Device and method for measuring radial clearance of bearing

Abstract

The invention discloses a device for measuring the radial clearance of a bearing, and the device comprises a pedestal and a detachable main seat body, and the main seat body comprises a vertical plate and a transverse plate. The vertical plate is provided with a clamping assembly, the assembly is provided with a bearing seat, a detachable station piece, a pressing rod with a flange and a fast-assembly gland, the transverse plate is provided with a slidable measuring meter, the base is provided with a jacking assembly, and the assembly comprises a shaft sleeve, a flat-end mandrel, a reset spring and a rotating piece with symmetrical double inclined planes; the measuring method comprises the following steps: calibrating equipment by using a standard bearing with the same model, then installing and clamping the bearing to be measured, adjusting the measuring meter to zero, driving the flat-end mandrel to jack the inner ring by the rotating piece to measure the reading, averaging multi-point measurement, and comparing with the standard to judge that the bearing is qualified. The equipment is high in modularization, the station changing part is matched with multiple types of bearings, jacking transmission is stable, and clamping operation is efficient; the measurement method is calibrated and multi-point valuing is carried out, precision and credibility are improved, debugging is convenient, and the method is suitable for being used in multiple scenes.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and in particular to a device and method for measuring the radial clearance of a bearing. Background Technology

[0002] Deep groove ball bearings possess advantages such as low coefficient of friction, high limiting speed, simple structure, convenient installation, and high load-bearing capacity. They can withstand radial loads or combined radial and axial loads, making them suitable for high-speed rotation and applications requiring low noise and low vibration. They are widely used in instrumentation, motors, household appliances, aerospace, and other fields. Radial clearance, a crucial characteristic of deep groove ball bearings, ensures effective lubrication between the rolling elements and the inner and outer rings, reducing friction and wear. It directly affects the bearing's load distribution, vibration, noise, friction, temperature rise, service life, and mechanical operating accuracy, playing a vital role in ensuring normal bearing operation and extending its service life.

[0003] The radial clearance of a deep groove ball bearing refers to the arithmetic mean of the radial distance that the outer ring moves relative to the inner ring from one radial eccentric limit position to the opposite limit position when the bearing is not under external load.

[0004] Chinese invention patent CN118209071A discloses a high-precision, wide-range bearing radial clearance measurement device and method, including a granite worktable, frame, loading component, drive component, zero-position sensor, precision ball bearing system, clearance measurement component, and bearing fixture. This invention addresses the problem of large detection errors caused by limited detection points in static testing devices used in single-machine or automated assembly lines. Through programming, the drive component and loading component enable the rotation of the inner ring of the bearing under test and the automatic application of upper and lower loads to the outer ring. A displacement sensor probe acting on the outer circumference of the bearing's outer ring enables dynamic, multi-point, high-precision automatic measurement of the radial clearance of radial bearings. Furthermore, by modifying the shaft end structure of the precision ball bearing system and replacing the measuring mandrel, retaining ring, and other fixtures, a large-range radial clearance measurement of radial bearings can be achieved on a single instrument.

[0005] However, these high-precision measuring devices, due to the integration of a variety of complex and precise components, generally suffer from drawbacks such as large size, high cost, and complex programming, making them difficult to deploy flexibly and operate conveniently in scenarios such as workshops, which is not conducive to their widespread application in a wider range of bearing production and maintenance testing scenarios.

[0006] Therefore, in order to meet the demand for rapid and economical testing of radial clearance of deep groove ball bearings in workshops and other scenarios, developing a simple, compact, low-cost, and easy-to-operate measuring device has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] This invention addresses the problems of existing high-precision bearing radial clearance measuring devices being bulky, expensive, and having complex programming, making them difficult to apply flexibly in the workshop. It provides a device and method for measuring bearing radial clearance that is simple, compact, low-cost, and easy to operate.

[0008] This invention provides the following technical solution: A device for measuring the radial clearance of a bearing, comprising a base, a main body detachably connected to the base, the main body including a vertical plate and a horizontal plate detachably connected to the upper end of the vertical plate, a clamping assembly mounted on the vertical plate, a measuring gauge mounted on the horizontal plate, and a lifting assembly mounted on the base; the clamping assembly includes a bearing housing for mounting the bearing to be measured, the bearing to be measured being sleeved on a stationary component of the bearing housing; the measuring gauge is inserted into an insertion hole on the horizontal plate, forming a vertical sliding fit with the insertion hole, the lower end of the measuring gauge corresponding to the bearing to be measured, the lifting assembly being located directly below the stationary component, the lifting assembly including a lifting seat, and a vertically penetrating accommodating cavity provided at the central axis of the lifting seat. The cavity contains a bushing, and the bushing has a vertically penetrating guide cavity at its central axis. A flat-headed spindle is inserted into the upper section of the guide cavity, and a return spring is built into the lower section. A rotating component that can rotate around its central axis is fitted onto the upper end of the bushing. The lower end face of the rotating component has a guide slope. A limiting elongated hole is opened on the side wall of the bushing, and a connecting hole is opened on the side wall of the flat-headed spindle. A moving rod is inserted into the connecting hole. When the flat-headed spindle is housed in the guide cavity, the moving rod is inserted into the limiting elongated hole and the connecting hole in sequence. The moving rod abuts against the guide slope, and the return spring abuts against the lower end face of the flat-headed spindle. When the rotating component is rotated, the guide slope forms a vertical guide for the rotating rod, which, together with the return spring, drives the flat-headed spindle to rise and fall vertically relative to the bushing.

