions and alignment of measurement references. Then, the telescopic probe 32 falls freely until it abuts against the upper surface of the pad 40. The reading of the measuring instrument 30 calculates the height difference between the snap ring groove 52 and the inner bottom wall of the outer ring body 51. This transforms the previously unmeasurable internal and external structural spacing into a dimensional parameter that can be directly read and calculated by the measuring instrument 30, thereby completing the quantitative detection of the corresponding spacing of the cross shaft outer ring 50. Ultimately, this solves the problem of the difficulty in directly detecting the spacing between the inner bottom wall of the outer ring body 51 and the snap ring groove 52, ensuring the feasibility of the detection operation and the accuracy of the detection results.

[0057] Furthermore, the pad 40 is columnar, adapting to the inner cavity structure of the cross shaft outer ring 50, ensuring the axial stability of the pad 40 after placement. One end face of the pad 40 is a mating end face 41, which can form surface contact with the inner bottom wall of the cross shaft outer ring 50, ensuring the accuracy of axial position transmission of the inner bottom wall. A receiving groove 42 is provided on the mating end face 41, which extends radially along the pad 40, providing a space for accommodating oil stains on the surface of the inner bottom wall, reducing the possibility of oil stains accumulating between the mating end face 41 and the inner bottom wall.

[0058] Step S20 includes steps S21 and S22.

[0059] Step S21: Place the pad 40 inside the outer ring 50 of the cross shaft so that the mating end face 41 fits against the inner bottom wall of the outer ring 50 of the cross shaft. This step achieves the initial alignment of the pad 40 and the inner bottom wall.

[0060] Step S22 involves rotating the pad 40 around the axis of the outer ring 50 of the cross shaft by a preset angle to scrape impurities on the inner bottom wall of the outer ring 50 into the receiving groove 42. This step uses rotational scraping to collect oil and impurities from the inner bottom wall surface into the receiving groove 42, eliminating the problem of excessive height caused by oil and impurities leading to an overestimation of the overall spacing measurement value. This ensures the accuracy of the axial position of the pad 40 and ultimately improves the measurement accuracy of the test results.

[0061] Further, step S22 includes step S221.

[0062] In step S221, the pad 40 is rotated alternately along the first and second rotation directions by a preset angle to scrape impurities on the inner bottom wall of the cross shaft outer ring 50 into the receiving groove 42. The first and second rotation directions are opposite.

[0063] This step employs a bidirectional alternating rotation method, which scrapes and collects oil and impurities from the inner bottom wall surface from two opposite directions. This reduces the possibility of some impurities being unable to enter the receiving groove 42 due to synchronous circumferential displacement with the pad 40 during single-direction rotation. It ensures that all oil on the inner bottom wall of the cross shaft outer ring 50 enters the receiving groove 42, enabling the mating end face 41 to fit tightly with the inner bottom wall. This eliminates height deviations caused by impurities, further ensuring the accuracy of axial position transmission of the pad 40 and improving the precision and reliability of height difference detection results.

[0064] Furthermore, multiple receiving grooves 42 are distributed around the axis of the pad 40, with a preset angle of less than 180°. The multiple receiving grooves 42 distributed circumferentially around the pad 40 can expand the coverage area for scraping oil and impurities during a single rotation. Combined with the preset rotation angle of less than 180°, the sweeping range of the receiving grooves 42 can cover the entire inner bottom wall area corresponding to the mating end face 41 of the pad 40, ensuring that the entire mating surface is scraped and cleaned, avoiding localized oil and impurity residues that could cause height errors, thereby effectively improving the accuracy of height difference detection.

[0065] Furthermore, with the pad 40 placed inside the outer ring 50 of the cross shaft, the pad 40 protrudes from the open end face of the outer ring body 51. This allows the upper surface of the pad 40 to be located outside the open end face of the outer ring body 51, enabling the telescopic probe 32 of the measuring instrument 30 to complete the contact measurement without extending into the inner cavity of the outer ring body 51, thus reserving radial clearance space for the part removal process.

[0066] The detection method also includes step S60. The detection method for the outer ring 50 of the cross shaft is performed sequentially through steps S10, S20, S30, S40, S50, and S60.

[0067] Step S60: After the test is completed, move the outer ring 50 of the cross shaft away from the positioning plate 20 in the horizontal direction until the outer ring 50 of the cross shaft is disengaged from the positioning plate 20 and the pad 40 is disengaged from the telescopic probe 32 of the measuring instrument 30.

