An agricultural vehicle

Abstract

The present application belongs to the technical field of agricultural machinery equipment, and particularly relates to an agricultural vehicle, which comprises a multi-stage gear pair in a gearbox, a first output transmission shaft and a walking driving shaft, the first output transmission shaft is in transmission connection with a transplanting operation machine, and the walking driving shaft transmits power to rear wheels; the agricultural vehicle further comprises a tillage part input shaft, the tillage part input shaft outputs power of a power system to a connecting shaft, the connecting shaft is in speed reduction connection with a tillage part output shaft fixed at the rear of a vehicle body through a second speed reduction gear pair, and the tillage part output shaft is connectable with a tillage operation part. The first output transmission shaft and the walking driving shaft are in linkage rotation after output adjustment of a gearbox, and the tillage part output shaft is directly connected with a power system through a connecting shaft and a tillage part input shaft, so that the transmission structure of the operation machine is simplified, and various operation equipment can be used, thereby improving the use efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural machinery equipment, and particularly relates to an agricultural vehicle. BACKGROUND

[0002] The speed of rice transplanting or direct seeding is related to the walking speed of the walking part of the agricultural machine, and the faster the walking part, the faster the transplanting or direct seeding speed, and the slower the walking part, the slower the transplanting or direct seeding speed, and when the walking part stops, the transplanting or direct seeding work is not performed. When the agricultural machine is plowing, such as rotary plowing, a beater, and field leveling, the plowing part needs to keep running regardless of the speed of the walking part or whether the vehicle is stopped.

[0003] The connection between the existing agricultural vehicle and the transplanting part is generally that the transplanting part is hung on the rear mounting rack of the agricultural vehicle. When the transplanting part connector is installed, the gear box cover in the middle of the axle needs to be disassembled, and the gears on the transplanting part connector are engaged with the gears in the gear box for transmission connection. Therefore, the transplanting part is not only difficult to install, but also needs to be equipped with a matching gearbox. For high-speed rice transplanter, although there is a special connector for the transplanting part, the versatility is poor, and it is impossible to perform plowing and other operations. The existing multi-purpose agricultural machine connects different operation parts through a single transmission shaft, and needs to be equipped with a gearbox and a clutch on the operation part. The operation part can only work normally by being controlled by the control system separately arranged on the operation part, which is very inconvenient to operate. Moreover, the gearbox and other mechanical parts of the operation part are heavy in weight, high in design requirement, and prone to failure. In addition, the cost is relatively high when different transplanting or direct seeding operation parts are configured.

[0004] It can be seen that the existing agricultural vehicle system does not configure a structure that can connect and drive the continuous operation of the plowing part and output the linkage structure with the walking speed of the transplanting part. Therefore, a system that can output stable power continuously and output power in real time linkage with the walking speed of the agricultural vehicle makes the agricultural vehicle very convenient to mount different operation parts, and increases the utilization rate of the agricultural vehicle, which has become an urgent problem to be solved in the technical field. SUMMARY

[0005] The present application aims to solve at least one of the above problems in the prior art, and provides an agricultural vehicle. The transmission system of the agricultural vehicle can output the walking power of the agricultural vehicle, the driving of the transplanting part, and the driving of the plowing part with as few transmission structures as possible, realize the transmission of different power, be suitable for driving different operation parts, and make the agricultural vehicle be fully utilized to reduce the production cost of farmers.

[0006] The application provides an agricultural vehicle, characterized in that it comprises: a stepless hydraulic transmission which transmits power of a power system; an output shaft of the stepless hydraulic transmission is in transmission connection with a gearbox, and transmits power to a first output transmission shaft and a walking driving shaft after being adjusted by a plurality of gear pairs in the gearbox; the first output transmission shaft is in transmission connection with a planting operation machine; the walking driving shaft is in transmission connection with a rear wheel driving assembly installed in a rear axle gear box, and the rear wheel driving assembly transmits power to rear wheels; the agricultural vehicle further comprises a tillage part input shaft which transmits power of the power system to a connecting shaft, and the connecting shaft is in transmission connection with a tillage part output shaft fixed at the rear of a vehicle body after being decelerated by a second gear pair; and the tillage part output shaft is connectable with a tillage operation part.

[0007] The first output transmission shaft and the walking driving shaft are adjusted by the gearbox and then output in linkage, so that the planting operation machine is associated with the walking speed, and the speed of the planting operation and the walking operation can be adjusted respectively, and a gearbox needs not to be arranged on the planting operation machine. The tillage part output shaft is directly connected with the power system through the connecting shaft and the tillage part input shaft, and the power output by the tillage part output shaft needs not to pass through the plurality of gear pairs, so that the tillage part output shaft can continuously work without being affected by whether the agricultural vehicle is walking or the walking speed, and the tillage part output shaft is fixed at the rear of the vehicle body and is connectable with the tillage operation machine, so that the tillage part output shaft is more convenient and stable in connection with the tillage operation machine, and can output larger torque and speed. The second gear pair reduces the speed to a suitable range, so that the driven operation machine is wider, and the transmission structure of the operation machine can be simplified.

[0008] Further, the second gear pair is installed in the rear axle gear box, the tillage part output shaft and the connecting shaft are in transmission connection through the second gear pair, and the second gear pair can reduce the torque acting on the connecting shaft, so that the connecting shaft works more stably, the second gear pair has a better working environment and is more stable and has a longer service life, the improvement of the agricultural vehicle is relatively small, and the manufacturing cost and the application cost are relatively low.