[0009] In some embodiments, the clamping assembly includes a clamping operating rod, a pressing rod, and a pressure cap. The pressing rod has a connecting threaded portion and a pressing portion. The clamping operating rod is located near the connecting threaded portion. The bearing housing has an internal thread adapted to the connecting threaded portion. The pressing rod is screwed to one end of the bearing housing through the connecting threaded portion. The pressure cap is installed on the pressing portion. The stationary component is installed at the end of the bearing housing near the pressing portion. The pressing portion passes through the bearing housing and the stationary component in sequence. When the bearing to be tested is sleeved on the stationary component, rotating the clamping operating rod can drive the pressing rod to move the pressure cap to press the bearing to be tested.

[0010] In some embodiments, the end wall of the clamping part is provided with a flange, and the cover includes a disassembly groove. The cover is installed on the clamping part through the disassembly groove. The cover is located inside the flange. When the clamping rod drives the cover to press the bearing to be tested, the inner end face of the flange abuts against the outer end face of the cover.

[0011] In some embodiments, the workstation has an external threaded connection portion, and the bearing housing has an internal thread adapted to the external threaded connection portion. The workstation is detachably connected to the bearing housing through the external threaded connection portion. A blocking portion protrudes outward in the circumferential direction from the side wall of the workstation. When the bearing to be tested is sleeved on the workstation, the inner side wall surface of the bearing to be tested abuts against the wall surface of the blocking portion.

[0012] In some embodiments, the rotating component includes an annular body with a notch on its lower end face and a guide slope at the notch. The guide slope includes a first slope and a second slope. The first slope connects the inner wall of one circumferential end of the annular body to the lower end face, and the second slope connects the inner wall of the other circumferential end of the annular body to the lower end face. Both the first slope and the second slope are inclined downwards in a clockwise direction along the annular body, with the same inclination direction and the same inclination angle. The first slope and the second slope are located on both sides of the notch, and are arranged opposite each other along the circumferential direction of the annular body, forming a symmetrical distribution in the radial direction of the annular body.

[0013] In some embodiments, a lifting operating rod is connected to the side wall of the rotating component.

[0014] In some embodiments, the lifting assembly includes a tightening member, the base has a tightening hole at the lifting seat, the tightening member extends into the guide cavity through the tightening hole, the lower end face of the flat-head spindle has a first protrusion at the center axis, the upper end face of the tightening member has a second protrusion at the center axis, and the two ends of the return spring are respectively sleeved on the first protrusion and the second protrusion.

[0015] In some embodiments, the bushing is threadedly installed in the adjusting hole, and the adjusting element is threadedly installed in the guide cavity.

[0016] A method for measuring the radial clearance of a bearing includes the following steps: S1, Equipment calibration: Select a standard-sized bearing of the same model as the bearing to be tested, with known radial clearance and conforming to the standard, as a reference piece. Place the standard bearing on the stationary part of the measuring equipment, install the pressure cap and clamp it in place. Adjust the measuring dial indicator until the dial indicator head is in stable contact with the upper surface of the outer ring of the standard bearing and the pointer returns to zero. Rotate the rotating part of the measuring equipment to lift the inner ring of the standard bearing and record the reading A. After resetting, record the reading B. If the error between the reading A and the known radial clearance value of the standard bearing is within the allowable range of the equipment accuracy, the equipment calibration is deemed qualified; S2, Bearing installation: Hold the bearing to be tested and smoothly place it on the stationary part, ensuring that the inner ring of the bearing fits tightly against the outer wall of the stationary part without offset or skew, and that the outer ring of the bearing hangs naturally without interfering with other components; S3, Clamping and fixing the bearing to be tested: Drive the clamping rod along the bearing housing axially using the clamping operating rod, so that the bearing installed on the clamping part... The pressure cap fits tightly against the outer ring end face of the bearing to be tested, clamping the bearing to be tested onto the workpiece; S4, Measuring gauge position adjustment: Vertically insert the calibrated measuring gauge into the insertion hole of the horizontal plate, slide the measuring gauge until the gauge head makes slight contact with the upper surface of the outer ring of the bearing to be tested, fix the measuring gauge position, and adjust the pointer to the zero mark; S5, Radial clearance measurement operation: Rotate the rotating part clockwise to drive the flat-head mandrel to lift the inner ring of the bearing to be tested upward, and record the reading A after the measuring gauge pointer deflects steadily; Rotate the rotating part counterclockwise to reset the flat-head mandrel, and record the reading B after the measuring gauge pointer returns to the center; S6, Measurement data processing and result judgment: If the reading B of each measurement point is within the allowable range of the measuring gauge accuracy, the radial clearance value of each measurement point is the corresponding reading A. Calculate the arithmetic mean of the radial clearance values ​​of all measurement points as the final measurement result, and compare the final measurement result with the allowable range of the radial clearance standard corresponding to the bearing model to determine whether the bearing radial clearance is qualified.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] I. High degree of modularity, significantly improved adaptability, maintainability and portability: This invention adopts a multi-dimensional detachable connection design, in which the main body and base are detachable, the vertical plate and horizontal plate are detachable, and the workstation parts and bearing seats are detachable by threads. On the one hand, it solves the problem of high maintenance costs and overall repair required when integrated equipment components are damaged in the prior art, allowing for the replacement of faulty parts individually. On the other hand, by replacing the workstation parts that are compatible with different bearing specifications, it is possible to measure multiple types of bearings without replacing the entire set of equipment. This breaks through the limitation of the prior art that the equipment can only be adapted to a single type of bearing, greatly improving the applicability of the equipment. At the same time, the detachable and streamlined overall structure of the equipment can meet the needs of multiple scenarios such as laboratory, workshop, and outdoor maintenance.

