A gearbox differential surface tooth pattern dressing device

Abstract

The present invention belongs to the technical field of differential surface tooth pattern dressing, and discloses a gearbox differential surface tooth pattern dressing device, comprising a workbench, a fixed seat is rotatably connected to the middle part of the workbench, a fixed block is slidably connected inside the fixed seat, a rack is fixedly connected to the lower end of the fixed block, and a threaded rod is rotatably connected to the lower end of the fixed block. The present invention has the advantage of dressing a bevel gear ring by setting a dressing component, abuts against the tooth groove of the gear ring through a pressure sensor and a limit probe rod, moves along the arc of the tooth groove, so that the grinding wheel can synchronously grind the teeth of the gear ring, can save the cost of manpower grinding, and improve the dressing accuracy, and has the advantage of controlling the rotation angle of the gear ring by setting a limiting component, and the baffle is pushed and flipped by the bevel gear ring to drive the rotating shaft and the extrusion block to rotate, and after the baffle passes over a tooth of the bevel gear ring.

Description

Technical Field

[0001] The invention belongs to the technical field of differential surface tooth pattern finishing, in particular to a gearbox differential surface tooth pattern finishing device. Background Art

[0002] When a car is driving on a curve, the four wheels need to rotate at the same speed. In order to make the rotation speed of the car basically consistent when driving on a curve, an intermediate differential is needed to adjust the speed difference between the front and rear wheels. The differential will produce mechanical wear during use, which will cause a certain deformation of the shape of the internal gears. If not handled in time, the gears will not be able to mesh tightly, causing damage to the gear teeth.

[0003] China Patent Network Publication No.: CN104684685A provides a dressing device and a gear grinding device, which moves at least one of a threaded grinding wheel and a dressing tool along the axial direction of the threaded grinding wheel and the dressing tool at a certain speed and changes the rotation speed of the threaded grinding wheel, or rotates the threaded grinding wheel at a certain speed and changes the movement speed of at least one of the threaded grinding wheel and the dressing tool in the axial direction, thereby performing a dressing process on the threaded grinding wheel with a pressure angle changing along the tooth rib direction without tilting the gear grinding tool axis and the dressing tool. Therefore, there is no need to have a mechanism for tilting the gear grinding tool shaft and the dressing tool, a sensor for measuring the tilt, etc., so the increase in the manufacturing cost of the dressing device can be suppressed. This dressing device can only dress straight-face threaded gears, but cannot dress bevel-face threaded gears, and can only dress smaller gears, but cannot dress larger gears. It has certain limitations, so when dressing the gear ring inside the differential, it can only be done manually by maintenance personnel using a grinder and sandpaper. Therefore, a gearbox differential surface tooth pattern dressing device is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a gearbox differential surface tooth pattern finishing device, which has the advantages of being able to grind the bevel gear ring and automatically adapt to the rotation of the tooth groove.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gearbox differential surface tooth pattern finishing device, comprising a workbench, a fixed seat is rotatably connected to the middle part of the workbench, a fixed block is slidably connected inside the fixed seat, a rack is fixedly connected to the lower end of the fixed block, a threaded rod is rotatably connected to the lower end of the fixed block, a first gear is rotatably connected inside the fixed seat, a second gear is fixedly connected to the bottom of the fixed seat, a limiting component is fixedly connected to the upper part of the workbench, a finishing component is arranged on the top of the workbench, a bevel gear ring is fixedly connected to the top of the fixed seat, and a second motor is fixedly connected to the bottom of the workbench.

[0006] Preferably, the fixing seat is located at the lower side of the trimming assembly, the fixing blocks are distributed in a circular array inside the fixing seat, and the rack is meshedly connected with the first gear.

[0007] Preferably, the threaded rod passes through the fixing seat and extends to the outside of the fixing seat, the threaded rod is threadedly connected to the fixing seat, and the fixing seat pulls the fixing block to move outward to abut against the bevel gear ring to fix the bevel gear ring.

