A differential planetary gear shaft hole concentricity testing fixture

Abstract

This utility model provides a concentricity testing fixture for planetary gear shaft holes in differential gears, relating to the field of concentricity testing technology. It includes: a work plate; a disc at the top and near the center of the work plate; a cross plate fixedly connected to the top of the disc; a vertical cavity at the center of the cross plate; a rotating rod at the center of the vertical cavity; a first bevel gear fitted and fixedly connected to the surface of the rotating rod near the top; and circular holes at all four ends of the cross plate, each containing a movable column. In this utility model, the fixture structure has a certain degree of adaptability. By adjusting the movable columns and related components of the testing head, the extruded rubber block can support and fix the inner wall of the gear body, while the moving testing head can contact the inner wall of the gear body. This can meet the concentricity testing needs of planetary gear shaft holes in various models of differential gears, improving the fixture's reusability and saving equipment investment.

Description

Technical Field

[0001] This utility model relates to the field of concentricity detection technology, and in particular to a fixture for detecting the concentricity of the planetary gear shaft hole of a differential. Background Technology

[0002] In the manufacturing process of automotive differentials, the concentricity of the planetary gear shaft holes is one of the core indicators affecting the differential's transmission performance and service life. As a key component of the automotive transmission system, the planetary gears of the differential need to be precisely matched with the planetary gear shafts through shaft holes to achieve reasonable power distribution and differential function. With the automotive industry's increasing demands for transmission efficiency and operational stability, the control over the machining precision of the planetary gear shaft hole concentricity has become increasingly stringent.

[0003] Existing differential planetary gear shaft hole concentricity testing fixtures and universal testing needles are generally not suitable for testing different models of differentials. When changing product models, it is necessary to readjust and adapt the testing tools, which is inflexible and not conducive to multi-variety, small-batch production. Utility Model Content

[0004] This utility model mainly provides a differential planetary gear shaft hole concentricity testing fixture that can be used to test different models of differentials.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a differential planetary gear shaft hole concentricity testing fixture, comprising: a working plate, a disc provided at the top and near the center of the working plate, a cross plate fixedly connected to the top of the disc, a vertical circular cavity provided inside the cross plate and near the center of the cross plate, a rotating rod provided inside the vertical circular cavity and near the center of the rotating rod, a first bevel gear sleeved and fixedly connected to the surface of the rotating rod and near the top, circular holes provided at all four ends of the cross plate, a movable column embedded inside each of the circular holes, a first screw threadedly connected to the inner end of each movable column, a second bevel gear fixedly connected to one end of each first screw located inside the vertical circular cavity, the first bevel gear meshing with the second bevel gear, and the other end of each movable column... A compressed rubber block is fixedly connected. A gear body is placed on the top of the disc. A square block is fixedly connected to the top of the working plate near one end. A cylinder is embedded in and rotatably connected to the top of each square block. An L-shaped plate is fixedly connected to the top of each cylinder. A groove is formed on the bottom inner wall of each L-shaped plate. A second screw is provided inside the groove. A moving block is sleeved and threaded onto the surface of the second screw. An electric push rod is fixedly connected to the bottom of each moving block. A detection head is fixedly installed at the output end of the electric push rod. An L-shaped annular groove is formed on the top of the working plate. An L-shaped annular plate is embedded inside each L-shaped annular groove. The top of the L-shaped annular plate is fixedly connected to the bottom of the disc. A toothed groove is formed on the inner wall of the L-shaped annular plate near the bottom. A rotating gear is meshed inside the toothed groove.

[0006] Preferably, the bottom of the work plate and near the four corners are all fixedly connected to support legs, and the bottom of the support legs is trapezoidal. Through the above arrangement, the support legs can support the bottom of the work plate.

[0007] Preferably, the bottom of the rotating rod is embedded in the inner wall of the bottom of the vertical circular cavity and rotatably connected to its bearing, the top of the rotating rod penetrates the inner wall of the top of the vertical circular cavity and rotatably connected to its bearing, and a first motor is fixedly connected to the top of the cross plate near the center, and the output end of the first motor is fixedly connected to the top of the rotating rod. With the above arrangement, the first motor can drive the rotating rod to rotate.

