Gearbox capable of adapting to various rotary tillage harrow structures

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a gearbox capable of being matched with various rotary tillage harrow structures. Comprising a first box body, a second box body, a rotating shaft, an input shaft arranged on the second box body and an output shaft arranged on the first box body, one end of the rotating shaft is located in the first box body and rotationally connected with the first box body, and the other end of the rotating shaft is located in the second box body and rotationally connected with the output shaft; the second box body rotates around the first box body with the rotating shaft as the rotating center, and a fastener used for fixing the second box body is arranged in the first box body so that the input shaft can be located on the left side or the right side of the plane where the symmetry plane of the first box body is located. The utility model provides a gear box capable of adapting to various rotary tillage harrow structures. The gear box can adapt to various rotary tillage harrow structures.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a gear box capable of adapting to a variety of rotary tillage harrow structures. Background Art

[0002] Agricultural production rotary tillers are tilling machines that work with tractors to complete plowing and harrowing operations. They are widely used in agricultural production due to their excellent soil crushing ability and the flatness of the ground after plowing. The rotary tiller installed on the rotary tiller can effectively chop up the root stubble underground, providing convenience for the seed drill operation, and thus creating good soil conditions for sowing. However, the traditional rotary tiller gearbox design has limitations. One gearbox can often only be adapted to one rotary tiller harrow structure, which greatly limits its scope of use. Utility Model Content

[0003] In view of the deficiency that the gearbox of the existing rotary tiller can only be adapted to one rotary tiller harrow structure, the purpose of the utility model is to provide a gearbox that can be adapted to multiple rotary tiller harrow structures.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gear box capable of adapting to a variety of rotary tiller structures, comprising a first housing, a second housing, a rotating shaft, an input shaft arranged on the second housing, and an output shaft arranged on the first housing, one end of the rotating shaft is located in the first housing and is rotatably connected to the first housing, the other end of the rotating shaft is located in the second housing and is rotatably connected to the output shaft, the second housing rotates around the first housing with the rotating shaft as the rotation center, and a fastener for fixing the second housing is provided in the first housing so that the input shaft is located on the left or right side of the plane where the symmetry plane of the first housing is located.

[0005] In this technical solution, the rotating shaft connects the first housing and the second housing, realizing flexible rotation between the two. The second housing can rotate freely around the first housing with the rotating shaft as the center. Fasteners are arranged in the first housing, which not only ensures the stability of the second housing, but also enables the input shaft to be flexibly adjusted to the left or right side of the plane where the symmetry plane of the first housing is located as required, so that the gearbox can easily cope with the installation requirements of various rotary tillage harrows, and has shown excellent adaptability in both structure and spatial layout.

[0006] The utility model is further configured as follows: the rotating shaft is connected to the first housing through a speed regulating mechanism, the speed regulating mechanism includes a driving shaft, a passive shaft and a shifting assembly, the driving shaft and the input shaft are coaxially arranged, the driving shaft is sleeved with a driving gear set, the passive shaft is sleeved with a passive gear set, and the shifting assembly pushes the driving gear set to slide along the axial direction of the driving shaft so that the driving gear set and the passive gear set are meshed. The coaxial arrangement of the driving shaft and the input shaft ensures direct and efficient transmission of power. The driving gear set sleeved on the driving shaft and the passive gear set on the passive shaft cooperate with each other to form a transmission. Through the precise control of the shifting assembly, the driving gear set can be pushed to slide along the axial direction of the driving shaft, thereby achieving perfect meshing with the passive gear set, so that the gear box can adapt to the different working requirements of various rotary tillage harrows, and also provides a smooth and flexible speed regulating function, making the operation more convenient and efficient. Whether in a complex farmland environment or under different operating requirements, the gear box can be quickly adjusted to the best working state through a simple shifting operation, greatly improving the operating efficiency and adaptability of the rotary tillage harrow.

