Mini-tiller

Abstract

The utility model relates to the technical field of agricultural machinery, and provides a mini-tiller which comprises a transmission shaft, a driven gear and at least two output gear sets, the driven gear is connected with the transmission shaft, and the driven gear is used for power input; the at least two output gear sets are connected with the transmission shaft and arranged on the two sides of the driven gear, and the output gear sets are used for power output. By arranging the output gear sets on the transmission shafts on the two sides of the driven gear respectively, switching from two-wheel drive to four-wheel drive can be achieved, expansion from two-wheel drive to four-wheel drive is achieved, the overall structure is simple, and the manufacturing cost is low.

Description

[0001] Explanation on claiming priority: This application claims priority based on the patent application filed in China on April 12, 2024 with application number 202420758703.X and patent name "Speed Shifting Device and Micro-Tilling Machine for Agricultural Machinery" Technical Field

[0002] The utility model relates to the technical field of agricultural machinery, in particular to a micro-tillage machine. Background Art

[0003] A tiller is a type of agricultural machinery used for tilling and preparing soil. It is used to improve soil quality, soil structure, and crop growth, thereby increasing farmland yields and improving agricultural production efficiency.

[0004] In the related art, micro-tillers are usually driven by either two-wheel drive or four-wheel drive, which limits the expansion and application of existing micro-tillers. In addition, the four-wheel drive transmission technology is complex in structure and has high manufacturing costs. Summary of the Invention

[0005] The utility model provides a micro-tillage machine, which is used to solve the defects in the prior art that it is difficult to expand from two-wheel drive to four-wheel drive and the traditional four-wheel drive has a complex structure.

[0006] The utility model provides a speed change device for agricultural machinery, comprising:

[0007] transmission shaft;

[0008] A driven gear connected to the transmission shaft, the driven gear being used for power input;

[0009] At least two output gear sets are connected to the transmission shaft and arranged on both sides of the driven gear, and the output gear sets are used for power output.

[0010] According to the speed change device for agricultural machinery provided by the utility model, the speed change device further includes a driving mechanism, and the output end of the driving mechanism is engaged with the driven gear to drive the driven gear to rotate through the driving mechanism.

[0011] According to the speed change device for agricultural machinery provided by the utility model, the driving mechanism includes a driving gear, a connecting shaft and a transmission gear, one end of the connecting shaft is connected to the driving gear, the other end of the connecting shaft is connected to the transmission gear, and the transmission gear is meshed with the driven gear.

[0012] According to the speed change device for agricultural machinery provided by the utility model, the output gear group includes a movable gear group and a fixed gear group, the movable gear group is slidingly connected to the transmission shaft so as to be able to move along the axial direction of the transmission shaft, and the fixed gear group is fixedly connected to the transmission shaft.

[0013] According to the speed change device for agricultural machinery provided by the utility model, the movable gear set includes a first gear and a second gear, and the first gear and the second gear have different transmission ratios;

[0014] A connecting sleeve is provided between the first gear and the second gear. The connecting sleeve is slidably provided on the transmission shaft. An annular groove for cooperating with a shift fork is provided on the connecting sleeve so that the shift fork can be used to move the connecting sleeve to slide on the transmission shaft.

[0015] According to the speed change device for agricultural machinery provided by the utility model, the fixed gear set includes a first fixed gear;

[0016] It also includes a shift shaft, which is arranged on one side of the transmission shaft. A shift gear and a second fixed gear are provided on the shift shaft. The second fixed gear and the first fixed gear are engaged for transmission. The shift gear is slidably arranged on the shift shaft, and the second fixed gear is fixed on the shift shaft. A shift fork sleeve is provided on one side of the shift gear, and the shift fork sleeve is used to cooperate with another shift fork to shift the shift gear on the shift shaft through the other shift fork.