[0008] Preferably, the inner walls of the circular holes are symmetrically provided with limiting grooves, and each limiting groove is provided with a limiting block near one end. The limiting blocks are fixedly connected to the surface of the moving column. Through the above arrangement, the limiting blocks and limiting grooves can limit the movement of the moving column.

[0009] Preferably, one end of the second screw is rotatably connected to a bearing on the inner wall of one end of the groove, and the other end of the second screw passes through the inner wall of the other end of the groove and is rotatably connected to its bearing. A third motor is fixedly connected to one side wall of the L-shaped plate, and the output end of the third motor is fixedly connected to one end of the second screw. With the above arrangement, the third motor can drive the second screw to rotate.

[0010] Preferably, a second motor is fixedly connected to the bottom of the working plate, and the output end of the second motor passes through the working plate and is fixedly connected to the rotating gear. With the above arrangement, the second motor can drive the rotating gear to rotate.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, the inspection fixture structure has a certain adaptability. By adjusting the moving column and related components of the inspection head, the extruded rubber block can be fixed to the inner wall of the gear body. At the same time, the moving inspection head can be attached to the inner wall of the gear body, which can meet the concentricity inspection requirements of planetary gear shaft holes of various types of differentials, improve the reuse rate of the inspection fixture, and save equipment investment.

[0013] 2. In this utility model, with the help of an automated structure driven by a motor and mechanical transmission, the differential clamping, inspection position adjustment and data acquisition can be completed quickly, which greatly shortens the detection time of the concentricity of a single differential shaft hole, adapts to the high-efficiency quality inspection needs of large-scale production and improves the overall production efficiency. Attached Figure Description

[0014] Figure 1 This utility model provides an overall three-dimensional structural view of a differential planetary gear shaft hole concentricity testing fixture;

[0015] Figure 2 This utility model provides an overall structural cross-sectional view of a differential planetary gear shaft hole concentricity testing fixture;

[0016] Figure 3 This invention provides a fixture for testing the concentricity of the planetary gear shaft holes in a differential. Figure 2 Enlarged view of the structure of area A in the middle;

[0017] Figure 4 This utility model presents a partial three-dimensional view of a differential planetary gear shaft hole concentricity testing fixture.

[0018] Legend: 1. Working plate; 2. Support leg; 3. Disc; 4. Cross plate; 5. Vertical cavity; 6. Rotating rod; 7. First bevel gear; 8. First motor; 9. Circular hole; 10. Moving column; 11. Limiting groove; 12. Limiting block; 13. Detection head; 14. First screw; 15. Second bevel gear; 16. Extruded rubber block; 17. Gear body; 18. Square block; 19. Cylinder; 20. L-shaped plate; 21. Groove; 22. Moving block; 23. Second screw; 24. L-shaped annular groove; 25. L-shaped annular plate; 26. Gear groove; 27. Rotating gear; 28. Second motor; 29. ​​Third motor; 30. Electric push rod. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Please see Figures 1-4This utility model provides a technical solution: a differential planetary gear shaft hole concentricity testing fixture, comprising: a working plate 1, a disc 3 at the top and near the center of the working plate 1, a cross plate 4 fixedly connected to the top of the disc 3, a vertical cavity 5 at the inside and near the center of the cross plate 4, a rotating rod 6 at the inside and near the center of the vertical cavity 5, a first bevel gear 7 sleeved and fixedly connected to the surface and near the top of the rotating rod 6, and circular holes 9 at all four ends of the cross plate 4, each circular hole 9 having a movable column 10 embedded inside, and the inner end of each movable column 10 being threadedly connected to a first bevel gear 7. The screw 14 and the first screw 14 are both fixedly connected to a second bevel gear 15 at one end, which is located inside the vertical circular cavity 5. The first bevel gear 7 and the second bevel gear 15 are meshed together. The other end of the moving column 10 is fixedly connected to a compression rubber block 16. The gear body 17 is placed on the top of the disc 3. The top of the working plate 1 is fixedly connected to a square block 18 near one end. The top of the square block 18 is embedded in and rotatably connected to a cylinder 19. The top of the cylinder 19 is fixedly connected to an L-shaped plate 20. The bottom inner wall of the L-shaped plate 20 is provided with a groove 21. The inside of the groove 21 is provided with a second screw. The second screw 23 has a moving block 22 threadedly connected to its surface. An electric push rod 30 is fixedly connected to the bottom of each moving block 22. A detection head 13 is fixedly installed at the output end of the electric push rod 30. An L-shaped annular groove 24 is formed on the top of the working plate 1. An L-shaped annular plate 25 is embedded inside each L-shaped annular groove 24. The top of the L-shaped annular plate 25 is fixedly connected to the bottom of the disc 3. A toothed groove 26 is formed on the inner wall of the L-shaped annular plate 25 near its bottom. A rotating gear 27 is meshed inside the toothed groove 26. This arrangement allows the differential gear body 17 to be placed on the disc 3. When the rotating rod 6 rotates, it causes the first bevel gear 7 on it to rotate, which in turn drives the second bevel gear 15 to rotate. The first screw 14 rotates, driving the moving column 10 to move outward or inward along the circular hole 9. The gear body 17 is fixed by squeezing the rubber block 16 from all sides. The rotating gear 27 rotates, which drives the L-shaped ring plate 25 to rotate along the L-shaped ring groove 24. This, in turn, drives the disc 3 and the clamped gear body 17 to rotate. The vertical position of the detection head 13 is adjusted by extending and retracting the electric push rod 30. The rotation of the second screw 23 drives the moving block 22 to move and adjust the horizontal position of the detection head 13.

