JP6731780B2 - Walk-behind work machine - Google Patents

Walk-behind work machine Download PDF

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JP6731780B2
JP6731780B2 JP2016095424A JP2016095424A JP6731780B2 JP 6731780 B2 JP6731780 B2 JP 6731780B2 JP 2016095424 A JP2016095424 A JP 2016095424A JP 2016095424 A JP2016095424 A JP 2016095424A JP 6731780 B2 JP6731780 B2 JP 6731780B2
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grounding
traveling
machine body
ground
grounding body
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JP2017201934A (en
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稔仁 森脇
稔仁 森脇
賢 打谷
賢 打谷
恵一 瀬崎
恵一 瀬崎
貞雄 山中
貞雄 山中
繁 増田
繁 増田
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Kubota Corp
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Kubota Corp
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Description

本発明は、走行車輪を備えた走行機体の後部にロータリ耕耘装置を備えた歩行型作業機に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walk-behind work machine provided with a rotary tiller at a rear portion of a traveling machine body having traveling wheels.

従来では、細長い棒状の接地体が、上下方向に延びる状態で、且つ、ロータリ耕耘装置の後部側に位置する状態で備えられていた（例えば、特許文献１参照）。接地体は、ロータリ耕耘装置に対する相対高さを変更してロータリ耕耘装置による耕耘深さを調整したり、地面に接当して移動走行に抵抗を与える機能を備えている。説明を加えると、耕耘作業時において、ロータリ耕耘装置の回転駆動に伴って前方側に向かうように駆動反力が作用する。その結果、走行車輪による駆動力に対して、ロータリ耕耘装置による駆動反力が加わり、走行機体が走行車輪の駆動速度よりも増速され、操縦操作が行い難くなることがある。そこで、接地体が地面に接当することにより、移動走行に抵抗を与えて前進移動速度を抑制することができる。 Conventionally, a long and slender rod-shaped grounding body has been provided in a state of extending in the vertical direction and in a state of being located on the rear side of a rotary tiller (see, for example, Patent Document 1). The grounding body has a function of changing the relative height with respect to the rotary tiller to adjust the tilling depth by the rotary tiller, and having a function of contacting the ground and giving a resistance to traveling traveling. In addition, during the tilling work, the driving reaction force acts toward the front side as the rotary tiller rotates. As a result, the driving reaction force of the rotary tiller is added to the driving force of the traveling wheels, the traveling vehicle body is accelerated more than the driving speed of the traveling wheels, and it may be difficult to perform the steering operation. Therefore, by contacting the ground with the ground, it is possible to give resistance to the traveling traveling and suppress the forward traveling speed.

特開２０１２−１５号公報JP2012-15A

ロータリ耕耘装置は、走行車輪の回転方向と同じ方向に回転駆動する正転状態だけではなく、それとは反対方向に回転駆動する逆転状態に切り換え可能に構成されているものがある。ロータリ耕耘装置が正転状態で駆動されるときは、適度に接地体が移動走行に抵抗を与えて移動速度を抑制することができる。しかし、ロータリ耕耘装置が逆転状態で駆動されると、耕耘作業時のロータリ耕耘装置の回転駆動に伴う駆動反力は機体移動方向とは逆方向になる。このように駆動反力が機体移動方向と逆方向に作用すると、走行機体の前進走行を妨げる状態となり、ロータリ耕耘装置が下方に沈み込む状態になりやすい。 Some rotary tillers are configured so that they can be switched not only in a normal rotation state in which they are rotationally driven in the same direction as the traveling direction of the traveling wheels, but also in a reverse rotation state in which they are rotationally driven in the opposite direction. When the rotary cultivator is driven in the normal rotation state, the grounding body can appropriately resist the traveling traveling to suppress the traveling speed. However, when the rotary tiller is driven in the reverse rotation state, the driving reaction force associated with the rotational drive of the rotary tiller during the tilling operation is opposite to the machine body moving direction. When the driving reaction force acts in the direction opposite to the moving direction of the machine body in this manner, the traveling machine body is prevented from traveling forward, and the rotary tiller is likely to sink downward.

