Gear transmission mechanism of four-wheel-drive mini-tiller

Abstract

The utility model provides a gear transmission mechanism of a four-wheel-drive mini-tiller. The gear transmission mechanism solves the problem that an existing mini-tiller is not suitable for the four-wheel-drive transportation working condition. The gear transmission mechanism of the four-wheel-drive mini-tiller comprises a transmission shaft, a first output shaft, a second output shaft, a first intermediate shaft and a gear shifting assembly, the first output shaft is in transmission connection with the transmission shaft, the first intermediate shaft is in transmission connection with the first output shaft, and the second output shaft is selectively in transmission connection with the transmission shaft or the first intermediate shaft through the gear shifting assembly. When the second output shaft is in transmission connection with the transmission shaft, the first output shaft and the second output shaft have different rotating speeds, and when the second output shaft is in transmission connection with the first intermediate shaft, the first output shaft and the second output shaft have the same rotating speed. The device has the advantages of four-wheel-drive transportation and ploughing working conditions, reasonable structural design and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro-tillage machines and relates to a gear transmission mechanism of 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 gear transmission mechanism of 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] The gear transmission mechanism of the four-wheel drive micro-tiller includes a transmission shaft, a first output shaft, a second output shaft, a first intermediate shaft and a shift assembly. The first output shaft is transmission-connected to the transmission shaft, the first intermediate shaft is transmission-connected to the first output shaft, and the second output shaft is selectively transmission-connected to the transmission shaft or the first intermediate shaft through the shift assembly. When the second output shaft is transmission-connected to the transmission shaft, the rotational speeds of the first output shaft and the second output shaft are different. When the second output shaft is transmission-connected to the first intermediate shaft, the rotational speeds of the first output shaft and the second output shaft are the same.

[0007] When the second output shaft is connected to the first intermediate shaft, the reduction ratio of the first output shaft outputting forward to the front travel wheel is equal to the reduction ratio of the second output shaft outputting backward to the rear travel wheel. When the tiller is moving, the speed of the front travel wheel driven by the first output shaft and the rear travel wheel driven by the second output shaft can be ensured to be the same.

[0008] When the tiller needs to use the tillage mode, the shift assembly is connected to the transmission shaft and the second output shaft. At this time, the power of the transmission shaft is transmitted to the second output shaft through the shift assembly. At this time, the second output shaft has a different rotation speed from the first output shaft. When the tiller needs to use the transport mode, the shift assembly is connected to the first intermediate shaft and the second output shaft. At this time, the power of the transmission shaft is transmitted to the second output shaft through the first output shaft and the first intermediate shaft in sequence. At this time, the second output shaft has the same rotation speed as the first output shaft.

[0009] In the gear transmission mechanism of the above-mentioned four-wheel drive micro-tiller, the shift assembly includes a first gear driven by a transmission shaft, a second gear coaxially arranged on the first intermediate shaft, and a toggle gear slidably sleeved on the second output shaft. When the toggle gear is transmission connected to the first gear, the toggle gear is disconnected from the second gear, and when the toggle gear is transmission connected to the second gear, the toggle gear is disconnected from the first gear.

[0010] The shifting gear moves axially along the second output shaft under the action of the shift fork, and can be respectively connected to the first gear and the second gear. When the shifting gear is connected to the first gear, the power of the transmission shaft is transmitted to the second output shaft via the first gear and the shifting gear. When the shifting gear is connected to the second gear, the power of the power output shaft is transmitted to the second output shaft via the first output shaft, the first intermediate shaft, the second gear and the shifting gear.

[0011] The gear transmission mechanism of the above-mentioned four-wheel drive micro-tiller also includes a second intermediate shaft connected to the power output shaft and a third intermediate shaft connected to the second intermediate shaft. The first gear is coaxially arranged on the third intermediate shaft, and the shifting gear can mesh with the first gear and the second gear respectively.

[0012] In the gear transmission mechanism of the above-mentioned four-wheel drive micro-tiller, there are at least two first gears, the outer diameters of the first gears are not equal, the shifting gear has a plurality of meshing teeth that can respectively mesh with different first gears, and the second gear can mesh with one of the meshing teeth.

[0013] Only one of the meshing teeth is involved in the meshing action at a time. Since there are at least two first gears with different outer diameters, when meshing with different meshing teeth, the speed of the second output shaft is different, thereby achieving multi-gear output.

