A bearing radial clearance measuring device

Abstract

This invention discloses a radial clearance measuring device for bearings. Its structure includes a base, a dial indicator, and a movable support. At both ends of the base are a dial indicator clamp and a guide seat, respectively, with the dial indicator detachably fixed to the clamp. The movable support is detachably fixed to the center of the base to support the object being measured. The guide seat has a movable groove, within which a top shaft engages to apply radial pressure to the object being measured. Compared with existing technologies, this invention, in terms of internal fixation, uses a pre-opened movable support to hold the bearing in place. In terms of external pressure, the outer ring of the bearing is quickly tightened by pulling out and releasing the top shaft, thereby obtaining a reading. It also facilitates measurement by rotating the bearing while the top shaft is tightened. Furthermore, simply pulling out and releasing the top shaft allows for readjustment of the bearing's installation angle and orientation, making it more convenient and faster to perform measurements in multiple clamping operations. The clamping process can be directly controlled by the operator.

Description

Technical Field

[0001] This invention relates to the field of measuring equipment, specifically a device for measuring the radial clearance of a bearing. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. To ensure the quality of bearings, it is necessary to measure various technical parameters, including the crucial radial clearance value. Radial clearance refers to the gap between the rolling elements of the bearing and the inner and outer races that mate with it. It directly affects the bearing's operating performance and is closely related to the bearing's lifespan, temperature, vibration, and noise during operation. Therefore, the acceptable value of the radial clearance of bearings must be within a certain range.

[0003] Currently, in existing bearing radial clearance measurement equipment, a boss with a diameter smaller than the inner diameter of the bearing being measured is usually used to support the bearing being tested. During testing, a top shaft is used to directly support the bearing on the boss, and then the probe of a dial indicator is used to hold the bearing at the other end of the top shaft to read the radial clearance value.

[0004] In this method, to ensure that the clearance data can be fully measured, the pressure applied by the top shaft is relatively large, and cylinders are often used for clamping. Frequent restarts are required when installing and testing the bearing. Furthermore, because the bearing inner ring and the boss have different diameters, they are mostly in line contact. To prevent them from shifting under the pressure of the top shaft, a structure that can be opened is formed by the cylinder and the boss to open and hold the bearing inner ring, or a clamping method is used to press the bearing inner ring in place. As can be seen, this method makes the bearing installation process during testing cumbersome and slow in terms of external pressure and internal fixation. Since bearing testing is mostly batch testing, the complex clamping and disassembly will cause great inconvenience to use.

[0005] For example, in the Chinese utility model patent No. 201220110211.7 entitled "Bearing Radial Clearance Measuring Device," the technical solutions disclosed for external pressing and internal fixing are as follows: "The cylinder actuates to move the push rod upward, directly to the outer ring of the bearing being tested," and "Then the left and right cylinders reset, and under the action of the upper and lower springs, the measuring hook moves upward, and the ceramic ball on it abuts against the inner ring of the bearing being tested, and the bearing being tested is clamped by the upper and lower points." During the test, the outer ring of the bearing is difficult to move under the pressure of the cylinder, making the rotational testing method... Unusable, the cylinder needs to be released and re-clamped. When using a dial indicator to read the other side after releasing the cylinder, a multi-clamping method is required to test data at different positions. This requires frequent opening and closing of the cylinder. Since the external pressure and internal fixation are performed by two separate cylinders, there are at least two control buttons. The switches need to be pressed during installation and clamping, and different switches need to be controlled according to different situations. The installation process is still quite cumbersome and slow. Bearing tests are mostly batch tests, and the complex clamping and disassembly will cause great inconvenience to use. Summary of the Invention

[0006] To address the above problems, the present invention provides a device for measuring the radial clearance of a bearing.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a radial clearance measuring device for bearings, comprising a base, a dial indicator, and a movable support. The base has a dial indicator clamp and a guide seat at both ends, with the dial indicator clamp being horizontally higher than the center of the base. The dial indicator is detachably fixed to the dial indicator clamp, and the movable support is detachably fixed to the center of the base for supporting the object being measured. The probe on the dial indicator points towards the movable support. The guide seat has a movable groove with its axis pointing towards the movable support. A top shaft engages within the movable groove for applying radial pressure to the object being measured supported on the movable support.

[0008] The part of the top shaft that engages with the movable groove on the guide seat is a sliding shaft. The rear end of the sliding shaft is provided with a handle, and the front end of the sliding shaft is provided with a top head for abutting against the object being measured held on the movable support. The front end of the sliding shaft near the top head is provided with a threaded part, and a nut is provided on the threaded part through threaded engagement. A spring is nested on the sliding shaft between the nut and the guide seat.

