Transmission case of four-wheel drive mini-tiller

Abstract

The utility model provides a transmission case of a four-wheel-drive mini-tiller. The transmission case solves the problem that an existing mini-tiller cannot have the four-wheel-drive transportation working condition and the ploughing working condition at the same time. The gearbox comprises a front box and a rear box, a first output shaft and a second output shaft are rotationally arranged in the front box, the second output shaft is in transmission connection with the first output shaft, a first middle shaft, a second middle shaft, a third middle shaft and a third output shaft are rotationally arranged in the rear box, the first middle shaft is in transmission connection with the second output shaft, and the second middle shaft is in transmission connection with the first output shaft. The third intermediate shaft is in transmission connection with the second intermediate shaft, the third output shaft is selectively in transmission connection with the third intermediate shaft or the first intermediate shaft through a first gear shifting assembly arranged in the rear box, and when the third output shaft is in transmission connection with the third intermediate shaft, the rotating speed of the second output shaft is different from that of the third output shaft. When the third output shaft is in transmission connection with the first intermediate shaft, the second output shaft and the third output shaft have the same rotating speed, and the four-wheel-drive transmission mechanism has the working conditions of four-wheel-drive transportation and ploughing.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro-tillage machines and relates to a transmission box for a four-wheel drive micro-tillage machine. Background Art

[0002] At present, agricultural tillage machines are generally used for tilling land or weeding. Except for the spring and autumn seasons, they are basically idle at other times. During agricultural activities, the tillage machines often need to be transported. The output speed of the rear travel box of the tillage machine is low and is responsible for walking, while the output speed of the front travel box of the tillage machine is high and is responsible for the work of the cutter. Due to the difference in the output speeds of the front and rear, it is not suitable for four-wheel drive transportation conditions.

[0003] However, existing small agricultural four-wheel transport vehicles generally use front-wheel drive or rear-wheel drive, and generally cannot achieve four-wheel drive; and the front and rear output speeds of the full-time four-wheel drive system of known vehicles (such as off-road vehicles) are the same, which cannot meet the working requirements of the micro-tiller with high speed at the front and low speed at the back, and therefore are not suitable for arable land conditions. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a transmission box for a four-wheel drive micro-tillage machine which can realize both four-wheel drive transportation and tillage working conditions.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A transmission box for a four-wheel drive micro-tillage machine comprises a front box and a rear box, wherein a first output shaft and a second output shaft are rotatably arranged in the front box, wherein the second output shaft is connected to the first output shaft in a transmission manner, wherein a first intermediate shaft, a second intermediate shaft, a third intermediate shaft and a third output shaft are rotatably arranged in the rear box, wherein the first intermediate shaft is connected to the second output shaft in a transmission manner, wherein the second intermediate shaft is connected to the first output shaft in a transmission manner, wherein the third intermediate shaft is connected to the second intermediate shaft in a transmission manner, wherein the third output shaft is selectively connected to the third intermediate shaft or the first intermediate shaft in a transmission manner through a first shift assembly arranged in the rear box, wherein when the third output shaft is connected to the third intermediate shaft in a transmission manner through the first shift assembly, the speeds of the second output shaft and the third output shaft are different, and when the third output shaft is connected to the first intermediate shaft in a transmission manner through the first shift assembly, the speeds of the second output shaft and the third output shaft are the same. When the third output shaft is connected to the first intermediate shaft in a transmission manner through the first shift assembly, the transmission ratio of the second output shaft outputting forward to the front travel wheel is equal to the transmission ratio of the third output shaft outputting backward to the rear travel wheel, and the micro-tillage machine can ensure that the speed of the front travel wheel driven by the second output shaft is the same as the speed of the rear travel wheel driven by the third output shaft when traveling.