上記従来構成では、接地体はロータリ耕耘装置により耕された後の軟かい地面に作用するものであるから、ロータリ耕耘装置が沈み込むと、その耕された後の地面に接地体が作用することになり、耕深が深めになって接地体が地面に食い込み、移動走行に対する抵抗が大きくなり、機体が円滑に移動走行できないおそれがあった。 In the above conventional configuration, the grounding body acts on the soft ground after being cultivated by the rotary cultivating device, so when the rotary cultivating device sinks, the grounding body acts on the cultivated ground. As a result, the depth of plowing became deeper and the ground contact body digs into the ground, increasing the resistance to traveling and traveling, and the aircraft may not be capable of traveling and traveling smoothly.

そこで、耕耘深さの調整やロータリ耕耘装置が正転状態で駆動されるときに移動走行に抵抗を与えることを良好に行えるようにしながら、ロータリ耕耘装置が逆転状態で駆動されるときに移動走行が抑制されるおそれを少なくすることが望まれていた。 Therefore, while making it possible to favorably adjust the tilling depth and give resistance to the traveling traveling when the rotary tiller is driven in the forward rotation state, the traveling traveling is performed when the rotary tiller is driven in the reverse rotation state. It has been desired to reduce the risk of being suppressed.

本発明に係る歩行型作業機の特徴構成は、走行車輪を備えた走行機体と、前記走行機体の後部に位置し、前記走行車輪の回転方向と同じ方向に回転駆動する正転状態と前記回転方向と反対方向に回転駆動する逆転状態とに切り換え可能なロータリ耕耘装置と、地面に接地する棒状部材によって構成され、前記ロータリ耕耘装置が前記逆転状態のときに前記ロータリ耕耘装置の地面への沈み込みを抑制する接地体と、前記走行機体から後上方に向けて延出された操縦ハンドルと、が備えられ、前記接地体は、機体側面視で後ろ上がりに傾斜する状態で前記走行車輪と前記ロータリ耕耘装置との間に位置して、前記ロータリ耕耘装置にて耕される前の地面に接地し、前記接地体は、前記接地体のうちの地面に接する接地作用部の地面に対する相対高さが変更されるように、前記接地体の延び方向に沿って位置変更可能に支持され、前記接地作用部の底部に、前記接地体よりも幅広の平板状の接地部材が、機体前部側ほど上側に位置する傾斜姿勢で設けられている点にある。 A characteristic configuration of a walk-behind work machine according to the present invention includes a traveling machine body provided with traveling wheels, a forward rotation state in which the traveling machine body is located at a rear portion of the traveling machine body, and is rotationally driven in the same direction as the traveling wheel. Direction and a rotary cultivator that can be switched to a reverse direction in which it is driven to rotate in the opposite direction, and a rod-shaped member that is grounded to the ground. A grounding body that suppresses jamming and a steering handle that extends rearward and upward from the traveling machine body are provided, and the grounding body and the traveling wheel and the traveling wheel in a state where the grounding body inclines backward and upward in a side view of the machine body. Positioned between the rotary cultivator and grounded to the ground before being cultivated by the rotary cultivator, the grounding body is a relative height to the ground of the grounding action portion in contact with the ground of the grounded body. Is supported so that the position can be changed along the extension direction of the grounding body, and a flat plate-shaped grounding member that is wider than the grounding body is provided at the bottom of the grounding action portion toward the front side of the machine body. The point is that it is provided in a tilted position located on the upper side .

本発明によれば、接地体は、ロータリ耕耘装置にて耕される前の地面、すなわち未耕地に接地するので、この接地体のロータリ耕耘装置に対する相対高さを変更することにより、ロータリ耕耘装置が正転状態及び逆転状態のいずれの状態で作業する場合であっても、耕耘作業時におけるロータリ耕耘装置による耕耘深さを適正に調整することができる。 According to the present invention, the grounding body is grounded to the ground before being cultivated by the rotary cultivating device, that is, to the uncultivated land. Therefore, by changing the relative height of the grounding body to the rotary cultivating device, the rotary cultivating device is changed. Regardless of whether the work is performed in the normal rotation state or the reverse rotation state, it is possible to properly adjust the tilling depth by the rotary tiller during the tilling work.

