Rotary cultivator high-low gear gearbox for walking tractor

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a high-gear and low-gear gearbox of a rotary cultivator for a walking tractor. Comprising a box body, an input shaft, an output shaft and an intermediate shaft, the input shaft, the output shaft and the intermediate shaft are installed in the box body through bearings, the input shaft, the output shaft and the intermediate shaft are arranged in parallel, the intermediate shaft is located between the input shaft and the output shaft, and a variable-speed shaft is arranged between the intermediate shaft and the input shaft and provided with a linkage gear set. The linkage gear set comprises a fixed large gear and a fixed small gear which are fixedly installed on the variable-speed shaft and rotate synchronously, and one of the fixed large gear and the fixed small gear is constantly meshed with the intermediate shaft gear. An input gear and a sliding gear set are coaxially installed on the input shaft, the sliding gear set is installed on the input shaft in an axial moving mode through a spline, and a sliding small gear matched with the fixed large gear and a sliding large gear matched with the fixed small gear are arranged on the sliding gear set. The gearbox is compact and reasonable in structure and short in transmission route and has high and low rotating speeds.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a high and low gear box for a rotary tiller of a walking tractor. Background Art

[0002] The walking tractor has a simple structure, low price and wide range of uses. It can be used to tow a bucket as a means of transporting goods, or it can be mounted with various agricultural tools for farmland operations. For example, Chinese Patent 2015210255280 discloses "A Walking Rotary Tiller for Agricultural Production", with the authorization announcement number CN205378500U. The walking rotary tiller uses a belt and a pulley to transmit the power of the engine to the gearbox, and then connects the gearbox to the transmission mechanism through a chain and a sprocket, thereby driving the rotary tilling working part to rotate. The power transmission route is long, and the control is complex and difficult. In addition, the rotary tillage operation in different plot environments requires a large change in the speed of the rotary tiller. The rotary tillage working part of the walking rotary tiller cannot adjust the speed independently, the speed change range is small, and the use is not flexible enough. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a high and low gear box for a rotary tiller used in a walking tractor, which has a compact structure, a short transmission route and a large speed adjustment range of a rotary tilling working part.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] The high and low gear gearbox of a rotary tiller for a walking tractor of the utility model comprises a box body and an input shaft, an output shaft and an intermediate shaft installed in the box body through bearings. The input shaft, output shaft and intermediate shaft are arranged parallel to each other and the intermediate shaft is located between the input shaft and the output shaft. The output shaft is fixedly mounted with an output shaft gear, the intermediate shaft gear is fixedly mounted on the intermediate shaft, the intermediate shaft gear is constantly meshed with the output shaft gear, a speed change shaft is arranged between the intermediate shaft and the input shaft, and a linkage gear set is installed on the speed change shaft, the linkage gear set comprises a fixed large gear and a fixed small gear fixedly mounted on the speed change shaft and rotating synchronously, one of the fixed large gear and the fixed small gear is constantly meshed with the intermediate shaft gear; an input gear and a sliding gear set are coaxially mounted on the input shaft, the sliding gear set is axially movably mounted on the input shaft through a spline, and the sliding gear set is provided with a sliding small gear adapted to the fixed large gear and a sliding large gear adapted to the fixed small gear.

[0006] Through this solution, the gear box has two speeds of high and low gear, which is conducive to expanding the adjustable range of the speed of the rotary tillage working part. It has a compact structure and a short transmission route.

[0007] Preferably, the box body is an elongated structure, and a flange is provided at the upper end of the box body for docking with the output end of the walking tractor gearbox, and the angle between the disk surface of the flange and the longitudinal axis of the box body is 30 to 50 degrees.

[0008] Through this solution, the box body can be conveniently connected directly to the output end of the walking tractor gearbox.

[0009] Preferably, the fixed large gear and the fixed small gear are double gears fixedly connected as one body via a sleeve.

[0010] Through this solution, the linkage gear set has an integrated structure with a high degree of standardization and is easy to assemble.

[0011] Preferably, the fixed large gear and the fixed small gear are spaced a certain distance apart and are respectively fixedly connected to the speed change shaft.

[0012] Through this solution, the linkage gear set has a split structure, which is beneficial to reducing production costs.

[0013] Preferably, the sliding pinion and the sliding gear are double gears fixedly connected as one body via a sleeve.

[0014] Through this solution, the sliding gear set has an integrated structure, a high degree of standardization, and is easy to assemble.

[0015] Preferably, the sliding pinion and the sliding gear are double gears fixedly connected as one body via side walls.

