Transmission shaft inner ring ball way roundness detection device
By designing a device for detecting the roundness of the inner surface track of a drive shaft and utilizing a micrometer and an expansion sleeve structure, the problems of low efficiency and insufficient precision in measuring the roundness of the inner surface track of a car's drive shaft have been solved. This has enabled rapid and accurate measurement of the inner surface track roundness, reducing the scrap rate and the risk of production stoppage.
Patent Information
- Application Number
- CN202422960087.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing technologies make it difficult to efficiently and accurately measure the roundness of the inner surface raceway of a car's drive shaft. This results in wear, abnormal noise, and production stoppages when the inner surface raceway roundness fails to meet the requirements. Furthermore, it occupies three-coordinate measurement resources and has low measurement efficiency.
A device for detecting the roundness of the inner ring track of a transmission shaft was designed. By using a micrometer and an expansion sleeve structure, the micrometer probe was ensured to swing up and down on the inner ring track by adjusting the expansion sleeve height and swinging the rotating beam. When the reading deviation meets the requirements, the center of the inner ring track coincides with the center of the rotating beam, achieving fast and accurate measurement.
It achieves fast and accurate measurement of the roundness of the inner ring track, reduces the scrap rate, liberates three-coordinate resources, avoids potential quality problems and production stoppage risks, and improves measurement efficiency and accuracy.
Smart Images
Figure CN223346103U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a measuring instrument for ball track roundness, in particular to a device for detecting the roundness of a ball track inside a car transmission shaft. Background Art
[0002] The drive shaft of a car's constant velocity universal joint consists of a fixed end joint, an intermediate shaft, and a movable end joint. The fixed end joint is directly connected to the car's wheel hub, and the movable end joint is directly connected to the engine's differential. The engine's power is transmitted to the wheel through the differential, movable end joint, intermediate shaft, fixed end joint, and wheel hub, thereby driving the wheel to rotate. The fixed end joint mainly consists of an outer ring, a retaining frame, steel balls, and an inner ring; the movable end joint mainly consists of an outer sleeve, a retaining frame, steel balls, and an inner sleeve. The ball track of the inner ring is matched with the ball track of the outer ring through the steel balls. The ball track of the inner ring is completed by hard milling or grinding, which requires high precision. If the roundness accuracy of the inner ring's ball track is not up to standard, the inner ring's ball track will not meet the technical specifications for the match between the steel balls and the outer ring, which will be prone to wear, shorten the service life of the inner ring, and cause abnormal noise. In the past, the roundness of the inner ring's ball track was measured using three-coordinate measurement. However, the measurement cycle was long and inefficient, requiring production to be stopped to await the three-coordinate measurement results. This also occupied three-coordinate resources, resulting in significant waste. Meanwhile, a significant number of companies believed that the roundness of the inner ring's ball track was guaranteed through program processing. In reality, variations in equipment accuracy, fixture wear and adjustment errors, and cutting tool wear can lead to deviations in the inner ring's ball track circularity, potentially creating defects that are difficult to detect. Most companies only measure the distance between the ball centers of the relative ball tracks, while measuring the roundness of the inner ring's ball track relatively infrequently. Defects in ball track roundness can directly lead to stuck and abnormal noises in the fixed end section assembly, requiring significant time for troubleshooting and production suspension pending a resolution. This has been experienced by a significant number of companies. Therefore, an instrument that can efficiently and conveniently measure the roundness of the inner ring's ball track while ensuring measurement accuracy is urgently needed at the processing site. Summary of the Invention
[0003] The purpose of the utility model is to provide a device for detecting the roundness of the inner ring track of a transmission shaft. When the technology is used, when measuring the roundness of the inner ring track, it is not only convenient to adjust but also can ensure the detection accuracy of the roundness of the inner ring track.