ロータリ耕耘装置が正転状態で作業する場合には、接地体が未耕地に接地するときに、操縦者が接地体を少し下方に下げながら作業することで、移動走行に抵抗を付与することができる。又、ロータリ耕耘装置が逆転状態で作業する場合には、駆動反力が機体移動方向と逆方向に作用してロータリ耕耘装置が深く沈み込もうとしても、接地体が未耕地に接地することにより、それ以上の沈み込みを抑制して、移動走行に対して抵抗になることを回避することができる。 When the rotary tiller is working in the normal rotation state, when the ground contacting body touches the uncultivated land, the operator can work while lowering the ground contacting body slightly downward to give resistance to traveling traveling. it can. In addition, when the rotary tiller operates in the reverse direction, even if the drive reaction force acts in the direction opposite to the movement direction of the machine and the rotary tiller tries to sink deeply, the grounding body touches the uncultivated land. Further, it is possible to suppress the further sinking and to avoid the resistance to the traveling traveling.

従って、耕耘深さの調整やロータリ耕耘装置が正転状態で駆動されるときに移動走行に抵抗を与えることを良好に行えるようにしながら、ロータリ耕耘装置が逆転状態で駆動されるときに移動走行が抑制されるおそれを少なくすることが可能となった。 Therefore, while making it possible to favorably adjust the tilling depth and give resistance to the traveling traveling when the rotary tiller is driven in the forward rotation state, the traveling traveling is performed when the rotary tiller is driven in the reverse rotation state. It has become possible to reduce the risk of being suppressed.

本発明においては、前記接地作用部が、機体前部側ほど上側に位置する傾斜姿勢に設けられていると好適である。 In the present invention, it is preferable that the grounding action portion is provided in an inclined posture that is positioned higher toward the front side of the machine body.

本構成によれば、接地作用部が地面に接地した状態で走行機体が前進走行すると、傾斜姿勢の搬送面により摺接案内される。接地作用部が、機体前部側ほど上側に位置する傾斜姿勢に設けられるから、例えば、地面上に凸部があっても、接地作用部は、凸部に乗り上げて円滑に通過することができ、凸部に引っ掛かって走行の妨げになるおそれが少ない。 According to this configuration, when the traveling machine body travels forward while the grounding action unit is in contact with the ground, the traveling surface is slidably guided by the inclined transport surface. Since the grounding action part is provided in an inclined posture that is positioned higher toward the front side of the aircraft, for example, even if there is a convex part on the ground, the grounding action part can ride on the convex part and pass smoothly. , It is less likely to get caught in the convex portion and hinder traveling.

本発明においては、前記走行機体に、前記ロータリ耕耘装置に駆動力を伝達する伝動ケースが備えられ、前記接地体は、前記伝動ケースの横側部に支持されていると好適である。 In the present invention, it is preferable that the traveling machine body is provided with a transmission case for transmitting a driving force to the rotary tiller, and the grounding body is supported on a lateral side portion of the transmission case.

本発明においては、前記走行機体に、前記ロータリ耕耘装置に駆動力を伝達する伝動ケースが備えられ、前記接地体に、前記延び方向に沿って間隔をあけて形成された複数の調整用孔が備えられ、前記伝動ケースに支持された筒状支持部材が備えられ、前記筒状支持部材に前記接地体がスライド可能に挿入され、前記筒状支持部材の外周側から連結部材を差し込んで前記複数の調整用孔のいずれかに係合させることで、前記接地体の前記筒状支持部材に対する位置が固定されると好適である。 In the present invention, the traveling machine body is provided with a transmission case that transmits a driving force to the rotary tiller, and the grounding body has a plurality of adjustment holes formed at intervals along the extending direction. A cylindrical support member supported by the transmission case is provided, the grounding body is slidably inserted into the cylindrical support member, and a connecting member is inserted from the outer peripheral side of the cylindrical support member to insert the plurality of members. It is preferable that the position of the grounding body with respect to the cylindrical support member is fixed by engaging with any of the adjusting holes.

歩行型作業機の全体側面図である。It is a whole side view of a walk-behind work machine. 歩行型作業機の全体平面図である。It is a whole plan view of a walk-behind work machine. 接地体配設部の側面図である。It is a side view of a grounding body arrangement part.

以下、本発明に係る歩行型作業機の実施形態を図面に基づいて説明する。 Hereinafter, an embodiment of a walk-behind work machine according to the present invention will be described with reference to the drawings.

