Spherical center detector for inner spherical surface of transmission shaft retainer

Abstract

A ball guide rail and a clamping block are fixedly installed on a vertical plate, a sliding block A is installed on the ball guide rail, a dial indicator is installed on the clamping block, a contact of the dial indicator is opposite to the sliding block A, a U-shaped measuring head is fixedly installed on the sliding block A, a steel ball A and a steel ball B are fixedly installed on the U-shaped measuring head, and a guide groove and a receding groove are formed in a working table plate. The guide rod penetrates through the guide groove and is fixedly connected with the working table plate, the sliding block B is connected to the guide rod in a sliding mode, the sliding block B is fixedly provided with two steel balls C used for pushing the retainer to move, the sliding block B is fixedly provided with a push rod, the guide rod is sleeved with the spring B, the two ends of the spring B are connected with the sliding block B and the working table plate in a pressing mode respectively, and the bottom of the U-shaped measuring head is located in the receding groove which is in a T shape. The device can rapidly and accurately measure the ball center value of the inner spherical surface of the retainer, is convenient to adjust, improves the detection efficiency, and can guarantee the detection precision of the ball center of the inner spherical surface of the retainer.

Description

Technical Field

[0001] This utility model relates to a measuring instrument for the center of an inner sphere, specifically a center of an inner sphere detector for a transmission shaft cage. 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 inner sleeve, a cage, steel balls, and an inner sleeve. The inner spherical surface of the cage mates with the outer spherical surface of the inner ring and the outer surface of the inner sleeve. The inner spherical surface of the cage is finished by precision grinding, requiring high accuracy. If the positional dimension accuracy of the center of the inner spherical surface is not up to standard, it will mainly lead to the inner spherical surface of the cage and the outer spherical surface of the inner ring not meeting the technical specifications, resulting in easy wear, shortening the service life of the cage, and causing abnormal noise. Previously, the center of the inner spherical surface of the cage was detected using coordinate measuring machine (CMM). However, the measurement cycle was long, the efficiency was low, production had to be stopped to wait for the CMM measurement results, and it also occupied CMM resources, resulting in a high scrap rate and a lot of waste. Therefore, there is an urgent need on the machining site for an instrument that can efficiently and conveniently measure the position of the center of the spherical surface during the grinding of the inner spherical surface of the cage while ensuring measurement accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a ball center detector for the inner spherical surface of a drive shaft cage. Using this technology, when measuring the ball center of the inner spherical surface of the cage, it is not only convenient to adjust and improves the detection efficiency, but also ensures the detection accuracy of the ball center of the inner spherical surface of the cage.

[0004] The technical solution of this utility model is: a spherical center of gravity detector for a transmission shaft cage, comprising a support column, a worktable, and a vertical plate. The worktable is fixedly connected to the support column, and the vertical plate is fixedly connected to the worktable. A ball bearing guide and a clamping block are fixedly mounted on the vertical plate. A slider A is slidably connected to the ball bearing guide. The clamping block has a slot, and a dial indicator is mounted on the clamping block. The rod of the dial indicator is located in the slot, and the rod of the dial indicator is fastened to the clamping block by a screw B on the clamping block. The contact of the dial indicator is opposite to the slider A. A U-shaped probe is fixedly mounted on the slider A, and the U-shaped probe is fixedly mounted with two corresponding probes for contact with two adjacent windows of the cage. The corresponding surfaces of steel balls A and B are in contact to push slider A to move. The worktable is provided with guide grooves and clearance grooves. A guide rod passing through the guide groove is fixedly connected to the worktable. Slider B, which is installed in the guide groove, is slidably connected to the guide rod. The upper end of slider B is placed above the worktable. Two steel balls C for pushing the cage to move are fixed on slider B. The lower end of slider B is placed below the worktable. A push rod for adjusting the distance between the U-shaped probe and slider B is fixed on slider B. Spring B is fitted on the guide rod. Both ends of spring B are pressed against slider B and the worktable respectively. The bottom of the U-shaped probe is located in the clearance groove, which is T-shaped.

[0005] A connecting block is fixedly connected to the slider A, and screw A passes through the connecting block and is connected to the worktable. Spring A is located between the connecting block and the worktable and is fitted onto screw A.

