Gear hobbing machine for machining outer teeth of gear ring

Abstract

The invention relates to the field of gear hobbing machines, and discloses a gear hobbing machine for gear ring outer gear machining, which comprises a shell, a placing table is fixedly mounted at the bottom of the shell, a gear workpiece is placed between a positioning block and the placing table, a gear shaving piece is fixedly mounted in the shell at the side part of the gear workpiece, and the gear shaving piece comprises a first motor fixedly mounted at the side part of the shell; a motor output shaft is fixedly installed at the end of the first motor, a gear shaving cutter is arranged outside the motor output shaft in a sliding mode, a gear shaving fixing rod is arranged at the end of the motor output shaft, the gear shaving cutter is limited by the outside of the gear shaving fixing rod through a bolt, a centering device is arranged on the side of the bolt, and an adjusting device is arranged in the motor output shaft. The sliding rod in the centering device slides in the centering protrusion to drive the centering piece to move, the extending distance of the first rack and the extending distance of the second rack are adjusted, the gear shaving cutter is aligned with the center position of the spline groove of the output shaft of the motor, no gap exists, and errors generated when the gear shaving cutter machines a gear workpiece are reduced.

Description

Technical Field

[0001] This invention relates to the field of gear hobbing machine technology, and more specifically, to a gear hobbing machine for machining the external teeth of a gear ring. Background Technology

[0002] Gear hobbing machines are key equipment in gear machining. Their principle is similar to the precise meshing of a rotating "cutting tool" and a "workpiece," cutting gear teeth through continuous generating motion. They are particularly suitable for high-efficiency, high-precision machining of various cylindrical gears. When the machining object expands from single gears to large-sized ring-shaped workpieces, specialized gear hobbing machines for machining the external teeth of gear rings are developed. These machines have a more robust structure, typically employing a layout where the workpiece is fixed and the cutting tool column moves to handle the large diameter and weight of the gear ring. They can efficiently complete the precision external gear machining of core gear rings in large transmission components such as wind turbine gearboxes and large reducers, making them an indispensable part of manufacturing large equipment.

[0003] A patent application with publication number CN116511613A discloses a vertical gear hobbing machine, including a support frame; a portal frame fixedly connected to the support frame; a rotating shaft rotatably connected to the portal frame; a first mounting plate fixedly connected to the rotating shaft; a second mounting plate fixedly connected to the rear end of the first mounting plate; a sliding assembly connected to the second mounting plate; a sliding rod hinged to the sliding assembly; a drive assembly connected to the front side of an adjusting plate; a drive shaft connected to the drive assembly; gears fixedly connected to the drive shaft; a third mounting plate fixedly connected to the support frame; a moving part rotatably connected to the drive shaft; a connecting part fixedly connected to the moving part; and a connecting part fixedly connected to the adjusting plate. The first and third mounting plates are respectively provided with drive shaft grooves that cooperate with the movement of the drive shaft. By adjusting the positional relationship between the gears and the workpiece, workpieces with different tooth height requirements can be processed without changing gears of different sizes. While the aforementioned device can accommodate machining of different sizes of gears, it may require replacement of the shaving cutter when machining other gears, as the tooth height may exceed the adjustment range. However, when replacing the shaving cutter, there may be a gap between the shaving cutter and the spline mounting block, resulting in errors between the shaving cutter and the gear, which in turn leads to reduced machining accuracy and insufficient precision. Summary of the Invention

[0004] This invention provides a gear hobbing machine for machining external gears of gear rings, solving the technical problem in related technologies where, during the subsequent machining of other gears, the shaving cutter needs to be replaced because its tooth height exceeds the adjustment range. However, when replacing the shaving cutter, there may be a gap between the shaving cutter and the spline mounting block, resulting in errors between the shaving cutter and the gear, which leads to reduced machining accuracy and insufficient precision.