[0009] Further, the connecting shaft comprises shaft one, shaft two and shaft three, universal joints are arranged between the shaft one and the shaft two and / or between the shaft two and the shaft three, the second gear pair comprises a second gear set on one end of the shaft three, and a third gear set on one end of the tillage part output shaft, the second gear and the third gear are in engagement, and the number of teeth of the second gear is less than that of the third gear. According to the structure, the connecting shaft is adjusted through the universal joints, the damage of the connecting shaft caused by the position change or vibration between the two fixed ends can be eliminated, and the third gear is fixed on one end of the tillage part output shaft, so that the connecting operation machine is balanced in force.

[0010] Further, the first reduction gear pair is arranged between the tillage part input shaft and the connecting shaft, and comprises a gear shaft and a second reduction gear, the gear shaft is axially slidably sleeved on the tillage part input shaft, and comprises a clutch, a shift fork for actuating the clutch, and the clutch is used to disconnect or connect the gear shaft and the second reduction gear. Through the cooperation of the first and second reduction gear pairs, the transmission system can adjust the corresponding rotating speed according to the power system and the working power requirement of the working machine, the adjustment range is wide, the gear assembly arranged on the working machine is reduced, and the cost and weight of the working machine are reduced.

[0011] Further, the gear shaft and the second reduction gear are bevel gears, and further comprising a steering gear set, the steering gear set comprises a fourth transmission shaft, a fifth bevel gear and a sixth bevel gear, the fourth transmission shaft is fixed at one end with the second reduction gear and at the other end with the fifth bevel gear, the sixth bevel gear is fixed at one end of the connecting shaft, and the fifth bevel gear and the sixth bevel gear are in meshing engagement. Through the separate arrangement of the steering gear set, the direction and angle of the connecting shaft can be controlled, and the interference phenomenon between the driving shaft of the walking part and the driving shaft of the planting part can be avoided. According to the structure, through the cooperation of the bevel gears, not only the speed reduction can be realized, but also the transmission direction can be converted, the power arranged transversely on the tillage part input shaft is transmitted to the connecting shaft arranged longitudinally, and the connecting shaft is connected with the transmission structure in the rear axle gear box. The arrangement of the fourth shaft realizes the spatial arrangement of the connecting shaft and the tillage part input shaft at different levels, bearings are arranged, and the fixing of the connecting shaft is more stable.

[0012] Further, a reduction box is arranged, the reduction box is fixedly connected with the transmission box, the first reduction gear pair and the steering gear set are arranged in the reduction box, and the clutch is arranged in the transmission box. According to the structure, through the arrangement of the reduction box, the transmission gears of the tillage machine are arranged separately, replacement and maintenance are facilitated, and transmission ratio gears with different transmission ratios can be arranged. The clutch can control whether the working machine works, and the safety risk caused by the continuous working of the working machine is avoided. The clutch is arranged on the tillage part input shaft, the driver of the agricultural vehicle can operate the clutch, the clutch is directly disconnected from the source, and the wear between the gear pairs is reduced. Since the clutch generates heat during work, the clutch is arranged in the reduction box, so that the hydraulic oil in the transmission box can be effectively cooled and lubricated to reduce wear.

[0013] Further, the transmission box comprises a left box body, a right box body, a right box cover and a left box bearing seat which are connected in sequence, the left box body is fixedly connected with the stepless hydraulic transmission, the multi-stage gear pair is arranged in the left box body and the right box body, and the first reduction gear pair is arranged in the right box cover.

[0014] According to the structure, the right box cover provides installation space for the first reduction gear pair, and the first reduction gear pair is taken as a relatively independent part, so that the mechanical requirements of the driving structure of the tillage machine are met. The first reduction gear pair and the multi-stage gear pair are arranged in different working spaces, the working environment requirement of the first reduction gear pair is lower, and the cost of the gear box is reduced.

[0015] Further, the transmission further comprises a left box bearing seat, one end of the tillage part input shaft is arranged to extend out of the left box bearing seat and is connected with the power system in transmission, and at least one bearing is arranged on the left box bearing seat, the transmission left box body, the transmission right box body and the transmission right box cover, and is used for supporting the tillage part input shaft.

[0016] According to the structure, the bearings arranged on the left box bearing seat, the left box body, the right box body and the right box cover can support the tillage part input shaft more stably and uniformly, and the bearings are fixed on different structures, so that the effect on a single box body is avoided.

[0017] Further, the multi-stage gear pair comprises a first transmission shaft connected with the output shaft, a second transmission shaft and a third transmission shaft arranged in sequence and in parallel with the first transmission shaft, the first transmission shaft is fixed with a first high-low gear set, the second transmission shaft is slidably connected with a first variable speed gear set and is fixedly connected with a second high-low speed gear set, the third transmission shaft is slidably connected with a second variable speed gear set, the first high-low gear set is engaged with the first variable speed gear set, the second high-low speed gear set is engaged with the second variable speed gear set, and the third transmission shaft transmits power to the first output transmission shaft. Through the multi-stage gear pair, different speed ratios of walking and planting can be realized under the condition of ensuring linkage with walking, the planting spacing is convenient to adjust, different mounted machines can be used, and the applicability is wide.