[0016] Through this solution, the sliding gear set has a compact integrated structure, which is compact and easy to assemble.

[0017] Due to the adoption of the above structure, the gearbox has a compact and reasonable structure, a short transmission route, and two speeds of high and low gear. When used on a walking tractor, it is combined with the speed adjustment of the walking tractor gearbox to expand the adjustable range of the speed of the rotary tillage working part and adapt to rotary tillage operations on different plots of land. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional view of an embodiment of the present invention.

[0019] Figure 2 It is a schematic cross-sectional view of another embodiment.

[0020] Figure 3 It is a schematic diagram of the side structure of the box. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings. Like components are denoted by like reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions away from the geometric center of a particular component.

[0022] like Figure 1 、 Figure 2 、 Figure 3 As shown, the rotary tiller high and low gear box for a walking tractor of the present invention comprises a box body 1 and an input shaft 2, an output shaft 3 and an intermediate shaft 4 mounted in the box body 1 through bearings. Figure 3 As shown, the housing 1 is an elongated structure. A flange 11 is provided at the upper end of the housing 1 for docking with the output terminal of the walking tractor's gearbox. The angle A between the surface of the flange 11 and the longitudinal axis of the housing 1 is 30 to 50 degrees. During use, the flange 11 on the housing 1 docks with the flange at the output terminal of the walking tractor's gearbox. The elongated housing 1 extends longitudinally, with its lower end used to mount the tillage working parts, such as the rotary blade shaft and rotary blades.

[0023] like Figure 1 、 Figure 2 As shown, the input shaft 2, intermediate shaft 4, and output shaft 3 are arranged parallel to each other from top to bottom, with the intermediate shaft 4 located between the input shaft 2 and the output shaft 3. An output shaft gear 31 is fixedly mounted on the output shaft 3. Both ends of the output shaft 3 extend outside the housing 1 and are used to mount rotary tillage components such as the rotary blade shaft and rotary blade. An intermediate shaft gear 41 is fixedly mounted on the intermediate shaft 4. The intermediate shaft gear 41 is constantly meshed with the output shaft gear 31 and is used to transmit power from the upper input shaft 2 to the rotary tillage component via the output shaft gear 31 and the output shaft 3. In this embodiment, there is only one intermediate shaft 4. As other embodiments of the present invention, two or three intermediate shafts 4 arranged in parallel can also be used. Power is transmitted downward in sequence through the intermediate shaft gears fixed to each intermediate shaft, and ultimately transmitted to the output shaft gear 31.

[0024] A speed change shaft 5 is disposed between the intermediate shaft 4 and the input shaft 2. A linkage gear set is mounted on the speed change shaft 5. The linkage gear set includes a fixed gearwheel 51 and a fixed pinion 52, which are fixedly mounted on the speed change shaft 5 and rotate synchronously. One of the fixed gearwheel 51 and the fixed pinion 52 is in constant mesh with the intermediate shaft gear 41. In this embodiment, the fixed pinion 52 is in constant mesh with the intermediate shaft gear 41. However, in other embodiments of the present invention, the fixed gearwheel 51 may also be in constant mesh with the intermediate shaft gear 41. When two or three intermediate shafts are arranged in parallel, the fixed pinion 52 is in constant mesh with the intermediate shaft gear on the topmost intermediate shaft. The fixed pinion 52, through the intermediate shaft gear with which it is in constant mesh, sequentially drives the rotation of the other intermediate shaft gears.

[0025] The linkage gear set can have two structural forms, such as Figure 1 As shown, the fixed large gear 51 and the fixed small gear 52 are double gears fixedly connected as one through a sleeve. This linkage gear set is an integrated structure, and when installing, the integrated linkage gear set only needs to be fixedly installed on the speed change shaft 5.

[0026] like Figure 2 As shown in FIG. 1 , as another embodiment of the present invention, the linkage gear set may also adopt a split structure, wherein the fixed large gear 51 and the fixed small gear 52 are spaced a certain distance apart and are respectively fixedly connected to the speed change shaft 5. This split linkage gear set requires that the fixed large gear 51 and the fixed small gear 52 be separately installed on the speed change shaft 5 during installation, which can facilitate the inspection and maintenance of the equipment.

[0027] The input shaft 2 is coaxially mounted with an input gear 6 and a sliding gear set. The input shaft 2 is located at the upper end of the housing 1, close to the flange 11, so that after the flange 11 is docked with the walking tractor gearbox, the input gear 6 is engaged with the output gear of the walking tractor gearbox, thereby transmitting the output power of the walking tractor gearbox to the input shaft 2 through the input gear 6.