[0004] The technical solution of the utility model is: a roundness detection device for the inner ring track of a transmission shaft, comprising a pillar and a work table, the work table is fixedly connected to the pillar, a bracket A and a bracket B are fixedly installed on the work table, a cylindrical guide hole is provided in the center of the work table, a slidingly connected expansion sleeve is installed in the cylindrical guide hole, a pin B is fixed on the bracket A, a pin C is fixed on the bracket B, the beam A end of the rotating beam is rotatably connected to the pin B, and the beam B end is rotatably connected to the pin C, the outer surface of the expansion sleeve is provided with a positioning boss, the inner surface of the expansion sleeve is provided with an inner conical surface, the lower part of the expansion sleeve is provided with a threaded hole, a pull rod is installed in the expansion sleeve, and a pull rod is provided on the pull rod The outer conical surface is slidingly connected to the inner conical surface of the expansion sleeve, and the threaded rod A on the pull rod is spirally connected to the threaded hole at the bottom of the expansion sleeve. A support block is installed in the cylindrical guide hole, and the support block is opposite to the bottom surface of the expansion sleeve. A spirally connected bolt is installed on the workbench, and the top of the bolt is fixedly connected to the support block. A movably connected screw C is installed on the workbench, and the top of the screw C passes through the hole at the bottom of the workbench and is threadedly connected to the expansion sleeve. A micrometer is installed on the rotating beam, and a hole C is provided on the rotating beam. The rod of the micrometer is fixed in the hole C by the screw D on the side wall of the rotating beam. The rotating plane of the micrometer probe corresponds to the center line of the expansion sleeve in the same plane.
[0005] The workbench is fixedly mounted with a bracket C, which is provided with a hole C. A guide rod is mounted on the bracket C, which is slidably connected to the hole C. A nut with a spiral connection is mounted at the tail end of the guide rod. A cylindrical boss is provided on the guide rod, and a spring is mounted on the guide rod between the cylindrical boss and the bracket C. A steel ball is fixedly connected to the front end of the guide rod, which corresponds to the rotation plane of the micrometer probe in the same plane.
[0006] The principle of the present utility model is: first, after three-coordinate measurement, the inner ring whose inner ring track roundness value meets the sample requirements is burned with a mark as the inner ring sample, and the inner ring sample is put on the expansion sleeve so that the reference surface of the inner ring sample is close to the positioning boss, and the pull rod is rotated through the inner hexagonal sink to tighten the inner ring sample, and the rotating beam is swung to make the micrometer probe swing up and down on the ball track of the inner ring sample, and the height of the expansion sleeve is adjusted according to the reading deviation of the micrometer until the reading deviation of the micrometer meets the requirements. At this time, the center of the ball track of the inner ring sample coincides with the rotation center of the rotating beam, and the inner ring to be measured is replaced. If the reading deviation of the micrometer is within the design requirement range, the roundness of the inner ring track is qualified, otherwise it is unqualified and needs to be adjusted.
[0007] The advantages of the utility model are: it can quickly and accurately measure the roundness value of the inner ball track, which is not only highly efficient but also has reliable measurement results, reduces the scrap rate, and frees up the three coordinates; the instrument eliminates potential invisible quality problems and avoids the occurrence of production stoppages waiting for problems to be solved; the instrument can not only measure the roundness value of the inner ball track efficiently and accurately, but also measure whether the ball track center is qualified through the change in the reading of the dial indicator: if the reading of the dial indicator is larger on one side of the ball track center and smaller on the other side, it means that the ball track center is biased to the side with the larger reading. After adjustment, the readings on both sides are consistent, and the inner ball track center is qualified. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The utility model is a structural diagram of a device for detecting roundness of a ring track inside a transmission shaft.
[0009] Figure 2 yes Figure 1 Top view of .
[0010] Figure 3 It is a structural diagram of the inner ring.
[0011] Figure 4 yes Figure 3 Schematic diagram of CC cross section in .
