Bearing radial clearance measuring frame

Abstract

The invention relates to a bearing radial clearance measuring frame which comprises a frame body, the frame body comprises a bottom frame and a vertical frame arranged on the bottom frame, a meter frame is arranged on the vertical frame, a supporting shaft is further arranged on the vertical frame, one end of the supporting shaft is fixedly connected with the vertical frame, and a limiting device is installed on the supporting shaft. The limiting device comprises an inner ring fixing structure used for fixing a bearing inner ring, a rolling piece limiting structure used for limiting a roller or a retainer on the two axial sides of the bearing to be detected and an outer ring limiting structure used for limiting an outer ring, and the sum of axial gaps between the rolling piece limiting structure and the roller or the retainer is equal to the sum of axial gaps between the rolling piece limiting structure and the roller or the retainer. And the sum of the axial clearances between the outer ring limiting structure and the outer ring is smaller than the axial clearance of the bearing to be measured, so that the accuracy of measuring the radial clearance of the bearing is not affected while the retainer and the outer ring of the bearing to be measured are limited.

Description

Technical Field

[0001] The invention relates to the technical field of bearing detection equipment, and in particular to a bearing radial clearance measuring frame. Background Art

[0002] Deep groove ball bearings have the advantages of low friction coefficient, high limit rotation speed, simple structure, easy installation, large load capacity, and can withstand radial load or combined load of radial and axial simultaneously. They are suitable for high-speed rotation and low noise and low vibration occasions, and are widely used in instrumentation, motors, household appliances, aerospace and other fields. Radial clearance is an important product feature of deep groove ball bearings. In rolling bearings, it can ensure the lubrication effect between the rolling elements and the inner and outer rings of the bearings, reduce friction and wear, and directly affect the technical performance of the bearings such as load distribution, vibration, noise, friction, temperature rise, service life and mechanical operation accuracy. It is of great significance to ensure the normal operation of the bearings and extend their service life.

[0003] The radial clearance of deep groove ball bearings refers to the arithmetic mean of the radial distance of the outer ring relative to the inner ring from one radial eccentric limit position to the opposite limit position when there is no external load on the bearing.

[0004] In the prior art, a Chinese utility model patent with authorization announcement number CN205981043U and authorization announcement date 2017.02.22 discloses a bearing radial clearance measuring device, which includes a base and a frame fixed on the base, the base is provided with a vertical push rod whose lifting and lowering is controlled by an operating handle, the frame is provided with a cross arm pressure rod and a cross arm push rod for axial positioning of the fixed bearing to be measured, an eccentric wheel handle for controlling the axial displacement of the cross arm push rod, and a torsion spring comparator, the device also includes a range adjustment bolt, which is installed in cooperation with a threaded hole opened at the top of the vertical push rod.

[0005] When using the utility model to measure the radial clearance of the bearing, firstly screw its range adjustment bolt together with the locking nut completely into the top of the vertical push rod, then put the bearing to be measured on the cross arm push rod, and move the cross arm push rod toward the cross arm pressure rod by adjusting the eccentric wheel handle to achieve the effect of pressing the inner ring of the bearing, and adjust the extension of the range adjustment bolt again until the top of the range adjustment bolt touches the bottom of the outer ring of the bearing to be measured, and lock the position of the range adjustment bolt by the locking nut, and then adjust the position of the torsion spring comparator so that its contact touches the top of the outer ring of the bearing to be measured and keeps concentric with the range adjustment bolt, and finally swing the operating handle. At this time, the difference in the readings on the torsion spring comparator is the radial clearance of the bearing to be measured, and the measurement of the radial clearance of the bearing can be completed.

[0006] However, since deep groove ball bearings have a certain degree of self-alignment, during the radial clearance detection process, the rollers and outer rings of the bearings will be deflected due to the influence of the self-alignment and the axial clearance of the bearings, thereby affecting the accuracy of detecting the radial clearance of the bearings. Summary of the invention

[0007] The purpose of the present invention is to provide a bearing radial clearance measuring frame, which is used to solve the problem that the bearing radial clearance measuring device in the prior art cannot position the roller and outer ring of the bearing to be measured during measurement, thereby affecting the accuracy of detecting the bearing radial clearance.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0009] A bearing radial clearance measuring frame comprises a frame body, the frame body comprises a base frame and a vertical frame arranged on the base frame, a meter frame is arranged on the vertical frame, a support shaft is also arranged on the vertical frame, one end of the support shaft is fixedly connected to the vertical frame, a limiting device is installed on the support shaft, the limiting device comprises an inner ring fixing structure for fixing the inner ring of the bearing, a rolling member limiting structure for limiting the rolling member on both axial sides of the bearing to be measured, and an outer ring limiting structure for limiting the outer ring, the sum of the axial clearances between the rolling member limiting structure and the rolling member, and the sum of the axial clearances between the outer ring limiting structure and the outer ring are both smaller than the axial clearance of the bearing to be measured.