[0007] The utility model is further configured as follows: the active gear set includes a first active tooth and a second active tooth, the passive gear set includes a first passive tooth and a second passive tooth, the first passive tooth and the second passive tooth are both connected to the passive shaft through a fixed key, the active shaft is provided with an involute spline, and the active gear set is slidably connected to the involute spline; when starting and running, the first active tooth and the first passive tooth are meshed and transmitted, or, after the shift assembly pushes the active gear set to slide along the active shaft, the second active tooth and the second passive tooth are meshed and transmitted. Through this configuration, the first active tooth and the second active tooth of the active gear set cooperate with the first passive tooth and the second passive tooth in the passive gear set, and through a carefully designed meshing mechanism, smooth transmission and efficient conversion of power are achieved. The first passive tooth and the second passive tooth are both firmly connected to the passive shaft through a fixed key, ensuring the stability and reliability of the transmission. The involute spline design on the active shaft cleverly realizes the sliding connection of the active gear set, which not only simplifies the structure, but also greatly improves the flexibility and precision of the transmission. When starting up, the first active tooth and the first passive tooth are first meshed and transmitted, ensuring that the gearbox can output power smoothly and efficiently in the initial stage. When it is necessary to adjust the transmission ratio or adapt to different working scenarios, the shift assembly comes into play, which can accurately push the active gear set to slide along the active shaft, so that the second active tooth and the second passive tooth are smoothly meshed, realizing seamless transmission switching. Whether in complex working environments that require continuous speed change or when facing the needs of different rotary harrow structures, the gearbox can adapt.

[0008] The utility model is further configured as follows: the shift assembly includes a wrench, a lever, a shift fork and a shift lever, the shift fork is connected to the lever, the wrench drives the lever to move the shift fork along the axial direction of the shift lever, and the shift fork drives the first active tooth to disengage from the first passive tooth and engage the second active tooth with the second passive tooth to form a shift. When the user needs to shift gears, he only needs to gently operate the wrench to drive the shift fork to move along the axial direction of the shift lever through the lever. Specifically, the shift fork will drive the first active tooth to disengage from the first passive tooth, and make the second active tooth and the second passive tooth precisely engage, thereby completing the shift action, which not only simplifies the shift steps, but also greatly improves the efficiency and stability of the shift. In addition, the flexibility of the shift assembly also enables the gearbox to adapt to the different working requirements of various rotary tillage harrow structures. Whether in an emergency situation where rapid shifting is required, or in the face of a complex and changeable farmland environment, the shift assembly can meet the needs of users with excellent performance and stability.

[0009] The utility model is further configured as follows: the shift lever is provided with two shift slots, the shift fork is provided with a spring and a steel ball, and the steel ball is arranged at one end of the spring close to the shift lever, so that the spring can press the steel ball into the corresponding shift slot after the gear shift. The shift lever is provided with two shift slots, which correspond to two gears respectively, providing clear positioning for the shift operation. The spring and the steel ball assembled on the shift fork constitute a locking system, wherein the steel ball is arranged at one end of the spring close to the shift lever, and when the gear is shifted to the correct gear, the spring will press the steel ball into the corresponding gear slot to achieve stable locking of the gear. Not only does it ensure the accuracy of the gear shift, but it also effectively prevents misoperation or accidental sliding of the gear, greatly enhancing the safety and stability of the gearbox operation. In addition, this gear locking mechanism also improves the operator's shifting experience. When shifting, the operator can clearly feel the change of the gear, and confirm whether the gear shift is successful through the feedback of the steel ball falling into the gear slot, such as hearing a "bang". This intuitive and accurate feedback mechanism makes operation more convenient and efficient, further improving the operating efficiency and operating comfort of agricultural machinery.