[0022] like Figure 1 As shown, support legs 2 are fixedly connected to the bottom of the work plate 1 and near the four corners. The bottom of each support leg 2 is trapezoidal. Through the above arrangement, the support legs 2 can support the bottom of the work plate 1.

[0023] like Figure 2As shown, the bottom of the rotating rod 6 is embedded in the inner wall of the bottom of the vertical circular cavity 5 and is rotatably connected to its bearing. The top of the rotating rod 6 passes through the inner wall of the top of the vertical circular cavity 5 and is rotatably connected to its bearing. The top of the cross plate 4 and near the center is fixedly connected to the first motor 8. The output end of the first motor 8 is fixedly connected to the top of the rotating rod 6. With the above arrangement, the first motor 8 can drive the rotating rod 6 to rotate.

[0024] like Figure 3 and Figure 4 As shown, the inner walls of the circular holes 9 are symmetrically provided with limiting grooves 11. Each limiting groove 11 is provided with a limiting block 12 near one end. The limiting blocks 12 are fixedly connected to the surface of the moving column 10. Through the above arrangement, the limiting blocks 12 and the limiting grooves 11 can limit the moving column 10.

[0025] like Figure 2 As shown, one end of the second screw 23 is rotatably connected to the bearing on the inner wall of one end of the groove 21, and the other end of the second screw 23 passes through the inner wall of the other end of the groove 21 and is rotatably connected to its bearing. A third motor 29 is fixedly connected to one side wall of the L-shaped plate 20, and the output end of the third motor 29 is fixedly connected to one end of the second screw 23. With the above arrangement, the third motor 29 can drive the second screw 23 to rotate.

[0026] like Figure 2 As shown, a second motor 28 is fixedly connected to the bottom of the working plate 1. The output end of the second motor 28 passes through the working plate 1 and is fixedly connected to the rotating gear 27. Through the above arrangement, the second motor 28 can drive the rotating gear 27 to rotate.