[0010] Furthermore, the limiting device includes a limiting seat and a limiting pressure plate for clamping the inner ring of the bearing, the limiting seat includes a sleeve pipe section and a baffle, the sleeve pipe section is sleeved on the support shaft, the limiting pressure plate is sleeved on the sleeve pipe section, the inner side surfaces of the baffle and the limiting pressure plate relative to each other and the part of the inner side surface close to the support shaft constitute the inner ring fixing structure, and the inner side surfaces of the baffle and the limiting pressure plate relative to each other are provided with the rolling element limiting structure and the outer ring limiting structure.

[0011] Furthermore, a shoulder for positioning the limit device is provided on the support shaft, and a threaded section is provided on the end of the support shaft away from the stand. The limit pressure plate is tightened by screwing a clamping nut on the threaded section, and the limit device is pressed against the bearing to be tested through the joint action of the shoulder and the clamping nut.

[0012] Furthermore, the rolling element limiting structure is a convex ring or circumferentially grouped convex blocks arranged on the end surfaces of the baffle plate and the limiting pressure plate facing the bearing to be tested.

[0013] Furthermore, the outer ring limiting structure is the end surface of the baffle plate and the limiting pressure plate facing the bearing to be tested.

[0014] Furthermore, the axial clearances between the rolling element limiting structure and the rolling element, and between the outer ring limiting structure and the outer ring of the bearing are all less than half of the axial clearance of the bearing to be tested.

[0015] Furthermore, there is a radial gap between the rolling element limiting structure and the outer ring of the bearing to be tested in the radial direction.

[0016] Furthermore, the base frame is configured as a bottom plate, and the vertical frame is configured as a vertical plate.

[0017] Furthermore, the watch frame is arranged directly above the supporting shaft.

[0018] The above technical scheme has the following beneficial effects: the present invention proposes an improved bearing radial clearance measuring frame, the frame body includes a base frame and a vertical frame arranged on the base frame, a meter frame is arranged on the vertical frame, a support shaft is also arranged on the vertical frame, the support shaft and the meter frame are in different positions, one end of the support shaft is fixedly connected to the vertical frame, a limiting device is installed on the support shaft, the limiting device includes an inner ring fixing structure for fixing the inner ring of the bearing, a rolling member limiting structure for limiting the rolling member on both axial sides of the bearing to be measured, and an outer ring limiting structure for limiting the outer ring, the sum of the axial clearances between the rolling member limiting structure and the rolling member, and the sum of the axial clearances between the outer ring limiting structure and the outer ring are both less than the axial clearance of the bearing to be measured. In this way, the outer ring of the bearing to be measured is axially limited by the limiting device, and the rolling member (cage or roller) of the bearing to be measured is axially limited at the same time, and there is an axial clearance between the limiting device and the outer ring and the cage of the bearing to be measured in the axial direction, which greatly improves the accuracy of measuring the radial clearance of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of an embodiment of a bearing radial clearance measuring frame of the present invention during measurement; Figure 2 for Figure 1 A magnified schematic diagram of point A; Figure 3 This is a schematic diagram of the shaft being subjected to a vertical downward force during measurement; Figure 4 Schematic diagram of the shaft being subjected to vertical upward force during measurement.

[0020] In the figure: 1. support shaft; 2. clamping nut; 3. bearing inner ring; 4. bearing retainer; 5. limit pressure plate; 6. gauge stand; 7. micrometer; 8. bearing outer ring; 9. limit seat; 91. baffle; 92. sleeve pipe section; 10. vertical plate; 11. bottom plate; 12. outer ring limit structure; 13. rolling element limit structure; 14. inner ring fixing structure; H. axial clearance between one side of the limit device and the bearing outer ring and the bearing retainer. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] The present invention proposes a bearing radial clearance measuring frame, comprising a frame body, the frame body comprising a base frame and a vertical frame arranged on the base frame, a meter frame being arranged on the vertical frame, a support shaft being also arranged on the vertical frame, the support shaft and the meter frame being in different positions, a limiting device being arranged on the support shaft, the limiting device comprising an inner ring fixing structure for fixing the inner ring of the bearing to be measured, and a rolling member limiting structure and an outer ring limiting structure for limiting the rolling member and the outer ring in the axial direction, the rolling member being the part where the inner ring and the outer ring of the bearing roll, thereby ensuring that the retaining frame or roller and the outer ring of the bearing to be measured are limited without affecting the accuracy of the measurement.

