A durable high-load small agricultural vehicle transmission system

Abstract

The utility model discloses a durable high-load small agricultural machinery vehicle transmission system, comprising a gearbox, a front drive axle and a rear drive axle, wherein the gearbox is connected to the front drive axle and the rear drive axle through transmission shafts respectively, and the gearbox comprises a gearbox housing, an input shaft, a main transmission shaft, an output shaft and a speed shift fork assembly, wherein a plurality of driving gears are fixedly connected to the input shaft, a plurality of driven gears rotatably meshed with the main transmission shaft are arranged on the main transmission shaft, a plurality of transition gears fixedly connected to the main transmission shaft and a first transmission gear are fixedly connected to the transition gear, a connecting sleeve is movably connected to the transition gear, the connecting sleeve is used for fixedly connecting the driven gear and the transition gear, a second transmission gear used for meshing with the first transmission gear is fixedly connected to the output shaft, and the speed shift fork assembly is used for controlling the movement of the connecting sleeve.

Description

Technical Field

[0001] The utility model relates to a durable high-load small agricultural machinery vehicle transmission system. Background Art

[0002] Agricultural machinery refers to various machines used in the production process of crop planting and animal husbandry, as well as in the primary processing and treatment of agricultural and animal products. Agricultural machinery includes agricultural power machinery, farmland construction machinery, soil tillage machinery, planting and fertilization machinery, plant protection machinery, farmland irrigation and drainage machinery, crop harvesting machinery, agricultural product processing machinery, animal husbandry machinery and agricultural transport machinery.

[0003] The vehicle transmission system of agricultural machinery is an important transmission part. The gearbox plays an important role in changing the forward and backward direction of the vehicle and changing the torque of the gearbox. The shift mechanism is of utmost importance. How to simplify the structure of the shift mechanism and facilitate subsequent maintenance is always an issue that needs attention. Utility Model Content

[0004] The purpose of the utility model is to solve the deficiencies of the above prior art and to provide a durable high-load small agricultural vehicle transmission system.

[0005] A durable high-load small agricultural vehicle transmission system includes a gearbox, a front drive axle, and a rear drive axle. The gearbox is connected to the front drive axle and the rear drive axle through transmission shafts. The gearbox includes a gearbox housing, an input shaft, a main transmission shaft, an output shaft, and a speed shift fork assembly. A plurality of driving gears are fixedly connected to the input shaft. The main transmission shaft is provided with a plurality of driven gears rotatably meshed with the main transmission shaft, a plurality of transition gears fixedly connected to the main transmission shaft, and a first transmission gear. A connecting sleeve is movably connected to the transition gear, and the connecting sleeve is used to fixedly connect the driven gear and the transition gear. A second transmission gear used to mesh with the first transmission gear is fixedly connected to the output shaft. The speed shift fork assembly is used to control the movement of the connecting sleeve.

[0006] The speed shift fork assembly includes a rocker arm assembly, a shift fork, and a shift fork shaft. The shift fork is a cylindrical structure, and a through hole along the axis direction is provided at the center of the bottom surface thereof. The shift fork is also provided with shift fork feet of the same number as the connecting sleeve, and the bottom of the shift fork feet is connected to the connecting groove of the connecting sleeve. The shift fork is movably sleeved on the shift fork shaft, and a plurality of gear stop points are provided at intervals on the shift fork shaft.

[0007] The rocker arm assembly comprises a first rocker, two second rockers, two third rockers, a first connecting rod, and a second connecting rod, wherein the first end of the first rocker is hinged on the first fixing seat, the first end of the second rocker is hinged on the second fixing seat, the first fixing seat is located above the second fixing seat, and the hinge of the first end of the first rocker is located between the hinges of the first ends of the two second rockers;

[0008] The two ends of the first connecting rod are respectively hinged to the first ends of the two third rockers, the second end of the first rocker is hinged to the center of the first connecting rod, the second ends of the two third rockers are respectively connected to the two ends of the second connecting rod, and the second ends of the two second rockers are respectively hinged to the same position of the middle section of a third rocker; wherein the distance between the hinges of the two ends of the second rocker is a, the vertical distance between the hinge of the first fixing seat and the hinge of the second fixing seat is b, and a=b;

[0009] The second connecting rod is fixedly connected to the shift fork;

[0010] The input shaft, main transmission shaft and output shaft are all installed in the transmission housing through bearings arranged on both sides of the gear parts. The main transmission shaft is located between the input shaft and the output shaft. One end of the input shaft extends out of the housing and is connected to the power input device, one end of the main transmission shaft extends out of the housing and is connected to the brake, and both ends of the output shaft extend out of the housing and are connected to the front wheel axle and the rear wheel axle respectively.

[0011] Preferably, the hinge of the first end of the first rocker is located on the midline of the line between the hinges of the first ends of the two second rockers, and the hinges of the first sections of the second rockers are located at the same height.

