A measuring tool for detecting the amount of bounce of the outer circle of a UF outer planet wheel relative to the inner arc of the ball track.

Abstract

This utility model provides a measuring tool for detecting the runout of the outer circle of a UF outer star wheel relative to the inner arc track. It includes a base plate and a rotating structure, a clamping and fixing structure, and a measuring structure mounted on the base plate. The rotating structure includes a bearing seat and a rotating shaft. The bearing seat is fixed to the base plate and contains a bearing. The rotating shaft is located in the bearing and rotates relative to the bearing seat. The clamping and fixing structure includes an outer cylinder and a pull bolt. An inner cylinder is located at the top of the outer cylinder, and a reference ring is fitted around the top of the inner cylinder. Multiple rectangular grooves are spaced circumferentially on the top of the reference ring, and steel balls are movably placed in these grooves. The pull bolt includes a top clamping part and a bottom connecting part. The clamping part is in the shape of an inverted frustum, and its outer wall abuts against the steel ball. The connecting part connects to a drive assembly, which drives the pull bolt to move up and down. The measuring structure includes a dial indicator, which is fixed to the upper end of a vertical rod via a cantilever. The vertical rod is located on one side of the bearing seat.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing and testing technology, and in particular relates to a measuring tool for detecting the amount of runout of the outer circle of a UF outer star wheel relative to the inner arc track. Background Technology

[0002] The UF Alien Wheel 100, in terms of its overall shape, is roughly cylindrical, such as... Figure 1 and Figure 2 As shown, the central part has an inner hole, within which six inner arc-shaped ball tracks 110 are evenly distributed. These six inner arc-shaped ball tracks 110 are divided into two groups, with the included angle of the three ball tracks in each group being 120°; the outer circumference includes a first outer circle 120 and a second outer circle 130 with different outer diameters. As an important transmission component, the runout accuracy of the outer circle of the UF outer star wheel 100 relative to the inner arc-shaped ball tracks 110 has a significant impact on the transmission performance and service life of the equipment. In existing technologies, the measurement of the runout of the outer circle of the UF outer star wheel 100 relative to the inner arc-shaped ball tracks 110 often suffers from low measurement accuracy, complex operation, and low efficiency. Some measuring devices struggle to accurately position the inner arc-shaped ball tracks 110, leading to inaccurate measurement references and affecting the reliability of the measurement results; simultaneously, various auxiliary tools are required during workpiece clamping and measurement, increasing the complexity and time cost of measurement, failing to meet the high-efficiency inspection requirements of mass production.

[0003] Therefore, it is necessary to provide a measuring tool for detecting the runout of the outer circle of the UF outer wheel relative to the inner arc of the ball track, so as to realize the rapid detection of the runout of the outer circle of the UF outer wheel relative to the inner arc of the ball track. Utility Model Content

[0004] This invention provides a measuring tool for detecting the runout of the outer circle of a UF outer star wheel relative to the inner arc track, in order to solve the problems of low measurement accuracy and complex operation in the prior art, and to achieve efficient and accurate measurement of the runout of the outer circle of the UF outer star wheel relative to the inner arc track.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] A measuring instrument for detecting the runout of the outer circle of a UF outer celestial wheel relative to the inner arc of the ball track includes a base plate and a rotating structure, a clamping and fixing structure, and a measuring structure mounted on the base plate. The rotating structure includes a bearing housing and a rotating shaft. The bearing housing is fixed to the base plate and contains a bearing. The rotating shaft is disposed in the bearing and rotates relative to the bearing housing. The clamping and fixing structure is mounted on the rotating shaft and rotates with it. The clamping and fixing structure includes an outer cylinder and a bolt. An inner cylinder is disposed at the top of the outer cylinder. A reference ring is fitted around the top of the inner cylinder. Three rectangular grooves are spaced circumferentially at the top of the reference ring, and steel balls are movably disposed in the rectangular grooves. The bolt includes a top clamping part and a bottom connecting part. The clamping part is in the shape of an inverted frustum. The outer wall of the clamping part abuts against the steel ball, and the connecting part is connected to the driving assembly, which drives the pull bolt to move up and down. The measuring structure includes a dial indicator, which is fixed to the upper end of the upright by a cantilever, and the upright is set on one side of the bearing seat. During measurement, the driving assembly drives the pull bolt to move upward, and the steel ball moves towards the center of the reference ring. The workpiece to be measured is inverted and fastened onto the reference ring, with the steel ball located inside the workpiece. The driving assembly drives the pull bolt to move downward, forcing the steel ball to move outward from the reference ring and abut against the inner arc ball track of the workpiece to clamp and fix it. The probe of the dial indicator abuts against the outer circle of the workpiece. Rotating the rotating shaft drives the workpiece to rotate, and the dial indicator measures the runout of the outer circle relative to the inner arc ball track.

