JPH06153604A - Land-grading structure of tilling device - Google Patents

Abstract

PURPOSE:To provide the land-grading structure of the tiller capable of grading the tilling surface of a field in a good and simple structure even when the depth of plowing is deep. CONSTITUTION:A land-grading member 21 pressed so as to grade the surface of a tilled ground is vertically movably disposed on the main body of a tilling device 6 through a four-link mechanism 22 in a state forced to the lowering side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leveling structure for a tiller such as a rotary tiller mounted on an agricultural tractor.

[0002]

2. Description of the Related Art Conventionally, as a ground leveling structure for this type of tilling device, as disclosed in, for example, Japanese Patent Laid-Open No. 4-166002, a tilling device body is rearwardly rockable around a horizontal axis. It is well known that a ground plate is provided, and the ground surface of the cultivated ground surface is flatly ground by its own weight and downward biasing by a spring.

[0003]

However, in the above-mentioned conventional structure, when the plowing depth is deep, the sinking amount of the main body of the tilling device is large, so that the leveling plate becomes almost horizontal. The function of the ground leveling plate to push the soil forward is deteriorated, and in the case of leveling only by its own weight, the leveling plate is easily lifted and it is difficult to perform good leveling. Further, in the case where the spring is equipped with a spring so that a downward load is applied to the ground leveling portion of the ground leveling plate and the ground leveling function is enhanced, the structure in which the spring is installed is complicated and the number of parts is increased. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a leveling structure for a cultivating device that can satisfactorily level the surface of the cultivated land even if the cultivating depth is deep, and that has a simple structure.

[0004]

In order to achieve the above-mentioned object, the leveling structure for a tilling device according to the present invention is provided with a leveling body that presses down the leveled surface of a tilled land through a four-link mechanism. It is characterized in that it is provided on the main body of the tilling device so as to be vertically swingable and displaceable while being biased to the descending side. The operation and effect of this characteristic configuration are as follows.

[0005]

In other words, since the ground leveling body is provided so as to be vertically swingable and displaceable by the four-link mechanism, the plowing depth can be increased like the conventional one in which the ground leveling body is vertically swingable and displaceable around one horizontal axis. The posture of the ground leveling body does not change significantly due to
Stable exerting the function of pushing the soil forward regardless of the working depth.

[0006]

Therefore, regardless of the working depth, the soil leveling function by the ground leveling body to the front is stabilized. It is no longer necessary, and the desired function can be achieved while reducing the number of parts.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a walk-behind management machine provided with a leveling structure for a tilling device according to the present invention. This walking type management machine
One traveling wheel 1 is connected to and supported by a mission case 3 via a transmission case 2, and at the same time, the mission case 3
4, an engine 4 is disposed in front of the vehicle, and the engine 4 and the mission case 3 are interlockingly connected to each other via a belt transmission mechanism 5, and a rotary tiller as a main body of the tiller is provided at the rear of the mission case 3 via a hitch. 6 is mounted and a steering handle 7 is extended from the upper part of the mission case 3 toward the rear.

As shown in FIG. 3, the transmission case 2 has a traveling output shaft 3a of the transmission case 3 rotatably supported at an upper end portion thereof, and a side chain of the transmission case 2 has an auxiliary chain. The case 8 is detachably attached, and the traveling output shaft 3 is projected laterally outward from the transmission case 2.
The shaft end of a is spline-fitted to the drive sprocket 8a of the auxiliary chain case 8. The input shaft 2a, which is laterally outwardly projected from the transmission case 2, is spline-fitted to the driven sprocket 8a of the sub chain case 8 which is transmitted by the chain. In this state,
The sub chain case 8 is transmitted to the transmission case 2 by the bolt 9.
Fixed to the sprocket of the input shaft 2a and the axle 1a
The traveling wheel 1 is transmitted by the chain 10 stretched over the sprocket. Also, as shown in FIG. 3, the two sprockets 8a, 8a of the auxiliary chain case 8 are
One side of a has a small diameter and the other side has a large diameter, and the spline fitting structures of the two have the same shape. Therefore, with this configuration, the small diameter sprocket 8 is
When the sub-chain case 8 is connected to the transmission case 2 in a state in which the a and the traveling output shaft 3a are spline-fitted to each other, the traveling speed is low as in the case of working traveling, and the large diameter sprocket 8a and the traveling case are used. When the sub-chain case 8 is connected to the transmission case 2 in a state where the output shaft 3a is spline-fitted, the shift can be switched so as to be in a high-speed traveling state as when traveling on the road.