[0010] The utility model is further configured as follows: the first active tooth and the second active tooth are fixedly connected by a connecting plate, the diameter of the first active tooth is smaller than the diameter of the second active tooth, the diameter of the first passive tooth is larger than the diameter of the second passive tooth, and the sum of the diameters of the first active tooth and the first passive tooth is equal to the sum of the diameters of the second active tooth and the second passive tooth. The diameter of the first active tooth is designed to be smaller than the diameter of the second active tooth, while the diameter of the first passive tooth is larger than the diameter of the second passive tooth, and gear shifting is achieved by the difference in diameter. The sum of the diameters of the first active tooth and the first passive tooth is exactly equal to the sum of the diameters of the second active tooth and the second passive tooth, thereby ensuring that the center distance between the active shaft and the passive shaft always remains constant, thereby ensuring the smoothness and efficiency of the transmission.

[0011] The utility model is further configured as follows: the end of the passive shaft away from the first passive tooth is sleeved with a first bevel tooth, the output shaft is sleeved with a second bevel tooth, and the first bevel tooth and the second bevel tooth are meshed for transmission. The end of the passive shaft away from the first passive tooth is sleeved with the first bevel tooth, which converts the transmission direction of the gearbox so that the power can be smoothly transmitted to the output shaft. At the same time, the second bevel tooth sleeved on the output shaft is precisely meshed with the first bevel tooth, ensuring the accuracy and efficiency of the transmission.

[0012] The utility model is further configured as follows: a support seat is provided on one side of the first housing, the output shaft is connected to the support seat through the first tapered roller bearing and the second tapered roller bearing, the rotating shaft is connected to the first housing through the third tapered roller bearing and the fourth tapered roller bearing, and the input shaft is connected to the second housing through the fifth tapered roller bearing. A support seat is provided on one side of the first housing, which not only provides support for the output shaft, but also ensures the stability and accuracy of the output shaft during high-speed rotation through the connection between the first tapered roller bearing and the second tapered roller bearing. At the same time, the connection between the rotating shaft and the first housing, through the third tapered roller bearing and the fourth tapered roller bearing, realizes the smooth rotation of the rotating shaft, effectively reduces vibration and noise, and improves the overall performance of the gearbox. In addition, the connection between the input shaft and the second housing, through the fifth tapered roller bearing, ensures the stability and efficiency of the input shaft when transmitting power.

[0013] The utility model is further configured as follows: a box cover is provided at one end of the second box body, and the box cover is detachably connected to the second box body. The box cover is provided at one end of the second box body, which not only ensures the structural integrity of the gear box, but also provides great convenience for its daily maintenance and overhaul. The box cover is detachably connected to the second box body, and when necessary, the staff can easily open the box cover and directly access the key components inside the gear box.

[0014] The advantages of the utility model are: (1) the second housing can rotate freely around the first housing with the rotation axis as the center. The first housing is provided with fasteners, which not only ensures the stability of the second housing, but also enables the input shaft to be flexibly adjusted to the left or right side of the plane where the symmetry plane of the first housing is located as needed, so that the gear box can easily meet the installation requirements of various rotary tillage harrows; (2) the shift fork will drive the first active tooth to disengage from the first passive tooth, and make the second active tooth and the second passive tooth precisely mesh, thereby completing the gear shifting action, which not only simplifies the gear shifting steps, but also greatly improves the efficiency and stability of the gear shifting; (3) the steel ball is arranged at one end of the spring close to the gear lever. When the gear is shifted to the correct gear, the spring will press the steel ball into the corresponding gear slot to achieve stable locking of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;

[0017] Figure 3 It is a cross-sectional view of an angle of the utility model;

[0018] Figure 4 It is a cross-sectional view of the utility model from another angle;

[0019] Figure 5 It is a cross-sectional view of a shift assembly in the utility model at one angle;

[0020] Figure 6 It is a cross-sectional view of the shift assembly in the utility model from another angle.