[0018] Further, the walking driving shaft is in transmission connection with a rear wheel driving assembly fixed in the rear axle gear box, the rear wheel driving assembly comprises a steering gear pair, a driving cross shaft and driving gear sets arranged at two ends of the driving cross shaft respectively, further, the steering gear pair comprises a seventh bevel gear fixed in the middle of the driving cross shaft and an eighth bevel gear fixed at one end of the walking driving shaft, each of the two ends of the driving cross shaft is provided with a spline sleeve and a spline shaft matched with the spline sleeve, a safety clutch is arranged on the spline sleeve and the spline shaft, the driving gear set comprises a driving gear one fixed on the spline shaft, the driving gear one is engaged with a driving gear two arranged on a driving gear shaft, the driving gear shaft is engaged with a driving gear three fixed at one end of a rear axle wheel shaft, and the driving gear set reduces and transmits the rotating speed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of an agricultural vehicle;

[0020] Figure 2Fig. 1 is a schematic view of the vehicle body hanging on the interpolation operation department;

[0021] Figure 3 Fig. 2 is a schematic view of the right side of the agricultural vehicle transmission system and power system;

[0022] Figure 4 Fig. 3 is a schematic view of the left side of the agricultural vehicle transmission system and power system;

[0023] Figure 5 Fig. 4 is a schematic view of the main gear transmission shaft transmission cooperation of the transmission system;

[0024] Figure 6 Fig. 5 is a schematic view of the rear drive assembly;

[0025] Figure 7 Fig. 6 is a schematic view of the rear side of the transmission system and power system;

[0026] Figure 8 Fig. 7 is a schematic view of the multi-stage gear pair without the walking part and the corresponding gear and reduction gear pair structure;

[0027] Figure 9 Fig. 8 is an enlarged schematic view of the interpolation part of the multi-stage gear pair;

[0028] Figure 10 Fig. 9 is a schematic view of the cross-sectional structure of the transmission box;

[0029] Figure 11 Fig. 10 is a schematic view of the structure of the transmission box disassembled to the right cover;

[0030] Figure 12 Fig. 11 is a schematic view of the cross-sectional structure of the rear axle gear box;

[0031] Figure 13 Fig. 12 is a second arrangement of the transmission system;

[0032] Figure 14 Fig. 13 is a third arrangement of the transmission system;

[0033] Figure 15 Fig. 14 is a fourth arrangement of the transmission system.

[0034] In the figure, the following are marked:

[0035] 1-vehicle body, 10-chassis, 20-traveling system, 30-power system, 40-transmission system; 101-front wheel, 102-rear wheel, 103-hanging part; 3-interpolation part, 302-main pulley, 303-belt;

[0036] 401-infinitely variable hydraulic transmission, 402-first driven pulley, 403-input shaft, 405-output shaft;

[0037] 41 - gearbox, 4101 - left box body, 4102 - right box body, 4103 - right box cover, 4104 - left box bearing seat, 411 - multi-stage gear pair, 412 - first output transmission shaft, 413 - transplanting part output end, 414 - walking driving shaft, 416 - first high-low gear set, 417 - first gear shifting gear set, 418 - second high-low gear set, 419 - second gear shifting gear set, 4110 - first bevel gear, 4111 - second bevel gear, 4112 - first transmission shaft, 4113 - second transmission shaft, 4114 - third transmission shaft, 4121 - first joint, 4122 - middle shaft, 4123 - second joint;

[0038] 42 - reduction gearbox, 421 - connecting shaft, 4211 - shaft one, 4212 - shaft two, 4213 - shaft three, 422 - tillage part input shaft, 423 - second driven pulley, 424 - clutch, 4241 - shift fork, 425 - tension pulley, 426 - steering gear set, 4261 - fourth transmission shaft, 4263 - fifth bevel gear, 4264 - sixth bevel gear, 427 - universal joint, 4271 - first universal joint, 4272 - second universal joint, 428 - bearing;

[0039] 43 - first reduction gear pair, 431 - gear shaft, 432 - first reduction gear, 44 - rear axle gear box, 45 - second reduction gear pair, 451 - second reduction gear, 452 - third reduction gear, 46 - tillage part output shaft;

[0040] 5 - rear wheel driving assembly, 51 - steering gear pair, 511 - seventh bevel gear, 512 - eighth bevel gear, 52 - driving cross shaft, 521 - spline sleeve, 522 - spline shaft, 53 - driving gear set, 531 - driving gear one, 532 - driving gear shaft, 533 - driving gear two, 534 - driving gear three, 54 - safety clutch, 55 - rear axle wheel shaft. Specific embodiments

[0041] In order to further understand the content of the present application, the present application will be described in detail in conjunction with the drawings and examples. It should be understood that the examples are only used to explain the present application and are not limited.

[0042] As shown in Figures 1-3 An agricultural vehicle, a vehicle body 1 comprising a chassis 10, a driving system 20, a power system 30, a transmission system 40 and the like installed on the chassis 10. The chassis 10 is installed with front wheels 101 and rear wheels 102, and a hitch part 103 is installed at the rear, which can be used to carry tillage, planting, management, harvesting and auxiliary work machines. Among them, the tillage work part that can be carried by the agricultural vehicle mainly includes rotary tiller, paddy field beating machine, flat field machine, etc. The transplanting work part 3 mainly includes transplanter and direct seeding machine.