[0014] In the gear transmission mechanism of the above-mentioned four-wheel drive micro-tiller, the end of the transmission shaft close to the second intermediate shaft is a gear shaft, and the second intermediate shaft is coaxially provided with a third gear, and the third gear is meshed with the gear shaft of the transmission shaft.

[0015] In the gear transmission mechanism of the above-mentioned four-wheel drive micro-tiller, a fourth gear is coaxially provided on the first output shaft, a fifth gear is coaxially provided on the first intermediate shaft, and the fifth gear is meshed with the fourth gear.

[0016] Compared with the prior art, the gear transmission mechanism of the four-wheel drive micro-tillage machine has the following advantages: it can combine four-wheel drive transportation and tillage working conditions; in the tillage mode, the rotation speed of the second output shaft is different from that of the first output shaft, and the tillage effect is good; in the transportation mode, the rotation speed of the second output shaft is the same as that of the first output shaft, realizing four-wheel drive, and the overall structural design is reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stepped cross-sectional view of the gear transmission mechanism.

[0018] Figure 2 It is another stepped cross-sectional view of the gear transmission mechanism.

[0019] Figure 3 Yes Figure 1 Stepped cross-section view of the structure when installed in the gearbox.

[0020] Figure 4 Yes Figure 2 Stepped cross-section view of the structure when installed in the gearbox.

[0021] In the figure, 1, transmission shaft; 2, first output shaft; 3, second output shaft; 4, first intermediate shaft; 5, first gear; 6, second gear; 7, shift gear; 8, second intermediate shaft; 9, third intermediate shaft; 10, meshing gear portion; 11, gear shaft; 12, third gear; 13, fourth gear; 14, fifth gear; 15, front box; 16, rear box. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1-4 The gear transmission mechanism of the four-wheel drive micro-tiller shown is installed in the gearbox of the riding micro-tiller. The gearbox of the micro-tiller includes a front box 15 and a rear box 16. The gear transmission mechanism includes a transmission shaft 1 rotatably installed in the front box 15 through a bearing and a first output shaft 2 rotatably installed in the front box 15 through a bearing. The second output shaft 3, the first intermediate shaft 4, the second intermediate shaft 8 and the third intermediate shaft 9 are rotatably installed in the rear box 16 through bearings. In this embodiment, the transmission shaft 1 is the input shaft for transmitting power from the front box 15 to the rear box 16.

[0024] like Figure 1 and Figure 3 As shown, the end of the transmission shaft 1 close to the second intermediate shaft 8 is a gear shaft 11, and the second intermediate shaft 8 is coaxially provided with a third gear 12, which meshes with the gear shaft 11 of the transmission shaft 1. Figure 1-4As shown, the first output shaft 2 is connected to the transmission shaft 1 through a gear set. Figure 2 and Figure 4 As shown, a fourth gear 13 is coaxially disposed on the first output shaft 2, and a fifth gear 14 is coaxially disposed on the first intermediate shaft 4, and the fifth gear 14 meshes with the fourth gear 13. Figure 1 As shown, the second intermediate shaft 8 is transmission-connected with the third intermediate shaft 9 via a gear shaft 11 .

[0025] The second output shaft 3 is selectively connected to the third intermediate shaft 9 or the first intermediate shaft 4 through a shift assembly. When the second output shaft 3 is connected to the third intermediate shaft 9, the rotational speeds of the first output shaft 2 and the second output shaft 3 are different. When the second output shaft 3 is connected to the first intermediate shaft 4, the rotational speeds of the first output shaft 2 and the second output shaft 3 are the same.

[0026] When the tiller needs to use the tillage mode, the shift assembly is connected to the transmission shaft 1 and the second output shaft 3. At this time, the power of the transmission shaft 1 is transmitted to the second output shaft 3 through the shift assembly. At this time, the second output shaft 3 has a different rotation speed from the first output shaft 2. When the tiller needs to use the transportation mode, the shift assembly is connected to the first intermediate shaft 4 and the second output shaft 3. At this time, the power of the transmission shaft 1 is transmitted to the second output shaft 3 through the first output shaft 2 and the first intermediate shaft 4 in sequence. At this time, the second output shaft 3 has the same rotation speed as the first output shaft 2.

[0027] like Figure 1-4 As shown, the shift assembly includes a first gear 5 coaxially arranged on the third intermediate shaft 9, a second gear 6 coaxially arranged on the first intermediate shaft 4, and a toggle gear 7 slidably sleeved on the second output shaft 3. The toggle gear 7 can engage with the first gear 5 and the second gear 6 respectively. When the toggle gear 7 engages with the first gear 5, the toggle gear 7 is disconnected from the second gear 6. When the toggle gear 7 engages with the second gear 6, the toggle gear 7 is disconnected from the first gear 5.

