JP5502550B2

JP5502550B2 - Rotary tillage device

Info

Publication number: JP5502550B2
Application number: JP2010072762A
Authority: JP
Inventors: 卓之島田
Original assignee: Yanmar Co Ltd
Current assignee: Yanmar Co Ltd
Priority date: 2009-05-07
Filing date: 2010-03-26
Publication date: 2014-05-28
Anticipated expiration: 2030-03-26
Also published as: JP2010279351A

Description

本発明は、ロータリ耕耘装置の整地体取付構造に関する。 The present invention relates to a leveling body mounting structure for a rotary tiller.

従来、ロータリ耕耘装置の一形態として、特許文献１に開示されたものがある。すなわち、かかるロータリ耕耘装置は、リヤカバー体の先端縁部に整地機能をもたせると共に、同先端縁部に取付体を介して整地体を着脱自在に取り付けている。そして、整地体はその取付姿勢を取付体により変更自在としており、リヤカバー体の先端縁部を中心にして略水平姿勢と後方へ下り傾斜姿勢の二つの姿勢に変更させることができるようにしている。このようにして、整地体をリヤカバー体から取り外した形態、又は整地体のリヤカバー体への取付姿勢を変更することで、水田ないしは畑等の性状に適応させるようにしている。 Conventionally, there exists what was disclosed by patent document 1 as one form of a rotary tillage apparatus. That is, in this rotary tiller, the front edge of the rear cover body has a leveling function, and the leveling body is detachably attached to the front edge via the attachment body. The leveling body can be changed in its mounting posture by the mounting body, and can be changed to two postures of a substantially horizontal posture and a downwardly inclined downward posture around the front edge of the rear cover body. . In this way, the leveling body is removed from the rear cover body, or the mounting posture of the leveling body to the rear cover body is changed to adapt to the properties of paddy fields or fields.

特開２００８−１２５３６３号公報JP 2008-125363 A

ところが、前記したロータリ耕耘装置の場合、整地体の取付姿勢はリヤカバー体の先端縁部を中心にして姿勢を変更、すなわち、ほぼ同一軸芯廻りの回転移動させるだけであるために、特に砂地の畑地においては、整地体をいずれの姿勢に変更させても粘着性のないさらさらの砂は、リヤカバー体の先端部と整地体によって凸部が円滑に均平化されるだけで、耕耘爪による耕耘跡である凹部には砂が充填されて均平化されることがなかった。その結果、凹部はそのまま残されて十分に整地されていないために、圃場の仕上げ面としては美観が良くないという不具合があった。 However, in the case of the rotary tiller described above, the mounting posture of the leveling body is changed around the front edge of the rear cover body, i.e., it is only rotationally moved around the same axis. In upland fields, the smooth sand that is not sticky regardless of the position of the leveling body can be cultivated with the claws only by smoothing the convex part by the tip of the rear cover body and the leveling body. The concave portions, which were marks, were filled with sand and were not leveled. As a result, the concave portion is left as it is and is not sufficiently leveled, so that there is a problem that the aesthetic appearance is not good as a finished surface of the farm field.

そこで、本発明では、リヤカバー体の先端縁部の後方に取付体を介して整地体を取り付けたロータリ耕耘装置であって、整地体は、取付体を介してリヤカバー体の先端部への取付姿勢を変更自在となすと共に、この取付姿勢は整地体の下面に形成した整地面とリヤカバー体の先端部の下面に形成した整地面を略同一平面上に配置した第一姿勢と、整地体の整地面とリヤカバー体の先端部の整地面とを略平行に段差をもたせて配置した第二姿勢とに変更自在となし、整地体の整地面から立ち上がり状に前面を形成して、同前面を耕耘土一時滞留生起面部となして、第二姿勢では、上記耕耘土一時滞留生起面部とリヤカバー体の先端部とを前後方向に一定幅離隔させて、耕耘土一時滞留生起面部の直前方に耕耘土一時滞留空間を形成し、前記整地体の耕耘土一時滞留生起面部の上部には、土こぼれ防止体を前方へ張り出し状に設けて、第二姿勢では、土こぼれ防止体をリヤカバー体の先端部に対向状態に近接状態に配置すると共に、同土こぼれ防止体で前記耕耘土一時滞留空間の上方を被覆し、前記第二姿勢の際に、前後方向に離隔させた前記耕耘土一時滞留生起面部と前記リヤカバー体の先端部との離隔幅を、前記整地体の整地面と前記リヤカバー体の整地面との段差幅と同等ないしは段差幅の略１.５倍となして、前記耕耘土一時滞留空間の容積を、前記段差幅と前記離隔幅と前記耕耘土一時滞留生起面部の左右幅との積の値に近似させたことを特徴とするロータリ耕耘装置を提供せんとするものである。
Accordingly, in the present invention, a rotary tiller device in which a leveling body is attached to the rear edge of the rear cover body via an attachment body, and the leveling body is attached to the front end portion of the rear cover body via the attachment body. The mounting posture is a first posture in which the leveling surface formed on the lower surface of the leveling body and the leveling surface formed on the lower surface of the front end of the rear cover body are arranged on substantially the same plane, and the leveling body is adjusted. The ground and the ground leveling at the tip of the rear cover body can be freely changed to a second position that is arranged with a step in parallel, and the front surface is formed upright from the leveling surface of the leveling body, and the front surface is plowed. In the second position, the tilled soil temporarily retaining surface is separated from the tip of the tilled soil temporarily by a certain width in the front-rear direction, and the tilled soil is just before the tilled soil temporarily retaining surface. forming a temporary residence space, the ground leveling In the second position, an anti-spilling body is provided on the upper portion of the surface where the tillage soil temporarily stays, and in the second position, the anti-spilling body is disposed in a state of being close to the tip of the rear cover body. The soil spill prevention body covers the cultivated soil temporary residence space above, and in the second posture, the cultivated soil temporary residence occurrence surface portion separated from the front and rear direction and the tip of the rear cover body are separated. The width is equal to or approximately 1.5 times the level difference between the leveling surface of the leveling body and the leveling surface of the rear cover body. It is intended to provide a rotary tiller characterized by approximating the product of the separation width and the left and right width of the tilled soil temporary retention surface .