〔全体構成〕
図１及び図２に示すように、走行機体１の後部にロータリ耕耘装置２を備えて歩行型作業機が構成されている。走行機体１は、機体フレームを兼用する伝動ケース３と、その伝動ケース３の下部に備えられた左右の車軸４に連結された左右一対の走行車輪５、伝動ケース３の前部に連結された支持フレーム６と、支持フレーム６に支持されたエンジン７とを備えている。伝動ケース３は、走行用伝動部３Ａと、その走行用伝動部３Ａの上部から斜め後方下方に延出された作業用伝動部３Ｂとを備えている。エンジン７の出力軸８からベルト伝動機構９を介して走行用伝動部３Ａの入力軸１０にエンジン７の動力が伝達される。 〔overall structure〕
As shown in FIGS. 1 and 2, a walk-behind work machine is configured by providing a rotary tiller 2 at the rear of the traveling machine body 1. The traveling machine body 1 is connected to a transmission case 3 that also serves as a machine body frame, a pair of left and right traveling wheels 5 that are connected to left and right axles 4 provided at a lower portion of the transmission case 3, and a front portion of the transmission case 3. The support frame 6 and the engine 7 supported by the support frame 6 are provided. The transmission case 3 includes a traveling transmission portion 3A and a work transmission portion 3B extending obliquely rearward and downward from an upper portion of the traveling transmission portion 3A. The power of the engine 7 is transmitted from the output shaft 8 of the engine 7 to the input shaft 10 of the traveling transmission unit 3A via the belt transmission mechanism 9.

伝動ケース３の途中部から斜め後方上方に操縦ハンドル１１が延出されている。伝動ケース３の作業用伝動部３Ｂにロータリ耕耘装置２が備えられている。図１及び図２に示すように、ロータリ耕耘装置２は、伝動ケース３の下部から右及び左側に延出された駆動軸１２、右及び左の駆動軸１２に固定された複数の耕耘爪１３、耕耘爪１３の上方を覆うロータリカバー１４、ロータリカバー１４の後端部に連なる受止め板１５及び整地板１６等を備えている。右及び左の駆動軸１２及び耕耘爪１３は、通常は正転方向（図１の矢印Ａ１の方向）に回転駆動される。又、駆動軸１２及び耕耘爪１３は、逆転方向（図１の矢印Ａ２の方向）に回転駆動することも可能である。 A steering handle 11 extends obliquely rearward and upward from the middle of the transmission case 3. The rotary power tiller 2 is provided in the work power transmission portion 3B of the power transmission case 3. As shown in FIGS. 1 and 2, the rotary tiller 2 includes a drive shaft 12 extending rightward and leftward from a lower portion of the transmission case 3, and a plurality of tiller claws 13 fixed to the right and left drive shafts 12. The rotary cover 14 covers the upper part of the tillage claw 13, the receiving plate 15 and the leveling plate 16 connected to the rear end of the rotary cover 14, and the like. The right and left drive shafts 12 and the plowing claws 13 are normally driven to rotate in the forward rotation direction (direction of arrow A1 in FIG. 1). Further, the drive shaft 12 and the tilling claw 13 can be rotationally driven in the reverse direction (direction of arrow A2 in FIG. 1).

図２に示すように、ロータリカバー１４は、半円筒状の天井部１４ａの右及び左側部に、扇形状の横壁部１４ｂが連結されて構成され、伝動ケース３の上方、右及び左の駆動軸１２及び耕耘爪１３の上方を覆っており、伝動ケース３にロータリカバー１４（天井部１４ａ）が連結されている。 As shown in FIG. 2, the rotary cover 14 is configured by connecting a fan-shaped lateral wall portion 14b to the right and left portions of a semi-cylindrical ceiling portion 14a, and driving the transmission case 3 above, right, and left. A rotary cover 14 (ceiling part 14a) is connected to the transmission case 3 so as to cover the shaft 12 and the tiller 13 from above.

受止め板１５は、長方形状に形成され、可撓性を有するゴム板等により構成されている。受止め板１５は、横幅がロータリカバー１４の横幅と略同じ大きさに設定されている。
整地板１６は、受止め板１５の後方に重なる状態で配置されている。整地板１６は、長方形状に形成され、金属材により構成されている。 The receiving plate 15 is formed in a rectangular shape and is made of a flexible rubber plate or the like. The lateral width of the receiving plate 15 is set to be substantially the same as the lateral width of the rotary cover 14.
The ground leveling plate 16 is arranged behind the receiving plate 15 so as to overlap therewith. The leveling plate 16 is formed in a rectangular shape and is made of a metal material.