[0043] As shown in Figure 3 the power system 30, in the embodiment, the power system 30 includes an engine, the engine output end is installed with a main pulley 302, the main pulley 302 and the first driven pulley 402 at one end of the transmission system 40 are connected through a belt 303. In some embodiments, the transmission connection can have various forms, including chain transmission, gear transmission and the like. Figure 15 direct transmission and the like.

[0044] As shown in Figures 3-5 the transmission system 40 includes a stepless hydraulic transmission 401, a gearbox 41 and a reduction gearbox 42. The stepless hydraulic transmission 401 includes an input shaft 403 and an output shaft 405. The first driven pulley 402 is fixed on the input shaft 403, and the first driven pulley 402 and the input shaft 403 are connected through the key groove and the flat key. The output shaft 405 transmits power to the gearbox 41 through the shaft or the gear.

[0045] The gearbox 41 is fixed on the right side of the stepless hydraulic transmission 401, and a plurality of gear pairs 411 are installed in the gearbox 41. The first output transmission shaft 412 and the walking drive shaft 414 are output through the plurality of gear pairs 411. The plurality of gear pairs 411 are rotatably connected with the output shaft 405. The first output transmission shaft 412 can be connected with the working part 3, and the walking drive shaft 414 is connected with the walking gear of the rear axle to drive the wheels of the agricultural vehicle to walk. The power input end of the driving working part is the working part input shaft 422, which is connected with the power system 30, in the embodiment, the power system 30 includes an engine, the engine output end is installed with a main pulley 302, the main pulley 302 and the second driven pulley 423 at one end of the working part input shaft 422 are connected through a belt 303. In some embodiments, the transmission connection can have various forms, including chain transmission, gear transmission and the like.

[0046] The first reduction gear pair 43 is installed in the reduction box 42, and is in transmission connection with the tillage part input shaft 422. The first reduction gear pair 43 is connected with a connecting shaft 421 at the output side. The other end of the connecting shaft 421 is provided with a second reduction gear pair 45. The second reduction gear pair 45 is installed in the rear axle gear box 44. The rear axle gear box 44 is provided with a tillage part output shaft 46 at the rear. The tillage part output shaft 46 is connected with the second reduction gear pair 45 at the front end. The rear end of the tillage output shaft 46 is installed with a universal joint. The universal joint is connected with the transmission of the mounted working machine. In some embodiments, the second reduction gear pair 45 can be fixed in a gear box separately arranged at the rear of the agricultural vehicle. The second reduction gear pair 45 is arranged in the rear axle gear box 44, which can make the least change to the existing walking part, can greatly save the cost, and has high stability, and is convenient for lubrication, maintenance and replacement. Figure 8 As shown in FIG. 11, the second reduction gear pair 45 includes a third reduction gear 452 fixed at one end of the tillage part output shaft 46, and a third reduction gear 451 fixed at one end of the connecting shaft 421. The second reduction gear 451 and the third reduction gear are in meshing connection. The number of teeth of the second reduction gear 451 is less than the number of teeth of the third reduction gear 452, so as to form a speed reduction transmission. The first reduction gear pair 43 and the second reduction gear pair 45 form a two-stage speed reduction of the tillage working power output, which is convenient for adjusting and selecting a more appropriate speed reduction ratio.

[0047] The reduction box 42 is in transmission connection with the power system 30 through the tillage part input shaft 422. The output end of the reduction box 42 is connected with the connecting shaft 421. The power of the power system 30 is output to drive the tillage machine working through at least one stage of speed reduction. The tillage working part can directly obtain stable power from the engine. The design is stable, occupies small space, and is very convenient to install. The walking driving shaft 414 drives the rear wheels. The transplanting driving shaft is in synchronous operation with the walking driving shaft, and drives the rice transplanter, the seeder and other machines which need to match the walking speed of the agricultural vehicle. When the tillage part rotary tillage machine, the paddy field beating machine and the field leveling machine work, high power and uninterrupted work are needed, so as to avoid the adverse effects of the starting, turning and bumping of the agricultural vehicle on the output power of the tillage part, and to avoid the influence on the tillage part working effect.

[0048] As shown in FIG. 11, Figure 5As shown in Figures 6 and 12, the output of the continuously variable transmission (CVT) transmits power to the insert drive shaft via a multi-stage gear pair. The travel drive shaft then transmits power to the rear axle gearbox. The travel drive shaft 414 is connected to the rear wheel drive assembly 5, which is fixed within the rear axle gearbox 44. Splined sleeves and splined shafts can be fitted at both ends of the travel drive shaft 414 to facilitate the manufacturing and assembly of a longer travel drive shaft 414. The rear wheel drive assembly 5 includes a steering gear pair 51, a drive shaft 52, and drive gear sets 53 respectively installed at both ends of the drive shaft 52. Furthermore, the steering gear pair 51 includes a seventh bevel gear 511 fixed in the middle of the drive shaft 52 and an eighth bevel gear 512 fixed at the rear end of the drive shaft 414. Each end of the drive shaft 52 is equipped with a splined sleeve 521 and a splined shaft 522 that mates with the splined sleeve 521. A safety clutch 54 is mounted on the splined sleeve 521 and the splined shaft 522. The drive gear set 53 includes a first drive gear 531 fixed on the splined shaft 522, which meshes with a second drive gear 533 fixed on the drive gear shaft 532. The drive gear shaft 532 meshes with a third drive gear 534 fixed at one end of the rear axle wheel axle 55. The drive gear set reduces speed and transmits rotational speed. All the aforementioned shafts are mounted in the rear axle housing via bearings. The rear wheels are mounted on the rear axle wheel axles.