[0012] In the figure: 1 pillar, 2 workbench, 3 screw A, 4 pin A, 5 hole A, 6 pin B, 7 bracket A, 8 slot A, 9 beam A end, 10 positioning boss, 11 expansion sleeve, 12 inner cone, 13 inner hexagonal sink, 14 tie rod, 15 outer cone, 16 slot B, 17 beam B end, 18 hole B, 19 pin C, 20 pin D, 21 screw B, 22 bracket B, 23 threaded rod A, 24 bracket Block, 25 bolt, 26 screw C, 28 cylindrical guide hole, 29 micrometer, 30 hole C, 31 rotating beam, 32 trisection slot, 33 guide rod, 34 spring, 35 nut, 36 threaded rod B, 37 bracket C, 38 cylindrical boss, 39 steel ball, 40 probe, 41 screw D, 42 indicator rod, 43 ball track, 44 ball track center, 45 reference surface, 46 inner hole, 47 cylindrical reaming. DETAILED DESCRIPTION
[0013] The utility model is a device for detecting the roundness of the inner spherical track of the fixed end section of the car transmission shaft. Figure 1-4Specifically describe the embodiment of the utility model, the utility model includes a pillar 1, a workbench 2, the workbench is fixedly connected to the pillar, the bracket A7 is fixedly connected to the workbench 2 by a screw A3 and a pin A4, the bracket B22 is fixedly connected to the workbench 2 by a screw B21 and a pin D20, the bracket C37 is fixedly connected to the workbench 2, the center of the workbench is provided with a cylindrical guide hole 28, the cylindrical guide hole 28 is equipped with an expansion sleeve 11, the bracket A7 is provided with a notch A8, and holes A5 are provided on both sides of the notch A8. The two ends of the pin B6 are fixedly connected to the hole A5, and the end 9 of the rotating beam A is rotatably connected to the pin B6; the bracket B22 is provided with a notch B16, and the two ends of the notch B16 are provided with holes B18, the two ends of the pin C19 are fixedly connected to the hole B18, and the end 17 of the rotating beam B is rotatably connected to the pin C19; the bracket C37 is provided with a hole C30, and the guide rod 33 is slidably connected to the hole C30, and the guide rod 33 is provided with a cylindrical boss 38. The tail end of the guide rod 33 is provided with a threaded rod B36, and the nut 35 is spirally connected to the threaded rod B , the front end of the guide rod 33 is fixedly connected to the steel ball 39, and the spring 34 is sleeved on the guide rod 33 and located between the cylindrical boss 38 and the bracket C37; the expansion sleeve 11 is slidably connected to the cylindrical guide hole 28 on the workbench 2, and the expansion sleeve 11 is provided with a positioning boss 10, and the expansion sleeve 11 is provided with an inner conical surface 12, the threaded rod A23 on the pull rod 14 is spirally connected to the threaded hole on the expansion sleeve 11, and the pull rod 14 is provided with an outer conical surface 15, the inner conical surface 12 and the outer conical surface 15 are slidably connected, and the bolt 25 It is screwed to the worktable 2. The top of bolt 25 is fixedly connected to support block 24, which contacts the expansion sleeve 11 and adjusts its height. Screw C26 passes through a hole in the bottom of the worktable and is threadedly connected to the expansion sleeve 11, securing the expansion sleeve 11 and support block 24. The rotating beam 31 is provided with a hole C30, within which the dial indicator stem 42 is located. Screw D41, mounted on the side wall of hole C30, is screwed to the rotating beam 31 to secure the dial indicator stem 42. The rotation plane of the dial indicator probe 40 is aligned with the centerline of the expansion sleeve.
[0014] The inner ring usually has six or eight ball paths 43, which are composed of arcs or straight lines plus arcs. The utility model is suitable for arc ball paths. The inner ring is provided with an inner hole 46 and a reference surface 45. The side of the inner hole 46 with a cylindrical expansion hole 47 is the reference surface 45.