[0008] Preferably, the limiting assembly includes a support rod, a closing button is fixedly connected to the inner wall of the support rod, the upper part of the support rod is rotatably connected to a rotating shaft, the middle part of the rotating shaft is fixedly connected to an extrusion block, the bottom of the extrusion block is fixedly connected to a tension spring, and one end of the extrusion block is rotatably connected to a locking clamping block and a baffle.

[0009] Preferably, the closing button is connected to the switch of the second motor through a power transmission line to turn off the second motor, the lower end of the extrusion block abuts against the closing button, the bottom of the tension spring is fixedly connected to the support rod, the baffle abuts against the bevel gear ring and is located between the teeth of the bevel gear ring, and the locking clamping block passes through the baffle and clamps the locking baffle.

[0010] Preferably, when the bevel gear ring rotates, the teeth of the bevel gear ring will push the baffle to flip, causing it to drive the rotating shaft and the extrusion block to rotate. Then, after the baffle passes over a tooth of the bevel gear ring, the extrusion block is pulled back to its original position by the tension spring, and the second motor is turned off by pressing the closing button through the rotation of the extrusion block to reset.

[0011] Preferably, the dressing assembly includes a sliding seat, a first telescopic rod is fixedly connected to the side of the sliding seat, a turntable is rotatably connected to the bottom of the sliding seat, a second telescopic rod is fixedly connected to the bottom of the turntable, a first motor is fixedly connected to the lower end of the second telescopic rod, a grinding wheel is fixedly connected to the output end of the first motor, a pressure sensor is fixedly connected to the side of the first motor, a limit probe rod is arranged at the bottom of the pressure sensor, and a control module is fixedly connected to the top of the sliding seat.

[0012] Preferably, the sliding seat is slidably connected to a support frame at the upper end of the workbench, the first telescopic rod is fixedly connected to the workbench, the grinding wheel abuts against the bevel gear ring, and the limiting probe rod abuts against the bevel gear ring and is located inside the tooth groove of the bevel gear ring.

[0013] Preferably, the control module controls the opening and closing of the first telescopic rod and the second telescopic rod, and the control module controls the starting of the second motor.

[0014] Preferably, the second motor is used to drive the second gear to rotate, and the fixing seat drives the bevel gear ring to rotate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention has the advantage of trimming the bevel gear ring by setting a trimming component. The pressure sensor and the limit probe rod abut against the tooth groove of the gear ring and move along the arc of the tooth groove, so that the grinding wheel can grind the teeth of the gear ring synchronously, which can save the cost of manual grinding and improve the trimming accuracy.

[0017] The present invention has the advantage of controlling the rotation angle of the gear ring by setting a limiting component. The baffle is pushed and flipped by the bevel gear ring, so that the baffle drives the rotating shaft and the extrusion block to rotate. After the baffle passes over a tooth of the bevel gear ring, the extrusion block is pulled to reset under the tension of the tension spring, and the extrusion block presses the closing button to turn off the second motor to control the rotation angle of the bevel gear ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the fixing seat of the present invention;

[0020] Figure 3 This is a schematic diagram of the explosion structure of the fixing seat of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the limiting component of the present invention;

[0022] Figure 5 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0023] Figure 6 for Figure 5 A partial enlarged schematic diagram in the middle;

[0024] Figure 7 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0025] Figure 8 It is a schematic diagram of the structure of the trimming assembly of the present invention.

[0026] In the figure: 1. workbench; 2. fixed seat; 3. fixed block; 4. rack; 5. threaded rod; 6. first gear; 7. second gear; 8. limiting assembly; 801. support rod; 802. closing button; 803. rotating shaft; 804. extrusion block; 805. tension spring; 806. locking clamping block; 807. baffle; 9. dressing assembly; 901. sliding seat; 902. first telescopic rod; 903. turntable; 904. second telescopic rod; 905. first motor; 906. grinding wheel; 907. pressure sensor; 908. limit probe rod; 909. control module; 10. bevel gear ring; 11. second motor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 8 As shown, the present invention provides a gearbox differential surface tooth pattern finishing device, comprising a workbench 1, a fixed seat 2 is rotatably connected to the middle of the workbench 1, a fixed block 3 is slidably connected inside the fixed seat 2, a rack 4 is fixedly connected to the lower end of the fixed block 3, a threaded rod 5 is rotatably connected to the lower end of the fixed block 3, a first gear 6 is rotatably connected inside the fixed seat 2, a second gear 7 is fixedly connected to the bottom of the fixed seat 2, a limiting component 8 is fixedly connected to the upper part of the workbench 1, a finishing component 9 is arranged on the top of the workbench 1, a bevel gear ring 10 is fixedly connected to the top of the fixed seat 2, and a second motor 11 is fixedly connected to the bottom of the workbench 1;

