A gearbox

Abstract

The invention relates to a transmission device, in particular to a gearbox in a trenching machine, the gearbox comprising a gearbox housing, a belt input wheel shaft assembly, and an output travel shaft assembly, wherein the belt input shaft on the belt input wheel shaft assembly and the drive shaft on the output travel shaft assembly both extend into the gearbox housing, a transmission gear train is arranged in the gearbox housing, the transmission gear train comprises a reverse gear shaft assembly, a central shaft assembly, a switching shaft assembly, a speed reduction shaft assembly, a cutter disc reverse shaft assembly, and a cutter disc shift shaft assembly, the belt input wheel shaft assembly and the switching shaft assembly are provided with a fork assembly, a cutter disc reversing fork assembly on the cutter disc shift shaft assembly applies an axial force to the fork assembly through a speed lever, thereby changing the conversion of the transmission gear system to gears I, II, III and reverse, and a cutter disc reversing fork group is arranged on the cutter disc shift shaft assembly, wherein an axial force is applied to the fork assembly through a speed lever, thereby changing the forward and reverse directions of the cutter disc.

Description

Technical Field

[0001] The invention relates to a transmission device, in particular to a gearbox in a trencher. Background Art

[0002] In garden management, the planting of seedlings, the irrigation of the land and the arrangement of underground water pipes all require the excavation of a trench of appropriate size on the ground. For this purpose, special trenching machines have appeared in the market. At present, the more representative trenching machines in China include disc trenchers, chain trenchers, spiral trenchers and other models. However, the prior art has the following deficiencies: 1. Most of the existing trenchers have few speed gears, and only set gears for the needs of tilling the field. The speed change is not flexible enough, and it is impossible to complete the needs of trenching and soiling. In addition, due to the small number of gears, the driving speed is slow in places other than tilling the field, such as on the road; 2. Even if a few are provided with multiple gears, these speed change mechanisms are usually provided with multiple transmission shafts, but the rationality of the structure is insufficient. When using reverse gear, the rotating rotary tiller will cause great danger to the operator, or the gear will be automatically adjusted, which poses a certain safety threat to the operator. Summary of the invention

[0003] In order to solve the deficiencies of the above technical solutions, the present invention provides a gearbox.

[0004] The technical solution adopted by the present invention is:

[0005] A gearbox, characterized in that the gearbox comprises a gearbox housing, a belt input wheel shaft assembly, and an output travel shaft assembly, wherein the belt input shaft on the belt input wheel shaft assembly and the drive shaft on the output travel shaft assembly both extend into the gearbox housing, and characterized in that a transmission gear train is arranged in the gearbox housing, and the transmission gear train comprises a reverse gear shaft assembly, a central shaft assembly, a switching shaft assembly, a speed reduction shaft assembly, a cutter disc reverse shaft assembly, and a cutter disc shift shaft assembly, wherein the gears on the belt input shaft are respectively meshed with the gears on the reverse gear shaft assembly and the central shaft assembly, the gears on the reverse gear shaft assembly are also meshed with the gears on the central shaft assembly, the gears on the central shaft assembly are respectively meshed with the gears on the switching shaft assembly and the cutter disc reverse shaft assembly, the gears on the switching shaft assembly are meshed with the gears on the speed reduction shaft assembly, and the gears on the speed reduction shaft assembly then transmit power to the output travel shaft assembly;

[0006] The belt input wheel shaft assembly and the switching shaft assembly are provided with a shift fork assembly, and the shift fork assembly includes a shift fork member arranged on the shift fork shaft, and the shift fork member is clamped on the belt input wheel shaft assembly and the switching shaft assembly, and both ends of the shift fork shaft extend out of the gearbox housing, one end of which is connected to the shift lever, and the other end of the shift fork shaft extends into the gear shift self-locking device, and the gear shift self-locking device is provided with 3 groups of long holes and 3 groups of short holes arranged perpendicular to the 3 groups of long holes, and a shift self-locking steel ball and a shift compression spring are arranged in each group of long holes, and a groove with the same height as the radius of the shift self-locking steel ball is provided on the shift fork shaft, and an axial force is applied to the shift fork assembly through the shift lever to change the conversion of the transmission gear system to gear Ⅰ, gear Ⅱ, gear Ⅲ and reverse gear; the cutter disc shift shaft assembly is provided with a cutter disc reversing fork group, and an axial force is applied to the shift fork assembly through the speed lever to change the forward and reverse direction of the cutter disc.

[0007] Preferably, the shift fork assembly comprises a first and second gear shift fork assembly, a reverse gear shift fork assembly and a third gear shift fork assembly, the first and second gear shift fork assembly comprises a first and second gear shift fork shaft, and a first and second gear shift fork member fixed to the first and second gear shift fork shaft by fastening bolts, the first and second gear shift fork member is locked on the belt input wheel shaft assembly, one end of the first and second gear shift fork shaft is provided with a left groove and a right groove surrounding the outer diameter of the first and second gear shift fork shaft, and the other end of the first and second gear shift fork shaft is provided with a through hole;

[0008] The reverse gear shift fork assembly comprises a reverse gear shift fork shaft and a reverse gear shift fork member fixed to the reverse gear shift fork shaft by fastening bolts, the reverse gear shift fork member is locked on the belt input wheel shaft assembly, one end of the reverse gear shift fork shaft is provided with a left groove, a middle groove and a right groove surrounding the outer diameter of the reverse gear shift fork shaft, and the other end of the reverse gear shift fork shaft is provided with a through hole;

[0009] The III gear shift fork assembly includes a III gear shift fork shaft, and a III gear shift fork member fixed to the III gear shift fork shaft by fastening bolts, the III gear shift fork member is locked on the switching shaft assembly, a left groove and a right groove surrounding the outer diameter of the III gear shift fork shaft are provided on one end of the III gear shift fork shaft, and a through hole is provided on the other end of the III gear shift fork shaft;

[0010] The I and II gear shift fork shafts, the reverse gear shift fork shaft and the III gear shift fork shaft extend into three groups of long holes respectively, and the depths of the left groove, the middle groove and the right groove on the I and II gear shift fork shafts, the reverse gear shift fork shaft and the III gear shift fork shaft are the same as the radius of the gear shift self-locking steel ball.

[0011] Preferably, the shift fork assembly comprises a first gear and reverse gear shift fork assembly, a second gear and third gear shift fork assembly and a fast and slow gear shift fork assembly, the first gear and reverse gear shift fork assembly comprises a first gear and reverse gear shift fork shaft, and a first gear and reverse gear shift fork member fixed to the first gear and reverse gear shift fork shaft by fastening bolts, the first gear and reverse gear shift fork member is locked on the belt input wheel shaft assembly, one end of the first gear and reverse gear shift fork shaft is provided with a left groove, a middle groove and a right groove around the outer diameter of the first gear and reverse gear shift fork shaft, and the other end of the first gear and reverse gear shift fork shaft is provided with a through hole;

[0012] The II and III gear shift fork assembly comprises a II and III gear shift fork drawer, and a II and III gear shift fork member fixed to the II and III gear shift fork drawer by fastening bolts, the II and III gear shift fork member is locked on the belt input wheel shaft assembly, one end of the II and III gear shift fork drawer is provided with a left groove, a middle groove and a right groove surrounding the outer diameter of the reverse gear shift fork shaft, and the other end of the II and III gear shift fork drawer is provided with a through hole;

[0013] The fast and slow gear shift fork assembly includes a fast and slow gear shift fork shaft, and a fast and slow gear shift fork member fixed to the fast and slow gear shift fork shaft by fastening bolts, the fast and slow gear shift fork member is locked on the switching shaft assembly, one end of the fast and slow gear shift fork shaft is provided with a left groove and a right groove surrounding the outer diameter of the fast and slow gear shift fork shaft, and the other end of the fast and slow gear shift fork shaft is provided with a through hole; the I gear and reverse gear shift fork shaft, II gear and III gear shift fork drawers and the fast and slow gear shift fork shaft respectively extend into the three groups of long holes, and the depths of the left groove, the middle groove and the right groove on the reverse gear shift fork shaft, II gear and III gear shift fork drawers and the fast and slow gear shift fork shaft are the same as the radius of the gear shift self-locking steel ball.

[0014] Preferably, when the middle groove is facing the gear-shift self-locking steel ball, the gear-shift self-locking steel ball is embedded in the groove under the pressure of the gear-shift compression spring, and the speed change system is in the neutral position; when the left groove or the right groove is facing the gear-shift self-locking steel ball, the gear-shift self-locking steel ball is embedded in the groove under the pressure of the gear-shift compression spring, and the speed change system is in the I gear, II gear, III gear or reverse gear position; when gear shifting is required, a certain axial force is applied to the I gear and II gear shift fork shaft, the reverse gear shift fork shaft, the III gear shift fork shaft, the I gear and reverse gear shift fork shaft, the II gear and III gear shift fork shaft, or the fast and slow gear shift fork shaft through the gear shift lever to overcome the pressure of the gear shift compression spring and move the gear-shift self-locking steel ball from the left groove or the right groove The gear shift self-locking steel ball is pressed into the groove again, and the speed change system just shifts into another working gear or retreats into neutral. The distance between adjacent grooves ensures that the gears are in full tooth length meshing or completely out of meshing.

[0015] Preferably, the cutter disc shift shaft assembly includes a cutter disc shift shaft, and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole arranged on the cutter disc forward and reverse shaft, and a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole, and a shift sliding gear, and a first groove, a second groove and a third groove with equal spacing are arranged in the axial direction of the inner hole of the shift sliding gear, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball;

[0016] The cutter disc shift assembly also includes left and right cutter disc shift shaft bearings located on both sides of the shift sliding gear, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft;

[0017] The shift sliding gear is divided into a gear portion and a smooth extension portion, and a positioning groove is provided on the smooth extension portion along its outer diameter, and the positioning groove is used to fix the cutter disc reversing fork member on the cutter disc reversing fork assembly, and the cutter disc reversing fork member is fixed to the cutter disc reversing fork shaft by a fastening bolt, and a through hole is provided on one end of the cutter disc reversing fork shaft, and the other end of the cutter disc reversing fork shaft is sleeved by a fixing member;

[0018] or

[0019] The cutter disc shift shaft assembly includes a cutter disc shift shaft, a cutter disc forward and reverse idle gear and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole arranged on the cutter disc shift shaft, a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole, and a shift sliding gear, and a first groove, a second groove and a third groove with equal spacing are arranged in the axial direction of the inner hole of the shift sliding gear, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball;

[0020] The cutter disc shift assembly also includes left and right cutter disc shift shaft bearings located on both sides of the cutter disc forward and reverse idle gear and the shift sliding gear, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft;

[0021] The shift sliding gear is divided into a gear portion and a smooth extension portion, and a positioning groove is provided on the smooth extension portion along its outer diameter, and the positioning groove is used to fix the cutter disc reversing fork member on the cutter disc reversing fork assembly, and the cutter disc reversing fork member is fixed to the cutter disc reversing fork shaft by a fastening bolt, and a through hole is provided on one end of the cutter disc reversing fork shaft, and the other end of the cutter disc reversing fork shaft is ringed by a fixing member.

[0022] Preferably, when the second groove on the inner hole of the shift sliding gear faces the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear is fixed in the neutral position; when the first groove or the third groove on the inner hole of the shift sliding gear faces the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear is fixed in the forward and reverse working gear, thereby preventing the cutter head from automatically engaging and disengaging in the forward and reverse gears. And ensure that the forward and reverse transmission gears are accurately meshed with the full tooth length; when it is necessary to shift gears, a certain axial force is applied to the cutter disc reversing fork shaft through the shift lever, and the cutter disc reversing fork pushes the shift sliding gear to overcome the pressure of the reversing compression spring, and the reversing self-locking steel ball is squeezed out of the first groove or the second groove or the third groove and pushed back into the self-locking hole, and the shift sliding gear can slide over the reversing self-locking steel ball and move axially; when the other groove moves to face the steel ball, the reversing self-locking steel ball is pressed into the groove again, and the speed change system just shifts into the forward and reverse working gear or retreats into neutral.

