Position degree detector for inner sleeve ball groove of transmission shaft

Abstract

A transmission shaft inner sleeve ball groove position degree detector comprises a support A, a support B, a support C and a positioning column which are installed on a working table, a guide rod A is installed on the support A, one end of the guide rod A is in threaded connection with a nut A, the other end of the guide rod A is fixedly connected with a steel ball A, a cylindrical boss A is arranged on the guide rod A, a spring A is installed on the guide rod A in a sleeved mode and located between the cylindrical boss A and the support A, and a guide rod B is installed on the support B and fixedly connected with the guide rod A. One end of the guide rod B is provided with a nut B in threaded connection, and the other end of the guide rod B is fixedly connected with the steel ball B. The guide rod B is provided with a cylindrical boss B in fixed connection. The guide rod B is sleeved with the spring B and located between the cylindrical boss B and the support B. The steel ball A and the steel ball B are opposite to the center line of the positioning column. The support C is provided with a dial gauge, and the end of a gauge rod of the dial gauge is provided with a measuring head. When the technology is used for measuring the position degree of the inner sleeve fairway, the adjustment is convenient, the efficiency is high, and the detection precision of the position degree of the inner sleeve fairway can be ensured.

Description

Technical Field

[0001] This utility model relates to a ball bearing position measuring instrument for drive shaft inner sleeves, specifically a tool for measuring the position of the ball bearings inside the drive shaft of a car. Background Technology

[0002] The constant velocity joint driveshaft of a car consists of a fixed end joint, an intermediate shaft, and a moving end joint. The fixed end joint is directly connected to the wheel hub of the car wheel, and the moving end joint is directly connected to the engine differential. The engine's power is transmitted to the wheels through the differential, moving end joint, intermediate shaft, fixed end joint, and wheel hub, thus driving the wheels to rotate. The fixed end joint mainly consists of an outer ring, a cage, steel balls, and an inner ring; the moving end joint mainly consists of an outer sleeve, a cage, steel balls, and an inner sleeve. The ball tracks of the inner sleeve mate with the ball tracks of the outer sleeve through steel balls. The ball tracks of the inner sleeve are finished by hard milling or grinding, requiring high precision. If the symmetry of the plane containing each pair of relative ball tracks of the inner sleeve with the center of rotation of the outer surface is not accurate, the mating between the inner sleeve ball tracks and the outer sleeve ball tracks will not meet the technical specifications, leading to easy wear, shortening the service life of the inner sleeve, jamming, and abnormal noise. Previously, the positional accuracy of the inner sleeve ball track was measured using a coordinate measuring machine (CMM). However, this method was time-consuming, inefficient, and required production to stop while waiting for the CMM results, resulting in significant waste of CMM resources. Furthermore, many companies believed that the inner sleeve ball track positional accuracy was guaranteed by programming or fixture machining. In reality, due to variations in equipment precision, fixture wear and adjustment errors, and tool wear, the inner sleeve ball track positional accuracy can deviate from the expected range. These deviations are often difficult to detect and can directly lead to assembly jamming and abnormal noises at the moving end, necessitating production stoppages while waiting for the problem to be resolved. Therefore, there is an urgent need for an instrument that can efficiently and conveniently measure the inner sleeve ball track position while ensuring measurement accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a drive shaft inner sleeve ball track position measuring instrument. When using this technology to measure the inner sleeve ball track position, it is not only convenient to adjust and highly efficient, but also ensures the accuracy of the inner sleeve ball track position measurement.

[0004] The technical solution of this utility model is: a transmission shaft inner sleeve ball track position measuring instrument, including a worktable, on which brackets A, B, and C are fixedly mounted, and a positioning column. Bracket A has a hole A, and a slidingly connected guide rod A is installed inside hole A. Both ends of the guide rod A are outside hole A; one end is fitted with a threaded nut A, and the other end is fixedly connected to a steel ball A. A cylindrical boss A is provided on the guide rod A, and a spring A is fitted onto the guide rod A and located between the cylindrical boss A and bracket A. Bracket B has a hole B, and a sliding... A guide rod B is dynamically connected, with both ends of the guide rod B located outside the hole B. One end of the guide rod B is fitted with a threaded nut B, and the other end is fixedly connected to a steel ball B. A cylindrical boss B is fixedly connected on the guide rod B. A spring B is fitted on the guide rod B and located between the cylindrical boss B and the bracket B. Steel balls A and B are aligned with the center line of the positioning column. A dial indicator is mounted on the bracket C, which has a through hole. The part of the dial indicator rod that passes through the through hole is fastened by a screw on the bracket C. A probe is provided at the end of the probe rod, and the probe is aligned with the center line of the positioning column.