[0029] First, place the bevel gear ring 10 on the top of the fixing seat 2, and then twist the threaded rod 5 outward so that the threaded rod 5 pulls the fixing block 3 to move outward, and the fixing block 3 is simultaneously moved outward to abut against the bevel gear ring 10 to fix the bevel gear ring 10. At the same time, the bevel gear ring 10 can be positioned in the middle of the fixing seat 2 to avoid the bevel gear ring 10 from being offset and causing damage to the bevel gear ring 10 during trimming. Then, rotate the baffle plate 807 and place it inside the tooth groove of the bevel gear ring 10. Tighten the bolts on the locking clamping block 806 to lock the baffle plate 807. Then, control the grinding wheel 906 to move and fit the tooth groove of the bevel gear ring 10. At the same time, the limit probe rod 908 will also enter the tooth groove of the bevel gear ring 10 and abut against its teeth.

[0030] Then the control module 909 is started to control the grinding wheel 906 to grind and trim the bevel gear ring 10. At the same time, the limit probe rod 908 and the bevel gear ring 10 give the control module 909 an electrical signal through the pressure sensor 907, and then the control module 909 controls the distance pushed by the first telescopic rod 902 and the second telescopic rod 904. At the same time, the grinding wheel 906 can trim and grind the teeth along the trajectory of the limit probe rod 908. After a tooth is ground, the limit probe rod 908 will move out of the tooth groove of the bevel gear ring 10 and lose pressure sensing;

[0031] Then, the control module 909 controls the first telescopic rod 902 and the second telescopic rod 904 to pull the first motor 905 to reset, and at the same time, the control module 909 starts the second motor 11, and the second motor 11 drives the fixing seat 2 to drive the bevel gear ring 10 to rotate. When the bevel gear ring 10 rotates, it will push the baffle 807 to tilt, so that it drives the rotating shaft 803 and the extrusion block 804 to rotate, and after the baffle 807 passes over a tooth of the bevel gear ring 10, it will pull the extrusion block 804 to reset under the tension of the tension spring 805, and the extrusion block 804 presses the closing button 802 to turn off the second motor 11, so as to rotate and remove the tooth groove that has been polished and trimmed by the bevel gear ring 10, and then repeat the above process until the polishing is completed.

[0032] like Figures 2 to 3 As shown, the fixed seat 2 is located at the lower side of the trimming assembly 9, the fixed blocks 3 are distributed in a circular array inside the fixed seat 2, and the rack 4 is meshed with the first gear 6; by setting the fixed seat 2 and the fixed blocks 3, the bevel gear ring 10 can be conveniently fixed, and the bevel gear ring 10 can be positioned in the middle to avoid offset. The design of the rack 4 and the first gear 6 enables the rack 4 to move synchronously with the first gear 6 as the center and the movement direction is the same.

[0033] like Figures 2 to 3 As shown, the threaded rod 5 passes through the fixing seat 2 and extends to the outside of the fixing seat 2. The threaded rod 5 is threadedly connected to the fixing seat 2. The fixing seat 2 pulls the fixing block 3 to move outward to abut against the bevel gear ring 10 to fix the bevel gear ring 10. By setting the threaded rod 5, the fixing block 3 can be easily and quickly pulled outward to fix the bevel gear ring 10.