[0012] Preferably, the input shaft is provided with a first gear driving gear, a second gear driving gear, and a third gear driving gear in sequence, wherein the second gear driving gear and the first gear driving gear are integrally formed with the input shaft, and the third gear gear is fixedly connected to the input shaft through a spline structure.

[0013] One side of the third gear is in contact with the retaining ring, and the other side is in contact with one side of the bearing. The retaining ring is embedded in the groove of the input shaft. An oil seal is provided on the other side of the bearing. One end of the input shaft is connected to one end of the spline sleeve through a spline structure, and the other end of the spline sleeve is connected to the power input shaft of the continuously variable transmission.

[0014] Preferably, the main speed change shaft is provided with a bearing, a third gear driven gear, a first transition gear, a second gear driven gear, a first transmission gear, a second transition gear, a first gear driven gear spacer, a bearing, and a brake in sequence. The first gear driven gear, the second gear driven gear, and the third gear driven gear are respectively sleeved on the outside of the needle bearing, the needle bearing is sleeved on the outside of the bearing inner ring, and the bearing inner ring is sleeved on the outside of the main speed change shaft.

[0015] Preferably, a thrust plate is provided between the first transmission gear and the inner ring of the bearing where the second gear driven gear is located. The thrust plate abuts against the inner ring of the bearing, the needle bearing and the second gear driven gear to limit the inner ring of the bearing, the needle bearing and the second gear driven gear.

[0016] Preferably, the first transmission gear is fixedly connected to the main transmission shaft via a spline structure, and retaining rings are provided on both sides of the first transmission gear, which are embedded in the grooves on the main transmission shaft.

[0017] Preferably, the driven gear includes a gear part and an external spline part, the gear part is used to mesh with the driving gear, and the external spline part is used to connect with the connecting sleeve, the connecting sleeve is a hollow structure, and its inner wall is provided with an internal spline structure, and the outer side of the transition gear is provided with an external spline structure.

[0018] Preferably, a front spline connection seat, a bearing, an output gear, a bearing, and a rear spline connection seat are sequentially provided on the output shaft. Oil seals are provided on one side of the two bearings close to both ends of the output shaft. The front spline connection seat and the rear spline connection seat are respectively installed on both ends of the output shaft through nuts and gaskets, and are respectively connected to the front wheel axle and the rear wheel axle. The output gear is fixedly connected to the output shaft through a spline structure.

[0019] Preferably, the gear stop point is a first annular groove, the cross-section of the first annular groove is trapezoidal, the width of the groove mouth is greater than the width of the groove bottom, a first plurality of annular grooves are provided on the outer arc surface of the shift fork shaft, a second annular groove with the shift fork axis as the center is provided on the bottom surface of the shift fork and located outside the edge of the through hole mouth, a plurality of circular holes are provided on the inner side wall of the second annular groove close to the axis at intervals in the circumferential direction, a spherical card bead is movably provided in the circular hole, and a compression spring is provided between the card bead and the inner side wall of the second annular groove away from the shift fork axis.

[0020] Beneficial effects: Compared with the prior art, the utility model comprises a first rocker arm, two second rockers, two third rockers, a first connecting rod and a second connecting rod to form a rocker arm assembly. By driving the first rocker arm or the second rocker arm, the entire mechanism moves, thereby driving the second connecting rod to drive the shift fork to move on the shift fork shaft to achieve gear shifting. The structure uses pure mechanical transmission, has a simple structure, is easy to process and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the gearbox at one angle;

[0022] Figure 2 This is another angled cross-sectional view of the gearbox;

[0023] Figure 3 is a schematic diagram of the input shaft assembly;

[0024] Figure 4 is a schematic diagram of the input shaft;

[0025] Figure 5 is a schematic diagram of the main transmission shaft assembly;

[0026] Figure 6 It is a schematic diagram of the main transmission shaft;

[0027] Figure 7 is a schematic diagram of the output shaft assembly;

[0028] Figure 8 is a schematic diagram of the output shaft;

[0029] Fig. 9 It is a schematic diagram of the working principle of the speed shift fork assembly;

[0030] Fig.10 is a front view of the shift fork assembly;

[0031] Fig.11 It is a schematic diagram of the assembly of the shift fork and the shift fork shaft;