[0021] In the figure: 11, first housing; 111, symmetry plane; 112, support seat; 12, second housing; 2, rotating shaft; 3, input shaft; 4, output shaft; 41, second bevel gear; 5, fastener; 6, speed regulating mechanism; 61, driving shaft; 62, driven shaft; 621, first bevel gear; 63, shift assembly; 631, wrench; 632, shift lever; 633, shift fork; 634, gear lever; 635, gear slot; 636, spring Spring; 637, steel ball; 64, driving gear set; 641, first driving tooth; 642, second driving tooth; 65, passive gear set; 651, first passive tooth; 652, second passive tooth; 71, first tapered roller bearing; 72, second tapered roller bearing; 73, third tapered roller bearing; 74, fourth tapered roller bearing; 75, fifth tapered roller bearing; 8, box cover; 91, first gear; 92, second gear. DETAILED DESCRIPTION

[0022] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] The utility model is further described below in conjunction with the accompanying drawings of the specification.

[0024] Embodiment 1:

[0025] Reference Figures 1 to 6 A gear box that can be adapted to a variety of rotary tillage harrow structures includes a first housing 11, a second housing 12, a rotating shaft 2, an input shaft 3 arranged on the second housing 12, and an output shaft 4 arranged on the first housing 11, one end of the rotating shaft 2 is located in the first housing 11 and is rotatably connected to the first housing 11, the other end of the rotating shaft 2 is located in the second housing 12 and is rotatably connected to the output shaft 4, the second housing 12 rotates around the first housing 11 with the rotating shaft 2 as the rotation center, and a fastener 5 for fixing the second housing 12 is provided in the first housing 11, so that the input shaft 3 is located on the left or right side of the plane where the symmetry plane 111 of the first housing 11 is located.

[0026] In this embodiment, the rotating shaft 2 connects the first housing 11 and the second housing 12, and realizes flexible rotation between the two. The second housing 12 can rotate freely around the first housing 11 with the rotating shaft 2 as the center. The fastener 5 is arranged in the first housing 11, which not only ensures the stability of the second housing 12, but also enables the input shaft 3 to be flexibly adjusted to the left or right side of the plane where the symmetry plane 111 of the first housing 11 is located as required, so that the gearbox can easily meet the installation requirements of various rotary tillage harrows, and has excellent adaptability in both structure and spatial layout.

[0027] Preferably, the fastener 5 is a screw.

[0028] In one embodiment of the present invention, Figure 2 , the input shaft 3 is located on the left side of the plane where the symmetry plane 111 of the first housing 11 is located.

[0029] In another embodiment of the present invention, Figure 1 , the input shaft 3 is located on the right side of the plane where the symmetry plane 111 of the first housing 11 is located.

[0030] refer to Figure 4The rotating shaft 2 is connected to the first housing 11 through a speed regulating mechanism 6. The speed regulating mechanism 6 includes a driving shaft 61, a passive shaft 62 and a shifting assembly 63. The driving shaft 61 is coaxially arranged with the input shaft 3. A driving gear set 64 is sleeved on the driving shaft 61, and a passive gear set 65 is sleeved on the passive shaft 62. The shifting assembly 63 pushes the driving gear set 64 to slide axially along the driving shaft 61, so that the driving gear set 64 meshes with the passive gear set 65. The coaxial arrangement of the driving shaft 61 and the input shaft 3 ensures direct and efficient transmission of power. The driving gear set 64 sleeved on the driving shaft 61 and the passive gear set 65 on the passive shaft 62 cooperate with each other to form a transmission. Through the precise control of the shifting assembly 63, the driving gear set 64 can be pushed to slide axially along the driving shaft 61, thereby achieving perfect meshing with the passive gear set 65, so that the gear box can adapt to the different working requirements of various rotary tillage harrows, and also provides a smooth and flexible speed regulation function, making the operation more convenient and efficient. Whether in a complex farmland environment or under different operating requirements, the gearbox can quickly adjust to the optimal working state through simple gear shifting operations, greatly improving the operating efficiency and adaptability of the rotary tillage harrow.