[0028] The toggle gear 7 moves axially along the second output shaft 3 under the action of the fork provided on the rear box 16, and can be respectively connected to the first gear 5 and the second gear 6. When the toggle gear 7 is connected to the first gear 5, the power of the transmission shaft 1 is transmitted to the second output shaft 3 via the first gear 5 and the toggle gear 7. When the toggle gear 7 is connected to the second gear 6, the power of the power output shaft is transmitted to the second output shaft 3 via the first output shaft 2, the first intermediate shaft 4, the second gear 6 and the toggle gear 7.

[0029] Specifically, Figure 1 As shown, there are three first gears 5, and the outer diameters of the first gears 5 are not equal. The three first gears 5 correspond to three gear positions respectively. Figure 2As shown, the shift gear 7 has three meshing tooth portions 10 which can respectively mesh with the first gear 5 of different gear positions, and the second gear 6 can mesh with one of the meshing tooth portions 10 to achieve three-gear output.

[0030] In the first gear, the first gear 5 with the smallest outer diameter meshes with the meshing tooth portion 10 with the largest outer diameter, and the speed of the second output shaft 3 is the lowest; in the second gear, the first gear 5 with the middle outer diameter meshes with the meshing tooth portion 10 with the middle outer diameter, and the speed of the second output shaft 3 is middle; in the third gear, the first gear 5 with the largest outer diameter meshes with the meshing tooth portion 10 with the smallest outer diameter, and the speed of the second output shaft 3 is the highest. In the running gear, one of the meshing tooth portions 10 (such as the meshing tooth portion 10 with the smallest outer diameter) meshes with the second gear 6, and the speed of the second output shaft 3 is the same as that of the first output shaft 2.

[0031] 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 gear transmission mechanism for a four-wheel drive micro-tillage machine, characterized in that: The invention comprises a transmission shaft (1), a first output shaft (2), a second output shaft (3), a first intermediate shaft (4) and a shift assembly, wherein the first output shaft (2) is transmission-connected to the transmission shaft (1), the first intermediate shaft (4) is transmission-connected to the first output shaft (2), and the second output shaft (3) is selectively transmission-connected to the transmission shaft (1) or the first intermediate shaft (4) through the shift assembly; when the second output shaft (3) is transmission-connected to the transmission shaft (1), the rotation speeds of the first output shaft (2) and the second output shaft (3) are different; when the second output shaft (3) is transmission-connected to the first intermediate shaft (4), the rotation speeds of the first output shaft (2) and the second output shaft (3) are the same.

2. The gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 1, characterized in that: The shift assembly comprises a first gear (5) driven by a transmission shaft (1), a second gear (6) coaxially arranged on a first intermediate shaft (4), and a shift gear (7) slidably sleeved on a second output shaft (3); when the shift gear (7) is in transmission connection with the first gear (5), the shift gear (7) is disconnected from the second gear (6); when the shift gear (7) is in transmission connection with the second gear (6), the shift gear (7) is disconnected from the first gear (5).

3. The gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 2, characterized in that: It also comprises a second intermediate shaft (8) drivingly connected to the power output shaft and a third intermediate shaft (9) drivingly connected to the second intermediate shaft (8); the first gear (5) is coaxially arranged on the third intermediate shaft (9); and the shifting gear (7) can mesh with the first gear (5) and the second gear (6) respectively.

4. The gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 2 or 3, characterized in that: The first gears (5) have at least two, the outer diameters of the first gears (5) are all unequal, the shifting gear (7) has a plurality of meshing tooth portions (10) that can respectively mesh with different first gears (5), and the second gear (6) can mesh with one of the meshing tooth portions (10).

5. The gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 3, characterized in that: One end of the transmission shaft (1) close to the second intermediate shaft (8) is a gear shaft (11), and a third gear (12) is coaxially provided on the second intermediate shaft (8), and the third gear (12) meshes with the gear shaft (11) of the transmission shaft (1).

6. The gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 1, characterized in that: A fourth gear (13) is coaxially arranged on the first output shaft (2), a fifth gear (14) is coaxially arranged on the first intermediate shaft (4), and the fifth gear (14) is meshed with the fourth gear (13).

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