[0005] This invention provides a gear hobbing machine for machining external gears of gear rings, including a housing with an observation door. A positioning block is fixedly installed inside the housing, and a placement platform is fixedly installed at the bottom of the housing. A gear workpiece is placed between the positioning block and the placement platform. A gear shaving component is fixedly installed inside the housing on the side of the gear workpiece. The gear shaving component includes a first motor fixedly installed on the side of the housing, a motor output shaft fixedly installed at the end of the first motor, a gear shaving cutter slidably disposed outside the motor output shaft, a gear shaving fixing rod at the end of the motor output shaft, and a bolt limiting the gear shaving cutter on the outside of the gear shaving fixing rod. A centering device is provided on the side of the bolt, and an adjustment device is provided inside the motor output shaft. The centering device is used for adjusting... The shaving blade is aligned with the outside of the motor output shaft, and the adjusting device is used to lock the shaving blade. The alignment device includes a connecting ring, an alignment protrusion, a first rack, a first gear, an alignment member, an alignment groove, a second rack, and a sliding rod. The connecting ring is rotatably mounted on the side of the bolt outside the shaving fixing rod. The alignment protrusion is fixedly mounted on the side of the connecting ring. The first rack and the second rack are slidably mounted inside the alignment protrusion. The first gear is rotatably mounted at the center of the alignment protrusion. The first rack meshes with the first gear and the second rack in sequence. The alignment member is threadedly connected inside the first gear. The alignment groove is provided on the side of the alignment protrusion. The sliding rod is fixedly mounted on the side of the alignment member and passes through the inside of the alignment groove.

[0006] As a further optimization of the present invention, the centering component includes a first limiting plate slidably installed inside the centering protrusion, a second spring and a third spring fixedly installed on the side of the first limiting plate, the end of the second spring being fixedly connected to the interior of the centering protrusion, and the end of the third spring being provided with a centering rotating column, which is threadedly installed inside the first gear.

[0007] As a further optimization of the present invention, the centering component includes a limiting protrusion fixedly installed on the side of the first limiting plate, a top column and a limiting spring fixedly installed on the side of the limiting protrusion, a fourth gear rotatably installed inside the centering protrusion, and a locking rod slidably installed inside the centering protrusion.

[0008] As a further optimization of the present invention, the adjustment device includes an adjustment box, a pressing plate, a connecting member, a support member, and a locking member. The adjustment box is fixedly installed outside the motor output shaft for limiting the shaving blade. The pressing plate is slidably installed inside the adjustment box. Multiple support members are linearly arrayed inside the adjustment box. The connecting member and the locking member are provided on the side of the adjustment box. The connecting member is connected to the pressing plate for adjusting the height of the pressing plate. The locking member is connected to the support member to accommodate the gap between the shaving blade and the motor output shaft.

[0009] As a further optimization of the present invention, the connecting member includes a first connecting strip slidably mounted on the side of the regulating box, a fourth spring fixedly mounted at the end of the first connecting strip, a second connecting strip fixedly mounted at the end of the fourth spring, an L-shaped rack fixedly mounted at the end of the second connecting strip, a connecting column rotatably mounted inside the regulating box, a limiting connecting plate slidably mounted inside the regulating box, a fifth gear rotatably mounted on the top of the limiting connecting plate, and the fifth gear threadedly connected to the connecting column.

[0010] As a further optimization of the present invention, the support member includes a support plate slidably mounted on a linear array on the side of the regulating box. A first support protrusion is fixedly mounted on the side of the support plate. A support U-shaped block is rotatably mounted on the outside of the first support protrusion. An adjusting ring is rotatably mounted on the end of the support U-shaped block. A support rod is slidably mounted inside the adjusting ring. A support ring is fixedly mounted on the outside of the support rod. A support adjusting rod is rotatably mounted on the outside of the support U-shaped block. A second support protrusion is rotatably mounted on the end of the support adjusting rod. A support block is fixedly mounted on the side of the second support protrusion. The support block is symmetrically arranged with the support plate.

[0011] As a further optimization of the present invention, the locking component includes a first locking post slidably mounted on the side of the adjustment box, a locking spring fixedly mounted at the end of the first locking post, a second locking post fixedly mounted at the end of the locking spring, and the side of the second locking post being connected to the end of the support rod.