[0032] In the figure, 1, input shaft assembly, 2, main speed change shaft assembly, 3, output shaft assembly, 4, speed change fork assembly, 101, connecting spline sleeve, 102, input shaft, 103, oil seal 1, 104, bearing 1, 105, third gear driving gear, 106, retaining ring 1, 107, bearing 2, 1021, external spline 1, 1022, bearing gear 1, 1023, external spline 2, 1024, slot 1, 1025, second gear driving gear, 1026, first gear driving gear, 1027, bearing gear 2, 201, bearing 3, 202, main speed change shaft, 203, third gear driven gear Gear, 204, needle roller bearing three, 205, bearing inner ring three, 206, spline sleeve one, 207, spline transition wheel one, 208, second gear driven gear, 209, needle roller bearing two, 210, bearing inner ring two, 211, thrust plate, 212, retaining ring two, 213, first transmission gear, 214, retaining ring three, 215, spline sleeve two, 216, spline transition wheel two, 217, first gear driven gear, 218, needle roller bearing one, 219, bearing inner ring one, 220, spacer, 221, bearing four, 222, brake, 2201, bearing gear three, 2 0202, optical axis three, 20203, external spline three, 20204, optical axis two, 20205, slot two, 20206, external spline four, 20207, slot three, 20208, external spline five, 20209, optical axis one, 20210, bearing gear four, 20211, external spline six, 301, rear spline connection seat, 302, oil seal two, 303, bearing five, 304, output shaft, 305, output gear, 306, retaining ring four, 307, bearing six, 308, oil seal three, 309, front spline connection seat, 3010, locking nut, 3011 , gasket, 3012, spring pin, 401, rocker arm assembly, 4011, first rocker, 4012, second rocker, 4013, third rocker, 4014, first connecting rod, 4015, second connecting rod, 4016, first fixed seat, 4017, second fixed seat, 402, double shift fork, 4021, card ball, 4022, shift fork foot one, 4023, shift fork foot two, 403, shift fork shaft, 4031, first marble groove, 4032, second marble groove, 4033, third marble groove, 4034, fourth marble groove, 4035, fifth marble groove. DETAILED DESCRIPTION

[0033] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0034] As shown in the figure, input shaft assembly 1, main speed change shaft assembly 2, output shaft assembly 3, speed change fork assembly 4, connecting spline sleeve 101, input shaft 102, oil seal 103, bearing 104, third gear driving gear 105, retaining ring 106, bearing 2 107, external spline 1021, bearing gear 1 1022, external spline 2 1023, slot 1024, second gear driving gear 1025, first gear driving gear 1026, bearing gear 2 1027, bearing 3 201, main speed change shaft 202, third gear driven gear 20 3. Needle roller bearing three 204, bearing inner ring three 205, spline sleeve one 206, spline transition wheel one 207, second gear driven gear 208, needle roller bearing two 209, bearing inner ring two 210, thrust plate 211, retaining ring two 212, first transmission gear 213, retaining ring three 214, spline sleeve two 215, spline transition wheel two 216, first gear driven gear 217, needle roller bearing one 218, bearing inner ring one 219, spacer 220, bearing four 221, brake 222, bearing gear three 20201, optical axis 30202, external spline 30203, optical axis 20204, slot 20205, external spline 40206, slot 30207, external spline 50208, optical axis 10209, bearing stop 40210, external spline 60211, rear spline connection seat 301, oil seal 202, bearing 503, output shaft 304, output gear 305, retaining ring 406, bearing 607, oil seal 308, front spline connection seat 309, locking nut 3010, gasket 30 11, spring pin 3012, rocker arm assembly 401, first rocker 4011, second rocker 4012, third rocker 4013, first connecting rod 4014, second connecting rod 4015, first fixing seat 4016, second fixing seat 4017, double shift fork 402, card bead 4021, shift fork foot 1 4022, shift fork foot 2 4023, shift fork shaft 403, first marble groove 4031, second marble groove 4032, third marble groove 4033, fourth marble groove 4034, fifth marble groove 4035;

[0035] A wheeled machine four-wheel drive gearbox mainly consists of an input shaft assembly 1, a main speed change shaft assembly 2, an output shaft assembly 3, a speed change fork assembly 4, a gearbox upper cover, a gearbox housing, etc.

[0036] The input shaft assembly 1 is composed of a connecting spline sleeve 101, an input shaft 102, an oil seal 103, a bearing 104, a third gear driving gear 105, a retaining ring 106, and a bearing 2 107.

[0037] The input shaft 102 is provided with an external spline 1021, a bearing stop 1022, an external spline 2 1023, a second gear driving gear 1025, a first gear driving gear 1026, and a bearing stop 2 1027. A slot is provided on the external spline 2 1023.

[0038] The bearing 1 104 and the bearing 2 107 are installed at the bearing stop 1 1022 and the bearing stop 2 1027 of the input shaft 102 respectively.

[0039] The center of the third gear driving gear 105 is an inner spline hole structure, and the outer circle is a gear structure. The inner spline of the third gear driving gear 105 matches with the second outer spline 1023 of the input shaft 102. The third gear driving gear 105 is installed on the second outer spline 1023 of the input shaft 102 through the inner spline, and the retaining ring is installed in the first slot 1024 of the input shaft 102, which plays a limiting role for the third gear driving gear 105.

[0040] The center of the connecting spline sleeve 101 is an inner spline hole structure. The inner spline of the connecting spline sleeve 101 matches with the outer spline 1021 of the input shaft 102.