[0023] Preferably, the belt input wheel shaft assembly further comprises a belt input shaft bearing, a wheel shaft sliding double linkage gear, a wheel shaft reverse gear sliding gear, a gear III and a belt stopper arranged at the end of the belt input shaft, the wheel shaft sliding double linkage gear, the wheel shaft reverse gear sliding gear and the gear III rotate radially along the belt input bearing; the front end of the belt input shaft extends out of the gearbox housing and is connected to the belt pulley;

[0024] The reverse gear shaft assembly comprises a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, on which a reverse gear driving gear and a reverse gear driven gear are arranged, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft;

[0025] The central shaft assembly comprises a central shaft gear of gear III, a central shaft main gear, a central shaft gear of gear II and a central shaft gear of gear I, both ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings, a spacing bushing is provided between the central shaft gear of gear III and the central shaft main gear, and an intermediate bushing is provided between the central shaft gear of gear II and the central shaft gear of gear I, the central shaft is a spline shaft, the central shaft gear of gear II and the central shaft gear of gear I slide axially on the central shaft spline, and are respectively engaged in gear I, gear II and forward / reverse gear; the central shaft gear of gear III and the central shaft main gear slide axially on the central shaft spline, and are respectively engaged in gear III and reverse gear;

[0026] The III gear shift shaft assembly comprises a III gear shift first gear and a III gear shift second gear arranged on the III gear shift shaft, wherein the III gear shift first gear and the III gear shift second gear are double-linked gears, which rotate radially on the III gear shift shaft, and the two ends of the III gear shift shaft are respectively mounted on the inner diameters of the left and right shift shaft bearings;

[0027] The deceleration shaft assembly includes a deceleration shaft I assembly and a deceleration shaft II assembly, wherein the deceleration shaft I assembly includes a first gear of the deceleration shaft I and a second gear of the deceleration shaft I arranged on the deceleration shaft I, wherein the first gear of the deceleration shaft I and the second gear of the deceleration shaft I on the deceleration shaft I are double-linked gears, which rotate radially on the deceleration shaft I, and both ends of the deceleration shaft I are mounted on the inner diameters of the left and right deceleration shaft I bearings, and a spacing bushing is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I, and the first gear of the deceleration shaft I and the second gear of the deceleration shaft I are clamped on the gear portion of the deceleration shaft I;

[0028] The deceleration shaft II assembly includes a first deceleration shaft II gear, a second deceleration shaft II gear, and a third deceleration shaft II gear, which are arranged on the deceleration shaft II. The two ends of the deceleration shaft II are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. An intermediate bushing is respectively arranged between the first deceleration shaft II gear and the second deceleration shaft II gear, and between the second deceleration shaft II gear and the third deceleration shaft II gear. The deceleration shaft II is a spline shaft.

[0029] The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft;

[0030] The output travel shaft assembly comprises two groups of travel shaft assemblies arranged symmetrically, the travel shaft assembly comprises a toothed clutch mechanism mounted on the driving shaft, the toothed clutch mechanism comprises a travel output gear mounted on the driving shaft, a bearing seat housing, an operating rod mounting seat, a movable clutch sleeve, and a travel sprocket, a bearing is arranged in the bearing seat housing, the bearing is mounted on the driving shaft, a return spring is arranged between the bearing and the movable clutch sleeve, and the return spring is located in the inner cavity of the operating rod mounting seat, a manual operating rod is arranged on the operating rod mounting seat, the manual operating rod is hinged with the connecting part of the operating rod mounting seat, and extends into the inner cavity of the operating rod mounting seat and is clamped on the fixing groove, the fixing groove is arranged on one end of the movable clutch sleeve close to the return spring, an outer gear is arranged along the outer diameter of the other end of the movable clutch sleeve, an inner gear sleeve matching the outer gear is arranged on the inner wall of the travel sprocket, an end cover is arranged on the side wall of the travel sprocket away from the movable clutch sleeve, a locating bearing is arranged between the end cover and the travel sprocket, and a sealing gasket is arranged between the end cover and the locating bearing;

[0031] or

[0032] The belt input wheel shaft assembly includes a belt input shaft bearing, a wheel shaft sliding double linkage gear, a wheel shaft reverse gear sliding gear, a gear of gear III, and a belt stopper arranged at the end of the belt input shaft. The wheel shaft sliding double linkage gear, the wheel shaft reverse gear sliding gear and the gear of gear III rotate radially along the belt input bearing; the front end of the belt input shaft extends out of the gearbox housing and is connected to the belt pulley;

[0033] The reverse gear shaft assembly comprises a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, on which a reverse gear driving gear and a reverse gear driven gear are arranged, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft;

[0034] The central shaft assembly comprises a central shaft gear of gear III, a central shaft main gear, a central shaft gear of gear II and a central shaft gear of gear I, both ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings, a spacing bushing is provided between the central shaft gear of gear III and the central shaft main gear, and an intermediate bushing is provided between the central shaft gear of gear II and the central shaft gear of gear I, the central shaft is a spline shaft, the central shaft gear of gear II and the central shaft gear of gear I slide axially on the central shaft spline, and are respectively engaged in gear I, gear II and forward / reverse gear; the central shaft gear of gear III and the central shaft main gear slide axially on the central shaft spline, and are respectively engaged in gear III and reverse gear;

[0035] The III gear shift shaft assembly comprises a III gear shift first gear and a III gear shift second gear arranged on the III gear shift shaft, wherein the III gear shift first gear and the III gear shift second gear are double-linked gears, which rotate radially on the III gear shift shaft, and the two ends of the III gear shift shaft are respectively mounted on the inner diameters of the left and right shift shaft bearings;

[0036] The deceleration shaft assembly includes a deceleration shaft I assembly and a deceleration shaft II assembly, wherein the deceleration shaft I assembly includes a first gear of the deceleration shaft I and a second gear of the deceleration shaft I arranged on the deceleration shaft I, wherein the first gear of the deceleration shaft I and the second gear of the deceleration shaft I on the deceleration shaft I are double-linked gears, which rotate radially on the deceleration shaft I, and both ends of the deceleration shaft I are mounted on the inner diameters of the left and right deceleration shaft I bearings, and a spacing bushing is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I, and the first gear of the deceleration shaft I and the second gear of the deceleration shaft I are clamped on the gear portion of the deceleration shaft I;

[0037] The deceleration shaft II assembly includes a deceleration shaft II intermediate gear and a deceleration shaft II pinion gear arranged on the deceleration shaft II. The two ends of the deceleration shaft II are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. Bushings are respectively arranged between the deceleration shaft II intermediate gear and the deceleration shaft II pinion gear and the left and right deceleration shaft II bearings. The deceleration shaft II is a spline shaft.

[0038] The speed reduction shaft II pinion meshes with the differential gear on the differential, the differential gear drives the planetary wheel carrier, and then the planetary wheels drive the left and right drive shafts;

[0039] The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft;

[0040] The output travel shaft assembly includes two groups of travel shaft assemblies arranged symmetrically, the travel shaft assembly includes a toothed clutch mechanism installed on the drive shaft, the toothed clutch mechanism includes a bearing seat housing and a travel sprocket installed on the drive shaft, a bearing is arranged in the bearing seat housing, the bearing is installed on the drive shaft, shaft seals are fixed on both end surfaces of the bearing seat housing by screws, the shaft seals are used to seal the bearings, the travel sprocket is arranged at the end of the drive wheel, an end cover is fixed on the side wall of the travel sprocket away from one end of the bearing seat housing, a sealing gasket is arranged on the inner side of the end cover, and is fixed to the drive shaft by fixing bolts;

[0041] or

[0042] The belt input pulley assembly includes a belt input shaft bearing, a sliding double gear of gear II and gear III, a sliding gear of gear I and reverse gear, a cutter disc transmission gear, and a belt stopper arranged at the end of the belt input shaft. The sliding double gear of gear II and gear III, the sliding gear of gear I and reverse gear, and the cutter disc transmission gear rotate radially along the belt input bearing; the front end of the belt input shaft extends out of the gearbox housing and is connected to the belt pulley;

[0043] The reverse gear shaft assembly comprises a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, on which a reverse gear driving gear and a reverse gear driven gear are arranged, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft;

[0044] The central shaft assembly includes a central shaft idle gear, a central shaft I gear, a central shaft III gear, a low speed gear and a central shaft II gear arranged on the central shaft, the two ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings, and a spacing bushing is provided between the central shaft I gear and the central shaft III gear;

[0045] The switching shaft assembly is a fast and slow gear switching shaft assembly, and the fast and slow gear switching shaft assembly includes a switching idler gear, a switching large gear and a switching small gear arranged on the fast and slow gear switching shaft, and the switching large gear and the switching small gear are double-linked gears, and the double-linked gear and the switching idler gear rotate radially on the fast and slow gear switching shaft, and the two ends of the fast and slow gear switching shaft are respectively mounted on the inner diameters of the left and right switching shaft bearings;

[0046] The deceleration shaft assembly includes a deceleration pinion and a deceleration gear set on the deceleration shaft, the deceleration pinion and the deceleration gear are double-linked gears, which rotate radially on the deceleration shaft, and the two ends of the deceleration shaft are respectively mounted on the inner diameters of the left and right deceleration shaft bearings, and a spacing bushing is provided between the deceleration pinion and the left deceleration shaft bearing, so that the deceleration pinion and the deceleration gear are clamped on the gear part of the deceleration shaft;

[0047] The gearbox also includes a differential assembly, which includes a differential gear, a left pinion, and a right pinion arranged on a differential shaft. Both ends of the differential shaft are respectively mounted on the inner diameters of left and right differential bearings. The differential gear meshes with the speed reduction pinion and drives the planetary gear set, which in turn drives the left pinion and the right pinion. The left pinion and the right pinion are respectively meshed with the travel output gears on the left and right drive shafts.

[0048] The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft;

[0049] The output travel shaft assembly includes two groups of travel shaft mechanisms arranged symmetrically, and the travel shaft mechanism includes a toothed clutch mechanism installed on the drive shaft, and the toothed clutch mechanism includes a travel output gear, a bearing seat housing and a travel sprocket installed on the drive shaft. A bearing is provided in the bearing seat housing, and the bearing is installed on the drive shaft. Shaft seals are fixed on both end surfaces of the bearing seat housing by screws, and the shaft seals are used to seal the bearings. The travel sprocket is arranged at the end of the drive wheel, and an end cover is fixed on the side wall of the travel sprocket away from one end of the bearing seat housing, and a sealing gasket is provided on the inner side of the end cover, which is fixed to the drive shaft by fixing bolts.

[0050] The transmission route is:

[0051] ① Traveling gears Ⅰ and Ⅱ: pulley→belt input shaft→wheel shaft sliding double gear→center shaft gear Ⅱ or center shaft gear Ⅰ→center shaft main gear→Ⅲ gear switching first gear, Ⅲ gear switching second gear→speed reduction shaft Ⅰ first gear, speed reduction shaft Ⅰ second gear→speed reduction shaft Ⅱ second gear→speed reduction shaft Ⅱ first gear, speed reduction shaft Ⅱ third gear→travel output gear→left and right drive shafts→travel sprocket;

[0052] ② Travel gear III, reverse gear: pulley → belt input shaft → gear III or axle reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft main gear or center shaft gear III → switch to first gear for gear III, switch to second gear for gear III → first gear for speed reduction shaft I, second gear for speed reduction shaft I → second gear for speed reduction shaft II → first gear for speed reduction shaft II, third gear for speed reduction shaft II → travel output gear → left and right driving wheels → travel sprocket;

[0053] ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft → wheel shaft sliding double gear → center shaft first gear → center shaft main gear → reverse first gear, reverse second gear → shift sliding gear → cutter disc shift shaft;

[0054] or

[0055] ① Traveling gears Ⅰ and Ⅱ: pulley→belt input shaft→wheel shaft sliding double gear→center shaft gear Ⅱ or center shaft gear Ⅰ→center shaft main gear→shift first gear in gear Ⅲ, shift second gear in gear Ⅲ→speed reduction shaft Ⅰ first gear, speed reduction shaft Ⅰ second gear→speed reduction shaft intermediate gear→speed reduction shaft Ⅱ small gear→differential large gear→planetary gear→left and right drive shafts→travel sprocket;

[0056] ② Travel gear III, reverse gear: pulley → belt input shaft → gear III or axle reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft main gear or center shaft gear III → switch to first gear for gear III, switch to second gear for gear III → first gear for speed reduction shaft I, second gear for speed reduction shaft I → intermediate gear for speed reduction shaft II → small gear for speed reduction shaft II → large gear for differential → planetary gear → left and right drive shafts → travel sprocket;

[0057] ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft → wheel shaft sliding double gear → center shaft first gear → center shaft main gear → reverse first gear, reverse second gear → shift sliding gear → cutter disc shift shaft;

[0058] or

[0059] ① Travel slow gear Ⅰ and reverse gear: pulley → belt input shaft → Ⅰ and reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft Ⅰ gear → low speed gear → switch idle gear → switch large gear, switch small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket;

[0060] ② Travel slow gear II and III: pulley → belt input shaft → II and III sliding double gears → center shaft III gear or center shaft II gear → low speed gear → switch to neutral gear → switch to large gear, switch to small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket;

[0061] ③ Fast and slow gear shifting position: center shaft → low speed gear → switch to neutral gear → switch to small gear, switch to small gear → reduce speed to large gear;

[0062] ④ Fast travel gear I and reverse gear: pulley → belt input shaft → I and reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft I gear → switching large gear, switching small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket;

[0063] ⑤ Fast travel gear II and III: pulley → belt input shaft → sliding double gears of II and III gears → center shaft III gear or center shaft II gear → center shaft I gear → switching large gear, switching small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket;

[0064] ⑥ Cutter disc output shaft forward and reverse rotation: pulley → belt input shaft → cutter disc transmission gear → center shaft idle gear → reverse first gear, reverse second gear → cutter disc forward and reverse idle gear → shift sliding gear → cutter disc shift shaft.