[0007] Preferably, the drive assembly includes a spring, a spring seat, a camshaft, a cam, and a drive handle. The connecting part is cylindrical and passes through the inner cylinder to connect to the spring seat. The spring is sleeved outside the connecting part and abuts against both the inner cylinder and the spring seat. The spring provides a downward pulling force to the pull bolt. The camshaft is located below the inner cylinder, and a cam is connected to the outer wall of the camshaft. The cam abuts against the spring seat. The drive handle is connected to the camshaft. Operating the drive handle causes the cam to rotate through the camshaft, thereby pushing the spring seat and the connected pull bolt upward.

[0008] Preferably, a vertical long slot is provided through one side of the outer cylinder, and the drive handle extends from the vertical long slot, allowing operation of the drive handle.

[0009] Preferably, the rectangular grooves are evenly spaced; the rectangular grooves radiate outward from the inner cylinder as the center.

[0010] Preferably, a rotating handle is provided on the outer periphery of the top of the rotating shaft, and the rotating shaft is driven to rotate by operating the rotating handle.

[0011] Preferably, one end of the cantilever can rotate around the upright and be locked, and the other end of the cantilever is equipped with a gauge clip, in which the dial indicator is installed.

[0012] Preferably, the dial indicator consists of two dial indicators, namely a first dial indicator and a second dial indicator, which are fixed to the upright by cantilever arms. The first dial indicator and the second dial indicator are respectively arranged radially along the first outer circle and the second outer circle of the workpiece being measured, and the probes of the first dial indicator and the second dial indicator respectively abut against the first outer circle and the second outer circle of the workpiece being measured.

[0013] Preferably, the bearing housing has bearing mounting grooves at both the top and bottom, and there are two bearings, which are respectively installed in the bearing mounting grooves. The bottom of the bearing housing is provided with a cover plate to prevent the bearings from detaching.

[0014] Preferably, the bearing is a tapered roller bearing, and two tapered roller bearings are installed opposite each other. The shaft passes through the cover plate and is locked by a disc-shaped spring washer, a retaining ring, and a nut.

[0015] Preferably, a keyway is provided on one side of the connecting portion of the bolt along the axial direction, and a threaded hole is provided at the corresponding position of the inner cylinder. A positioning screw is provided in the threaded hole, and the head of the positioning screw is placed in the keyway to prevent the bolt from rotating.

[0016] Compared with the prior art, the technical solution of this utility model embodiment has beneficial effects.

[0017] The UF outer star wheel's runout relative to the inner arc ball track provided by this utility model adopts the three-point centering principle. Three sets of steel balls with an included angle of 120° contact the inner arc ball track, ensuring accurate positioning of the inner hole reference and improving measurement accuracy. The drive assembly moves the pull bolt up and down to control the opening and closing of the steel balls, enabling rapid clamping of the workpiece and simplifying operation. The cantilever can flexibly adjust the position of the dial indicator to adapt to the measurement of workpieces of different specifications, reducing operational difficulty and improving measurement efficiency.