本発明は、リヤカバー体の先端縁部の後方に取付体を介して整地体を取り付けたロータリ耕耘装置であって、整地体は、取付体を介してリヤカバー体の先端部への取付姿勢を変更自在となすと共に、この取付姿勢は整地体の下面に形成した整地面とリヤカバー体の先端部の下面に形成した整地面を略同一平面上に配置した第一姿勢と、整地体の整地面とリヤカバー体の先端部の整地面とを略平行に段差をもたせて配置した第二姿勢とに変更自在となし、整地体の整地面から立ち上がり状に前面を形成して、同前面を耕耘土一時滞留生起面部となして、第二姿勢では、上記耕耘土一時滞留生起面部とリヤカバー体の先端部とを前後方向に一定幅離隔させて、耕耘土一時滞留生起面部の直前方に耕耘土一時滞留空間を形成し、前記整地体の耕耘土一時滞留生起面部の上部には、土こぼれ防止体を前方へ張り出し状に設けて、第二姿勢では、土こぼれ防止体をリヤカバー体の先端部に対向状態に近接状態に配置すると共に、同土こぼれ防止体で前記耕耘土一時滞留空間の上方を被覆し、前記第二姿勢の際に、前後方向に離隔させた前記耕耘土一時滞留生起面部と前記リヤカバー体の先端部との離隔幅を、前記整地体の整地面と前記リヤカバー体の整地面との段差幅と同等ないしは段差幅の略１.５倍となして、前記耕耘土一時滞留空間の容積を、前記段差幅と前記離隔幅と前記耕耘土一時滞留生起面部の左右幅との積の値に近似させている。
The present invention relates to a rotary tilling device in which a leveling body is attached to the rear edge of the rear cover body via an attachment body, and the leveling body changes the mounting posture of the rear cover body to the front end portion via the attachment body. The mounting posture is a first posture in which the leveling surface formed on the lower surface of the leveling body and the leveling surface formed on the lower surface of the front end portion of the rear cover body are arranged on substantially the same plane, and the leveling surface of the leveling body The front surface of the rear cover body can be freely changed to a second posture that is arranged with a level difference in parallel with the leveling surface. In the second position, the cultivated soil temporarily stays immediately before the cultivated soil temporarily staying surface by separating the cultivated soil temporarily staying surface and the tip of the rear cover body by a certain distance in the front-rear direction. It forms a space, tilling soil of the ground leveling member An anti-spilling body is provided on the upper part of the time accumulation occurrence surface part so as to project forward, and in the second posture, the anti-spilling body is disposed in the proximity of the front end of the rear cover body, and the same soil. Covering the top of the tillage soil temporary retention space with a spill prevention body, and in the second posture, the separation width between the tillage soil temporary retention occurrence surface portion separated in the front-rear direction and the front end portion of the rear cover body, The step width between the leveling surface of the leveling body and the leveling surface of the rear cover body is equal to or approximately 1.5 times the step width. It approximates the value of the product of the left and right widths of the temporarily cultivated soil surface .

このように、整地体はリヤカバー体の先端部の後方に第一姿勢と第二姿勢に変更自在に取り付けているため、整地体の姿勢を変更することで水田、畑等の性状の異なる圃場に適用することができる。 In this way, the leveling body is attached to the rear end of the rear cover body so as to be freely changeable between the first position and the second position, so by changing the position of the leveling body, it can be applied to fields with different properties such as paddy fields and fields. Can be applied.

しかも、第二姿勢では、整地体の整地面から立ち上がり状に形成した前面としての耕耘土一時滞留生起面部を、リヤカバー体の先端部と前後方向に一定幅離隔状態に配置して、同耕耘土一時滞留生起面部の直前方に耕耘土一時滞留空間を形成しているため、砂地の畑地においても耕耘土である砂は、リヤカバー体の先端部の整地面に整地されると共に、耕耘土一時滞留生起面部で進行方向へ押圧されながら、整地体の整地面で整地される。この際、耕耘土一時滞留生起面部で進行方向へ押圧される砂は、耕耘土一時滞留生起面部の直前方に形成した耕耘土一時滞留空間に一時的に滞留された状態で進行方向へ移送されて、砂地に形成された耕耘跡等の凹部に充填される。そして、その充填面は整地体の整地面で整地される。その結果、砂地の凹凸部を堅実に均平化させて整地することができて、圃場の仕上げ面としての美観を高めることができる。 In addition, in the second posture, the tilled soil temporarily staying occurrence surface portion as a front surface formed in a rising shape from the leveling surface of the leveling body is disposed in a state of being spaced apart from the front end portion of the rear cover body by a certain width, Since a temporary tilling space is formed immediately before the temporarily stagnating surface, sand that is cultivated in the field of sandy land is leveled on the leveling surface at the tip of the rear cover body and temporarily stays in the tilling soil. The ground is leveled by the leveling surface of the leveling body while being pressed in the traveling direction at the occurrence surface portion. At this time, the sand pressed in the traveling direction on the temporarily cultivated soil surface of the cultivated soil is transferred in the traveling direction in a state of being temporarily retained in the cultivated soil temporarily retaining space formed immediately before the cultivated soil temporarily retaining surface. And filled in recesses such as tillage marks formed in the sand. The filling surface is leveled by the leveling surface of the leveling body. As a result, the uneven portion of the sand can be leveled steadily and the aesthetic appearance as a finished surface of the field can be enhanced.

