JPS62190005A - Walking type plow - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a walk-behind tiller equipped with a rotary tiller capable of rolling freely.

[Conventional technology]

Conventionally, in such a walk-behind tiller, a ground implement for adjusting the plowing depth has been attached to a rotary tiller that is connected to the rotary tiller so that it can roll freely.

[Problem that the invention seeks to solve]

However, as mentioned above, when the grounding device is attached to the rotary tillage device, not only is the rolling load caused by the rolling of the rotary tillage device applied to the joint between the rotary tillage device and the machine body, but it also supports part of the weight of the machine. Since the ground reaction force from the ground contacting equipment is applied, the connecting portion must be made larger to increase the support strength at the connecting portion, which leads to an increase in the weight of the machine and increases costs.

An object of the present invention is to suppress the increase in size of the connecting portion by reducing the load applied to the connecting portion between the rotary tilling device and the machine body.

[Means for solving problems]

The characteristic configuration of the present invention is that the fixing member on the side of the machine supports a grounding tool for adjusting the plowing depth of the rotary tiller, and the rotary tiller is supported so as to be able to roll freely around the front and rear axis of the rotary tiller. The point is that

[For production]

That is, by supporting the load due to the weight of the machine by the wheels and the grounding tool attached to the fixing member on the machine body side, it is possible to avoid applying ground reaction force from the grounding tool to the connection part between the rotary tiller and the machine body.

〔Effect of the invention〕

Therefore, by reducing the load applied to the connection between the rotary tiller and the machine body, there is no need to increase the support strength at the connection compared to the case where the ground reaction force from the ground contact tool is also supported. It was possible to suppress the increase in size of the parts, which was advantageous in terms of weight reduction and cost.

〔Example〕

FIG. 3 shows a walk-behind cultivator according to the present invention, which includes an engine (E) mounted on a body frame (1),
A vertically elongated transmission case (?l) is provided at the rear lower part of this engine (E), and a pair of left and right running wheels (2), (2) are supported and provided at the lower part of this mission case (M). A rotary tiller (3), a control handle (4), and a tail wheel (5) as a grounding tool for adjusting the plowing depth of the rotary tiller (3) are provided at the rear of the mission case (M). It is something that

To explain in detail the mounting structure of the rotary tillage bag W (3) on the machine side, as shown in Figs. 1 and 2, there is a U-shaped cross section at the rear of the mission case (M). Fix the hitch mounting frame (6) with bolts, and then
) is attached to the rear boss part (6A) of the hitch (7) for connecting the work equipment.
) is rotatably fitted inside and supports the cylindrical body (8) to which the bolts are fixed by bolts, and the connecting member is connected to the hitch (7) by a pair of left and right pins (9), (9) in a fitted state. (10) is the rotary case (
3A) is fixed with bolts. Then, the cylindrical body (8
) An operating lever (13) integrally formed with a worm (12) that engages with a worm wheel (11) formed on a part of the outer circumferential surface of the flange portion (8A) of the pitch mounting frame (6) is fixed to the pitch mounting frame (6). Braken) (14), and by rotating the operating lever (13), the cylindrical body (8) is rotated within a certain angle range, and the rotary tiller (3) is aligned with the front and back axis relative to the machine. It is configured to be able to roll freely around the core (X).

To explain the drive structure of the rotary tiller (3), it includes a power take-off shaft (15) projecting from the top of the mission case (M) and an input shaft (16) projecting from the hitch mounting frame (6). A power transmission shaft (20) and a rotary tiller (3) drive which are interlockingly connected via a sub chain case (17) and interlockingly connected to the input shaft (16) via bevel gears (18) and (19). Output shaft (2
1) to transmit power from the mission case (M) to the rotary tiller (3).

To explain the mounting structure of the tail wheel (5), the tail wheel (5) is attached to a support arm (22) fixed to the handle mounting frame (4A) of the control handle (4) as a fixed member on the side of the machine.
) is installed by supporting the support tube (24) into which the spindle (23) of It is. Further, a manual operation handle (25) is attached to the upper part of the support tube (24) of the tail wheel (3).
), the tail wheel (5) can be raised and lowered, thereby making it possible to adjust the plowing depth of the rotary tiller (3).

To be more specific about the rotary case (3A), a lower case (3b) provided with a claw shaft (26) at the lower part is fitted onto the upper case (3a) attached to the hitch side so as to be relatively rotatable; A bracket (27) fixed to the upper part of the lower case (3b) and a bracket (30) fixed to the upper part of the hitch (7) are connected to the hydraulic cylinder (2).
8), and when the aircraft changes direction at the edge of a ridge, by operating the operating lever (30) provided on the control handle (4) side, the hydraulic cylinder (28) is shortened and the lower case (3b) is connected. ) around the horizontal axis (Y) to raise the rotary tiller (3).

Note that FIG. 1 (31) is an auxiliary plate for increasing the connection strength between the upper case (3a) and the lower case (3b).

[Different real layer side]

In the embodiment described above, the rotary tiller (3) was manually operated by turning the rotary tiller (3) using the control lever (operation 3). The motor may be operated to automatically rotate the rotary tiller (3) by the angle of inclination, or the inclination sensor may be omitted and the electric motor may be operated by an artificially set angle. The rotary tiller (3) may be rotated using the rotary tiller.

Further, in the above embodiment, the tail wheel (5) is operated by a manual operation handle (
25), but it may be raised and lowered automatically using an electric motor or the like.

In this case, regardless of the unevenness of the tiller, the rotary tiller (3
) It is even better if the elevation control is performed so as to maintain the plowing depth at a set plowing depth. Note that a grounding rod may be used in place of the tail wheel (5), and various types of grounding tools may be used.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind cultivator according to the present invention, and FIG. 1 is a cross-sectional view showing the rolling structure of the rotary tiller, and FIG. 2 is a rear view of the operating lever for rolling the rotary tiller. , FIG. 3 is an overall side view of the walk-behind cultivator. (3)...Rotary tillage device, (4A)...
...Fixing member, (5) ...Grounding tool, (X)
・・・・・・Anteroposterior axis center.

Claims (1)

[Claims] The fixing member (4A) on the machine side supports the grounding tool (5) for adjusting the plowing depth of the rotary tillage device (3), and the rotary tillage device (3) is aligned with the front and back axis (X) with respect to the machine. ) A walk-behind tiller that is supported so that it can roll freely around it.