[0005] A shim is installed between the worktable and the positioning post. By selecting a shim of appropriate thickness, the height of the inner sleeve can be adjusted.

[0006] The principle of this invention is to fit the inner hole of the inner sleeve onto the positioning post, aligning one pair of opposing ball tracks with steel balls A and B. Under the elastic force of the spring, steel balls A and B contact this pair of ball tracks, and the probe of the dial indicator contacts the outer surface of the inner sleeve, causing a change in the dial indicator reading. Record the dial indicator reading. Rotate the inner sleeve 180 degrees and then fit it onto the positioning post again, causing another change in the dial indicator reading. Record the difference between the two readings. Similarly, measure the remaining two pairs of opposing ball tracks using the same method and record the difference between the measurements of the other two pairs. If these three differences are within the design specifications, the measurement results are acceptable; otherwise, they are unacceptable and adjustments are required.

[0007] The advantages of this invention are: it can quickly and accurately measure the position of the inner sleeve ball track, which is not only efficient but also reliable, reducing the scrap rate and freeing up the coordinate measuring machine; this instrument eliminates potential hidden quality problems and avoids the phenomenon of production stoppage while waiting for the problem to be solved; since the positioning column is made according to the inner hole gauge of the inner sleeve, it can detect whether the inner hole of the inner sleeve is qualified while detecting the position of the inner sleeve ball track. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the drive shaft inner sleeve ball track position measuring instrument.

[0009] Figure 2 yes Figure 1 Top view.

[0010] Figure 3 This is a schematic diagram of the inner sleeve.

[0011] Figure 4 yes Figure 3 Top view.

[0012] Figure 5 yes Figure 4 The CC section view in the middle.

[0013] Figure 6 This is a schematic diagram of the working status of the ball bearing position measuring instrument inside the drive shaft.

[0014] Figure 7 yes Figure 6 A schematic diagram of the structure when the inner sleeve of the ball track comes into contact with the steel ball.

[0015] Figure 8 This is a top-view schematic diagram of the working state of the drive shaft internal circumferential guideway position measuring instrument.

[0016] In the diagram: 1. Support column, 2. Workbench, 3. Bracket A, 4. Nut A, 5. Hole A, 6. Spring A, 7. Cylindrical boss A, 8. Guide rod A, 9. Steel ball A, 10. Positioning post, 11. Washer, 12. Steel ball B, 13. Guide rod B, 14. Cylindrical boss B, 15. Spring B, 16. Bracket B, 17. Hole B, 18. Nut B, 19. Probe, 20. Bracket C, 21. Dial indicator, 22. Through hole, 23. Screw, 24. Indicator rod, 25. Ball track, 26. Outer surface, 27. Inner hole, 28. Contact point, 29. Top clearance, 30. Ellipse. Detailed Implementation

[0017] This utility model relates to a drive shaft inner sleeve ball track position measuring instrument, which is a tool for measuring the position of the inner sleeve ball track of a car constant velocity universal joint drive shaft. The following describes an embodiment of this utility model with reference to the accompanying drawings. The technical solution includes a support column 1 and a worktable 2, with the worktable fixedly connected to the support column 2. A bracket A3, a bracket B16, a bracket C20, and a positioning post 10 are fixedly mounted on the worktable. A gasket 11 is installed between the worktable and the positioning post 10. The bracket A3 has a hole A5, and a guide rod A8 is mounted on the bracket A3. The guide rod A8 is slidably connected to the hole A5, with both ends of the guide rod A8 outside the hole A5. One end of the guide rod A8 is threaded, and a screw-connected nut A4 is mounted on the threaded end of the guide rod A8. The other end of the guide rod A8 is fixedly connected to a steel ball A9. A cylindrical boss A7 is provided on the guide rod A8. A spring A6 is fitted onto the guide rod A8 and located between the cylindrical boss A7 and the bracket A3. The bracket B16 has a hole B17, and a guide rod A6 is mounted on the bracket B16. The guide rod B13 is slidably connected to the hole B17. Both ends of the guide rod B13 are outside the hole B17. One end of the guide rod B13 is threaded, and a nut B18 with a helical connection is installed on the threaded end of the guide rod B13. The other end of the guide rod B13 is fixedly connected to the steel ball B12. A cylindrical boss B14 is provided on the guide rod B13. A spring B15 is fitted on the guide rod B13 and is located between the cylindrical boss B14 and the bracket B16. The steel balls A9 and B12 are opposite to the center line of the positioning post 10. The bracket C20 is provided with a through hole 22. A dial indicator 21 is installed on the bracket C20. The dial indicator rod 24 passes through the through hole 22 and is fastened by a screw 23 on the bracket C20. A probe 19 is provided on the probe 24 and is opposite to the center line of the positioning post 10.