[0019] II. Stable Lifting Component Transmission and Controllable Source of Measurement Error: Compared to existing lifting structures that are prone to fluctuations in lifting force and transmission jamming, the lifting component of this invention adopts a collaborative structure of "symmetrical double inclined plane - moving rod - return spring": The symmetrical inclined plane can form a continuous and uniform vertical guiding force when the rotating part rotates clockwise, avoiding the displacement of the moving rod caused by single-point force; The return spring is precisely positioned through the first protrusion and the second protrusion to ensure consistent return stroke, and can flexibly adjust the preload with the tightening component. This design can achieve stable lifting and precise return of the flat-head spindle to the inner ring of the bearing, reducing measurement deviations caused by unstable lifting from the source and improving the controllability of the measurement process.

[0020] III. Highly efficient clamping assembly operation and more reliable bearing protection: Existing technologies often suffer from cumbersome cap installation and difficulty in controlling clamping force. This invention addresses these issues by incorporating a disassembly groove in the cap, allowing for quick alignment and installation of the clamping part without complex positioning. The flange of the clamping part provides an inner limit to the cap, preventing clamping imbalance caused by cap misalignment. The use of threaded drive, with the threaded part of the clamping rod engaging with the internal thread of the bearing housing, allows for precise adjustment of the clamping force by rotating the clamping operating rod. This ensures stable bearing clamping while preventing bearing deformation due to excessive clamping, balancing operational efficiency and bearing protection.

[0021] IV. Systematized Measurement Methods, High Accuracy and Reliability of Results: The measurement method of this invention overcomes the shortcomings of existing technologies such as "direct measurement without calibration" and "insufficient representativeness of single-point measurement". On the one hand, a "standard bearing calibration" step is added to correct the systematic error of the equipment in advance by using a standard bearing of the same model as the bearing to be tested, ensuring that the equipment is in a precise measurement state. On the other hand, at least three evenly distributed measurement points are selected in the circumference of the bearing, and the arithmetic mean is taken by multiple measurements to effectively offset the local error of a single measurement point, such as the deviation caused by local wear of the outer ring of the bearing, so that the final measurement result is closer to the true radial clearance of the bearing and improves the reliability of the data.

[0022] V. More Convenient Equipment Debugging and Long-Term Use: The threaded connection design of the tensioning component, bushing, and base in the lifting assembly allows for flexible adjustment of the reset spring preload by rotating the tensioning component, adapting to the lifting requirements of bearings of different weights. This avoids the problem of fixed spring preload and diminished reset effect after long-term use in existing technologies. At the same time, the vertical sliding fit between the measuring instrument and the horizontal plate insertion hole allows for quick adjustment and fixation of the instrument head position, simplifying the operation steps and lowering the barrier to entry for operators. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0026] Figure 3 This is a cross-sectional view of the lifting assembly of the present invention;

[0027] Figure 4 This is a cross-sectional view of the clamping assembly of the present invention;

[0028] Figure 5 This is a schematic diagram of the lifting assembly of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the bushing and rotating component of the present invention.

[0030] Figure 7 This is a schematic diagram of the structure of the bushing and rotating component from another angle.

[0031] Figure 8 This is a schematic diagram of the rotating component of the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of the flat-head mandrel and the moving rod of the present invention.

[0033] In the diagram: 1. Base; 11. Adjusting hole; 2. Main body; 21. Vertical plate; 22. Horizontal plate; 221. Insertion hole; 222. Deformation groove; 3. Clamping assembly; 31. Bearing seat; 311. Internal thread; 32. Station part; 321. External thread connection part; 322. Blocking part; 33. Clamping operating rod; 34. Pressure rod; 341. Connecting thread part; 342. Pressure part; 343. Flange; 35. Pressure cap; 351. Disassembly groove; 36. Fastening bolt; 37. Fastening nut; 4. Measuring gauge; 41. Gauge head; 5. Lifting assembly; 51. Lifting base; 511. Receiving cavity; 512. Guide groove; 52. Bushing; 521. Guide cavity; 522. Limiting elongated hole; 53. Flat-headed spindle; 531. Connecting hole; 532. First protrusion; 54. Return spring; 55. Rotating component; 551. Annular body; 552. Notch; 553. First inclined surface; 554. Second inclined surface; 56. Moving rod; 57. Lifting operating rod; 58. Adjusting component; 581. Second protrusion. Detailed Implementation