[0027] The usage and working principle of this device are as follows: Place the differential gear body 17 on the disc 3, start the first motor 8 to drive the rotating rod 6 to rotate, the first bevel gear 7 on the rotating rod 6 meshes with the second bevel gear 15 to rotate, causing the first screw 14 to rotate, driving the moving column 10 to move outward or inward along the circular hole 9 (the limiting groove 11 and the limiting block 12 cooperate to ensure the stability of the movement direction). The extrusion rubber block 16 squeezes the gear body 17 from all sides to achieve fast and stable clamping, simulating the actual installation force state of the differential. During testing, the second motor 28 can be started to drive the rotating gear 27 to rotate. Because the rotating gear 27 meshes with the tooth groove 26 on the inner wall of the L-shaped ring plate 25, it can drive the L-shaped ring plate 25 to rotate along the L-shaped ring groove 24. The movement causes the disc 3 and the clamped gear body 17 to rotate. The electric push rod 30 extends and retracts to adjust the vertical position of the detection head 13. At this time, the third motor 29 is started, which drives the second screw 23 to rotate, causing the moving block 22 to move along the groove 21 and adjust the detection position of the detection head 13 in the horizontal direction. This achieves precise alignment of the detection head 13 with different positions of the planetary gear shaft hole. The detection head 13 contacts the inner wall of the planetary gear shaft hole. After the gear body 17 is clamped stably and the detection position is adjusted, the detection head 13 collects the dimensional data of different positions of the inner wall of the shaft hole. Through the built-in sensing and processing system, the concentricity deviation of the shaft hole is calculated to determine whether it meets the tolerance requirements, thus completing the concentricity detection of the differential planetary gear shaft hole.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A fixture for testing the concentricity of the planetary gear shaft bore in a differential, characterized in that, include: A working plate (1) has a disc (3) at its top and near its center. A cross plate (4) is fixedly connected to the top of the disc (3). A vertical circular cavity (5) is provided inside the cross plate (4) and near its center. A rotating rod (6) is provided inside the vertical circular cavity (5) and near its center. A first bevel gear (7) is fitted and fixedly connected to the surface of the rotating rod (6) and near its top. Circular holes (9) are provided at all four ends of the cross plate (4). Each of the three components has a movable column (10) embedded inside. The inner end of each movable column (10) is embedded and threaded with a first screw (14). One end of the first screw (14) and located inside the vertical circular cavity (5) is fixedly connected with a second bevel gear (15). The first bevel gear (7) meshes with the second bevel gear (15). The other end of each movable column (10) is fixedly connected with a squeeze rubber block (16). A gear body (17) is placed on the top of the disc (3). The working... A square block (18) is fixedly connected to the top of the plate (1) and near one end. A cylinder (19) is embedded in and rotatably connected to the top of each square block (18). An L-shaped plate (20) is fixedly connected to the top of each cylinder (19). A groove (21) is provided on the bottom inner wall of each L-shaped plate (20). A second screw (23) is provided inside the groove (21). A movable block (22) is threaded onto the surface of the second screw (23). The bottom of each movable block (22) is... An electric push rod (30) is fixedly connected, and a detection head (13) is fixedly installed at the output end of the electric push rod (30). An L-shaped annular groove (24) is opened on the top of the working plate (1). An L-shaped annular plate (25) is embedded in the interior of the L-shaped annular groove (24). The top of the L-shaped annular plate (25) is fixedly connected to the bottom of the disc (3). A toothed groove (26) is opened on the inner wall of the L-shaped annular plate (25) near the bottom. A rotating gear (27) is meshed inside the toothed groove (26).

2. The differential planetary gear shaft hole concentricity testing fixture according to claim 1, characterized in that: The bottom of the working plate (1) and near the four corners are all fixedly connected to support legs (2), and the bottom of the support legs (2) is trapezoidal.

3. The differential planetary gear shaft hole concentricity testing fixture according to claim 1, characterized in that: The bottom of the rotating rod (6) is embedded in the bottom inner wall of the vertical circular cavity (5) and rotatably connected to its bearing. The top of the rotating rod (6) penetrates the top inner wall of the vertical circular cavity (5) and rotatably connected to its bearing. The top of the cross plate (4) and near the center is fixedly connected to the first motor (8). The output end of the first motor (8) is fixedly connected to the top of the rotating rod (6).

4. The differential planetary gear shaft hole concentricity testing fixture according to claim 1, characterized in that: The inner walls of the circular holes (9) are symmetrically provided with limiting grooves (11), and each limiting groove (11) is provided with a limiting block (12) inside and near one end. The limiting blocks (12) are fixedly connected to the surface of the moving column (10).

5. A differential planetary gear shaft hole concentricity testing fixture according to claim 1, characterized in that: One end of the second screw (23) is rotatably connected to the bearing on the inner wall of one end of the groove (21), and the other end of the second screw (23) passes through the inner wall of the other end of the groove (21) and is rotatably connected to its bearing. A third motor (29) is fixedly connected to one side wall of the L-shaped plate (20), and the output end of the third motor (29) is fixedly connected to one end of the second screw (23).

6. A differential planetary gear shaft hole concentricity testing fixture according to claim 1, characterized in that: The bottom of the working plate (1) is fixedly connected to a second motor (28), the output end of the second motor (28) passes through the working plate (1) and is fixedly connected to the rotating gear (27).

Images