Rear walking drive system based on longitudinal transmission commutation and mini-tiller

Abstract

The application discloses a rear walking driving system based on longitudinal transmission commutation and a mini-tiller, which comprises a speed change mechanism, the input end of the speed change mechanism is connected with power, the output end of the speed change mechanism is connected with a rear walking driving mechanism, and characterized in that: a longitudinally arranged transmission commutation mechanism is arranged between the output end of the speed change mechanism and the input end of the rear walking driving mechanism, the upper end of the transmission commutation mechanism is connected with the speed change mechanism through a first bevel gear pair, the lower end of the transmission commutation mechanism is connected with the rear walking driving mechanism through a second bevel gear pair, an overload protection mechanism is arranged in the speed change mechanism, and a steering auxiliary mechanism is arranged on the rear walking driving mechanism. The rear walking driving system and the mini-tiller can improve safety performance and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to agricultural machinery, in particular to a mini-tiller. BACKGROUND

[0002] A kind of agricultural machinery with rear resistance driving system is disclosed in Chinese patent CN115280912A, and specifically discloses "main machine body, the main machine body includes first casing, main transmission system installed in first casing and work tool connected with main transmission system, handrail is installed on the upper portion of main machine body, and rear resistance driving system, the rear resistance driving system includes sub-transmission system arranged in second casing and rear walking assembly connected with sub-transmission system, the rear walking assembly is hingedly connected with the first casing;The speed output by the first casing and the second casing fixed connection, the speed output by the rear walking assembly 5 is less than the speed output by the work tool. So that the rear walking system generates resistance when plowing, the rear walking system is equivalent to the role of resistance, generates crawling force when the mini-tiller is blocked, so that the mini-tiller always works at a fixed speed, so as to ensure continuous work and save labor.

[0003] ……The rear resistance driving system is detachably connected to the rear portion of the main machine body, and includes a sub-transmission system arranged in a second casing and a rear walking assembly connected with the sub-transmission system, the rear walking assembly is hingedly connected with the first casing, specifically, a hinge joint is fixed on one side of the walking box, and a corresponding hinge joint is arranged on one side of the second casing, and a latch is used for connection……The walking box and the second casing are hingedly connected, so that the walking box can swing left and right relative to the second casing, which facilitates the operator to operate the handrail to turn and avoid the phenomenon of missed plowing during plowing.

[0004] ……The resistance transmission system assembly includes a first connecting shaft and a universal joint connector detachably connected to both ends of the first connecting shaft, and the universal joint connector is respectively connected with the power output assembly of the sub-transmission system and the resistance input shaft.

[0005] The technical solution in the above patent often causes the rear gear to be damaged during actual use, especially when encountering stones or hard soil during plowing, the failure rate of the rear gear is significantly increased. Moreover, the technical solution above is prone to over-rotation during turning, which requires a return rotation, and during this process, it can cause the machine to stop in place, which can easily damage the plow and increase the probability of personnel injury during adjustment of the turning angle. SUMMARY

[0006] The application aims to provide a rear walking resistance rear walking driving system based on longitudinal transmission reversing and a micro tiller with low failure rate and easy steering control.

[0007] The application aims to provide a rear walking resistance rear walking driving system based on longitudinal transmission reversing and a micro tiller with low failure rate and easy steering control.

[0008] Preferably, the transmission reversing mechanism comprises a reversing shaft assembly arranged longitudinally, a first driven bevel gear is arranged at the upper end of the reversing shaft assembly, the first driven bevel gear is in mesh transmission with a first driving bevel gear at the output end of the walking power output shaft of the speed change mechanism, a second driving bevel gear is arranged at the lower end of the reversing shaft assembly, and the second driving bevel gear is in mesh transmission with a second driven bevel gear at the input end of the walking power input shaft of the rear walking driving mechanism.

[0009] In order to further improve the safety performance, the overload protection mechanism is arranged on the walking power output shaft of the speed change mechanism, the overload protection mechanism comprises an output gear sleeved on the walking power output shaft, the side of the output gear towards the first driving bevel gear is limited by a shaft shoulder, the other side of the output gear is provided with an elastic assembly sleeved on the walking power output shaft, the elastic assembly is located between the end face of the output gear and the end face of the bearing, and a transmission sliding on the walking power output shaft, an overload protection disc is arranged between the end face of the output gear and the end face of the elastic assembly, the disc face of the overload protection disc is provided with a plurality of through holes arranged along the circumference, the end face of the output gear in contact with the overload protection disc is provided with a blind hole corresponding to each through hole, an overload ball is arranged in the through hole, and the outer diameter of the overload ball is smaller than that of the through hole and larger than that of the blind hole.

