Micrometer for bearing clearance detection
By designing a micrometer for bearing clearance detection and using a spiral micrometer to read the bearing axial movement amount, the problem of low accuracy of bearing axial clearance detection in the prior art was solved, and a high-precision detection of 0.01mm was achieved.
Patent Information
- Application Number
- CN202422116539.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-29
AI Technical Summary
In the prior art, the accuracy of bearing axial clearance detection is low, mainly relying on the operator's subjective judgment, resulting in inaccurate detection results.
A micrometer for bearing clearance detection including positioning screws, cages, compression frames, spiral micrometers and zero-position calibration blocks is used to read the axial movement of the bearing through the spiral micrometer to avoid human judgment and improve detection accuracy.
The accuracy of bearing axial clearance detection is improved to 0.01mm, reducing human error and improving the accuracy and consistency of detection.
Smart Images
Figure CN223243525U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of measuring instruments and relates to a micrometer for detecting bearing clearance. Background Art
[0002] Bearing clearance, also known as bearing play, refers to the amount of axial movement of a bearing when one of its inner or outer rings is fixed and the free bearing is allowed to move axially when not mounted on a shaft or bearing housing. Proper mounting clearance contributes to the proper functioning of rolling bearings. Too little clearance can cause the bearing to heat up, malfunction, and even cause the rolling elements to seize. Excessive clearance can lead to excessive equipment vibration and excessive bearing noise.
[0003] Currently, the common method for measuring bearing axial clearance is to first use a feeler gauge to identify the maximum load point of the rolling bearing. Then, insert the feeler gauge between the rolling element and the outer (inner) ring at a 180-degree angle. The thickness of the feeler gauge, with appropriate tightness, is λ. Axial clearance is then calculated using the formula c = λ / (2s in β), where c is the axial clearance (in mm); λ is the feeler gauge thickness (in mm); and β is the bearing taper angle (in degrees). Existing feeler gauge measurements rely solely on the operator's feel, resulting in low accuracy. Summary of the Invention
[0004] The purpose of this utility model is to solve the above problems in the existing technology and propose a micrometer for bearing clearance detection. The technical problem to be solved by this utility model is how to improve the accuracy of bearing axial clearance detection.
[0005] The purpose of this utility model can be achieved through the following technical solutions:
[0006] A micrometer for detecting bearing clearance is characterized in that it includes a positioning screw and a retaining frame connected to one end of the positioning screw, the positioning screw is provided with a clamping frame that can move axially relative to the positioning screw and position the positioning screw, the clamping frame is provided with a screw micrometer and a zero position calibration block parallel to the axis of the positioning screw at one end away from the retaining frame, the positioning screw has a detection plane perpendicular to its axis, and the screw micrometer and the zero position calibration block are both arranged opposite to the detection plane.
[0007] Different from the feeler gauge measurement in the existing technology, when using the micrometer for bearing clearance detection, the bearing to be tested is fixed by a retaining frame, and then the zero point of the micrometer is calibrated by the zero calibration block and the detection plane. The outer ring of the bearing to be tested is pushed axially relative to the inner ring of the bearing through the clamping frame and positioned. Finally, the micrometer is used to read the amount of axial movement, thus eliminating the need for human subjective judgment. In addition, the measurement accuracy of the micrometer can usually reach 0.01mm, thereby improving the accuracy of bearing axial clearance detection.
[0008] In the above-mentioned micrometer for detecting bearing clearance, the retaining frame includes a positioning shaft threadedly connected to a positioning screw, a pressure plate and a positioning disc fixedly mounted on the positioning shaft, the pressure plate and the positioning disc being arranged opposite each other and the spacing between the two being adjustable. When in use, the user only places the bearing to be tested on the positioning disc, then passes the positioning shaft through the center of the bearing to be tested and the positioning disc at the same time, and rotates the positioning shaft to connect the positioning shaft to the positioning screw. The user then further rotates the positioning shaft so that the positioning disc and the pressure plate are respectively pressed against both sides of the inner ring of the bearing to be tested to position the inner ring of the bearing, and the positioning disc rests on the positioning screw. At this time, the positioning of the bearing to be tested is completed. It should be noted that for bearings of different specifications, only the retaining frame needs to be replaced. The lengths of the positioning discs and pressure plates of different retaining frames are different. The lengths of the positioning discs and pressure plates are greater than the inner diameter of the bearing to be tested and less than or equal to the diameter of the inner ring of the bearing to be tested, making the present micrometer for detecting bearing clearance more versatile.
