Rotational accuracy detection tooling for bearing axial runout and radial runout

Abstract

This utility model discloses a rotational accuracy testing fixture for bearing axial and radial runout, comprising a load block and a working module for cooperating with the load block. The working module includes an outer ring working block and an inner ring working block. The load block is provided with a connection structure for detachable connection with either the outer or inner ring working block. The outer ring working block has a mounting groove for mounting the outer ring of an external bearing to be tested, and the inner ring working block has a mounting shaft for fitting into the shaft hole of the inner ring of an external bearing to be tested. The working module also includes a support component for stabilizing the bearing to be tested and improving the testing accuracy when testing the outer ring of small and medium-sized bearings. This utility model solves the problems of traditional fixtures, which require different load weights for different bearing models due to design dimensions based on bearing testing loads, resulting in repeated production, high costs, and bulky size that hinders instrument measurement and easily interferes with instruments, causing errors.

Description

Technical Field

[0001] This utility model relates to the field of bearing testing fixture technology, specifically a rotational accuracy testing fixture for bearing axial runout and radial runout. Background Technology

[0002] In the field of bearing processing and quality inspection, the radial and axial runout rotational accuracy of bearings is a key indicator for measuring the quality of finished products and must meet the requirements of standards such as GB / T307.2-2020 "Principles and Methods for Measurement and Inspection of Rolling Bearings". However, traditional bearing rotational accuracy testing fixtures have significant drawbacks in practical applications: First, traditional fixtures are usually designed with overall dimensions directly based on the minimum load required for bearing testing, resulting in different weight load blocks for different bearing models, leading to repetitive production, manufacturing, and high costs in use. Second, when testing types requiring larger loads, such as tapered roller bearings and angular contact bearings, the fixture is bulky and heavy, not only hindering the instrument's measurement operation during testing but also potentially causing interference between the fixture dimensions and the instrument, leading to deviations in the test results. Third, the traditional fixture structure design does not consider eccentricity compensation, and the eccentricity of the fixture itself can easily generate additional torque during testing, affecting measurement accuracy. Furthermore, it cannot effectively adapt to the stable testing requirements of small and medium-sized bearings, requiring additional complex structural support, further increasing the operational difficulty and error risk. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a rotational accuracy testing fixture for bearing axial and radial runout. This solves the problems of traditional fixtures, which require different load weights for different bearing models due to their design dimensions based on bearing testing loads, resulting in repeated production, high costs, bulky size that hinders instrument measurement, and easy interference with instruments, leading to errors.

[0004] To achieve the above objectives, this utility model provides a rotational accuracy testing fixture for bearing axial and radial runout, comprising a load block and a working module for cooperating with the load block. The working module includes an outer ring working block and an inner ring working block. The load block is provided with a connection structure for detachable connection with the outer ring working block or the inner ring working block. The outer ring working block has an installation groove for mounting the outer ring of an external bearing to be tested. The inner ring working block has an installation shaft for fitting into the shaft hole of the inner ring of an external bearing to be tested. The working module also includes a support member for stabilizing the bearing to be tested and improving the testing accuracy when testing the outer ring of a small or medium-sized bearing to be tested.

[0005] The advantages of adopting the above technical solution are as follows: The measuring fixture in the above technology achieves detachable connection between the load block and the outer ring working block or inner ring working block through the modular design of the load block and the working module. The working module can be flexibly replaced according to the testing requirements, avoiding the problem of repeated production of traditional fixtures due to different models, and reducing the cost of use. The mounting groove of the outer ring working block and the mounting shaft of the inner ring working block are respectively adapted to the bearing outer ring and inner ring shaft hole to achieve precise positioning. The support component provides stable support when testing the outer ring of small and medium-sized bearings, avoiding bearing shaking and improving the testing accuracy. Through the split connection design of the above technology and the design of connecting the load block and the outer ring working block or inner ring working block according to the different testing requirements of the bearing inner and outer rings, the overall structure is clear and easy to disassemble, effectively solving the problems of bulky traditional fixtures, interference instruments and large errors.

[0006] The present invention further includes: a positioning post coaxially connected to the bottom wall of the load block; positioning holes are provided on both the outer ring working block and the inner ring working block; when the load block is engaged with the outer ring working block, the positioning post is inserted into the positioning hole on the outer ring working block; when the load block is engaged with the inner ring working block, the positioning post is inserted into the positioning hole on the inner ring working block.

[0007] The advantages of adopting the above technical solution are as follows: the positioning pins coaxially connected to the bottom wall of the load block are fitted with the positioning holes of the outer and inner working blocks, and the coaxial positioning structure ensures the concentricity of the load block and the working module, guaranteeing the accuracy of the inspection fixture during rotation; the fitting of the positioning pins and positioning holes enables rapid positioning, reducing assembly errors; this positioning structure makes the fit between the load block and the working module tighter, avoiding displacement during the inspection process, improving the accuracy of the inspection results, and simplifying the fixture assembly process, thereby improving operational efficiency.