[0010] In order to further optimize the space structure, the end of the output gear towards the overload protection disc is provided with a circular groove with an inner diameter larger than the outer diameter of the overload protection disc and the outer diameter of the elastic assembly, and the overload protection disc is located in the circular groove.

[0011] For further easy installation, disassembly and maintenance, the reversing shaft assembly comprises an upper half reversing shaft and a lower half reversing shaft arranged along the longitudinal axis, the upper half reversing shaft is provided with the first driven bevel gear at the upper part, the lower half reversing shaft is provided with the second driven bevel gear at the lower part, and the lower end surface of the upper half reversing shaft and the upper end surface of the lower half reversing shaft are connected through a toothed structure.

[0012] For further modular installation and disassembly, a support frame assembly is further included, the transmission mechanism is externally provided with a transmission case, the upper half reversing shaft is fixed in the bearing seat through a bearing, the bearing seat is installed in the transmission case, and the lower part of the bearing seat is externally provided with a flange table which is fixedly connected with the bottom of the transmission case; the lower half reversing shaft is externally provided with a reversing case which is rotatably supported between the transmission case and the support frame assembly, and the walking power input shaft of the rear walking driving mechanism is externally provided with a shaft sleeve which is connected with the reversing case.

[0013] For further steering control, the support frame assembly comprises a support frame, the front end of the support frame is fixed, the rear end of the support frame is provided with a mounting table, the left and right ends of the mounting table are provided with mounting columns, the transmission case and the flange table are connected with the mounting columns through screws, the reversing case is rotatably supported between the transmission case and the support frame assembly, the steering auxiliary mechanism comprises double torsion springs which are sleeved on the left and right mounting columns, one end of the double torsion springs which faces away from the walking resistance mechanism is connected, the open two ends of the double torsion springs extend towards the walking resistance mechanism, the left and right sides of one end of the shaft sleeve which is connected with the reversing case are respectively provided with upward extending limiting nails, and the two ends of the double torsion springs which extend towards each other are located between the two limiting nails.

[0014] For further improvement of structural reliability, the mounting columns are provided with L-shaped limiting plates, one side of the L-shaped limiting plates is sleeved on the columns and located above the double torsion springs, the other side of the L-shaped limiting plates is located outside the double torsion springs and connected with the outer wall of the mounting columns.

[0015] For further improvement of reliability, the mounting table is provided with an upward protruding mounting table in the middle, the mounting sleeve is sleeved on the mounting table, and a sealing ring is arranged between the outer wall of the mounting sleeve and the inner wall of the reversing case; the outer wall of the upper part of the reversing case is provided with a circumferential circular table, the upper part of the reversing case extends into the bearing seat, the upper end surface of the circumferential circular table of the reversing case abuts against the lower end surface of the bearing seat and is provided with a sealing ring.

[0016] A micro tiller, comprising a rear walking driving system based on longitudinal transmission reversing as described above. Advantages

[0017] In the present application, the universal shaft transmission steering is cancelled, and a longitudinal transmission reversing mechanism is adopted, which not only ensures the smooth transmission of power from the speed change mechanism to the rear walking driving mechanism, but also realizes the turning during the walking through the bevel gear pair, thereby ensuring the reliability of power transmission and the reliability of turning, avoiding the damage of gears and the injury of personnel, improving the safety performance and reliability, and reducing the failure rate.

[0018] In the present application, the reversing shaft of the longitudinal transmission reversing mechanism is designed as upper and lower half shafts, and the upper and lower half shafts are connected through a toothed structure. The advantages of this design are: first, the left and right swinging of the rear walking driving mechanism can be more easily realized through the arrangement of the upper and lower half shafts, and the modular design is more beneficial, which is further beneficial to installation, disassembly, maintenance and cleaning; second, the toothed structure connecting the upper and lower half shafts can ensure the structure gap during the installation of the upper and lower half shafts, and can solve the problem of eccentricity of the upper and lower half shafts during rotation, avoiding the breakage of the shaft.