[0034] like Figures 4 to 7As shown, the limiting component 8 includes a support rod 801, a closing button 802 is fixedly connected to the inner wall of the support rod 801, a rotating shaft 803 is rotatably connected to the upper part of the support rod 801, an extrusion block 804 is fixedly connected to the middle part of the rotating shaft 803, a tension spring 805 is fixedly connected to the bottom of the extrusion block 804, and a locking clamping block 806 and a baffle 807 are rotatably connected to one end of the extrusion block 804; by setting the limiting component 8, the rotation angle of the bevel gear ring 10 can be controlled so that the teeth of the bevel gear ring 10 can be trimmed in sequence, and the outer surface of the baffle 807 is wrapped with a rubber protective layer to avoid bumps and damage to the teeth.

[0035] like Figures 4 to 7 As shown, the closing button 802 is connected to the switch of the second motor 11 through the transmission line to turn off the second motor 11, the lower end of the extrusion block 804 abuts against the closing button 802, the bottom of the tension spring 805 is fixedly connected to the support rod 801, the baffle 807 abuts against the bevel gear ring 10 and is located between the teeth of the bevel gear ring 10, and the locking clamping block 806 penetrates the baffle 807 and clamps the locking baffle 807; the design of the closing button 802 enables it to contact the switch of the second motor 11 through the transmission line. When the closing button 802 is squeezed by the squeezing block 804, the function of closing the second motor 11 can be realized, so that each rotation of the bevel gear ring 10 is a tooth groove angle, and the lower end of the squeezing block 804 is set to abut against the closing button 802, so that the squeezing block 804 can squeeze the closing button 802 to close the second motor 11, thereby controlling the rotation of the bevel gear ring 10, and by locking the baffle 807 with the locking clamping block 806, the position of the baffle 807 can be conveniently adjusted and then fixed.

[0036] like Figures 4 to 7 As shown, when the bevel gear ring 10 rotates, the teeth of the bevel gear ring 10 push the baffle 807 to flip, so that it drives the rotating shaft 803 and the extrusion block 804 to rotate. Then, after the baffle 807 passes over a tooth of the bevel gear ring 10, the extrusion block 804 is pulled back to its original position by the tension spring 805. The extrusion block 804 rotates and resets to press the closing button 802 to turn off the second motor 11. When the bevel gear ring 10 rotates, the teeth of the bevel gear ring 10 push the baffle 807 to flip, The baffle 807 drives the rotating shaft 803 and the extrusion block 804 to rotate with the rotating shaft 803 as the axis. Then, after the baffle 807 passes over a tooth of the bevel gear ring 10, the baffle 807 will lose the thrust generated by the bevel gear ring 10, so that the tension spring 805 can pull the extrusion block 804 to reset. The extrusion block 804 drives the baffle 807 to rotate and reset and re-enter the tooth groove of the bevel gear ring 10. When the extrusion block 804 rotates and resets, it presses the closing button 802 to turn off the second motor 11.

[0037] like Figures 5 to 8As shown, the dressing assembly 9 includes a sliding seat 901, a first telescopic rod 902 is fixedly connected to the side of the sliding seat 901, a turntable 903 is rotatably connected to the bottom of the sliding seat 901, a second telescopic rod 904 is fixedly connected to the bottom of the turntable 903, a first motor 905 is fixedly connected to the lower end of the second telescopic rod 904, a grinding wheel 906 is fixedly connected to the output end of the first motor 905, a pressure sensor 907 is fixedly connected to the side of the first motor 905, a limit position probe 908 is arranged at the bottom of the pressure sensor 907, and the sliding seat 90 A control module 909 is fixedly connected to the top; by setting the trimming assembly 9, the teeth of the bevel gear ring 10 can be polished according to the gear curvature of the bevel gear ring 10, and the second motor 11 can be turned on to push the bevel gear ring 10 to rotate and replace the teeth of the bevel gear ring 10 that need to be polished. The first telescopic rod 902 and the second telescopic rod 904 can cooperate to adjust the position of the first motor 905, and then the turntable 903 adjusts the angle of the first motor 905, and then the grinding wheel 906 is used to grind and trim the bevel gear ring 10.