[0018] The inner sleeve described in this utility model typically has six lanes 25, with adjacent lanes intersecting at a certain angle. The inner sleeve has an inner hole 27 and an outer surface 26. The cross-section of the inner sleeve lanes is elliptical 30. When steel ball A9 or steel ball B12 contacts the inner sleeve lanes 25, there are two contact points 28 with the elliptical lanes 25. There is a gap between the steel ball and the elliptical lanes 25, usually called the top gap 29. The elliptical cross-section of the inner sleeve lanes 25 serves two purposes: firstly, the two contact points 28 between the steel ball and the elliptical lanes 25 make the process more stable and wear-resistant; secondly, the top gap 29 between the steel ball and the elliptical lanes 25 facilitates the entry of grease, resulting in more thorough lubrication and wear resistance. The function of springs A6 and B15 is that when the inner sleeve is fitted onto the positioning post 10, guide rods A8 and B13 simultaneously move aside, compressing springs A6 and B15 and pushing steel balls A9 and B12 into contact with the lanes 25.

[0019] The working process of this utility model is as follows: The inner hole 27 of the inner sleeve is fitted onto the positioning post 10, and one pair of opposing ball tracks 25 are aligned with steel balls A9 and B12. Steel balls A9 and B12 are in contact with the pair of ball tracks 25 under the action of springs A6 and B15. The probe 19 of the dial indicator 21 is in contact with the outer surface 26 of the inner sleeve, and the pointer reading on the dial indicator 21 changes. The pointer reading on the dial indicator 21 is recorded. The inner sleeve is rotated 180 degrees and then fitted onto the positioning post 10. The pointer reading on the dial indicator 21 changes again. The pointer reading on the dial indicator 21 is recorded at this time, and the difference between the two readings is recorded. Similarly, the remaining two pairs of opposing ball tracks 25 are measured in the same way, and the difference between the measurements of the other two pairs of ball tracks is recorded. If the differences of these three pairs are within the design specifications, the measurement results are qualified; otherwise, they are unqualified and adjustments are required. By selecting a shim 11 of appropriate thickness, the height of the inner sleeve can be adjusted so that the two steel balls A9 and B12 are aligned with the center height of the inner sleeve. Since the ball track 25 of the inner sleeve is elliptical, it can make contact with two points, either steel ball A9 or steel ball B12, making the contact more reliable and stable, and the measurement value more accurate.

Claims

1. A drive shaft inner sleeve ball track position measuring instrument, characterized in that: The system includes a workbench (2), on which are fixed brackets A (3), B (16), C (20), and positioning pins (10). The bracket A (3) has a hole A (5), in which a slidingly connected guide rod A (8) is installed. Both ends of the guide rod A (8) are outside the hole A (5), one end of which is fitted with a threaded nut A (4), and the other end is fixedly connected to a steel ball A (9). The guide rod A (8) has a cylindrical boss A (7), and a spring A (6) is fitted on the guide rod A (8) and located between the cylindrical boss A (7) and the bracket A (3). The bracket B (16) has a hole B (17), in which a slidingly connected guide rod B (13) is installed. Both ends of the guide rod B (13) are outside the hole B (17), and one end of which is fitted with a threaded nut. B (18), the other end is fixed to steel ball B (12), the guide rod B (13) is provided with cylindrical boss B (14), spring B (15) is fitted on the guide rod B (13) and located between cylindrical boss B (14) and bracket B (16), steel ball A (9) and steel ball B (12) are opposite to the center line of positioning column (10), the bracket C (20) is equipped with dial indicator (21), the bracket C (20) is provided with through hole (22), the part of dial indicator rod (24) passing through through hole (22) is fastened by screw (23) on bracket C (20), the end of dial indicator rod (24) is provided with probe (19), the probe is opposite to the center line of positioning column (10).

2. The drive shaft inner sleeve ball track position measuring instrument according to claim 1, characterized in that: A gasket (11) is installed between the workbench (2) and the positioning post (10).

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