[0019] 3、In the present application, an overload protection mechanism is arranged between the speed change mechanism and the transmission reversing mechanism, which can disconnect the power transmission between the speed change mechanism and the transmission reversing mechanism under high speed conditions. Avoiding the direct transmission of power to the rear walking driving mechanism under high speed conditions, avoiding the damage of gears in the process of encountering stones or hard objects, and improving the reliability of the whole device.

[0020] 4、The rear walking driving mechanism and the transmission reversing mechanism in the present application are provided with a steering resistance and a reset mechanism. With such a special arrangement, the user can feel appropriate resistance during steering, and it is more convenient to adjust the steering angle. After steering is completed, it is easier to reset the rear walking driving mechanism and continue plowing.

[0021] 5、The structure of the present application can realize modular installation, disassembly, cleaning and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a left view of the micro tiller in the present application;

[0023] Figure 2 It is a rear view of the micro tiller in the present application;

[0024] Figure 3 It is Figure 2 A-A sectional view in the

[0025] Figure 4 It is Figure 3 enlarged view B in

[0026] Figure 5 is a C-C sectional view of Figure 1

[0027] Figure 6 is a D-D sectional view of Figure 1

[0028] Figure 7 is an enlarged view E of Figure 3

[0029] Figure 8 is a longitudinal transmission reversing structure diagram;

[0030] Figure 9 is a steering auxiliary mechanism structure diagram;

[0031] Figure 10 is an axonometric view of the gear shifting mechanism Figure 1 ;

[0032] Figure 11 is an axonometric view of the gear shifting mechanism Figure 2 . DETAILED DESCRIPTION

[0033] The present application will now be described in further detail with reference to the accompanying drawings, in which the application is not limited to these embodiments, any modification or replacement within the spirit of the present embodiments is still within the scope of the present application.

[0034] Example 1: As Figures 1-11 ​​​As shown, the embodiment provides a walking driving system based on longitudinal transmission reversing applied to a micro tiller, which comprises a speed change mechanism 100. The speed change mechanism in the embodiment comprises a main speed change mechanism 110 at the front end and a secondary speed change mechanism 120 at the rear end. The main speed change mechanism comprises a main shaft 111, one end of which is connected to a power mechanism. The main shaft transmits power to a tillage output shaft 112 after speed change. The tillage output shaft is connected to a transmission mechanism, which comprises a tillage transmission shaft 113 arranged longitudinally (in the up-down direction), and the tillage transmission shaft is connected to a tiller mechanism at the lower end. The rear end of the main shaft of the main speed change mechanism is drivingly connected to the secondary speed change mechanism 120. The secondary speed change mechanism transmits power to a walking power output shaft 121 after speed change. The walking power output shaft is drivingly connected to a longitudinal transmission reversing mechanism 200 through a first bevel gear pair. The transmission reversing mechanism transmits power to a rear walking driving mechanism 300 through a second bevel gear pair. In this process, power is transmitted from the front-rear transversely arranged walking power output shaft to the up-down longitudinally arranged transmission reversing mechanism, completing the first reversing of the transmission route. The power is further transmitted to the walking power input shaft 301 of the rear walking driving mechanism arranged transversely (front-rear direction) through the longitudinally arranged transmission reversing mechanism, completing the second reversing of the transmission route. The second bevel gear pair not only enables the reversing of the transmission route, but also enables the rear walking driving mechanism to realize steering swing (i.e., the rear walking driving mechanism can rotate around the longitudinal axis of the transmission reversing mechanism) through the second bevel gear pair.

[0035] Therefore, in the embodiment, the power is transmitted to the walking resistance mechanism after experiencing two reversings through the longitudinally arranged transmission reversing mechanism, which can ensure the reliability of the power transmission process and the reliability of the walking resistance mechanism during steering, improving the safety performance.