[0034] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0037] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0039] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0040] Please see Figure 1-3As shown in this embodiment: a device for measuring the radial clearance of a bearing includes a base 1, a main body 2 detachably connected to the base 1, the main body 2 including a vertical plate 21 and a horizontal plate 22 detachably connected to the upper end of the vertical plate 21, a clamping assembly 3 installed on the vertical plate 21, a measuring gauge 4 installed on the horizontal plate 22, and a lifting assembly 5 installed on the base 1; the clamping assembly 3 includes a bearing seat 31 for mounting the bearing to be tested, the bearing to be tested being sleeved on a stationary part 32 of the bearing seat 31; the measuring gauge 4 is inserted into a insertion hole 221 on the horizontal plate 22 and forms a vertical sliding fit with the insertion hole 221, the lower end of the measuring gauge 4, the gauge head 41, is correspondingly set with the bearing to be tested, the lifting assembly 5 is located directly below the stationary part 32, the lifting assembly 5 includes a lifting seat 51, a vertically penetrating receiving cavity 511 is provided at the central axis of the lifting seat 51, and the receiving cavity 511 contains a shaft. The bushing 52 has a vertically penetrating guide cavity 521 at its central shaft. A flat-headed spindle 53 is inserted into the upper section of the guide cavity 521, and a return spring 54 is built into the lower section. A rotating component 55 that can rotate around its central shaft is fitted onto the upper end of the bushing 52. A guide slope is provided on the lower end face of the rotating component 55. A limiting elongated hole 522 is opened on the side wall of the bushing 52. A connecting hole 531 is opened on the side wall of the flat-headed spindle 53. A moving rod 56 is inserted into the connecting hole 531. When the flat-headed spindle 53 is housed in the guide cavity 521, the moving rod 56 is inserted into the limiting elongated hole 522 and the connecting hole 531 in sequence. The moving rod 56 abuts against the guide slope, and the return spring 54 abuts against the lower end face of the flat-headed spindle 53. When the rotating component 55 is rotated, the guide slope forms a vertical guide for the rotating rod, which, together with the return spring 54, drives the flat-headed spindle 53 to rise and fall vertically relative to the bushing 52.

[0041] It should be noted that the upright plate 21 is installed on the base 1 by bolt connection, and the upright plate 21 and the horizontal plate 22 are also fixed by bolt connection.

[0042] It should be noted that: the horizontal plate 22 is provided with a deformation groove 222, the inner end of the deformation groove 222 is connected to the insertion hole 221, and also includes a fastening bolt 36 and a fastening nut 37. Two opposing clamping arms are formed on both sides of the deformation groove 222. The two clamping arms are solid parts on the horizontal plate 22 located on both sides of the deformation groove 222 and have a certain elastic deformation capability. The fastening bolt 36 is inserted into the two clamping arms along the extension direction perpendicular to the deformation groove 222. The fastening nut 37 is threaded to the end of the screw of the fastening bolt 36. The two are used to tighten or loosen the two clamping arms.

[0043] In some embodiments, such as Figure 4As shown, the clamping assembly 3 includes a clamping operating rod 33, a clamping rod 34, and a pressure cap 35. The clamping rod 34 has a connecting threaded portion 341 and a clamping portion 342. The clamping operating rod 33 is located near the connecting threaded portion 341. The bearing housing 31 has an internal thread 311 that is adapted to the connecting threaded portion 341. The clamping rod 34 is screwed to one end of the bearing housing 31 through the connecting threaded portion 341. The pressure cap 35 is installed on the clamping portion 342. The stationary component 32 is installed on the end of the bearing housing 31 near the clamping portion 342, and the clamping portion 342 passes through... The system includes a bearing housing 31 and a workstation 32. When the bearing to be tested is fitted onto the workstation 32, rotating the clamping operating rod 33 drives the clamping rod 34 to press the pressure cap 35 against the bearing. It should be noted that this clamping structure design ensures the reliability and practicality of bearing radial clearance measurement in several ways: Firstly, the clamping rod 34 is screwed to the bearing housing 31 via a connecting thread 341. The threaded connection has good self-locking properties. After rotating the clamping operating rod 33 drives the pressure cap 35 to press the bearing, axial displacement of the bearing during measurement is avoided, ensuring accuracy and reliability. First, the gauge head 41 of the measuring instrument 4 always maintains a stable correspondence with the bearing to be measured, directly ensuring the accuracy of the radial clearance measurement data. Second, the pressure cap 35 is installed on the clamping part 342 of the clamping rod 34 and directly contacts the bearing to be measured. Compared with the clamping part 342 acting directly on the bearing, the pressure cap 35 can increase the contact area with the bearing, effectively dispersing the clamping force and preventing excessive local pressure from causing deformation or damage to precision components such as bearing rolling elements and inner and outer rings. It is especially suitable for measuring vulnerable parts such as thin-walled bearings and precision bearings. Third, the clamping operating rod 33 is close to... The threaded connection 341 is designed to meet the principle of labor-saving operation, and the thread adjustment method allows for fine adjustment of the clamping force. This not only allows for flexible control of the clamping degree according to the bearing material, avoiding overpressure damage, but also adapts to bearings with different inner diameters and thicknesses, eliminating the need for frequent replacement of clamping accessories and improving equipment adaptability. Fourth, the assembly structure of the pressure cap 35 and the clamping part 342, and the clamping rod 34 and the bearing seat 31 is simple. Loosening the clamping operating rod 33 allows for quick removal of the pressure cap 35 and replacement of the bearing to be tested, making operation convenient, reducing measurement interval time, and improving testing efficiency.