[0049] During insertion drive: When the first pulley 402 rotates, the input shaft of the continuously variable hydraulic transmission 401 connected to it rotates synchronously. The output shaft 405 is connected to the multi-stage gear pair in the gearbox 41, and then the gearbox 41 outputs the first output drive shaft 412 and the travel drive shaft 414. The insertion speed and the travel speed are correlated to realize the synchronous operation of the travel system and the first output transmission device.

[0050] During tillage operation: When the second pulley 423 rotates, the tillage input shaft 422 connected to it rotates synchronously. The tillage input shaft 422 drives the tillage machinery through the clutch 424, reduction gear pair, steering gear pair 426 and connecting shaft 421.

[0051] like Figure 3 As shown in Figures 4.7-11, the gearbox 41 includes a left housing 4101, a right housing 4102, and a right cover 4103. The terms "left," "right," "front," and "rear" refer to... Figure 7The orientation of the structure relative to the observer indicates relative position relationship rather than absolute. The left box 4101 is connected with the output side of the CVT 401, and the gear or transmission shaft at the output end of the CVT 401 is in transmission connection with the multi-stage gear pair 411 located in the left box 4101 and / or the right box 4102. The multi-stage gear pair 411 includes a first transmission shaft 4112 connected with one end of the power output shaft 405, and the first high-low gear set 416 is fixed on the first transmission shaft 4112. The first transmission shaft 4112 is provided with the first transmission gear set 417, and the first transmission gear set 417 is in sliding connection with the first high-low gear set 416. The second transmission shaft 4113 is fixed with the second high-low gear set 418, and the third transmission shaft 4114 is in sliding connection with the second transmission gear set 419. The second transmission gear set 419 is in sliding connection with the second high-low gear set 418. The first high-low gear set 416 and the second high-low gear set 418 can be respectively composed of two gears with different tooth numbers. The first and second transmission gear sets have gears matched therewith to achieve different transmission ratios.

[0052] The third transmission shaft 4114 is fixed with the first bevel gear 4110 at the end away from the CVT 401, and the second bevel gear 4111 is fixed at the end of the first output transmission shaft 412 and in meshing connection with the first bevel gear 4110. The rotation direction of the rotating shaft is turned by 90 degrees through the cooperation of the two bevel gears, wherein the 90 degrees is not an absolute angle, and there can be a certain error or tolerance range. The first output transmission shaft 412 includes a first joint 4121, a middle shaft 4122, and a second joint 4123. The first joint 4121 and the middle shaft 4122 are provided with universal joints at one end, and the other end of the middle shaft 4122 is connected with the universal joint. The universal joint outputs a plug-in part. The first output transmission shaft 412 transmits rotary power to the tail of the vehicle body 1 and is connected with the power joint of the plug-in part 3 mounted on the hitching part 103.

[0053] The right box cover 4103 is located away from the CVT 401, and the space formed by the right box cover 4103 and the right side wall of the right box 4102 can be provided with the first reduction gear pair 43. Therefore, in this embodiment, the reduction box 42 is the box space formed by the right box cover 4103 and the right side wall of the right box 4102. Of course, in some embodiments, the reduction box 42 can also be separately provided.

[0054] As Figure 7As shown in FIG. 10, the left side of the left box body 4101 is also provided with a left box bearing seat 4104, which is parallel to the stepless hydraulic transmission 401 and located on the side of the stepless hydraulic transmission 401 close to the power system 30. The left box bearing seat 4104 is provided with a tillage part input shaft 422, and the input end of the tillage part input shaft 422 is fixedly provided with a second driven pulley 423, which is connected with the tillage part input shaft 422 through a key groove and a key. The main pulley 302, the first driven pulley 402 and the second driven pulley 423 are connected through a belt 303. In some embodiments, as shown in FIG. Figures 10-11 , the first driven pulley 402 and the second driven pulley 423 can also be connected with the main pulley 302 through multiple belts, directly or indirectly. When the power system 30 operates, the main pulley 302 synchronously operates, and through the belt transmission, the first driven pulley 402 and the second driven pulley 423 also synchronously operate.

[0055] When the tillage drive operates: the second driven pulley 423 operates, and the tillage part input shaft 422 connected with the second driven pulley 423 synchronously operates. The tillage part input shaft 422 is transmitted through the clutch 424, the speed reduction gear pair, the steering gear pair 426 and the connecting shaft 421, and specifically, the left box bearing seat 4104, the left box body 4101 of the gearbox, the right box body 4102 of the gearbox and the right box cover 4103 of the gearbox are each provided with a bearing for supporting the tillage part input shaft 422. As shown in FIG. Figure 7 , the speed reduction gear pair is located at the joint of the right box body 4102 and the right box cover 4103 or in the right box cover 4103.