[0009] In the aforementioned bearing clearance micrometer, the hold-down frame comprises a rotating drum mounted on a positioning screw. The end of the rotating drum, closest to the retaining frame, has a mounting arm perpendicular to the axis of the positioning screw. The mounting arm is equipped with a plurality of contour blocks parallel to the axis of the positioning screw. These contour blocks are positioned on the outer periphery of the positioning plate. During testing, the user rotates the rotating drum, causing the contour blocks to axially press against the outer ring of the bearing to be tested as the drum rotates, until the drum cannot rotate further. At this point, the distance between the micrometer screw and the detection plane on the positioning screw represents the axial clearance of the bearing to be tested.
[0010] In the aforementioned bearing clearance micrometer, the contour block can be moved and locked relative to the mounting arm in a direction perpendicular to the axis of the positioning screw. The end surface of the contour block facing away from the mounting arm is a plane perpendicular to the axis of the positioning screw. Adjusting the position of the contour block allows the bearing clearance micrometer to adapt to different specifications of bearings to be tested, improving versatility. By positioning the extrusion end of the contour block in a plane perpendicular to the axis of the positioning screw, the contour block can better compress the end surface of the outer ring of the bearing to be tested, thereby improving detection accuracy.
[0011] In the aforementioned bearing clearance micrometer, the mounting arm has a strip-shaped hole along its length. The contour block is inserted into the strip-shaped hole and threaded with a fastening nut. The contour block and the fastening nut respectively abut against the edges of the strip-shaped hole. Inserting the contour block into the strip-shaped hole facilitates adjustment of the position of the contour block along the length of the mounting arm. Furthermore, providing the fastening nut on the contour block facilitates locking of the contour block after adjustment.
[0012] In the aforementioned micrometer for measuring bearing clearance, the rotating drum is threadedly connected to the outer wall of the positioning screw, and multiple mounting arms are provided and distributed along the circumference of the rotating drum. By threading the rotating drum to the outer wall of the positioning screw, the movement of the rotating drum relative to the positioning screw is facilitated, while also ensuring the reliability of the connection between the positioning screw and the rotating drum. Furthermore, the axial movement limit of the rotating drum after movement is better formed. Furthermore, by providing multiple mounting arms along the circumference of the rotating drum, multiple equal-height blocks can squeeze the outer ring of the bearing to be tested at multiple points along the circumference, thereby preventing the outer ring from being deflected when squeezed by a single equal-height block, thereby improving measurement accuracy.
[0013] In the aforementioned bearing clearance measuring micrometer, the positioning disc has an inserting portion on the side facing the pressure plate, with a step formed between the inserting portion and the positioning disc. The inserting portion can be inserted into the center of the bearing to be tested, while the step can abut against the inner ring of the bearing, thereby limiting the radial movement of the bearing to be tested. Simultaneously, the pressure plate and positioning disc can clamp the inner ring of the bearing to be tested, thereby limiting the axial movement of the bearing to be tested, thereby better positioning the bearing to be tested.
[0014] In the above-mentioned micrometer for detecting bearing clearance, a handle is provided at the end of the positioning shaft close to the pressure plate. The provision of the handle facilitates the user to rotate the positioning shaft, thereby better positioning the bearing to be tested.
[0015] In the aforementioned bearing clearance detection micrometer, the end of the positioning screw away from the retainer has a grip portion, and the detection plane is the inner end surface of the grip portion. Simply setting the positioning screw into a T-shape facilitates the processing and manufacturing of the detection plane and the positioning screw.
[0016] In the aforementioned bearing clearance micrometer, the zero calibration block is cylindrical and comprises multiple zero calibration blocks, with the end surface of the zero calibration block facing the grip portion being parallel to the detection plane. This structure allows the detection plane to better abut against the zero calibration block, ensuring that the micrometer reads zero before measurement, thereby improving the accuracy of subsequent measurements.
[0017] Compared with the existing technology, the advantages of the micrometer for bearing clearance detection are: different from the feeler gauge measurement in the existing technology, when using the micrometer for bearing clearance detection, the bearing to be tested is fixed by a retaining frame, and then the outer ring of the bearing to be tested is pushed axially relative to the inner ring of the bearing through the clamping frame, and finally the amount of axial movement is read by a screw micrometer, without human subjective judgment, thereby improving the accuracy of bearing axial clearance detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a structural diagram of the micrometer used for bearing clearance detection.