さらに、第二姿勢では、リヤカバー体の先端部の直後方位置に土こぼれ防止体を対向状態に近接状態に配置しているため、リヤカバー体と整地体との間から土こぼれが生じるのを防止することができる。そして、土こぼれ防止体で耕耘土一時滞留空間の上方を被覆しているため、堅実に土こぼれが防止されると共に、耕耘土一時滞留空間内に耕耘土を一時的に滞留させることができる。そのため、圃場の凹部への充填耕耘土量を確保することができる。その結果、この点からも均平性能を向上させることができる。
さらには、第二姿勢の際に、耕耘土一時滞留生起面部とリヤカバー体の先端部との離隔幅を、整地体の整地面とリヤカバー体の整地面との段差幅と同等ないしは段差幅の略１.５倍となして、前記耕耘土一時滞留空間の容積を、前記段差幅と前記離隔幅と前記耕耘土一時滞留生起面部の左右幅との積の値に近似させたことにより、耕耘跡等の凹部を充填するのに必要とされる充填耕耘土量を耕耘土一時滞留空間内に確保することができて、凹部を堅実に充填することができると共に整地することができ、その結果、第二姿勢は特に砂地等の畑地整地に好適な姿勢となすことができて、均平性能を向上させることができる。
Furthermore, in the second position, the spill prevention body is arranged in a close proximity to the opposing state at a position immediately after the front end of the rear cover body, thus preventing spillage from occurring between the rear cover body and the leveling body. can do. And since the upper part of cultivation soil temporary residence space is coat | covered with the soil spill prevention body, soil spillage is prevented firmly and cultivation soil can be temporarily retained in cultivation soil temporary residence space. Therefore, it is possible to secure the amount of tilled soil filled in the concave portion of the field. As a result, the leveling performance can be improved also from this point.
Further, in the second posture, the separation width between the temporarily cultivated soil surface and the tip of the rear cover body is equal to or substantially equal to the step width between the leveling surface of the leveling body and the leveling surface of the rear cover body. By making the volume of the tilling soil temporary residence space 1.5 times and approximating the product of the step width, the separation width, and the left and right width of the tilling soil temporary residence occurrence surface portion, It is possible to secure the amount of filled tillage soil required to fill the recesses in the tillage soil temporarily retaining space, to fill the recesses steadily and to level the ground, and as a result, The second posture can be a posture that is particularly suitable for upland field preparation such as sandy land, and leveling performance can be improved.

本発明に係る第１実施形態としてのロータリ耕耘装置の斜視図。1 is a perspective view of a rotary tiller as a first embodiment according to the present invention. 上記ロータリ耕耘装置の平面図。The top view of the said rotary tillage apparatus. 上記ロータリ耕耘装置の側面図。The side view of the said rotary tillage apparatus. リヤカバー体と整地体の連結解除状態での側面図。The side view in the connection cancellation | release state of a rear cover body and a leveling body. リヤカバー体と整地体の連結解除状態での斜視説明図。The perspective explanatory drawing in the connection cancellation | release state of a rear cover body and a leveling body. リヤカバー体と整地体の連結解除状態での側面説明図。Side surface explanatory drawing in the connection cancellation | release state of a rear cover body and a leveling body. 整地体の第一姿勢を示す側面説明図。Side surface explanatory drawing which shows the 1st attitude | position of a leveling body. 整地体の第二姿勢を示す側面説明図。Side surface explanatory drawing which shows the 2nd attitude | position of a leveling body. 本発明に係る第２実施形態としてのリヤカバー体と整地体の連結解除状態での側面説明図。Side surface explanatory drawing in the connection cancellation | release state of the rear cover body and leveling body as 2nd Embodiment which concerns on this invention. 上記整地体の第一姿勢を示す側面説明図。Side surface explanatory drawing which shows the 1st attitude | position of the said leveling body. 上記整地体の第二姿勢を示す側面説明図。Side surface explanatory drawing which shows the 2nd attitude | position of the said leveling body.

以下に本発明の実施形態（第１実施形態と第２実施形態）を、図面を参照しながら説明する。 Embodiments of the present invention (first embodiment and second embodiment) will be described below with reference to the drawings.

［第１実施形態］
図１〜図３に示すＡは本発明に係る第１実施形態としてのロータリ耕耘装置である。かかるロータリ耕耘装置Ａはトラクタ等の牽引車（図示せず）に牽引されながら圃場を耕耘することができるように構成している。 [First Embodiment]
A shown in FIGS. 1 to 3 is a rotary tiller as a first embodiment according to the present invention. The rotary tiller A is configured such that it can plow the field while being pulled by a towing vehicle (not shown) such as a tractor.

すなわち、ロータリ耕耘装置Ａは、図１〜図３に示すように、耕耘動力を伝達する伝動機構と支持機構とを兼ねる伝動・支持機構部１と、同伝動・支持機構部１に取り付けた耕深調整部２及び耕耘カバー部３とを備えている。 That is, as shown in FIGS. 1 to 3, the rotary tiller A includes a transmission / support mechanism unit 1 that doubles as a transmission mechanism and a support mechanism for transmitting tilling power, and a plow attached to the transmission / support mechanism unit 1. A depth adjustment unit 2 and a tillage cover unit 3 are provided.

そして、伝動・支持機構部１は、前面中央部と左右側部が開口して前記牽引車から動力を取り入れる伝動ギヤを収容した板金製のギヤボックス４と、同ギヤボックス４の左右側端部に内側面部を接続した左右一対の板状の連結用ブラケット５,６と、両連結用ブラケット５,６の外側面部に内側端面を接続して外側方（左右方向）に伸延させた左右一対の円筒状のメインビーム７,８と、左側のメインビーム７の外側端面に上端内側面部を接続して下方へ伸延させた伝動ケース９と、同伝動ケース９に左右に対向させると共に右側のメインビーム８の外側端面に上端部を接続して下方へ伸延させた軸受け体１０と、同軸受け体１０の下端部と上記伝動ケース９の下端部との間に横架した耕耘軸１１とから形成している。耕耘軸１１の周面には多数の耕耘爪１２を軸線方向に間隔を開けて取り付けている。 The transmission / support mechanism section 1 includes a sheet metal gear box 4 that has a front center portion and left and right side portions that are open to receive power from the towing vehicle, and left and right end portions of the gear box 4. A pair of left and right plate-like connecting brackets 5 and 6 with the inner side surface connected to each other, and a pair of left and right connecting inner end surfaces to the outer surface portions of both connecting brackets 5 and 6 and extending outward (left and right direction). Cylindrical main beams 7, 8, a transmission case 9 connected to the outer end surface of the left main beam 7 with the upper inner surface extending downward, and facing the transmission case 9 to the left and right, and the right main beam 8 is formed of a bearing body 10 having an upper end connected to the outer end face of the base 8 and extending downward, and a tilling shaft 11 laid horizontally between the lower end of the coaxial receiver 10 and the lower end of the transmission case 9. ing. A large number of tilling claws 12 are attached to the circumferential surface of the tilling shaft 11 at intervals in the axial direction.