[0041] The input shaft assembly 1 is installed inside the gearbox housing by means of bearing 104 and bearing 2 107, and the external spline 1021 of the input shaft 102 extends out of the gearbox housing. The oil seal 103 is installed on the outer circle of the bearing 1022 of the input shaft 102. The outer circle of the oil seal fits the inner wall of the oil seal hole to play a role in sealing and preventing leakage. One end of the connecting spline sleeve 101 is installed on the external spline 1021 of the input shaft 102. (The other end of the connecting spline sleeve 101 is installed with the external spline of the continuously variable transmission power input shaft 102 to realize power input.)

[0042] The main speed change shaft assembly 2 is composed of a bearing three 201, a main speed change shaft 202, a third gear driven gear 203, a needle roller bearing three 204, a bearing inner ring three 205, a spline sleeve one 206, a spline transition wheel one 207, a second gear driven gear 208, a needle roller bearing two 209, a bearing inner ring two 210, a thrust plate 211, a retaining ring two 212, a first transmission gear 213, a retaining ring three 214, a spline sleeve two 215, a spline transition wheel two 216, a first gear driven gear 217, a needle roller bearing two 218, a bearing inner ring one 219, a spacer 220, a bearing four 221, and a brake 222.

[0043] The main transmission shaft 202 has a bearing gear 3 20201, a light shaft 3 20202, an external spline 3 20203, a light shaft 2 20204, an external spline 4 20206, an external spline 5 20208, a light shaft 1 20209, a bearing gear 4 20210, and an external spline 6 20211. A clamping groove 20205 and a clamping groove 3 20207 are provided on the external spline 4 20206.

[0044] Bearing three 201 and bearing four 221 are respectively installed at bearing gear three 20201 and bearing gear four 20210 of the main speed change shaft 202.

[0045] The interior of the bearing inner ring three 205 is a smooth through hole structure, and the size of the through hole is equal to the size of the outer circle of the optical axis three 20202.

[0046] The inner ring 3 of the bearing 205 is mounted on the outer circle of the optical axis 3 20202 of the speed change shaft.

[0047] Needle roller bearing three 204 is installed on the outer circle of bearing inner ring three 205.

[0048] The third gear driven gear 203 is a step structure, the large outer circle is a gear structure, the small outer circle is an external spline structure, and the center is a smooth through hole structure, and the through hole size is equal to the outer circle size of the needle bearing 3 204. The third gear driven gear 203 is installed on the outer circle of the needle bearing 3 204 and can flexibly idle.

[0049] The outer circle of the spline transition wheel 207 is an external spline structure, and the center is an internal spline hole structure. The parameters of the external spline of the spline transition wheel 207 are consistent with the parameters of the external spline of the small outer circle of the third gear driven gear 203. The internal spline of the spline transition wheel 207 matches the external spline 3 20203 of the main speed change shaft 202. The spline transition wheel 207 is installed on the external spline 3 20203 of the main speed change shaft 202.

[0050] The interior of the second bearing inner ring 210 is a smooth through hole structure, and the size of the through hole is equal to the outer diameter of the second optical axis 20204. The second bearing inner ring 210 is installed on the outer diameter of the second optical axis 20204 of the main transmission shaft 202. The left end of the second bearing inner ring 210 is in contact with the end surface of the spline transition wheel 1 207, and the right end is installed with a thrust plate 211. The thrust plate 211 has a limiting effect on the second bearing inner ring 210, the second needle bearing 209, and the second gear driven gear 208 to prevent axial movement.

[0051] Needle roller bearing 209 is installed on the outer circle of bearing inner ring 210.

[0052] The second gear driven gear 208 is a step structure, the large outer circle is a gear structure, and the small outer circle is an external spline structure. The parameters of the external spline of the small outer circle of the second gear driven gear 208 are consistent with the parameters of the external spline of the small outer circle of the third gear driven gear 203. The center of the second gear driven gear 208 is a smooth through hole structure, and the size of the through hole is equal to the size of the outer circle of the needle roller bearing 209. The second gear driven gear 208 is installed on the outer circle of the needle roller bearing 209 and can flexibly rotate. The length of the bearing inner ring 210 is greater than the thickness of the second gear driven gear 208, so that there is a gap between the second gear driven gear 208 and the spline transition wheel 1 207, and there will be no jamming during the mutual rotation.

[0053] The center of the first transmission gear 213 is an inner spline hole structure, and the outer circle is a gear structure. The inner spline of the first transmission gear 213 matches with the outer spline 4 20206 of the main speed change shaft 202. The first transmission gear 213 is installed on the outer spline 4 20206 of the main speed change shaft 202 through the inner spline, and the retaining ring 212 and the retaining ring 3 214 are respectively installed in the clamping groove 20205 and the clamping groove 3 20207 of the main speed change shaft 202, which play a role in limiting the first transmission gear 213.