[0019] In the figure, 1. Positioning screw; 1a. Gripping part; 1a1. Detection plane; 2. Retaining frame; 2a. Positioning shaft; 2b. Pressure plate; 2c. Positioning disk; 2c1. Connecting part; 2c2. Step part; 2d. Handle; 3. Pressing frame; 3a. Rotating cylinder; 3b. Mounting arm; 3b1. Strip hole; 4. Micrometer screw; 5. Zero calibration block; 6. Equal height block; 7. Fastening nut. DETAILED DESCRIPTION
[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0021] A micrometer for bearing clearance detection, refer to Figure 1 The invention comprises a positioning screw 1 and a retainer 2 connected to one end of the positioning screw 1. Specifically, the retainer 2 comprises a positioning shaft 2a threadedly connected to the positioning screw 1. A pressure plate 2b is fixedly mounted on the positioning shaft 2a, and a positioning disc 2c is sleeved thereon. The pressure plate 2b and positioning disc 2c are positioned opposite each other, and the spacing between them is adjustable. The positioning disc 2c has an inserting portion 2c1 on the side facing the pressure plate 2b. A step 2c2 is formed between the inserting portion 2c1 and the positioning disc 2c, for the inner ring of the bearing to abut against. A handle 2d is provided at the end of the positioning shaft 2a near the pressure plate 2b. The positioning screw 1 is provided with a pressure frame 3 that can move axially relative to the positioning screw 1 and position the positioning screw 1. The end of the pressure frame 3 facing away from the retainer 2 is provided with a micrometer screw 4 and a zero calibration block 5, both parallel to the axis of the positioning screw 1. The positioning screw 1 has a detection plane 1a1 perpendicular to its axis, and the micrometer screw 4 and the zero calibration block 5 are both positioned opposite the detection plane 1a1.
[0022] Specifically, refer to Figure 1 The clamping frame 3 includes a rotating cylinder 3a that is sleeved on the positioning screw 1. The end of the rotating cylinder 3a close to the retaining frame 2 has a mounting arm 3b that is perpendicular to the axis of the positioning screw 1. The mounting arm 3b is provided with a plurality of contour blocks 6 that are parallel to the axis of the positioning screw 1. The contour blocks 6 are arranged on the outer peripheral side of the positioning disk 2c. More specifically, the contour blocks 6 can be moved and locked relative to the mounting arm 3b in a direction perpendicular to the axis of the positioning screw 1. The end surface of the contour block 6 away from the mounting arm 3b is a plane perpendicular to the axis of the positioning screw 1. The mounting arm 3b has a strip hole 3b1 along its length. The contour block 6 is inserted into the strip hole 3b1 and is threadedly connected to a fastening nut 7. The contour block 6 and the fastening nut 7 are respectively against the two side edges of the strip hole 3b1.
[0023] In this embodiment, the rotating cylinder 3a is preferably threadedly connected to the outer wall of the positioning screw 1, and the mounting arms 3b are multiple and distributed circumferentially along the rotating cylinder 3a; the positioning screw 1 preferably has a gripping portion 1a at the end away from the retaining frame 2, and the detection plane 1a1 is the inner end face of the gripping portion 1a; the zero position calibration block 5 is preferably columnar and has multiple pieces, and the end face of the zero position calibration block 5 facing the gripping portion 1a is a plane parallel to the detection plane 1a1.
[0024] The following describes the working principle of the micrometer used for bearing clearance detection:
[0025] The user first places the bearing to be tested on the positioning plate 2c, then passes the positioning shaft 2a through the center of the bearing to be tested and the positioning plate 2c at the same time, and rotates the positioning shaft 2a through the handle 2d to thread the positioning shaft 2a onto the positioning screw 1. Then the user further rotates the positioning shaft 2a so that the positioning plate 2c and the pressure plate 2b are respectively pressed against the two sides of the inner ring of the bearing to be tested to position the inner ring of the bearing, and the positioning plate 2c rests on the positioning screw 1. At this time, the positioning of the bearing to be tested is completed. It should be noted that for bearings of different specifications, it is only necessary to replace the retaining frame 2. The lengths of the positioning plates 2c and the pressure plates 2b of different retaining frames 2 are different. The lengths of the positioning plates 2c and the pressure plates 2b are greater than the inner diameter of the bearing to be tested, and are less than or equal to the diameter of the inner ring of the bearing to be tested.
[0026] Then the user performs the zeroing operation of the micrometer 4. The user first adjusts the position of the contour block 6 so that the contour block 6 on the mounting arm 3b is arranged relative to the outer ring of the bearing to be measured. Then the user rotates the rotating drum 3a so that the contour block 6 rotates with the rotating drum 3a and approaches the bearing to be measured until several contour blocks 6 contact the end face of the outer ring of the bearing to be measured at the same time. Then the user rotates the positioning screw 1 until the detection plane 1a1 on the positioning screw 1 abuts against the zero calibration block 5. At this time, the zeroing operation of the micrometer 4 is completed.