[0018] Furthermore, the tapered roller bearings are installed facing each other and are used in conjunction with disc-shaped spring washers to eliminate gaps and ensure the stability of the shaft rotation;

[0019] Furthermore, the keyway on the side of the pull bolt engages with the positioning screw to prevent the pull bolt from rotating and ensure accurate positioning of the steel ball; the spring provides constant thrust to accommodate slight dimensional deviations in the inner hole of the workpiece, ensuring the stability and reliability of the measurement process. Attached Figure Description

[0020] Figure 1 This is a side view of the UF outer star wheel in an embodiment of this utility model;

[0021] Figure 2 This is a top view of the UF extraterrestrial wheel in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the measuring instrument for detecting the bounce of the outer circle of the UF outer star wheel relative to the inner arc of the ball track in this embodiment of the present invention.

[0023] Figure 4 This is a cross-sectional view of the measuring tool for detecting the amount of runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track in this embodiment of the present invention;

[0024] Figure 5 This is a side view of the measuring instrument for detecting the amount of bounce of the outer circle of the UF outer star wheel relative to the inner arc of the ball track in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100-UF outer ring; 110-inner arc fairway; 120-first outer circle; 130-second outer circle;

[0027] 1-Base plate; 11-Foot;

[0028] 2-Rotating structure; 21-Bearing housing; 22-Shaft; 221-Rotating handle; 23-Bearing; 24-Cover plate; 25-Disc-shaped spring washer; 26-Retaining ring; 27-Nut;

[0029] 3-Clamping and fixing structure; 31-Outer cylinder; 32-Pulley; 321-Pressure part; 322-Connecting part; 33-Inner cylinder; 34-Reference ring; 341-Rectangular groove; 35-Steel ball;

[0030] 4-Drive assembly; 41-Spring; 42-Spring seat; 43-Camshaft; 45-Drive handle;

[0031] 5-Measuring structure; 51-Dial indicator; 511-First dial indicator; 512-Second dial indicator; 52-Cantilever; 53-Upright pole; 54-Indicator clip. Detailed Implementation

[0032] To make the objectives, features, and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining this utility model and are not intended to limit it. Furthermore, the same or similar reference numerals may be used in the drawings to refer to the same or similar elements in different embodiments, and descriptions of the same or similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc., may be omitted.

[0033] Reference Figures 3-5This utility model provides a measuring tool for detecting the amount of runout of the outer circle of a UF outer star wheel relative to the inner arc of the ball track.

[0034] Specifically, the measuring instrument for detecting the runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track includes a base plate 1 and a rotating structure 2, a clamping and fixing structure 3, and a measuring structure 5 mounted on the base plate 1. The rotating structure 2 includes a bearing seat 21 and a rotating shaft 22. The bearing seat 21 is fixed to the base plate 1 through the bearing seat 21, and a bearing 23 is provided in the bearing seat 21. The rotating shaft 22 is located in the bearing 23 and rotates relative to the bearing seat 21. The clamping and fixing structure 3 is located on the rotating shaft 22 and rotates with the rotating shaft 22. The clamping and fixing structure 3 includes an outer cylinder 31 and a pull bolt 32. An inner cylinder 33 is provided at the top of the outer cylinder 31. A reference ring 34 is fitted around the top of the inner cylinder 33. Multiple rectangular grooves 341 are spaced circumferentially on the top of the reference ring 34. Steel balls 35 are movably arranged in the rectangular grooves 341. The pull bolt 32 includes a pressing part 321 at the top and a connecting part 322 at the bottom. The pressing part 321... The measuring structure 5 is shaped like an inverted frustum. The outer wall of the clamping part 321 abuts against the steel ball 35. The connecting part 322 is connected to the driving assembly 4, which drives the pull bolt 32 to move up and down. The measuring structure 5 includes a dial indicator 51, which is fixed to the upper end of the upright 53 by a cantilever 52. The upright 53 is located on one side of the bearing seat 21. During measurement, the driving assembly 4 drives the pull bolt 32 to move upward, and the steel ball 35 moves towards the center of the reference ring 34. The workpiece to be measured is inverted and fastened onto the reference ring 34. The steel ball 35 is located inside the workpiece to be measured. The driving assembly 4 drives the pull bolt 32 to move downward, forcing the steel ball 35 to move outward from the reference ring 34 and abut against the inner arc ball track 110 of the workpiece to be measured, thus clamping and fixing the workpiece to be measured. The probe of the dial indicator 51 abuts against the outer circle of the workpiece to be measured. The rotating shaft 22 drives the workpiece to rotate, and the dial indicator 51 measures the runout of the outer circle relative to the inner arc ball track 110.