As shown in FIG. 4, the transmission from the engine 4 to the mission case 3 is performed by a high speed transmission belt 11 stretched over an output shaft 4a of the engine 4 and an input shaft 3b of the transmission case 3 and a low speed transmission. The belt 12 and the belt 12 are selectively switched. Further, the transmission to the rotary tiller 6 is performed by the work device drive output shaft 3c of the transmission case 3 and the input shaft 1 of the rotary transmission case 13.
Two transmission chains 14, 1 stretched over 3a
5 through. These two transmission chains 14,1
The input shaft 13a for tensioning 5 is provided with a meshing clutch 16 which can be interlockingly connected with the input shaft 13a with respect to the driven sprockets 14a and 15a arranged side by side in a loosely fitted state. The mesh clutch 16 is formed by spline-fitting a shift member 16a, which is slidable in the axial direction of the input shaft 13a, between the two driven sprockets 14a and 15a so that the shift member 16a and each driven sprocket 1 can be driven.
4a and 15a are configured so that they can be engaged at the sliding ends. The shift member 16a is linked to a speed change operation tension clutch mechanism for selecting the high speed transmission belt 11 and the low speed transmission belt 12 and switching the transmission mode so that transmission is possible. When the power is switched to be transmitted by the high speed transmission belt 11, the driven sprocket 15 for high speed transmission is driven.
The shift member 16a is interlocked and connected to a, while the tension clutch mechanism for gear shift operation is used for the low speed transmission belt 1
When the power is switched to be transmitted by the gear 2, the shift member 16a is attached to the driven sprocket 14a for low speed transmission.
The gear shift operation lever, the gear shift operation tension clutch mechanism, and the shift member 16 are mechanically linked to each other so as to be in an interlocking connected state. In the figure, 17 is a work device driving sub-chain case.

As shown in FIG. 1, a rotary tiller 6 is provided.
Is a cover having a semicircular shape in a side view with a rotary claw 19 protruding from a rotary shaft 18 connected to the output shaft of the rotary transmission case 13 and covering the rotary shaft 18 and the upper half of the rotary claw 19. A ground leveling cover 21 as a ground leveling body is mounted on the cover 20 via a four-link mechanism 22 so as to be vertically displaceable.
That is, the front end portions of the pair of upper and lower connecting arms 22a and 22b are pivotally attached to the left and right side walls 20A and 20B of the cover 20 so as to be swingable around the horizontal axis, and the rear end portions of the connecting arms 22a and 22b are also provided. Are pivotally attached to the left and right end portions of the ground leveling cover 21 so as to be swingable around the horizontal axis, thereby forming a four-link mechanism 22. And the leveling cover 2
As shown in FIG. 2, 1 is configured by bending a sheet metal along a semi-circular curved portion of the cover 20, and the quadruple link mechanism 22 has a side-view unequal square shape. Therefore, the leveling cover 21 is vertically displaced in a state in which the posture is substantially along the semicircular curved portion of the cover 20.

With the above structure, the leveling cover 21 is urged downward only by the weight of the leveling cover 21, and the lower end of the leveling cover 21 is pressed against the ground surface after plowing. Therefore, the ground surface after plowing is flattened by the lower end of the leveling cover 21. Also, with the 4-link mechanism 22,
Since the leveling posture of the leveling cover 21 is maintained at a substantially constant leveling posture even when the plowing depth is relatively deep or shallow, the leveling can be performed well even when the plowing depth in the rotary tiller 6 is deep.

In order to apply a downward biasing force to the ground leveling cover 21, a coil spring may be installed over the cover 20 and the leveling cover 21, or a coil spring may be installed over the cover 20 and the connecting arm.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view showing a walk-behind management machine.

FIG. 2 is a perspective view showing a ground leveling body.

FIG. 3 is a schematic diagram showing a transmission structure for traveling wheels.

FIG. 4 is a schematic diagram showing a power transmission structure to the tiller.

[Explanation of symbols]

 6 Tillage device main body 21 Leveling body 22 4 link mechanism

Claims (1)

[Claims] 1. A tilling device capable of vertically swinging displacement in a state in which a ground leveling body (21) that presses down a cultivated ground surface so as to level the ground is urged downward through a four-link mechanism (22). The leveling structure of the tiller provided in the main body (6).