Transmission shaft inner ring ball way roundness detection device

Abstract

The invention relates to a roundness detection device for an inner ring ball way of a car transmission shaft, which is characterized in that a bracket A and a bracket B are fixedly arranged on a working table plate, a cylindrical guide hole is formed in the center of the working table plate, an expansion sleeve in sliding connection is arranged in the cylindrical guide hole, a rotating beam in rotating connection is arranged on the bracket A and the bracket B, and a positioning boss is arranged on the outer surface of the expansion sleeve. An inner conical surface is arranged on the inner surface of the expansion sleeve, a threaded hole is formed in the lower portion of the expansion sleeve, a pull rod is installed in the expansion sleeve and connected with the inner conical surface of the expansion sleeve in a sliding mode, a threaded rod portion A on the pull rod is in spiral connection with the threaded hole in the lower portion of the expansion sleeve, and a supporting block is installed in the cylindrical guide hole and opposite to the bottom face of the expansion sleeve. The top of the bolt is fixedly connected with the supporting block, a movably-connected screw C is installed on the working table plate, the top of the screw C penetrates through a hole of the working table plate to be in threaded connection with the expansion sleeve, and a dial indicator is installed on the rotating beam. According to the invention, the roundness value of the inner ring ball way can be rapidly and accurately measured, and the detection efficiency is high.

Description

Technical Field

[0001] The invention relates to a measuring instrument for ball track roundness, in particular to a device for detecting the roundness of an inner ball track of a car transmission shaft. Background Art

[0002] The drive shaft of the car constant velocity universal joint is composed of a fixed end joint, an intermediate shaft and a movable end joint, wherein the fixed end joint is directly connected to the wheel hub of the car wheel, and the movable end joint is directly connected to the differential of the engine. The power of the engine is transmitted to the wheel through the differential, the movable end joint, the intermediate shaft, the fixed end joint and the wheel hub, thereby driving the wheel to rotate. The fixed end joint is mainly composed of an outer ring, a retainer, a steel ball and an inner ring; the movable end joint is mainly composed of an outer sleeve, a retainer, a steel ball and an inner sleeve. The ball track of the inner ring is matched with the ball track of the outer ring through the steel ball. The ball track of the inner ring is completed by hard milling or grinding, and the precision requirement is high. If the roundness accuracy of the ball track of the inner ring is not up to standard, it will cause the inner ring track to not meet the technical specification requirements through the steel ball and the outer ring track, which is easy to wear, shorten the service life of the inner ring, and cause abnormal noise. In the past, the roundness of the inner ring's ballway was measured using three-coordinate measurement, but the measurement cycle was long and the efficiency was low. Production had to be stopped to wait for the three-coordinate measurement results, and the three-coordinate resources were occupied, which was a great waste. At the same time, a considerable number of companies believed that the roundness of the inner ring's ballway was guaranteed by program processing. In fact, due to changes in equipment accuracy, fixture wear and adjustment errors, and blade wear, the inner ring's ballway circle has an out-of-tolerance phenomenon, and it is a potential defect that is difficult to find. Most companies only measure the distance between the ball centers of the relative ballways most of the time, and the measurement of the inner ring's ballway roundness is relatively rare. The out-of-tolerance of the ballway roundness will directly lead to the fixed end section assembly jamming and abnormal noise, which requires a lot of time to investigate and stop production to wait for the problem to be solved. A considerable number of companies have experienced this. Therefore, an instrument that can measure the roundness of the inner ring ballway efficiently and conveniently and can ensure measurement accuracy is urgently needed at the processing site. Summary of the invention

[0003] The purpose of the present invention is to provide a device for detecting the roundness of the inner ring track of a transmission shaft. When the technology is used to measure the roundness of the inner ring track, it is not only convenient to adjust, but also the detection accuracy of the inner ring track roundness can be guaranteed.