また、図２に示すように、連結用ブラケット５,６はそれぞれ前後方向に伸延する板状に形成して、内側面中途部をギヤボックス４の左右側部に開口した開口部４ａ,４ａに面接させて連設している。連結用ブラケット５,６の各前端部には連結用ピン５ａ,６ａを外側方に突出させている。両連結用ピン５ａ,６ａには、牽引車に前端部を連結した左右一対のロワリンク（図示せず）の後端部を連結するようにしている。 Further, as shown in FIG. 2, the connecting brackets 5 and 6 are each formed in a plate shape extending in the front-rear direction, and the middle portions of the inner surface are formed in openings 4 a and 4 a that are opened on the left and right side portions of the gear box 4. Interviews are continued. Connecting pins 5a and 6a are projected outward from the front end portions of the connecting brackets 5 and 6, respectively. The rear end portions of a pair of left and right lower links (not shown) having a front end portion connected to the towing vehicle are connected to both the connecting pins 5a and 6a.

図３に示すように、ギヤボックス４の前面中央部に開口した開口部から入力軸（図示せず）を前方に向けて突出させている。入力軸にはギヤボックス４内に配設した伝動ギヤ（図示せず）を連動連結している。同伝動ギヤと伝動ケース９内に配設したチェーン機構等の伝動機構（図示せず）との間には、左右方向に伸延する伝動軸１４を左側のメインビーム７中を通して介設している。同伝動軸１４の左側端部と前記耕耘軸１１の左側端部との間に上記伝動機構を介設している。 As shown in FIG. 3, an input shaft (not shown) is protruded forward from an opening opened at the front center of the gear box 4. A transmission gear (not shown) disposed in the gear box 4 is linked to the input shaft. A transmission shaft 14 extending in the left-right direction is interposed between the transmission gear and a transmission mechanism (not shown) such as a chain mechanism disposed in the transmission case 9 through the left main beam 7. . The transmission mechanism is interposed between the left end portion of the transmission shaft 14 and the left end portion of the tillage shaft 11.

このようにして、伝動・支持機構部１では、牽引車の動力取出軸から動力を→入力軸１３→伝動ギヤ→伝動軸１４→伝動ケース９内の伝動機構→耕耘軸１１に取り入れて、同耕耘軸１１を回動させることで耕耘爪１２により圃場を耕耘するようにしている。 In this way, the transmission / support mechanism unit 1 takes power from the power take-off shaft of the towing vehicle → input shaft 13 → transmission gear → transmission shaft 14 → transmission mechanism in the transmission case 9 → cultivation shaft 11. The field is cultivated by the cultivating claws 12 by rotating the cultivating shaft 11.

耕深調整部２は、図１〜図３に示すように、前記ギヤボックス４の上面中央部に載設した連結ブラケット１５と、前記左右一対の連結用ブラケット５,６の後端部に前端部を連結した耕深フレーム枠体１６と、同耕深フレーム枠体１６の中途部と上記連結ブラケット１５の後端部との間に介設した深耕調整作動操作体１７とを具備している。 As shown in FIGS. 1 to 3, the tilling depth adjusting unit 2 has a front end at a rear end portion of the connection bracket 15 mounted on the center of the upper surface of the gear box 4 and the pair of left and right connection brackets 5 and 6. A plowing depth frame frame body 16 that is connected to each other, and a deep plowing adjustment operating body 17 that is interposed between a midway portion of the plowing depth frame frame body 16 and a rear end portion of the connection bracket 15. .

そして、連結ブラケット１５は、ギヤボックス４の上面中央部にステー１５ｃを介して、下方へ凸状に湾曲させて形成した左右一対のブラケット片１５ａ,１５ａの下端中途部を連設している。両ブラケット片１５ａ,１５ａの前端部間に連結ピン１５ｂを架設している。連結ピン１５ｂには、牽引車に前端部を連結したトップリンク（図示せず）の後端部を連結するようにしている。 The connecting bracket 15 is connected to the middle portion of the lower end of the pair of left and right bracket pieces 15a, 15a formed in a convex shape downwardly at the center of the upper surface of the gear box 4 via a stay 15c. A connecting pin 15b is installed between the front end portions of the bracket pieces 15a and 15a. The connecting pin 15b is connected to a rear end portion of a top link (not shown) having a front end portion connected to the towing vehicle.

また、耕深フレーム枠体１６は、前後方向に伸延する左右一対の前後伸延片１６ａ,１６ａと、左右方向に伸延させて両前後伸延片１６ａ,１６ａの中途部間に横架した左右伸延中途部片１６ｂと、左右方向に伸延させて両前後伸延片１６ａ,１６ａの後端部間に架設した左右伸延後端部片１６ｃとから平面視格子枠状に形成している。左右一対の前後伸延片１６ａ,１６ａは、左右一対の連結用ブラケット５,６の後端部に前端部を連設している。 Further, the tilling frame body 16 includes a pair of left and right front and rear extension pieces 16a and 16a extending in the front and rear direction, and a left and right extension middle extending horizontally between the front and rear extension pieces 16a and 16a. It is formed in a lattice frame shape in a plan view from a piece 16b and a left and right extended rear end piece 16c extending between the rear ends of the front and rear extended pieces 16a and 16a by extending in the left-right direction. The pair of left and right front and rear extension pieces 16 a and 16 a have a front end portion connected to the rear end portion of the pair of left and right connecting brackets 5 and 6.