整地板１６の下端部分が前方に折れ曲がっており、整地板１６の下端部分には、鋸歯状の整地部１７が形成されている。図１に示す状態では、整地部１７が受止め板１５の下端よりも下側に位置する状態になる。 A lower end portion of the leveling plate 16 is bent forward, and a saw tooth-shaped leveling portion 17 is formed at the lower end portion of the leveling plate 16. In the state shown in FIG. 1, the ground leveling portion 17 is positioned below the lower end of the receiving plate 15.

〔接地体〕
図１，２，３に示すように、棒状部材にて構成されるとともに、地面に対する相対高さが変更する方向に沿って位置変更可能に支持される接地体１８が備えられている。接地体１８は、機体側面視で走行車輪５とロータリ耕耘装置２との間に位置して、ロータリ耕耘装置２にて耕される前の地面（未耕地）に接地する状態で設けられている。図２に示すように、接地体１８は、ロータリ耕耘装置２による耕耘幅内で且つロータリ耕耘装置２の前方側に備えられている。 [Grounding body]
As shown in FIGS. 1, 2, and 3, a grounding member 18 is provided that is configured by a rod-shaped member and is supported so that its position can be changed along the direction in which the relative height with respect to the ground changes. The grounding body 18 is located between the traveling wheels 5 and the rotary cultivating device 2 in a side view of the machine body, and is provided in a state of contacting the ground (uncultivated land) before being cultivated by the rotary cultivating device 2. .. As shown in FIG. 2, the grounding body 18 is provided within the tilling width of the rotary tiller 2 and on the front side of the rotary tiller 2.

接地体１８は、断面が細長い矩形状の角棒状部材にて構成されており、その下部に地面に接する接地作用部１８ａが備えられている。すなわち、図３に示すように、接地体１８は、上部側ほど機体後部側に位置する傾斜姿勢で設けられ、接地体１８の下端部が側面視で略Ｌ字形になるように屈曲した状態で後方側に延出されて接地作用部１８ａが形成されている。接地作用部１８ａには、断面略Ｌ字形で接地体１８よりも幅広の平板状の接地部材１９が固定状態で設けられている。接地作用部１８ａは、機体前部側ほど上側に位置する傾斜姿勢に設けられている。 The grounding body 18 is configured by a rectangular rod-shaped member having an elongated rectangular cross section, and a grounding action portion 18a that is in contact with the ground is provided at a lower portion thereof. That is, as shown in FIG. 3, the grounding body 18 is provided in an inclined posture in which the upper side is located closer to the rear side of the machine body, and the lower end of the grounding body 18 is bent in a substantially L shape in a side view. A grounding action portion 18a is formed extending to the rear side. A flat plate-shaped grounding member 19 having a substantially L-shaped cross section and wider than the grounding body 18 is provided in the grounding action portion 18a in a fixed state. The ground contacting portion 18a is provided in an inclined posture that is positioned higher toward the front side of the machine body.

次に、接地体１８の支持構造について説明する。
機体側面視で走行車輪５とロータリ耕耘装置２との間に位置する箇所において、伝動ケース３の左側にブラケット２０が固定されている。前後方向に幅広で左右方向に幅狭の角筒状の筒状支持部材２１がブラケット２０に固定されている。筒状支持部材２１は、走行車輪５の上方を覆う車輪カバー２２の開口部を通して上下方向に挿通する状態で設けられ、車輪カバー２２よりも上方に突出する状態で設けられている。筒状支持部材２１の左側面には、接地体１８を筒状支持部材２１に固定するための操作レバー付きのロックボルト２３（本発明の「連結部材」に相当する）が設けられている。 Next, the support structure of the grounding body 18 will be described.
A bracket 20 is fixed to the left side of the transmission case 3 at a position located between the traveling wheel 5 and the rotary tiller 2 in a side view of the machine body. A rectangular tubular support member 21 that is wide in the front-rear direction and narrow in the left-right direction is fixed to the bracket 20. The cylindrical support member 21 is provided in a state of being vertically inserted through an opening of a wheel cover 22 that covers the traveling wheels 5, and is provided in a state of protruding above the wheel cover 22. On the left side surface of the tubular support member 21, a lock bolt 23 (corresponding to the “connecting member” of the present invention) with an operating lever for fixing the grounding body 18 to the tubular support member 21 is provided.