[0007] When the micro-tillage machine needs to use the tillage mode, the third intermediate shaft and the third output shaft are connected by transmission through the first shift assembly. At this time, the power of the first output shaft is transmitted to the third output shaft through the second intermediate shaft, the third intermediate shaft and the first shift assembly. The rotation speed of the third output shaft is different from that of the second output shaft, which is suitable for the tillage working condition. When the micro-tillage machine needs to use the transportation mode, the first intermediate shaft and the third output shaft are connected by transmission through the first shift assembly. At this time, the power of the first output shaft is transmitted to the third output shaft through the second output shaft, the first intermediate shaft and the first shift assembly in sequence. The rotation speed of the third output shaft is the same as that of the second output shaft, which is suitable for the transportation working condition.

[0008] In the above-mentioned four-wheel drive micro-tiller transmission box, the first shift assembly includes a first gear coaxially arranged on the first intermediate shaft, at least two second gears coaxially arranged on the third intermediate shaft, and a first shift sleeve slidably arranged on the third output shaft. The outer diameters of the second gears are not equal. The first shift sleeve has a plurality of meshing teeth that can respectively mesh with different second gears, and the first gear can mesh with one of the meshing teeth.

[0009] In the above-mentioned four-wheel drive micro-tiller transmission box, there are three second gears: a first gear gear, a second gear gear and a third gear gear, and there are three meshing tooth portions: a first gear tooth portion that can mesh with the first gear gear, a second gear tooth portion that can mesh with the second gear gear and a third gear tooth portion that can mesh with the third gear gear, and the first gear can mesh with the third gear tooth portion.

[0010] The outer diameter of the first gear gear is smaller than that of the second gear gear, and the outer diameter of the second gear gear is smaller than that of the third gear gear. When the first gear tooth portion is meshed with the first gear gear, the remaining teeth do not participate in the meshing. At this time, the third output shaft is the first gear output. When the second gear tooth portion is meshed with the second gear gear, the remaining teeth do not participate in the meshing. At this time, the third output shaft is the second gear output. When the third gear tooth portion is meshed with the third gear gear, the remaining teeth do not participate in the meshing. At this time, the third output shaft is the third gear output. When the third gear tooth portion is meshed with the first gear, the remaining teeth do not participate in the meshing. At this time, the third output shaft is the traveling gear output.

[0011] In the above-mentioned four-wheel drive micro-tiller transmission box, a reverse gear shaft and a second shift assembly that are rotatably connected to the second output shaft are provided in the front box, and the first output shaft is selectively connected to the second output shaft or the reverse gear shaft under the action of the second shift assembly.

[0012] When the first output shaft is connected to the second output shaft by the second shift assembly, the second output shaft is in forward gear output; when the first output shaft is connected to the reverse gear shaft by the second shift assembly, the second output shaft is in reverse gear output.

[0013] In the above-mentioned four-wheel drive micro-tiller transmission box, the second shift assembly includes a fourth gear coaxially arranged on the second output shaft, a fifth gear coaxially arranged on the reverse gear shaft, and a second shift sleeve slidably arranged on the first output shaft, and the second shift sleeve is provided with a transmission tooth portion that can selectively engage with the fourth gear or the fifth gear.

[0014] A shift fork is provided in the front box for shifting the second shift sleeve to move axially. When the transmission tooth portion is meshed with the fourth gear, the transmission tooth portion is disengaged from the fifth gear, and the second output shaft is in forward gear output; when the transmission tooth portion is meshed with the fifth gear, the transmission tooth portion is disengaged from the fourth gear, and the second output shaft is in reverse gear output.

[0015] In the above-mentioned four-wheel drive micro-tiller transmission box, the fourth gear is two: a fast gear and a slow gear, the outer diameter of the slow gear is larger than the outer diameter of the fast gear, the transmission tooth part is two: a fast tooth part that can mesh with the fast gear and a slow tooth part that can mesh with the slow gear, and the fifth gear can mesh with the slow tooth part.

[0016] The second output shaft can realize forward gear output of both fast and slow gears, and can also realize reverse gear output, and only one of the fast gear portion and the slow gear portion is involved in meshing each time.