[0027] Then the user further rotates the rotating drum 3a, so that the contour block 6 rotates with the rotating drum 3a and squeezes the outer ring of the bearing to be tested axially until the rotating drum 3a can no longer rotate. At this time, the distance between the micrometer 4 and the detection plane 1a1 on the positioning screw 1 is the axial clearance of the bearing to be tested. Then the user rotates the micrometer 4 so that the micrometer 4 abuts against the detection plane 1a1 on the positioning screw 1. At this time, the user can read the reading on the micrometer 4.
[0028] It should be noted that the reading of the micrometer screw = the reading of the fixed sleeve main scale + the reading on the differential cylinder. The fixed sleeve main scale has a 1mm grid and the differential cylinder has a 0.01mm grid. When reading, pay attention to the verticality of the line of sight with the scale. If the 0.5mm scale line of the sleeve main scale and the front edge of the differential cylinder are in a state of seemingly compressive but not compressive during the reading, it should be determined based on the reading on the differential cylinder whether it should be included in the reading. If the reading on the differential cylinder is greater than or equal to 0, it is included in the reading, otherwise it is not included in the reading.
[0029] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.
Claims
1. A micrometer for detecting bearing clearance, characterized in that: The invention comprises a positioning screw (1) and a retaining frame (2) connected to one end of the positioning screw (1); a pressing frame (3) capable of axially moving and positioning relative to the positioning screw (1) is provided on the positioning screw (1); a micrometer screw (4) and a zero position calibration block (5) parallel to the axis of the positioning screw (1) are provided at one end of the pressing frame (3) away from the retaining frame (2); a detection plane (1a1) perpendicular to the axis of the positioning screw (1) is provided on the positioning screw (1), and the micrometer screw (4) and the zero position calibration block (5) are respectively arranged relative to the detection plane (1a1).
2. A micrometer for detecting bearing clearance according to claim 1, characterized in that: The retaining frame (2) comprises a positioning shaft (2a) threadedly connected to the positioning screw (1); a pressure plate (2b) is fixedly provided on the positioning shaft (2a) and a positioning disc (2c) is sleeved thereon; the pressure plate (2b) and the positioning disc (2c) are arranged relative to each other and the distance between the two can be adjusted.
3. A micrometer for detecting bearing clearance according to claim 2, characterized in that: The pressing frame (3) includes a rotating cylinder (3a) sleeved on the positioning screw (1), and the rotating cylinder (3a) has a mounting arm (3b) perpendicular to the axis of the positioning screw (1) at one end close to the retaining frame (2). The mounting arm (3b) is provided with a plurality of equal-height blocks (6) parallel to the axis of the positioning screw (1), and the equal-height blocks (6) are arranged on the outer peripheral side of the positioning disk (2c).
4. A micrometer for detecting bearing clearance according to claim 3, characterized in that: The contour block (6) can be moved and locked relative to the mounting arm (3b) in a direction perpendicular to the axis of the positioning screw (1); the end surface of the contour block (6) away from the mounting arm (3b) is a plane perpendicular to the axis of the positioning screw (1).
5. A micrometer for detecting bearing clearance according to claim 4, characterized in that: The mounting arm (3b) is provided with a strip hole (3b1) along its length direction, the equal height block (6) is inserted into the strip hole (3b1) and is threadedly connected with a fastening nut (7), and the equal height block (6) and the fastening nut (7) are respectively against the two side edges of the strip hole (3b1).
6. A micrometer for detecting bearing clearance according to claim 3, 4 or 5, characterized in that: The rotating cylinder (3a) is threadedly connected to the outer side wall of the positioning screw (1), and the mounting arms (3b) are multiple and distributed along the circumference of the rotating cylinder (3a).
7. A micrometer for detecting bearing clearance according to claim 2, 3, 4 or 5, characterized in that: The positioning disc (2c) has a plug-in portion (2c1) on one side facing the pressure plate (2b), and a step portion (2c2) is formed between the plug-in portion (2c1) and the positioning disc (2c).
8. A micrometer for detecting bearing clearance according to claim 2, 3, 4 or 5, characterized in that: A handle (2d) is provided at the end of the positioning shaft (2a) close to the pressing plate (2b).
9. A micrometer for detecting bearing clearance according to claim 1, 2, 3, 4 or 5, characterized in that: The end of the positioning screw (1) away from the retaining frame (2) has a gripping portion (1a), and the detection plane (1a1) is the inner end surface of the gripping portion (1a).
10. A micrometer for detecting bearing clearance according to claim 9, characterized in that: The zero position calibration block (5) is columnar and has multiple pieces, and the end surface of the zero position calibration block (5) facing the gripping portion (1a) is a plane parallel to the detection plane (1a1).