JPH0325121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc-type rotary tiller that performs tilling work by driving a disc-equipped rotary shaft.

[Conventional technology]

Conventionally, this type of disc-type rotary tiller is
For example, as disclosed in Japanese Utility Model Application No. 57-54201, it is of a center drive type, and a chain transmission case is arranged in the center.

[Problem to be solved by the invention]

This leaves some uncultivated land in the center,
A complicated mechanism is required to process residual tillage, and when power is transmitted to the left and right rotary shafts with discs via a universal joint, the rotary shaft becomes inconstant in speed depending on the angle of the universal joint. Tillage output is unstable. This is because when an appropriate gearing angle is set, this angle is large, and moreover, it is the transmission angle of the universal joint. Furthermore, since a large load is applied to the universal joint, sufficient consideration must be given to its structure and strength. In particular, the case and universal joint parts of the transmission chain come into direct contact with the soil, resulting in a shortened service life.

The present invention was made based on the above circumstances, and it is easy to treat the central uncultivated land area, alleviates the inconsistency of the rotary shaft, allows plowing under a stable load, and increases durability. An object of the present invention is to provide a disc-type rotary tiller.

[Means to solve the problem]

In order to achieve this object, the present invention provides a main frame with a transmission that is connected to the PTO shaft of the tractor and receives power transmission, and a disk that is arranged on the left and right sides of the main frame so that the gearing angle can be adjusted. A transmission system is provided at both outer ends of the rotary shaft with a disk so as to extend upwardly, and power is transmitted from the transmission system to the upper position of the transmission system via a universal joint. It is characterized in that when the angle is adjusted, the gearing angle and the angle of power transmission from the transmission to the rotary shaft are approximately equal.

[Effect]

With the above configuration, it is easy to remove residual tillage from the central uncultivated area, the power transmission to the rotary shaft is smooth and does not become uneven, and stable plowing work is performed without soil coming into contact with the transmission system.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, reference numeral 1 is attached to the rear of the tractor.
This transmission is equipped with an input shaft 1a at the front that is connected to the PTO shaft via a universal joint, etc., and is installed in the center of the main frame 2. The transmission 1 has output shafts 1b, 1b that protrude left and right, and one end of a universal joint 3 is pivotally connected to these output shafts. The universal joint 3 has a rod portion that is extendable and retractable, and the other end is pivotally connected to an input shaft 4a of a chain transmission system 4 that extends in the vertical direction. The chain case 4b of the chain transmission system 4 is:
It is fixed to the rear end of the swing frame 5, and the tip of the swing frame 5 is pivoted to the main frame 2 by a pivot shaft 6 in front of the mission 1. The chain case 4b extends downward and is provided with an output shaft 4c of the chain transmission system 4 at its lower part, to which a rotary shaft 8 having disks 7 mounted at a predetermined pitch is directly connected. The rotary shaft 8 has its inner end pivotally supported by a support arm 9 extending downward from the swing frame 5.

Further, a hydraulic cylinder 10 is suspended between the rear part of the main frame 2 and the chain transmission case 4b, and the cylinder 10 can be adjusted to extend or contract. That is, the hydraulic cylinder 10 is connected to a cylinder main body 10a whose one end is pivotally connected to a bracket 11 provided on the chain case 4b, and a piston that is slidably fitted into the cylinder main body 10a. The piston rod 10b is pivotally connected to the frame 2.

In such a configuration, power is transmitted from the PTO shaft to the transmission 1, from the transmission 1 to the chain transmission system 4 via the universal joint 3, and from the chain transmission system 4 to each rotary shaft 8. , the inner ends of each rotary shaft 8 can be approached as closely as possible, so that almost no uncultivated area remains in the center. Even if there is such uncultivated land, there is space for the rotating disk, coulter, claws, etc., so the uncultivated land can be easily processed, compared to the conventional center drive system. It's excellent.

In addition, depending on the soil quality, the gearing angle β can be appropriately selected and adjusted by applying hydraulic pressure to the hydraulic cylinder 10 and controlling the piston rod 10b to move forward and backward relative to the cylinder body 10. In this case, the transmission angle of the universal joint 3 is the difference between the angle α formed with the output shaft 1b of the mission 1 and the Guyang angle β,
In other words, the difference is slight, and the output can be transmitted to the chain transmission system at substantially constant speed. Therefore, the rotary shaft 8 is driven with a stable load. In particular, in this embodiment, the universal joint 3 is located above the rotary shaft 8, and the transmission system does not come into direct contact with the soil, increasing durability. Furthermore, since there is no influence of earth pressure on the transmission system, no extra strength measures are required.

〔Effect of the invention〕

As described in detail above, the present invention provides power from the transmission via the universal joint to the upper part of the power transmission system on both sides of the rotary shaft whose gearing angle can be adjusted, and from there powers the rotary shaft. Unlike the center drive system, since the system uses a transmission method, the uncultivated area in the center can be easily treated with residual tillage, either substantially or with the addition of a simple configuration. Furthermore, although the gearing angle can be adjusted, soil does not come into contact with the transmission system, so transmission can be performed reliably and durability can be improved. Furthermore, the rotational speed applied to the rotary shaft via the power transmission system provided at both ends of the fuselage is approximately constant even when the gearing angle is adjusted.
Tillage with a stable load is achieved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a rear view of the same, and FIG. 3 is a side view of the same. 1...Mission, 1a...Input shaft, 2...Main frame, 3...Universal joint, 4...
...Chain transmission system, 4a...Input shaft, 4b...Chain case, 4c...Output shaft, 5...Swing arm,
6... Pivot shaft, 7... Disc, 8... Rotary shaft, 9... Support arm, 10... Hydraulic cylinder,
10a...Cylinder, 10b...Piston rod, 11...Bracket.

Claims (1)

[Scope of Claims] 1. A main frame is provided with a transmission connected to a PTO shaft of a tractor to receive power transmission, and a rotary shaft with a disk is arranged on the left and right sides of the main frame so that the gearing angle can be adjusted. A transmission system is provided at both outer ends so as to extend upward, and power is transmitted from the transmission system to an upper position of the transmission system via a universal joint, and the gearing angle of the rotary shaft with the disc is adjusted. A disc-type rotary tiller characterized in that the gearing angle and the power transmission angle from the transmission to the rotary shaft are approximately equal to each other.