[0065] Beneficial effects of the present invention: a groove is provided at the front end of the belt input shaft along its outer diameter, and the pulley is placed in the groove to prevent the pulley from slipping and falling out; the present invention forms a speed change system through the cooperation of 9 shaft assemblies to complete travel gear I, II, III and reverse gear, and the travel gear self-locking device can prevent the travel gear from automatically engaging and automatically disengaging, and ensure that the transmission gears of each gear are accurately meshed with the full tooth length; the cutter disc forward and reverse gear self-locking device can prevent the cutter disc forward and reverse gear from automatically engaging and automatically disengaging, and ensure that the forward and reverse transmission gears are accurately meshed with the full tooth length; the transmission mechanism of the present invention adopts three different structures to realize travel gear I, II, III and reverse gear as well as fast and slow gear conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1a , 1b Schematic diagram of the gear groups of embodiments 1 and 2 of the present invention;

[0067] Figure 2a , 2b , 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k, 2l are schematic diagrams of the belt input wheel shaft assembly, the reverse gear shaft assembly, the central shaft assembly, the III gear switching shaft assembly, the speed reduction shaft I assembly, the cutter disc reverse shaft assembly, the cutter disc shift shaft assembly, the cutter disc forward and reverse self-locking mechanism, the reverse gear fork assembly, the I and II gear fork assemblies, the III gear fork assembly, and the cutter disc reversing fork assembly in embodiments 1 and 2 of the present invention, respectively;

[0068] Figure 3 It is a schematic diagram of the speed reduction shaft II assembly of Example 1 of the present invention;

[0069] Figure 4a This is a transmission principle diagram of traveling gears I and II in embodiment 1 of the present invention;

[0070] Figure 4b This is a transmission principle diagram of travel gear III and reverse gear in embodiment 1 of the present invention;

[0071] Figure 4c This is a schematic diagram of the forward and reverse transmission of the output shaft of the cutter head in Example 1 of the present invention;

[0072] Figure 5 It is a schematic diagram of the speed reduction shaft II assembly of Example 2 of the present invention;

[0073] Figure 6a This is a transmission principle diagram of traveling gears I and II in embodiment 2 of the present invention;

[0074] Figure 6b This is a transmission principle diagram of travel gear III and reverse gear in embodiment 2 of the present invention;

[0075] Figure 6c This is a schematic diagram of the forward and reverse transmission of the cutter head output shaft in Embodiment 2 of the present invention;

[0076] Figure 7a , 7b Schematic diagram of the gearbox housing of embodiments 1 and 2 of the present invention;

[0077] Figure 8a , 8b Schematic diagram of a gear group according to Embodiment 3 of the present invention;

[0078] Figure 9a , 9b Embodiment 3 of the present invention is a schematic diagram of a gearbox housing;

[0079] Fig.10a , 10b , 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j, 10k, 10l, 10m are schematic diagrams of the belt input wheel shaft assembly, the reverse gear shaft assembly, the central shaft assembly, the fast and slow gear switching shaft assembly, the speed reduction shaft assembly, the differential assembly, the cutter disc reverse shaft assembly, the cutter disc shift shaft assembly, the cutter disc forward and reverse self-locking mechanism, the reverse gear fork assembly, the I and II gear fork assemblies, the III gear fork assembly, and the cutter disc reversing fork assembly in Example 3 of the present invention, respectively;

[0080] Fig.11a This is a transmission principle diagram of the slow gear travel I gear and reverse gear of embodiment 3 of the present invention;

[0081] Fig.11bThis is a transmission principle diagram of the slow gear II and III gears of embodiment 3 of the present invention;

[0082] Fig.11c This is a schematic diagram of the fast and slow gear shifting transmission of embodiment 3 of the present invention;

[0083] Fig.11d This is a transmission principle diagram of the fast gear travel I gear and reverse gear of the third embodiment of the present invention;

[0084] Fig.11e This is a transmission principle diagram of the travel II and III gears in Example 3 of the present invention;

[0085] Fig.11f This is a schematic diagram of the forward and reverse transmission of the output shaft of the cutter head in Example 3 of the present invention;

[0086] Fig.12 It is a schematic diagram of the gear shift self-locking device of the present invention;

[0087] Fig.13a , 13b , 13c, 13d are schematic diagrams of the output travel shaft assembly of the present invention;

[0088] Fig.14a , 14b , 14c is a schematic diagram of the present invention; DETAILED DESCRIPTION

[0089] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0090] Example 1

[0091] Reference Figure 1a , 1b, 2i, 2j, 2k, 7a, 7b, 12, 14a, the present invention specifically discloses a gearbox, the gearbox includes a gearbox housing 200, a belt input wheel shaft assembly 201, and an output travel shaft assembly 300, the belt input shaft 2010 on the belt input wheel shaft assembly 201 and the drive shaft 303 on the output travel shaft assembly 300 both extend into the gearbox housing 200, a transmission gear train is arranged in the gearbox housing 200, the transmission gear train includes a reverse gear shaft assembly 203, a central shaft assembly 209, a III gear switching shaft assembly 208, a speed reduction shaft I assembly 210, a speed reduction shaft II assembly 213, a cutter disc reverse shaft assembly 204, and a cutter disc shift shaft assembly 202, the gears on the belt input shaft 2010 are respectively connected to the reverse gear shaft assembly 203 The gear on the reverse shaft assembly 203 is also meshed with the gear on the central shaft assembly 209. The gear on the central shaft assembly 209 is respectively meshed with the gears on the III gear switching shaft assembly 208 and the cutter disc reverse shaft assembly 204. The gear on the III gear switching shaft assembly 208 is meshed with the gear on the speed reduction shaft assembly I 210. The gear on the speed reduction shaft assembly I 210 is meshed with the gear on the speed reduction shaft assembly II 213. The gear on the speed reduction shaft assembly II 213 then transmits the power to the output travel shaft assembly.

[0092] The belt input wheel shaft assembly 201 and the gear III switching shaft assembly 208 are provided with a fork assembly, and the fork assembly includes a gear I and gear II fork assembly 207, a reverse gear fork assembly 211 and a gear III fork assembly 212. The gear I and gear II fork assembly 207 includes a gear I and gear II fork shaft 2071, and a gear I and gear II fork member 2070 fixed to the gear I and gear II fork shaft by fastening bolts, and the gear I and gear II fork member 2070 is locked on the belt input wheel shaft assembly 201, and one end of the gear I and gear II fork shaft 2071 is provided with a left groove and a right groove around the outer diameter of the gear I and gear II fork shaft 2071, and the gear I and gear II fork shaft 2071 is provided with a left groove and a right groove. A through hole is provided at the other end; the reverse gear fork assembly 211 includes a reverse gear fork shaft 2111, and a reverse gear fork member 2110 fixed to the reverse gear fork shaft 2111 by fastening bolts, the reverse gear fork member 2110 is locked on the belt input wheel shaft assembly 201, one end of the reverse gear fork shaft 2111 is provided with a left groove, a middle groove and a right groove around the outer diameter of the reverse gear fork shaft 2111, and a through hole is provided on the other end of the reverse gear fork shaft 2111; the III gear fork assembly 212 includes a III gear fork shaft 2121, and a III gear fork member 2120 fixed to the III gear fork shaft 2121 by fastening bolts, the III gear fork member 2120 is locked on the III gear switching shaft assembly 208 On the gear shift fork shaft 2121, one end of the gear shift fork shaft 2121 is provided with a left groove and a right groove surrounding the outer diameter of the gear shift fork shaft 2121, and the other end of the gear shift fork shaft 2121 is provided with a through hole; both ends of the gear shift fork shafts 2071, the reverse gear shift fork shaft 2111 and the gear shift fork shaft 2121 extend out of the gearbox housing 200, and one end thereof is respectively connected to the shift lever, and the other ends of the gear shift fork shafts 2071, the reverse gear shift fork shaft 2111 and the gear shift fork shaft 2121 extend respectively to the three groups of long holes 2060 in the gear shift self-locking device 206, and the gear shift self-locking device 206 is provided with three groups of short holes 2063, and the three groups of short holes 2063 and the three groups of long holes 2060 The three groups of short holes 2063 are respectively vertical, and a gear shift self-locking steel ball 2062 and a gear shift compression spring 2061 are arranged in the three groups of short holes 2063 . The depths of the left groove, the middle groove and the right groove are the same as the radius of the gear shift self-locking steel ball 2062 .

[0093] When the middle groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring 2061, and the speed change system is in the neutral position; when the left groove or the right groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring, and the speed change system is in the I gear, II gear, III gear or reverse gear position; when it is necessary to shift gears, a certain axial force is applied to the I gear and II gear shift fork shaft 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 through the shift lever to overcome the pressure of the compression spring 2061, and the gear shift self-locking steel ball 2062 is squeezed out of the left groove or the right groove or the middle groove and pushed back into the hole, and the I gear and II gear shift fork shaft 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 can slide over the gear shift self-locking steel ball 2062. And it drives the corresponding shift fork parts and shift gears to move axially. When the I and II gear shift fork shafts 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 moves to another groove and aligns with the steel ball, the steel ball is pressed into the groove again, and the speed change system just shifts into another working gear or retreats into neutral. The distance between adjacent grooves ensures that the gears are in full tooth length meshing or completely out of meshing.

[0094] Figure 2g , 2h As shown in 21, the cutter disc shift shaft assembly 202 includes a cutter disc shift shaft 2020, and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft 2020, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole 2023 arranged on the cutter disc forward and reverse shaft 2020, and a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole 2023, and a shift sliding gear 2022, and the inner hole of the shift sliding gear 2022 is axially provided with a first groove, a second groove and a third groove with equal spacing, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball; the cutter disc shift assembly 202 also includes left and right cutter disc shift shaft bearings located on both sides of the shift sliding gear 2022, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft; the shift sliding gear 2022 is divided into a gear portion and a smooth extension portion, and a positioning groove 2021 is provided along its outer diameter on the smooth extension portion, and the positioning groove 2021 is used to fix the cutter disc reversing fork member 2050 on the cutter disc reversing fork assembly 205, and the cutter disc reversing fork member 2050 is fixed to the cutter disc reversing fork shaft 2051 by fastening bolts, and a through hole is provided on one end of the cutter disc reversing fork shaft 2051, and the other end of the cutter disc reversing fork shaft 2051 is ringed by a fixing member.

[0095] When the second groove on the inner hole of the shift sliding gear 2022 is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022 is fixed in the neutral position; when the first groove or the third groove on the inner hole of the shift sliding gear 2022 is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022 is fixed in the forward and reverse working gear, thereby preventing the cutter disc from automatically engaging or disengaging in the forward and reverse gears, and ensuring The forward and reverse transmission gears are accurately meshed with the full tooth length; when gear shifting is required, a certain axial force is applied to the cutter disc reversing fork shaft 2051 through the shift lever, and the cutter disc reversing fork 2050 pushes the shift sliding gear 2022 to overcome the pressure of the reversing compression spring, and the reversing self-locking steel ball is squeezed out of the first groove or the second groove or the third groove and pushed back into the self-locking hole 2023, and the shift sliding gear can slide over the reversing self-locking steel ball and move axially; when the other groove moves to be opposite to the steel ball, the reversing self-locking steel ball is pressed into the groove again, and the speed change system just shifts into the forward / reverse working gear or retreats into neutral.