[0036] More specifically: the transmission reversing mechanism 200 in the embodiment includes a longitudinally arranged reversing shaft assembly, the upper end of the reversing shaft assembly is provided with a first driven bevel gear 201, the first driven bevel gear is in meshing transmission with a first driving bevel gear 122 of the output end of the walking power output shaft 121 of the transmission mechanism, the lower end of the reversing shaft assembly is provided with a second driving bevel gear 202, the second driving bevel gear is in meshing transmission with a second driven bevel gear 302 of the input end of the walking power input shaft 301 of the rear walking driving mechanism. Wherein, the first bevel gear pair is to realize the change of the power transmission direction, and the second bevel gear pair not only bears the function of the change of the power transmission direction, but also bears the function of realizing the steering swing of the rear walking driving mechanism in the use process. Wherein, the reversing shaft assembly can be only one reversing shaft, or composed of multiple shafts. In the embodiment, the reversing shaft assembly includes an upper half reversing shaft 203 and a lower half reversing shaft 204 arranged along the longitudinal axis, the upper half reversing shaft is provided with the first driven bevel gear on the upper part, the lower half reversing shaft is provided with the second driving bevel gear on the lower part, the lower end surface of the upper half reversing shaft and the upper end surface of the lower half reversing shaft are connected in transmission through a jawed structure 205. The advantages of such arrangement are: first, the arrangement of the upper and lower half shafts can more conveniently realize the left and right swing of the rear walking driving mechanism, and is more conducive to the modular design, further conducive to the installation, disassembly, maintenance, cleaning and the like; second, the connection of the upper and lower half shafts through the jawed structure can ensure the compensation of the structure gap during the installation of the upper and lower half shafts, and can solve the problem of different centers of the upper and lower half shafts during rotation, avoiding the breakage of the shaft.

[0037] As another embodiment in the embodiment, the auxiliary transmission mechanism further includes an overload protection mechanism. Since the plowing process of the micro plowing machine needs to be carried out at a very slow speed, if the speed is too fast, it will not only lead to unqualified plowing. And because the soil of the plowed land is too hard or stones are encountered during plowing, it is also easy to cause damage to the gears of the auxiliary transmission mechanism or the walking parts, and more seriously, the too fast speed will possibly cause personnel injury. Therefore, the purpose of the overload protection mechanism in the embodiment is to disconnect the power of the auxiliary transmission mechanism and the transmission reversing mechanism when the power transmitted by the auxiliary transmission mechanism is too fast, to avoid transmitting the power of the too fast rotating speed to the rear walking driving mechanism, and also to avoid the damage of the gears and the injury of the personnel.

[0038] Specifically, the walking power output shaft 121 of the auxiliary transmission mechanism is provided with an output gear 123, the side of the output gear facing the first driving bevel gear is limited by a shaft shoulder, and the other side of the output gear is provided with an elastic assembly sleeved on the walking power output shaft. The elastic assembly can be a spring, a disc spring assembly or a friction disc assembly 124. The friction disc assembly is located between the end face of the output gear and the bearing end face, and an overload protection disc 125 is arranged in transmission between the end face of the output gear and the end face of the friction disc assembly. The disc face of the overload protection disc is provided with a plurality of through holes 126 along the circumference, the end face of the output gear in contact with the overload protection disc is provided with a blind hole 127 corresponding to each through hole, an overload ball 128 is arranged in the through hole, the outer diameter of the overload ball is smaller than the inner diameter of the through hole and larger than the inner diameter of the blind hole. When there is no overload, the elastic assembly compresses the overload protection disc to make it adhere to the end face of the output gear, the overload ball is partially located in the blind hole of the output gear, the output gear and the overload protection disc are integrated to realize the transmission connection between the output gear and the walking power output shaft, power is transmitted to the output gear to further transmit the walking power output shaft, and then transmitted to the longitudinal transmission reversing mechanism. When the power rotation speed is too fast, the overload ball will be separated from the blind hole at the too fast rotation speed and compress the friction disc assembly, at this time, the output gear is separated from the overload protection disc, the output gear is only sleeved on the walking power output shaft, the walking power output shaft is not rotated without power, and the longitudinal transmission reversing mechanism is also not rotated without power. At this time, the rear walking driving mechanism is in a state without power, and only by reducing the speed of the transmission mechanism can the rear walking driving mechanism walk. In this way, the damage of the gear and the injury of the personnel caused by the too fast rotation speed transmitted to the rear walking power mechanism are avoided, and the safety performance and reliability are improved.

[0039] As another embodiment in the present embodiment, the end of the output gear facing the overload protection disc is provided with a circular groove 129 with a larger inner diameter than the overload protection disc and the friction disc assembly, and the overload protection disc is located in the circular groove. The friction disc assembly can also be replaced by a spring disc or other elastic assembly.

