A device for detecting axial play of a cylindrical roller bearing of NUP type

Abstract

This utility model discloses an axial clearance detection device for NUP type cylindrical roller bearings, relating to the field of bearing testing technology. It includes a support fixture and a fixture cover. The support fixture includes an inner ring support seat for supporting the inner ring of the bearing and an outer ring support seat for supporting the outer ring of the bearing. The inner ring support seat has a stepped shaft structure with external threads on its large diameter section. The bearing to be tested is slidably fitted onto the small diameter section of the inner ring support seat. The outer ring support seat has an annular structure with internal threads on its inner side that mate with the external threads. The fixture cover includes an inner ring cover and an outer ring cover. Both the inner ring cover and the inner ring support seat have through holes. It also includes bolts and wing nuts for fixing the inner ring of the bearing. This utility model has a simple structure, high detection accuracy, low manufacturing cost, low requirements for testing personnel, and eliminates the need to disassemble the bearings, allowing for rapid batch testing with a single installation.

Description

Technical Field

[0001] This utility model relates to the field of bearing testing technology, specifically to an axial clearance testing device for NUP type cylindrical roller bearings. Background Technology

[0002] In modern industrial production, NUP cylindrical roller bearings are widely used as key components in various rotating machinery systems. Their performance directly affects the operational stability, reliability, and service life of the equipment. Axial clearance, a core parameter of NUP cylindrical roller bearings, has a decisive impact on load distribution, friction characteristics, and vibration noise during operation. More and more machine tool manufacturers are beginning to pay attention to the influence of cylindrical roller bearing axial clearance on machine tool performance. Therefore, accurate control and detection of axial clearance is of paramount importance for ensuring efficient bearing operation, preventing equipment failures, and improving product quality. The existing technology, CN116907410A, discloses a method for measuring the axial clearance of cylindrical roller bearings, solving the problem of accurate detection of the axial clearance of NUP (Near-Up) cylindrical roller bearings. However, the method using feeler gauges requires two steps: measuring the clearance between the outer ring and the roller, and then between the inner ring and the roller, and finally adding the two measurements to obtain the axial clearance. This method is only suitable for bearings that are not yet assembled. For assembled bearings, the feeler gauge cannot be inserted due to the presence of a retainer, making measurement impossible. Another technique, which involves manually pushing another ring while fixing the inner or outer ring for assembly, suffers from the difficulty of ensuring the smoothness and accuracy of the pushing process. This can easily lead to tilting of the pushed ring, resulting in significant deviations in the test results and failing to meet the accuracy requirements of actual production. In addition, some solutions employing complex intelligent testing instruments, while improving detection accuracy, are limited in their widespread application due to their high manufacturing costs and numerous required components. Utility Model Content

[0003] The purpose of this invention is to provide an axial clearance detection device for NUP type cylindrical roller bearings to solve the problems of low detection accuracy and high cost in the prior art.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: an NUP type cylindrical roller bearing axial clearance detection device, comprising a support fixture and a fixture cover. The support fixture includes an inner ring support seat for supporting the inner ring of the bearing and an outer ring support seat for supporting the outer ring of the bearing. The inner ring support seat is a stepped shaft structure with external threads on its large diameter section. The bearing to be tested is slidably fitted on the small diameter section of the inner ring support seat. The outer ring support seat is an annular structure with internal threads on its inner side that mate with the external threads. The fixture cover includes an inner ring cover for positioning the inner ring of the bearing and an outer ring cover for positioning the outer ring of the bearing. Both the inner ring cover and the inner ring support seat have through holes. The device also includes a bolt and a wing nut for fixing the inner ring of the bearing. The bottom end of the bolt is fixedly mounted on a workbench, and the top end of the bolt passes through the through hole and is threadedly connected to a wing nut for pressing the inner ring cover.

[0005] Furthermore, a handle is installed on the outer wall of the outer ring support.