[0056] The tillage part input shaft 422 is substantially parallel to the stepless hydraulic transmission 401 and the multi-stage gear pair 411 as a whole, and the parallelism is that the setting direction of the multi-stage gear pair 411 is substantially parallel to the transmission direction of the first to third transmission shafts, and the structure is substantially parallel. The tillage part input shaft 22 is transversely connected to the left box body 4101, the right box body 4102, the right box cover 4103, the left box bearing seat 4104 and the first reduction gear pair 43, the first reduction gear pair 43 includes a gear shaft 431 and a second reduction gear 432, the gear shaft 431 is axially slidably sleeved on the tillage part input shaft 422, and the tillage part input shaft 422 includes a clutch 424 arranged on the gear shaft 431, a shift fork 4241 for shifting the clutch 424, and the clutch 424 is used to disconnect or connect the transmission connection between the gear shaft 431 and the second reduction gear 432. The clutch 424 is mainly used to disconnect the torque transmission of the tillage part input shaft 422 when not tilling, so as to avoid the idling of the tillage part output shaft. In order to improve the tightness of the second driven pulley 423 and the belt 303, a tensioner 425 is arranged between the second driven pulley 423 and the main pulley 302 or between the second driven pulley 423 and the first driven pulley 402, and the tensioner 425 is matched on the outer side of the belt, that is, the tensioner 425 and the second driven pulley 423 are located on the upper and lower sides of the same side of the belt. The tensioner 425 has potential energy moving towards the belt, so that the tensioner 425 is tightly attached to the belt and ensures that the belt is taut.

[0057] The steering gear set 426 is also installed in the right box cover 4103 or the separate reduction gear box 42. The first reduction gear pair 43 includes a gear shaft 431 and a first reduction gear 432 which are connected to the output end of the clutch 424. The steering gear set 426 includes a fourth transmission shaft 4261, a fifth bevel gear 4263 and a sixth bevel gear 4264. The gear shaft 431 and the first reduction gear 432 are bevel gears. The first reduction gear 432 is fixed to one end of the fourth transmission shaft 4261. The fifth bevel gear 4263 is fixed to the other end of the fourth transmission shaft 4261. The fifth bevel gear 4263 is engaged with the sixth bevel gear 4264. The gear shaft 431 is sleeved on the input shaft 422 of the tillage part with a gap. The gear shaft 431 is not tightly fitted on the input shaft 422. The gear shaft 431 is provided with the clutch 424 and a clutch fork 4241 on the power input and output side of the right side of the gear shaft 431. The clutch 424 is installed in the transmission box so that the friction plate of the clutch 424 can be effectively cooled by the hydraulic oil in the transmission box. The clutch fork 4241 can separate and combine the clutch 424. When the clutch 424 is separated, the gear shaft 431 does not rotate. When the clutch 424 is combined, the gear shaft 431 rotates synchronously with the input shaft 422 of the tillage part. The number of teeth of the bevel gear on the gear shaft 431 is less than the number of teeth of the first reduction gear 432. In some embodiments, the bevel gear on the gear shaft 431 and the first reduction gear 432 can be straight gears or bevel gears. When they are bevel gears, they can be part of the steering gear set to further increase the steering effect. The clutch 424 is installed in the transmission box 41. The fourth transmission shaft 4261 can be a spline shaft which is fixed in the reduction gear box 42 by two bearings 428. The power of the second driven pulley 423 is converted into the required direction of power by the steering gear set 426, which further facilitates the transmission of the power of the front-mounted engine 301 to the tillage part located at the rear end of the vehicle body 1 through the transmission shaft and makes the installation space of the second output transmission device 42 more flexible.

[0058] As shown in Figures 10-11 , the first reduction gear pair 43 is arranged between the steering gear set 426 and the clutch 424 to form the first stage reduction. The first reduction gear pair 43 is arranged in the right box cover 4103. The reduction ratio of the first reduction gear pair 43 in the reduction gear box is very small. Its main function is to cooperate with the steering gear set 426 to realize steering. Therefore, the second steering gear pair 45 is arranged to realize a larger reduction ratio. Of course, in some embodiments, a separate reduction gear box is arranged. The reduction gear pair and the bevel gear pair are arranged in the reduction gear box. The reduction gear box is fixed to the right side of the transmission box. The reduction gear box or the right box cover of the transmission box is separately arranged, which facilitates the manufacturing of the mold and the assembly.

[0059] As shown in Figure 8As shown, the connecting shaft 421 is provided with a universal joint 427, which in this embodiment includes a first universal joint 4271 and a second universal joint 4272. The connecting shaft 421 is divided into three sections, namely shaft one 4211, shaft two 4212 and shaft three 4213. The shaft one 4211 is supported by three bearings on the right cover 4103 of the gearbox and has a sixth bevel gear 4264 at one end. The shaft three 4213 is supported by a bearing in the rear axle gear box 44 and is connected to the second reduction gear pair 45. The second reduction gear pair 45 includes a second reduction gear 451 fixed on the shaft three 4213 and a third reduction gear 452 of the output end 429. The third reduction gear 452 has more teeth than the second reduction gear 451, and the two gears are engaged to adjust the output speed. The tillage part output shaft 46 is provided with a joint that matches the tillage part. The cooperation of the two universal joints 427 enables the connecting shaft 421 to transmit torque over a long distance and adjust the angle of the drive shaft, which is suitable for the tillage part to start, stop and bounce, etc. In this patent, the power of the belt is transmitted to the working machine device through the cooperation of gears and shafts, and the mechanical work is stable and precise.