[0096] Figure 2a , 2b , 2c, 2d, 2e, 2f, 3 and 13a, 13b, the belt input wheel shaft assembly 201 also includes a belt input shaft bearing 2011, a wheel shaft sliding double linkage gear 2012, a wheel shaft reverse gear sliding gear 2013, a gear Ⅲ gear 2014 and a belt stopper 2015 arranged on the belt input shaft 2010, the wheel shaft sliding double linkage gear 2012, the wheel shaft reverse gear sliding gear 2013 and the gear Ⅲ gear 2014 rotate radially along the belt input shaft 2010; the front end of the belt input shaft 2010 extends out of the gearbox housing 200 and is connected to the pulley;

[0097] The reverse gear shaft assembly 203 includes a reverse gear shaft 2030, which is composed of a small diameter portion and a large diameter portion. A reverse gear driving gear 2032 and a reverse gear driven gear 2031 are arranged on the small diameter portion. An inner bushing is arranged between the reverse gear driving gear 2032 and the reverse gear driven gear 2031 and the small diameter portion, and the reverse gear driving gear 2032 is clamped axially by the bushing arranged on the small diameter portion. The reverse gear driving gear 2032 and the reverse gear driven gear 2031 are double gears, which rotate radially on the reverse gear shaft 2030.

[0098] The central shaft assembly 209 comprises a central shaft III gear 2094, a central shaft main gear 2093, a central shaft II gear 2092, and a central shaft I gear 2091, which are arranged on the central shaft 2090. The two ends of the central shaft 2090 are respectively mounted on the inner diameters of the left and right central shaft bearings. A spacing bushing is provided between the central shaft III gear 2094 and the central shaft main gear 2093, and an intermediate bushing is provided between the central shaft II gear 2092 and the central shaft I gear 2091. The central shaft 2090 is a spline shaft. The central shaft II gear 2092 and the central shaft I gear 2091 slide axially on the splines of the central shaft 2090 to engage in I gear, II gear, and forward and reverse gears respectively; the central shaft III gear 2094 and the central shaft main gear 2093 slide axially on the splines of the central shaft 2090 to engage in III gear and reverse gear respectively.

[0099] The III gear shift shaft assembly 208 comprises a III gear shift first gear 2081 and a III gear shift second gear 2082 arranged on the III gear shift shaft 2080. The III gear shift first gear 2090 and the III gear shift second gear 2082 are double-linked gears, which rotate radially on the III gear shift shaft 2082. Both ends of the III gear shift shaft 2082 are respectively mounted on the inner diameters of the left and right shift shaft bearings.

[0100] The deceleration shaft assembly includes a deceleration shaft I assembly 210 and a deceleration shaft II assembly 213. The deceleration shaft I assembly 210 includes a deceleration shaft I first gear 2101 and a deceleration shaft I second gear 2102 arranged on the deceleration shaft I 2100. The deceleration shaft I first gear 2101 and the deceleration shaft I second gear 2102 on the deceleration shaft I 2100 are double-linked gears, which rotate radially on the deceleration shaft I 2100. Both ends of the deceleration shaft I 2100 are mounted on the inner diameters of the left and right deceleration shaft I bearings. A spacing bushing is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I 2100, and the deceleration shaft I first gear 2101 and the deceleration shaft I second gear 2102 are clamped on the gear portion of the deceleration shaft I 2100.

[0101] The deceleration shaft II assembly 213 includes a first deceleration shaft II gear 2130, a second deceleration shaft II gear 2132, and a third deceleration shaft II gear 2133 arranged on the deceleration shaft II 2131. Both ends of the deceleration shaft II 2131 are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. Intermediate bushings are respectively arranged between the first deceleration shaft II gear 2130 and the second deceleration shaft II gear 2132, and between the second deceleration shaft II gear 2132 and the third deceleration shaft II gear 2133. The deceleration shaft II 2131 is a spline shaft.

[0102] The cutter head reversing shaft assembly 204 comprises a reversing first gear 2041 and a reversing second gear 2042 arranged on the reversing shaft 2040. Both ends of the reversing shaft 2040 are respectively mounted on the inner diameters of the left and right reversing shaft bearings. The first reversing gear 2041 and the second reversing gear 2042 are linkage gears, which rotate radially on the reversing shaft 2040. A spacing bushing is provided between the left reversing shaft bearing and the first reversing gear 2041, so that the first reversing gear 2041 and the second reversing gear 2042 are clamped on the gear portion of the reversing shaft 2040.

[0103] The output travel shaft assembly 300 includes two groups of travel shaft assemblies arranged symmetrically, and the travel shaft assembly includes a toothed clutch mechanism installed on the drive shaft 303, and the toothed clutch mechanism includes a travel output gear 301 installed on the drive shaft, a bearing seat shell 304, an operating rod mounting seat 310, a movable clutch sleeve 309, and a travel sprocket 302. A bearing 305 is arranged in the bearing seat shell 304, and the bearing 305 is installed on the drive shaft 303. A return spring 306 is arranged between the bearing 305 and the movable clutch sleeve 309, which is located at the operating rod mounting seat 308. The inner cavity of the operating rod mounting seat 308 is provided with a manual operating rod 310, the manual operating rod 310 is hinged with the connecting part of the operating rod mounting seat 308, and extends into the inner cavity of the operating rod mounting seat 308 and is clamped on the fixing groove 307, the fixing groove 307 is arranged on one end of the movable clutch sleeve 309 close to the return spring 306, the other end of the movable clutch sleeve 309 is provided with an outer gear 312 along its outer diameter, an inner gear sleeve 311 matching the outer gear 312 is arranged on the inner wall of the traveling sprocket 302, an end cover 314 is arranged on the side wall of the traveling sprocket 302 away from the movable clutch sleeve 309, a locating bearing is arranged between the end cover 314 and the traveling sprocket 302, and a sealing gasket 313 is arranged between the end cover 314 and the locating bearing;

[0104] Figure 4a , 4b , as shown in 4c, its transmission path is:

[0105] ① Traveling gears I and II: pulley → belt input shaft 2010 → wheel shaft sliding double gear 2012 → center shaft gear II 2092 or center shaft gear I 2091 → center shaft main gear 2093 → III gear switching first gear 2081, III gear switching second gear 2082 → speed reduction shaft I first gear 2101, speed reduction shaft I second gear 2102 → speed reduction shaft II second gear 2132 → speed reduction shaft II first gear 2133, speed reduction shaft II third gear 2130 → travel output gear 301 → drive shaft 303 → travel sprocket 302;

[0106] ② Traveling gear III, reverse gear: pulley → belt input shaft 2010 → gear III 2014 or axle reverse gear sliding gear 2013 → reverse gear driving gear 2032, reverse gear driven gear 2031 → center shaft main gear 2093 or center shaft gear III 2094 → gear III switching first gear 2081, gear III switching second gear 2082 → speed reduction shaft I first gear 2011, speed reduction shaft I second gear 2012 → speed reduction shaft II second gear 2032 → speed reduction shaft II first gear 2130, speed reduction shaft II third gear 2033 → travel output gear 301 → drive wheel 303 → travel sprocket 303;

[0107] ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft 2010 → wheel shaft sliding double gear 2012 → center shaft I gear 2091 → center shaft main gear 2093 → reverse first gear 2042, reverse second gear 2041 → shift sliding gear 2022 → cutter disc shift shaft 2020;

[0108] Example 2

[0109] Refer to the picture Figure 1a , 1b , 2i, 2j, 2k, 7a, 7b, 12, 14b, as shown, the present invention also discloses a second gearbox mechanism, the gearbox includes a gearbox housing 200, a belt input wheel shaft assembly 201, and an output travel shaft assembly 300, the belt input shaft 2010 on the belt input wheel shaft assembly 201 and the drive shaft 303 on the output travel shaft assembly 300 both extend into the gearbox housing 200, a transmission gear train is arranged in the gearbox housing 200, the transmission gear train includes a reverse gear shaft assembly 203, a central shaft assembly 209, a III gear switching shaft assembly 208, a speed reduction shaft I assembly 210, a speed reduction shaft II assembly 213, a cutter disc reverse shaft assembly 204, and a cutter disc shift shaft assembly 202, the gears on the belt input shaft 2010 are respectively meshed with the gears on the reverse gear shaft assembly 203 and the central shaft assembly 209, the reverse gear shaft assembly 20 The gear on the gear 3 is also meshed with the gear on the central shaft assembly 209, and the gear on the central shaft assembly 209 is respectively meshed with the gears on the III gear switching shaft assembly 208 and the cutter disc reverse shaft assembly 204, and the gear on the III gear switching shaft assembly 208 is meshed with the gear on the speed reduction shaft assembly I 210, and the gear on the speed reduction shaft assembly I 210 is meshed with the gear on the speed reduction shaft assembly II 213, and the gear on the speed reduction shaft assembly II 213 transmits the power to the output travel shaft assembly;

[0110] The belt input wheel shaft assembly 201 and the gear III switching shaft assembly 208 are provided with a fork assembly, and the fork assembly includes a gear I and gear II fork assembly 207, a reverse gear fork assembly 211 and a gear III fork assembly 212. The gear I and gear II fork assembly 207 includes a gear I and gear II fork shaft 2071, and a gear I and gear II fork member 2070 fixed to the gear I and gear II fork shaft by fastening bolts, and the gear I and gear II fork member 2070 is locked on the belt input wheel shaft assembly 201, and one end of the gear I and gear II fork shaft 2071 is provided with a left groove and a right groove around the outer diameter of the gear I and gear II fork shaft 2071, and the gear I and gear II fork shaft 2071 is provided with a left groove and a right groove. A through hole is provided at the other end; the reverse gear fork assembly 211 includes a reverse gear fork shaft 2111, and a reverse gear fork member 2110 fixed to the reverse gear fork shaft 2111 by fastening bolts, the reverse gear fork member 2110 is locked on the belt input wheel shaft assembly 201, one end of the reverse gear fork shaft 2111 is provided with a left groove, a middle groove and a right groove around the outer diameter of the reverse gear fork shaft 2111, and a through hole is provided on the other end of the reverse gear fork shaft 2111; the III gear fork assembly 212 includes a III gear fork shaft 2121, and a III gear fork member 2120 fixed to the III gear fork shaft 2121 by fastening bolts, the III gear fork member 2120 is locked on the III gear switching shaft assembly 208 On the gear shift fork shaft 2121, one end of the gear shift fork shaft 2121 is provided with a left groove and a right groove surrounding the outer diameter of the gear shift fork shaft 2121, and the other end of the gear shift fork shaft 2121 is provided with a through hole; both ends of the gear shift fork shafts 2071, the reverse gear shift fork shaft 2111 and the gear shift fork shaft 2121 extend out of the gearbox housing 200, and one end thereof is respectively connected to the shift lever, and the other ends of the gear shift fork shafts 2071, the reverse gear shift fork shaft 2111 and the gear shift fork shaft 2121 extend respectively to the three groups of long holes 2060 in the gear shift self-locking device 206, and the gear shift self-locking device 206 is provided with three groups of short holes 2063, and the three groups of short holes 2063 and the three groups of long holes 2060 The three groups of short holes 2063 are respectively vertical, and a gear shift self-locking steel ball 2062 and a gear shift compression spring 2061 are arranged in the three groups of short holes 2063 . The depths of the left groove, the middle groove and the right groove are the same as the radius of the gear shift self-locking steel ball 2062 .

[0111] When the middle groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring 2061, and the speed change system is in the neutral position; when the left groove or the right groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring, and the speed change system is in the I gear, II gear, III gear or reverse gear position; when it is necessary to shift gears, a certain axial force is applied to the I gear and II gear shift fork shaft 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 through the shift lever to overcome the pressure of the compression spring 2061, and the gear shift self-locking steel ball 2062 is squeezed out of the left groove or the right groove or the middle groove and pushed back into the hole, and the I gear and II gear shift fork shaft 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 can slide over the gear shift self-locking steel ball 2062. And it drives the corresponding shift fork parts and shift gears to move axially. When the I and II gear shift fork shafts 2071 or the reverse gear shift fork shaft 2111 or the III gear shift fork shaft 2121 moves to another groove and aligns with the steel ball, the steel ball is pressed into the groove again, and the speed change system just shifts into another working gear or retreats into neutral. The distance between adjacent grooves ensures that the gears are in full tooth length meshing or completely out of meshing.