[0009] Furthermore, the rear end of the sliding shaft near the handle is provided with a flat groove, which is a flat plane milled downward in the direction of the axis of the sliding shaft. The flat groove is provided on the sliding shaft along the axis of the sliding shaft, and the guide seat is provided with a limiting pin that abuts against the flat groove.

[0010] Preferably, the nut has a threaded hole and a bolt on its side end, and the tail of the bolt abuts against the threaded portion, thereby fixing the nut on the threaded portion and preventing the nut from loosening on the threaded portion due to the continuous action of the spring force.

[0011] Furthermore, the top of the main body of the movable support is provided with a support portion. The diameter of the support portion is smaller than that of the main body of the movable support. The height of the support portion is located on the axis of movement of the probe or the top head. A dividing groove is formed from the top of the support portion to the main body of the movable support. The position of the dividing groove is not located on the axis of the support portion. The support portion is divided into two parts by the dividing groove, which are a fixed end and a movable end. The width of the fixed end is greater than the width of the movable end. The fixed end is located at the end closer to the top head.

[0012] The movable support below the fixed end is provided with a tensioning hole pointing to the dividing groove and the movable end. The tensioning hole is threaded and a set screw is connected to it by the thread. The set screw in the tensioning hole extends out from the dividing groove and presses against the movable end, thereby widening the gap between the movable end and the fixed end.

[0013] Preferably, the base on which the movable support is located is provided with locking holes on both sides. The locking holes are symmetrically arranged on both sides of the base and the axis of symmetry is arranged along the length of the base. The axis of the locking holes all points to the axis of the movable support. The locking holes are provided with threads and set screws are connected to the locking holes through the threads. The angle between the locking holes and the axis of symmetry is in the range of 30°-45°.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Compared with existing technologies, this invention utilizes a spring-driven adjustable spring shaft to press the bearing onto a pre-openable movable support during bearing testing. Internally, the bearing is secured by the pre-opened, two-lobed movable support. Externally, the bearing's outer ring is quickly tightened by pulling out and releasing the shaft, allowing for rapid reading acquisition. Measurement is conveniently performed by rotating the bearing while the shaft is tightened. Furthermore, it eliminates the need to manually activate or deactivate the cylinders, and avoids the need to control different switches depending on the situation. Simply pulling out and releasing the shaft allows for readjustment of the bearing's installation angle and orientation. This makes measurement using a multi-clamping method more convenient and faster, and the operator can directly control the clamping process. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the measuring device of the present invention.

[0017] Figure 2 This is a schematic diagram of the exploded structure of the top shaft.

[0018] Figure 3 This is a front structural diagram of the top shaft and movable support.

[0019] Figure 4 A three-dimensional structural diagram showing the fit between the movable support and the base.

[0020] Figure 5 This is a schematic diagram of the front section structure of the movable support.

[0021] Figure 6 A frontal schematic diagram showing the measurement process involving the movable support, probe, and top shaft.

[0022] In the diagram: 1. Base; 1a. Watch holder; 1b. Guide seat; 1c. Limit pin; 1d. Locking hole;

[0023] 2. Movable support; 2a. Support; 2b. Dividing groove; 2c. Tensioning hole; 2a1. Fixed end; 2a2. Movable end;

[0024] 3. Dial indicator; 31. Stylus;

[0025] 4. Top shaft; 41. Top head; 42. Sliding shaft; 43. Handle; 44. Spring; 45. Nut; 42a. Threaded part; 42b. Flat groove part;

[0026] 5. Set screws. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the preferred embodiments of this invention are further described below in conjunction with specific implementation methods and accompanying drawings.

[0028] This invention provides a device for measuring the radial clearance of a bearing, such as... Figures 1-2 As shown, its structure includes a base 1, a dial indicator 3, and a movable support 2. The bottom of the base 1 can be made into a large contact surface, or a plate can be fixed at the bottom of the base 1 as a base, so as to make it more stable during use. At both ends of the base 1, there are dial indicator clamps 1a and guide seats 1b with a horizontal height higher than the middle of the base 1, respectively. The movable support 2, which is used to support the object to be measured, is detachably fixed in the middle of the base 1. The dial indicator 3, which is used to measure the object to be measured, is detachably fixed on the dial indicator clamp 1a. During installation, the probe 31 on the dial indicator 3 should be aligned with the direction pointing to the movable support 2. The guide seat 1b has a movable groove with its axis pointing to the movable support 2. A top shaft 4 for applying radial pressure to the object to be measured on the movable support 2 is engaged in the movable groove.