[0068] It should be understood that the pad 40 protrudes from the open end face of the outer ring body 51, allowing the upper surface of the pad 40 to be located outside the open end face of the outer ring body 51. This enables the telescopic probe 32 of the measuring instrument 30 to complete the contact measurement without extending into the inner cavity of the outer ring body 51, thus reserving radial clearance space for the part removal process. Separating the cross shaft outer ring 50 from the positioning plate 20 and the pad 40 from the telescopic probe 32 via horizontal movement avoids collision and interference between the telescopic probe 32 and the end face of the cross shaft outer ring 50 during vertical part removal, reducing the possibility of damage to the telescopic probe 32 and the cross shaft outer ring 50, and ensuring the stability of the testing operation and the service life of the components.

[0069] Furthermore, with the pad 40 placed inside the outer ring 50 of the cross shaft, at least a portion of the outer peripheral wall of the pad 40 adheres to the inner peripheral wall of the outer ring 50. The area where the outer peripheral wall of the pad 40 adheres to the inner peripheral wall of the outer ring 50 is called the close contact area. As the outer ring 50 of the cross shaft moves horizontally away from the positioning plate 20, the path traversed by the telescopic probe 32 on the upper surface of the pad 40 passes above the close contact area.

[0070] It should be understood that the close-fitting arrangement of the contact area provides radial restraint for the pad 40, ensuring its positional stability within the outer ring 50 of the cross shaft and preventing radial movement of the pad 40 as it moves horizontally with the outer ring. Simultaneously, by limiting the sliding path of the telescopic probe 32 to the area above the contact area, the probe always aligns with the gap-free region between the pad 40 and the inner circumferential wall of the outer ring 50 of the cross shaft during horizontal disengagement. This reduces the probability of the telescopic probe 32 falling into the gap between the outer ring 50 of the cross shaft and the pad 40, further improving the component's service life and reducing the risk of component damage.

[0071] Example 2:

[0072] In this embodiment, a detection device for the outer ring 50 of a cross shaft is applied to a method for detecting the outer ring 50 of a cross shaft. For example... Figure 2 As shown, the testing device includes a positioning frame 10, a positioning plate 20, a measuring gauge 30, and a pad 40.

[0073] The positioning frame 10 serves as the overall load-bearing base of the testing device, providing a stable installation and positioning foundation for the other functional components.

[0074] The positioning plate 20 is connected to the positioning frame 10. The positioning plate 20 is horizontally positioned and suspended below. The vertical projection of the positioning plate 20 has an arc-shaped contour. The horizontally positioned positioning plate 20 can provide a uniform axial positioning reference, and the suspended structure below can provide sufficient vertical clearance space for the suspension assembly of the cross shaft outer ring 50.

[0075] The measuring instrument 30 is connected to the positioning frame 10. The measuring instrument 30 includes a measuring body 31 and a telescopic probe 32. The telescopic probe 32 is slidably connected to the measuring body 31 and is vertically positioned above the positioning plate 20. The telescopic probe 32, which can extend and retract vertically, can accurately transmit axial position changes, enabling stable reading and output of dimensional values ​​in conjunction with the measuring body 31.

[0076] like Figure 3 As shown, the pad 40 is placed inside the outer ring 50 of the cross shaft. The outer ring 50 of the cross shaft includes an outer ring body 51 and a retaining ring groove 52. The retaining ring groove 52 is located on the outer peripheral wall of the outer ring body 51. The pad 40 can transmit the axial position of the inner bottom wall of the outer ring body 51 to the open end, transforming the measurement reference inside the outer ring 50 of the cross shaft into an external measurement surface that can be contacted from the open end. The radius of curvature of the arc-shaped contour line is adapted to the radius of the retaining ring groove 52 so that the end of the positioning plate 20 with the arc-shaped contour line can be inserted into the retaining ring groove 52. It should be understood that by adapting and engaging the arc-shaped contour line with the retaining ring groove 52, the outer ring 50 of the cross shaft can be stably suspended on the positioning plate 20, completing the reference transformation of the axial position of the retaining ring groove 52. With the help of the measuring gauge 30 and the pad 40, the detection operation of the corresponding spacing can be realized.

[0077] Furthermore, such as Figure 4 , Figure 5 As shown, the pad 40 is cylindrical, thus fitting the inner cavity structure of the cross shaft outer ring 50 and ensuring the axial stability of the pad 40 after placement. One end face of the pad 40 is a mating end face 41, which can form surface contact with the inner bottom wall of the cross shaft outer ring 50, achieving precise transmission of the axial position of the inner bottom wall. A receiving groove 42 is provided on the mating end face 41, extending radially along the pad 40. This groove can collect oil and impurities from the surface of the inner bottom wall, preventing impurities from accumulating between the mating end face 41 and the inner bottom wall, thus avoiding additional height. Multiple receiving grooves 42 are distributed around the axis of the pad 40, increasing the volume for oil collection, expanding the impurity scraping coverage area during pad 40 rotation, ensuring precise contact between the inner bottom wall of the cross shaft outer ring 50 and the end face of the pad 40, and avoiding errors in the test results.