[0112] Figure 2g , 2h As shown in 21, the cutter disc shift shaft assembly 202 includes a cutter disc shift shaft 2020, and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft 2020, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole 2023 arranged on the cutter disc forward and reverse shaft 2020, and a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole 2023, and a shift sliding gear 2022, and the inner hole of the shift sliding gear 2022 is axially provided with a first groove, a second groove and a third groove with equal spacing, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball; the cutter disc shift assembly 202 also includes left and right cutter disc shift shaft bearings located on both sides of the shift sliding gear 2022, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft; the shift sliding gear 2022 is divided into a gear portion and a smooth extension portion, and a positioning groove 2021 is provided along its outer diameter on the smooth extension portion, and the positioning groove 2021 is used to fix the cutter disc reversing fork member 2050 on the cutter disc reversing fork assembly 205, and the cutter disc reversing fork member 2050 is fixed to the cutter disc reversing fork shaft 2051 by fastening bolts, and a through hole is provided on one end of the cutter disc reversing fork shaft 2051, and the other end of the cutter disc reversing fork shaft 2051 is ringed by a fixing member.

[0113] When the second groove on the inner hole of the shift sliding gear 2022 is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022 is fixed in the neutral position; when the first groove or the third groove on the inner hole of the shift sliding gear 2022 is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022 is fixed in the forward and reverse working gear, thereby preventing the cutter disc from automatically engaging or disengaging in the forward and reverse gears, and ensuring The forward and reverse transmission gears are accurately meshed with the full tooth length; when gear shifting is required, a certain axial force is applied to the cutter disc reversing fork shaft 2051 through the shift lever, and the cutter disc reversing fork 2050 pushes the shift sliding gear 2022 to overcome the pressure of the reversing compression spring, and the reversing self-locking steel ball is squeezed out of the first groove or the second groove or the third groove and pushed back into the self-locking hole 2023, and the shift sliding gear can slide over the reversing self-locking steel ball and move axially; when the other groove moves to be opposite to the steel ball, the reversing self-locking steel ball is pressed into the groove again, and the speed change system just shifts into the forward / reverse working gear or retreats into neutral.

[0114] Figure 2a , 2b , 2c, 2d, 2e, 2f, 5 and 13c, the belt input wheel shaft assembly 201 also includes a belt input shaft bearing 2011, a wheel shaft sliding double linkage gear 2012, a wheel shaft reverse gear sliding gear 2013, a gear Ⅲ gear 2014 and a belt stopper 2015 arranged on the belt input shaft 2010, the wheel shaft sliding double linkage gear 2012, the wheel shaft reverse gear sliding gear 2013 and the gear Ⅲ gear 2014 rotate radially along the belt input shaft 2010; the front end of the belt input shaft 2010 extends out of the gearbox housing 200 and is connected to the pulley;

[0115] The reverse gear shaft assembly 203 includes a reverse gear shaft 2030, which is composed of a small diameter portion and a large diameter portion. A reverse gear driving gear 2032 and a reverse gear driven gear 2031 are arranged on the small diameter portion. An inner bushing is arranged between the reverse gear driving gear 2032 and the reverse gear driven gear 2031 and the small diameter portion, and the reverse gear driving gear 2032 is clamped axially by the bushing arranged on the small diameter portion. The reverse gear driving gear 2032 and the reverse gear driven gear 2031 are double gears, which rotate radially on the reverse gear shaft 2030.

[0116] The central shaft assembly 209 comprises a central shaft III gear 2094, a central shaft main gear 2093, a central shaft II gear 2092, and a central shaft I gear 2091, which are arranged on the central shaft 2090. The two ends of the central shaft 2090 are respectively mounted on the inner diameters of the left and right central shaft bearings. A spacing bushing is provided between the central shaft III gear 2094 and the central shaft main gear 2093, and an intermediate bushing is provided between the central shaft II gear 2092 and the central shaft I gear 2091. The central shaft 2090 is a spline shaft. The central shaft II gear 2092 and the central shaft I gear 2091 slide axially on the splines of the central shaft 2090 to engage in I gear, II gear, and forward and reverse gears respectively; the central shaft III gear 2094 and the central shaft main gear 2093 slide axially on the splines of the central shaft 2090 to engage in III gear and reverse gear respectively.

[0117] The III gear shift shaft assembly 208 comprises a III gear shift first gear 2081 and a III gear shift second gear 2082 arranged on the III gear shift shaft 2080. The III gear shift first gear 2090 and the III gear shift second gear 2082 are double-linked gears, which rotate radially on the III gear shift shaft 2082. Both ends of the III gear shift shaft 2082 are respectively mounted on the inner diameters of the left and right shift shaft bearings.

[0118] The deceleration shaft assembly includes a deceleration shaft I assembly 210 and a deceleration shaft II assembly 213. The deceleration shaft I assembly 210 includes a deceleration shaft I first gear 2101 and a deceleration shaft I second gear 2102 arranged on the deceleration shaft I 2100. The deceleration shaft I first gear 2101 and the deceleration shaft I second gear 2102 on the deceleration shaft I 2100 are double-linked gears, which rotate radially on the deceleration shaft I 2100. Both ends of the deceleration shaft I 2100 are mounted on the inner diameters of the left and right deceleration shaft I bearings. A spacing bushing is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I 2100, and the deceleration shaft I first gear 2101 and the deceleration shaft I second gear 2102 are clamped on the gear portion of the deceleration shaft I 2100.

[0119] The deceleration shaft II assembly includes a deceleration shaft II intermediate gear 2131A and a deceleration shaft II pinion 2132A arranged on the deceleration shaft II 2130A. Both ends of the deceleration shaft II 2130A are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. Bushings are respectively arranged between the deceleration shaft II intermediate gear 2131A and the deceleration shaft II pinion 2132A and the left and right deceleration shaft II bearings. The deceleration shaft II 2130A is a spline shaft.

[0120] The speed reduction shaft II pinion 2132A meshes with the differential gear on the differential, and the differential gear drives the planetary gear carrier, and then the planetary gear drives the left and right drive shafts;

[0121] The cutter head reversing shaft assembly 204 comprises a reversing first gear 2041 and a reversing second gear 2042 arranged on the reversing shaft 2040. Both ends of the reversing shaft 2040 are respectively mounted on the inner diameters of the left and right reversing shaft bearings. The first reversing gear 2041 and the second reversing gear 2042 are linkage gears, which rotate radially on the reversing shaft 2040. A spacing bushing is provided between the left reversing shaft bearing and the first reversing gear 2041, so that the first reversing gear 2041 and the second reversing gear 2042 are clamped on the gear portion of the reversing shaft 2040.

[0122] The output walking shaft assembly includes two groups of walking shaft assemblies arranged symmetrically, and the walking shaft assembly 300A includes a toothed clutch mechanism installed on the driving shaft 303A, and the toothed clutch mechanism includes a bearing seat shell 304A and a walking sprocket 302A installed on the driving shaft 303A. A bearing 301A is provided in the bearing seat shell, and the bearing 301A is installed on the driving shaft 303A. Shaft seals are fixed on both end surfaces of the bearing seat shell 304A by screws, and the shaft seals are used to seal the bearings. The walking sprocket 302A is arranged at the end of the driving shaft, and an end cover 305A is fixed on the side wall of the walking sprocket 302A away from one end of the bearing seat shell 304A, and a sealing gasket is provided on the inner side of the end cover 305A, which is fixed to the driving shaft by fixing bolts.

[0123] Figure 6a , 6b , 6c, its transmission path:

[0124] ① Traveling gears I and II: pulley → belt input shaft 2010 → wheel shaft sliding double gear 2012 → center shaft II gear 2092 or center shaft I gear 2091 → center shaft main gear 2093 → III gear switching first gear 2081, III gear switching second gear 2082 → speed reduction shaft I first gear 2101, speed reduction shaft I second gear 2102A → speed reduction shaft II center gear 2131A, speed reduction shaft II pinion 2132A → differential gear → planetary gear → drive shaft 303 → travel sprocket 302;

[0125] ② Travel gear III, reverse gear: pulley → belt input shaft 2010 → gear 2014 of gear III or reverse gear sliding gear 2013 of axle → reverse driving gear 2032, reverse driven gear 2031 → center shaft main gear 2093 or center shaft gear 2094 of gear III → first gear 2081 of gear III, second gear 2082 of gear III → first gear 2011 of speed reduction shaft I, second gear 2012 of speed reduction shaft I → center gear 2131A of speed reduction shaft II, pinion gear 2132A of speed reduction shaft II → large gear of differential → planetary gear → drive shaft 303 → travel sprocket 302;

[0126] ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft 2010 → wheel shaft sliding double gear 2012 → center shaft I gear gear 2091 → center shaft main gear 2093 → reverse first gear 2042, reverse second gear 2041 → shift sliding gear 2022 → cutter disc shift shaft 2020.

[0127] Example 3

[0128] like Figure 8a , 8b , 9a, 9b, 10j, 10k, 10l, 12 and 14c, the present invention also discloses a third gearbox mechanism, the gearbox includes a gearbox housing 200, a belt input wheel shaft assembly 201A, and an output travel shaft assembly 300A, the belt input shaft 2010A on the belt input wheel shaft assembly 201A and the drive shaft 303A on the output travel shaft assembly 300A both extend into the gearbox housing 200, a transmission gear train is arranged in the gearbox housing 200, the transmission gear train includes a reverse gear shaft assembly 203, a central shaft assembly 209A, a fast and slow gear switching shaft assembly 208A, a speed reduction shaft assembly 210B, a differential shaft wheel assembly 213A, a cutter disc reverse shaft assembly 204, a cutter disc shift shaft assembly 202A and an output travel shaft assembly 300A, the gears on the belt input shaft 2010A are respectively connected to the reverse gear shaft assembly 203 and the central shaft assembly The gear on the reverse gear shaft assembly 203 is also meshed with the gear on the central shaft assembly 209A, and the gear on the central shaft assembly 209A is respectively meshed with the gears on the fast and slow gear switching shaft assembly 208A and the cutter disc reverse shaft assembly 204, and the gear on the fast and slow gear switching shaft assembly 208A is meshed with the gear on the speed reduction shaft assembly 210B, and the gear on the speed reduction shaft assembly 210B is meshed with the gear on the differential shaft wheel assembly 213A, and the gear on the differential shaft wheel assembly 213A then transmits the power to the output travel shaft assembly;

[0129] The belt input wheel shaft assembly 201A and the fast and slow gear switching shaft assembly 208A are provided with a fork assembly, and the fork assembly includes a first gear and reverse gear fork assembly 211A, a second gear and third gear fork assembly 207A and a fast and slow gear fork assembly 212A. The first gear and reverse gear fork assembly 211A includes a first gear and reverse gear fork shaft 2111A, and a first gear and reverse gear fork member 2110A fixed to the first gear and reverse gear fork shaft 2111A by fastening bolts, and the first gear and reverse gear fork member 2110A is locked on the belt input wheel shaft assembly 201A, and the first gear and reverse gear fork shaft 2111A is fixed to the first gear and reverse gear fork shaft 2111A by fastening bolts. One end of 2111A is provided with a left groove, a middle groove and a right groove around the outer diameter of the I gear and reverse gear fork shaft 2111A, and the other end of the I gear and reverse gear fork shaft 2111A is provided with a through hole; the II gear and III gear fork assembly 207A includes a II gear and III gear fork drawer 2071A, and a II gear and III gear fork member 2070A fixed to the II gear and III gear fork drawer 2071A by fastening bolts, the II gear and III gear fork member 2070A is locked on the belt input wheel shaft assembly 201A, and one end of the II gear and III gear fork drawer 2071A is provided with a left groove, a middle groove and a right groove around the outer diameter of the reverse gear fork shaft 2071A, and the I gear and reverse gear fork shaft 2071A is provided with a through hole; The second and third gear shift fork drawers 2071A are provided with a through hole at the other end; the fast and slow gear shift fork assembly 212A includes a fast and slow gear shift fork shaft 2121A, and a fast and slow gear shift fork member 2120A fixed to the fast and slow gear shift fork shaft 2121A by fastening bolts, the fast and slow gear shift fork member 2120A is locked on the fast and slow gear switching shaft assembly 208A, one end of the fast and slow gear shift fork shaft 2121A is provided with a left groove and a right groove around the outer diameter of the fast and slow gear shift fork shaft 2121A, and the other end of the fast and slow gear shift fork shaft 2121A is provided with a through hole;

[0130] Both ends of the I gear and reverse gear shift fork shaft 2111A, the II gear and III gear shift fork drawer 2071A, and the fast and slow gear shift fork shaft 2121A extend out of the gearbox housing 200, and one end thereof is respectively connected to the shift lever, and the other ends of the I gear and reverse gear shift fork shaft 2111A, the II gear and III gear shift fork drawer 2071A, and the fast and slow gear shift fork shaft 2121A respectively extend into the three groups of long holes 2060 in the gear shift self-locking device 206, and the gear shift self-locking device 206 is provided with three groups of short holes 2063, which are respectively perpendicular to the three groups of long holes 2060, and the three groups of short holes 2063 are provided with shift self-locking steel balls 2062 and shift compression springs 2061, and the depths of the left groove, the middle groove and the right groove are the same as the radius of the shift self-locking steel ball 2062.