[0029] In a specific embodiment of the external clamping aspect, namely the aspect of setting the top shaft 4, the part of the top shaft 4 that engages with the movable groove on the guide seat 1b is a sliding shaft 42. A handle 43 is provided at the rear end of the sliding shaft 42 for easy manual pulling out of the top shaft 4. A top head 41 is provided at the front end of the sliding shaft 42 for abutting against the object being measured supported on the movable support 2. A threaded portion 42a is provided at the front end of the sliding shaft 42 near the top head 41. A nut 45 is threaded onto the threaded portion 42a. A spring 44 is nested between the nut 45 and the guide seat 1b on the sliding shaft 42. The nut 45 transmits the elastic force applied by the spring 44 to the sliding shaft 42. Therefore, the extension and retraction of the spring 44 and its elastic force can be controlled by the movement of the nut 45 in the threaded portion 42a. The top head 41 can be configured as follows: Figure 2 The design shown is a straight-edged recessed shape. The resultant force generated by the two straight edges of the recessed top 41 on the outer ring of the bearing is directed towards the axis of the movable support 2, thereby ensuring that the top shaft 4 applies sufficient force while making the bearing more stable after being subjected to force.

[0030] Meanwhile, in a specific embodiment of the internal fixing aspect, namely the aspect of setting a support or boss, the top of the main body of the movable support 2 is provided with a support 2a. The diameter of the support 2a is smaller than that of the main body of the movable support 2. The height of the support 2a is located on the axis of movement of the probe 31 or the top head 41. A dividing groove 2b is opened from the top of the support 2a to the main body of the movable support 2. The position of the dividing groove 2b is not located on the axis of the support 2a. The support 2a is divided into two parts by the dividing groove 2b, which are a fixed end 2a1 and a movable end 2a2. The width of the fixed end 2a1 is greater than the width of the movable end 2a2. The fixed end 2a1 is located at the end closer to the top head 41.

[0031] The movable support 2 below the fixed end 2a1 is provided with a tensioning hole 2c pointing to the dividing groove 2b and the movable end 2a2. The tensioning hole 2c is provided with a thread, and a set screw 5 is connected to the tensioning hole 2c by the thread. The set screw 5 in the tensioning hole 2c extends out from the dividing groove 2b and presses against the movable end 2a2, thereby widening the distance between the movable end 2a2 and the fixed end 2a1.

[0032] In practical use, the handle 43 is squeezed to pull open the top shaft 4, and the bearing is placed on the movable support 2. The bearing is supported by the fixed end 2a1 and the movable end 2a2. If the inner diameter of the bearing is large, the movable end 2a2 can be slightly opened by tightening the set screw 5 in the tightening hole 2c. After the bearing is fixed, the top shaft 4 is released, and the spring 44 presses against the nut 45, thereby pushing the top shaft 4 towards the movable support 2. The object to be measured, i.e., the bearing, is pressed against the movable support 2 by the top head 41. As is known, at this time, the gap between the outer and inner rings of the bearing near the top head 41 is tightened by the top head 41, thereby opening the gap on the opposite side of the bearing. Since the opposite side abuts against the probe 31, the gap distance will be reflected on the dial indicator 3 through the probe 31. To obtain the bearing clearance data, since the top shaft 4 is pressed against the movable support 2 by the spring 44, it is easier for the outer ring of the bearing to rotate while ensuring sufficient clamping force. This allows for the radial clearance measurement method to be performed even when the outer ring is clamped. Similarly, if multiple clamping tests are required, or if it is only necessary to change the clamp, simply pinch the handle 43 to pull the top shaft 4 away, remove the bearing, change its position, and reinsert it. When the spring 44 is subjected to compression and release operations for a long time, in order to ensure that the spring 44 has sufficient elasticity, the nut 45 on the threaded part 42a can be rotated to compress the spring 44 more tightly, thereby increasing the force applied to the bearing by the top shaft 4 and preventing the spring 44 from losing elasticity due to frequent use, which would affect the measurement.

[0033] It should be noted that while supporting the bearing, the fixed end 2a1 also needs to withstand the pressure from the top shaft 4. Those skilled in the art know that high-strength materials such as steel and tungsten steel can be used, and the critical stress value for deformation of the fixed end 2a1 should be greater than the pressure value of the top shaft 4. Meanwhile, in the step of opening the movable end 2a2 slightly by tightening the set screw 5 in the tightening hole 2c, the movable end 2a2 only needs to be opened to a degree sufficient to support the inner ring of the bearing, so that the bearing can be pulled out and installed without needing to readjust the set screw 5 in the tightening hole 2c.

[0034] In summary, compared with the prior art, this embodiment, while ensuring sufficient clamping force, uses the spring 44 to drive the adjustable spring 44 of the top shaft 4 to press the bearing onto the pre-openable movable support 2. Internally, the bearing is secured by pre-opening the fixed end 2a1 and movable end 2a2, which are divided into two halves. Externally, the bearing outer ring is quickly tightened and released by pulling out and releasing the top shaft 4. A reading can be obtained the moment the top shaft 4 is tightened, and the bearing can be rotated for measurement while the top shaft 4 is tightened. Furthermore, since there is no need to separately start and stop the cylinders, simply pulling out and releasing the top shaft 4 allows for readjustment of the bearing's installation angle and orientation. There is no need to press switches or control different switches depending on the situation. The clamping process can be directly controlled by the operator, making the operation faster and more convenient.