[0035] Specifically, the bottom of the base plate 1 is provided with feet 11 for supporting the base plate 1.

[0036] Specifically, tungsten steel blocks are inlaid at the contact points between the steel ball 35 and the pull bolt 32 and the reference ring 34 to reduce wear and further improve measurement accuracy.

[0037] In some embodiments, the drive assembly 4 includes a spring 41, a spring seat 42, a camshaft 43, a cam, and a drive handle 45. The connecting part 322 is cylindrical and passes through the inner cylinder 33 to connect to the spring seat 42. The spring 41 is sleeved on the outside of the connecting part 322 and abuts against the inner cylinder 33 and the spring seat 42 respectively. The spring 41 provides a downward pulling force to the pull bolt 32. The camshaft 43 is located below the inner cylinder 33, and a cam is connected to the outer wall of the camshaft 43. The cam abuts against the spring seat 42. The drive handle 45 is connected to the camshaft 43. Operating the drive handle 45 drives the cam to rotate through the camshaft 43, thereby pushing the spring seat 42 and the pull bolt 32 connected thereto to move upward.

[0038] In some embodiments, a vertical elongated slot is provided through one side of the outer cylinder 31, and the drive handle 45 extends out from the vertical elongated slot, allowing operation of the drive handle 45.

[0039] In some embodiments, the rectangular grooves 341 are arranged at equal intervals; the rectangular grooves 341 radiate outward from the inner cylinder 33 as the center.

[0040] In some embodiments, a rotating handle 221 is provided on the outer periphery of the top of the rotating shaft 22. By operating the rotating handle 221, the rotating shaft 22 is driven to rotate, thereby driving the workpiece to be measured to rotate.

[0041] In some embodiments, one end of the cantilever 52 can rotate around the upright 53 and be locked, and the other end of the cantilever 52 is equipped with a gauge clip 54, in which a dial indicator 51 is installed.

[0042] In some embodiments, the dial indicator 51 consists of two dial indicators, namely a first dial indicator 511 and a second dial indicator 512, which are fixed to the upright 53 by cantilever 52. The first dial indicator 511 and the second dial indicator 512 are respectively arranged radially along the first outer circle 120 and the second outer circle 130 of the workpiece being measured, and the probes of the first dial indicator 511 and the second dial indicator 512 respectively abut against the first outer circle 120 and the second outer circle 130 of the workpiece being measured.

[0043] In some embodiments, the bearing housing 21 is provided with bearing mounting grooves at both the top and bottom ends, and there are two bearings 23 respectively disposed in the bearing mounting grooves. The bottom of the bearing housing 21 is provided with a cover plate 24 to prevent the bearings 23 from dislodging.

[0044] In some embodiments, bearing 23 is a tapered roller bearing, with two tapered roller bearings installed opposite each other, and shaft 22 passing through cover plate 24 and locked by disc-shaped spring washer 25, retaining ring 26 and nut 27.

[0045] In some embodiments, a keyway is provided on one side of the connecting portion 322 of the bolt 32 along the axial direction, and a threaded hole is provided at the corresponding position of the inner cylinder 33. A positioning screw is provided in the threaded hole, and the head of the positioning screw falls into the keyway to prevent the bolt 32 from rotating.

[0046] The measuring instrument for detecting the runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to this embodiment of the utility model is used in practice with the following steps:

[0047] First, operate the drive handle 45 to drive the camshaft 43 to rotate. The cam pushes the pull bolt 32 to move upward, and the steel ball 35 moves inward in the rectangular groove 341 of the reference ring 34. At this time, the workpiece to be measured is placed upside down on the reference ring 34 so that the inner hole is aligned with the steel ball 35.

[0048] Then, the drive handle 45 is released, and the thrust of the spring 41 causes the pull bolt 32 to move downward. The outer surface of the upper end pressing part 321 of the pull bolt 32 drives the steel ball 35 to move outward and embed into the first set of three inner arc ball tracks 110 to achieve centering of the workpiece being measured.