[0044] In some embodiments, such as Figure 4As shown, the end wall of the clamping part 342 is provided with a flange 343. The cover 35 includes a disassembly groove 351. The cover 35 is installed on the clamping part 342 through the disassembly groove 351. The cover 35 is located inside the flange 343. When the clamping rod 34 drives the cover 35 to clamp the bearing to be tested, the inner end face of the flange 343 abuts against the outer end face of the cover 35. It should be noted that the abutment between the inner end face of the flange 343 and the outer end face of the cover 35 can restrict the cover 35 from detaching outward along the axial direction of the clamping part 342 when the clamping rod 34 drives the cover 35 to clamp the bearing. This ensures that the cover 35 and the clamping rod 34 move synchronously and avoids the cover 35 from being misaligned or falling off due to the reaction force of the bearing during the measurement process. This ensures that the clamping force is stably transmitted to the bearing under test, providing a basic guarantee for measurement accuracy. The cover 35 is directly installed on the clamping part 342 through the disassembly groove 351 without the need for additional connecting parts. When the cover 35 needs to be replaced due to wear from long-term use, or when it needs to be replaced to match bearings of different sizes, simply loosen the clamping rod 34 and let the cover 35 come out along the disassembly groove 351 without disassembling the entire clamping rod 34, which greatly shortens the maintenance and replacement time. The cover 35 is limited by the flange 343, which eliminates the need for additional fixing structure design, reduces the number of parts and assembly complexity, and avoids clamping failure caused by loose additional connecting parts, thus improving the overall reliability of the equipment.

[0045] In some embodiments, such as Figure 4 As shown, the workstation component 32 has an external threaded connection portion 321, and the bearing housing 31 has an internal thread 311 adapted to the external threaded connection portion 321. The workstation component 32 is detachably connected to the bearing housing 31 through the external threaded connection portion 321. A blocking portion 322 protrudes outward circumferentially from the side wall of the workstation component 32. When the bearing to be tested is fitted onto the workstation component 32, the inner wall surface of the bearing to be tested abuts against the wall surface of the blocking portion 322. It should be noted that the workstation component 32 is detachably connected to the bearing housing 31 through the external thread, allowing for quick replacement of the workstation component 32 with a corresponding outer diameter according to the inner diameter specification of the bearing to be tested. When the bearing is being measured, the blocking part 322 can provide a unified axial positioning reference for bearings of different widths. It can meet the measurement needs of different types and sizes of bearings such as deep groove ball bearings and cylindrical roller bearings without adjusting the overall structure of the bearing housing 31. When the bearing to be measured is fitted with the station piece 32, it is only necessary to abut its inner sidewall against the blocking part 322 to complete the precise axial positioning. There is no need to repeatedly adjust the bearing position to align with the measuring table 4 head 41 or the lifting assembly 5, which greatly shortens the single clamping time. Combined with the quick disassembly and assembly characteristics of the threaded connection, the interval time between measurements of different batches of bearings is further reduced.

[0046] In some embodiments, such as Figures 5-9As shown, the rotating component 55 includes an annular body 551, with a notch 552 on the lower end face of the annular body 551, and a guide slope is provided at the notch 552. The guide slope includes a first slope 553 and a second slope 554. The first slope 553 connects the inner sidewall of one circumferential end of the annular body 551 to the lower end face, and the second slope 554 connects the inner sidewall of the other circumferential end of the annular body 551 to the lower end face. Both the first slope 553 and the second slope 554 are inclined downwards along the clockwise direction of the annular body 551, with the same inclination direction and the same inclination angle. The first slope 553 and the second slope 554 are located on both sides of the notch 552, and both are inclined downwards along the annular body 551. The 51 are arranged circumferentially opposite each other and symmetrically distributed in the radial direction of the annular body 551. It should be noted that the first inclined surface 553 and the second inclined surface 554 are symmetrically distributed in the radial direction of the annular body 551 and have the same inclination angle. When rotated, they will form a "symmetrical opposite" radial component force on the moving rod 56. That is, the radial forces of the two inclined surfaces are equal in magnitude and opposite in direction, which can cancel each other out, leaving only the vertical lifting driving force. This design can prevent the flat-headed mandrel 53 from radially deviating due to unilateral force, avoid friction and jamming with the inner wall of the guide cavity 521, and ensure that the flat-headed mandrel 53 always rises and falls smoothly in the vertical direction, providing a foundation for subsequent precise lifting of the bearing to be tested.

[0047] It should be noted that the upper end face of the lifting base 51 is provided with two guide grooves 512 for accommodating the moving rod 56. The two guide grooves 512 are symmetrically arranged about the central axis of the lifting base 51. The two ends of the moving rod 56 are respectively mounted on the two guide grooves 512, which makes the moving rod 56 more stable in the vertical direction and prevents the moving rod 56 from moving horizontally.

[0048] In some embodiments, such as Figures 5-6 As shown, a lifting operating rod 57 is connected to the side wall of the rotating part 55. It should be noted that the lifting operating rod 57 makes it easier to rotate the rotating part 55, saving the user effort.