[0078] Furthermore, such as Figure 6As shown, the inner bottom wall of the cross shaft outer ring 50 has a raised annular positioning surface 53. The raised annular positioning surface 53 can serve as a contact reference for the mating end face 41 of the pad 40, defining the placement position of the pad 40 on the inner bottom wall and ensuring the accuracy of the axial position transmission of the pad 40.

[0079] The circumferential dimension of the receiving groove 42 on the pad 40 is its width, which gradually increases from the axis of the pad 40 towards the outer peripheral wall. This structure, where the width of the receiving groove 42 gradually increases radially outward, fully utilizes the space on the end face of the pad 40, increasing the volume of the receiving groove 42 and enhancing its capacity to hold oil and impurities. This allows impurities scraped off by the rotating pad 40 to be smoothly collected within the receiving groove 42, preventing them from accumulating between the mating end face 41 and the annular positioning surface 53 and creating additional height, thus ensuring the accuracy of the test results.

[0080] Furthermore, the receiving groove 42 has a first clearance surface 43 and a second clearance surface 44. The first clearance surface 43 and the second clearance surface 44 intersect to form the side wall of the receiving groove 42, forming a stable impurity receiving space. When the pad block 40 rotates, it can scrape and guide the oil and impurities on the inner bottom wall surface, so that the impurities can be smoothly collected into the inside of the receiving groove 42.

[0081] The mating end face 41 is also provided with a central groove 45, which is located at the center of the mating end face 41. Multiple receiving grooves 42 are connected to the central groove 45. The central groove 45 can reduce the machining area of ​​the mating end face 41 of the pad 40, reduce the workload of end face machining, and at the same time adapt to the annular positioning surface 53 structure of the inner bottom wall of the cross shaft outer ring 50, so that the corresponding area of ​​the central groove 45 does not need to abut against the inner bottom wall, ensuring effective contact between the mating end face 41 and the annular positioning surface 53. In addition, the structure of the receiving grooves 42 connected to the central groove 45 can further expand the oil contaminant holding space, allowing oil contaminants in the receiving grooves 42 to flow into the central groove 45 for storage, improving the overall impurity holding capacity, avoiding the accumulation of oil contaminants and impurities between the mating end face 41 and the annular positioning surface 53 to form a height deviation, and ensuring the accuracy of the test results.

[0082] Furthermore, such as Figure 4 As shown, the diameter of the pad 40 is adapted to the inner diameter of the cross shaft outer ring 50 so that the outer peripheral wall of the pad 40 can fit against the inner peripheral wall of the cross shaft outer ring 50. This size adaptation structure can form a radial limit on the pad 40, ensuring that the pad 40 remains coaxial with the cross shaft outer ring 50 after it is installed, avoiding radial displacement of the pad 40, and ensuring the stability and accuracy of axial position transmission.

[0083] like Figure 5As shown, the outer peripheral wall of the pad 40 is provided with a venting groove 46, which extends to both ends of the pad 40. Through the venting groove 46 extending to both ends of the pad 40, the closed air between the pad 40 and the inner bottom wall of the outer ring body 51 can be discharged outwards along the venting groove 46 during the process of installing the pad 40 into the cross shaft outer ring 50. This avoids air stagnation creating pressure resistance that makes it difficult to press the pad 40 down and completely fit the inner bottom wall, ensuring smooth assembly and proper fit of the pad 40, and further improving the reliability of the test results.