[0028] The sliding gear set is axially movably mounted on the input shaft 2 via a spline. The sliding gear set is provided with a sliding pinion 71 adapted to the fixed large gear 51 and a sliding large gear 72 adapted to the fixed small gear 52 .

[0029] Sliding gear sets can also have two structural forms, such as Figure 1As shown, the sliding pinion 71 and the sliding gear 72 are double gears fixedly connected as one through a sleeve. The groove formed by the sleeve between the sliding pinion 71 and the sliding gear 72 is used to install the shift fork, which pushes the sliding gear set to move left and right. When the sliding gear set moves to the left, the sliding pinion 71 meshes with the fixed gear 51 in the linkage gear set to form a low-speed transmission, which transmits the power of the input shaft 2 downward through the linkage gear set, and then transmits it to the output shaft 3 through the intermediate shaft gear 41, driving the rotary tillage operation unit to work; the sliding gear set is located as shown in FIG. Figure 1 When in the middle position shown, the sliding pinion 71 and the sliding gear 72 are both separated from the linkage gear set, and are in a neutral state. There is no power output on the output shaft 3; when the sliding gear set moves to the right, the sliding gear 72 engages with the fixed pinion 52 in the linkage gear set, forming a high-speed transmission, transmitting the power of the input shaft 2 downward through the linkage gear set, and then transmitted to the output shaft 3 through the intermediate shaft gear 41, driving the rotary tillage operation part to work.

[0030] In another embodiment of the present invention, the sliding pinion 71 and the sliding gear 72 are dual-gears fixedly connected by side walls. The two gears of this sliding gear set fit snugly together, without a groove between them, resulting in a more compact structure. A slot for mounting a shift fork is provided on the outside of the sliding pinion 71 or the sliding gear 72. The shift fork pushes the sliding gear set left and right to achieve high and low gear changes.

[0031] Although some specific embodiments of the present invention have been described in detail above by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A high and low gear gearbox for a rotary tiller of a walking tractor, comprising a housing (1) and an input shaft (2), an output shaft (3), and an intermediate shaft (4) mounted in the housing (1) via bearings, wherein the input shaft (2), the output shaft (3), and the intermediate shaft (4) are arranged parallel to each other and the intermediate shaft (4) is located between the input shaft (2) and the output shaft (3), an output shaft gear (31) is fixedly mounted on the output shaft (3), an intermediate shaft gear (41) is fixedly mounted on the intermediate shaft (4), and the intermediate shaft gear (41) is constantly meshed with the output shaft gear (31), and the invention is characterized in that: A speed change shaft (5) is provided between the intermediate shaft (4) and the input shaft (2), and a linkage gear set is installed on the speed change shaft (5), wherein the linkage gear set comprises a fixed large gear (51) and a fixed small gear (52) fixedly installed on the speed change shaft (5) and rotating synchronously, and one of the fixed large gear (51) and the fixed small gear (52) is constantly meshed with the intermediate shaft gear (41); an input gear (6) and a sliding gear set are coaxially installed on the input shaft (2), and the sliding gear set is axially movably installed on the input shaft (2) via a spline, and the sliding gear set is provided with a sliding small gear (71) adapted to the fixed large gear (51) and a sliding large gear (72) adapted to the fixed small gear (52).

2. The high and low gear box for a rotary tiller for a walking tractor according to claim 1, characterized in that: The box body (1) is a long strip structure, and the upper end of the box body (1) is provided with a flange (11) for docking with the output end of the gearbox of the walking tractor, and the angle (A) between the disk surface of the flange (11) and the longitudinal axis of the box body (1) is 30 degrees to 50 degrees.

3. The high and low gear box for a rotary tiller used for a walking tractor according to claim 1 or 2, characterized in that: The fixed large gear (51) and the fixed small gear (52) are double gears fixedly connected as one body via a sleeve.

4. The high and low gear box for a rotary tiller for a walking tractor according to claim 1 or 2, characterized in that: The fixed large gear (51) and the fixed small gear (52) are spaced a certain distance apart and are respectively fixedly connected to the speed change shaft (5).

5. The high and low gear box for a rotary tiller used for a walking tractor according to claim 1 or 2, characterized in that: The sliding small gear (71) and the sliding large gear (72) are double gears fixedly connected as one body via a sleeve.

6. The high and low gear box for a rotary tiller used for a walking tractor according to claim 1 or 2, characterized in that: The sliding small gear (71) and the sliding large gear (72) are double gears fixedly connected as one body via side walls.

Images