[0017] The present utility model also provides a micro-tiller, comprising: a micro-tiller body, the micro-tiller body comprising a front box and a rear box, the front box being connected to the rear box, the proximal end of the rear box being provided with a speed change device for agricultural machinery as described in any one of the above items; a first transmission system is provided in the front box, and a first output shaft is provided at the distal end of the front box, the first transmission system can selectively cooperate with the speed change device to selectively drive the first output shaft to rotate; a second transmission system is provided in the rear box, and a second output shaft is provided at the distal end of the rear box, the second transmission system can selectively cooperate with the speed change device to selectively drive the second output shaft to rotate.

[0018] According to the micro-tiller provided by the present invention, the first transmission system includes a chain transmission mechanism, the chain transmission mechanism includes a front axle output gear and a transmission chain, the transmission chain is wound between the front axle output gear and the first output shaft to realize the torque transmission of the speed change device through the transmission chain.

[0019] According to the micro-tiller provided by the present invention, the second transmission system includes a multi-stage gear transmission mechanism, and the multi-stage gear transmission mechanism includes a plurality of gear shafts that mesh with each other for transmission, wherein the gear shaft located at the head end meshes with the speed change device for transmission, and the gear shaft located at the tail end meshes with the second output shaft for transmission.

[0020] According to the micro-tiller provided by the utility model, it also includes a forward-rotating shift lever and a rear-rotating shift lever, and the forward-rotating shift lever and the rear-rotating shift lever are both arranged on the rear box body; the forward-rotating shift lever is provided with a first shift fork, and the rear-rotating shift lever is provided with a second shift fork, and the first shift fork and the second shift fork are used to cooperate with the speed change device to realize switching between two-wheel drive and four-wheel drive.

[0021] According to any of the above embodiments, the present invention has at least the following beneficial effects:

[0022] The utility model provides a micro-tiller, which can switch from two-wheel drive to four-wheel drive by respectively arranging output gear sets on the transmission shafts on both sides of the driven gear, thereby realizing the expansion of two-wheel drive to four-wheel drive, and has a simple overall structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 The utility model is a schematic diagram of the three-dimensional structure of a speed change device for agricultural machinery provided by the utility model.

[0025] Figure 2 This is one of the overall structural diagrams of the micro-tillage machine provided by the utility model.

[0026] Figure 3 This is the second schematic diagram of the overall structure of the micro-tillage machine provided by the utility model.

[0027] Figure 4 This is one of the internal assembly structure diagrams of the micro-tillage machine provided by the utility model.

[0028] Figure 5 This is the second assembly structure diagram of the internal structure of the micro-tillage machine provided by the utility model.

[0029] Reference numerals:

[0030] 100, transmission shaft; 200, driven gear; 300, output gear set; 301, fixed gear set; 302, movable gear set; 302-1, first gear; 302-2, second gear; 400, driving mechanism; 401, driving gear; 402, connecting shaft; 403, transmission gear; 500, housing coupling plate; 600, front housing; 610, first output shaft; 620, first transmission system; 620-1, transmission chain; 700, rear housing; 710, forward-rotating shift lever; 710-1, first shift fork; 720, rear-rotating shift lever; 720-1, second shift fork; 730, second output shaft; 740, second transmission system; 740-1, gear shaft; 800, shift shaft; 810, shift gear; 820, second fixed gear. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "inside", "one side", "axial", "upper", "lower", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, unless otherwise explicitly and specifically defined, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implying the quantity of the indicated technical features.

[0034] In this utility model, unless otherwise specified or limited, the terms "connection", "configuration", "arrangement", etc. should be understood in a broad sense. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection between two components or the interaction between two components, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0035] A tiller is a versatile agricultural tool used for land preparation, tillage, seeding preparation, and land preparation. It improves soil quality, promotes plant growth, and supports the planting and cultivation of crops. Related technologies include two-wheel drive (2WD) and four-wheel drive (4WD) tillers. Two-wheel drive tillers utilize a transmission system to transmit power to a pair of wheels or a set of tilling blades, enabling the machine to move or cultivate the land. Four-wheel drive tillers utilize a transmission system to transmit power to two pairs of wheels or two sets of tilling blades, enabling the machine to move or cultivate the land.