[0031] refer to Figure 4 , Figure 5The driving gear set 64 includes a first driving tooth 641 and a second driving tooth 642, and the passive gear set 65 includes a first passive tooth 651 and a second passive tooth 652. The first passive tooth 651 and the second passive tooth 652 are both connected to the passive shaft 62 through a fixed key. The active shaft 61 is provided with an involute spline, and the driving gear set 64 is slidably connected to the involute spline. When starting and running, the first driving tooth 641 and the first passive tooth 651 are meshed and transmitted, or, after the shift assembly 63 pushes the driving gear set 64 to slide along the active shaft 61, the second driving tooth 642 and the second passive tooth 652 are meshed and transmitted. The first driving tooth 641 and the second driving tooth 642 of the driving gear set 64 cooperate with the first passive tooth 651 and the second passive tooth 652 in the passive gear set 65, and through a carefully designed meshing mechanism, smooth transmission and efficient conversion of power are achieved. The first passive tooth 651 and the second passive tooth 652 are both firmly connected to the passive shaft 62 through a fixed key, ensuring the stability and reliability of the transmission. The involute spline design on the active shaft 61 realizes the sliding connection of the active gear set 64, which not only simplifies the structure, but also greatly improves the flexibility and accuracy of the transmission. When starting the operation, the first active tooth 641 and the first passive tooth 651 are first meshed and transmitted, ensuring that the gearbox can output power smoothly and efficiently in the initial stage. When it is necessary to adjust the transmission ratio or adapt to different working scenes, the shift assembly 63 comes into play. It can accurately push the active gear set 64 to slide along the active shaft 61, so that the second active tooth 642 and the second passive tooth 652 are smoothly meshed, realizing seamless switching of the transmission. Whether in a complex working environment that requires continuous speed change, or in the face of the needs of different rotary harrow structures, the gearbox can be adapted.

[0032] refer to Figure 5The shift assembly 63 includes a wrench 631, a lever 632, a shift fork 633 and a shift lever 634. The shift fork 633 is connected to the lever 632. The wrench 631 drives the lever 632 to move the shift fork 633 along the axial direction of the shift lever 634. The shift fork 633 drives the first active tooth 641 to disengage from the first passive tooth 651 and enables the second active tooth 642 to mesh with the second passive tooth 652 to form a shift. When the user needs to shift, he only needs to gently operate the wrench 631 to drive the shift fork 633 to move along the axial direction of the shift lever 634 through the lever 632. Specifically, the shift fork 633 drives the first active tooth 641 to disengage from the first passive tooth 651 and enables the second active tooth 642 to mesh with the second passive tooth 652 accurately, thereby completing the shift action, which not only simplifies the shift steps, but also greatly improves the efficiency and stability of the shift. In addition, the flexibility of the shift assembly 63 also enables the gearbox to adapt to the different working requirements of various rotary tillage harrow structures. Whether in emergency situations requiring rapid gear shifting or in the face of complex and changing farmland environments, the shift assembly 63 can meet the needs of users with excellent performance and stability.

[0033] In one embodiment of the present invention, reference Figure 6 , the shift lever 634 is provided with two shift slots 635, the shift fork 633 is provided with a spring 636 and a steel ball 637, the steel ball 637 is arranged at one end of the spring 636 close to the shift lever 634, so that the spring 636 can press the steel ball 637 into the corresponding shift slot 635 after the shift. The shift lever 634 is provided with two shift slots 635, corresponding to the first gear 91 and the second gear 92, respectively, providing clear positioning for the shift operation. The spring 636 and the steel ball 637 assembled on the shift fork 633 constitute a locking system, wherein the steel ball 637 is arranged at one end of the spring 636 close to the shift lever 634, when the gear is shifted to the correct gear, the spring 636 will press the steel ball 637 into the corresponding gear slot 635, realizing the stable locking of the gear. It not only ensures the accuracy of the shift, but also effectively prevents misoperation or accidental sliding of the gear, greatly enhancing the safety and stability of the gearbox operation. In addition, this gear lock mechanism also improves the operator's gear shifting experience. When shifting gears, the operator can clearly feel the gear change and confirm whether the gear shift is successful through the feedback of the steel ball 637 falling into the gear slot 635, such as hearing a "bang". This intuitive and accurate feedback mechanism makes the operation more convenient and efficient, and further improves the operating efficiency and operating comfort of agricultural machinery.