深耕調整作動操作体１７は、図１〜図３に示すように、上下方向に伸延する作動片１７ａと、同作動片１７ａの上端部にその軸線廻りに正・逆回転自在に取り付けたハンドル状の回転操作片１７ｂとを具備して、回転操作片１７ｂを正・逆回転させることで作動片１７ａを軸線方向に伸縮させることができるように構成している。そして、前記左右一対のブラケット片１５ａ,１５ａの後端部間に左右方向の軸線廻りに回動自在に枢支片１５ｄを枢支し、同枢支片１５ｄに作動片１７ａの上端部を連結している。また、作動片１７ａの下端部は左右伸延中途部片１６ｂの中央部に連結している。 As shown in FIGS. 1 to 3, the plowing adjustment operating body 17 has an operating piece 17 a extending in the vertical direction, and a handle shape attached to the upper end portion of the operating piece 17 a so as to be rotatable forward and backward about its axis. The rotation operation piece 17b is configured so that the operation piece 17a can be expanded and contracted in the axial direction by rotating the rotation operation piece 17b forward and backward. Then, a pivotal support piece 15d is pivotally supported between the rear end portions of the pair of left and right bracket pieces 15a, 15a so as to be rotatable around a horizontal axis, and the upper end portion of the operating piece 17a is connected to the pivotal support piece 15d. doing. Moreover, the lower end part of the operation piece 17a is connected with the center part of the right-and-left extension middle piece 16b.

このようにして、回転操作片１７ｂを正・逆回転させて作動片１７ａを伸縮させると、左右一つのロワリンクとトップリンクに連結した伝動・支持機構部１を前傾姿勢と後傾姿勢との間で姿勢変更して、耕耘爪１２による耕耘深さを調整することができるようにしている。 In this way, when the rotary operation piece 17b is rotated forward / reversely to extend / contract the operation piece 17a, the transmission / support mechanism unit 1 connected to the left and right lower links and the top link is moved forward and backward. The posture is changed so that the tilling depth by the tilling claws 12 can be adjusted.

耕耘カバー部３は、図１〜図３に示すように、伝動ケース９と軸受け体１０との間に開設したロータリカバー体１８と、同ロータリカバー体１８の後端縁部１８ｃに基端縁部１９ｂを枢支・連結したリヤカバー体１９と、同リヤカバー体１９の先端縁部１９ｃに取り付けた整地体２０と、上記ロータリカバー体１８の中途部と前記連結ブラケット１５の右側中途部との間に介設したリヤカバー調整体２１と、上記ロータリカバー体１８の左右側後端縁部に前端縁部を連結したサイドカバー体２２,２２とを具備している。 As shown in FIGS. 1 to 3, the tillage cover portion 3 includes a rotary cover body 18 established between the transmission case 9 and the bearing body 10, and a base edge on a rear end edge portion 18 c of the rotary cover body 18. A rear cover body 19 that pivotally supports and connects the portion 19b, a leveling body 20 that is attached to a front edge 19c of the rear cover body 19, and a midway portion of the rotary cover body 18 and a right midway portion of the connection bracket 15. And a side cover body 22 and 22 having front end edges connected to the left and right rear end edges of the rotary cover body 18.

そして、ロータリカバー体１８は、図１〜図３に示すように、側面視にて略扇状に形成した左右一対の側方カバー片１８ａ,１８ａの先細り状下部を耕耘軸１１の外周左右側部に枢支して、両側方カバー片１８ａ,１８ａの上端縁部を上方へ凸状の円弧状に形成し、両上端縁部間に上方カバー片１８ｂを架設して正面視門型に形成している。 1 to 3, the rotary cover body 18 has a tapered lower portion of a pair of left and right side cover pieces 18 a, 18 a formed in a substantially fan shape when viewed from the side. The upper end edges of both side cover pieces 18a, 18a are formed in an upwardly convex arc shape, and the upper cover piece 18b is installed between both upper end edges to form a frontal portal type. ing.

リヤカバー体１９は、図４〜図８に示すように、前記上方カバー片１８ｂの後端縁部１８ｃに、同後端縁部１８ｃの左右幅と略同一幅の四角形状に形成したリヤカバー本片１９ａの基端縁部１９ｂを、左右方向に軸線を向けた枢軸２３により枢支して、上方カバー片１８ｂの後端縁部１８ｃから垂下状となしている。そして、リヤカバー体１９は枢軸２３を中心にリヤカバー本片１９ａを上下揺動自在となしている。また、リヤカバー本片１９ａの先端縁部１９ｃは、上方さらには前方へカール状に巻き返して屈曲形成することで、同先端縁部１９ｃの強度を補強している。先端縁部１９ｃの下端面には整地面１９ｄを形成して、同整地面１９ｄを耕耘した圃場面上に滑動させて圃場面を堅実に整地するようにしている。リヤカバー本片１９ａの上面側左右側部には、上下方向に伸延する左右一対の支持兼補強ブラケット１９ｅ,１９ｅを取り付けている。 4 to 8, the rear cover body 19 is a rear cover main piece formed on the rear end edge portion 18c of the upper cover piece 18b in a rectangular shape having substantially the same width as the left and right width of the rear end edge portion 18c. The base end edge portion 19b of 19a is pivotally supported by a pivot shaft 23 having an axis line in the left-right direction, and has a hanging shape from the rear end edge portion 18c of the upper cover piece 18b. The rear cover body 19 is configured such that the rear cover main piece 19a can swing up and down about the pivot 23. Further, the front end edge 19c of the rear cover main piece 19a is bent back and bent upward and further forward to reinforce the strength of the front end edge 19c. A leveling surface 19d is formed on the lower end surface of the leading edge 19c, and the leveling surface 19d is slid on the plowed field scene so as to steadily level the field. A pair of left and right support / reinforcement brackets 19e, 19e extending in the vertical direction are attached to the left and right sides of the upper surface of the rear cover main piece 19a.

リヤカバー体１９の先端縁部１９ｃには、図４〜図８に示すように、取付体２４,２４を介して整地体２０を着脱自在かつ姿勢変更自在に取り付けて、同整地体２０により圃場の整地効果を増大させることができるようにしている。 As shown in FIGS. 4 to 8, the leveling body 20 is attached to the front edge 19 c of the rear cover body 19 via attachment bodies 24, 24 so as to be attachable and detachable, and the posture of the field can be changed by the leveling body 20. The leveling effect can be increased.