[0017] Compared with the prior art, the transmission box of the four-wheel drive micro-tillage machine has the following advantages:

[0018] Due to the provision of the first shift assembly and the second shift assembly, the third output shaft can output six forward gears, and the second output shaft can output two forward gears and one reverse gear. The cooperation of the two can enable the micro-tillage machine to adapt to various farming needs. The structure can also realize synchronous and unidirectional output of the third output shaft and the second output shaft, meeting the four-wheel drive requirements of the micro-tillage machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the connection between the transmission box and the travel box of a four-wheel drive micro-tillage machine.

[0020] Figure 2 It is a stepped cross-sectional view of the front box and the rear box provided by the utility model.

[0021] Figure 3 It is another stepped cross-sectional view of the front box and the rear box provided by the utility model.

[0022] In the figure, 1, front box; 2, rear box; 3, first output shaft; 4, second output shaft; 5, first intermediate shaft; 6, second intermediate shaft; 7, third intermediate shaft; 8, third output shaft; 9, first gear; 10, first shift sleeve; 11, first gear; 12, second gear; 13, third gear; 14, first gear gear; 15, second gear gear; 16, third gear gear; 17, second shift sleeve; 18, fast gear; 19, slow gear; 20, fast gear; 21, slow gear; 22, travel box; 23, universal joint shaft; 24, vertical shaft; 25, driving gear; 26, driven gear. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 The four-wheel drive micro-tillage machine transmission box shown is used for a riding micro-tillage machine, including a front box 1, a rear box 2 and a walking box 22. A first output shaft 3, a second output shaft 4 and a reverse gear shaft (not shown in the figure) are rotatably provided in the front box 1 through bearings. The first output shaft 3, the reverse gear shaft and the second output shaft 4 are parallel. The first output shaft 3 is connected to the diesel engine, and the reverse gear shaft is connected to the second output shaft 4 through a gear set. The second output shaft 4 is connected to the longitudinal output shaft through a bevel gear. The first output shaft 3 is selectively connected to the second output shaft 4 or the reverse gear shaft under the action of the second shift assembly.

[0025] When the first output shaft 3 is connected to the second output shaft 4 by the second shift assembly, the second output shaft 4 is in forward gear output; when the first output shaft 3 is connected to the reverse gear shaft by the second shift assembly, the second output shaft 4 is in reverse gear output.

[0026] like Figure 2 and Figure 3 As shown, the second shift assembly includes a fourth gear coaxially arranged on the second output shaft 4, a fifth gear coaxially arranged on the reverse shaft, and a second shift sleeve 17 slidably arranged on the first output shaft 3, and the second shift sleeve 17 is provided with a transmission tooth portion that can selectively mesh with the fourth gear or the fifth gear.

[0027] A shift fork is provided in the front box 1 for shifting the second shift sleeve 17 to move axially. When the transmission tooth portion is engaged with the fourth gear, the transmission tooth portion is disengaged from the fifth gear, and the second output shaft 4 is in forward gear output; when the transmission tooth portion is engaged with the fifth gear, the transmission tooth portion is disengaged from the fourth gear, and the second output shaft 4 is in reverse gear output.

[0028] Specifically, Figure 2 and Figure 3As shown, there are two fourth gears: a fast gear 18 and a slow gear 19, the outer diameter of the slow gear 19 is larger than the outer diameter of the fast gear 18, there are two transmission tooth portions: a fast tooth portion 20 that can mesh with the fast gear 18 and a slow tooth portion 21 that can mesh with the slow gear 19, and the fifth gear can mesh with the slow tooth portion 21.

[0029] The second output shaft 4 can realize forward gear output of two gears, fast and slow, and only one of the fast gear portion 20 and the slow gear portion 21 is involved in meshing each time.