[0006] Furthermore, the top of the outer ring cap is provided with a protrusion for measuring instrument detection operations.

[0007] Furthermore, the bottom end of the outer ring cap is provided with an annular boss, and the inner sidewall of the annular boss is interference-fitted with the outer surface of the bearing outer ring.

[0008] This utility model has the following beneficial effects: This invention provides an axial clearance detection device for NUP type cylindrical roller bearings, which abandons the traditional method of separately detecting and summing the inner and outer rings. By fixing the inner ring and moving the outer ring back and forth through the thread, the axial position change of the outer ring is detected. This invention has a simple structure, low manufacturing cost, low requirements for testing personnel, and does not require disassembling the bearing. Batch testing can be quickly achieved with a single installation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1. Inner ring support; 2. Outer ring support; 3. Inner ring cap; 4. Outer ring cap; 5. Bolt; 6. Wing nut; 7. Handle; 8. Protrusion. Detailed Implementation

[0010] like Figure 1As shown, an NUP type cylindrical roller bearing axial clearance detection device includes a support fixture and a fixture cover. The support fixture includes an inner ring support 1 for supporting the inner ring of the bearing and an outer ring support 2 for supporting the outer ring of the bearing. The outer ring support 2 has an annular structure and an internal thread on its inner side that mates with the external thread. The outer ring support 2 is threadedly connected to the inner ring support 1 and has a stepped surface at its top for precise mating with the lower end face of the bearing outer ring, ensuring that the outer ring remains stable during detection and related operations; the inner ring support 1... The inner ring support 1 is a stepped shaft structure. The large diameter section is equipped with a high-precision fine-tooth external thread for smooth transmission with the internal thread of the outer ring support 2. The transmission accuracy is high, avoiding transmission instability caused by thread fit errors. It can effectively avoid the problem of outer ring tilting caused by traditional manual pushing of the outer ring, and significantly improve the detection accuracy. The bearing under test is slidably sleeved on the small diameter section of the inner ring support 1. The small diameter section is precisely matched with the inner diameter of the bearing inner ring. The lower end face of the bearing inner ring is tightly fitted with the stepped surface of the inner ring support 1, achieving precise positioning and stable fit.

[0011] The tooling cover includes an inner ring cover 3 for positioning the inner ring of the bearing and an outer ring cover 4 for positioning the outer ring of the bearing. Both the inner ring cover 3 and the inner ring support 1 have through holes. It also includes bolts 5 and wing nuts 6 for fixing the inner ring of the bearing. The bottom end of the bolt 5 is fixedly mounted on the worktable, which is a T-slot platform with transverse and longitudinal T-slots on its upper surface. The bolt 5 is a T-bolt adapted to the T-slot platform. The top end of the bolt 5 passes through the through hole and is threaded to the wing nut 6 for pressing the inner ring cover 3. The inner ring cover 3, through the cooperation of the bolt 5 and the wing nut 6, prevents the inner ring from shifting or loosening during the inspection operation, and effectively avoids damage to the end face of the inner ring, thereby maintaining the surface quality and accuracy of the inner ring and ensuring that the integrity and accuracy of the inner ring are not affected throughout the entire inspection process.

[0012] A handle 7 is installed on the outer wall of the outer ring support 2, providing a convenient and effective point of force application for the operator when rotating the outer ring support 2 by means of the handle 7.

[0013] The top of the outer ring cover 4 is provided with a protrusion 8 for measuring instrument detection operation. The parallelism error between the upper end face of the protrusion 8 and the bottom end of the outer ring cover 4 and the contact area with the outer ring end face of the bearing is extremely small. Specifically, a dial indicator with a graduation value of 0.01mm can be selected as the measuring instrument.