[0006] The principle of this invention is as follows: A comparative method is used. Specifically, a coordinate measuring machine (CMM) is first used to measure the center of the spherical surface inside the cage. Then, a mark is burned onto the measured cage to serve as a cage sample. The specific value of the center of the spherical surface inside the cage is recorded. Following the cage sample, the push rod is pushed, and spring B retracts, making the distance between steel balls A and B on the U-shaped probe and steel ball C on slider B small enough to allow the cage sample to be placed on the worktable with the reference plane facing downwards. The two adjacent windows of the cage sample are aligned with steel balls A and B on the U-shaped probe. The push rod is released, and under the action of spring B, slider B and its two steel balls C move backwards. Push the cage sample and bring it into contact with steel balls A and B on the U-shaped probe. The slider A, which is fixed to the U-shaped probe, will move under force until steel balls A and B are fully in contact with the cage sample. As slider A moves, the pointer reading on the dial indicator changes. Adjust the dial indicator reading for easy reading. This reading is taken as the true value of the cage sample. Mark the given tolerance range on the dial indicator dial. Push the push rod to remove the cage sample and replace it with the cage to be measured. If the dial indicator reading is within the set tolerance range, the center of the spherical surface inside the cage is qualified; otherwise, it is unqualified and adjustment is required.

[0007] The advantages of this invention are: it can quickly and accurately measure the center value of the sphere inside the cage, which is not only highly efficient but also provides reliable measurement results, reducing the scrap rate and freeing up the coordinate measuring machine. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the spherical center detection instrument for the inner surface of the transmission shaft cage of this utility model.

[0009] Figure 2 yes Figure 1 Top view.

[0010] Figure 3 yes Figure 1 AA-direction cross-sectional view.

[0011] Figure 4 yes Figure 2 The CC section view in the middle.

[0012] Figure 5 This is a diagram of the cage structure.

[0013] Figure 6 yes Figure 5 Top view.

[0014] In the diagram: 1. Support column, 2. Workbench plate, 3. Spring A, 4. Connecting block, 5. Screw A, 6. Slider A, 7. Vertical plate, 8. Ball bearing guide rail, 9. Clamping block, 10. Dial indicator, 11. Rod, 12. Contact, 13. U-shaped probe, 14. Steel ball A, 15. Steel ball B, 16. Slider B, 17. Steel ball C, 18. Guide rod, 19. Push rod, 20. Guide groove, 21. Relief groove, 22. Spring B, 23. Groove, 24. Screw B, 25. Small chamfer, 26. Lower plane of window, 27. Reference plane, 28. Window, 29. Non-reference plane, 30. Large chamfer, 31. Upper plane of window, 32. Inner cylindrical surface, 33. Center of inner spherical surface. Detailed Implementation

[0015] This utility model is a testing instrument for detecting the center of the spherical surface inside the retainer of the constant velocity universal joint drive shaft in automobiles. The following is in conjunction with the attached... Figure 1-6 The embodiments of this utility model are described below.

[0016] A ball center detector for a drive shaft cage includes a support column 1, a worktable 2, and a vertical plate 7. The worktable 2 is fixedly connected to the support column 1, and the vertical plate 7 is fixedly connected to the worktable 2. A ball bearing guide rail 8 is fixedly mounted on the vertical plate 7. A slider A6 is slidably connected to the ball bearing guide rail 8. A clamping block 9 is fixedly connected to the vertical plate 7. The clamping block 9 has a slot 23, and a screw B24 is mounted on the side of the slot 23. The screw B24 is threadedly connected to the clamping block 9. A dial indicator 10 is mounted on the clamping block, and the lever 11 of the dial indicator is positioned... Within the slot 23, the dial indicator rod 11 is fixed to the clamping block 9 by screw B24. The dial indicator contact 12 is opposite to the slider A6. A connecting block 4 is fixed to the slider A6. Screw A5 passes through the connecting block 4 and connects to the worktable 2. Spring A3 is located between the connecting block 4 and the worktable 2 and is fitted onto screw A5. U-shaped probe 13 is fixed to slider A6. Steel ball A14 and steel ball B15 are fixed to U-shaped probe 13 respectively. Steel ball A14 is located on the non-reference surface 29 of the cage. Between the upper plane 31 of the window and the steel ball B15, the steel ball is located between the reference plane of the retainer and the lower plane of the window. The worktable 2 is provided with a guide groove 20 and a relief groove 21. The guide groove 20 is equipped with a slider B16, which is slidably connected to the guide groove 20. The guide rod 18 passes through the guide groove 20 and is fixedly connected to the worktable 2. The guide rod 18 is slidably connected to the sliding hole on the slider B16. The push rod 19 is fixedly connected to the slider B16. The two steel balls C17 are fixedly connected to the slider B16. The height of the two steel balls C17 is located between the reference plane 27 of the retainer and the lower plane 26 of the window, and is symmetrical about the guide rod 18. It is used to push the retainer to move. The spring B22 is fitted on the guide rod 18 and is located between the slider B16 and the worktable 2. The U-shaped probe 13 is located in the relief groove 21. The relief groove 21 is T-shaped, which is to reduce the tail area of ​​the relief groove 21 so that the contact area between the retainer and the worktable is large enough and remains stable during the measurement.