[0040] As another embodiment in the present embodiment, the main transmission mechanism is externally provided with a main transmission box 113, the auxiliary transmission mechanism is externally provided with an auxiliary transmission box 130, a middle partition plate is arranged between the main transmission box and the auxiliary transmission box, and the three are locked by screws. The tillage transmission shaft is externally provided with a transmission box 114, and the lower end of the main transmission box is locked to the transmission box by screws. The upper half reversing shaft is fixed in a bearing seat 206 by bearings, the bearing seat is installed in the auxiliary transmission box, a flange table 210 is arranged on the lower part of the outer circumference of the bearing seat, the flange table is locked to the bottom of the auxiliary transmission box by screws, the lower half reversing shaft is externally provided with a reversing box 207, the lower half reversing shaft is supported in the reversing box by bearings, the reversing box is open upward and downward, and an opening for connecting the rear walking driving mechanism is further arranged on one side (rear side) of the reversing box. A supporting assembly 400 for installation is further included, the reversing box is rotatably supported between the auxiliary transmission box and the supporting assembly, and the reversing box is connected to the rear walking driving mechanism to realize the steering or swinging of the rear walking driving mechanism. A steering auxiliary mechanism 410 is arranged between the supporting assembly and the rear walking driving mechanism. By the steering auxiliary mechanism, it is possible to avoid too large turning in the steering process of the rear walking driving mechanism.

[0041] Specifically: the support frame assembly comprises a support frame 401, the front end of which is fixed on the transmission case. In this embodiment, triangular reinforcing plates 402 are arranged on the left and right sides of the support frame, and the two triangular reinforcing plates sandwich the protruding part of the transmission case and are locked on the transmission case by screws. The rear end of the support frame is provided with a mounting table 403, the left and right ends of which are provided with mounting columns 411, and the auxiliary transmission case body and the flange table are connected with the mounting columns by screws. Moreover, a mounting table 404 protruding upward is arranged in the middle of the mounting table, a mounting sleeve 405 is sleeved on the mounting table, the lower end opening of the reversing case is sleeved outside the mounting sleeve, and a limiting circumferential step for the reversing case is arranged at the lower part of the mounting sleeve. The bottom of the mounting sleeve has a protruding part abutting against the mounting table. A sealing ring 406 is arranged between the outer wall of the mounting sleeve and the inner wall of the reversing case. A circumferential circular table 208 is arranged on the outer wall of the upper part of the reversing case, and the upper part of the reversing case protrudes into the bearing seat. The upper end surface of the circumferential circular table of the reversing case abuts against the lower end surface of the bearing seat and is provided with a sealing ring 209. In this way, the reversing case is supported between the auxiliary transmission case body and the support frame and is not connected by any connecting member, so that the reversing case can rotate around the longitudinal axis of the reversing shaft. In addition, in this embodiment, the side of the reversing case facing the rear walking driving mechanism is directly provided with the second power output bevel gear through a bearing, and the meshing state of the second power output bevel gear and the second power input bevel gear is ensured. Moreover, an inner spline is arranged in the inner hole of the second power output bevel gear, the walking power input shaft of the rear walking driving mechanism has an outer sleeve 303, the outer sleeve is locked with the reversing case by screws, and the end of the walking power input shaft facing the reversing case has an outer spline, which cooperates with the inner spline to realize power transmission. In this embodiment, the tooth surface of the second power output bevel gear faces upward, and the second power input bevel gear is arranged above the second power output bevel gear and meshes with it, so that the longitudinal structure can be optimized and space can be saved.

[0042] As to the turning assisting mechanism, a double torsion spring 412 is sleeved on the mounting column on the left and right sides, one end (lower end in this embodiment) of the double torsion spring is connected to the reversing box 414, the two open ends (upper ends in this embodiment) of the double torsion spring are obliquely extended towards the walking resistance mechanism, a support 304 is welded or screwed on the left and right sides of the end of the shaft sleeve connected to the reversing box, a limiting nail 305 is arranged on the upper part of the support, and the obliquely extended end of the double torsion spring is located between the two limiting nails and is limited by the limiting nails. In this embodiment, the distance between the two limiting nails is the same as the distance between the two ends of the double torsion spring, that is, the extended end of the double torsion spring is attached to the limiting nail or has a force acting on each other.