[0014] The bottom end of the outer ring cover 4 is provided with an annular boss. The inner wall of the annular boss is interference-fitted with the outer surface of the bearing outer ring to ensure precise fit with the upper end face of the outer ring of the bearing to be tested. This prevents the outer ring cover 4 from shifting during the pressing operation and ensures the accuracy and stability of the pressing process. The outer ring cover 4 has a certain weight. When the outer ring support 2 is rotated to completely separate it from the bearing, the weight of the outer ring cover 4 can press the bearing outer ring to its limit position.

[0015] During initial assembly, the flat retaining ring of the NUP type cylindrical roller bearing is placed on the inner ring support 1 with the bolt 5 facing downwards. The end face of the outer ring support 2 that contacts the outer ring of the bearing should be lower than the end face of the inner ring support 1 that contacts the flat retaining ring. When the bearing is assembled, the end face of the flat retaining ring should be tightly fitted with the inner ring support 1 first to avoid premature pressure on the outer ring of the bearing, which could lead to positioning misalignment or deformation. This provides axial movement space for the subsequent rotation operation of the outer ring support 2, so that the outer ring of the bearing can be smoothly pushed to its limit position.

[0016] The specific operation process of this utility model is as follows: First, the outer ring support 2 is fitted onto the outside of the inner ring support 1 and connected by threads. A T-bolt 5 of appropriate specification is selected, and the bottom end of the bolt 5 is passed through the T-slot of the T-slot platform, while the top end of the bolt 5 passes through the through hole of the inner ring support 1, so that the inner ring support 1 is placed on the T-slot platform. The bearing to be tested is placed on the inner ring support 1, and the inner ring cover 3 is pressed onto the upper end face of the inner ring of the bearing to be tested through the bolt 5. The inner ring of the bearing to be tested is fixed by tightening the wing nut 6 to prevent displacement or loosening of the inner ring of the bearing during operation. Then, the outer ring cover 4 is installed, so that the dial indicator test end is accurately aligned with the center position of the protruding part on the top of the outer ring cover 4.

[0017] First, manually rotate the outer ring support 2 upwards using handle 7 until it reaches its limit position and can no longer be rotated. At this point, bring the dial indicator's testing end into contact with the center of the protruding part on the top of the outer ring cover 4 and set the test value to zero. Then, manually rotate the outer ring support 2 downwards until it is completely disengaged from the bearing. The outer ring cover 4 will then press the outer ring to another limit position using its own weight. The absolute value of the reading displayed by the dial indicator at this point is the axial clearance of the bearing.

Claims

1. A device for detecting axial clearance of NUP type cylindrical roller bearings, comprising a support fixture and a fixture cover, characterized in that: The supporting fixture includes an inner ring support seat (1) for supporting the inner ring of the bearing and an outer ring support seat (2) for supporting the outer ring of the bearing. The inner ring support seat (1) is a stepped shaft structure with external threads on the large diameter section. The small diameter section of the inner ring support seat (1) is used to slide the bearing to be tested. The outer ring support seat (2) is an annular structure with internal threads that mate with the external threads on the inner side. The fixture cover includes an inner ring cover (3) for positioning the inner ring of the bearing and an outer ring cover (4) for positioning the outer ring of the bearing. Both the inner ring cover (3) and the inner ring support seat (1) have through holes. The fixture also includes a bolt (5) and a wing nut (6) for fixing the inner ring of the bearing. The bottom end of the bolt (5) is fixedly mounted on the workbench. The top end of the bolt (5) passes through the through hole and is threaded with a wing nut (6) for pressing the inner ring cover (3).

2. The axial clearance detection device according to claim 1, characterized in that, A handle (7) is installed on the outer wall of the outer ring support (2).

3. The axial clearance detection device according to claim 1, characterized in that, The top of the outer ring cap (4) is provided with a protrusion (8) for measuring instrument detection operation.

4. The axial clearance detection device according to claim 1, characterized in that, The bottom end of the outer ring cap (4) is provided with an annular boss, and the inner side wall of the annular boss is interference-fitted with the outer surface of the bearing outer ring.

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