[0004] The technical solution of the present invention is: a device for detecting the roundness of the inner ring track of a transmission shaft, comprising a pillar and a worktable, the worktable is fixedly connected to the pillar, a bracket A and a bracket B are fixedly installed on the worktable, a cylindrical guide hole is provided in the center of the worktable, a slidingly connected expansion sleeve is installed in the cylindrical guide hole, a pin B is fixedly installed on the bracket A, a pin C is fixedly installed on the bracket B, the A end of the rotating beam is rotatably connected to the pin B, and the B end of the rotating beam is rotatably connected to the pin C, a positioning boss is provided on the outer surface of the expansion sleeve, an inner conical surface is provided on the inner surface of the expansion sleeve, a threaded hole is provided at the lower part of the expansion sleeve, a pull rod is installed in the expansion sleeve, and a pull rod is provided on the pull rod The outer conical surface of the expansion sleeve is slidably connected to the inner conical surface, 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 dial gauge rod is fixed in the hole C by a screw D on the side wall of the rotating beam, and the rotation plane of the micrometer probe corresponds to the center line of the expansion sleeve in the same plane.

[0005] A bracket C is fixedly installed on the workbench, a hole C is provided on the bracket C, a guide rod is installed on the bracket C, the guide rod is slidably connected to the hole C, a nut with a spiral connection is installed at the tail end of the guide rod, a cylindrical boss is provided on the guide rod, a spring is sleeved on the guide rod located between the cylindrical boss and the bracket C, a steel ball is fixedly connected to the front end of the guide rod, and the steel ball corresponds to the rotation plane of the micrometer probe in the same plane.

[0006] The principle of the present invention is: first, an inner ring whose inner ring track roundness value meets the sample requirements after three-coordinate measurement is burned with a mark as an inner ring sample, and the inner ring sample is mounted on the expansion sleeve so that the reference surface of the inner ring sample is close to the positioning boss, the inner ring sample is tightened by rotating the pull rod through the inner hexagonal sinker, 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 variation of the micrometer until the reading variation 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 variation 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 present invention are: the roundness value of the inner ball track can be measured quickly and accurately, the efficiency is high, and the measurement results are reliable, the scrap rate is reduced, and the three coordinates are liberated; the instrument eliminates potential invisible quality problems and avoids the phenomenon of stopping production to wait for the problem 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 center of the ball track is qualified through the change of the reading of the micrometer: if the reading of the micrometer is large on one side of the center of the ball track and small on the other side, it means that the center of the ball track is biased to the side with the large reading. After adjustment, the readings on both sides are consistent, and the center of the inner ball track is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of a device for detecting roundness of an inner ring track of a transmission shaft according to the present invention.

[0009] Figure 2 yes Figure 1 Top view of the .

[0010] Figure 3 It is a schematic diagram of the structure of the inner ring.

[0011] Figure 4 yes Figure 3 Schematic diagram of the CC cross section.

[0012] In the figure: 1 pillar, 2 workbench, 3 screw A, 4 pin A, 5 hole A, 6 pin B, 7 bracket A, 8 notch A, 9 end of beam A, 10 positioning boss, 11 expansion sleeve, 12 inner cone, 13 inner hexagonal sink, 14 tie rod, 15 outer cone, 16 notch B, 17 end of beam B, 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 gauge rod, 43 ballway, 44 ball center of ballway, 45 reference surface, 46 inner hole, 47 cylindrical expansion hole. DETAILED DESCRIPTION