[0131] When the middle groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring 2061, and the speed change system is in the neutral position; when the left groove or the right groove is directly opposite to the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is embedded in the groove under the pressure of the gear shift compression spring 2061, and the speed change system is in the slow gear I gear, II gear, III gear or reverse gear position; or the speed change system is in the fast gear I gear, II gear, III gear or reverse gear position; when it is necessary to shift gears, the gear shift lever is used to shift the I gear and reverse gear fork shaft 2111A or the II gear and III gear fork puller 2071A or the fast and slow gear fork shaft 2121A A certain axial force is applied to overcome the pressure of the compression spring 2061, and the gear shift self-locking steel ball 2062 is squeezed out of the left groove, the right groove or the middle groove and pushed back into the hole, and the I gear and reverse gear shift fork shaft 2111A or the II gear and III gear shift fork pull 2071A or the fast gear shift fork shaft 2121A can slide over the gear shift self-locking steel ball 2062 and drive the corresponding shift fork member and the shift gear to move axially; when the I gear and reverse gear shift fork shaft 2111A or the II gear and III gear shift fork pull 2071A or the fast gear shift fork shaft 2121A moves to another groove and aligns with the gear shift self-locking steel ball 2062, the gear shift self-locking steel ball 2062 is pressed into the groove again, and the speed change system just shifts into another working gear or retreats into neutral, and the distance between adjacent grooves ensures that the gears are in full tooth length meshing or completely out of meshing.

[0132] Fig.10h , 10i As shown in , 10m, the cutter disc shift shaft assembly 202A includes a cutter disc shift shaft 2020A, and a cutter disc forward and reverse idle gear 2023A and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft 2020A, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole 2024A arranged on the cutter disc shift shaft 2020A, and a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole 2024A, and a shift sliding gear 2022A, and a first groove, a second groove and a third groove with equal spacing are arranged in the axial direction of the inner hole of the shift sliding gear 2022A, and the depths of the first groove, the second groove and the third groove are the same as the radius of the reversing self-locking steel ball;

[0133] The cutter disc shift assembly 202A also includes left and right cutter disc shift shaft bearings located on both sides of the cutter disc forward and reverse idle gear 2023A and the shift sliding gear 2022A, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft 2020A; the shift sliding gear 2022A is divided into a gear portion and a smooth extension portion, and a positioning groove 2021A is provided along the outer diameter of the smooth extension portion, and the positioning groove 2021A is used to fix the cutter disc reversing fork member 2050 on the cutter disc reversing fork assembly 205, and the cutter disc reversing fork member 2050 is fixed to the cutter disc reversing fork shaft 2051 by fastening bolts, and a through hole is provided on one end of the cutter disc reversing fork shaft 2051, and the other end of the cutter disc reversing fork shaft 2051 is ringed by a fixing member.

[0134] When the second groove on the inner hole of the shift sliding gear 2022A is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022A is fixed in the neutral position; when the first groove or the third groove on the inner hole of the shift sliding gear 2022A is facing the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear 2022A is fixed in the forward and reverse working gear, thereby preventing the cutter disc from automatically engaging or disengaging in the forward and reverse gears, and ensuring Ensure that the forward and reverse transmission gears are accurately meshed with the full tooth length; when shifting gears is required, a certain axial force is applied to the cutter disc reversing fork shaft 2051 through the shift lever, and the cutter disc reversing fork 2050 pushes the shift sliding gear 2022A to overcome the pressure of the reversing compression spring, and the reversing self-locking steel ball is squeezed out of the first groove or the second groove or the third groove and pushed back into the self-locking hole, and the shift sliding gear 2022A can slide over the reversing self-locking steel ball and move axially; when the other groove moves to be opposite to the steel ball, the reversing self-locking steel ball is pressed into the groove again, and the speed change system just shifts into the forward and reverse working gear or retreats into neutral.

[0135] Fig.10a , 10b , 10c, 10d, 10e, 10f, 10g and 13d, the belt input pulley shaft assembly 201A further comprises a belt input shaft bearing 2011A, a sliding double gear 2012A for gear II and gear III, a sliding gear 2013A for gear I and reverse gear, a cutter disc drive gear 2014A and a belt stopper 2015A arranged at the end of the belt input shaft 2010A, the sliding double gear 2012A for gear II and gear III, the sliding gear 2013A for gear I and reverse gear and the cutter disc drive gear 2014A radially rotate along the belt input shaft 2010A; the front end of the belt input shaft 2010A extends out of the gearbox housing 200 and is connected to the belt pulley;

[0136] The reverse gear shaft assembly 203 includes a reverse gear shaft 2030, which is composed of a small diameter portion and a large diameter portion. A reverse gear driving gear 2032 and a reverse gear driven gear 2031 are arranged on the small diameter portion. An inner bushing is arranged between the reverse gear driving gear 2032 and the reverse gear driven gear 2031 and the small diameter portion, and the reverse gear driving gear 2032 is clamped axially by the bushing arranged on the small diameter portion. The reverse gear driving gear 2032 and the reverse gear driven gear 2031 are double gears, which rotate radially on the reverse gear shaft 2030.

[0137] The central shaft assembly 209A includes a central shaft idle gear 2095A, a central shaft I gear 2094A, a central shaft III gear 2093A, a low speed gear 2092A and a central shaft II gear 2091A, which are arranged on the central shaft 2090A. Both ends of the central shaft 2090A are respectively mounted on the inner diameters of the left and right central shaft bearings. A spacing bushing is arranged between the central shaft I gear 2094A and the central shaft III gear 2093A.

[0138] The speed shift shaft assembly 208A includes a switching idler gear 2083A, a switching large gear 2081A and a switching small gear 2082A arranged on the speed shift shaft 2080A. The switching large gear 2081A and the switching small gear 2082A are double-linked gears. The double-linked gears and the switching idler gear 2083A rotate radially on the speed shift shaft 2080A. The two ends of the speed shift shaft 2080A are respectively mounted on the inner diameters of the left and right switching shaft bearings.

[0139] The deceleration shaft assembly 210B includes a deceleration pinion 2102B and a deceleration gear 2101B arranged on the deceleration shaft 210B. The deceleration pinion 2102B and the deceleration gear 2101B are double-linked gears, which rotate radially on the deceleration shaft 2100B. Both ends of the deceleration shaft 2100B are respectively mounted on the inner diameters of the left and right deceleration shaft bearings. A spacing bushing is provided between the deceleration pinion 2102B and the left deceleration shaft bearing, and the deceleration pinion 2102B and the deceleration gear 2101B are clamped on the gear portion of the deceleration shaft 2100B.

[0140] The gearbox further includes a differential assembly 213B, which includes a differential gear 2132B, a left pinion 2131B, and a right pinion 2133B arranged on a differential shaft 2130B. Both ends of the differential shaft 2130B are respectively mounted on the inner diameters of the left and right differential bearings. The differential gear 2132B meshes with the speed reduction pinion 2102B and drives the planetary gear set, which in turn drives the left pinion 2131B and the right pinion 2133B. The left pinion 2131B and the right pinion 2133B are respectively meshed with the travel output gear 301A on the drive shaft 303A.

[0141] The cutter head reversing shaft assembly 204 comprises a reversing first gear 2042 and a reversing second gear 2041 arranged on the reversing shaft 2040. The two ends of the reversing shaft 2040 are respectively mounted on the inner diameters of the left and right reversing shaft bearings. The first reversing gear 2042 and the second reversing gear 2041 are linkage gears, which rotate radially on the reversing shaft 2040. A spacing bushing is arranged between the left reversing shaft bearing and the first reversing gear 2042, so that the first reversing gear 2042 and the second reversing gear 2041 are clamped on the gear part of the reversing shaft 2040.

[0142] The output travel shaft assembly 300A includes two groups of travel shaft mechanisms symmetrically arranged, the travel shaft mechanism includes a toothed clutch mechanism installed on the drive shaft 303A, the toothed clutch mechanism includes a travel output gear 301A, a bearing seat housing 304A and a travel sprocket 302A installed on the drive shaft 303A, a bearing 305A is arranged in the bearing seat housing 304A, the bearing 305A is installed on the drive shaft 303A, shaft seals are fixed by screws on both end surfaces of the bearing seat housing 304A, and the shaft seals are used to seal the bearings, the travel sprocket 302A is arranged at the end of the drive wheel 303A, an end cover 306A is fixed on the side wall of the travel sprocket 302A away from the end of the bearing seat housing 304A, a sealing gasket is arranged on the inner side of the end cover 306A, and is fixed to the drive shaft by fixing bolts;

[0143] Fig.11a , 11b , 11c, 11d, 11e, 11f, the transmission principle is:

[0144] ① Travel slow gear Ⅰ and reverse gear: pulley → belt input shaft 2010A → Ⅰ and reverse gear sliding gear 2013A → reverse gear driving gear 2032, reverse gear driven gear 2031 → center shaft Ⅰ gear 2094A → low speed gear 2092A → switch idle gear 2083A → switch large gear 2081A, switch small gear 2082A → speed reduction large gear 2101B, speed reduction small gear 2102B → differential large gear 2132B → left small gear 2131B, right small gear 2133B → travel output gear 301A → drive wheel 303A → travel sprocket 302A;

[0145] ② Travel slow gear II and III: pulley → belt input shaft 2010A → II and III sliding double gear 2092A → center shaft III gear 2093A or center shaft II gear 2091A → low speed gear 2092A → switch neutral gear 2083A → switch large gear 2081A, switch small gear 2082A → speed reduction large gear 2101B, speed reduction small gear 2102B → differential large gear 2132B → left small gear 2131B, right small gear 2133B → travel output gear 301A → drive wheel 303A → travel sprocket 302A;

[0146] ③ Fast and slow gear shifting position: center shaft 2090A → low speed gear 2092A → switch to neutral gear 2083A → switch to large gear 2081A, switch to small gear 2082A → speed reduction large gear 2101B;

[0147] ④ Fast travel gear I and reverse gear: pulley → belt input shaft 2010A → I and reverse sliding gear 2010A → reverse driving gear 2032, reverse driven gear 2031 → center shaft I gear 2094A → switching large gear 2081A, switching small gear 2082A → speed reduction large gear 2101B, speed reduction small gear 2102B → differential large gear 2132B → left small gear 2131B, right small gear 2133B → travel output gear 301A → drive wheel 303A → travel sprocket 302A;

[0148] ⑤ Fast travel gear II and III: pulley → belt input shaft 2010A → sliding double gear 2092A for II and III gears → center shaft III gear 2093A or center shaft II gear 2091A → center shaft I gear 2094A → switching large gear 2081A, switching small gear 2082A → speed reduction large gear 2101B, speed reduction small gear 2102B → differential large gear 2132B → left small gear 2131B, right small gear 2133B → travel output gear 301A → drive wheel 303A → travel sprocket 302A;

[0149] ⑥ Cutter disc output shaft forward and reverse rotation: pulley → belt input shaft 2010A → cutter disc drive gear 2014A → center shaft idle gear 2095A → reverse first gear 2042, reverse second gear 2041 → cutter disc forward and reverse idle gear 2023A → shift sliding gear 2022A → cutter disc shift shaft 2020A.

[0150] The present invention provides a groove along the outer diameter of the front end of the belt input shaft, and places the pulley in the groove to prevent the pulley from slipping and falling out; the present invention forms a speed change system through the cooperation of 9 shaft assemblies to complete the travel gear I, II, III and reverse gear, and can prevent the travel gear from automatically engaging and automatically disengaging through the travel gear self-locking device, and ensure that the transmission gears of each gear are accurately meshed with the full tooth length; the cutter disc forward and reverse gear self-locking device can prevent the cutter disc forward and reverse gear from automatically engaging and automatically disengaging, and ensure that the forward and reverse transmission gears are accurately meshed with the full tooth length; the transmission system of the present invention adopts 3 different structures to form a variety of transmission effects, realize the needs of different conditions, and meet the needs of different users.