接地体１８は、接地作用部１８ａの地面に対する相対高さが変更する方向に沿って走行機体１に位置変更可能に支持される位置調整部１８ｂを備えている。すなわち、図３に示すように、接地体１８における上下方向に沿って直線状に延びる上部側箇所が位置調整部１８ｂとして構成され、この位置調整部１８ｂには、上下方向に間隔をあけて横方向に挿通する状態で複数の調整用孔２４が形成されている。 The grounding body 18 includes a position adjusting section 18b that is supported by the traveling machine body 1 so as to be positionally changeable along a direction in which the relative height of the grounding action section 18a with respect to the ground changes. That is, as shown in FIG. 3, an upper portion of the grounding body 18 that extends linearly in the vertical direction is configured as a position adjusting portion 18b. A plurality of adjustment holes 24 are formed so as to be inserted in the direction.

接地体１８の接地作用部１８ａが圃場（未耕地）に接地することにより、圃場に対するロータリ耕耘装置２の高さ、すなわち耕耘深さが決められる。説明を加えると、接地体１８の位置調整部１８ｂを筒状支持部材２１に対して下方側から差し込み挿入して、ロックボルト２３を複数の調整用孔２４のうちのいずれかにネジ込み装着して接地体１８を固定する。そして、例えば、ロータリ耕耘装置２の耕耘深さを深めに設定するときは、ロックボルト２３を回して取り外した後、接地体１８を上方に移動させ、ロックボルト２３を、接地体１８の下部に位置する調整用孔２４に装着する。これにより、ロータリ耕耘装置２に対する接地体１８（接地作用部１８ａ）の高さが高い位置に変更されるため、ロータリ耕耘装置２の耕耘深さが深めに設定される。一方、ロータリ耕耘装置２の耕耘深さを浅くするときは、ロックボルト２３を取り外した後、接地体１８を下方に移動させ、ロックボルト２３を、接地体１８の上部に位置する調整用孔２４に装着して接地体１８を固定する。 The height of the rotary cultivator 2 with respect to the field, that is, the cultivating depth is determined by the grounding action portion 18a of the grounding body 18 grounding on the field (uncultivated land). To explain further, the position adjusting portion 18b of the grounding body 18 is inserted into the cylindrical support member 21 from the lower side, and the lock bolt 23 is screwed into any one of the plurality of adjusting holes 24. To fix the grounding body 18. Then, for example, when the tilling depth of the rotary tiller 2 is set to be deeper, the lock bolt 23 is rotated and removed, and then the grounding body 18 is moved upward to move the lock bolt 23 to a lower portion of the grounding body 18. It is mounted in the adjusting hole 24 located. As a result, the height of the grounding body 18 (grounding action portion 18a) with respect to the rotary cultivating device 2 is changed to a high position, so that the tilling depth of the rotary cultivating device 2 is set to be deep. On the other hand, when making the plowing depth of the rotary tiller 2 shallow, after removing the lock bolt 23, the grounding body 18 is moved downward, and the lock bolt 23 is moved to the adjustment hole 24 located above the grounding body 18. And grounding body 18 is fixed.

右及び左の駆動軸１２及び耕耘爪１３を正転方向（図１の矢印Ａ１の方向）に回転駆動しながら前進することにより、正転状態による耕耘作業が行われる。機体の前進に伴い、ロータリ耕耘装置２において、右及び左の駆動軸１２及び耕耘爪１３を正転方向（図１の矢印Ａ１の方向）に回転駆動することにより、耕起された土が２つの受止め板１５により受け止められ、整地板１６の下端部分の整地部１７によって地面が均平化される。 The right and left drive shafts 12 and the tilling claws 13 are forwardly rotated while being rotationally driven in the forward rotation direction (the direction of arrow A1 in FIG. 1), whereby the tilling work is performed in the forward rotation state. With the forward movement of the machine body, in the rotary tiller 2, the right and left drive shafts 12 and the tillage claws 13 are rotationally driven in the forward rotation direction (the direction of arrow A1 in FIG. 1) to cultivate the soil 2. It is received by one receiving plate 15, and the ground leveling part 17 at the lower end portion of the leveling plate 16 levels the ground.

接地体１８の接地作用部１８ａが未耕地に接地すると、それ以上、ロータリ耕耘装置２が下がることはできないので、そのときの作業深さが耕耘深さとして設定される。また、正転状態で作業するときには、操縦ハンドル１１を少し下方に押し下げるようにすることで、接地体１８が圃場面に接地することにより、移動走行に対する抵抗を付与することができる。 When the grounding action portion 18a of the grounding body 18 is grounded on the uncultivated land, the rotary tilling device 2 cannot be further lowered, so that the working depth at that time is set as the tilling depth. Further, when working in the normal rotation state, by pushing down the steering handle 11 a little, the grounding body 18 comes into contact with the field scene, thereby providing resistance to traveling traveling.