[0013] The present invention is a device for detecting the roundness of the inner ring track of the fixed end section of a car transmission shaft. Figure 1-4Specifically describe the embodiment of the present invention, the present invention 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 screws A3 and pins A4, the bracket B22 is fixedly connected to the workbench 2 by screws B21 and pins D20, the bracket C37 is fixedly connected to the workbench 2, a cylindrical guide hole 28 is provided in the center of the workbench, and a sleeve 11 is installed in the cylindrical guide hole 28, the bracket A7 is provided with a notch A8, holes A5 are provided on both sides of the notch A8, and pins B6 The two ends are fixedly connected with the hole A5, and the end 9 of the rotating beam A is rotatably connected with 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, and the two ends of the pin C19 are fixedly connected with the hole B18, and the end 17 of the rotating beam B is rotatably connected with the pin C19; the bracket C37 is provided with a hole C30, and the guide rod 33 is slidably connected with the hole C30, and the guide rod 33 is provided with a cylindrical boss 38, and the tail end of the guide rod 33 is provided with a threaded rod B36, and the nut 35 is spirally connected with the threaded rod B, and the guide rod 33 is provided with a threaded rod B36. 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 a positioning boss 10 is provided on the expansion sleeve 11, and an inner conical surface 12 is provided on the expansion sleeve 11. The threaded rod A23 on the pull rod 14 is spirally connected with the threaded hole on the expansion sleeve 11, and an outer conical surface 15 is provided on the pull rod 14. The inner conical surface 12 and the outer conical surface 15 are slidably connected, and the bolt 25 is connected to the cylindrical guide hole 28 on the workbench 2. The workbench 2 is screwed, the top of the bolt 25 is fixedly connected with the support block 24, the support block 24 contacts the expansion sleeve 11, and plays the role of adjusting the height of the expansion sleeve 11. The screw C26 passes through the hole at the bottom of the workbench and is threadedly connected with the expansion sleeve 11, which is used to position the expansion sleeve 11 and the support block 24 close together; the rotating beam 31 is provided with a hole C30, the dial gauge rod 42 is located in the hole C30, and the screw D41 installed on the side wall of the hole C30 is screwed with the rotating beam 31, which is used to fix the dial gauge rod 42. The rotation plane of the probe 40 of the micrometer corresponds to the center line of the expansion sleeve in the same plane.

[0014] The inner ring usually has six or eight ball paths 43, which are composed of arcs or straight lines plus arcs. The present invention is suitable for arc ball paths. The inner ring is provided with an inner hole 46 and a reference surface 45. The inner hole 46 has a cylindrical expansion hole 47 on one side as the reference surface 45.

[0015] The working process of the present invention is as follows: specifically, the inner ring whose roundness value of the inner ring track after three-coordinate measurement meets the sample requirements is first burned with a mark as the inner ring sample, and the inner ring sample is mounted 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 (consistent with the steel ball used in the fixed end section) on the guide rod 33 on the bracket C37 is close to the track opposite to the measured track under the action of the spring 34, so as to make the measured track, the track opposite to the measured track, and the probe 40 of the micrometer in the same plane. The pull rod 14 is rotated through the inner hexagonal sink 13 to tighten the inner ring sample with the expansion sleeve 11, and the rotating beam 31 is swung to make the probe 40 of the micrometer 29 swing 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 drive the support block 24 to adjust the height of the expansion sleeve 11 through the adjusting bolt 25. The screw C26 is locked, and the pull rod 14 is tightened to make the expansion sleeve 11 tighten the inner ring sample. The rotating beam 31 is swung to make the side head of the micrometer 29 swing 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 requirement range, 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 in that: 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 slidably 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), a rotating beam A end (9) of the rotating beam (31) is rotatably connected to the pin B (6), and a rotating beam B end (17) is rotatably connected to the pin C (19), a positioning boss (10) is provided on the outer surface of the expansion sleeve (11), an inner conical surface (12) is provided on the inner surface of the expansion sleeve, a threaded hole is provided at the bottom of the expansion sleeve, 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-connected bolt (25) is installed on the workbench (2). The top of the bolt (25) is fixedly connected to the support block (24). A movably connected 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). The rotating beam is provided with a hole C (30). The dial gauge 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 probe (40) of the micrometer corresponds to the center line of the expansion sleeve in the same plane.

2. The device for detecting roundness of the inner ring track of a transmission shaft according to claim 1, characterized in that: A support C (37) is fixedly mounted on the workbench (2). The support C is provided with a hole C (30). A guide rod (33) is mounted on the support 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 mounted on the guide rod (33). A spring (34) is sleeved on the guide rod (33) between the cylindrical boss (38) and the support 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.

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