[0151] The technical solutions disclosed in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the embodiments of the present invention are explained in this article using specific embodiments. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A gearbox, characterized in that: The gearbox comprises a gearbox housing, a belt input wheel shaft assembly, and an output travel shaft assembly, wherein the belt input shaft on the belt input wheel shaft assembly and the drive shaft on the output travel shaft assembly both extend into the gearbox housing, and is characterized in that a transmission gear train is arranged in the gearbox housing, and the transmission gear train comprises a reverse gear shaft assembly, a central shaft assembly, a switching shaft assembly, a speed reduction shaft assembly, a cutter disc reverse shaft assembly, and a cutter disc shift shaft assembly, wherein the gears on the belt input shaft are respectively meshed with the gears on the reverse gear shaft assembly and the central shaft assembly, the gears on the reverse gear shaft assembly are also meshed with the gears on the central shaft assembly, the gears on the central shaft assembly are respectively meshed with the gears on the switching shaft assembly and the cutter disc reverse shaft assembly, the gears on the switching shaft assembly are meshed with the gears on the speed reduction shaft assembly, and the gears on the speed reduction shaft assembly then transmit power to the output travel shaft assembly; The belt input wheel shaft assembly and the switching shaft assembly are provided with a shift fork assembly, and the shift fork assembly includes a shift fork member arranged on the shift fork shaft, and the shift fork member is clamped on the belt input wheel shaft assembly and the switching shaft assembly, and both ends of the shift fork shaft extend out of the gearbox housing, one end of which is connected to the shift lever, and the other end of the shift fork shaft extends into the gear shift self-locking device, and the gear shift self-locking device is provided with 3 groups of long holes and 3 groups of short holes arranged perpendicular to the 3 groups of long holes, and a shift self-locking steel ball and a shift compression spring are arranged in each group of long holes, and a groove with the same height as the radius of the shift self-locking steel ball is provided on the shift fork shaft, and an axial force is applied to the shift fork assembly through the shift lever to change the conversion of the transmission gear system to the I gear, II gear, III gear and reverse gear; the cutter disc shift shaft assembly is provided with a cutter disc reversing fork group, and an axial force is applied to the shift fork assembly through the speed lever to change the forward and reverse direction of the cutter disc; The shift fork assembly includes a first gear and a second gear shift fork assembly, a reverse gear shift fork assembly and a third gear shift fork assembly, the first gear and the second gear shift fork assembly includes a first gear and a second gear shift fork shaft, and a first gear and a second gear shift fork member fixed to the first gear and the second gear shift fork shaft by fastening bolts, the first gear and the second gear shift fork member is locked on the belt input wheel shaft assembly, one end of the first gear and the second gear shift fork shaft is provided with a left groove and a right groove surrounding the outer diameter of the first gear and the second gear shift fork shaft, and the other end of the first gear and the second gear shift fork shaft is provided with a through hole; The cutter disc shift shaft assembly includes a cutter disc shift shaft, and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole arranged on the cutter disc forward and reverse gear shaft, and a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole, and a shift sliding gear, and a first groove, a second groove and a third groove with equal spacing are arranged in the axial direction of the inner hole of the shift sliding gear, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball; When the second groove on the inner hole of the shift sliding gear faces the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear is fixed in the neutral position.

2. The gearbox according to claim 1, characterized in that: The reverse gear shift fork assembly comprises a reverse gear shift fork shaft and a reverse gear shift fork member fixed to the reverse gear shift fork shaft by fastening bolts, the reverse gear shift fork member is locked on the belt input wheel shaft assembly, one end of the reverse gear shift fork shaft is provided with a left groove, a middle groove and a right groove surrounding the outer diameter of the reverse gear shift fork shaft, and the other end of the reverse gear shift fork shaft is provided with a through hole; The III gear shift fork assembly includes a III gear shift fork shaft, and a III gear shift fork member fixed to the III gear shift fork shaft by a fastening bolt, the III gear shift fork member is locked on the switching shaft assembly, a left groove and a right groove surrounding the outer diameter of the III gear shift fork shaft are provided on one end of the III gear shift fork shaft, and a through hole is provided on the other end of the III gear shift fork shaft; The I and II gear shift fork shafts, the reverse gear shift fork shaft and the III gear shift fork shaft respectively extend into three groups of long holes, and the depths of the left groove, the middle groove and the right groove on the I and II gear shift fork shafts, the reverse gear shift fork shaft and the III gear shift fork shaft are the same as the radius of the gear shift self-locking steel ball.

3. The gearbox according to claim 1, characterized in that: The shift fork assembly comprises a first gear and reverse gear shift fork assembly, a second gear and third gear shift fork assembly and a fast and slow gear shift fork assembly, the first gear and reverse gear shift fork assembly comprises a first gear and reverse gear shift fork shaft, and a first gear and reverse gear shift fork member fixed to the first gear and reverse gear shift fork shaft by fastening bolts, the first gear and reverse gear shift fork member is locked on the belt input wheel shaft assembly, one end of the first gear and reverse gear shift fork shaft is provided with a left groove, a middle groove and a right groove around the outer diameter of the first gear and reverse gear shift fork shaft, and the other end of the first gear and reverse gear shift fork shaft is provided with a through hole; The II and III gear shift fork assembly comprises a II and III gear shift fork drawer, and a II and III gear shift fork member fixed to the II and III gear shift fork drawer by fastening bolts, the II and III gear shift fork member being locked on the belt input wheel shaft assembly, a left groove, a middle groove and a right groove surrounding the outer diameter of the reverse gear shift fork shaft are provided at one end of the II and III gear shift fork drawer, and a through hole is provided at the other end of the II and III gear shift fork drawer; The fast and slow gear shift fork assembly includes a fast and slow gear shift fork shaft, and a fast and slow gear shift fork member fixed to the fast and slow gear shift fork shaft by fastening bolts, the fast and slow gear shift fork member is locked on the switching shaft assembly, one end of the fast and slow gear shift fork shaft is provided with a left groove and a right groove surrounding the outer diameter of the fast and slow gear shift fork shaft, and the other end of the fast and slow gear shift fork shaft is provided with a through hole; the I gear and reverse gear shift fork shaft, the II gear and III gear shift fork drawer and the fast and slow gear shift fork shaft respectively extend into the three groups of long holes, and the depths of the left groove, the middle groove and the right groove on the I gear and reverse gear shift fork shaft, the II gear and III gear shift fork drawer and the fast and slow gear shift fork shaft are the same as the radius of the gear shift self-locking steel ball.

4. The gearbox according to claim 2 or 3, characterized in that: When the middle groove is directly opposite to the gear shift self-locking steel ball, the gear shift self-locking steel ball is embedded in the groove under the pressure of the gear shift compression spring, and the speed change system is in the neutral position; when the left groove or the right groove is directly opposite to the gear shift self-locking steel ball, the gear shift self-locking steel ball is embedded in the groove under the pressure of the gear shift compression spring, and the speed change system is in the I gear, II gear, III gear or reverse gear position; when gear shifting is required, a certain axial force is applied to the I gear and II gear shift fork shaft, the reverse gear shift fork shaft, the III gear shift fork shaft, the I gear and reverse gear shift fork shaft, the II gear and III gear shift fork shaft, or the fast and slow gear shift fork shaft through the gear shift lever to overcome the pressure of the gear shift compression spring and move the gear shift self-locking steel ball from the left groove, the right groove or the middle groove The gear shift self-locking steel ball is pressed into the groove again, and the speed change system just shifts into another working gear or retreats into neutral gear. The distance between adjacent grooves ensures that the gears are in full tooth length meshing or completely out of meshing.

5. The gearbox according to claim 1, characterized in that: The cutter disc shift assembly also includes left and right cutter disc shift shaft bearings located on both sides of the shift sliding gear, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft; The shift sliding gear is divided into a gear portion and a smooth extension portion, and a positioning groove is provided on the smooth extension portion along its outer diameter, and the positioning groove is used to fix the cutter disc reversing fork member on the cutter disc reversing fork assembly, and the cutter disc reversing fork member is fixed to the cutter disc reversing fork shaft by a fastening bolt, and a through hole is provided on one end of the cutter disc reversing fork shaft, and the other end of the cutter disc reversing fork shaft is sleeved by a fixing member; or The cutter disc shift shaft assembly includes a cutter disc shift shaft, a cutter disc forward and reverse idle gear and a cutter disc forward and reverse gear self-locking mechanism arranged on the cutter disc shift shaft, the cutter disc forward and reverse gear self-locking mechanism includes a self-locking hole arranged on the cutter disc shift shaft, a reversing compression spring and a reversing self-locking steel ball installed in the self-locking hole, and a shift sliding gear, and a first groove, a second groove and a third groove with equal spacing are arranged in the axial direction of the inner hole of the shift sliding gear, and the depth of the first groove, the second groove and the third groove is the same as the radius of the reversing self-locking steel ball; The cutter disc shift assembly also includes left and right cutter disc shift shaft bearings located on both sides of the cutter disc forward and reverse idle gear and the shift sliding gear, and a bushing is embedded between the left and right cutter disc shift shaft bearings and the cutter disc shift shaft; The shift sliding gear is divided into a gear portion and a smooth extension portion, and a positioning groove is provided on the smooth extension portion along its outer diameter, and the positioning groove is used to fix the cutter disc reversing fork member on the cutter disc reversing fork assembly, and the cutter disc reversing fork member is fixed to the cutter disc reversing fork shaft by a fastening bolt, and a through hole is provided on one end of the cutter disc reversing fork shaft, and the other end of the cutter disc reversing fork shaft is ringed by a fixing member.

6. The gearbox according to claim 5, characterized in that: When the first groove or the third groove on the inner hole of the shift sliding gear is opposite to the reversing self-locking steel ball, the reversing self-locking steel ball is embedded in the corresponding groove under the pressure of the reversing compression spring, and the axial position of the shift sliding gear is fixed in the forward and reverse working gear, thereby preventing the cutter disc from automatically engaging and disengaging in the forward and reverse gears, and ensuring that the forward and reverse transmission gears are accurately meshed with the full tooth length; when gear shifting is required, a certain axial force is applied to the cutter disc reversing fork shaft through the shift lever, and the cutter disc reversing fork pushes the shift sliding gear to overcome the pressure of the reversing compression spring, and squeezes the reversing self-locking steel ball out of the first groove, the second groove or the third groove and pushes it back into the self-locking hole, and the shift sliding gear can slide over the reversing self-locking steel ball for axial movement; when the other groove moves to face the steel ball, the reversing self-locking steel ball is pressed into the groove again, and the speed change system just shifts into the forward and reverse working gear or retreats into neutral.