整地体２０は、図４〜図８に示すように、リヤカバー体１９の先端縁部１９ｃの左右幅と略同一幅の四角形状に整地体本片２０ａを形成している。整地体本片２０ａは、中途部を下方へ膨出させてソリ状に形成している。そして、整地体本片２０ａの前端縁部は前上方へ屈曲させると共に、上方へ立ち上がり状に伸延させて整地体２０の前面を形成して、同前面を耕耘土一時滞留生起面部２０ｂとなしている。耕耘土一時滞留生起面部２０ｂの上部には、左右幅方向に伸延する円筒状の土こぼれ防止体２０ｃを前方へ張り出し状に設けている。整地体本片２０ａの上端縁部は、土こぼれ防止体２０ｃの後部周面に略沿わせて前方へ折曲している。なお、土こぼれ防止体２０ｃとしては、上記耕耘土一時滞留生起面部２０ｂの上端縁部を前方へ屈曲させて一体的に形成することもできる。整地体本片２０ａの下端面には整地面２０ｄを形成して、同整地面２０ｄを耕耘した圃場面上に滑動させて圃場面をより一層堅実に整地するようにしている。左右側端部には側壁片２０ｅ,２０ｅを取り付けて、整地体２０の剛性を良好に確保している。図１〜図３に示す２０ｆは補助整地体であり、同補助整地体２０ｆは、整地体２０の左右側端部に外側方に延設・張り出し状となした使用姿勢と、整地体２０上に折り畳み状となした収納姿勢とに姿勢変更自在となしている。 As shown in FIGS. 4 to 8, the leveling body 20 forms the leveling body main piece 20 a in a quadrangular shape having substantially the same width as the left and right width of the front edge 19 c of the rear cover body 19. The leveling body main piece 20a is formed in a warp shape with its midway portion bulging downward. Then, the front end edge of the leveling body main piece 20a is bent forward and upward, and is extended upward so as to form the front surface of the leveling body 20, and the front surface is used as a tilled soil temporarily retaining occurrence surface portion 20b. Yes. A cylindrical soil spill prevention body 20c extending in the left-right width direction is provided on the upper part of the temporarily cultivated soil retaining surface 20b so as to project forward. The upper edge of the leveling body main piece 20a is bent forward along the rear peripheral surface of the spill prevention body 20c. Note that the soil spill prevention body 20c can be integrally formed by bending the upper edge of the tilled soil temporarily retaining occurrence surface portion 20b forward. A leveling surface 20d is formed on the lower end surface of the leveling body main piece 20a, and the leveling surface 20d is slid onto the plowed field scene to level the field more evenly. Side wall pieces 20e and 20e are attached to the left and right end portions to ensure the rigidity of the leveling body 20 satisfactorily. 1 to 3 is an auxiliary leveling body, and the auxiliary leveling body 20f extends to the left and right end portions of the leveling body 20 and extends outwardly, The position can be freely changed to the folded storage position.

リヤカバー調整体２１は、図１〜図３に示すように、上下方向に伸延する作動片２１ａと、同作動片２１ａの上端部にその軸線廻りに正・逆回転自在に取り付けたハンドル状の回転操作片２１ｂとを具備して、回転操作片２１ｂを正・逆回転させることで作動片２１ａを軸線方向に伸縮させることができるように構成している。そして、前記上方カバー片１８ｂの後側中途部と前記連結ブラケット１５の右側中途部より右側方に延設した支持片２５との間に作動片２１ａを介設している。 As shown in FIGS. 1 to 3, the rear cover adjusting body 21 is a handle-like rotation that is attached to the upper end portion of the operating piece 21 a extending in the vertical direction so as to be rotatable forward and backward about its axis. The operation piece 21b is provided, and the operation piece 21a can be expanded and contracted in the axial direction by rotating the rotation operation piece 21b forward and backward. An operating piece 21 a is interposed between the rear halfway part of the upper cover piece 18 b and the support piece 25 extending rightward from the right middle part of the connecting bracket 15.

このようにして、前記した耕深調整時に、回転操作片２１ｂを正・逆回転させて作動片２１ａを伸縮させることで、ロータリカバー体１８を耕耘軸１１の軸芯を中心にして前後方向に回動調整して、同ロータリカバー体１８に取り付けたリヤカバー体１９の先端縁部１９ｃの整地面１９ｄが、圃場面に接地する高さに整合するように調整することができるようにしている。 In this way, when adjusting the tilling depth as described above, the rotary operation piece 21b is rotated forward and backward to expand and contract the operating piece 21a, whereby the rotary cover body 18 is moved back and forth about the axis of the tilling shaft 11. By adjusting the rotation, the ground leveling surface 19d of the front edge 19c of the rear cover body 19 attached to the rotary cover body 18 can be adjusted so as to be aligned with the height at which it contacts the field scene.

サイドカバー体２２,２２は、図１〜図３に示すように、それぞれ板状に形成して、前記側方カバー片１８ａ,１８ａの左右側後端縁部に前端縁部２２ａ,２２ａを連結して、側方カバー片１８ａ,１８ａの後端縁部からリヤカバー体１９の側端縁部までの側方を閉塞している。 The side cover bodies 22 and 22 are each formed in a plate shape as shown in FIGS. 1 to 3, and the front end edges 22a and 22a are connected to the left and right rear end edges of the side cover pieces 18a and 18a. Thus, the sides from the rear edge of the side cover pieces 18a, 18a to the side edge of the rear cover body 19 are closed.

また、ロータリカバー体１８とリヤカバー体１９との間には、図１〜図３に示すように、上下方向に伸延する左右一対のハンガーロッド２６,２６を介設して、両ハンガーロッド２６,２６によりリヤカバー体１９を支持すると共に、同リヤカバー体１９の先端縁部１９ｃが下方から上方へ突き上げられる外力を弾性手段としての圧縮スプリング２７,２７により吸収することができるようにしている。２８はハンガーロッド２６の上部を支持する上部ステー、３０はハンガーロッド連結孔２９を介してハンガーロッド２６の下部を支持する下部ステーの機能も果たす取付片である。 Further, between the rotary cover body 18 and the rear cover body 19, as shown in FIGS. 1 to 3, a pair of left and right hanger rods 26, 26 extending in the vertical direction are interposed, and both the hanger rods 26, 26, the rear cover body 19 is supported, and the external force that pushes the front edge 19c of the rear cover body 19 upward from below can be absorbed by the compression springs 27 and 27 as elastic means. Reference numeral 28 denotes an upper stay that supports the upper part of the hanger rod 26, and 30 denotes an attachment piece that also functions as a lower stay that supports the lower part of the hanger rod 26 via the hanger rod connecting hole 29.

