A differential backlash detection mechanism

Abstract

The utility model aims at providing a differential gear backlash detection mechanism. The utility model discloses a first lifting module and second lifting module, the second lifting module sets up in the below of the first lifting module, be provided with tray assembly between the first lifting module with the second lifting module, the tray assembly is provided with the differential gear of measurement, the action end of the first lifting module is provided with open and shut component and drive motor up and down, the output shaft transmission of drive motor is connected with the upper backlash measurement component, the action end of the second lifting module is provided with the lower backlash measurement component, the upper backlash measurement component the lower backlash measurement component is respectively with the upper end, the lower end cooperation of the differential gear of measurement, open and shut component with the left end, the right end cooperation of the differential gear of measurement. The utility model is applied to the technical field of backlash detection.

Description

Technical Field

[0001] This utility model applies to the technical field of tooth backlash detection, and particularly relates to a differential tooth backlash detection mechanism. Background Technology

[0002] With the rapid development of my country's automotive industry, automotive products are being updated and replaced at an increasingly rapid pace, and users' requirements for automobiles are also getting higher and higher. Among them, the differential is one of the key components of automotive transmission. New energy vehicles are more sensitive to backlash than traditional vehicles due to the large instantaneous torque of the motor. Excessive backlash can cause obvious abnormal noises when the vehicle is turning, thereby affecting the overall performance of the vehicle. Its performance directly affects the functionality and comfort of the vehicle when turning.

[0003] Traditional manual inspection using standard thickness feeler gauges is inefficient and reliant on experience, easily leading to rework due to operational errors. Differentials have complex structures requiring disassembly for inspection, increasing labor costs. The traditional feeler gauge method relies on operator experience, with backlash detection errors reaching ±0.1mm, failing to meet the high precision requirements of ±0.03mm for new energy vehicles. Furthermore, in enclosed differentials, disassembly of the housing is necessary, with single-piece inspection taking over 15 minutes, far below the production line's required cycle time of 5 minutes per piece. Repeated disassembly results in low manual efficiency, hindering cost reduction and efficiency improvement. The automated fixture measurement method solves the measurement errors caused by the reliance on operator experience in traditional feeler gauge methods and improves measurement efficiency. For example, Chinese Patent CN109059732B discloses a differential backlash detection mechanism. After fully positioning the differential, upper and lower tensioning sleeves engage and grip the internal teeth of the gears at the upper and lower ends. A spring balancer and a side-push assembly eliminate any vertical or horizontal misalignment of the differential. A rotating testing mechanism then drives the gears to rotate to a certain torque and stops, thus determining the gear backlash. However, this process is complex, the equipment cost is high, and the testing efficiency is low. Therefore, it is necessary to provide a differential backlash detection mechanism that uses a mechanical structure to fix the half-shaft gears and quantify the displacement, automatically completing the differential backlash measurement. This improves measurement efficiency. By rotating the differential gears and using a high-precision displacement sensor, real-time measurement of micron-level deformation can be achieved, improving measurement repeatability and accuracy. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a differential backlash detection mechanism. By fixing the half-shaft gear through a mechanical structure and quantifying the displacement, the backlash of the differential is automatically measured, which is beneficial to improving the measurement efficiency. By rotating the differential gear and cooperating with a high-precision displacement sensor, real-time measurement of micron-level deformation is achieved, thereby improving the measurement repeatability accuracy.

[0005] The technical solution adopted by this utility model is as follows: This utility model includes a first lifting module and a second lifting module. The second lifting module is disposed below the first lifting module. A tray assembly is disposed between the first lifting module and the second lifting module. The tray assembly is provided with a differential to be tested. The actuating end of the first lifting module is provided with an upper and lower opening assembly and a drive motor. The output shaft of the drive motor is connected to an upper backlash measuring assembly. The actuating end of the second lifting module is provided with a lower backlash measuring assembly. The upper backlash measuring assembly and the lower backlash measuring assembly respectively cooperate with the upper end and lower end of the differential to be tested. The upper and lower opening assembly cooperates with the left end and right end of the differential to be tested.

[0006] As can be seen from the above scheme, this application avoids measurement errors caused by the reliance on operator experience in traditional feeler gauge measurement methods through automatic fixture measurement, which is beneficial to improving measurement efficiency. Differential gear backlash is measured simultaneously from both the top and bottom by rotating the differential gears. Combined with a high-precision displacement sensor, real-time measurement of micron-level deformation is achieved, improving measurement repeatability accuracy. The fixture automatically aligns with the differential, and the mechanical structure fixes the half-shaft gears and quantifies the displacement, automatically completing the differential backlash measurement.