[0030] like Figure 1-3 As shown, a first intermediate shaft 5, a second intermediate shaft 6, a third intermediate shaft 7 and a third output shaft 8 are rotatably provided in the rear box 2 through bearings, and the first intermediate shaft 5 is transmission-connected with the second output shaft 4 through a gear set. Specifically, a driving gear 25 is coaxially provided on the second output shaft 4, and a driven gear 26 is coaxially provided on the first intermediate shaft 5, and the driving gear 25 is meshed with the driven gear 26. The second intermediate shaft 6 is transmission-connected with the first output shaft 3 through a gear set, and the third intermediate shaft 7 is transmission-connected with the second intermediate shaft 6 through a gear set. The third output shaft 8 is selectively transmission-connected with the third intermediate shaft 7 or the first intermediate shaft 5 through a first shifting assembly provided in the rear box 2. When the third output shaft 8 is transmission-connected with the third intermediate shaft 7 through the first shifting assembly, the rotation speeds of the second output shaft 4 and the third output shaft 8 are different, and when the third output shaft 8 is transmission-connected with the first intermediate shaft 5 through the first shifting assembly, the rotation speeds of the second output shaft 4 and the third output shaft 8 are the same.

[0031] When the micro-tillage machine needs to use the tillage mode, the third intermediate shaft 7 is connected to the third output shaft 8 through the first shift assembly. At this time, the power of the first output shaft 3 is transmitted to the third output shaft 8 through the second intermediate shaft 6, the third intermediate shaft 7 and the first shift assembly. The rotation speed of the third output shaft 8 is different from that of the second output shaft 4, which is suitable for the tillage condition. When the micro-tillage machine needs to use the transportation mode, the first intermediate shaft 5 is connected to the third output shaft 8 through the first shift assembly. At this time, the power of the first output shaft 3 is transmitted to the third output shaft 8 through the second output shaft 4, the first intermediate shaft 5 and the first shift assembly in turn. The rotation speed of the third output shaft 8 is the same as that of the second output shaft 4, which is suitable for the transportation condition.

[0032] like Figure 2 and Figure 3As shown, the first shift assembly includes a first gear 9 coaxially arranged on the first intermediate shaft 5, three second gears coaxially arranged on the third intermediate shaft 7, and a first shift sleeve 10 slidably sleeved on the third output shaft 8. The three second gears are: a first gear 11, a second gear 12 and a third gear 13. The outer diameter of the first gear 11 is smaller than the outer diameter of the second gear 12, and the outer diameter of the second gear 12 is smaller than the outer diameter of the third gear 13. The first shift sleeve 10 has three meshing teeth that can respectively mesh with different second gears: a first gear tooth portion 14 that can mesh with the first gear 11, a second gear tooth portion 15 that can mesh with the second gear 12, and a third gear tooth portion 16 that can mesh with the third gear 13. The first gear 9 can mesh with the third gear tooth portion 16.

[0033] A shift fork is provided in the rear box 2 to drive the first shift sleeve 10 to move axially. When the first gear tooth portion 14 is meshed with the first gear gear 11, the remaining teeth are not involved in the meshing, and the third output shaft 8 is in the first gear output; when the second gear tooth portion 15 is meshed with the second gear gear 12, the remaining teeth are not involved in the meshing, and the third output shaft 8 is in the second gear output; when the third gear tooth portion 16 is meshed with the third gear gear 13, the remaining teeth are not involved in the meshing, and the third output shaft 8 is in the third gear output; when the third gear tooth portion 16 is meshed with the first gear 9, the remaining teeth are not involved in the meshing, and the third output shaft 8 is in the traveling gear output.

[0034] A vertical shaft 24 is rotatably provided in the travel box 22 through a bearing, and the output end of the third output shaft 8 is transmission-connected to the vertical shaft 24 through a universal joint shaft 23 and a bevel gear set. When the third gear tooth portion 16 is meshed with the first gear 9, the reduction ratio of the front end of the second output shaft 4 transmitted to the front output wheel axle of the micro-tiller is the same as the reduction ratio of the third output shaft 8 transmitted to the rear output wheel axle of the micro-tiller. When the micro-tiller is traveling, it can ensure that the travel wheels on the front output shaft and the travel wheels on the rear output shaft have the same speed.