[0017] The function of screw A5 is to limit the upward position of slider A6, so that the position of slider A6 is within a reasonable range that is convenient for measurement (the reasonable range means that the position of slider A6 is 0.3-0.8mm higher than the position of slider A6 when the steel balls A14 and B15 on the U-shaped probe 13 fixed to slider A6 are in contact with the inner spherical surface of the cage).

[0018] The cage is a thin-walled part, typically with six or eight windows 28 for keeping the steel balls in the same plane. To easily identify the reference surface 27 and non-reference surface 29 of the cage, small chamfers 25 and large chamfers 30 are usually machined on the inner cylindrical surface 32. The side with the small chamfer 25 is selected as the reference surface 27 of the cage. The windows 28 of the cage have an upper window plane 31 and a lower window plane 26. The distance between the center point of the inner sphere of the cage and the reference surface 27 is referred to as the center of the inner sphere.

[0019] The working process of this utility model is as follows: First, the center of the spherical surface inside the cage is measured using a coordinate measuring machine. Then, the measured cage is marked as a cage sample. The specific value of the center of the spherical surface inside the cage is recorded. Following the cage sample, push rod 19 is pushed, and spring B22 retracts, so that the distance between steel balls A14 and B15 on U-shaped probe 13 and steel ball C17 on slider B16 is small enough to fit the cage sample onto the worktable 2, with the reference surface 27 facing downwards. The two adjacent windows 28 of the cage sample are aligned with steel balls A14 and B15 on U-shaped probe 13. Push rod 19 is released. Under the elastic force of spring B22, slider B16 and its two steel balls C17 push the cage sample backwards, making the cage... When the sample comes into contact with the steel balls A14 and B15 on the U-shaped probe 13, the slider A6, which is fixed to the U-shaped probe 13, moves under the force of the steel balls A14 or B15 until the steel balls A14 and B15 are fully in contact with the spherical surface inside the cage. The slider A6 then stops moving. As the slider A6 moves, the pointer reading on the dial indicator 10 changes. Adjusting the pointer reading of the dial indicator 10 makes it easier to read. This reading is taken as the true value of the cage sample. The given tolerance range is marked on the dial of the dial indicator 10. Push the push rod 19 to remove the cage sample. The steps are the same as above. Replace it with the cage to be measured. If the reading of the dial indicator 10 is within the set tolerance range, the center of the spherical surface inside the cage is qualified; otherwise, it is unqualified and needs to be adjusted.

Claims

1. A spherical center detection instrument for the inner surface of a drive shaft cage, characterized in that: Includes a support column (1), a workbench (2), and a vertical plate (7). The workbench (2) is fixedly connected to the support column (1), and the vertical plate (7) is fixedly connected to the workbench (2). A ball bearing guide rail (8) and a clamping block (9) are fixedly mounted on the vertical plate (7). A sliding block A (6) is mounted on the ball bearing guide rail (8). The clamping block (9) has a slot (23) and a dial indicator (10) is mounted on the clamping block (9). The rod (11) of the dial indicator is located in the slot (23). The rod (11) of the dial indicator and the clamping block (9) are fastened by screw B (24) on the clamping block (9). The contact (12) of the dial indicator is opposite to the slider A (6). A U-shaped probe (13) is fixed on the slider A (6). A steel ball A (14) is fixed on the U-shaped probe (13) for contacting the corresponding surfaces between the two adjacent windows of the retainer to push the slider A6 to move. The worktable (2) is provided with a guide groove (20) and a clearance groove (21). A guide rod (18) passing through the guide groove (20) is fixedly connected to the worktable (2). A slider B (16) installed in the guide groove (20) is slidably connected to the guide rod (18). The upper end of the slider B (16) is placed above the worktable (2). Two steel balls C (15) for pushing the cage to move are fixedly installed on the slider B (16). 7) The lower end of slider B (16) is placed below the worktable (2). A push rod (19) for adjusting the distance between the U-shaped probe (13) and slider B (16) is fixed on slider B (16). Spring B (22) is fitted on guide rod (18). Both ends of spring B (22) are pressed against slider B (16) and worktable (2) respectively. The bottom of U-shaped probe (13) is located in relief groove (21), which is T-shaped.

2. The spherical center detection instrument for the inner surface of the transmission shaft cage according to claim 1, characterized in that: A connecting block (4) is fixedly connected to the slider A (6), and a screw A (5) passes through the connecting block (4) and is connected to the worktable (2). A spring A (3) is located between the connecting block (4) and the worktable (2) and is fitted onto the screw A (5).

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