[0060] As shown in Figure 11 and Figure 12 The tillage part output shaft 46 is mounted in the rear axle gear box 44 and the rear axle gear box 44 cover through two bearings. One end of the tillage part output shaft 46 is provided with a third reduction gear 452, which forms a gear pair with the second reduction gear 451. Figure 12 The output end of the tillage part output shaft 46 is connected to a universal joint, which is connected to the input shaft of the mounted working equipment. Specific embodiments

[0061] As shown in Figure 13 The difference between this embodiment and embodiment one is that the input shaft 403 of the infinitely variable hydraulic transmission 401 shares an input shaft with the tillage part input shaft 422, i.e. the tillage part input shaft 422 passes through one end of the infinitely variable hydraulic transmission 401 and is provided with a first belt pulley 402 connected to the main belt pulley 302 of the engine, and the other end is connected to the clutch 424 located in the gearbox. The tillage part input shaft 422 simultaneously transmits power to the infinitely variable hydraulic transmission 401 and the tillage drive shaft. This can reduce the number of belt pulleys and drive shafts, making the transmission system more compact and stable. Of course, the tillage part input shaft 422 can not be a whole shaft that passes through the infinitely variable hydraulic transmission 401. For example, the infinitely variable hydraulic transmission 401 has two output shafts: one is the first output shaft, which does not have a speed change function and is part of the tillage part input shaft 422 or a transmission shaft of the infinitely variable hydraulic transmission 401, i.e. as long as the transmission shaft of the existing infinitely variable hydraulic transmission 401 extends out of the right end of the infinitely variable hydraulic transmission 401. The second is the first variable shaft, which has the same structure as the existing variable structure and has a speed change function, i.e. the output shaft 405.

[0062] Insertion drive route: When the engine is running, the continuously variable hydraulic transmission 401 also operates synchronously. The transmission shaft of the continuously variable hydraulic transmission 401, i.e., the output shaft 405, is connected to the gearbox 41, and the gearbox 41 outputs the insertion drive shaft.

[0063] Tillage drive route: When the engine is running, the continuously variable hydraulic transmission 401 also operates synchronously. The first output shaft of the continuously variable hydraulic transmission 401 can be regarded as the connection between the tillage input shaft 422 and the first reduction gear pair 43, and outputs the tillage drive shaft after reduction. Specific Implementation

[0064] like Figure 15 As shown, this embodiment differs from embodiments one and two in that the engine's shaft is directly connected to the input shaft of the continuously variable hydraulic transmission 401. The engine is vertically mounted, and its crankshaft serves as the power output end, either directly or after adjustment. The engine's output shaft is connected to the continuously variable hydraulic transmission HST input shaft via a spline sleeve. The continuously variable hydraulic transmission 401 outputs two shafts: one is an output shaft, which does not function as a speed changer; the other is a speed changer shaft, which performs the speed changer function. The clutch 424 and the first reduction gear pair 43 can both be housed within the transmission 41. Furthermore, due to the vertical mounting of the engine, the power output and the tillage unit's output shaft are in the same direction, eliminating the need for a steering gear set to change the output power direction; a reduction gear pair is sufficient after the clutch. This simplifies the transmission process and eliminates the need for a separate reduction gearbox.

[0065] Insert drive route: When the engine is running, the continuously variable transmission (CVT) also operates synchronously. The HST transmission shaft is connected to the gearbox, and the gearbox output insert drive shaft.

[0066] Tillage drive route: When the engine is running, the continuously variable transmission (CVT) also operates synchronously. The output shaft of the CVT is connected to the reduction gear, and after reduction, the output is sent to the tillage drive shaft. Specific Implementation

[0067] like Figure 14 As shown, the difference between this embodiment and Embodiment 1 is that the main pulley 302 has two grooves, which are respectively connected to the first driven pulley 402 and the second driven pulley 423 via belts 303 and 304.

[0068] Insertion drive route: When the engine is running, the continuously variable hydraulic transmission 401 also operates synchronously. The transmission shaft of the continuously variable hydraulic transmission 401, i.e., the output shaft 405, is connected to the gearbox 41, and the gearbox 41 outputs the insertion drive shaft.

[0069] Tillage drive route: When the engine is running, the tillage unit input shaft 422 also runs synchronously, and after deceleration, it outputs the tillage drive shaft.

[0070] The bearing, the clamp, the bearing seat and the like are not limited in the embodiments of the present application, and all belong to the conventional matching mode in the mechanical setting. The gears in the patent are all general standard gears, which can be straight gears, helical gears, bevel gears and the like, and can transmit torque and rotational speed. The "left", "right", "front" and "rear" in the patent are for simplifying the description, and belong to relative positions. According to the overall power layout, the position relationship can be correspondingly adjusted. The "first", "second" or "one", "two" and the like in the present application are not limited to the order of the structure, nor the number, but only the differentiation of the nouns.

[0071] The above description of the present application and its embodiments is illustrative, and is not limited. The embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above description, and designs a similar structure and an embodiment without departing from the purpose of the present application, it should belong to the protection scope of the present application.