[0023] Based on the above concept, the present invention provides a variety of different bearing radial clearance measuring frame embodiments for illustration.

[0024] In a basic embodiment, Figure 1 As shown, the bearing radial clearance measuring frame includes a frame body, the frame body includes a base frame and a vertical frame arranged on the base frame, a meter frame 6 is arranged on the vertical frame, a support shaft 1 is also arranged on the vertical frame, the support shaft 1 and the meter frame 6 are in different positions, and a limiting device is also sleeved on the support shaft 1, the limiting device includes an inner ring fixing structure 14 for fixing the bearing inner ring 3, and also includes a rolling element limiting structure 13 for limiting the bearing retainer 4 on both axial sides of the bearing to be measured, and an outer ring limiting structure 12 for limiting the bearing outer ring 8, the sum of the axial clearance between the rolling element limiting structure 13 and the bearing retainer 4, and the sum of the axial clearance between the outer ring limiting structure 12 and the bearing outer ring 8 are both smaller than the axial clearance of the bearing to be measured, the bearing retainer 4 is limited in the axial direction, and the roller is also limited in the axial direction through the action of the bearing retainer 4. In this way, the outer ring 8 and the bearing retainer 4 can be limited, and the accuracy of the radial clearance measurement can also be ensured.

[0025] On the basis of the above embodiment, the limiting device can be set as two limiting plates, which are mounted on the support shaft 1, with the bearing to be tested sandwiched between them, and the limiting plates are provided with an inner ring fixing structure 14, a rolling element limiting structure 13 and an outer ring limiting structure 12, so as to limit the bearing to be tested. In a preferred embodiment, as Figure 1 As shown, the limiting device includes a limiting seat 9 and a limiting pressure plate 5 for clamping the inner ring 3 of the bearing, the limiting seat 9 includes a sleeve pipe section 92 and a baffle 91, the sleeve pipe section 92 is sleeved on the support shaft 1, the limiting pressure plate 5 is sleeved on the sleeve pipe section 92, the inner side surfaces of the baffle 91 and the limiting pressure plate 5 relative to each other, the inner side surfaces of the baffle 91 and the limiting pressure plate 5 close to the support shaft 1 constitute an inner ring fixing structure 14, and the inner side surfaces of the baffle 91 and the limiting pressure plate 5 relative to each other are both provided with a rolling element limiting structure 13 and an outer ring limiting structure 12.

[0026] On the basis of the above embodiment, the limit device can be directly sleeved on the support shaft 1, and a retaining ring is installed on the support shaft 1 to axially fix the limit device. In another embodiment, a shoulder for positioning the limit device is provided on the support shaft 1, and a through hole is opened at the end of the support shaft 1. After the limit pressing plate 5 is pressed, a fixing pin is inserted into the through hole to press the limit pressing plate 5. In a preferred embodiment, as Figure 1 As shown, a shoulder for positioning the limit device is provided on the support shaft 1, and a threaded section is provided at the end of the support shaft 1 away from the stand. The limit pressure plate 5 is tightened by screwing the clamping nut 2 on the threaded section. The limit device is pressed against the bearing to be tested through the joint action of the shoulder and the clamping nut 2, so that the limit pressure plate 5 can be conveniently tightened and loosened.

[0027] On the basis of the above embodiment, the rolling element limiting structure 13 can be configured as a plurality of protrusions extending from the baffle 91 of the limiting seat 9 and the limiting pressure plate 5 toward one end face of the bearing to be tested, the plurality of protrusions are evenly distributed in the circumferential direction, and there is an axial gap between the protrusions and the bearing retainer 4 of the bearing to be tested. In a preferred embodiment, as Figure 1-2 As shown, the rolling element limiting structure 13 is configured as a convex ring provided on the end surface of the baffle 91 of the limiting seat 9 and the limiting pressure plate 5 facing the bearing to be tested, and there is an axial gap between the convex ring and the bearing retainer 4 of the bearing to be tested, so that the bearing to be tested can be better axially limited.