[0036] Related technologies use either two-wheel drive or four-wheel drive micro-tillers. Two-wheel drive micro-tillers struggle to achieve effective tillage in some scenarios, reducing tillage efficiency. Four-wheel drive micro-tillers are difficult to adapt to certain scenarios, resulting in low tillage efficiency and higher tillage costs. Furthermore, the speed change mechanism of four-wheel drive micro-tillers is complex and expensive to manufacture.

[0037] In view of the problems in the related technology, the following Figure 1 The utility model describes a speed change device for agricultural machinery, comprising a transmission shaft 100, a driven gear 200, and at least two output gear sets 300. The driven gear 200 is connected to the transmission shaft 100 and is used for power input; at least two output gear sets 300 are connected to the transmission shaft 100 and arranged on both sides of the driven gear 200, and the output gear sets 300 are used for power output. Power provides a power source for the speed change device, which is transmitted and shifted through the speed change device. In this embodiment, power input is achieved through the driven gear 200, and the input power is output through the two output gear sets 300. In this way, the conversion from two-wheel drive to four-wheel drive can be achieved, so that the micro-tiller can select different modes to operate in different scenarios, thereby improving the applicability of the micro-tiller.

[0038] It is understandable that in this embodiment, the output of power is achieved respectively by the two output gear sets 300 on the transmission shaft 100, thereby enabling the conversion from two-wheel drive to four-wheel drive. For example, in some scenarios such as some flat small farmlands, only two-wheel drive is needed to achieve effective farming. If four-wheel drive is used, kinetic energy will be wasted, and more soil compaction and ground damage may be caused, which may have a certain impact on soil quality and the ecological environment, resulting in a decrease in the effective cultivated area. The four-wheel drive transmission device in the related art has a complex structure and high manufacturing cost. However, this embodiment can achieve two-wheel drive operation by changing the coordination with a set of output gear sets 300. Of course, when some complex terrains and large areas of farmland need to be cultivated, four-wheel drive operation can be achieved by coordinating with two sets of output gears to improve work efficiency.

[0039] When setting specific Figure 1As shown, the transmission shaft 100 has splines, and the driven gear 200 and the output gear set 300 are connected to the transmission shaft 100 through the splines, so that the driven gear 200 can drive at least two sets of output gear sets 300 to rotate when rotating.

[0040] In this embodiment, there is no limit on the number of output gear sets 300. There can be two sets or more than two sets of output gear sets 300. Multiple sets of output gear sets 300 are arranged on both sides of the driven gear 200. The arrangement on both sides can facilitate the connection between the output gear sets 300 and the transmission system, which is beneficial to the structural design and the transmission of power.

[0041] In this embodiment, there is no limitation on the connection method of the output gear set 300. That is, the output gear set 300 can be fixedly connected or slidably connected. These two different connection methods can realize switching between two-wheel drive and four-wheel drive. Those skilled in the art will know the specific implementation method after knowing the above embodiments.

[0042] According to one embodiment of the present invention, the speed change device further includes a drive mechanism 400, the output end of which meshes with the driven gear 200 to drive the driven gear 200 to rotate. The driven gear 200 is rotated by the drive mechanism 400. In this embodiment, the drive mechanism 400 can input power, and then the rotation of the driven gear 200 drives the transmission shaft 100 to rotate. The entire device has high transmission efficiency and low energy loss.

[0043] In a specific example, the input end of the driving mechanism 400 is connected to the output end of the power, and the power output end outputs torque and transmits it to the driven gear 200 through the driving mechanism 400 .