[0015] The working process of the present utility model is as follows: specifically, the inner ring whose inner ring track roundness value meets the sample requirements after three-coordinate measurement is first burned with a mark as the inner ring sample, and the inner ring sample is put on the expansion sleeve 11, so that the reference surface 45 of the inner ring sample is close to the positioning boss 10, and the steel ball 39 on the guide rod 33 on the bracket C37 (consistent with the steel ball used in the fixed end section) is close to the track opposite to the measured track under the action of the spring 34, so that the measured track, the track opposite to the measured track, and the probe 40 of the micrometer are in the same plane. By rotating the pull rod 14 through the inner hexagonal sink 13, the expansion sleeve 11 tightens the inner ring sample, and the rotating beam 31 is swung so that the probe 40 of the micrometer 29 swings up and down on the ball track of the inner ring sample. If the reading of the micrometer 29 deteriorates beyond the tolerance, it means that the center of the ball track of the inner ring sample is inconsistent with the rotation center of the rotating beam 31. Loosen the pull rod 14, the expansion sleeve 11 loosens the inner ring sample, loosen the screw C26, and adjust the height of the expansion sleeve 11 by driving the support block 24 through the adjusting bolt 25. Tighten the screw C26, tighten the pull rod 14, so that the expansion sleeve 11 tightens the inner ring sample, and swing the rotating beam 31 so that the side head of the micrometer 29 swings back and forth on the ball track of the inner ring sample. If the reading of the micrometer 29 deteriorates to meet the requirements, it means that the center of the ball track of the inner ring sample is consistent with the swing center of the rotating beam 31. Otherwise, continue to adjust according to the above method until the reading of the micrometer 29 deteriorates to meet the requirements. Replace the inner ring of the ball track to be measured. If the reading of the micrometer 29 deteriorates within the design requirements, it means that the roundness of the inner ring ball track is qualified. Otherwise, it is unqualified and needs to be adjusted.
Claims
1. A device for detecting the roundness of the inner raceway of a transmission shaft, characterized by: The invention comprises a support (1) and a workbench (2), wherein the workbench is fixedly connected to the support, a bracket A (7) and a bracket B (22) are fixedly installed on the workbench (2), a cylindrical guide hole (28) is provided at the center of the workbench, a slidingly connected expansion sleeve (11) is installed in the cylindrical guide hole (28), a pin B (6) is fixedly installed on the bracket A (7), a pin C (19) is fixedly installed on the bracket B (22), the rotating beam A end (9) of the rotating beam (31) is rotatably connected to the pin B (6), and the rotating beam B end (17) is rotatably connected to the pin C (19), the outer surface of the expansion sleeve (11) is provided with a positioning boss (10), the inner surface of the expansion sleeve (11) is provided with an inner conical surface (12), the lower part of the expansion sleeve is provided with a threaded hole, a pull rod (14) is installed in the expansion sleeve, and the pull rod (14) is provided with a sliding connection with the inner conical surface (12) of the expansion sleeve. The outer conical surface (15) of the pull rod is spirally connected to the threaded hole at the bottom of the expansion sleeve. A support block (24) is installed in the cylindrical guide hole (28). The support block (24) is opposite to the bottom surface of the expansion sleeve (11). A screw (25) with a spiral connection is installed on the workbench (2). The top of the bolt (25) is fixedly connected to the support block (24). A movable screw C (26) is installed on the workbench (2). The top of the screw C (26) passes through the hole at the bottom of the workbench and is threadedly connected to the expansion sleeve (11). A micrometer (29) is installed on the rotating beam (31). A hole C (30) is provided on the rotating beam. The dial indicator rod (42) is fixed in the hole C (30) by a screw D (41) on the side wall of the rotating beam. The rotation plane of the micrometer probe (40) corresponds to the center line of the expansion sleeve in the same plane.
2. The device for detecting roundness of the inner raceway of a transmission shaft according to claim 1, characterized in that: A bracket C (37) is fixedly mounted on the workbench (2). The bracket C is provided with a hole C (30). A guide rod (33) is mounted on the bracket C. The guide rod is slidably connected to the hole C (30). A nut (35) connected in a spiral manner is mounted on the tail end of the guide rod. A cylindrical boss (38) is provided on the guide rod (33). A spring (34) is mounted on the guide rod (33) between the cylindrical boss (38) and the bracket C (37). A steel ball (39) is fixedly mounted on the front end of the guide rod (33). The steel ball corresponds to the rotation plane of the probe (40) of the micrometer in the same plane.