Transmission shaft jacket fairway position degree detector
By using a drive shaft outer ball track position measuring instrument, which combines a positioning column and a dial indicator, the problems of low efficiency and insufficient accuracy in measuring the position of the outer ball track in existing technologies are solved. This enables rapid and reliable testing, reduces scrap rate and resource waste, and improves production efficiency.
Patent Information
- Application Number
- CN202520319966.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Existing technologies are insufficient for efficiently and accurately measuring the position of the ball track on the outer sleeve of a constant velocity universal joint drive shaft in a car, leading to potential quality problems and production stoppage risks, and also resulting in significant waste of coordinate measuring machine (CMM) resources.
A drive shaft outer track position measurement instrument was designed. It utilizes a combination structure of positioning column, steel ball and dial indicator. The steel ball is brought into contact with the track by the elastic force of the spring. The position of the outer track is measured by the dial indicator, so as to achieve fast and accurate detection.
It enables rapid and reliable measurement of the position of the outer lane, reduces the scrap rate, frees up coordinate measuring machine resources, avoids potential quality problems and production stoppage risks, and improves production efficiency.
Smart Images
Figure CN223795930U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a ball track position measuring instrument for drive shaft outer sleeve, which belongs to the category of measuring instruments. 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 outer sleeve mate with the ball tracks of the inner sleeve through steel balls. The ball tracks of the outer sleeve are finished by hard milling or grinding, requiring high precision. If the symmetry accuracy of the plane containing each pair of opposite ball tracks on the outer sleeve relative to the center of rotation of the outer surface is not up to standard, the mating between the outer sleeve ball tracks and the inner sleeve ball tracks will not meet technical specifications, leading to easy wear, shortening the service life of the outer sleeve, jamming, and abnormal noise. Previously, the ball track position of the outer casing 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 ball track position was guaranteed by programming or fixture machining. In reality, due to variations in equipment precision, fixture wear and adjustment errors, and tool wear, the ball track position can deviate from the expected tolerances. These deviations are often subtle and difficult to detect, directly causing assembly jamming and abnormal noises at the moving end, necessitating production stoppages while waiting for solutions. Therefore, there is an urgent need for an instrument that can efficiently and conveniently measure the ball track position of the outer casing while ensuring measurement accuracy. Summary of the Invention
[0003] The purpose of this invention is to provide a drive shaft outer track position measuring instrument. Using this technology, when measuring the position of the outer track, it is not only convenient to adjust and highly efficient, but also ensures the accuracy of the outer track position measurement.
[0004] The technical solution of this utility model is: a ball track position measuring instrument for a drive shaft sleeve, including a worktable, on which a positioning post and a bracket are fixedly mounted. The positioning post has a through groove, and on one side of the through groove, the positioning post has a hole A and a recess A; on the other side of the through groove, the positioning post has a hole B and a recess B. A slidingly connected rod A is installed inside the hole A. One end of the rod A is placed in the recess A and fixedly connected to a steel ball A. The other end of the rod A has a cylinder A, which is placed in the through groove. The rod A has a positioning groove A, and a pin A is fixedly mounted on the positioning post, with the protruding end of the pin A placed in the positioning groove A. The hole B contains a slidingly connected rod B. One end of the rod B is placed in the recess B and fixed to the steel ball B. The other end of the rod B is provided with a cylinder B, which is placed in the through groove and opposite to the cylinder A. The rod B is provided with a positioning groove B, and a pin B is fixed to the positioning pin. The protruding end of the pin B is placed in the positioning groove B. The through groove contains a spring, which is fitted onto the cylinder A and the cylinder B. The bracket is provided with a through hole through which the dial indicator rod passes. The relative position between the dial indicator rod and the bracket is fixed by a screw provided on the through hole. The dial indicator rod is provided with a probe, which is aligned with the center line of the positioning pin.
[0005] A shim is installed between the worktable and the positioning post. A shim of suitable thickness can be used to adjust the height of the outer casing.