右及び左の駆動軸１２及び耕耘爪１３を逆転方向（図１の矢印Ａ２の方向）に回転駆動しながら前進することにより、逆転状態による耕耘作業を行うこともできる。逆転状態で作業するときには、ロータリ耕耘装置２が、走行車輪５の回転方向とは反対方向に逆転することによって、地面に沈み込もうとする力が働くが、接地体１８が未耕地に接当することにより、それ以上の沈み込みを抑制することができる。 By driving the right and left drive shafts 12 and the plowing claws 13 while rotating them in the reverse rotation direction (the direction of arrow A2 in FIG. 1), the plowing work in the reverse rotation state can be performed. When working in the reverse rotation state, the rotary tiller 2 reverses in the direction opposite to the direction of rotation of the traveling wheels 5 to exert a force to sink into the ground, but the grounding body 18 contacts the uncultivated land. By doing so, further sinking can be suppressed.

〔別実施形態〕
（１）上記実施形態では、接地体１８が、上部側ほど機体後部側に位置する傾斜姿勢で設けられる構成としたが、この構成に代えて、接地体１８が鉛直方向に沿って上下に延びる直立姿勢で設けられる構成としてもよい。 [Another embodiment]
(1) In the above-described embodiment, the grounding body 18 is provided in an inclined posture in which the upper side is located closer to the rear side of the machine body. However, instead of this configuration, the grounding body 18 extends vertically along the vertical direction. It may be configured to be provided in an upright posture.

（２）上記実施形態では、接地体１８が、ロータリ耕耘装置２による耕耘幅内に位置する状態で備えられる構成としたが、この構成に代えて、接地体１８がロータリ耕耘装置２による耕耘幅に対して横方向に外れた位置に備えられる構成としてもよい。 (2) In the above-described embodiment, the grounding body 18 is provided in a state of being located within the tilling width of the rotary tilling device 2, but instead of this configuration, the grounding body 18 is the tilling width of the rotary tilling device 2. It may be configured to be provided at a position laterally deviated from.

（３）上記実施形態では、接地体１８における地面に接する接地作用部１８ａが、機体前部側ほど上側に位置する傾斜姿勢に設けられる構成としたが、この構成に代えて、接地作用部が水平姿勢に設けられる構成としたり、接触面が球面状に設けられる構成等、種々の形態で実施することができる。 (3) In the above-described embodiment, the grounding action portion 18a in contact with the ground of the grounding body 18 is provided in an inclined posture that is positioned higher toward the front side of the machine body. However, instead of this configuration, the grounding action portion is not provided. It can be implemented in various forms such as a configuration in which it is provided in a horizontal posture or a configuration in which the contact surface is spherical.

（４）上記実施形態では、接地体１８が位置調整部１８ｂを備える構成としたが、この構成に代えて、接地体１８の位置を変更するための専用の位置調整機構を接地体１８とは別体の部材にて構成するものでもよい。 (4) In the above embodiment, the grounding body 18 is configured to include the position adjusting portion 18b. However, instead of this structure, a dedicated position adjusting mechanism for changing the position of the grounding body 18 is not referred to as the grounding body 18. It may be configured by a separate member.

（５）上記実施形態では、接地体１８が角棒状部材にて構成されたものを示したが、角筒状部材、丸棒部材、丸筒状部材、断面が三角形の部材等、種々の形態の棒状部材を用いることができる。 (5) In the above embodiment, the grounding body 18 is composed of the square rod-shaped member, but various forms such as a square tubular member, a round rod member, a round tubular member, and a member having a triangular cross section are used. The rod-shaped member can be used.

本発明は、走行機体の後部にロータリ耕耘装置を備えた歩行型作業機に適用できる。 INDUSTRIAL APPLICABILITY The present invention can be applied to a walk-behind work machine provided with a rotary tiller at the rear of a traveling machine body.

