JPH0974803A - Rear cover for rotary tilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reduction in sensitivity of an automatic rotary caused by the twisting of a flexible member part and accumulation of soil at the inside of the flexible member part in a constitution in which the rear cover of a rotary tilling device is longitudinally divided into two parts of a front rear cover and a back rear cover and both the rear covers are connected by the flexible member part. SOLUTION: A coupling link 22 is laid between a front rear cover 10 and a back rear cover 11. A connecting part between the coupling link 22 and either of the front rear cover 10 and the back rear cover 11 is linked at one pivoting point. Another connecting part between the coupling link and the other rear cover is linked by two pivoting points and at least one of the pivoting points is equipped with a flexible part. The back rear cover 11 is free in the lowering direction based on the front rear cover 10 but is controlled in a lifting direction by the flexible member to constitute both the rear covers so as to integrally move them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rear cover provided at a rear part of a tilling cover which covers an upper part of a rotation path of a tilling claw of a rotary tiller.

[0002]

2. Description of the Related Art The rear cover of a conventional rotary cultivator is normally made of a rigid body such as a steel plate so as to be leveled after cultivating. Between the back of the cover and the back cover,
Alternatively, a technique in which a flexible plate body such as rubber is interposed in the front-rear halfway portion of the rear cover so that the flexible member is bent and leveled substantially horizontally when cultivating on a sloped ground is known. ing. For example, Japanese Utility Model Publication No. 57-41008 and Japanese Utility Model Publication No.
The technology is disclosed in Japanese Laid-Open Patent Application No. 117,914, Japanese Utility Model Laid-Open No. 62-36612, and Japanese Patent Laid-Open No. 3-262401.

[0003]

In the above-mentioned prior art, when the rotation amount of the rear cover is detected at the time of plowing work and an attempt is made to control the plowing depth to a constant level (auto rotary), the technique disclosed in Japanese Patent Laid-Open No. 3-262401 is disclosed. As described above, it is necessary to connect the front and rear flexible front and rear rear covers with a link or the like. However, since it is connected by left and right links or rods, and in order to improve the leveling accuracy even on sloping ground, each connecting part is connected by one pivot, so twisting is likely to occur and the sensitivity of the autorotary Was not so good. Further, as shown in FIG. 5, when soil is accumulated inside the elastic body 12 ', the rear rear cover 1
There is a case where 1'cannot rotate upward integrally, and when it is an automatic rotary, the rotary tiller itself goes up and becomes shallow tiller, and when the soil puddle is removed, it falls again and the tilling depth is not constant. was there. In FIG. 5, 10 'is a front rear cover, 22' is a connecting link, and 26 'is a hanger rod.

[0004]

The present invention is configured as follows to solve the above problems. That is, in the configuration in which the rear cover of the rotary tiller is divided into a front rear cover and a rear rear cover into two, front and rear, and a flexible member is connected between the both rear covers, a connecting link is interposed between the front rear cover and the rear rear cover. The connecting portion of the connecting link and one of the front rear cover or the rear rear cover is connected at one pivot fulcrum, and the connecting portion of the other is connected at two pivot fulcrums, and one of the two pivot fulcrums At least one of the rear covers is provided with a flexible portion, and the rear rear cover is free to move downward with respect to the front rear cover, while the rear cover is regulated by the flexible member in the upward direction so that both rear covers rotate substantially integrally. Configured to work.

[0005]

Next, examples will be described. FIG. 1 is a side view of a rotary tiller equipped with a rear cover of the present invention, FIG. 2 is a partial plan view of the same, FIG. 3 is a side view showing a connecting structure of upper and lower rear covers, and FIG. It is a side view which shows the state which accumulated.

1 and 2, the rotary tiller R
Is a support 2 projecting forward from the gearbox 1, and a front end of the support 2 is connected to a rear part of the tractor so as to be able to move up and down.
An upper end of a lift link 3 pivotally connected to a midway portion of the support 2 is connected to a lift arm of the tractor so that the rotary tiller R can be moved up and down by rotating the lift arm. Beams 4 and 4 to the left and right from the gear box 1
And a chain case 5 and a side support are fixedly provided on the outside of the beams 4 and 4, and a plurality of plowing shafts are mounted on the plowing pawl shaft by horizontally extending a plowing pawl shaft under the chain case 5 and the side support. Claws 6 ... are planted.

An input shaft 7 is projected from the front surface of the gearbox 1 and is connected to a PTO shaft of a tractor through a universal joint 8 so that power can be transmitted. The bevel gear is used to drive the cultivating pawl shaft via the transmission shaft in the beam 4, the sprocket in the chain case 5, and the chain.

The upper part of the circumference of the rotary locus of the tilling claw 6 is covered with a tilling cover 9, and the rear cover A of the present invention is pivotally supported on the rear portion of the tilling cover 9 so as to be rotatable up and down. It covers the outer circumference. The rear cover A includes a front rear cover 10, a rear rear cover 11, and a flexible member 12 made of a flexible plate material such as rubber or resin.
The flexible member 12 includes a front rear cover 10 and a rear rear cover 1.
1, and a rake 13 is provided on the lower surface of the rear rear cover 11.

As shown in FIGS. 1 to 3, a pivot arm 14 is projectingly provided on the front rear cover 10, and a sensor rod 15 is inserted into the pivot arm 14. The front portion of the sensor rod 15 is , A rear end of a support arm 17 protruding rearward from the beam 4 is slidably inserted, a sensor wire 16 is connected to a front end of the sensor rod 15, and an outer side of the sensor wire 16 is connected to the support arm 17.
The other end of the sensor wire 16 is connected to a lifting control device of the tractor. Therefore, when the rear cover A rotates, the sensor rod 15 slides back and forth and is fed back to the lifting control device via the sensor wire 16 so that the working depth can be controlled to be constant.