[0012] As a further optimization of the present invention, the second spring, the third spring, and the centering rotating column are coaxial, and the elasticity of the third spring is greater than that of the second spring.

[0013] As a further optimization of the present invention, the axis of the locking rod is the same as the axis of the top post and the limiting spring, and the locking rod slides inside the centering protrusion to limit the fourth gear.

[0014] As a further optimization of the present invention, the first connecting strip, the first locking post, and the sliding rod are arranged alternately.

[0015] The beneficial effects of this invention are as follows: The gear hobbing machine for machining external gear rings described in this invention uses a sliding rod inside a centering device that slides within a centering protrusion, causing the centering component to move. This adjusts the distance between the extensions of the first and second racks, aligning the shaving cutter with the center of the spline groove on the motor output shaft. The support component inside the adjusting device compensates for irregularities in the spline protrusion on the motor output shaft and the spline groove on the shaving cutter, ensuring no gaps during the shaving cutter's rotation and reducing errors when machining gear workpieces. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall shape of the device of the present invention; Figure 2 This is a schematic diagram of the overall device installation of the present invention; Figure 3 This is a schematic diagram of the internal structure of the overall device of the present invention; Figure 4 This is a schematic diagram of the connection of the shaving component of the present invention; Figure 5 This is a schematic diagram showing the connection between the centering device and the adjusting device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the regulating device of the present invention; Figure 7 This is a schematic diagram of the internal structure of the support component of the present invention; Figure 8 This is a schematic diagram of the internal structure of the locking component of the present invention; Figure 9 This is a schematic diagram of the internal structure of the centering device of the present invention; Figure 10 This is a schematic diagram of the internal structure of the centering component of the present invention.

[0017] In the picture: 1. Outer shell; 11. Observation door; 12. Positioning block; 13. Gear workpiece; 14. Gear shaving part; 141. First motor; 142. Motor output shaft; 143. Gear shaving cutter; 144. Gear shaving fixing rod; 15. Placement platform; 2. Alignment device; 21. Connecting ring; 22. Alignment protrusion; 23. First rack; 24. First gear; 25. Alignment component; 251. First limiting plate; 252. Limiting protrusion; 253. Top post; 254. Limiting spring; 255. Second spring; 256. Third spring; 257. Alignment rotating post; 258. Locking rod; 259. Fourth gear; 26. Alignment groove; 27. Second rack; 28. Slide rod; 3. Adjustment device; 31. Adjustment box; 32. Extrusion plate; 33. Connecting piece; 331. First connecting bar; 332. Fourth spring; 333. Second connecting bar; 334. L-shaped rack; 335. Connecting column; 336. Fifth gear; 337. Limiting connecting plate; 34. Support piece; 341. Support plate; 342. Support block; 343. Support U-shaped block; 344. First support protrusion; 345. Support rod; 346. Support ring; 347. Support adjusting rod; 348. Second support protrusion; 349. Adjusting ring; 35. Locking piece; 351. First locking post; 352. Locking spring; 353. Second locking post. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1 to 3 As shown in the figure, a gear hobbing machine for machining external gear rings according to an embodiment of the present invention includes a housing 1, an observation door 11 provided on the housing 1, a positioning block 12 fixedly installed inside the housing 1, a placement platform 15 fixedly installed at the bottom of the housing 1, a gear workpiece 13 placed between the positioning block 12 and the placement platform 15, and a gear shaving component 14 fixedly installed inside the housing 1 on the side of the gear workpiece 13. The gear shaving component 14 includes a first motor 141 fixedly installed on the side of the housing 1, and an electric motor 141 fixedly installed at the end of the first motor 141. The motor output shaft 142 has a slidably mounted shaving blade 143 on its exterior. A shaving fixing rod 144 is provided at the end of the motor output shaft 142. The shaving fixing rod 144 is used to limit the shaving blade 143 by bolts. A centering device 2 is provided on the side of the bolts. An adjustment device 3 is provided inside the motor output shaft 142. The centering device 2 is used to center the shaving blade 143 with the exterior of the motor output shaft 142. The adjustment device 3 is used to lock the shaving blade 143. like Figures 4 to 10As shown, the centering device 2 includes a connecting ring 21, a centering protrusion 22, a first rack 23, a first gear 24, a centering component 25, a centering groove 26, a second rack 27, and a sliding rod 28. The connecting ring 21 is rotatably mounted on the side of the external bolt of the shaving fixing rod 144. The centering protrusion 22 is fixedly mounted on the side of the connecting ring 21. The first rack 23 and the second rack 27 are slidably mounted inside the centering protrusion 22. The first gear 24 is rotatably mounted at the center of the centering protrusion 22. The first rack 23 meshes with the first gear 24 and the second rack 27 in sequence. The centering component 25 is threadedly connected inside the first gear 24. The centering groove 26 is provided on the side of the centering protrusion 22. The sliding rod 28 is fixedly mounted on the side of the centering component 25 and passes through the interior of the centering groove 26.