[0054] The outer circle of the spline sleeve 206 has an annular groove structure, and the center is an inner spline hole structure. The width of the spline sleeve 206 is smaller than the width of the spline transition wheel 207. The inner spline of the spline sleeve 206 matches the small outer circle external spline of the third gear driven gear 203, the outer spline of the spline transition wheel 207, and the small outer circle external spline of the second gear driven gear 208. The spline sleeve 206 is installed on the outer spline of the spline transition wheel 207. The spline sleeve 206 can slide freely left and right along the small outer circle external spline of the third gear driven gear 203, the outer spline of the spline transition wheel 207, and the small outer circle external spline of the second gear driven gear 208 under the action of the shift fork foot 4022.

[0055] The outer circle of the spline transition wheel 216 is an external spline structure, and the center is an internal spline hole structure. The internal spline of the spline transition wheel 216 matches the external spline 5 20208 of the main speed change shaft 202. The spline transition wheel 216 is installed on the external spline 5 20208 of the main speed change shaft 202.

[0056] The inner ring 1 of the bearing 219 has a smooth through hole structure, and the size of the through hole is equal to the outer diameter of the optical axis 1 20209. The inner ring 1 of the bearing 219 is installed on the outer diameter of the optical axis 1 20209 of the main transmission shaft 202. The left end of the inner ring 1 of the bearing 219 fits with the end face of the spline transition wheel 2 216, and the right end fits with the spacer 220.

[0057] Needle roller bearing 218 is installed on the outer circle of bearing inner ring 1 219.

[0058] The first gear driven gear 217 is a step structure, the large outer circle is a gear structure, and the small outer circle is an external spline structure. The parameters of the external spline of the small outer circle of the first gear driven gear 217 are consistent with the parameters of the external spline of the spline transition wheel 216. The center of the first gear driven gear 217 is a smooth through hole structure, and the size of the through hole is equal to the size of the outer circle of the needle roller bearing 218. The first gear driven gear 217 is installed on the outer circle of the needle roller bearing 218 and can flexibly rotate. The length of the inner ring 1 219 of the bearing is greater than the thickness of the first gear driven gear 217, so that there is a gap between the first gear driven gear 217 and the spline transition wheel 216, and there will be no jamming during the mutual rotation.

[0059] The outer circle of the spline sleeve 215 has an annular groove structure, and the center is an inner spline hole structure. The width of the spline sleeve 215 is smaller than the width of the spline transition wheel 216. The inner spline of the spline sleeve 215 matches the outer spline of the spline transition wheel 216 and the small outer circle outer spline of the first gear driven gear 217. The spline sleeve 215 is installed on the outer spline of the spline transition wheel 216. The spline sleeve 215 can slide freely left and right along the outer spline of the spline transition wheel 216 and the small outer circle outer spline of the first gear driven gear 217 under the action of the shift fork foot 24023.

[0060] Among them, the spline sleeve is the connecting sleeve;

[0061] The spacer 220 is installed on the main transmission shaft 202, and is located between the first gear driven gear 217 and the bearing 4 221, and plays a transition and limiting role.

[0062] The main speed change shaft assembly 2 is installed inside the gearbox housing by means of bearing three 201 and bearing four 221, and the large outer gear part of the third gear driven gear 203 is meshed with the outer gear part of the third gear driving gear 105, the large outer gear part of the second gear driven gear 208 is meshed with the second gear driving gear 1025 on the input shaft 102, and the large outer gear part of the first gear driven gear 217 is meshed with the first gear driving gear 1026 on the input shaft 102. And the external spline six 20211 part of the main speed change shaft 202 extends out of the housing. The brake 222 is installed on the external spline six 20211 of the main speed change shaft 202 and is fixed to the gearbox housing with bolts to brake the transmission system.

[0063] The output shaft assembly 3 is composed of a front spline connection seat 309, an oil seal 2 302, a bearing 5 303, an output shaft 304, an output gear 305, a retaining ring 4 306, a bearing 6 307, an oil seal 308, a rear spline connection seat 301, a locking nut 3010, a gasket 3011, and a spring pin 3012.

[0064] The output shaft 304 is provided with an external thread, a pin hole, an external spline 7, a bearing stop 5, an external spline 8, a bearing stop 6, and an external spline 9. A slot is provided on the external spline 8.

[0065] The center of the output gear 305 is an inner spline hole structure, and the outer circle is a gear structure. The inner spline of the output gear 305 matches the outer spline eight of the output shaft 304. The output gear 305 is installed on the outer spline eight of the output shaft 304 through the inner spline, and the retaining ring four 306 is installed in the card slot of the output shaft 304 to limit the output gear 305.

[0066] The fifth bearing 303 and the sixth bearing 307 are respectively mounted at the fifth bearing stop and the sixth bearing stop of the output shaft 304 .

[0067] The output shaft assembly 3 is installed inside the gearbox housing by means of the bearing 5 303 and the bearing 6 307, and the external spline 7 and the external spline 9 of the output shaft 304 extend out of the gearbox housing. The oil seal 2 302 and the oil seal 3 308 are installed on the outside of the bearing 5 303 and the bearing 6 307 in half, and the outer circle of the oil seal fits the inner wall of the oil seal hole to play a role in sealing and preventing leakage.