[0008] The present invention further comprises: a first connecting hole on the positioning column; a second connecting hole for communicating with the adjacent positioning hole on both the outer ring working block and the inner ring working block; the connecting structure includes connecting bolts; when the load block is engaged with the outer ring working block, the connecting bolts are threadedly engaged with the first connecting hole and the second connecting hole on the outer ring working block respectively; when the load block is engaged with the inner ring working block, the connecting bolts are threadedly engaged with the first connecting hole and the second connecting hole on the inner ring working block respectively.

[0009] The advantages of adopting the above technical solution are: the first connecting hole on the positioning column and the second connecting hole on the working block are connected by a threaded bolt to form a firm and detachable connection structure, ensuring that the load block and the working module do not loosen during the testing process and guaranteeing the stability of the test; the threaded connection facilitates quick disassembly and assembly, improving the convenience of tooling use; the connection structure is simple in design, has low processing cost, and is reusable; at the same time, the bolt locking can further improve the accuracy of the fit between the positioning column and the positioning hole, reducing the test error caused by loose connection.

[0010] The present invention further comprises: the outer peripheral wall of the positioning post and the inner wall of the positioning post are connected by a smooth curved surface and have a chamfer.

[0011] The advantages of adopting the above technical solution are: the smooth curved chamfer design between the outer and inner walls of the positioning post can reduce the frictional resistance during tooling assembly, making the insertion of the positioning post into the positioning hole smoother and improving assembly efficiency; the chamfer structure avoids scratching the bearing or working module by the edge of the positioning post, protecting the bearing being tested and the tooling components; this design can also reduce the wear when the positioning post and the positioning hole are mated, extend the service life of the tooling, and reduce the detection error caused by friction or scratches, ensuring the stability of detection accuracy.

[0012] The present invention further includes a support member comprising a base, the base being cylindrical in shape and the end of the base being a connection end for insertion into the bearing shaft hole to be tested in the outside.

[0013] The advantages of adopting the above technical solution are as follows: the cylindrical base of the support component in the above technology is inserted into the shaft hole of the small and medium-sized bearing through the end connection end to form a stable isolation support structure. When inspecting the outer ring of the small and medium-sized bearing, the bearing can be stably supported on the base, which is convenient for measurement operation; the insertion design of the cylindrical base can accurately position the bearing, avoid the bearing installation tilt, and ensure the correct contact between the probe and the bearing during inspection; the support component has a simple structure, is suitable for the inspection needs of small and medium-sized bearings, solves the problem of unstable support of traditional tooling when inspecting small and medium-sized bearings, and effectively improves the inspection accuracy and ease of operation. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the inner ring worktable and the load block in the cooperation state of this utility model;

[0015] Figure 2 This is a cross-sectional view of the outer ring worktable, base, and load block in the present invention.

[0016] Figure 3 This is a cross-sectional view of the load block in this utility model;

[0017] Figure 4This is a cross-sectional view of the outer ring worktable in this utility model;

[0018] Figure 5 This is a cross-sectional view of the inner ring worktable in this utility model;

[0019] Figure 6 This is a cross-sectional view of the base in this utility model. Detailed Implementation

[0020] This utility model provides a rotational accuracy testing fixture for bearing axial and radial runout, including a load block 1 and a working module for cooperating with the load block 1. The working module includes an outer ring working block 2 and an inner ring working block 3. The load block 1 is provided with a connection structure for detachable connection with the outer ring working block 2 or the inner ring working block 3. The outer ring working block 2 has an installation groove 21 for mounting the outer ring of an external bearing to be tested. The inner ring working block 3 has an installation shaft 31 for fitting into the shaft hole of the inner ring of an external bearing to be tested. The working module also includes a support member for stabilizing the bearing to be tested and improving the testing accuracy when testing the outer ring of a small or medium-sized bearing to be tested. A positioning post 11 is coaxially connected to the bottom wall of the load block 1. Both the outer ring working block 2 and the inner ring working block 3 have positioning holes 22. When the load block 1 is engaged with the outer ring working block 2, the positioning post 11 is fitted into the positioning hole 22 on the outer ring working block 2. When the load block 1 and the inner ring working block 3 are engaged, the positioning post 11 is inserted into the positioning hole 22 on the inner ring working block 3. The positioning post 11 has a first connecting hole 111. The outer ring working block 2 and the inner ring working block 3 each have a second connecting hole 32 for communicating with their respective adjacent positioning holes 22. The connection structure includes a connecting bolt 12. When the load block 1 and the outer ring working block 2 are engaged, the connecting bolt 12 is threaded into the first connecting hole 111 and the second connecting hole 32 on the outer ring working block 2, respectively. When the load block 1 and the inner ring working block 3 are engaged, the connecting bolt 12 is threaded into the first connecting hole 111 and the second connecting hole 32 on the inner ring working block 3, respectively. The outer peripheral wall of the positioning post 11 and the inner wall of the positioning post 11 are connected by a smooth curved surface and a chamfer 13 is formed. The support includes a base 4. The base 4 is cylindrical and the end of the base 4 is a connecting end 41 for inserting into the shaft hole of the bearing to be tested in the outside.