１ 走行機体
２ ロータリ耕耘装置
３ 伝動ケース
５ 走行車輪
１１ 操縦ハンドル
１８ 接地体
１８ａ 接地作用部
１８ｂ 位置調整部
１９ 接地部材
２１ 筒状支持部材
２３ ロックボルト（連結部材）
２４ 調整用孔 DESCRIPTION OF SYMBOLS 1 Traveling machine 2 Rotary tiller 3 Transmission case 5 Traveling wheel 11 Steering handle 18 Grounding body 18a Grounding action part 18b Position adjustment part
19 Grounding member 21 Cylindrical support member 23 Lock bolt (connecting member)
24 Adjustment hole

Claims (4)

走行車輪を備えた走行機体と、前記走行機体の後部に位置し、前記走行車輪の回転方向と同じ方向に回転駆動する正転状態と前記回転方向と反対方向に回転駆動する逆転状態とに切り換え可能なロータリ耕耘装置と、地面に接地する棒状部材によって構成され、前記ロータリ耕耘装置が前記逆転状態のときに前記ロータリ耕耘装置の地面への沈み込みを抑制する接地体と、前記走行機体から後上方に向けて延出された操縦ハンドルと、が備えられ、
前記接地体は、機体側面視で後ろ上がりに傾斜する状態で前記走行車輪と前記ロータリ耕耘装置との間に位置して、前記ロータリ耕耘装置にて耕される前の地面に接地し、
前記接地体は、前記接地体のうちの地面に接する接地作用部の地面に対する相対高さが変更されるように、前記接地体の延び方向に沿って位置変更可能に支持され、
前記接地作用部の底部に、前記接地体よりも幅広の平板状の接地部材が、機体前部側ほど上側に位置する傾斜姿勢で設けられている歩行型作業機。 A traveling machine body provided with traveling wheels and a normal state in which the traveling machine body is located at a rear portion of the traveling machine body and is rotationally driven in the same direction as the rotational direction of the traveling wheels, and a reverse state is rotationally driven in a direction opposite to the rotational direction. A possible rotary tiller and a bar-shaped member that comes into contact with the ground, and a grounding body that prevents the rotary tiller from sinking to the ground when the rotary tiller is in the reverse state, and from the traveling machine body. And a steering handle extending upward,
The grounding body is located between the traveling wheel and the rotary cultivating device in a state of inclining rearward in a side view of the machine body, and is grounded to the ground before being cultivated by the rotary cultivating device,
The grounding body is supported so that its position can be changed along the extending direction of the grounding body so that the relative height of the grounding action portion in contact with the ground of the grounding body with respect to the ground is changed .
A walk- behind work machine, in which a flat plate-shaped grounding member wider than the grounding body is provided on the bottom of the grounding action portion in an inclined posture in which the front side of the machine body is positioned higher . 前記接地作用部が、機体前部側ほど上側に位置する傾斜姿勢に設けられている請求項１に記載の歩行型作業機。 The walk-behind work machine according to claim 1, wherein the grounding action section is provided in a tilted posture that is positioned higher toward a front side of the machine body. 前記走行機体に、前記ロータリ耕耘装置に駆動力を伝達する伝動ケースが備えられ、
前記接地体は、前記伝動ケースの横側部に支持されている請求項１又は２に記載の歩行型作業機。 The traveling machine body is provided with a transmission case for transmitting a driving force to the rotary tiller.
The walk-behind work machine according to claim 1, wherein the grounding body is supported on a lateral side portion of the transmission case. 前記走行機体に、前記ロータリ耕耘装置に駆動力を伝達する伝動ケースが備えられ、
前記接地体に、前記延び方向に沿って間隔をあけて形成された複数の調整用孔が備えられ、
前記伝動ケースに支持された筒状支持部材が備えられ、
前記筒状支持部材に前記接地体がスライド可能に挿入され、前記筒状支持部材の外周側から連結部材を差し込んで前記複数の調整用孔のいずれかに係合させることで、前記接地体の前記筒状支持部材に対する位置が固定される請求項１から３のいずれか１項に記載の歩行型作業機。 The traveling machine body is provided with a transmission case for transmitting a driving force to the rotary tiller.
The grounding body is provided with a plurality of adjusting holes formed at intervals along the extending direction,
A cylindrical support member supported by the transmission case is provided,
The grounding body is slidably inserted into the tubular support member, and the connecting member is inserted from the outer peripheral side of the tubular support member to be engaged with any of the plurality of adjustment holes, thereby The walk-behind work machine according to any one of claims 1 to 3, wherein a position with respect to the tubular support member is fixed.
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