[0068] The front spline connection seat 309 and the rear spline connection seat 301 are respectively installed on the outer spline 9 and the outer spline 7 of the output shaft 304, and are fixed and locked by a spring pin 3012, a gasket 3011, and a locking nut 3010. The front spline connection seat 309 and the rear spline connection seat 301 are then connected to the front and rear wheel bridges of the vehicle to transmit power to the front and rear wheels to realize the four-wheel drive travel of the vehicle.

[0069] The speed shift fork assembly 4 is composed of a rocker arm assembly 401 , a double shift fork 402 , and a shift fork shaft 403 .

[0070] The fork shaft 403 has a first marble groove 4031, a second marble groove 4032, a third marble groove 4033, a fourth marble groove 4034, and a fifth marble groove 4035. Both ends of the fork shaft 403 are fixedly mounted inside the gearbox housing, and the marble grooves are gear stop points.

[0071] The double shift fork 402 is mounted on the shift fork shaft 403, and the shift fork foot 1 4022 of the double shift fork 402 is inserted into the outer circular groove of the spline sleeve 1 206, and the shift fork foot 2 4023 of the double shift fork 402 is inserted into the outer circular groove of the spline sleeve 215, and the double shift fork is a shift fork.

[0072] The rocker arm assembly includes a first rocker arm 4011, two second rockers 4012, two third rockers 4013, a first connecting rod 4014, and a second connecting rod 4015. The first end of the first rocker arm 4011 is hinged on a first fixing seat 4016, the first end of the second rocker arm 4012 is hinged on a second fixing seat 4017, the first fixing seat 4016 is located above the second fixing seat 4017, and the hinge of the first end of the first rocker arm 4011 is located between the hinges of the first ends of the two second rockers 4012.

[0073] The two ends of the first connecting rod 4014 are respectively hinged to the first ends of the two third rocking arms 4013, the second end of the first rocking arm 4011 is hinged to the center of the first connecting rod 4014, the second ends of the two third rocking arms 4013 are respectively connected to the two ends of the second connecting rod 4015, and the second ends of the two second rocking arms 4012 are respectively hinged to the same position of the middle section of a third rocking arm 4013; wherein, the distance between the hinges of the two ends of the second rocking arm 4012 is a, and the vertical distance between the hinge of the first fixing seat 4016 and the hinge of the second fixing seat 4017 is b, and a=b;

[0074] The second connecting rod 4015 is fixedly connected to the shift fork; wherein, the first rocker arm 4011 or the second rocker arm 4012 is an active rod; one end of the first rocker arm or the second rocker arm is fixedly connected to a rotating shaft, the rotating shaft is hinged on a fixed seat, and a transmission gear is provided on the rotating shaft, and the transmission gear drives the first rocker arm or the second rocker arm as the active rod to move through gear transmission.

[0075] The gear stop point is the first annular groove, the cross-section of the first annular groove is trapezoidal, the width of the groove mouth is greater than the width of the groove bottom, a first plurality of annular grooves are provided on the outer arc surface of the fork shaft, and a second annular groove with the fork axis as the center is provided on the bottom surface of the fork and located outside the edge of the through hole. A plurality of circular holes are provided on the inner side wall of the second annular groove close to the axis at intervals in the circumferential direction, a spherical card bead 4021 is movably provided in the circular hole, and a compression spring is provided between the card bead 4021 and the inner side wall of the second annular groove away from the fork axis.

[0076] The shift fork is limited by the locking bead 4021 being stuck in the first annular groove, and the compression spring is used to prevent the locking bead 4021 from escaping from the first annular groove due to vibration. Since the cross-section of the first annular groove is a trapezoidal structure that is wide at the top and narrow at the bottom, when axial pressure is applied to the shift fork, the locking bead 4021 can move along the inclined surface until the next gear stop point due to the elastic properties of the spring.

[0077] Rotating the rocker assembly 401 can make the double shift fork 402 move left and right between the ball grooves on the shift fork shaft 403, thereby driving the spline sleeve 1 206 to slide freely left and right on the small outer circle external spline of the third gear driven gear 203, the external spline of the spline transition wheel 1 207 and the small outer circle external spline of the second gear driven gear 208, and the spline sleeve 215 to slide freely left and right on the external spline of the spline transition wheel 216 and the small outer circle external spline of the first gear driven gear 217.

[0078] Specific operation process: power is inputted through the connecting spline sleeve, driving the input shaft 102 to rotate, thereby driving the third gear driving gear 105, the second gear driving gear 1025 and the first gear driving gear 1026 to rotate at the same time.