[0084] 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 method for detecting the outer ring of a cross shaft, characterized in that, The detection method includes: The telescopic probe of the measuring instrument is restricted to a position higher than the positioning plate; wherein the lower part of the positioning plate is suspended. Place the pad inside the outer ring of the cross shaft; wherein, the outer ring of the cross shaft includes an outer ring body and a retaining spring groove; the retaining spring groove is disposed on the outer peripheral wall of the outer ring body; With the open end of the outer ring of the cross shaft facing upwards and the retaining ring groove engaged with the positioning plate, the outer ring of the cross shaft is suspended from the positioning plate. Based on the fact that the outer ring of the cross shaft is suspended from the positioning plate and the pad is located inside the outer ring of the cross shaft, the height restriction of the telescopic probe is released so that the telescopic probe can fall freely until it abuts the upper surface of the pad. The telescopic probe of the measuring instrument abuts against the pad, and the height difference between the retaining ring groove and the inner bottom wall of the outer ring body is calculated based on the reading of the measuring instrument, thus completing the test; The pad is columnar; one end face of the pad is a mating end face; a receiving groove is provided on the mating end face; the receiving groove extends radially along the pad. The step of placing the pad inside the outer ring of the cross shaft includes: The pad is placed inside the outer ring of the cross shaft so that the mating end face fits against the inner bottom wall of the outer ring of the cross shaft; The pad is rotated by a preset angle around the axis of the outer ring of the cross shaft to scrape the impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove.

2. The method for detecting the outer ring of a cross shaft according to claim 1, characterized in that, The step of rotating the pad block around the axis of the outer ring of the cross shaft by a predetermined angle to scrape impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove includes: The pad is rotated alternately along the first and second rotation directions by the preset angle to scrape the impurities on the inner bottom wall of the outer ring of the cross shaft into the receiving groove; wherein the first and second rotation directions are opposite.

3. The method for detecting the outer ring of a cross shaft according to claim 1, characterized in that, The receiving grooves are distributed in multiple ways around the axis of the pad block; The preset angle is less than 180°.

4. The method for detecting the outer ring of a cross shaft according to claim 3, characterized in that, With the pad placed inside the outer ring of the cross shaft, the pad protrudes from the open end face of the outer ring body; The detection method further includes: After the test is completed, move the outer ring of the cross shaft horizontally away from the positioning plate until the outer ring of the cross shaft disengages from the positioning plate and the pad disengages from the telescopic probe of the measuring instrument.

5. The method for detecting the outer ring of a cross shaft according to claim 4, characterized in that, With the pad placed inside the outer ring of the cross shaft, at least a portion of the outer peripheral wall of the pad is in contact with the inner peripheral wall of the outer ring of the cross shaft; the area where the outer peripheral wall of the pad is in contact with the inner peripheral wall of the outer ring of the cross shaft is a close contact area. As the outer ring of the cross shaft moves horizontally away from the positioning plate, the path traversed by the telescopic probe on the upper surface of the pad passes above the adjacent area.

6. A detection device for the outer ring of a cross shaft, applied to the detection method for the outer ring of a cross shaft according to any one of claims 1-5; characterized in that, The detection device includes: Positioning frame; A positioning plate is connected to the positioning frame; the positioning plate is horizontally positioned; the bottom of the positioning plate is suspended; the vertical projection of the positioning plate has an arc-shaped outline. A measuring instrument is connected to the positioning frame; the measuring instrument includes a measuring body and a telescopic probe; the telescopic probe is slidably connected to the measuring body; the telescopic probe is vertically arranged; the telescopic probe is located above the positioning plate; A pad is used to be placed inside the outer ring of the cross shaft; the outer ring of the cross shaft includes an outer ring body and a retaining ring groove; the retaining ring groove is disposed on the outer peripheral wall of the outer ring body; the radius of curvature of the arc-shaped contour line is adapted to the radius of the retaining ring groove so that one end of the positioning plate having the arc-shaped contour line can be inserted into the retaining ring groove; The pad is columnar; one end face of the pad is a mating end face; a receiving groove is provided on the mating end face; the receiving groove extends radially along the pad.

7. The detection device for the outer ring of a cross shaft according to claim 6, characterized in that, The receiving grooves are distributed in multiple ways around the axis of the pad.

8. The detection device for the outer ring of a cross shaft according to claim 7, characterized in that, The inner bottom wall of the outer ring of the cross shaft has a raised annular positioning surface; The accommodating groove has a width dimension in the circumferential direction of the pad block; the width dimension of the accommodating groove gradually increases from the axis of the pad block towards the outer peripheral wall.

9. The detection device for the outer ring of a cross shaft according to claim 8, characterized in that, The receiving groove has a first clearance surface and a second clearance surface; the first clearance surface and the second clearance surface intersect. The mating end face is also provided with a central groove; the central groove is located at the center of the mating end face; and the plurality of receiving grooves are connected to the central groove.

10. The detection device for the outer ring of a cross shaft according to claim 6, characterized in that, The diameter of the pad is adapted to the inner diameter of the outer ring of the cross shaft so that the outer peripheral wall of the pad can fit against the inner peripheral wall of the outer ring of the cross shaft. The outer peripheral wall of the pad has ventilation grooves; the ventilation grooves extend to both ends of the pad.

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