[0020] It should be noted that when the shaving cutter 143 is installed on the motor output shaft 142, a limit spline is generally provided on the outside of the motor output shaft 142 to facilitate the determination of the angle of the shaving cutter 143. The shaving cutter 143 is then fixed by bolts on the outside of the shaving fixing rod 144. However, during this process, the side of the spline on the outside of the motor output shaft 142 that is under stress may experience wear, resulting in a slight tilt of the shaving cutter 143 during installation. To address this issue, a centering device 2 is rotatably mounted on the bolts securing the shaving fixing rod 144, and an adjusting device 3 is provided on the spline on the motor output shaft 142. When the shaving cutter 143 is installed on the outside of the motor output shaft 142, and the shaving fixing rod 144 presses against the motor output shaft 142, and then the bolts are used to tighten the shaving cutter 143, the centering device 2 will press against the spline on the side of the motor output shaft 142, thereby causing the sliding rod 28 to slide... The shaving rod 28 is located inside the centering protrusion 22, and its end is connected to the centering member 25, thereby causing the centering member 25 to slide inside the centering protrusion 22. This causes the first gear 24 to rotate, and the rotation of the first gear 24 causes the first rack 23 and the second rack 27 to extend. The shaving fixing rod 144 is provided with a sliding groove on its outside, which meshes with the connecting ring 21. This keeps the centering protrusion 22 aligned with the protrusion on the outside of the motor output shaft 142. As a result, the spline groove on the shaving cutter 143 corresponds to the spline protrusion on the outside of the motor output shaft 142, thereby reducing the error when the shaving cutter 143 meshes with the motor output shaft 142. Then, the adjusting device 3 contacts the side of the centering protrusion 22, thereby locking the position of the shaving cutter 143 again, preventing damage or protrusion to the spline on the outside of the motor output shaft 142, which could lead to misalignment. This improves the stability of the connection between the shaving cutter 143 and the motor output shaft 142 and reduces the error.

[0021] like Figures 9 to 10As shown, the centering component 25 includes a first limiting plate 251 slidably installed inside the centering protrusion 22. A second spring 255 and a third spring 256 are fixedly installed on the side of the first limiting plate 251. The end of the second spring 255 is fixedly connected to the interior of the centering protrusion 22. The end of the third spring 256 is provided with a centering rotating column 257. The centering rotating column 257 is threadedly installed inside the first gear 24.

[0022] It should be noted that the sliding rod 28 slides through the third spring 256, which drives the centering rotating column 257 to slide inside the centering protrusion 22. The sliding of the centering protrusion 22 drives the first gear 24 to rotate, thereby causing the first rack 23 and the second rack 27 to extend, so that the spline protrusion on the motor output shaft 142 is aligned with the spline groove on the shaving cutter 143, reducing the installation error between the motor output shaft 142 and the shaving cutter 143.

[0023] like Figures 9 to 10 As shown, the centering component 25 includes a limiting protrusion 252 fixedly installed on the side of the first limiting plate 251. A top post 253 and a limiting spring 254 are fixedly installed on the side of the limiting protrusion 252. A fourth gear 259 is rotatably installed inside the centering protrusion 22. A locking rod 258 is slidably installed inside the centering protrusion 22.