[0079] At this time, the brake 222 is in a released state;

[0080] The double shift fork 402 is positioned on the first marble groove 4031 of the shift fork shaft 403, so that the spline sleeve 1 206 is simultaneously located on the third gear driven gear 203 and the spline transition wheel 1 207, realizing the interlocking of the two, and the spline sleeve 215 is entirely located on the spline transition wheel 216, so that the main speed change shaft can rotate at the speed of the third gear, while the first gear driven gear and the second gear driven gear are in idling;

[0081] Then the first transmission gear 213 drives the meshing output gear 305 to rotate at the third gear speed. The output gear 305 drives the output shaft 304 to rotate. The output shaft 304 drives the front spline connection seat 309 and the rear spline connection seat 301 at both ends to rotate, and transmits power to the front and rear wheels, so that the vehicle can travel at the third gear speed and four-wheel drive.

[0082] When the vehicle needs to shift gears, the rocker arm assembly 401 is moved to position the double shift fork 402 on the second ball groove 4032 of the shift fork shaft 403, so that the spline sleeve 1 206 is located as a whole on the spline transition wheel 1 207, and does not contact the third gear driven gear 203 and the second gear driven gear 208. At the same time, the spline sleeve 215 is located as a whole on the spline transition wheel 216, and does not contact the first gear driven gear 217. At this time, the first gear driven gear, the second gear driven gear and the third gear driven gear are all in idling and cannot drive the main transmission shaft to rotate.

[0083] Therefore, the power is cut off at the main transmission shaft assembly 2, and no power is transmitted to the front and rear wheels. Finally, the vehicle can only operate at a neutral speed (stop state).

[0084] When the rocker arm assembly 401 is turned, the double shift fork 402 is positioned on the third ball groove 4033 of the shift fork shaft 403, so that the spline sleeve 1 206 is located on the spline transition wheel 1 207 and the second gear driven gear 208 at the same time, realizing the interlocking of the two. At the same time, the spline sleeve 215 is located as a whole on the spline transition wheel 216 and does not contact the first gear driven gear 217. At this time, the second gear drives the main speed shaft to rotate, while the first gear driven gear and the third gear gear are idling; the vehicle runs at the second gear speed four-wheel drive.

[0085] When the rocker arm assembly 401 is turned, the double shift fork 402 is positioned on the fourth ball groove 4034 of the shift fork shaft 403, so that the spline sleeve 1 206 is located as a whole on the second gear driven gear 208, and does not contact the third gear driven gear 203 and the spline transition wheel 1 207; the spline sleeve 215 is located as a whole on the spline transition wheel 216, and does not contact the first gear driven gear 217. At this time, the first gear driven gear, the second gear driven gear and the third gear driven gear are all in idling, unable to drive the main transmission shaft to rotate, and the vehicle operates at neutral speed (stop state).

[0086] When the rocker arm assembly 401 is turned, the double shift fork 402 is positioned on the fifth ball groove 4035 of the shift fork shaft 403, so that the spline sleeve 1 206 is located on the second gear driven gear 208 as a whole, and does not contact the third gear driven gear 203 and the spline transition wheel 1 207; the spline sleeve 215 is located on the spline transition wheel 216 and the first gear driven gear 217 at the same time, realizing the interlocking of the two. At this time, the third gear drives the main speed shaft to rotate, the first gear and the second gear are idling, and the vehicle runs at the third gear speed four-wheel drive.

[0087] When the agricultural machinery vehicle needs to brake, the brake 222 is locked, and the main transmission shaft 202 is in a locked state and cannot rotate. No matter in any gear, power can not be further transmitted, and the subsequent components are in a braking state, so as to realize the braking of the agricultural machinery vehicle.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A durable high-load small agricultural vehicle transmission system, characterized in that: It includes a gearbox, a front drive axle, and a rear drive axle. The gearbox is connected to the front drive axle and the rear drive axle through transmission shafts respectively. The gearbox includes a gearbox housing, an input shaft, a main transmission shaft, an output shaft, and a speed shift fork assembly. A plurality of driving gears are fixedly connected to the input shaft. The main transmission shaft is provided with a plurality of driven gears rotatably meshed with the main transmission shaft, a plurality of transition gears fixedly connected with the main transmission shaft, and a first transmission gear. A connecting sleeve is movably connected to the transition gear. The connecting sleeve is used to fix the driven gear and the transition gear. A second transmission gear used to mesh with the first transmission gear is fixedly connected to the output shaft. The speed shift fork assembly is used to control the movement of the connecting sleeve. The shift fork assembly comprises a rocker arm assembly, a shift fork and a shift fork shaft. The shift fork is a cylindrical structure, and a through hole along the axis direction is provided at the center of the bottom surface thereof. The shift fork is also provided with shift fork feet of the same number as the connecting sleeve. The bottom of the shift fork feet is connected to the connecting groove of the connecting sleeve. The shift fork is movably sleeved on the shift fork shaft, and a plurality of gear stop points are provided at intervals on the shift fork shaft. The rocker arm assembly comprises a first rocker, two second rockers, two third rockers, a first connecting rod, and a second connecting rod, wherein the first end of the first rocker is hinged on the first fixing seat, the first end of the second rocker is hinged on the second fixing seat, the first fixing seat is located above the second fixing seat, and the hinge of the first end of the first rocker is located between the hinges of the first ends of the two second rockers; The two ends of the first connecting rod are respectively hinged to the first ends of the two third rockers, the second end of the first rocker is hinged to the center of the first connecting rod, the second ends of the two third rockers are respectively connected to the two ends of the second connecting rod, and the second ends of the two second rockers are respectively hinged to the same position of the middle section of a third rocker; wherein the distance between the hinges of the two ends of the second rocker is a, the vertical distance between the hinge of the first fixing seat and the hinge of the second fixing seat is b, and a=b; The second connecting rod is fixedly connected to the shift fork; wherein the first rocker arm or the second rocker arm is an active rod; The input shaft, main speed change shaft and output shaft are all installed in the speed change housing through bearings arranged on both sides of the gear parts. The main speed change shaft is located between the input shaft and the output shaft. One end of the input shaft extends out of the housing and is connected to the power input device, one end of the main speed change shaft extends out of the housing and is connected to the brake, and both ends of the output shaft extend out of the housing and are respectively connected to the front wheel axle and the rear wheel axle.