[0028] In the above embodiment, the outer ring limiting structure 12 is the baffle 91 of the limiting seat 9 and the end surface of the limiting pressure plate 5 facing the bearing to be tested, so as to achieve the axial limiting effect on the outer ring 8 of the bearing to be tested.

[0029] In the above embodiment, there is an axial gap between the rolling element limiting structure 13 and the bearing retainer 4 of the bearing to be tested, and there is an axial gap between the outer ring limiting structure 12 provided on the baffle 91 of the limiting seat 9 and the limiting pressure plate 5 and the outer ring 8 of the bearing, and the sum of the axial gaps between the rolling element limiting structure 13 and the bearing retainer 4, and the sum of the axial gaps between the outer ring limiting structure 12 and the outer ring 8 of the bearing are both smaller than the axial clearance of the bearing to be tested, thus ensuring that the limiting structure can be between the bearing retainer 4 and the shaft of the bearing to be tested. The outer ring 8 of the bearing is limited in the axial direction, and a gap is left between the bearing retainer 4 and the outer ring 8 of the bearing and the rolling element limiting structure 13 and the outer ring limiting structure 12 in the axial direction to prevent the rolling element limiting structure 13 and the outer ring limiting structure 12 from touching the bearing retainer 4 and the outer ring 8 of the bearing and affecting the measurement result. There is also a radial gap between the rolling element limiting structure 13 and the outer ring 8 of the bearing in the radial direction, which ensures that the outer ring 8 of the bearing can move in a small range in the radial direction during measurement to prevent the radial clearance of the final measurement from being too small.

[0030] Preferably, Figure 2 As shown, the axial clearances between the rolling element limiting structure 13 and the bearing retainer 4, and between the outer ring limiting structure 12 and the bearing outer ring 8 are all less than half of the axial clearance of the bearing to be measured, that is, the axial clearance H between one side of the limiting device and the bearing outer ring and the bearing retainer is less than half of the axial clearance of the bearing to be measured. In this way, the sum of the axial clearances between the limiting device and the bearing retainer 4 and the bearing outer ring 8 is less than the axial clearance of the bearing to be measured, making the measurement result more accurate.

[0031] On the basis of the above embodiment, the base frame can be set as a bracket type, and the vertical frame can be set as a column. In a preferred embodiment, the base frame is set as a bottom plate 11, and the vertical frame is set as a vertical plate 10, so that the whole frame is more stable.

[0032] On the basis of the above embodiment, the meter frame 6 can be arranged below or beside the support shaft 1, and it is only necessary to ensure that after the measuring meter is installed, the contact of the measuring meter faces the support shaft 1. In a preferred embodiment, Figure 1 As shown, the meter stand 6 is arranged directly above the support shaft 1, so that it is convenient to read the reading during measurement.

[0033] In the above embodiment, the rolling components of the bearing to be measured are the bearing retainer 4 and the rollers, and the rolling components of the bearing are limited in the axial direction by limiting the bearing retainer 4 in the axial direction. In other embodiments, the bearing whose rolling components are only rollers can also be measured, and the rolling component limiting structure 13 limits the bearing rollers in the axial direction. At the same time, there is an axial gap between the rolling component limiting structure 13 and the bearing rollers in the axial direction, so that the sum of the axial gaps is less than the axial clearance of the bearing to be measured, so that the radial clearance of the bearing can be measured.

[0034] When the bearing radial clearance measuring frame of the present invention is used in a bearing radial clearance measuring device, as Figure 1 As shown, a measuring gauge is mounted on the gauge frame 6. During measurement, the contact of the measuring gauge is at the middle position of the axial direction of the bearing to be measured, and the contact touches the outer ring of the bearing to be measured, and then the measuring gauge is fixed on the gauge frame 6. Preferably, a micrometer 7 is used as the measuring gauge, which can make the measurement result more accurate.

[0035] First install the limit seat 9 on the support shaft 1, then install the bearing to be tested on the limit seat 9, and finally install the limit pressure plate 5 on the limit seat 9. Tighten the limit pressure plate 5 by screwing the clamping nut 2. The clamping nut 2 works together with the shaft shoulder to make the limit pressure plate 5 clamp the bearing to be tested. Then adjust the contact of the micrometer 7 to align with the middle position of the axial direction of the bearing to be tested, and the contact lightly touches the outer ring of the bearing to be tested. After fixing the micrometer 7, adjust the micrometer 7 to zero, and then start measuring.