[0024] It should be noted that when the first limiting plate 251 slides inside the centering protrusion 22, it can drive the limiting spring 254 and the top column 253 to move closer to the locking rod 258. The fourth gear 259 meshes with the first gear 24. When the first gear 24 rotates, it can drive the fourth gear 259 to rotate. Therefore, when the locking rod 258 presses against the fourth gear 259, it is used to limit the first gear 24, as well as the first rack 23 and the second rack 27.

[0025] like Figures 6 to 9 As shown, the adjustment device 3 includes an adjustment box 31, a pressing plate 32, a connecting member 33, a support member 34, and a locking member 35. The adjustment box 31 is fixedly installed outside the motor output shaft 142 to limit the shaving blade 143. The pressing plate 32 is slidably installed inside the adjustment box 31. Multiple support members 34 are linearly arrayed inside the adjustment box 31. The connecting member 33 and the locking member 35 are provided on the side of the adjustment box 31. The connecting member 33 is connected to the pressing plate 32 and is used to adjust the height of the pressing plate 32. The locking member 35 is connected to the support member 34 to accommodate the gap between the shaving blade 143 and the motor output shaft 142.

[0026] It should be noted that the locking member 35 contacts the centering protrusion 22, causing the support member 34 to extend, thereby locking and re-centering the shaving blade 143, reducing installation errors. The connecting member 33 contacts the side of the centering protrusion 22, causing the pressing plate 32 to press and lock the first gear 24, preventing the support member 34 from loosening when the shaving blade 143 rotates.

[0027] like Figures 3 to 9 As shown, the connector 33 includes a first connecting strip 331 slidably mounted on the side of the regulating box 31. A fourth spring 332 is fixedly mounted at the end of the first connecting strip 331. A second connecting strip 333 is fixedly mounted at the end of the fourth spring 332. An L-shaped rack 334 is fixedly mounted at the end of the second connecting strip 333. A connecting column 335 is rotatably mounted inside the regulating box 31. A limiting connecting plate 337 is slidably mounted inside the regulating box 31. A fifth gear 336 is rotatably mounted on the top of the limiting connecting plate 337. The fifth gear 336 is threadedly connected to the connecting column 335.

[0028] It should be noted that the sliding of the first connecting bar 331 causes the fourth spring 332, the second connecting bar 333, and the L-shaped rack 334 to move closer to the connecting post 335. The L-shaped rack 334 meshes with the fifth gear 336, thereby causing the connecting post 335 to rotate. The rotation of the connecting post 335 causes the limiting connecting plate 337 to descend, thereby squeezing and locking the support member 34.

[0029] like Figures 6 to 8 As shown, the support member 34 includes a support plate 341 linearly arrayed and slidably mounted on the side of the regulating box 31. A first support protrusion 344 is fixedly mounted on the side of the support plate 341. A support U-shaped block 343 is rotatably mounted on the outside of the first support protrusion 344. An adjusting ring 349 is rotatably mounted on the end of the support U-shaped block 343. A support rod 345 is slidably mounted inside the adjusting ring 349. A support ring 346 is fixedly mounted on the outside of the support rod 345. A support adjusting rod 347 is rotatably mounted on the outside of the support U-shaped block 343. A second support protrusion 348 is rotatably mounted on the end of the support adjusting rod 347. A support block 342 is fixedly mounted on the side of the second support protrusion 348. The support block 342 is symmetrically arranged with the support plate 341.

[0030] It should be noted that a torsion spring is provided at the connection between the support adjusting rod 347 and the support U-shaped block 343. Therefore, when the locking member 35 moves closer to the support member 34, the support plate 341 and the support block 342 move away from each other, causing the support block 342 and the support plate 341 to press against the spline groove inside the shaving cutter 143. The connecting member 33 can also lock the support block 342 and the support plate 341, thereby reducing installation errors between the shaving cutters 143. When the centering protrusion 22 separates from the connecting member 33 and the locking member 35, the locking member 35 pulls the support rod 345, the support ring 346, and the adjusting ring 349, causing the support plate 341 and the support block 342 to move closer to the center of the connecting member 33, thus releasing the locking and contact function.