[0038] like Figures 5 to 8 As shown, the sliding seat 901 is slidably connected to the support frame at the upper end of the workbench 1, the first telescopic rod 902 is fixedly connected to the workbench 1, the grinding wheel 906 is in contact with the bevel gear ring 10, the limit probe rod 908 is in contact with the bevel gear ring 10 and is located inside the tooth groove of the bevel gear ring 10, the control module 909 controls the opening and closing of the first telescopic rod 902 and the second telescopic rod 904, and the control module 909 controls the opening of the second motor 11, and the second motor 11 is used to drive the second gear 7 to rotate, so that the fixed seat 2 drives the bevel gear ring 10 to rotate;

[0039] By setting a limit probe rod 908 to abut against the bevel gear ring 10 and be located inside the tooth groove of the bevel gear ring 10, the grinding wheel 906 can grind the teeth of the bevel gear ring 10 under the guidance of the limit probe rod 908. By setting a control module 909 to control the first telescopic rod 902, the second telescopic rod 904 and the first motor 905, the grinding wheel 906 can be automatically reset to achieve automatic grinding. The second motor 11 is used to drive the second gear 7 to rotate, so that the fixed seat 2 drives the bevel gear ring 10 to rotate, and the tooth groove that needs to be polished is replaced.

[0040] The working principle and usage process of the present invention are as follows: when in use, first place the bevel gear ring 10 on the top of the fixed seat 2, and then twist the threaded rod 5 outward so that the threaded rod 5 pulls the fixed block 3 to move outward, and the fixed block 3 is simultaneously moved outward to abut against the bevel gear ring 10 to fix the bevel gear ring 10. At the same time, the bevel gear ring 10 can be positioned in the middle of the fixed seat 2 to avoid the bevel gear ring 10 from being offset and causing damage to the bevel gear ring 10 during trimming. Then, the baffle 807 is rotated and placed inside the tooth groove of the bevel gear ring 10, and the bolts on the locking clamping block 806 are tightened to lock the baffle 807. Then, the grinding wheel 906 is controlled to move to fit the tooth groove of the bevel gear ring 10. At the same time, the limit probe rod 908 will also enter the tooth groove of the bevel gear ring 10 and abut against its teeth.

[0041] After the preparation is completed, the control module 909 is started, and the control module 909 controls the start of the grinding wheel 906 to grind and trim the bevel gear ring 10. At the same time, the first telescopic rod 902 will push the sliding seat 901 to move, and the second telescopic rod 904 will push the first motor 905 to move downward. The limit probe rod 908 and the bevel gear ring 10, and then the pressure sensor 907 give the control module 909 an electrical signal, and then the control module 909 controls the pushing distance of the first telescopic rod 902 and the second telescopic rod 904. At the same time, the grinding wheel 906 can trim and grind the teeth along the trajectory of the limit probe rod 908. After a tooth is ground, the limit probe rod 908 will move out from the tooth groove of the bevel gear ring 10 and lose pressure sensing.