[0006] The principle of this invention is as follows: Specifically, the inner hole of the outer sleeve is fitted onto the positioning post with the reference surface facing downwards, and one pair of opposing ball tracks is aligned with steel balls A and B. Under the elastic force of the spring, steel balls A and B come into contact with this pair of ball tracks, and the probe of the dial indicator comes into contact with the outer surface of the outer sleeve. The dial indicator reading changes, and this reading is recorded. The outer sleeve is then rotated 180 degrees and fitted onto the positioning post again. The dial indicator reading changes again, and this new reading is recorded. The difference between the two readings is also recorded. Similarly, the remaining two pairs of opposing ball tracks are measured using the same method, and the differences between the measurements of the other two pairs are recorded. 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 outer casing, 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; at the same time, the positioning column of this instrument is made according to the inner hole gauge of the outer casing, so that while detecting the position of the outer casing, it also detects whether the inner hole of the outer casing is qualified. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the structure of the drive shaft outer ball track position measuring instrument.
[0009] Figure 2 yes Figure 1 Sectional view along the AA direction.
[0010] Figure 3 This is a structural diagram of the coat.
[0011] Figure 4 yes Figure 3 The CC section view in the middle.
[0012] Figure 5 This is a diagram showing the position of the jacket on the detector.
[0013] Figure 6 This is a diagram showing the contact between the ball's fairway and the steel ball.
[0014] In the diagram: 1 Pin B, 2 Rod B, 3 Cylinder B, 4 Cylinder A, 5 Spring, 6 Rod A, 7 Pin A, 8 Steel Ball A, 9 Positioning Post, 10 Workbench, 11 Shim, 12 Through Slot, 13 Dial Indicator, 14 Indicator Rod, 15 Through Hole, 16 Screw, 17 Bracket, 18 Probe, 19 Steel Ball B, 20 Support, 21 Outer Cover, 22 Countersunk A, 23 Hole A, 24 Positioning Slot A, 25 Positioning Slot B, 26 Hole B, 27 Countersunk B, 28 Inner Hole, 29 Outer Surface, 30 Ballway, 31 Reference Surface, 32 Contact Point, 33 Top Clearance, 34 Ellipse. Detailed Implementation
[0015] This utility model is a tool for testing the position of the ball track on the outer sleeve of a transmission shaft in a car constant velocity universal joint. The following description, in conjunction with the attached... Figure 1-6This invention describes an embodiment of the present invention. The implementation scheme of the drive shaft outer sleeve ball track position measuring instrument includes a worktable 10, which is supported and fixed by a support column 20. A positioning column 9 and a bracket 17 are fixedly mounted on the worktable 10. The positioning column 9 is used for positioning the outer sleeve 21 of the workpiece being inspected, and the bracket 17 is used to fix a dial indicator 13. A shim 11 is installed between the worktable 10 and the positioning column 9, and the shim is used to adjust the height of the drive shaft outer sleeve. The positioning column 9 has a through groove 12. Holes A23 and recesses A22, and holes B26 and B27 are respectively provided on the positioning column 9 on both sides of the through groove. A rod A6 is slidably connected to hole A23. One end of the rod A6 is fixedly connected to a steel ball A8, which is located in the recess A22. The recess A22 allows the steel ball A8 to move. The other end of the rod A6 has a cylinder A4, which is located in the through groove 12. A positioning groove A2 is provided on the rod A6. 4. A pin A7 is fixedly installed on the positioning post 9 at the position corresponding to the groove of the positioning groove A24. The protruding end of the pin A7 is placed in the positioning groove A24. The rod B2 is slidably connected to the hole B26. One end of the rod B2 is fixedly connected to the steel ball B19, which is located in the recess B27. The other end of the rod B2 is provided with a cylinder B3, which is placed in the through groove 12 opposite to the cylinder A4. The rod B2 is provided with a positioning groove B25. The pin B1 is fixedly connected to the positioning post 9, and one end of the pin B1 is located in the positioning groove B25. The through groove 12 is provided with a spring 5, which is fitted on the cylinder A and the cylinder B3. The bracket 17 is provided with a through hole 15. The dial indicator 13's rod 14 passes through the through hole 15 and is fixed to the relative position between the dial indicator 14 and the bracket 17 by a screw 16 provided on the through hole 15. The dial indicator 14 is provided with a probe 18, which is opposite to the center line of the positioning post 9.