[0031] like Figure 8 As shown, the locking component 35 includes a first locking post 351 slidably mounted on the side of the adjusting box 31, a locking spring 352 fixedly mounted on the end of the first locking post 351, a second locking post 353 fixedly mounted on the end of the locking spring 352, and the side of the second locking post 353 connected to the end of the support rod 345.

[0032] It should be noted that the contact between the first locking pin 351 and the centering protrusion 22 causes the locking spring 352, the second locking pin 353, and the support rod 345 to move away from the centering protrusion 22, thereby opening the support plate 341 and the support block 342 and releasing the support plate 341 and the support block 342 from contacting the shaving blade 143.

[0033] like Figure 10 As shown, the second spring 255, the third spring 256, and the centering rotating column 257 are coaxial, and the elasticity of the third spring 256 is greater than that of the second spring 255.

[0034] It should be noted that the purpose of moving the slide bar 28 is to drive the third spring 256 and the centering rotating column 257 to move. When the slide bar 28 moves, the second spring 255 contracts first, and then the third spring 256 contracts after the centering rotating column 257 moves away from the farthest end of the slide bar 28.

[0035] like Figure 10 As shown, the axis of the locking rod 258 is the same as the axis of the top post 253 and the limiting spring 254. The locking rod 258 slides inside the centering protrusion 22 to limit the fourth gear 259.

[0036] It should be noted that when the top post 253 and the limit spring 254 slide, they can press the locking rod 258, thereby locking the fourth gear 259.

[0037] like Figures 6 to 10 As shown, the first connecting bar 331, the first locking post 351, and the slide bar 28 are arranged in an alternating manner.

[0038] It should be noted that the first connecting bar 331, the first locking post 351, and the slide bar 28 are staggered, so that when the centering protrusion 22 contacts the spline on the shaving cutter 143, it will not contact the first connecting bar 331 and the first locking post 351, thus preventing interference.

[0039] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the embodiments described above, all of which are within the protection scope of the present invention.

Claims

1. A gear hobbing machine for machining the external gears of a gear ring, comprising a housing (1), characterized in that: An observation door (11) is provided on the outer shell (1). A positioning block (12) is fixedly installed inside the outer shell (1). A placement platform (15) is fixedly installed at the bottom of the outer shell (1). A gear workpiece (13) is placed between the positioning block (12) and the placement platform (15). A gear shaving component (14) is fixedly installed inside the outer shell (1) on the side of the gear workpiece (13). The gear shaving component (14) includes a first motor (141) fixedly installed on the side of the outer shell (1). A motor output shaft (142) is fixedly installed at the end of the first motor (141). A shaving blade (143) is slidably mounted on the outside of the output shaft (142). A shaving fixing rod (144) is mounted at the end of the motor output shaft (142). The shaving fixing rod (144) is used to limit the shaving blade (143) by a bolt. A centering device (2) is mounted on the side of the bolt. An adjusting device (3) is mounted inside the motor output shaft (142). The centering device (2) is used to center the shaving blade (143) with the outside of the motor output shaft (142). The adjusting device (3) is used to lock the shaving blade (143). The centering device (2) includes a connecting ring (21), a centering protrusion (22), a first rack (23), a first gear (24), a centering component (25), a centering groove (26), a second rack (27), and a slide rod (28). The connecting ring (21) is rotatably mounted on the side of the external bolt of the shaving rod (144). The centering protrusion (22) is fixedly mounted on the side of the connecting ring (21). The first rack (23) and the second gear are slidably mounted inside the centering protrusion (22). The center of the centering protrusion (22) is rotatably mounted with a first gear (24), the first rack (23) meshes with the first gear (24) and the second rack (27) in sequence, the centering member (25) is internally threaded to the first gear (24), the centering protrusion (22) is provided with a centering groove (26) on the side, and a slide rod (28) is fixedly mounted on the side of the centering member (25), the slide rod (28) passes through the interior of the centering groove (26).