各取付体２４は、図４〜図８に示すように、リヤカバー体１９側に設けた取付片３０と整地体２０側に設けた被取付片３１とから形成している。 Each of the attachment bodies 24 is formed of an attachment piece 30 provided on the rear cover body 19 side and an attached piece 31 provided on the leveling body 20 side, as shown in FIGS.

各取付体２４を形成する取付片３０は、図４〜図６に示すように、各支持兼補強ブラケット１９ｅの左右側面下端部から先端縁部１９ｃの上面に沿わせて同先端縁部１９ｃの先端位置まで伸延する左右一対の取付本片３０ａ,３０ａを上方へ膨出状に形成している。 As shown in FIGS. 4 to 6, the attachment piece 30 forming each attachment body 24 is formed on the tip edge portion 19 c along the upper surface of the tip edge portion 19 c from the lower left and right side lower end portions of each support / reinforcement bracket 19 e. A pair of left and right mounting pieces 30a, 30a extending to the tip position are formed in a bulging shape upward.

左右一対の取付本片３０ａ,３０ａの後縁部間には、図４〜図６に示すように、左右方向に軸線を向けて伸延する支軸片３２ａ,３２ｂを上下方向に間隔を開けて架設して取付片側係合部３２を形成している。また、左右一対の取付本片３０ａ,３０ａの中途部間には、各支軸片３２ａ,３２ｂの前上方に位置させて左右方向に開口する複数（本実施形態では各取付本片３０ａに二個ずつ）の取付片側連結孔３３ａ,３３ａ,３３ｂ,３３ｂを、上下方向に間隔を開けて開口させている。しかも、取付片側連結孔３３ａ,３３ａの中心から支軸片３２ａの軸芯までの間隔と、取付片側連結孔３３ｂ,３３ｂの中心から支軸片３２ｂの軸芯までの間隔は、等間隔となして取付片側連結部３３を形成している。 As shown in FIGS. 4 to 6, support shaft pieces 32 a and 32 b that extend in the left and right directions are spaced apart between the rear edge portions of the pair of left and right mounting main pieces 30 a and 30 a. A mounting piece side engaging portion 32 is formed by erection. In addition, between the pair of left and right mounting book pieces 30a and 30a, a plurality of openings (in the present embodiment, each mounting book piece 30a has two openings) positioned in front of and above the support shaft pieces 32a and 32b. Mounting piece side connecting holes 33a, 33a, 33b, 33b are opened at intervals in the vertical direction. Moreover, the distance from the center of the attachment piece side coupling holes 33a, 33a to the axis of the support piece 32a, and the distance from the center of the attachment piece side connection holes 33b, 33b to the axis of the support piece 32b are equal. Thus, the attachment piece side connecting portion 33 is formed.

取付体２４の他方を形成する被取付片３１は、図４〜図６に示すように、前記取付片３０,３０と前後方向に対向する整地体本片２０ａの左右側基端（前端）縁部の位置にそれぞれ設けている。そして、被取付片３１は、前記取付本片３０ａ,３０ａの左右間隔よりもやや広幅に左右方向に伸延する基部本片３１ａと、同基部本片３１ａの左右側端部から前方へ伸延させた左右一対の伸延片３１ｂ,３１ｂと、基部本片３１ａを支持する支持片３１ｃとから形成している。 As shown in FIGS. 4 to 6, the mounted piece 31 forming the other side of the mounting body 24 has left and right base end (front end) edges of the leveling body piece 20a facing the mounting pieces 30 and 30 in the front-rear direction. It is provided at each position. And the to-be-attached piece 31 was extended ahead from the base part piece 31a extended in the left-right direction a little wider than the right-and-left space | interval of the said attachment piece 30a, 30a, and the left-right side edge part of the base part piece 31a. A pair of left and right extending pieces 31b, 31b and a support piece 31c that supports the base main piece 31a are formed.

整地体本片２０ａの基端（前端）縁部において、左右一対の伸延片３１ｂ,３１ｂ間に位置する部分は一部切り欠いて、同切り欠き部分に前記支軸片３２ａないしは支軸片３２ｂに上方から係合するフック状の係合片３４ａを設けることで、左右一対の伸延片３１ｂ,３１ｂ間に被取付片側係合部３４を形成している。 In the base end (front end) edge of the leveling body piece 20a, a portion located between the pair of left and right extending pieces 31b and 31b is partially cut out, and the support piece 32a or the support piece 32b is formed in the notch. By providing a hook-like engagement piece 34a that engages from above, a mounted-piece-side engagement portion 34 is formed between the pair of left and right extension pieces 31b, 31b.

左右一対の伸延片３１ｂ,３１ｂの先端部には、左右方向に開口する被取付片側連結孔３５ａ,３５ａを開口させることで、被取付片側連結部３５を形成している。そして、被取付片側連結孔３５ａ,３５ａは、前記支軸片３２ａを支点として前記取付片側連結孔３３ａ,３３ａと左右方向に符合する一方、前記支軸片３２ｂを支点として前記連結孔３３ｂ,３３ｂと左右方向に符合するようにしている。 The attached piece side connecting portion 35 is formed by opening attached piece side connecting holes 35a, 35a that open in the left-right direction at the distal ends of the pair of left and right extending pieces 31b, 31b. The attached piece side connection holes 35a and 35a are aligned with the attachment piece side connection holes 33a and 33a in the left-right direction with the support shaft piece 32a as a fulcrum, while the connection holes 33b and 33b with the support piece 32b as a fulcrum. And the left and right direction.

そして、図６に示すように、支軸片３２ａに係合片３４ａを係合させて、同支軸片３２ａを支点として取付片側連結孔３３ａ,３３ａと被取付片側連結孔３５ａ,３５ａとを符合させ、これら連結孔中に連結ピン３６を抜き差し自在に挿通して、取付片３０と被取付片３１とを連結することで、整地体２０の姿勢を図７に示す第一姿勢（ａ）となすことができるようにしている。３７は抜け止めピンである。 Then, as shown in FIG. 6, the engagement piece 34a is engaged with the support shaft piece 32a, and the attachment piece side connection holes 33a, 33a and the attachment piece side connection holes 35a, 35a are formed using the support shaft piece 32a as a fulcrum. First, the posture of the leveling body 20 is shown in FIG. 7 by inserting the connecting pin 36 into the connecting holes so as to be freely inserted and removed, and connecting the attachment piece 30 and the attachment piece 31. So that you can Reference numeral 37 denotes a retaining pin.