[0049] In some embodiments, such as Figure 3As shown, the lifting assembly 5 includes a tightening component 58. The base 1 has a tightening hole 11 at the lifting seat 51. The tightening component 58 passes through the tightening hole 11 and extends into the guide cavity 521. A first protrusion 532 is provided at the center axis of the lower end face of the flat-head spindle 53, and a second protrusion 581 is provided at the center axis of the upper end face of the tightening component 58. The two ends of the return spring 54 are respectively sleeved on the first protrusion 532 and the second protrusion 581. It should be noted that the first protrusion 532 and the second protrusion 581 form a dual positioning of "axial limit + radial constraint" for the return spring 54, effectively preventing the spring from tilting or shifting during extension and retraction, ensuring that the spring force always acts vertically on the flat-head spindle 53, avoiding radial swaying of the spindle due to uneven force, ensuring its straightness during lifting and lowering, and laying the foundation for stable lifting of the bearing under test. On the other hand, the tightening component 58 can be adjusted by rotation to change its... The distance between the upper end face and the lower end face of the flat-head mandrel 53 allows for flexible adjustment of the compression and preload of the return spring 54. This provides sufficient preload for heavy-duty bearing measurements to ensure reliable mandrel return, while also reducing preload for light-duty and precision bearings to avoid impact damage, significantly improving the equipment's adaptability to bearings with different characteristics. Simultaneously, the double-protrusion design eliminates the need for additional fasteners when assembling the return spring 54; simply fitting it into place completes the positioning. When replacing a fatigued spring, only loosening the adjusting component 58 is required, eliminating the need to disassemble the entire lifting seat 51, significantly simplifying maintenance and saving time. Furthermore, the fixing function of the adjusting component 58 and the positioning function of the double protrusions ensure stable spring extension and contraction strokes and elastic force output, ensuring consistent starting positions for each return of the flat-head mandrel 53, avoiding measurement benchmark fluctuations, and improving the repeatability and reliability of multiple measurements of the same bearing.

[0050] In some embodiments, such as Figures 5-9 As shown, the bushing 52 is threaded into the adjusting hole 11, and the adjusting component 58 is threaded into the guide cavity 521. It should be noted that this double-layer threaded assembly structure has significant advantages: it fixes the bushing 52 and the adjusting component 58 with the self-locking characteristic of the threads, preventing loosening and displacement during measurement to ensure structural stability; it also allows for fine adjustment of the initial lifting reference of the flat-head spindle 53 by rotating the bushing 52, adapting to bearings of different heights, and adjustment of the preload of the return spring 54 by rotating the adjusting component 58, adapting to bearings of different weights or precisions, forming a dual fine adjustment that does not interfere with each other; at the same time, the centering effect of the threaded engagement ensures that the bushing 52, the adjusting component 58, and the flat-head spindle 53 are coaxial, preventing spindle jamming, and the threaded assembly and disassembly are convenient, allowing maintenance of components without damaging the overall structure, greatly improving equipment adaptability and maintenance convenience.

[0051] It should be noted that: the rotating part 55 is mounted on the moving rod 56. By separating the lifting assembly 5 from the base 1 and unscrewing the bushing 52 from the base 1, the bushing 52 can be pulled out of the receiving cavity 511 of the lifting seat 51. The adjusting part 58 can be unscrewed into the guide cavity 521 of the bushing 52, and the moving rod 56 can be pulled out. This allows for the disassembly of the flat-head spindle 53 and the rotating part 55, making installation and disassembly convenient and quick.

[0052] A method for measuring the radial clearance of a bearing includes the following steps: S1, Equipment calibration operation: Select a standard-sized bearing with the same model as the bearing to be tested, known radial clearance, and conforming to the standard as a reference piece. Place the standard bearing on the station part 32 of the measuring equipment, install the pressure cover 35 and clamp it in place. Adjust the measuring gauge 4 until the gauge head 41 is in stable contact with the upper surface of the outer ring of the standard bearing and the pointer is zero. Rotate the rotating part 55 of the measuring equipment to lift the inner ring of the standard bearing and record the reading A. After resetting, record the reading B. If the error between the reading A and the known radial clearance value of the standard bearing is within the allowable range of the equipment accuracy, the equipment calibration is deemed qualified; S2, Bearing installation: Hold the bearing to be tested and smoothly place it on the station part 32, ensuring that the inner ring of the bearing fits tightly against the outer wall of the station part 32 without offset or skew, and that the outer ring of the bearing hangs naturally without interfering with other components; S3, Clamping and fixing the bearing to be tested: Drive the clamping rod 34 along the bearing seat 31 axially by the clamping operating rod 33, so that the pressure cover installed on the clamping part 342... 35. Tightly fit the outer ring end face of the bearing to be tested, clamp the bearing to be tested onto the station part 32; S4. Adjust the position of measuring gauge 4: Vertically insert the calibrated measuring gauge 4 into the insertion hole 221 of the horizontal plate 22, slide the measuring gauge 4 so that the gauge head 41 makes slight contact with the upper surface of the outer ring of the bearing to be tested, fix the position of the measuring gauge 4 and adjust the pointer to the zero mark; S5. Radial clearance measurement operation: Rotate the rotating part 55 clockwise to drive the flat-head spindle 53 to lift the inner ring of the bearing to be tested upward, and wait for the pointer of the measuring gauge 4 to deflect steadily. Record reading A after setting; rotate rotating part 55 counterclockwise to reset flat-head spindle 53, and record reading B after the pointer of measuring table 4 returns to center; S6, Measurement data processing and result judgment: If the reading B of each measurement point is within the allowable range of the accuracy of measuring table 4, the radial clearance value of each measurement point is the corresponding reading A. Calculate the arithmetic mean of the radial clearance values ​​of all measurement points as the final measurement result. Compare the final measurement result with the allowable range of radial clearance standard corresponding to the bearing model to be tested, and determine whether the bearing radial clearance is qualified.