[0044] Specifically, the drive mechanism 400 includes a drive gear 401, a connecting shaft 402, and a transmission gear 403. One end of the connecting shaft 402 is connected to the drive gear 401, and the other end of the connecting shaft 402 is connected to the transmission gear 403. The transmission gear 403 meshes with the driven gear 200. The transmission gear 403 receives torque through the connecting shaft 402, and the torque is transmitted through the meshing of the transmission gear 403 and the driven gear 200.

[0045] In a specific example, Figure 1As shown, the transmission gear 403 is a bevel gear structure, and the driven gear 200 is a disc gear structure, that is, one end of the connecting shaft 402 is connected to the driving gear 401, and the other end of the connecting shaft 402 is connected to the bevel gear as the transmission gear 403. The engagement between the bevel gear and the disc gear realizes the transmission of torque on the one hand, and the change of the rotation direction on the other hand, so as to make the structure of the driving mechanism 400 more compact, reduce the overall volume occupancy and manufacturing cost, and improve the efficiency of power transmission.

[0046] In some examples, the output gear set 300 includes at least one output gear. Figure 1 As shown, an output gear is connected to one side of the driven gear 200, and the output gear can be connected to the transmission component to achieve power output. Of course, in this embodiment, the output gears can also be two, three, or more, and the multiple output gears can have the same transmission ratio or different transmission ratios.

[0047] According to one embodiment of the present invention, at least one of the two output gear sets 300 is slidably connected to the transmission shaft 100 to enable axial movement of the transmission shaft 100. In this embodiment, the output gear set 300 is axially movable along the transmission shaft 100, enabling connection to the power transmission system by driving the transmission gear set 403 to slide when required, facilitating switching between two-wheel drive and four-wheel drive. For example, by providing a shift fork or other shifting member, the output gear set 300 can be operated to move along the transmission shaft 100. When moved to a predetermined position, the output gear set 300 can engage with the power transmission member, thereby achieving power output to drive the rotation of the wheels or plow blades.

[0048] like Figure 1 As shown in the specific embodiment, the output gear set 300 includes a movable gear set 302 and a fixed gear set 301. The movable gear set 302 is slidably connected to the transmission shaft 100 so as to be movable along the axial direction of the transmission shaft 100, while the fixed gear set 301 is fixedly connected to the transmission shaft 100. The fixed gear set 301 enables fixed torque transmission, while the movable gear set 302 enables selective meshing transmission with the transmission system through the cooperation of a shift fork or the like.

[0049] Specifically, the movable gear set 302 and the fixed gear set 301 are correspondingly arranged on both sides of the driven gear 200. The fixed gear is fixedly connected to the transmission shaft 100, and the movable gear set 302 can move along the axial direction of the transmission shaft 100 to achieve gear shifting.

[0050] In a specific embodiment, the movable gear set 302 includes a first gear 302-1 and a second gear 302-2. The first gear 302-1 and the second gear 302-2 have different transmission ratios. A connecting sleeve is provided between the first gear 302-1 and the second gear 302-2. The connecting sleeve is slidably mounted on the transmission shaft 100. The connecting sleeve is provided with an annular groove for engaging with a shift fork, so that the shift fork can shift the connecting sleeve to slide on the transmission shaft 100. The provision of two different transmission ratios allows different transmission ratios to be used according to different farming scenarios to achieve different farming efficiency. The annular groove cooperates with the shift fork to achieve gear shifting.

[0051] It is understandable that different rotation speeds of wheels or tillage blades are required in different scenarios. In this embodiment, a speed change effect is achieved by setting gears with different transmission ratios on the same group of output gear sets 300, thereby improving the applicability of the device.

[0052] In a specific embodiment, the fixed gear group 301 includes a first fixed gear; it also includes a shift shaft, which is arranged on one side of the transmission shaft 100, and is provided with a shift gear and a second fixed gear 820. The second fixed gear 820 and the first fixed gear are engaged for transmission, and the shift gear is slidably arranged on the shift shaft, and the second fixed gear 820 is fixed on the shift shaft. A shift fork sleeve is provided on one side of the shift gear, and the shift fork sleeve is used to cooperate with another shift fork to shift the shift gear and slide on the shift shaft through the other shift fork.