[0043] In addition, as another embodiment in this embodiment, an L-shaped limiting plate 306 is arranged on the mounting column, one side of the L-shaped limiting plate is sleeved on the mounting column and located above the double torsion spring, and the other side of the L-shaped limiting plate is connected to the outer wall of the mounting column at the part below the double torsion spring outside the double torsion spring, so that the double torsion spring is limited in a region. In addition, an arc-shaped groove 307 is arranged on the side wall of the L-shaped limiting plate towards the extended segment of the double torsion spring, and the extended segment of the double torsion spring is clamped in the arc-shaped groove.

[0044] In addition, in order to provide more choices for the agricultural workers when operating the mini-tiller, as another embodiment, the main speed change mechanism is provided with five gears, and the auxiliary speed change mechanism is provided with five gears.

[0045] In this embodiment, the five gears of the main speed change mechanism include three forward gears, one neutral gear and one reverse gear, and the five gears of the auxiliary speed change mechanism include four forward gears and one neutral gear. When the main speed change mechanism is in the neutral gear or the reverse gear, the auxiliary speed change mechanism is adjusted to the neutral gear. The three forward gears of the main speed change mechanism realize the adjustment of the three working speeds of the plow, and the working speed of the plow is adjusted according to the soil quality of the farmland. The four forward gears of the auxiliary speed change mechanism realize the adjustment of the four speeds of the rear walking driving mechanism, and the working speed of the plow is adjusted according to the soil quality of the farmland.

[0046] Specifically: the main transmission mechanism includes a transversely arranged main shaft, an intermediate shaft, a tillage output shaft and a reverse shaft, the main shaft has axially fixed and drivingly arranged first forward driving gear, third forward driving gear, power output driving gear and reverse driving gear, the intermediate shaft has axially fixed and drivingly arranged second forward driving gear and bridge gear, the reverse shaft has axially fixed and drivingly arranged reverse bridge gear and reverse intermediate gear, the tillage output shaft has axially fixed and idling arranged bridge double gear, axially sliding and drivingly arranged output double gear and axially fixed and drivingly arranged tillage output gear. The power output gear on the main shaft meshes with one of the gears of the bridge double gear on the output shaft, and the other gear of the bridge double gear meshes with the bridge gear on the intermediate shaft. In this way, power is transmitted from the main shaft to the intermediate shaft through the bridge double gear on the output shaft. The reverse driving gear on the main shaft meshes with the reverse bridge gear on the reverse shaft to directly transmit power from the main shaft to the reverse shaft.

[0047] When it is necessary to switch gears, the output double gear on the tillage output shaft is driven by the gear shifting mechanism to slide on the tillage output shaft and mesh with different gears on different shafts to achieve gear switching. First forward gear: the output double gear is driven to slide so that its pinion meshes with the first forward driving gear on the main shaft, and power is directly transmitted from the main shaft to the tillage output shaft, i.e. first forward gear is achieved. Second forward gear: the output double gear is driven to slide so that its gear meshes with the second forward driving gear on the intermediate shaft, and power is transmitted from the main shaft to the intermediate shaft through the bridge double gear, and then from the intermediate shaft to the tillage output shaft, i.e. second forward gear is achieved. Third forward gear: the output double gear is driven to slide so that its gear meshes with the third forward driving gear on the main shaft, and power is directly transmitted from the main shaft to the tillage output shaft, i.e. third forward gear is achieved. Neutral gear: the output double gear is driven to slide so that neither its gear nor its pinion meshes with any gear, i.e. neutral gear is achieved. Reverse gear: the gear of the output double gear meshes with the reverse intermediate gear on the reverse shaft, and power is transmitted from the main shaft to the reverse shaft and then to the tillage output shaft, i.e. reverse gear is achieved.