[0049] Next, adjust the cantilever 52 and gauge clamp 54 on the upright 53 so that the first dial indicator 511 and the second dial indicator 512 are respectively set radially along the first outer circle 120 and the second outer circle 130 of the workpiece being measured, and the probes of the first dial indicator 511 and the second dial indicator 512 abut against the first outer circle 120 and the second outer circle 130 of the workpiece being measured, respectively. After preloading to a suitable stroke, lock the cantilever 52 and return the first dial indicator 511 and the second dial indicator 512 to zero.

[0050] The rotating shaft 22 is rotated at a constant speed by operating the rotating handle 221. The dial indicator 51 records the jump of the outer circle relative to the first group of three inner arc ball tracks 110 in real time, and obtains the jump amount corresponding to the inner arc ball tracks 110 of that group.

[0051] After completing the first measurement, operate the drive handle 45 to drive the camshaft 43 to rotate. The cam pushes the pull bolt 32 to move upward, and the steel ball 35 moves inward in the rectangular groove 341 of the reference ring 34. Take out the workpiece to be measured, manually rotate the workpiece to be measured by a certain angle, and put the workpiece to be measured back into the measuring device so that the second set of three inner arc ball tracks 110 contact the steel ball 35. Repeat the above measurement steps to obtain the runout corresponding to the second set of inner arc ball tracks 110.

[0052] Finally, the runout values ​​obtained from the two measurements are compared with the runout tolerance specified for the product. If both are within the tolerance range, the workpiece is deemed qualified; otherwise, it is deemed unqualified.

[0053] Throughout the measurement process, the tapered roller bearings are installed facing each other and the disc-shaped spring washer 25 eliminates the gap, ensuring the rotation accuracy of the shaft 22; the tungsten steel block at the contact position between the steel ball 35 and the pull bolt 32 and the reference ring 34 effectively prevents wear and ensures the long-term accuracy of the measurement; the keyway and positioning screw on the side of the pull bolt 32 prevent the pull bolt 32 from rotating and ensure the stability of the positioning of the steel ball 35.

[0054] In summary, the measuring instrument for detecting the runout of the outer circle of the UF outer star wheel relative to the inner arc ball track in this embodiment of the utility model adopts the three-point centering principle. Three sets of steel balls 35 with an included angle of 120° contact the inner arc ball track 110, ensuring accurate positioning of the inner hole reference and improving measurement accuracy. The drive assembly 4 moves the pull bolt 32 up and down to control the opening and closing of the steel balls 35, enabling rapid clamping of the workpiece and simplifying operation. The cantilever 52 can flexibly adjust the position of the dial indicator 51 to adapt to the measurement of workpieces of different specifications, reducing operational difficulty and improving measurement efficiency.

[0055] Furthermore, the tapered roller bearings are installed facing each other and cooperate with the disc-shaped spring pads 25 to eliminate the gap, ensuring the stability of the rotation of the shaft 22;

[0056] Furthermore, the keyway on the side of the pull bolt 32 engages with the positioning screw to prevent the pull bolt 32 from rotating and ensure the accurate positioning direction of the steel ball 35; the spring 41 provides a constant thrust to accommodate slight dimensional deviations in the inner hole of the workpiece being measured, ensuring the stability and reliability of the measurement process.

[0057] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this utility model disclosure, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this utility model disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and may be derived from the technical features of the respective independent claims in any suitable manner rather than solely by the specific combinations listed in the claims.