[0016] The outer casing of this utility model typically has six lanes 30, with adjacent lanes intersecting at a certain angle. The outer casing has an inner hole 28 and an outer surface 29. The cross-section of the outer casing lanes is elliptical 34. When steel ball A8 or steel ball B19 contacts the outer casing lanes, there are two contact points 32 with the elliptical lanes. There is a gap between the steel ball and the elliptical lanes, usually called the top gap 33. The purpose of the elliptical cross-section 34 of the outer casing lanes is twofold: firstly, the two contact points 32 between the steel ball and the elliptical lanes make the process more stable and wear-resistant; secondly, the top gap 33 between the steel ball and the elliptical lanes facilitates the entry of grease, resulting in more thorough lubrication and improved wear resistance.
[0017] The working process of this utility model is as follows: Specifically, the inner hole 28 of the outer sleeve 21 of the drive shaft is fitted onto the positioning post 9, with the reference surface 31 facing downwards. One pair of opposing ball tracks 30 is aligned with steel balls A8 and B19. Steel balls A8 and B19 are in contact with the pair of ball tracks 30 under the elastic force of springs A and B5. The probe 18 of the dial indicator 13 is in contact with the outer surface 29 of the outer sleeve, and the pointer reading on the dial indicator changes. The dial indicator pointer reading is recorded. The outer sleeve is rotated 180 degrees and then fitted onto the positioning post 9. The pointer reading on the dial indicator changes again. The dial indicator pointer reading at this time is recorded, and the difference between the two readings is recorded. Similarly, the remaining two pairs of opposing ball tracks are measured in the same way, and the difference between the measurements of the other two pairs of ball tracks is recorded. If these three differences are within the design specifications, the measurement results are qualified; otherwise, they are unqualified and adjustments are required. The shims are used to adjust the height of the outer sleeve so that the two steel balls A8 and B19 are aligned with the center height of the outer sleeve. Since the outer sleeve's ball track is elliptical, it can make contact with either steel ball A8 or steel ball B19 at two points, making the contact more reliable and stable, and the measurement more accurate.
Claims
1. A ball track position measuring instrument for drive shaft outer sleeve, characterized in that: Includes a support column (20) and a worktable (10). The support column 20 is fixedly connected to the worktable. A positioning column (9) and a bracket (17) are fixedly mounted on the worktable (10). The positioning column (9) is provided with a through groove (12). On one side of the through groove (12), the positioning column (9) is provided with a hole A (23) and a recess A (22). On the other side of the through groove (12), the positioning column (9) is provided with a hole B (26) and a recess B (27). A sliding rod A (6) is installed in hole A (23). One end of rod A (6) is placed in recess A (22) and fixed to steel ball A (8). The other end of rod A (6) is provided with cylinder A (4), which is placed in through groove (12). A positioning groove A (24) is provided on rod A (6). A pin A (7) is fixed on positioning pin (9), and the protruding end of pin A (7) is placed in positioning groove A (24). The hole B (26) is filled with... A rod B (2) with a sliding connection is provided. One end of the rod B (2) is placed in the recess B (27) and fixedly connected to the steel ball B (19). The other end of the rod B (2) is provided with a cylinder B (3). The cylinder B (3) is placed in the through groove (12) opposite to the cylinder A (4). The rod B (2) is provided with a positioning groove B (25). A pin B (1) is fixedly connected to the positioning pin (9). The protruding end of the pin B (1) is placed in the positioning groove B (25); the through groove (12) The device contains a spring (5), which is fitted onto cylinder A (4) and cylinder B (3). The bracket (17) has a through hole (15), through which the dial indicator (13) rod (14) passes. The relative position between the dial indicator rod (14) and the bracket (17) is fixed by a screw (16) on the through hole (15). The dial indicator rod (14) has a probe (18), which is aligned with the center line of the positioning column (9).
2. The drive shaft outer raceway position measuring instrument according to claim 1, characterized in that: A gasket (11) is installed between the workbench (10) and the positioning post (9).