7. The gearbox according to claim 1, characterized in that: The belt input wheel shaft assembly also includes a belt input shaft bearing, a wheel shaft sliding double linkage gear, a wheel shaft reverse gear sliding gear, a III gear and a belt stopper arranged at the end of the belt input shaft. The wheel shaft sliding double linkage gear, the wheel shaft reverse gear sliding gear and the III gear rotate radially along the belt input bearing; the front end of the belt input shaft extends out of the gearbox housing and is connected to the belt pulley; The reverse gear shaft assembly comprises a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, on which a reverse gear driving gear and a reverse gear driven gear are arranged, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft; The central shaft assembly comprises a central shaft III gear, a central shaft main gear, a central shaft II gear, and a central shaft I gear, which are arranged on the central shaft; the two ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings; a spacing bushing is arranged between the central shaft III gear and the central shaft main gear, and an intermediate bushing is arranged between the central shaft II gear and the central shaft I gear; the central shaft is a spline shaft; the central shaft II gear and the central shaft I gear slide axially on the central shaft spline, and are respectively engaged in I gear, II gear, and forward and reverse gears; the central shaft III gear and the central shaft main gear slide axially on the central shaft spline, and are respectively engaged in III gear and reverse gears; The III gear shift shaft assembly comprises a III gear shift first gear and a III gear shift second gear arranged on the III gear shift shaft, wherein the III gear shift first gear and the III gear shift second gear are double-linked gears, which rotate radially on the III gear shift shaft, and the two ends of the III gear shift shaft are respectively mounted on the inner diameters of the left and right shift shaft bearings; The deceleration shaft assembly includes a deceleration shaft I assembly and a deceleration shaft II assembly, the deceleration shaft I assembly includes a first gear of the deceleration shaft I and a second gear of the deceleration shaft I arranged on the deceleration shaft I, the first gear of the deceleration shaft I and the second gear of the deceleration shaft I on the deceleration shaft I are double-linked gears, which rotate radially on the deceleration shaft I, and the two ends of the deceleration shaft I are installed on the inner diameters of the left and right deceleration shaft I bearings, and a spacing sleeve is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I, so that the first gear of the deceleration shaft I and the second gear of the deceleration shaft I are clamped on the gear portion of the deceleration shaft I; The deceleration shaft II assembly includes a first deceleration shaft II gear, a second deceleration shaft II gear, and a third deceleration shaft II gear, which are arranged on the deceleration shaft II. The two ends of the deceleration shaft II are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. An intermediate bushing is respectively arranged between the first deceleration shaft II gear and the second deceleration shaft II gear, and between the second deceleration shaft II gear and the third deceleration shaft II gear. The deceleration shaft II is a spline shaft. The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft; The output travel shaft assembly comprises two groups of travel shaft assemblies arranged symmetrically, the travel shaft assembly comprises a toothed clutch mechanism mounted on the driving shaft, the toothed clutch mechanism comprises a travel output gear mounted on the driving shaft, a bearing seat housing, an operating rod mounting seat, a movable clutch sleeve, and a travel sprocket, a bearing is arranged in the bearing seat housing, the bearing is mounted on the driving shaft, a return spring is arranged between the bearing and the movable clutch sleeve, and the return spring is located in the inner cavity of the operating rod mounting seat, a manual operating rod is arranged on the operating rod mounting seat, the manual operating rod is hinged with the connecting part of the operating rod mounting seat, and extends into the inner cavity of the operating rod mounting seat and is clamped on the fixing groove, the fixing groove is arranged on one end of the movable clutch sleeve close to the return spring, an outer gear is arranged along the outer diameter of the other end of the movable clutch sleeve, an inner gear sleeve matching the outer gear is arranged on the inner wall of the travel sprocket, an end cover is arranged on the side wall of the travel sprocket away from the movable clutch sleeve, a locating bearing is arranged between the end cover and the travel sprocket, and a sealing gasket is arranged between the end cover and the locating bearing; or The belt input wheel shaft assembly comprises a belt input shaft bearing arranged on the belt input shaft, a wheel shaft sliding double linkage gear, a wheel shaft reverse gear sliding gear, a III gear and a belt stopper arranged at the end of the belt input shaft, and the wheel shaft sliding double linkage gear, the wheel shaft reverse gear sliding gear and the III gear rotate radially along the belt input bearing; The front end of the belt input shaft extends out of the gearbox housing and is connected to the pulley; the reverse gear shaft assembly includes a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, and a reverse gear driving gear and a reverse gear driven gear are arranged on the small diameter portion, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft; The central shaft assembly comprises a central shaft III gear, a central shaft main gear, a central shaft II gear, and a central shaft I gear, which are arranged on the central shaft. The two ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings. A spacing bushing is provided between the central shaft III gear and the central shaft main gear, and an intermediate bushing is provided between the central shaft II gear and the central shaft I gear. The central shaft is a spline shaft. The central shaft II gear and the central shaft I gear slide axially on the central shaft spline to engage the I gear, II gear, and forward / reverse gear respectively. The center shaft III gear and the center shaft main gear slide axially on the center shaft spline to engage the III gear and the reverse gear respectively; The III gear shift shaft assembly comprises a III gear shift first gear and a III gear shift second gear arranged on the III gear shift shaft, wherein the III gear shift first gear and the III gear shift second gear are double-linked gears, which rotate radially on the III gear shift shaft, and the two ends of the III gear shift shaft are respectively mounted on the inner diameters of the left and right shift shaft bearings; The deceleration shaft assembly includes a deceleration shaft I assembly and a deceleration shaft II assembly, the deceleration shaft I assembly includes a first gear of the deceleration shaft I and a second gear of the deceleration shaft I arranged on the deceleration shaft I, the first gear of the deceleration shaft I and the second gear of the deceleration shaft I on the deceleration shaft I are double-linked gears, which rotate radially on the deceleration shaft I, and the two ends of the deceleration shaft I are installed on the inner diameters of the left and right deceleration shaft I bearings, and a spacing sleeve is provided between the left deceleration shaft I bearing and the first gear of the deceleration shaft I, so that the first gear of the deceleration shaft I and the second gear of the deceleration shaft I are clamped on the gear portion of the deceleration shaft I; The deceleration shaft II assembly includes a deceleration shaft II intermediate gear and a deceleration shaft II pinion gear arranged on the deceleration shaft II. The two ends of the deceleration shaft II are respectively mounted on the inner diameters of the left and right deceleration shaft II bearings. Bushings are respectively arranged between the deceleration shaft II intermediate gear and the deceleration shaft II pinion gear and the left and right deceleration shaft II bearings. The deceleration shaft II is a spline shaft. The speed reduction shaft II pinion meshes with the differential gear on the differential, the differential gear drives the planetary wheel carrier, and then the planetary wheels drive the left and right drive shafts; The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft; The output travel shaft assembly includes two groups of travel shaft assemblies arranged symmetrically, the travel shaft assembly includes a toothed clutch mechanism installed on the drive shaft, the toothed clutch mechanism includes a bearing seat housing and a travel sprocket installed on the drive shaft, a bearing is arranged in the bearing seat housing, the bearing is installed on the drive shaft, shaft seals are fixed on both end surfaces of the bearing seat housing by screws, the shaft seals are used to seal the bearings, the travel sprocket is arranged at the end of the drive wheel, an end cover is fixed on the side wall of the travel sprocket away from one end of the bearing seat housing, a sealing gasket is arranged on the inner side of the end cover, and is fixed to the drive shaft by fixing bolts; or The belt input pulley assembly includes a belt input shaft bearing, a sliding double gear of gear II and gear III, a sliding gear of gear I and reverse gear, a cutter disc transmission gear, and a belt stopper arranged at the end of the belt input shaft. The sliding double gear of gear II and gear III, the sliding gear of gear I and reverse gear, and the cutter disc transmission gear rotate radially along the belt input bearing; the front end of the belt input shaft extends out of the gearbox housing and is connected to the belt pulley; The reverse gear shaft assembly comprises a reverse gear shaft, which is composed of a small diameter portion and a large diameter portion, on which a reverse gear driving gear and a reverse gear driven gear are arranged, and an inner bushing is arranged between the reverse gear driving gear and the reverse gear driven gear and the small diameter portion, and the reverse gear driving gear is clamped axially by the bushing arranged on the small diameter portion, and the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate radially on the reverse gear shaft; The central shaft assembly includes a central shaft idle gear, a central shaft I gear, a central shaft III gear, a low speed gear and a central shaft II gear arranged on the central shaft, the two ends of the central shaft are respectively mounted on the inner diameters of the left and right central shaft bearings, and a spacing bushing is provided between the central shaft I gear and the central shaft III gear; The switching shaft assembly is a fast and slow gear switching shaft assembly, and the fast and slow gear switching shaft assembly includes a switching idler gear, a switching large gear and a switching small gear arranged on the fast and slow gear switching shaft, and the switching large gear and the switching small gear are double-linked gears, and the double-linked gear and the switching idler gear rotate radially on the fast and slow gear switching shaft, and the two ends of the fast and slow gear switching shaft are respectively mounted on the inner diameters of the left and right switching shaft bearings; The deceleration shaft assembly includes a deceleration pinion and a deceleration gear set on the deceleration shaft, the deceleration pinion and the deceleration gear are double-linked gears, which rotate radially on the deceleration shaft, and the two ends of the deceleration shaft are respectively mounted on the inner diameters of the left and right deceleration shaft bearings, and a spacing bushing is provided between the deceleration pinion and the left deceleration shaft bearing, so that the deceleration pinion and the deceleration gear are clamped on the gear part of the deceleration shaft; The gearbox also includes a differential assembly, which includes a differential gear, a left pinion, and a right pinion arranged on a differential shaft. Both ends of the differential shaft are respectively mounted on the inner diameters of left and right differential bearings. The differential gear meshes with the speed reduction pinion and drives the planetary gear set, which in turn drives the left pinion and the right pinion. The left pinion and the right pinion are respectively meshed with the travel output gears on the left and right drive shafts. The cutter disc reversing shaft assembly comprises a reversing first gear and a reversing second gear arranged on the reversing shaft, the two ends of the reversing shaft are respectively mounted on the inner diameters of the left and right reversing shaft bearings, the reversing first gear and the reversing second gear are linkage gears, which rotate radially on the reversing shaft, and a spacing bushing is arranged between the left reversing shaft bearing and the reversing first gear, so that the reversing first gear and the reversing second gear are clamped on the gear part of the reversing shaft; The output travel shaft assembly includes two groups of travel shaft mechanisms arranged symmetrically, and the travel shaft mechanism includes a toothed clutch mechanism installed on the drive shaft, and the toothed clutch mechanism includes a travel output gear, a bearing seat housing and a travel sprocket installed on the drive shaft. A bearing is provided in the bearing seat housing, and the bearing is installed on the drive shaft. Shaft seals are fixed on both end surfaces of the bearing seat housing by screws, and the shaft seals are used to seal the bearings. The travel sprocket is arranged at the end of the drive wheel, and an end cover is fixed on the side wall of the travel sprocket away from one end of the bearing seat housing, and a sealing gasket is provided on the inner side of the end cover, which is fixed to the drive shaft by fixing bolts.

8. The gearbox according to claim 7, characterized in that: The transmission route is: ① Travel gear I, II: pulley → belt input shaft → wheel shaft sliding double gear → center shaft gear II or center shaft gear I → center shaft main gear → switch to first gear in gear III, switch to second gear in gear III → first gear of speed reduction shaft I, second gear of speed reduction shaft I → second gear of speed reduction shaft II → first gear of speed reduction shaft II, third gear of speed reduction shaft II → travel output gear → left and right drive shafts → travel sprocket; ② Travel gear III, reverse gear: pulley → belt input shaft → gear III or axle reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft main gear or center shaft gear III → switch to first gear for gear III, switch to second gear for gear III → first gear for speed reduction shaft I, second gear for speed reduction shaft I → second gear for speed reduction shaft II → first gear for speed reduction shaft II, third gear for speed reduction shaft II → travel output gear → left and right driving wheels → travel sprocket; ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft → wheel shaft sliding double gear → center shaft I gear → center shaft main gear → reverse first gear, reverse second gear → shift sliding gear → cutter disc shift shaft; or ① Travel gear I, II: pulley → belt input shaft → wheel shaft sliding double gear → center shaft gear II or center shaft gear I → center shaft main gear → switch to first gear in gear III, switch to second gear in gear III → first gear of speed reduction shaft I, second gear of speed reduction shaft I → intermediate gear of speed reduction shaft → small gear of speed reduction shaft II → large gear of differential → planetary gear → left and right drive shafts → travel sprocket; ② Travel gear III, reverse gear: pulley → belt input shaft → gear III or axle reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft main gear or center shaft gear III → switch to first gear in gear III, switch to second gear in gear III → first gear of speed reduction shaft I, second gear of speed reduction shaft I → intermediate gear of speed reduction shaft II → small gear of speed reduction shaft II → large gear of differential → planetary gear → left and right drive shafts → travel sprocket; ③ Forward and reverse rotation of the cutter disc output shaft: pulley → belt input shaft → wheel shaft sliding double gear → center shaft I gear → center shaft main gear → reverse first gear, reverse second gear → shift sliding gear → cutter disc shift shaft; or ① Travel slow gear I gear and reverse gear: pulley → belt input shaft → I gear and reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft I gear → low speed gear → switch idle gear → switch large gear, switch small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket; ② Travel slow gear II and III: pulley → belt input shaft → sliding double gears of II and III gears → center shaft III gear or center shaft II gear → low speed gear → switch to neutral gear → switch to large gear, switch to small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket; ③ Fast and slow gear shifting position: center shaft → low speed gear → switch to neutral gear → switch to small gear, switch to small gear → reduce speed to large gear; ④ Fast travel gear I and reverse gear: pulley → belt input shaft → I and reverse gear sliding gear → reverse gear driving gear, reverse gear driven gear → center shaft I gear → switching large gear, switching small gear → speed reduction large gear, speed reduction small gear → differential large gear → left small gear, right small gear → travel output gear → drive wheel → travel sprocket; ⑤ Fast travel gear II and III: pulley → belt input shaft → sliding double gears of gear II and gear III → gear of center shaft gear III or gear of center shaft gear II → gear of center shaft gear I → switching large gear, switching small gear → large gear for speed reduction, small gear for speed reduction → large gear of differential → small gear on the left, small gear on the right → travel output gear → driving wheel → travel sprocket; ⑥ Cutter disc output shaft forward and reverse rotation: pulley → belt input shaft → cutter disc transmission gear → center shaft idle gear → reverse first gear, reverse second gear → cutter disc forward and reverse idle gear → shift sliding gear → cutter disc shift shaft.

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