[0053] This measurement method, through a closed-loop process design of "calibration-clamping-measurement-judgment," comprehensively improves the accuracy and efficiency of bearing radial clearance measurement. Firstly, S1 uses a standard bearing calibration device of the same model to verify whether the reading error meets the accuracy requirements. This eliminates systemic errors in measuring equipment such as measuring gauge 4 and lifting assembly 5, establishing a precise benchmark for subsequent bearing measurements and avoiding misjudgments due to equipment deviations. Secondly, S2 and S3 clearly define clamping requirements: the inner ring fits snugly against the workstation component 32, the outer ring hangs without interference, and the pressure cap 35 is evenly tightened. This prevents bearing clamping misalignment that could cause the inner and outer rings to be misaligned, and the pressure cap 35 disperses the clamping force to prevent bearing deformation, reducing the impact of clamping deviations on measurement results from the operational source. Thirdly, S5 and S6 employ a "lifting reading + reset verification" process. The dual-reading mode of the "certification" allows recording reading B to determine whether the flat-head spindle 53 is fully reset and whether the measuring gauge 4 is calibrated. If the value of B exceeds the tolerance, it can promptly investigate operational issues such as the rotating part 55 not being reset properly or equipment issues such as the return spring 54 malfunctioning, ensuring the validity of reading A. At the same time, by averaging multiple measurement points, it can reduce the random error of a single measurement. Combined with the comparison with the standard range, it makes the judgment result more objective. Fourth, the process steps are clear and highly adaptable. From clamping S2-S3 to measuring S4-S5, there are no restrictions on specific bearing models. Only the corresponding station part 32 needs to be replaced to adapt to different specifications of bearings. The operation steps are highly standardized, and both novices and experienced personnel can quickly master them. It can meet the precision measurement needs of the laboratory and adapt to the batch testing scenarios of the production line, balancing accuracy and efficiency.

[0054] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for measuring the radial clearance of a bearing, comprising a base (1), characterized in that: The base (1) is detachably connected to a main body (2), the main body (2) includes a vertical plate (21) and a horizontal plate (22) detachably connected to the upper end of the vertical plate (21). A clamping assembly (3) is installed on the vertical plate (21), a measuring gauge (4) is installed on the horizontal plate (22), and a lifting assembly (5) is installed on the base (1). The clamping assembly (3) includes a bearing housing (31) for mounting the bearing to be tested, and the bearing to be tested is sleeved on the station part (32) of the bearing housing (31); The measuring instrument (4) is inserted into the insertion hole (221) on the horizontal plate (22) and forms a vertical sliding fit with the insertion hole (221). The lower end of the measuring instrument (4) is correspondingly set with the bearing to be measured. The lifting assembly (5) is located directly below the workstation component (32). The lifting assembly (5) includes a lifting base (51). The lifting base (51) has a vertically penetrating accommodating cavity (511) at its central axis. The accommodating cavity (511) contains a bushing (52). The bushing (52) has a vertically penetrating guide cavity (521) at its central axis. A flat-head spindle (53) is inserted into the upper section of the guide cavity (521), and a return spring (54) is built into the lower section. A rotating component (55) that can rotate around its central axis is fitted on the upper end of the bushing (52). A guide slope is provided on the lower end face of the rotating component (55). A limiting elongated hole (522) is opened on the side wall of the bushing (52). The flat-head spindle (53) has a connecting hole (531) on its side wall. A moving rod (56) is inserted into the connecting hole (531). When the flat-head spindle (53) is housed in the guide cavity (521), the moving rod (56) is sequentially inserted into the limiting elongated hole (522) and the connecting hole (531). The moving rod (56) abuts against the guide inclined surface, and the return spring (54) abuts against the lower end face of the flat-head spindle (53). When the rotating part (55) is rotated, the guide inclined surface forms a vertical guide for the rotating rod, and together with the return spring (54), it drives the flat-head spindle (53) to rise and fall vertically relative to the bushing (52).

2. The device for measuring the radial clearance of a bearing according to claim 1, characterized in that: The clamping assembly (3) includes a clamping operating rod (33), a pressing rod (34), and a pressure cap (35). The pressing rod (34) has a connecting threaded portion (341) and a pressing portion (342). The clamping operating rod (33) is located near the connecting threaded portion (341). The bearing seat (31) has an internal thread (311) that is adapted to the connecting threaded portion (341). The pressing rod (34) is screwed to the bearing seat through the connecting threaded portion (341). (31) One end; the pressure cap (35) is installed on the pressing part (342), the station part (32) is installed on the bearing seat (31) near the pressing part (342), and the pressing part (342) passes through the bearing seat (31) and the station part (32) in sequence; when the bearing to be tested is sleeved on the station part (32), rotating the clamping operating rod (33) can drive the pressing rod (34) to drive the pressure cap (35) to press the bearing to be tested.