[0053] Specifically, the first fixed gear is fixed on the transmission shaft 100 and meshes with the second fixed gear 820, so that it can transmit power to the shift shaft, and then switch between two-wheel drive and four-wheel drive through the shift fork.

[0054] It's understandable that this method allows for rapid gear shifting, a simple overall structure, and reduced manufacturing costs. Specifically, the movable gear on one side of the driven gear 200 enables power transmission to one side (i.e., two-wheel drive), while the fixed gear set 301 on the other side of the driven gear 200 enables power transmission to the other side (i.e., four-wheel drive). The specific shifting process will be explained in detail below with reference to a micro-tiller.

[0055] Another aspect of the present invention provides a micro-tillage machine, comprising a micro-tillage machine body, the micro-tillage machine body comprising a front housing 600 and a rear housing 700, the front housing 600 being connected to the rear housing 700, the proximal end of the rear housing 700 being provided with a speed change device for agricultural machinery as provided in any of the above items; a first transmission system 620 being provided in the front housing 600, and a first output shaft 610 being provided at the distal end of the front housing 600, the first transmission system 620 being selectively coupled with the speed change device to selectively drive the first output shaft 610 for rotation; a second transmission system 740 being provided in the rear housing 700, and a second output shaft 730 being provided at the distal end of the rear housing 700, the second transmission system 740 being selectively coupled with the speed change device to selectively drive the second output shaft 730 for rotation. Typically, micro-tillage machines only have two-wheel drive or only provide four-wheel drive, and the switching between two-wheel drive and four-wheel drive is relatively complex, resulting in excessively high overall manufacturing costs. In this embodiment, the switching between two-wheel drive and four-wheel drive can be achieved through the speed change device, and the speed change device has a simple overall structure, is easy to operate, and can achieve rapid switching.

[0056] Specifically, the first output shaft 610 and the second output shaft 730 can be used to install a drive wheel or a plowing blade, which can be selected and installed according to specific needs. After the drive wheel or the plowing blade is installed, the power can be transmitted to the first output shaft 610 and the second output shaft 730 respectively through the first transmission system 620 and the second transmission system 740, thereby realizing the driving of the first output shaft 610 and the second output shaft 730.

[0057] When setting specific Figure 2 、 Figure 3 As shown, an installation space is formed in both the front housing 600 and the rear housing 700, wherein the end of the front housing 600 and the rear housing 700 close to the drive mechanism 400 is the proximal end, and the end away from the drive mechanism 400 is the distal end. The above-mentioned speed change device is installed in the proximal installation space of the rear housing 700, and the front housing 600 is connected to the proximal position of the rear housing 700, forming an outer contour structure similar to an "in" shape, which enables the first output shaft 610 and the second output shaft 730 to support the entire micro-tiller for movement or cultivation.

[0058] The first transmission system 620 and the second transmission system 740 can transmit the torque output by the speed change device to their respective output shafts, thereby achieving two-wheel drive operation or four-wheel drive operation.

[0059] In some embodiments, such as Figure 2-Figure 4As shown, the micro-tiller also includes a forward-rotating shift lever 710 and a backward-rotating shift lever 720, both of which are arranged on the rear box 700; the forward-rotating shift lever 710 is provided with a first shift fork 710-1, and the backward-rotating shift lever 720 is provided with a second shift fork 720-1. The first shift fork 710-1 and the second shift fork 720-1 are used to cooperate with the speed change device to achieve switching between two-wheel drive and four-wheel drive. The setting of the two shift forks can achieve switching between two-wheel drive and four-wheel drive, which is convenient to operate and the overall structure is simple and easy to prepare.