[0034] Preferably, reference Figure 3 , Figure 4, the first active tooth 641 and the second active tooth 642 are fixedly connected by a connecting plate, the diameter of the first active tooth 641 is smaller than the diameter of the second active tooth 642, the diameter of the first passive tooth 651 is larger than the diameter of the second passive tooth 652, and the sum of the diameters of the first active tooth 641 and the first passive tooth 651 is equal to the sum of the diameters of the second active tooth 642 and the second passive tooth 652. The diameter of the first active tooth 641 is designed to be smaller than the diameter of the second active tooth 642, while the diameter of the first passive tooth 651 is larger than the diameter of the second passive tooth 652, and the gear shifting is achieved by the difference in diameter. In addition, the sum of the diameters of the first active tooth 641 and the first passive tooth 651 is exactly equal to the sum of the diameters of the second active tooth 642 and the second passive tooth 652, which ensures that the center distance between the active shaft 61 and the passive shaft 62 is always kept constant, ensuring the stability and efficiency of the transmission.

[0035] In one embodiment of the present invention, reference Figure 3 The first bevel gear 621 is sleeved on one end of the driven shaft 62 away from the first driven gear 651, and the second bevel gear 41 is sleeved on the output shaft 4, and the first bevel gear 621 and the second bevel gear 41 are meshed for transmission. The first bevel gear 621 is sleeved on one end of the driven shaft 62 away from the first driven gear 651, which converts the transmission direction of the gearbox so that the power can be smoothly transmitted to the output shaft 4. At the same time, the second bevel gear 41 sleeved on the output shaft 4 is precisely meshed with the first bevel gear 621, ensuring the accuracy and efficiency of the transmission.

[0036] In one embodiment of the present invention, reference Figure 3 , Figure 4 , a support seat 112 is provided on one side of the first housing 11, the output shaft 4 is connected to the support seat 112 through the first tapered roller bearing 71 and the second tapered roller bearing 72, the rotating shaft 2 is connected to the first housing 11 through the third tapered roller bearing 73 and the fourth tapered roller bearing 74, and the input shaft 3 is connected to the second housing 12 through the fifth tapered roller bearing 75. The support seat 112 is provided on one side of the first housing 11, which not only provides support for the output shaft 4, but also ensures the stability and precision of the output shaft 4 during high-speed rotation through the connection between the first tapered roller bearing 71 and the second tapered roller bearing 72. At the same time, the connection between the rotating shaft 2 and the first housing 11, through the third tapered roller bearing 73 and the fourth tapered roller bearing 74, realizes the smooth rotation of the rotating shaft 2, effectively reduces vibration and noise, and improves the overall performance of the gearbox. In addition, the connection between the input shaft 3 and the second housing 12 is ensured by the fifth tapered roller bearing 75 , thereby ensuring the stability and high efficiency of the input shaft 3 when transmitting power.

[0037] refer to Figure 3, a cover 8 is provided at one end of the second housing 12, and the cover 8 is detachably connected to the second housing 12. The cover 8 is provided at one end of the second housing 12, which not only ensures the structural integrity of the gearbox, but also provides great convenience for its daily maintenance and overhaul. The cover 8 is detachably connected to the second housing 12, and when necessary, the staff can easily open the cover 8 and directly access the key components inside the gearbox.

[0038] It is understandable that when the second housing 12 needs to be rotated, the housing cover 8 needs to be removed, and the driving gear set 64 and the driven gear set 65 need to be removed, the screws need to be loosened, the second housing 12 needs to be rotated, and then the screws need to be tightened.

