JP2729337B2 - Tilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission system which is mounted on a rear part of a tractor via a three-point link mechanism and which is long to the left and right, such as a rotary soil crushing and scraping device, extending from a gear box to both left and right sides. The present invention relates to a tilling work machine that is configured to fold a working device portion including a rearward body.

[0002]

2. Description of the Related Art Conventionally, a long tilling machine, such as a rotary crusher / scraper, is mounted at the rear of a tractor through a three-point link mechanism, and is mounted on a tractor PTO shaft and from a tilling machine gearbox. Power is transmitted to the input shaft that protrudes forward, and the working equipment including the transmission system that extends to the left and right sides from the gear box is folded toward the rear of the machine so that it does not hinder movement or running outside the field. The tillage working machine is, for example,
No. 106, Japanese Utility Model Laid-Open No. 1-163907, Japanese Utility Model Laid-Open No. 2-1208, and the like. And
In these tilling implements of the prior art, as shown in FIG. 6, the folded direction of the working device portion to be folded is raised rearward with respect to the horizontal line. That is, FIG.
, The connecting portion C of the tilling machine B is mounted via a three-point link mechanism A provided at the rear of the tractor, not shown, and projects forward from the gearbox D of the cultivating machine B from the PTO shaft of the tractor. To the input shaft E, and a transmission system F extending from the gear box D to the left and right sides.
Is folded toward the rear of the fuselage around the substantially vertical hinge portion H, and the direction in which the work device portion G is folded rearward around the hinge portion H depends on the horizontal line. The device portion G is folded so as to be raised rearward.

[0003]

As in the above-described prior art tilling work machine, if the direction in which the working device portion G is folded rearward of the machine body is raised rearward with respect to the horizontal line,
When removing the tilling work machine B from the three-point link mechanism A of the tractor, when the tilling work machine B is lowered by the three-point link mechanism A, the lower end I of the working device portion G is grounded, and the three-point link mechanism is further extended. Even if A is lowered, the working device portion G
Can not be grounded at the rear end side. Therefore, at the connecting portion between the three-point link mechanism A and the connecting portion C of the tilling work machine B,
A large load is applied in the front-rear direction due to the weight of the tilling machine B, and a connecting portion C between the three-point link mechanism A and the cultivating machine B
Cannot be disconnected. For this reason, the length of the top link of the three-point link mechanism A is extended to ground the rear end of the working device portion G, or the working device portion G
The connection between the three-point link mechanism A and the connection part C of the tilling work machine B is released by providing a stand for supporting the rear end side of the tilling work machine B. The present invention has been made to solve the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for mounting a tilling implement at a rear portion of a tractor through a three-point link mechanism. In the tilling machine, the working device including the transmission system extending to the left and right sides from the gear box is transmitted to the input shaft projecting forward from the box, and the working device including the transmission system is folded rearward. It is characterized in that the folded direction of the portion is configured so as to fall backward with respect to the horizontal line.

[0005]

According to the above construction, the present invention performs the following operation because the folding direction of the working device portion to be folded is lower than the horizontal line. An automatic hitch arm is attached to the three-point link mechanism of the tractor, and the tilling work machine is mounted. When the mounting is released, the tractor can be automatically attached and detached. Therefore, it is not necessary to extend or shorten the length of the top link of the three-point link mechanism as in the related art. Also, no stand is required. The folding operation of the working device can be performed with a small force in a low position. In addition, when the working device portion is expanded, the rear portion of the working device portion is raised and easily spread by lifting the tilling work machine by the three-point link mechanism.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. 1 to 4, reference numeral 1 denotes a well-known three-point link mechanism, which is provided at the rear of a tractor (not shown) and includes a top link and a lower link. The connecting portion 4 of the tilling machine (rotary earth crusher in this embodiment) 3 is automatically connected to the auto hitch arm 2 so that the tilling machine 3 is mounted. Also,
Power is transmitted from the PTO shaft of the tractor to an input shaft 6 protruding forward from a gear box 5 of the tilling machine 3 via a universal joint, a transmission shaft, and the like, not shown. The working device (rotary soil crushing device) portions 8 and 8 including the transmission systems 7 and 7 extending to the left and right sides from the gear box 5
In the state of being connected by the connecting link 11, the hinge portion 9,
Folded toward the rear of the aircraft by human power around 9,
It can be expanded. The working device portions 8 and 8 are provided with a fold lock fitting 8a for locking the working device portion 8 in a folded state and work lock fittings 8b and 8b for locking the working device portion 8 in a spread working state. .

The end of the working device portion 8 on the gear box 5 side is extended so as to crush the lower side of the gear box 5 so that when the working device portion 8 is spread, both extended ends approach each other. Has become. Further, when the working device portion 8 is folded, the transmission systems 7, 7 are separated and the transmission is cut off, and when the working device portion 8 is expanded, the transmission systems 7, 7 are connected to be in a transmission state. Also, the working device portion 8 is equipped with a soil crushing rotor having a large number of soil crushing claws 10, 10... Mounted on a rotating shaft, and the direction in which the working device portion 8 is folded rearward around the hinge portion 9 is: The input center line, which is transmitted from the PTO shaft of the tractor to the input shaft 6 of the tilling work machine 3, and the working device portion 8, which is θ degrees (15 degrees in this embodiment), is lowered rearward and lowered rearward with respect to the horizontal line. It is designed to be folded.