[0035] This embodiment provides a preferred implementation. The rear end of the sliding shaft 42 near the handle 43 is provided with a flat groove 42b. The flat groove 42b is a flat surface milled downward in the direction of the axis of the sliding shaft 42. During processing, the flat groove 42b can be milled out by a milling machine. It can be seen that one end of the flat groove 42b is in contact with the handle 43, and the other end forms a stepped transition with the middle of the sliding shaft 42. The flat groove 42b is provided on the sliding shaft 42 along the axis of the sliding shaft 42. The guide seat 1b is provided with a limiting pin 1c that abuts against the flat groove 42b, thereby restricting the degree of freedom of the sliding shaft 42 to rotate along the axis within the guide seat 1b, maintaining the position of the top head 41, and ensuring that the pressure and pressure direction applied to the bearing repeatedly and each time remain consistent.

[0036] This embodiment provides a preferred implementation where the nut 45 has a threaded hole and a bolt on its side. The tail of the bolt abuts against the threaded portion 42a, thereby fixing the nut 45 on the threaded portion 42a and preventing the nut 45 from loosening on the threaded portion 42a due to the continuous action of the spring force 44.

[0037] This embodiment provides a preferred implementation. Locking holes 1d are provided on both sides of the base 1 where the movable support 2 is located. The locking holes 1d are symmetrically arranged on both sides of the base 1, with the axis of symmetry along the length of the base 1. The axis of the locking holes 1d points towards the axis of the movable support 2. The locking holes 1d are threaded, and set screws 5 are connected to them via the threads. The angle between the locking holes 1d and the axis of symmetry is within the range of 30°-45°. Through the cooperation of the symmetrical locking holes 1d and set screws 5 on both sides, the movable support 2 is pressed against the through hole in the middle of the base 1 along the length of the base 1 and the length of the top shaft 4. This ensures that the central axis of the support 2a of the movable support 2 falls as completely as possible on the axis of movement of the probe 31 or the top head 41, thereby ensuring the accuracy of the measurement position.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A radial clearance measuring device for bearings, comprising a base, a dial indicator, and a movable support, characterized in that... The base has a gauge clamp and a guide seat at both ends, with the gauge clamp being horizontally higher than the middle of the base. The dial indicator is detachably fixed to the gauge clamp. The movable support is detachably fixed in the middle of the base to support the object being measured, and the probe on the dial indicator points in the direction of the movable support. The guide seat is provided with a movable groove whose axis points to the movable support. A top shaft is engaged in the movable groove to apply radial pressure to the object to be measured carried on the movable support. The top of the main body of the movable support is provided with a support, the diameter of which is smaller than that of the main body of the movable support, and the height of which is located on the axis of movement of the probe or the tip. A dividing groove is provided from the top of the support to the main body of the movable support. The dividing groove is not located on the axis of the support. The support is divided into two parts by the dividing groove, which are a fixed end and a movable end. The width of the fixed end is greater than the width of the movable end. The fixed end is located at the end closer to the top. The movable support below the fixed end is provided with a tensioning hole pointing to the dividing groove and the movable end. The tensioning hole is provided with a thread, and a set screw is connected to the tensioning hole by the thread. The part of the top shaft that engages with the movable groove on the guide seat is a sliding shaft. The rear end of the sliding shaft is provided with a handle, and the front end of the sliding shaft is provided with a top head for abutting against the object being measured held on the movable support. The front end of the sliding shaft near the top head is provided with a threaded part, and a nut is provided on the threaded part through threaded engagement. A spring is nested on the sliding shaft between the nut and the guide seat. The nut has a threaded hole and a bolt on its side, and the tail of the bolt abuts against the threaded part.

2. The radial clearance measuring device for a bearing according to claim 1, characterized in that: The rear end of the sliding shaft near the handle is provided with a flat groove. The flat groove is a flat plane milled downward in the axial direction of the sliding shaft. The flat groove is provided on the sliding shaft along the axial direction of the sliding shaft. The guide seat is provided with a limiting pin that abuts against the flat groove.

3. The radial clearance measuring device for a bearing according to claim 1, characterized in that: Locking holes are provided on both sides of the base where the movable support is located. The axis of the locking holes points to the axis of the movable support. The locking holes are threaded and a set screw is connected to the locking holes through the thread.

4. The radial clearance measuring device for a bearing according to claim 3, characterized in that: The locking holes are symmetrically arranged on both sides of the base, and the axis of symmetry is arranged along the length of the base. The angle between the locking holes and the axis of symmetry is in the range of 30°-45°.

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