2. A durable high-load small agricultural vehicle transmission system according to claim 1, characterized in that: The hinge of the first end of the first rocker is located on the midline of the line between the hinges of the first ends of the two second rockers, and the hinges of the first sections of the second rockers are located at the same height.

3. A durable high-load small agricultural vehicle transmission system according to claim 1, characterized in that: The input shaft is provided with a first gear driving gear, a second gear driving gear, and a third gear driving gear in sequence, wherein the second gear driving gear and the first gear driving gear are integrally formed with the input shaft, and the third gear is fixedly connected to the input shaft through a spline structure. One side of the third gear is in contact with a retaining ring, and the other side thereof is in contact with one side of a bearing. The retaining ring is embedded in the groove of the input shaft, and an oil seal is provided on the other side of the bearing. One end of the input shaft is connected to one end of a spline sleeve through a spline structure, and the other end of the spline sleeve is connected to the power input shaft of the continuously variable transmission.

4. A durable high-load small agricultural vehicle transmission system according to claim 3, characterized in that: The main speed change shaft is provided with a bearing, a third gear driven gear, a first transition gear, a second gear driven gear, a first transmission gear, a second transition gear, a first gear driven gear spacer, a bearing, and a brake in sequence. The first gear driven gear, the second gear driven gear, and the third gear driven gear are respectively sleeved on the outside of the needle bearing, the needle bearing is sleeved on the outside of the bearing inner ring, and the bearing inner ring is sleeved on the outside of the main speed change shaft.

5. A durable high-load small agricultural vehicle transmission system according to claim 4, characterized in that: A thrust plate is provided between the first transmission gear and the inner ring of the bearing where the second gear driven gear is located. The thrust plate abuts against the inner ring of the bearing, the needle bearing and the second gear driven gear to limit the inner ring of the bearing, the needle bearing and the second gear driven gear.

6. A durable high-load small agricultural vehicle transmission system according to claim 4, characterized in that: The first transmission gear is fixedly connected to the main speed change shaft through a spline structure, and retaining rings are arranged on both sides of the first transmission gear, and the retaining rings are embedded in the clamping grooves on the main speed change shaft.

7. A durable high-load small agricultural vehicle transmission system according to claim 1, characterized in that: The driven gear includes a gear part and an external spline part. The gear part is used to mesh with the driving gear, and the external spline part is used to connect with the connecting sleeve. The connecting sleeve is a hollow structure with an internal spline structure on its inner wall. The outer side of the transition gear is provided with an external spline structure.

8. A durable high-load small agricultural vehicle transmission system according to claim 1, characterized in that: The output shaft is provided with a front spline connection seat, two bearings, an output gear, and a rear spline connection seat in sequence. The two bearings are provided with oil seals on one side close to the two ends of the output shaft. The front spline connection seat and the rear spline connection seat are respectively installed on the two ends of the output shaft through nuts and gaskets, and are respectively connected to the front wheel axle and the rear wheel axle. The output gear is fixedly connected to the output shaft through a spline structure.

9. A durable high-load small agricultural vehicle transmission system according to claim 1, characterized in that: The gear stop point is a first annular groove, the cross-section of the first annular groove is a trapezoid, the width of the groove mouth is greater than the width of the groove bottom, the outer arc surface of the shift fork shaft is provided with a first plurality of annular grooves, and a second annular groove with the fork axis as the center is provided on the outer side of the edge of the through hole on the bottom surface of the shift fork, a plurality of circular holes are provided on the inner side wall of the second annular groove close to the axis at intervals along the circumferential direction, a spherical card bead is movably provided in the circular hole, and a compression spring is provided between the card bead and the inner side wall of the second annular groove away from the shift fork axis.

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