[0007] In a preferred embodiment, the tray assembly includes a rotating module, the rotating module having a disk at its actuating end, and the disk having a plurality of fixed trays.

[0008] In a preferred embodiment, a lifting assembly is provided below the tray assembly. The lifting assembly includes a first drive cylinder in the vertical direction. The actuating end of the first drive cylinder is provided with a lifting frame. The lifting frame is provided with a positioning pin. The bottom of the differential under test is provided with a positioning hole that matches the positioning pin. When the first drive cylinder drives the lifting frame to rise, the positioning pin passes through the fixed tray and engages with the positioning hole, and the fixed tray disengages from the fixed tray.

[0009] In a preferred embodiment, the opening and closing assembly includes a second drive cylinder in the lateral direction, the actuating end of the second drive cylinder is provided with a mounting bracket, and the left and right ends of the mounting bracket are symmetrically provided with a third drive cylinder in the vertical direction. The fixed end and the actuating end of the third drive cylinder are symmetrically provided with paddles, and the paddles cooperate with the differential under test.

[0010] In a preferred embodiment, the differential under test includes an upper planetary gear and a lower planetary gear. The upper backlash measurement assembly includes a first displacement sensor and an upper measuring head. The first displacement sensor is connected to the upper measuring head, and the upper measuring head engages with the upper planetary gear. The lower backlash measurement assembly includes a second displacement sensor and a lower measuring head. The second displacement sensor is connected to the lower measuring head, and the lower measuring head engages with the lower planetary gear. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a three-dimensional structural diagram of the tray assembly;

[0013] Figure 3 This is a three-dimensional structural diagram of the lifting assembly;

[0014] Figure 4 This is a three-dimensional structural diagram of the aforementioned opening and closing component;

[0015] Figure 5 This is a three-dimensional structural diagram of the upper tooth gap measuring component;

[0016] Figure 6 This is a three-dimensional structural diagram of the lower tooth backlash measuring component;

[0017] Figure 7 This is a 3D structural diagram of the differential under test. Detailed Implementation

[0018] like Figures 1 to 2 As shown, in this embodiment, the present invention includes a first lifting module 1 and a second lifting module 2. The second lifting module 2 is disposed below the first lifting module 1. A tray assembly 3 is disposed between the first lifting module 1 and the second lifting module 2. The tray assembly 3 is provided with a differential 4 to be tested. The actuating end of the first lifting module 1 is provided with an upper and lower opening assembly 5 and a drive motor 6. The output shaft of the drive motor 6 is connected to an upper backlash measuring assembly 7. The actuating end of the second lifting module 2 is provided with a lower backlash measuring assembly 8. The upper backlash measuring assembly 7 and the lower backlash measuring assembly 8 respectively cooperate with the upper and lower ends of the differential 4 to be tested. The upper and lower opening assembly 5 cooperates with the left and right ends of the differential 4 to be tested.

[0019] The tray assembly 3 is used to support the differential 4 under test. The first lifting module 1 drives the upper backlash measuring assembly 7 to rise and fall, and the second lifting module 2 drives the lower backlash measuring assembly 8 to rise and fall. The upper backlash measuring assembly 7 descends and presses against the differential 4 under test. The upper backlash measuring assembly 7 contacts the upper planetary gear of the differential 4 under test. The lower backlash measuring assembly 8 rises and contacts the lower planetary gear of the differential 4 under test. The drive motor 6 starts to rotate the internal planetary gear and half-shaft gear of the differential 4 under test. At this time, the lower limit value of the backlash is obtained. The upper and lower opening assembly 5 extends into the interior of the differential 4 under test and opens upward until the upper and lower planetary gears of the differential 4 under test are at their maximum. At this time, the upper limit value of the backlash is obtained. The upper limit value minus the lower limit value is used to obtain the backlash value of the differential.

[0020] like Figure 2 As shown, in this embodiment, the tray assembly 3 includes a rotating module 9, the actuating end of which is provided with a disk 10, and the disk 10 is provided with a plurality of fixed trays 11. The fixed trays 11 are used to place the differential 4 under test, and the rotating module 9 drives the disk 10 to rotate, thereby realizing the continuous loading and unloading of the differential 4 under test.

[0021] like Figure 3 As shown, in this embodiment, a lifting assembly 12 is provided below the tray assembly 3. The lifting assembly 12 includes a first driving cylinder 13 in the vertical direction. The actuating end of the first driving cylinder 13 is provided with a lifting frame 14. The lifting frame 14 is provided with a positioning pin 15. The bottom of the differential 4 under test is provided with a positioning hole that matches the positioning pin 15. When the first driving cylinder 13 drives the lifting frame 14 to rise, the positioning pin 15 passes through the fixed tray 11 and engages with the positioning hole, and the fixed tray 11 is disengaged from the fixed tray 11.