[0035] In order to achieve braking, Figure 1 As shown, a fixed friction disk located above the vertical shaft is fixed in the travel box 22, a movable friction disk is slidably sleeved on the vertical shaft 24, a return spring is arranged between the fixed friction disk and the movable friction disk, and a shift fork for shifting the movable friction disk for axial movement is arranged in the travel box 22. When the shift fork shifts the movable friction disk so that the movable friction disk contacts the fixed friction disk, the vertical shaft 24 can be braked. When the shift fork is released, the movable friction disk returns to its original position downward under the action of the return spring.

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A transmission box for a four-wheel drive micro-tillage machine, characterized in that: The invention comprises a front box (1) and a rear box (2), wherein a first output shaft (3) and a second output shaft (4) are rotatably arranged in the front box (1), and the second output shaft (4) is drivingly connected to the first output shaft (3); and a first intermediate shaft (5), a second intermediate shaft (6), a third intermediate shaft (7) and a third output shaft (8) are rotatably arranged in the rear box (2), and the first intermediate shaft (5) is drivingly connected to the second output shaft (4), the second intermediate shaft (6) is drivingly connected to the first output shaft (3), and the third intermediate shaft (7) is drivingly connected to the second output shaft (8). The third output shaft (8) is selectively connected to the third intermediate shaft (7) or the first intermediate shaft (5) through a first shift assembly arranged in the rear box (2); when the third output shaft (8) is connected to the third intermediate shaft (7) through the first shift assembly, the rotation speeds of the second output shaft (4) and the third output shaft (8) are different; when the third output shaft (8) is connected to the first intermediate shaft (5) through the first shift assembly, the rotation speeds of the second output shaft (4) and the third output shaft (8) are the same.

2. The transmission box for the four-wheel drive micro-tillage machine according to claim 1, characterized in that: The first shift assembly comprises a first gear (9) coaxially arranged on a first intermediate shaft (5), at least two second gears coaxially arranged on a third intermediate shaft (7), and a first shift sleeve (10) slidably arranged on a third output shaft (8), the outer diameters of the second gears are all unequal, the first shift sleeve (10) has a plurality of meshing teeth that can respectively mesh with different second gears, and the first gear (9) can mesh with one of the meshing teeth.

3. The transmission box of the four-wheel drive micro-tillage machine according to claim 2, characterized in that: The second gears are three: a first gear (11), a second gear (12) and a third gear (13); the meshing tooth portions are three: a first gear tooth portion (14) that can mesh with the first gear (11), a second gear tooth portion (15) that can mesh with the second gear (12) and a third gear tooth portion (16) that can mesh with the third gear (13); and the first gear (9) can mesh with the third gear tooth portion (16).

4. The transmission box for a four-wheel drive micro-tillage machine according to claim 1, 2 or 3, characterized in that: A reverse gear shaft and a second shift assembly which are rotatably connected to the second output shaft (4) are provided in the front box (1); the first output shaft (3) is selectively connected to the second output shaft (4) or the reverse gear shaft under the action of the second shift assembly.

5. The transmission box for the four-wheel drive micro-tillage machine according to claim 4, characterized in that: The second shift assembly comprises a fourth gear coaxially arranged on the second output shaft (4), a fifth gear coaxially arranged on the reverse gear shaft, and a second shift sleeve (17) slidably arranged on the first output shaft (3), wherein the second shift sleeve (17) is provided with a transmission tooth portion that can selectively mesh with the fourth gear or the fifth gear.

6. The transmission box for the four-wheel drive micro-tillage machine according to claim 5, characterized in that: The fourth gear comprises two gears: a fast gear (18) and a slow gear (19); the outer diameter of the slow gear (19) is larger than the outer diameter of the fast gear (18); the transmission tooth portions comprise two gears: a fast tooth portion (20) capable of meshing with the fast gear (18) and a slow tooth portion (21) capable of meshing with the slow gear (19); and the fifth gear can mesh with the slow tooth portion (21).

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