2. The gear hobbing machine for machining external gears of a gear ring according to claim 1, characterized in that: The centering component (25) includes a first limiting plate (251) slidably installed inside the centering protrusion (22). A second spring (255) and a third spring (256) are fixedly installed on the side of the first limiting plate (251). The end of the second spring (255) is fixedly connected to the inside of the centering protrusion (22). The end of the third spring (256) is provided with a centering rotating column (257). The centering rotating column (257) is threadedly installed inside the first gear (24).

3. A gear hobbing machine for machining external gears of a gear ring according to claim 2, characterized in that: The centering component (25) includes a limiting protrusion (252) fixedly installed on the side of the first limiting plate (251). A top post (253) and a limiting spring (254) are fixedly installed on the side of the limiting protrusion (252). A fourth gear (259) is rotatably installed inside the centering protrusion (22). A locking rod (258) is slidably installed inside the centering protrusion (22).

4. A gear hobbing machine for machining external gears of a gear ring according to claim 3, characterized in that: The adjustment device (3) includes an adjustment box (31), an extrusion plate (32), a connector (33), a support (34), and a locking member (35). The adjustment box (31) is fixedly installed outside the motor output shaft (142) to limit the shaving blade (143). The extrusion plate (32) is slidably installed inside the adjustment box (31). Multiple support members (34) are linearly arrayed inside the adjustment box (31). The side of the adjustment box (31) is provided with a connector (33) and a locking member (35). The connector (33) is connected to the extrusion plate (32) to adjust the height of the extrusion plate (32). The locking member (35) is connected to the support member (34) to accommodate the gap between the shaving blade (143) and the motor output shaft (142).

5. A gear hobbing machine for machining external gears of a gear ring according to claim 4, characterized in that: The connector (33) includes a first connecting strip (331) slidably mounted on the side of the regulating box (31), a fourth spring (332) fixedly mounted at the end of the first connecting strip (331), a second connecting strip (333) fixedly mounted at the end of the fourth spring (332), an L-shaped rack (334) fixedly mounted at the end of the second connecting strip (333), a connecting column (335) rotatably mounted inside the regulating box (31), a limiting connecting plate (337) slidably mounted inside the regulating box (31), a fifth gear (336) rotatably mounted on the top of the limiting connecting plate (337), and the fifth gear (336) threadedly connected to the connecting column (335).

6. A gear hobbing machine for machining external gears of a gear ring according to claim 5, characterized in that: The support member (34) includes a support plate (341) slidably mounted on a linear array on the side of the regulating box (31). A first support protrusion (344) is fixedly mounted on the side of the support plate (341). A support U-shaped block (343) is rotatably mounted on the outside of the first support protrusion (344). An adjusting ring (349) is rotatably mounted on the end of the support U-shaped block (343). A support rod (345) is slidably mounted inside the adjusting ring (349). A support ring (346) is fixedly mounted on the outside of the support rod (345). A support adjusting rod (347) is rotatably mounted on the outside of the support U-shaped block (343). A second support protrusion (348) is rotatably mounted on the end of the support adjusting rod (347). A support block (342) is fixedly mounted on the side of the second support protrusion (348). The support block (342) is symmetrically arranged with the support plate (341).

7. A gear hobbing machine for machining external gears of a gear ring according to claim 6, characterized in that: The locking component (35) includes a first locking post (351) slidably mounted on the side of the adjusting box (31), a locking spring (352) fixedly mounted on the end of the first locking post (351), a second locking post (353) fixedly mounted on the end of the locking spring (352), and the side of the second locking post (353) connected to the end of the support rod (345).

8. A gear hobbing machine for machining external gears of a gear ring according to claim 7, characterized in that: The second spring (255), the third spring (256), and the centering rotating column (257) are coaxial, and the elasticity of the third spring (256) is greater than that of the second spring (255).

9. A gear hobbing machine for machining external gears of a gear ring according to claim 8, characterized in that: The axis of the locking rod (258) is the same as the axis of the top post (253) and the limiting spring (254). The locking rod (258) slides inside the centering protrusion (22) to limit the fourth gear (259).

10. A gear hobbing machine for machining external gears of a gear ring according to claim 9, characterized in that: The first connecting bar (331), the first locking post (351), and the slide bar (28) are arranged in an alternating manner.

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