[0022] like Figure 4 As shown, in this embodiment, the upper and lower opening component 5 includes a second driving cylinder 16 in the horizontal direction. The actuating end of the second driving cylinder 16 is provided with a mounting bracket 17. The left and right ends of the mounting bracket 17 are symmetrically provided with a third driving cylinder 18 in the vertical direction. The fixed end and the actuating end of the third driving cylinder 18 are symmetrically provided with a paddle 19. The paddle 19 cooperates with the differential 4 under test.

[0023] The second drive cylinder 16 drives the mounting bracket 17 to move laterally, and the third drive cylinder 18 drives the paddle 19 to move up and down. The paddle 19 extends into the interior of the differential under test 4 and pushes the upper and lower planetary gears of the differential under test 4 to their maximum.

[0024] like Figures 5 to 7As shown, in this embodiment, the differential under test 4 includes an upper planetary gear and a lower planetary gear. The upper backlash measurement assembly 7 includes a first displacement sensor 20 and an upper measuring head 21. The first displacement sensor 20 is connected to the upper measuring head 21, and the upper measuring head 21 engages with the upper planetary gear. The lower backlash measurement assembly 8 includes a second displacement sensor 22 and a lower measuring head 23. The second displacement sensor 22 is connected to the lower measuring head 23, and the lower measuring head 23 engages with the lower planetary gear. After the differential under test 4 is pressed down, the upper measuring head 21 contacts the upper planetary gear of the differential under test 4, and the lower measuring head 23 contacts the lower planetary gear of the differential under test 4. The first displacement sensor 20 and the second displacement sensor 22 can respectively measure the values ​​of the upper measuring head 21 and the lower measuring head 23.

[0025] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. A differential backlash detection mechanism, comprising a first lifting module (1) and a second lifting module (2), wherein the second lifting module (2) is disposed below the first lifting module (1), and a tray assembly (3) is disposed between the first lifting module (1) and the second lifting module (2), wherein the tray assembly (3) is provided with a differential (4) to be tested, characterized in that: The first lifting module (1) is provided with an upper and lower opening component (5) and a drive motor (6) at its operating end. The output shaft of the drive motor (6) is connected to an upper backlash measuring component (7). The second lifting module (2) is provided with a lower backlash measuring component (8) at its operating end. The upper backlash measuring component (7) and the lower backlash measuring component (8) are respectively engaged with the upper and lower ends of the differential (4) under test. The upper and lower opening component (5) is engaged with the left and right ends of the differential (4) under test.

2. The differential backlash detection mechanism according to claim 1, characterized in that: The tray assembly (3) includes a rotating module (9), the rotating module (9) has a disc (10) at its actuating end, and the disc (10) has a plurality of fixed trays (11).

3. The differential backlash detection mechanism according to claim 2, characterized in that: A lifting assembly (12) is provided below the tray assembly (3). The lifting assembly (12) includes a first driving cylinder (13) in the vertical direction. The actuating end of the first driving cylinder (13) is provided with a lifting frame (14). The lifting frame (14) is provided with a positioning pin (15). The bottom of the differential (4) under test is provided with a positioning hole that matches the positioning pin (15). When the first driving cylinder (13) drives the lifting frame (14) to rise, the positioning pin (15) passes through the fixed tray (11) and cooperates with the positioning hole, and the fixed tray (11) is disengaged from the fixed tray (11).

4. The differential backlash detection mechanism according to claim 1, characterized in that: The opening and closing assembly (5) includes a second drive cylinder (16) in the horizontal direction. The actuating end of the second drive cylinder (16) is provided with a mounting bracket (17). The left and right ends of the mounting bracket (17) are symmetrically provided with a third drive cylinder (18) in the vertical direction. The fixed end and the actuating end of the third drive cylinder (18) are symmetrically provided with a paddle (19). The paddle (19) cooperates with the differential (4) under test.

5. The differential backlash detection mechanism according to claim 1, characterized in that: The differential under test (4) includes an upper planetary gear and a lower planetary gear. The upper backlash measurement component (7) includes a first displacement sensor (20) and an upper measuring head (21). The first displacement sensor (20) is connected to the upper measuring head (21), and the upper measuring head (21) is engaged with the upper planetary gear. The lower backlash measurement component (8) includes a second displacement sensor (22) and a lower measuring head (23). The second displacement sensor (22) is connected to the lower measuring head (23), and the lower measuring head (23) is engaged with the lower planetary gear.

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