[0036] First, apply a vertical downward force to the bearing to be tested, such as Figure 3 As shown, at this time, the pointer of the micrometer 7 rotates clockwise. After the pointer stabilizes, record the change in the pointer deflection value △1, stop applying force to restore the pointer of the micrometer 7 to its original position, and then apply a vertical upward force to the bearing to be tested, as shown in the figure. Figure 4 As shown, at this time, the pointer of the micrometer 7 rotates counterclockwise. After the pointer stabilizes, the change value of the pointer deflection △2 is recorded, and finally the radial clearance Gr1=|△1-△2| of the bearing to be tested at this position is calculated; then the bearing to be tested is rotated 120 degrees and 240 degrees to measure the radial clearances Gr2 and Gr3 of the bearing to be tested at the positions where the bearing is rotated 120 degrees and 240 degrees respectively. Finally, the radial clearance Gr= (Gr1+ Gr2+ Gr3) / 3 of the bearing to be tested can be calculated.

[0037] During the measurement, 5 or 8 positions may be selected for measurement, and the positions selected do not need to be uniform in the circumferential direction. Finally, it is only necessary to take the arithmetic average of the radial clearance values ​​measured at the selected positions.

[0038] When measuring the radial clearance of bearings of different sizes, first install the limit seat 9 on the support shaft 1, then install the bearing to be measured, and finally tighten the limit pressure plate 5 to press the bearing to be measured by screwing the clamping nut 2. Adjust the contact of the micrometer 7 to align it with the middle position of the axial direction of the bearing to be measured to measure the radial clearance value of the bearing.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A bearing radial clearance measuring frame, comprising a frame body, the frame body comprising a base frame and a vertical frame arranged on the base frame, a table frame being arranged on the vertical frame, characterized in that: A support shaft is also provided on the stand, one end of which is fixedly connected to the stand, and a limiting device is installed on the support shaft. The limiting device includes an inner ring fixing structure for fixing the inner ring of the bearing, a rolling element limiting structure for limiting the rolling element on both axial sides of the bearing to be tested, and an outer ring limiting structure for limiting the outer ring. The sum of the axial clearances between the rolling element limiting structure and the rolling element, and the sum of the axial clearances between the outer ring limiting structure and the outer ring are both smaller than the axial clearance of the bearing to be tested.

2. The bearing radial clearance measuring frame according to claim 1, characterized in that: The limiting device includes a limiting seat and a limiting pressure plate for clamping the inner ring of the bearing, the limiting seat includes a sleeve pipe section and a baffle, the sleeve pipe section is sleeved on the support shaft, the limiting pressure plate is sleeved on the sleeve pipe section, the inner side surfaces of the baffle and the limiting pressure plate relative to each other and the part of the inner side surface close to the support shaft constitute the inner ring fixing structure, and the inner side surfaces of the baffle and the limiting pressure plate relative to each other are provided with the rolling element limiting structure and the outer ring limiting structure.

3. The bearing radial clearance measuring frame according to claim 2, characterized in that: The support shaft is provided with a shoulder for positioning the limit device, and a threaded section is provided at one end of the support shaft away from the stand. The limit pressure plate is tightened by screwing a clamping nut on the threaded section, and the limit device is pressed against the bearing to be tested through the joint action of the shoulder and the clamping nut.

4. The bearing radial clearance measuring frame according to claim 2, characterized in that: The rolling element limiting structure is a convex ring or circumferentially grouped convex blocks arranged on the end surfaces of the baffle plate and the limiting pressure plate facing the bearing to be tested.

5. The bearing radial clearance measuring stand according to claim 4, characterized in that: The outer ring limiting structure is the end surface of the baffle plate and the limiting pressure plate facing the bearing to be tested.

6. The bearing radial clearance measuring stand according to any one of claims 1 to 5, characterized in that: The axial clearance between the rolling element limiting structure and the rolling element, and between the outer ring limiting structure and the outer ring of the bearing are all less than half of the axial clearance of the bearing to be tested.

7. The bearing radial clearance measuring frame according to claim 6, characterized in that: There is a radial gap between the rolling element limiting structure and the outer ring of the bearing to be tested in the radial direction.

8. The bearing radial clearance measuring stand according to any one of claims 1 to 5, characterized in that: The bottom frame is configured as a bottom plate, and the vertical frame is configured as a vertical plate.

9. The bearing radial clearance measuring frame according to claim 8, characterized in that: The table frame is arranged directly above the supporting shaft.

Images