[0060] Specifically, if Figure 4 、 Figure 5 As shown, the first shift fork 710-1 cooperates with the connecting sleeve, and the two ends of the connecting sleeve are correspondingly connected to the first gear 302-1 and the second gear 302-2. The first shift fork 710-1 cooperates with the annular groove on the connecting sleeve, so that the forward shift lever 710 can slide along the axial direction of the transmission shaft 100 under the action of external force, thereby realizing "fast gear", "neutral gear" and "slow gear". Figure 5 As shown, the first gear 302-1 is a large gear and the second gear 302-2 is a small gear. When the first gear 302-1 is engaged with the first transmission system 620, it is a large gear transmission, thereby increasing the speed, that is, "slow gear". The second gear 302-2 is a small gear transmission when it is engaged with the first transmission system 620, thereby reducing the speed, that is, "fast gear". When there is a gap between the first gear 302-1 and the second gear 302-2, power transmission is not achieved, that is, "neutral gear". In this way, the drive switching of the first output shaft 610 can be achieved.

[0061] Similarly, the second shift fork 720-1 cooperates with the shift fork sleeve of the shift gear, so that the rearward-rotating shift lever 720 can slide along the axial direction of the shift shaft under the action of external force, thereby realizing "neutral gear" and "forward gear". Figure 5As shown, the shift shaft 800 is provided with two gears: a second fixed gear 820 and a shift gear 810. The second fixed gear 820 is normally meshed with the first fixed gear, enabling it to transmit power from the drive mechanism 400 to the shift shaft 800. The shift gear 810, driven by the second shift fork 720-1, can selectively mesh with the second transmission system 740 to transmit power. That is, when the shift gear 810 is meshed, it is in "forward gear" and can drive the second output shaft 730. When it is not meshed, it is in "neutral gear". In "neutral gear", the shift gear 810 is not meshed with the second transmission system 740, so that the second output shaft 730 is not driven. In this way, switching between two-wheel drive and four-wheel drive can be achieved. That is, when two-wheel drive is required, the shift gear 810 is in the "neutral" state, and the first shift fork 710-1 can be shifted to rotate the first output shaft 610. When four-wheel drive is required, the shift gear 810 is in the "forward gear" state. At this time, the first output shaft 610 is driven by the first transmission system 620, and the second output shaft 730 is driven by the second transmission system 740, thereby achieving four-wheel drive. The overall operation is convenient, the structure is simple, and fast shifting can be achieved.

[0062] In some embodiments, the first transmission system 620 includes a chain transmission mechanism, which includes a front axle output gear and a transmission chain 620-1. The transmission chain 620-1 is wound between the front axle output gear and the first output shaft 610 to achieve torque transmission of the speed change device through the transmission chain 620-1. The chain transmission mechanism can achieve rapid transmission and improve its transmission efficiency.

[0063] Specifically, if Figure 5 As shown, the front axle output gear is provided on one side of the transmission shaft 100. The first gear 302-1 and the second gear 302-2 can selectively mesh with the front axle output gear under the drive of the first shift fork 710-1. After meshing, the front axle output gear can transmit torque and drive the transmission chain 620-1 to rotate, thereby driving the first output shaft 610. When different speeds are required, speed switching is achieved by switching the meshing of the first gear 302-1 and the second gear 302-2.

[0064] In some embodiments, the second transmission system 740 includes a multi-stage gear transmission mechanism, which includes multiple intermeshing gear shafts 740-1. The gear shaft 740-1 at the front end meshes with the speed change device, and the gear shaft 740-1 at the rear end meshes with the second output shaft 730. The multi-stage gear transmission mechanism can achieve power transmission, thereby driving the second output shaft 730.

[0065] Specifically, if Figure 5As shown, the second transmission system 740 includes three intermeshing gear shafts 740-1. The end closest to the drive mechanism 400 is the head end, and the end farther from the drive mechanism 400 is the tail end. Power is transmitted from the head end to the tail end. Each of the three gear shafts 740-1 is equipped with two meshing gears to achieve mutual meshing. Corresponding gears for power transmission are provided on the second output shaft 730, thereby achieving meshing transmission with the tail end gear shaft 740-1.