[0021] Operating flow of the inner working block and load block:

[0022] 1. Before testing, clean the mating surfaces of the inner working block and the load block to ensure they are free of oil and impurities;

[0023] 2. Align the positioning pin on the bottom wall of the load block with the positioning hole of the inner ring working block, and slowly insert it along the axial direction to achieve initial positioning using the coaxial positioning structure;

[0024] 3. Secure the load block and the inner ring working block tightly with the connecting bolts through the first connecting hole on the positioning column and the second connecting hole on the inner ring working block to prevent displacement during rotation;

[0025] 4. Install the assembled inner ring working block and load block onto the base of the testing instrument, and confirm the fitting accuracy between the positioning column and the instrument interface;

[0026] 5. Insert the inner ring shaft hole of the bearing to be tested onto the mounting shaft of the inner ring working block, and adjust the bearing position to make it fit tightly against the mounting shaft;

[0027] 6. Start the external testing instrument and rotate the fixture. Use the instrument probe to touch the inner ring end face and radial position of the bearing to obtain axial and radial runout data.

[0028] The operating process of the outer working block, base, and load block:

[0029] 1. For testing the outer ring of small and medium-sized bearings, first install the cylindrical base on the testing instrument platform, and insert the connecting end of the base into the bearing shaft hole to form a stable support;

[0030] 2. Place the outer ring of the bearing to be tested on the base, ensuring that the outer ring of the bearing is in contact with the support surface of the base;

[0031] 3. Take out the outer ring working block, insert the load block positioning pin into the positioning hole of the outer ring working block, and lock the load block and the outer ring working block together with the connecting bolts;

[0032] 4. Place the assembled outer ring working block and load block over the bearing outer ring, ensuring that the mounting groove of the outer ring working block precisely mates with the outer circumference of the bearing outer ring.

[0033] 5. Check that all parts of the tooling are securely connected, and confirm that there is no interference between the base, the outer working block and the load block;

[0034] 6. Start the testing instrument, rotate the fixture, and have the probe touch the outer ring surface of the bearing to collect radial and axial runout data to complete the accuracy test.

[0035] In the above-mentioned technology, the bearing to be tested is identified as 5 in the accompanying drawings.

[0036] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A rotational accuracy testing fixture for bearing axial and radial runout, characterized in that: The device includes a load block and a working module that mates with the load block. The working module includes an outer ring working block and an inner ring working block. The load block is provided with a connection structure for detachable connection with either the outer ring working block or the inner ring working block. The outer ring working block has an installation groove for mounting the outer ring of an external bearing to be tested. The inner ring working block has an installation shaft for fitting into the shaft hole of the inner ring of an external bearing to be tested. The working module also includes a support component for stabilizing the bearing to be tested and improving the testing accuracy when testing the outer ring of an external small or medium-sized bearing.

2. The rotational accuracy testing fixture for bearing axial and radial runout according to claim 1, characterized in that: The bottom wall of the load block is coaxially connected with a positioning post. Positioning holes are provided on both the outer ring working block and the inner ring working block. When the load block is engaged with the outer ring working block, the positioning post is inserted into the positioning hole on the outer ring working block. When the load block is engaged with the inner ring working block, the positioning post is inserted into the positioning hole on the inner ring working block.

3. The rotational accuracy testing fixture for bearing axial and radial runout according to claim 2, characterized in that: The positioning post has a first connecting hole, and the outer ring working block and the inner ring working block each have a second connecting hole for communicating with their respective adjacent positioning holes. The connecting structure includes connecting bolts. When the load block is engaged with the outer ring working block, the connecting bolts are threadedly engaged with the first connecting hole and the second connecting hole on the outer ring working block, respectively. When the load block is engaged with the inner ring working block, the connecting bolts are threadedly engaged with the first connecting hole and the second connecting hole on the inner ring working block, respectively.

4. The rotational accuracy testing fixture for bearing axial and radial runout according to claim 2, characterized in that: The outer peripheral wall of the positioning post and the inner wall of the positioning post are connected by a smooth curved surface and have a chamfer.

5. The rotational accuracy testing fixture for bearing axial and radial runout according to claim 1, characterized in that: The support includes a base, which is cylindrical and has an end that is a connection end for mating with the shaft hole of the bearing to be tested in the outside.

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