[0042] Then, the control module 909 controls the first telescopic rod 902 and the second telescopic rod 904 to pull the first motor 905 to reset, and at the same time, the control module 909 starts the second motor 11, and the second motor 11 drives the fixing seat 2 to drive the bevel gear ring 10 to rotate. When the bevel gear ring 10 rotates, it will push the baffle 807 to tilt, so that it drives the rotating shaft 803 and the extrusion block 804 to rotate, and after the baffle 807 passes over a tooth of the bevel gear ring 10, it will pull the extrusion block 804 to reset under the tension of the tension spring 805, and the extrusion block 804 presses the closing button 802 to turn off the second motor 11, so as to rotate and remove the tooth groove that has been polished and trimmed by the bevel gear ring 10, and then repeat the above process until the polishing is completed.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gearbox differential surface tooth pattern finishing device, comprising a workbench (1), characterized in that: The middle part of the workbench (1) is rotatably connected to a fixed seat (2), a fixed block (3) is slidably connected inside the fixed seat (2), a rack (4) is fixedly connected to the lower end of the fixed block (3), a threaded rod (5) is rotatably connected to the lower end of the fixed block (3), a first gear (6) is rotatably connected inside the fixed seat (2), a second gear (7) is fixedly connected to the bottom of the fixed seat (2), a limiting component (8) is fixedly connected to the upper part of the workbench (1), a trimming component (9) is arranged on the top of the workbench (1), a bevel gear ring (10) is fixedly connected to the top of the fixed seat (2), and a second motor (11) is fixedly connected to the bottom of the workbench (1); The limiting assembly (8) comprises a support rod (801), the inner wall of the support rod (801) is fixedly connected to a closing button (802), the upper part of the support rod (801) is rotatably connected to a rotating shaft (803), the middle part of the rotating shaft (803) is fixedly connected to an extrusion block (804), the bottom of the extrusion block (804) is fixedly connected to a tension spring (805), and one end of the extrusion block (804) is rotatably connected to a locking clamping block (806) and a baffle (807); The closing button (802) is connected to the switch of the second motor (11) via a power transmission line to turn off the second motor (11); the lower end of the extrusion block (804) abuts against the closing button (802); the bottom of the tension spring (805) is fixedly connected to the support rod (801); the baffle (807) abuts against the bevel gear ring (10) and is located between the teeth of the bevel gear ring (10); and the locking clamping block (806) penetrates the baffle (807) and clamps the locking baffle (807); The dressing assembly (9) comprises a sliding seat (901), a first telescopic rod (902) being fixedly connected to the side of the sliding seat (901), a rotating disk (903) being rotatably connected to the bottom of the sliding seat (901), a second telescopic rod (904) being fixedly connected to the bottom of the rotating disk (903), a first motor (905) being fixedly connected to the lower end of the second telescopic rod (904), a grinding wheel (906) being fixedly connected to the output end of the first motor (905), a pressure sensor (907) being fixedly connected to the side of the first motor (905), a limit position probe rod (908) being arranged at the bottom of the pressure sensor (907), and a control module (909) being fixedly connected to the top of the sliding seat (901), the limit position probe rod (908) being in contact with the bevel gear ring (10) and being located inside the tooth groove of the bevel gear ring (10).

2. The gearbox differential surface tooth pattern dressing device according to claim 1, characterized in that: The fixing seat (2) is located at the lower side of the trimming assembly (9), the fixing blocks (3) are distributed in a circular array inside the fixing seat (2), and the rack (4) is meshingly connected with the first gear (6).

3. The gearbox differential surface tooth pattern dressing device according to claim 1, characterized in that: The threaded rod (5) passes through the fixing seat (2) and extends to the outside of the fixing seat (2). The threaded rod (5) is threadedly connected to the fixing seat (2). The fixing seat (2) pulls the fixing block (3) to move outward to abut against the bevel gear ring (10) to fix the bevel gear ring (10).

4. The gearbox differential surface tooth pattern dressing device according to claim 1, characterized in that: When the bevel gear ring (10) rotates, the teeth of the bevel gear ring (10) push the baffle (807) to flip, causing the baffle (807) to rotate with the rotating shaft (803) and the extrusion block (804). After the baffle (807) passes over a tooth of the bevel gear ring (10), the tension spring (805) pulls the extrusion block (804) to reset, and the extrusion block (804) rotates to reset and presses the closing button (802) to turn off the second motor (11).

5. The gearbox differential surface tooth pattern dressing device according to claim 4, characterized in that: The sliding seat (901) is slidably connected to a support frame at the upper end of the workbench (1), the first telescopic rod (902) is fixedly connected to the workbench (1), and the grinding wheel (906) is in contact with the bevel gear ring (10).

6. The gearbox differential surface tooth pattern dressing device according to claim 5, characterized in that: The control module (909) controls the opening and closing of the first telescopic rod (902) and the second telescopic rod (904), and the control module (909) controls the turning on of the second motor (11).

7. The gearbox differential surface tooth pattern dressing device according to claim 1, characterized in that: The second motor (11) is used to drive the second gear (7) to rotate, and the fixing seat (2) drives the bevel gear ring (10) to rotate.

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