[0048] The auxiliary transmission mechanism is located at the rear end of the main transmission mechanism, and the rear end of the reverse shaft of the main transmission mechanism is provided with an auxiliary transmission power output gear. The auxiliary transmission mechanism comprises an auxiliary transmission main shaft, an auxiliary transmission intermediate shaft and a walking power output shaft. The auxiliary transmission main shaft is provided with an auxiliary transmission power input gear, a first driving gear and a second driving gear which are axially fixed and drivingly arranged, the auxiliary transmission intermediate shaft is provided with a driven double gear and a driving double gear which are axially slidable and drivingly arranged, and the new public ancestor walking power output shaft is provided with a walking output gear, a first driven gear and a second driven gear which are axially fixed and drivingly arranged. The auxiliary transmission power input gear on the auxiliary transmission main shaft is in meshing transmission with the auxiliary transmission power output gear on the reverse shaft of the main transmission mechanism, so that the power can be transmitted from the main transmission mechanism to the auxiliary transmission mechanism. One gear sliding of the driven double gear on the auxiliary transmission intermediate shaft is in meshing transmission with the first driving gear on the auxiliary transmission main shaft, and the other gear sliding of the driven double gear is in meshing transmission with the second driving gear on the auxiliary transmission main shaft, so that the power can be transmitted from the auxiliary transmission main shaft to the auxiliary transmission intermediate shaft. One gear sliding of the driving double gear on the auxiliary transmission intermediate shaft is in meshing transmission with the first driven gear on the walking power output shaft, and the other gear sliding of the driving double gear is in meshing transmission with the second driven gear on the auxiliary transmission output shaft, so that the power can be transmitted from the auxiliary transmission intermediate shaft to the walking power output shaft. Through the above-mentioned arrangement of the auxiliary transmission mechanism, two gear shifts are realized between the auxiliary transmission main shaft and the auxiliary transmission intermediate shaft, and two gear shifts are realized between the auxiliary transmission intermediate shaft and the walking power output shaft, so that four forward gear shifts are realized when the final output is realized, and when the driven double gear and / or the driving double gear on the auxiliary transmission intermediate shaft is not in meshing transmission with any gear, the neutral gear is realized.

[0049] The above-mentioned arrangement and processing of the embodiment can realize the reliability of power transmission, the reliability and safety of turning, and also realize the modular installation and disassembly. The finished transmission mechanism is taken as module one, the upper half reversing shaft and its bearing seat are taken as module two, the lower half reversing shaft and its reversing box are taken as module three, the supporting assembly is taken as module four, and the walking power input shaft and its shaft sleeve are taken as module five. When installed, module two is installed on module one by screws, then the front end of module four is installed on the reversing box, at the same time, module three is supported between module two and module four, and then module five is screwed with the rear part of module three. In this way, no matter which module has a problem, only a few screws are needed to realize the installation, disassembly, replacement of parts, maintenance and the like.

[0050] In addition, the embodiment further provides a mini cultivator, which comprises the speed change mechanism, the front end of the speed change mechanism is connected with a transmission mechanism, the lower end of the transmission mechanism is connected with a front axle, and the two ends of the front axle are connected with cultivators. The front end of the speed change mechanism is further provided with a power mechanism, i.e. an engine. The rear end of the speed change mechanism is connected with the longitudinal transmission reversing mechanism, the lower end of the transmission reversing mechanism is connected with the rear walking driving mechanism, the rear end of the rear walking driving mechanism is provided with a rear axle, and the two ends of the rear axle are connected with walking wheels or walking resistance wheels 308. The rear end of the rear walking driving mechanism is further provided with a support walking wheel 309 extending downward. The upper end of the speed change mechanism is provided with a control assembly, the upper end of the control assembly is provided with operation handles 500 extending upward and rearward on both sides, and a control rod 501 for adjusting the main speed change mechanism and the auxiliary speed change mechanism is arranged between the two operation handles.