Claims

1. A detection gauge for UF outer star wheel outer circle relative to inner arc spherical track runout, characterized in that, The device includes a base plate and a rotating structure, a clamping and fixing structure, and a measuring structure mounted on the base plate. The rotating structure includes a bearing housing and a rotating shaft. The bearing housing is fixed to the base plate and contains a bearing. The rotating shaft is disposed in the bearing and rotates relative to the bearing housing. The clamping and fixing structure is disposed on the rotating shaft and rotates with the shaft. The clamping and fixing structure includes an outer cylinder and a pull bolt. An inner cylinder is disposed at the top of the outer cylinder. A reference ring is fitted around the top of the inner cylinder. Three rectangular grooves are spaced circumferentially at the top of the reference ring. Steel balls are movably disposed in the rectangular grooves. The pull bolt includes a top clamping part and a bottom connecting part. The clamping part is in the shape of an inverted frustum, and its outer wall abuts against the steel balls. The connecting part is connected to the driving assembly, which drives the pull bolt to move up and down; the measuring structure includes a dial indicator, which is fixed to the upper end of the upright by a cantilever, and the upright is set on one side of the bearing seat; during measurement, the driving assembly drives the pull bolt to move upward, the steel ball moves towards the center of the reference ring, and the workpiece to be measured is inverted and fastened to the reference ring, with the steel ball located inside the workpiece to be measured. The driving assembly drives the pull bolt to move downward, forcing the steel ball to move outward from the reference ring and abut against the inner arc ball track of the workpiece to be measured, thus clamping and fixing the workpiece to be measured; the probe of the dial indicator abuts against the outer circle of the workpiece to be measured; rotating the rotating shaft drives the workpiece to rotate, and the dial indicator measures the runout of the outer circle relative to the inner arc ball track.

2. The detection gauge for UF outer star wheel outer circle to inner circle arc ball track runout amount according to claim 1, characterized in that, The drive assembly includes a spring, a spring seat, a camshaft, a cam, and a drive handle. The connecting part is cylindrical and passes through the inner cylinder to connect to the spring seat. The spring is sleeved outside the connecting part and abuts against both the inner cylinder and the spring seat. The spring provides a downward pulling force to the pull bolt. The camshaft is located below the inner cylinder, and a cam is connected to the outer wall of the camshaft. The cam abuts against the spring seat. The drive handle is connected to the camshaft. Operating the drive handle causes the cam to rotate through the camshaft, thereby pushing the spring seat and the connected pull bolt upward.

3. The measuring instrument for detecting the amount of runout of the outer circle of the UF outer planet wheel relative to the inner arc of the ball track according to claim 2, characterized in that, A vertical slot is provided through one side of the outer cylinder, and the drive handle extends out from the vertical slot, allowing operation of the drive handle.

4. The measuring instrument for detecting the runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, The rectangular grooves are evenly spaced; the rectangular grooves radiate outward from the inner cylinder as the center.

5. The measuring instrument for detecting the runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, A rotating handle is provided on the outer periphery of the top of the rotating shaft, and the rotating shaft is driven to rotate by operating the rotating handle.

6. The measuring instrument for detecting the amount of runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, One end of the cantilever can rotate around the upright and be locked, and the other end of the cantilever is equipped with a gauge clip, in which the dial indicator is installed.

7. The measuring instrument for detecting the amount of bounce of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, The dial indicator consists of two parts, namely a first dial indicator and a second dial indicator, which are fixed to the upright by cantilever arms. The first dial indicator and the second dial indicator are respectively arranged radially along the first outer circle and the second outer circle of the workpiece being measured, and the probes of the first dial indicator and the second dial indicator respectively abut against the first outer circle and the second outer circle of the workpiece being measured.

8. The measuring instrument for detecting the amount of bounce of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, The bearing housing has bearing mounting grooves at both the top and bottom. There are two bearings, which are respectively installed in the bearing mounting grooves. The bottom of the bearing housing is provided with a cover plate to prevent the bearings from detaching.

9. The measuring instrument for detecting the amount of runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 8, characterized in that, The bearing is a tapered roller bearing, and two tapered roller bearings are installed opposite each other. The shaft passes through the cover plate and is locked by a disc-shaped spring washer, a retaining ring, and a nut.

10. The measuring instrument for detecting the amount of runout of the outer circle of the UF outer star wheel relative to the inner arc of the ball track according to claim 1, characterized in that, A keyway is provided on one side of the connecting part of the bolt along the axial direction, and a threaded hole is provided at the corresponding position of the inner cylinder. A positioning screw is provided in the threaded hole, and the head of the positioning screw is placed in the keyway to prevent the bolt from rotating.

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