A front support stay 20 is erected on the front rear cover 10 and a pivot shaft 23 is provided horizontally. On the other hand, a rear support stay 21 is erected on the rear rear cover 11 as well. 24 and 25 are vertically arranged side by side, and between the front support stay 20 and the rear support stay 21, one is pivotally supported by one pivot and the other is pivotally supported by two pivots. Thus, they are connected by the connecting link 22. In other words, the connecting link 22 is formed in a triangular shape, and the pivotal support holes 22a, 22b, 22c are opened at the tops thereof, and the pivotal support hole 22a of the first top is pivotally supported on the front support stay 20 by the pivot shaft 23. And the second top pivot hole 22
b is pivotally supported below the rear support stay 21 by a pivot shaft 24, and the pivot hole 22c at the third apex is a through hole, that is, an arc-shaped long hole centering on the pivot hole 22b or a large backlash. The support shaft 21 is formed above the rear support stay 21 and is formed into a hole or the like.
By being pivotally supported by 5, the pivot hole 22c and the pivot shaft 2
The rear rear cover 11 is rotatable about the pivot hole 22b within the range of the pivot hole 22c. In addition, in the present embodiment, the interchanged portion including the pivotal support hole 22c and the pivotal support shaft 25 is provided on the upper side, that is, the third top portion, but may be provided on the lower side, that is, the second top portion.

Further, a plurality of pivot holes 22d, 22d ... Are opened in the connecting link 22 so that the mounting position of the front rear cover 10 can be changed, and the earth mass can be adjusted according to the soil quality and the cultivating condition. It allows you to adjust the open space of. Further, in order to prevent the plowing claws from entering the turning locus due to the rear rear cover 11 being lowered too much, as shown in FIG. 4, the lower portion of the connecting link 22 should come into contact with the rear end of the front rear cover 10 when it is lowered to some extent. Also plays the role of a stopper.

The rear end of the hanger rod 26 is pivotally supported on the upper end of the rear support stay 21, and the middle portion of the hanger rod 26 is inserted into the support boss 27.
7 is pivotally supported on the upper end of the front support stay 20. And
The upper part of the hanger rod 26 is inserted into the support boss 28,
The support boss 28 is pivotally supported by the depth frame 29, and both sides of the support boss 28 are urged by springs 30 and 31 fitted onto the hanger rod 26. A reinforcing plate 32 is interposed between the rear support stay 21 and the rear end of the rear rear cover 11. The support stays 20 and 21 and the hanger rod 26 provided on the rear cover A are provided as a left and right pair.

In such a structure, when cultivating work is carried out by the rotary cultivator R, as shown in FIG.
Even if the lump of soil or the like concentrates on the inner portion of the flexible member 12 and the flexible member 12 bulges upward and rearward, the rear rear cover 11
Is supported at two points by the connecting link 22 and has only looseness corresponding to the interchange hole (the pivotal support hole 22c here), and
Since the flexible member 12 pulls when it is rotated upward by a certain amount or more, the front rear cover 10 and the rear rear cover 11 are pulled.
Can rotate almost integrally. That is, although the upward rotation of the rear rear cover 11 around the pivot shaft 23 is restricted by the rubber plate and the pivot hole 22c, the downward rotation is free, and thus the autorotary sensitivity is not deteriorated. It is composed.

[0014]

Since the present invention is constructed as described above, it has the following effects. That is, by connecting the front rear cover and the rear rear cover at at least three pivot points of the connecting link, the flexible member cannot be flexed more than necessary, and the clod is accumulated inside the flexible member portion. Disappears. In addition, the interchangeable portion provided on the connecting link allows the rear rear cover to move downward with respect to the front rear cover, while the rear cover is regulated by a flexible member in the upward direction so that both rear covers rotate substantially integrally. As a result, there is no decrease in the sensitivity of the sensor when controlling the working depth. Further, the connecting link itself that connects the front rear cover and the rear rear cover serves as a reinforcing member, so that the structure can be inexpensively configured without newly providing a member for reinforcing the rear cover.

[Brief description of drawings]

FIG. 1 is a side view of a rotary tiller equipped with a rear cover of the present invention.

FIG. 2 is a partial plan view of the same.

FIG. 3 is a side view showing a connection configuration of upper and lower rear covers.

FIG. 4 is a side view showing a state where soil is accumulated in a flexible member portion.

FIG. 5 is a side view showing a state where soil is accumulated in a flexible member portion of a conventional rear cover.

[Explanation of symbols]

 A rear cover 10 front rear cover 11 rear rear cover 12 flexible member 22 connecting link 22a, 22b, 22c pivot hole 23, 24, 25 pivot shaft

Claims (1)

[Claims] 1. A rear cover of a rotary cultivator is divided into a front rear cover and a rear rear cover into two parts, a front part and a rear part, and a flexible member connecting between the front cover and the rear cover. A link is interposed, and a connecting portion between the connecting link and either one of the front rear cover or the rear rear cover is connected at one pivot fulcrum, and a connecting portion with the other is connected at two pivot fulcrums. A flexible part is provided on at least one of the fulcrums, and the rear rear cover is free to move downward with respect to the front rear cover, while the rear cover is restricted in the upward direction so that both rear covers are substantially integrated. The rear cover of the rotary tiller, which is characterized by rotating as a whole.