Claims

1. A rear driving system based on longitudinal transmission commutation, comprising a gear shifting mechanism, an input end of the gear shifting mechanism being connected with power, and an output end of the gear shifting mechanism being connected with a rear driving mechanism, characterized in that: The output end of the variable speed mechanism is provided with a longitudinally arranged transmission reversing mechanism, the upper end of the transmission reversing mechanism is connected with the variable speed mechanism through a first bevel gear pair, the lower end of the transmission reversing mechanism is connected with the rear walking driving mechanism through a second bevel gear pair, an overload protection mechanism is arranged in the variable speed mechanism, and a steering auxiliary mechanism is arranged on the rear walking driving mechanism; The transmission reversing mechanism comprises a longitudinally arranged reversing shaft assembly, the upper end of the reversing shaft assembly is provided with a first driven bevel gear, the first driven bevel gear is in meshing transmission with a first driving bevel gear at the output end of a walking power output shaft of the variable speed mechanism, and the lower end of the reversing shaft assembly is provided with a second driving bevel gear, the second driving bevel gear is in meshing transmission with a second driven bevel gear at the input end of a walking power input shaft of the rear walking driving mechanism; The reversing shaft assembly comprises an upper half reversing shaft and a lower half reversing shaft arranged along the same longitudinal axis, the first driven bevel gear is arranged on the upper part of the upper half reversing shaft, the second driving bevel gear is arranged on the lower part of the lower half reversing shaft, and the lower end face of the upper half reversing shaft and the upper end face of the lower half reversing shaft are in toothed engagement type transmission; The variable speed mechanism further comprises a support frame assembly, the variable speed mechanism is provided with a variable speed box body, the upper half reversing shaft is fixed in a bearing seat through a bearing, the bearing seat is installed in the variable speed box body, the lower part of the bearing seat is provided with a flange table, and the flange table is fixedly connected with the bottom of the variable speed box body; the lower half reversing shaft is provided with a reversing box body, the reversing box body is rotatably supported between the variable speed box body and the support frame assembly, and the walking power input shaft of the rear walking driving mechanism is provided with a shaft sleeve, and the shaft sleeve is connected with the reversing box body; The support frame assembly comprises a support frame, the front end of the support frame is fixed, the rear end of the support frame is provided with a mounting table face, the left and right ends of the mounting table face are provided with mounting stand columns, the variable speed box body and the flange table are connected with the mounting stand columns through screws, the reversing box body is rotatably supported between the variable speed box body and the support frame assembly, the steering auxiliary mechanism comprises double torsion springs sleeved on the mounting stand columns on the left side and the right side, one end of the double torsion springs away from the walking resistance mechanism is connected, the two open ends of the double torsion springs are extended towards the walking resistance mechanism, the left and right sides of one end of the shaft sleeve connected with the reversing box body are respectively provided with upward extending limiting nails, and the two ends of the double torsion springs extended towards each other are located between the two limiting nails.

2. The longitudinal drive-reverse system of claim 1, wherein: The overload protection mechanism is arranged on the walking power output shaft of the variable speed mechanism, and comprises an output gear sleeved on the walking power output shaft. One side of the output gear towards the first driving bevel gear is limited by a shaft shoulder, and the other side of the output gear is provided with an elastic assembly sleeved on the walking power output shaft. The elastic assembly is located between the end surface of the output gear and the bearing end surface, and a transmission sliding overload protection disc on the walking power output shaft is arranged between the end surface of the output gear and the end surface of the elastic assembly. The disc surface of the overload protection disc is provided with a plurality of through holes in the circumferential direction. The end surface of the output gear in contact with the overload protection disc is provided with a blind hole corresponding to each through hole. An overload ball is arranged in the through hole, and the outer diameter of the overload ball is smaller than the through hole and larger than the blind hole.

3. The longitudinally transmitted reversed rear drive system of claim 2, wherein: The end of the output gear towards the overload protection disc is provided with a circular groove with an inner diameter larger than the outer diameter of the overload protection disc and the outer diameter of the elastic assembly, and the overload protection disc is located in the circular groove.

4. The longitudinally transmitted reversed rear drive system of claim 3, wherein: An L-shaped limiting plate is arranged on the mounting column, one side of the L-shaped limiting plate is sleeved on the mounting column and located above the double torsion springs, and the other side of the L-shaped limiting plate is located outside the double torsion springs and connected to the outer wall of the mounting column below the double torsion springs.

5. The longitudinally transmitted reversed rear drive system of claim 4, wherein: An upwardly protruding mounting table is arranged in the middle of the mounting table, and a mounting sleeve is sleeved on the mounting table. The lower end of the reversing box is sleeved outside the mounting sleeve, and a sealing ring is arranged between the outer wall of the mounting sleeve and the inner wall of the reversing box. A circumferential circular table is arranged on the upper outer wall of the reversing box. The upper part of the reversing box protrudes into the bearing seat, and the upper end surface of the circumferential circular table of the reversing box abuts against the lower end surface of the bearing seat and is provided with a sealing ring.

6. A mini-tiller comprising the rear walking driving system based on longitudinal transmission reversing according to any one of the preceding claims.

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