Claims

1. An agricultural vehicle, characterized in that, include: A continuously variable hydraulic transmission (401) transmits power from the power system (30); the output shaft (405) of the continuously variable hydraulic transmission (401) is connected to the gearbox (41) and outputs power to the first output drive shaft (412) and the walking drive shaft (414) after adjustment by the multi-stage gear pair (411) in the gearbox (41). The first output drive shaft (412) is connected to the planting machinery, and the walking drive shaft (414) is connected to the rear wheel drive assembly (5) installed in the rear axle gearbox (44). The rear wheel drive assembly (5) transmits power to the rear wheels; including a tillage input shaft (422), the tillage input shaft (422) outputs power from the power system (30) to the connecting shaft (421). The connecting shaft (421) is decelerated by the second reduction gear pair (45) and connected to the tillage output shaft (46) fixed at the rear of the vehicle body. The tillage output shaft (46) can be connected to the tillage operation unit; The rear axle gearbox (44) is equipped with a second reduction gear pair (45), and the tillage unit output shaft (46) and connecting shaft (421) are connected by the second reduction gear pair (45). The multi-stage gear pair (411) includes a first drive shaft (4112) connected to the output shaft (405), a second drive shaft (4113) and a third drive shaft (4114) arranged parallel to and sequentially on the first drive shaft (4112). A first high-low gear set (416) is fixed on the first drive shaft (4112). A first variable speed gear set (417) is slidably connected to the second drive shaft (4113) and a second high-low speed gear set (418) is fixedly connected to it. A second variable speed gear set (419) is slidably connected to the third drive shaft (4114). The first high-low gear set (416) and the first variable speed gear set (417) mesh. The second high-low speed gear set (418) and the second variable speed gear set (419) mesh. The third drive shaft (4114) transmits power to the first output drive shaft (412).

2. The agricultural vehicle according to claim 1, characterized in that, The connecting shaft (421) includes shaft one (4211), shaft two (4212) and shaft three (4213). A universal joint is provided between shaft one (4211) and shaft two (4212) or / and between shaft two (4212) and shaft three (4213). The second reduction gear pair (45) includes a second reduction gear (451) sleeved on one end of shaft three (4213) and a third reduction gear (452) sleeved on one end of the output shaft (46) of the tillage section. The second reduction gear (451) and the third reduction gear (452) mesh. The number of teeth of the second reduction gear (451) is less than the number of teeth of the third reduction gear (452).

3. The agricultural vehicle according to claim 1 or 2, characterized in that, A first reduction gear pair (43) is provided between the tillage unit input shaft (422) and the connecting shaft (421). The first reduction gear pair (43) includes a gear shaft (431) and a second reduction gear (432). The gear shaft (431) is axially slidably sleeved on the tillage unit input shaft (422) and includes a clutch (424) provided on the gear shaft (431) and a shift fork (4241) for actuating the clutch (424). The clutch (424) is used to disconnect or connect the transmission between the gear shaft (431) and the second reduction gear (432).

4. The agricultural vehicle according to claim 3, characterized in that, The gear shaft (431) and the second reduction gear (432) are bevel gears, and the gear set (426) is also included. The gear set (426) includes a fourth transmission shaft (4261), a fifth bevel gear (4263) and a sixth bevel gear (4264). The second reduction gear (432) is fixed at one end of the fourth transmission shaft (4261), and the fifth bevel gear (4263) is fixed at the other end. The sixth bevel gear (4264) is fixed to one end of the connecting shaft (421), and the fifth bevel gear (4263) and the sixth bevel gear (4264) mesh.

5. The agricultural vehicle according to claim 4, characterized in that, The gearbox (42) is fixedly connected to the gearbox (41), the first reduction gear pair (43) and the steering gear set (426) are installed in the gearbox (42), and the clutch (424) is located in the gearbox (41).

6. The agricultural vehicle according to claim 3, characterized in that, The gearbox (41) includes a left housing (4101), a right housing (4102), a right housing cover (4103), and a left housing bearing seat (4104) connected in sequence. The left housing (4101) is fixedly connected to the continuously variable transmission (401). The multi-stage gear pair (411) is disposed in the left housing (4101) and the right housing (4102), and the first reduction gear pair (43) is disposed in the right housing cover (4103).

7. The agricultural vehicle according to claim 6, characterized in that, The gearbox (41) also includes a left gearbox bearing housing (4104), one end of which extends out of the left gearbox bearing housing (4104) and is connected to the power system (30) for transmission. The left gearbox bearing housing (4104), the left gearbox body (4101), the right gearbox body (4102), and the right gearbox cover (4103) each have at least one bearing for supporting the tillage input shaft (422).

8. The agricultural vehicle according to any one of claims 1-2, 4-7, characterized in that, The drive shaft (414) is connected to the rear wheel drive assembly (5) fixed in the rear axle gearbox (44). The rear wheel drive assembly (5) includes a steering gear pair (51), a drive shaft (52), and drive gear sets (53) respectively provided at both ends of the drive shaft (52). The steering gear pair (51) includes a seventh bevel gear (511) fixed in the middle of the drive shaft (52) and an eighth bevel gear (512) fixed at one end of the drive shaft (414). A spline sleeve (5) is installed at each end of the drive shaft (52). 21) A splined shaft (522) that mates with a splined sleeve (521) and a safety clutch (54) are mounted on the splined sleeve (521) and the splined shaft (522). The drive gear set (53) includes a drive gear one (531) fixed on the splined shaft (522), which meshes with a drive gear two (533) mounted on the drive gear shaft (532). The drive gear shaft (532) meshes with a drive gear three (534) fixed at one end of the rear axle wheel axle (55). The drive gear set (53) reduces speed and transmits rotational speed.

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