3. The device for measuring the radial clearance of a bearing according to claim 2, characterized in that: The end side wall of the clamping part (342) is provided with a flange (343), and the cover (35) includes a disassembly groove (351). The cover (35) is installed on the clamping part (342) through the disassembly groove (351). The cover (35) is located inside the flange (343). When the clamping rod (34) drives the cover (35) to press the bearing to be tested, the inner end face of the flange (343) abuts against the outer end face of the cover (35).

4. The device for measuring the radial clearance of a bearing according to claim 2, characterized in that: The workstation component (32) has an external threaded connection (321), and the bearing housing (31) has an internal thread (311) that is adapted to the external threaded connection (321). The workstation component (32) is detachably connected to the bearing housing (31) through the external threaded connection (321). The workstation component (32) has a blocking part (322) protruding outward in the circumferential direction on its side wall. When the bearing to be tested is sleeved on the workstation component (32), the inner side wall of the bearing to be tested abuts against the wall of the blocking part (322).

5. The device for measuring the radial clearance of a bearing according to claim 2, characterized in that: The rotating component (55) includes an annular body (551), the lower end face of which is provided with a notch (552), and the guide slope is provided at the notch (552); the guide slope includes a first slope (553) and a second slope (554), the first slope (553) connects the inner sidewall of one circumferential end of the annular body (551) to the lower end face, and the second slope (554) connects the inner sidewall of the other circumferential end of the annular body (551) to the lower end face; the first slope (553) and the second slope (554) are both inclined downwards in the clockwise direction of the annular body (551), with the same inclination direction and the same inclination angle; the first slope (553) and the second slope (554) are respectively located on both sides of the notch (552), and are arranged opposite to each other in the circumferential direction of the annular body (551), and are symmetrically distributed in the radial direction of the annular body (551).

6. The device for measuring the radial clearance of a bearing according to claim 2, characterized in that: The rotating part (55) is connected to a lifting operating rod (57) on its side wall.

7. The device for measuring the radial clearance of a bearing according to claim 2, characterized in that: The lifting assembly (5) includes a tensioning member (58). The base (1) has a tensioning hole (11) at the lifting seat (51). The tensioning member (58) passes through the tensioning hole (11) and extends into the guide cavity (521). The flat-head spindle (53) has a first protrusion (532) at the center axis of its lower end face. The tensioning member (58) has a second protrusion (581) at the center axis of its upper end face. The two ends of the return spring (54) are respectively sleeved on the first protrusion (532) and the second protrusion (581).

8. The device for measuring the radial clearance of a bearing according to claim 7, characterized in that: The bushing (52) is threaded into the adjusting hole (11), and the adjusting element (58) is threaded into the guide cavity (521).

9. A method for measuring the radial clearance of a bearing, using the apparatus for measuring the radial clearance of a bearing according to any one of claims 3-8, characterized in that: Includes the following steps: S1. Equipment calibration operation: Select a standard size bearing with the same model as the bearing to be tested, known radial clearance and conforming to the standard as the reference part. Put the standard bearing on the station part (32) of the measuring equipment, install the pressure cover (35) and clamp it. Adjust the measuring instrument (4) until the instrument head (41) is in stable contact with the upper surface of the outer ring of the standard bearing and the pointer returns to zero. Rotate the rotating part (55) of the measuring equipment to lift the inner ring of the standard bearing and record the reading A. After resetting, record the reading B. If the error between the reading A and the known radial clearance value of the standard bearing is within the allowable range of the equipment accuracy, the equipment calibration is deemed qualified. S2. Installation of the bearing to be tested: Hold the bearing to be tested and smoothly place it on the work station component (32) to ensure that the inner ring of the bearing fits tightly with the outer wall of the work station component (32) without deviation or skew, and that the outer ring of the bearing hangs naturally without interfering with other components. S3, clamping and fixing the bearing to be tested: drive the clamping rod (34) to move axially along the bearing seat (31) by the clamping operating rod (33), so that the pressure cover (35) installed on the clamping part (342) is tightly fitted with the outer ring end face of the bearing to be tested, and clamp the bearing to be tested on the work station part (32). S4. Adjustment of the position of the measuring instrument (4): Insert the calibrated measuring instrument (4) vertically into the insertion hole (221) of the horizontal plate (22), slide the measuring instrument (4) so ​​that the meter head (41) makes slight contact with the upper surface of the outer ring of the bearing to be tested, fix the position of the measuring instrument (4), and adjust the pointer to the zero mark. S5. Radial clearance measurement operation: Rotate the rotating part (55) clockwise to drive the flat-head spindle (53) to lift the inner ring of the bearing to be measured. After the pointer of the measuring instrument (4) deflects steadily, record the reading A; Rotate the rotating part (55) counterclockwise to reset the flat-head spindle (53) and record the reading B after the pointer of the measuring instrument (4) returns to the center. S6. Measurement data processing and result judgment: If the reading B of each measurement point is within the allowable range of the accuracy of the measurement table (4), then the radial clearance value of each measurement point is the corresponding reading A. Calculate the arithmetic mean of the radial clearance values ​​of all measurement points as the final measurement result. Compare the final measurement result with the radial clearance standard allowable range corresponding to the bearing model to be tested, and determine whether the bearing radial clearance is qualified.

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