[0066] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can realize the switching from two-wheel drive to four-wheel drive by respectively arranging the output gear set 300 on the transmission shaft 100 on both sides of the driven gear 200, thereby realizing the expansion from two-wheel drive to four-wheel drive, and the overall structure is simple and the manufacturing cost is low.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A micro-tillage machine, characterized in that: include: A micro-tiller body, the micro-tiller body includes a front box body and a rear box body, the front box body is connected to the rear box body, and a speed change device is provided at the proximal end of the rear box body; the speed change device includes a transmission shaft, a driven gear and at least two output gear groups, the driven gear is connected to the transmission shaft, and the driven gear is used for power input; the output gear group is connected to the transmission shaft and is arranged on both sides of the driven gear, and the output gear group is used for power output; the output gear group includes a movable gear group and a fixed gear group, the movable gear group is slidably connected to the transmission shaft so as to be able to move along the axial direction of the transmission shaft, and the fixed gear group is fixedly connected to the transmission shaft; A first transmission system is provided in the front housing, and a first output shaft is provided at the distal end of the front housing. The first transmission system can selectively cooperate with the speed change device to selectively drive the first output shaft to rotate. A second transmission system is provided in the rear housing, and a second output shaft is provided at the distal end of the rear housing. The second transmission system can selectively cooperate with the speed change device to selectively drive the second output shaft to rotate; A forward-rotating shift lever and a rearward-rotating shift lever, both of which are arranged on the rear box body; the forward-rotating shift lever is provided with a first shift fork, and the rearward-rotating shift lever is provided with a second shift fork, the first shift fork and the second shift fork are used to cooperate with the speed change device to realize switching between two-wheel drive and four-wheel drive.

2. The micro-tillage machine according to claim 1, characterized in that: The speed change device further includes a driving mechanism, an output end of the driving mechanism is engaged with the driven gear, so that the driven gear is driven to rotate by the driving mechanism.

3. The micro-tillage machine according to claim 2, characterized in that: The driving mechanism includes a driving gear, a connecting shaft and a transmission gear, one end of the connecting shaft is connected to the driving gear, the other end of the connecting shaft is connected to the transmission gear, and the transmission gear is meshed with the driven gear.

4. The micro-tillage machine according to claim 1, characterized in that: The movable gear set includes a first gear and a second gear, and the first gear and the second gear have different gear ratios; A connecting sleeve is provided between the first gear and the second gear. The connecting sleeve is slidably provided on the transmission shaft. An annular groove for cooperating with a shift fork is provided on the connecting sleeve so that the shift fork can be used to move the connecting sleeve to slide on the transmission shaft.

5. The micro-tillage machine according to claim 1, characterized in that: The fixed gear set includes a first fixed gear; It also includes a shift shaft, which is arranged on one side of the transmission shaft. A shift gear and a second fixed gear are provided on the shift shaft. The second fixed gear and the first fixed gear are engaged for transmission. The shift gear is slidably arranged on the shift shaft, and the second fixed gear is fixed on the shift shaft. A shift fork sleeve is provided on one side of the shift gear, and the shift fork sleeve is used to cooperate with another shift fork to shift the shift gear on the shift shaft through the other shift fork.

6. The micro-tillage machine according to claim 1, characterized in that: The first transmission system includes a chain transmission mechanism, which includes a front axle output gear and a transmission chain. The transmission chain is wound between the front axle output gear and the first output shaft to achieve torque transmission of the speed change device through the transmission chain.

7. The micro-tillage machine according to claim 1, characterized in that: The second transmission system includes a multi-stage gear transmission mechanism, which includes a plurality of gear shafts meshing with each other, wherein the gear shaft at the head end meshes with the speed change device, and the gear shaft at the tail end meshes with the second output shaft.

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