[0039] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.

Claims

1. A gear box that can adapt to a variety of rotary tillage harrow structures, characterized in that: The invention comprises a first housing, a second housing, a rotating shaft, an input shaft arranged on the second housing and an output shaft arranged on the first housing, one end of the rotating shaft is located in the first housing and is rotationally connected to the first housing, the other end of the rotating shaft is located in the second housing and is rotationally connected to the output shaft, the second housing rotates around the first housing with the rotating shaft as the rotation center, and a fastener for fixing the second housing is provided in the first housing so that the input shaft is located on the left or right side of the plane where the symmetry plane of the first housing is located.

2. The gear box capable of adapting to a variety of rotary tillage harrow structures according to claim 1 is characterized in that: The rotating shaft is connected to the first housing through a speed regulating mechanism, and the speed regulating mechanism includes a driving shaft, a driven shaft and a shifting assembly. The driving shaft and the input shaft are coaxially arranged, a driving gear set is sleeved on the driving shaft, and a driven gear set is sleeved on the driven shaft. The shifting assembly pushes the driving gear set to slide axially along the driving shaft so that the driving gear set is meshed with the driven gear set.

3. The gear box capable of adapting to various rotary tillage harrow structures according to claim 2 is characterized in that: The driving gear set includes a first driving tooth and a second driving tooth, and the passive gear set includes a first passive tooth and a second passive tooth. The first passive tooth and the second passive tooth are both connected to the passive shaft through a fixed key. The driving shaft is provided with an involute spline, and the driving gear set is slidably connected to the involute spline. During startup and operation, the first driving tooth meshes with the first passive tooth for transmission, or, after the shift assembly pushes the driving gear set to slide along the driving shaft, the second driving tooth meshes with the second passive tooth for transmission.

4. The gear box capable of adapting to various rotary tillage harrow structures according to claim 3 is characterized in that: The shift assembly includes a wrench, a shift rod, a shift fork and a shift rod, wherein the shift fork is connected to the shift rod, the wrench drives the shift rod to move the shift fork along the axial direction of the shift rod, and the shift fork drives the first active tooth to disengage from the first passive tooth and enables the second active tooth to mesh with the second passive tooth to form a shift.

5. The gear box capable of adapting to various rotary tillage harrow structures according to claim 4 is characterized in that: The shift lever is provided with two shift slots, the shift fork is provided with a spring and a steel ball, and the steel ball is arranged at one end of the spring close to the shift lever, so that the spring can press the steel ball into the corresponding shift slot after shifting.

6. A gear box capable of adapting to a variety of rotary tillage harrow structures according to claim 3, 4 or 5, characterized in that: The first active tooth and the second active tooth are fixedly connected by a connecting plate, the diameter of the first active tooth is smaller than the diameter of the second active tooth, the diameter of the first passive tooth is larger than the diameter of the second passive tooth, and the sum of the diameters of the first active tooth and the first passive tooth is equal to the sum of the diameters of the second active tooth and the second passive tooth.

7. The gear box capable of adapting to various rotary tillage harrow structures according to claim 6, characterized in that: The end of the driven shaft away from the first driven gear is sleeved with a first bevel gear, the output shaft is sleeved with a second bevel gear, and the first bevel gear and the second bevel gear are meshed for transmission.

8. The gear box capable of adapting to various rotary tillage harrow structures according to claim 7 is characterized in that: A support seat is provided on one side of the first housing, the output shaft is connected to the support seat via a first tapered roller bearing and a second tapered roller bearing, the rotating shaft is connected to the first housing via a third tapered roller bearing and a fourth tapered roller bearing, and the input shaft is connected to the second housing via a fifth tapered roller bearing.

9. A gear box capable of adapting to a variety of rotary tillage harrow structures according to claim 1, 2, 3, 4 or 5, characterized in that: A box cover is provided at one end of the second box body, and the box cover is detachably connected to the second box body.

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