When the tilling implement 3 is lowered by the three-point link mechanism 1 when removing the tilling implement 3 from the three-point link mechanism 1 of the tractor, the lower end 10a of the rear end 10a of the working unit 8 is first grounded. When the three-point link mechanism 1 is further lowered, the lower portion of the working device portion 8, that is, the entire lower portion of the working device portion 8 is grounded, and the auto hitch arm 2
, The connecting portion 4 of the tilling work machine 3 can be easily removed. The folding operation of the working device portion 8 can be performed with a small force in a state where the tilling work machine 3 is supported at a low position by the three-point link mechanism 1. Further, when the working device portion 8 is spread, the rear portion of the working device portion 8 is raised by raising the tilling work machine 3 by the three-point link mechanism 1, and can be easily spread.

In the tilling implement of the embodiment constructed as described above, when the tilling implement 3 is mounted on the three-point link mechanism 1 of the tractor and moves on a road or a narrow passage, the working device parts 8, 8 are used. In the state where is spread, it becomes an obstacle to traffic. Therefore, the working device portions 8 and 8 are rotated rearward from the hinge portions 9 and 9 and locked by the folding lock fittings 8a. At this time, the transmission systems 7, 7 are separated and the transmission is cut off. Further, when performing the crushing work, the folding lock fitting 8a is detached, the working device portion 8 is rotated and opened from the hinge portion 9 by human power, and locked by the working lock fittings 8b, 8b. At this time, the transmission systems 7, 7 are connected, and a power transmission state is established. Further, both extension ends of the working device portions 8 and 8 are close to each other to form a single crushing rotor. The folding operation of the working device portion 8 can be performed with a small force in a state where the tilling work machine 3 is supported at a low position by the three-point link mechanism 1.
In addition, when the working device portion 8 is spread, the rear portion of the working device portion 8 can be easily spread by raising the tilling work machine 3 by the three-point link mechanism 1.

An automatic hitch arm 2 is attached to the three-point link mechanism 1.
When the connecting portion 4 of the tilling work machine 3 is connected to the auto hitch arm 2 in a state in which the cultivation work is attached, the tilling work machine 3 (the working device portions 8, 8 may be in either a folded state or an expanded state). When the tractor is retracted on the ground and the upper hook of the auto-hitch arm 2 is hooked on the top mast 4a of the connecting portion 4 to raise the three-point link mechanism 1, the tilling work machine 3 is lifted and the auto-hitch arm 2 is lifted. A pair of left and right pin gripping portions at the bottom of the
4b are automatically engaged while approaching. When removing the tilling work machine 3 from the three-point link mechanism 1 of the tractor, when the tilling work machine 3 is lowered by the three-point link mechanism 1, first, the rear end lower part 10a of the working device portion 8 is grounded, and By lowering the point link mechanism 1, the lower end of the working device portion 8 is grounded, and the connection portion 4 of the tilling work machine 3 can be easily removed from the autohitch arm 2.

FIG. 5 shows a work of scraping and crushing soil by the tilling machine 3 of the present invention.
The tilling machine 3 is further lowered by the point link mechanism 1. The center line of the input shaft 6 at this time is inclined so as to fall forward by α degrees (7 degrees in this embodiment) with respect to the horizontal line. Also, the direction in which the working device portion 8 is folded rearward around the hinge portion 9 is inclined downward by β degrees (8 degrees in this embodiment) with respect to the horizontal line, and the inclination is shown in FIG. It is much slower than in the case. In addition, the inclination angle of the hinge portion 9 is naturally inclined backward more gradually than in the case of FIG. On the other hand, in the case of the hinge portion H of the conventional example, the state is almost vertical. Therefore, the working posture of the tilling machine 3 of the present invention is held in the backward inclination, which is better than the working posture of the conventional cultivating machine,
Good work can be performed.

[0012]

As described above, according to the tilling machine of the present invention, the folding direction of the working device to be folded is lowered backward with respect to the horizontal line, so that the following effects can be obtained. An automatic hitch arm is attached to the three-point link mechanism of the tractor, and the tilling work machine is mounted. When the mounting is released, one worker can automatically perform the attaching and detaching operation. Therefore, it is not necessary to extend or shorten the length of the top link of the three-point link mechanism when attaching and detaching the tilling implement to and from the three-point link mechanism of the tractor as in the related art. Also, there is no need to use a stand. The folding operation of the working device portion can be performed with a small force at a low position.
In addition, when the working device portion is expanded, the rear portion of the working device portion is raised by lifting the tilling work machine by the three-point link mechanism, and can be easily spread.

[Brief description of the drawings]

FIG. 1 is a side view of a working device according to an embodiment of the present invention in a folded state.

FIG. 2 is a plan view showing a state in which the working device is expanded.

FIG. 3 is a plan view showing a state where the working device is folded.

FIG. 4 is a rear view showing a state where the working device is expanded.

FIG. 5 (a) is a side view of a working state by a tilling implement of the present invention, and FIG. 5 (b) is a side view of a hinge portion of a conventional example.

FIG. 6 is a partial side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-point link mechanism of tractor 2 Auto hitch arm 3 Tilling machine 4 Connecting part 5 Gear box 6 Input shaft 7 Transmission system 8 Working device part 8a Folding lock fitting 8b Work lock fitting 9 Hinge part 10 Crushing soil 11 Linking link

Claims (1)

(57) [Claims] 1. A tilling implement is mounted on a rear part of a tractor via a three-point link mechanism, and power is transmitted from a tractor PTO shaft to an input shaft protruding forward from a gear box of the tilling implement. In a tilling work machine in which a working device portion including a transmission system extending to the left and right sides extending from a gear box can be folded toward the rear of the machine, a direction in which the working device portion to be folded is folded downward with respect to a horizontal line. A tilling work machine characterized by comprising.