かかる第一姿勢（ａ）では、図７にも示すように、整地体２０の下面に形成した整地面２０ｄと、リヤカバー体１９の先端縁部１９ｃの下面に形成した整地面１９ｄとが、略同一平面である略同一圃場整地面Ｐ１上に配置されるようにしている。ここで、土こぼれ防止体２０ｃは、リヤカバー体１９の先端縁部１９ｃの直上方位置に配置されると共に、耕耘土一時滞留生起面部２０ｂとリヤカバー体１９の先端縁部１９ｃとは前後方向に近接状態に配置されるようにしている。 In the first posture (a), as shown in FIG. 7, the leveling surface 20 d formed on the lower surface of the leveling body 20 and the leveling surface 19 d formed on the lower surface of the front edge 19 c of the rear cover body 19 are substantially the same. It arrange | positions on the substantially identical agricultural field leveling ground P1 which is the same plane. Here, the soil spill prevention body 20c is disposed at a position immediately above the front end edge 19c of the rear cover body 19, and the tilled soil temporarily retaining surface 20b and the front end edge 19c of the rear cover body 19 are close to each other in the front-rear direction. It is arranged in the state.

一方、図６に示すように、支軸片３２ｂに係合片３４ａを係合させて、同支軸片３２ｂを支点として取付片側連結孔３３ｂ, ３３ｂと、被取付片側連結孔３５ａ,３５ａとを符合させ、これら連結孔中に連結ピン３６を抜き差し自在に挿通して、取付片３０と被取付片３１とを連結することで、整地体２０の姿勢を図８に示す第二姿勢（ｂ）となすことができるようにしている。 On the other hand, as shown in FIG. 6, the engaging piece 34a is engaged with the supporting shaft piece 32b, and the attaching piece side connecting holes 33b, 33b and the attached piece side connecting holes 35a, 35a are used with the supporting shaft piece 32b as a fulcrum. , And the connecting pin 36 is inserted into the connecting holes so as to be freely inserted and removed, and the attachment piece 30 and the attachment piece 31 are connected to each other, whereby the posture of the leveling body 20 is changed to the second posture (b shown in FIG. ).

かかる第二姿勢（ｂ）では、図８にも示すように、先行圃場整地面Ｐ２を形成するリヤカバー体１９の先端縁部１９ｃの整地面１９ｄと、後続圃場整地面Ｐ３を形成する整地体２０の整地面２０ｄとが略平行に段差（整地面１９ｄが上方位置で整地面２０ｄが下方位置）を形成して配置されるようにしている。ここで、土こぼれ防止体２０ｃは、リヤカバー体１９の先端縁部１９ｃの直後方位置に配置されると共に、整地体２０の耕耘土一時滞留生起面部２０ｂとリヤカバー体１９の先端縁部１９ｃとは、前後方向に一定幅離隔されて、耕耘土一時滞留生起面部２０ｂの直前方に耕耘土一時滞留空間Ｓが形成されるようにしている。具体的には、耕耘土一時滞留生起面部２０ｂとリヤカバー体１９の先端縁部１９ｃとは前後方向に一定幅離隔されると共に、その離隔幅Ｌは整地体２０の整地面２０ｄとリヤカバー体１９の先端縁部１９ｃの整地面１９ｄとの段差幅Ｚと同等ないしは段差幅Ｚの略１.５倍となるようにしている。従って、耕耘土一時滞留空間Ｓの容積は、段差幅Ｚと離隔幅Ｌと耕耘土一時滞留生起面部２０ｂの左右幅との積の値に近似する。 In this second posture (b), as shown in FIG. 8, the leveling surface 19d of the front edge 19c of the rear cover body 19 that forms the preceding field leveling surface P2, and the leveling body 20 that forms the subsequent field leveling surface P3. The leveling surface 20d is arranged substantially in parallel to form a step (the leveling surface 19d is an upper position and the leveling surface 20d is a lower position). Here, the soil spill prevention body 20c is disposed at a position immediately after the front edge 19c of the rear cover body 19, and the tilled soil temporarily retaining surface 20b of the leveling body 20 and the front edge 19c of the rear cover 19 are defined. The cultivation soil temporary residence space S is formed in front of the cultivation soil temporary residence occurrence surface portion 20b with a certain distance in the front-rear direction. Specifically, the cultivated soil temporary retention surface 20b and the front edge 19c of the rear cover body 19 are separated by a certain width in the front-rear direction, and the separation width L is equal to that of the leveling surface 20d of the leveling body 20 and the rear cover body 19. It is set to be equal to or substantially 1.5 times the step width Z of the tip edge portion 19c with the leveling ground 19d. Accordingly, the volume of the temporarily cultivated soil space S approximates the value of the product of the step width Z, the separation width L, and the left and right width of the temporarily cultivated soil surface 20b.

そして、第二姿勢（ｂ）では、土こぼれ防止体２０ｃがリヤカバー体１９の先端縁部１９ｃに前後方向に対向して近接状態に配置されると共に、同土こぼれ防止体２０ｃで前記耕耘土一時滞留空間Ｓの上方が被覆されるようにしている。 In the second posture (b), the soil spill prevention body 20c is disposed in a close proximity to the front edge 19c of the rear cover body 19 in the front-rear direction, and the soil spill prevention body 20c temporarily The upper part of the stay space S is covered.

結局、整地体２０は、取付体２４,２４を介して、土こぼれ防止体２０ｃがリヤカバー体１９の先端縁部１９ｃの直上方位置から直後方位置に移動されると共に、耕耘土一時滞留生起面部２０ｂがリヤカバー体１９の先端縁部１９ｃに近接した位置から一定幅離隔した位置に移動されて、第一姿勢（ａ）から第二姿勢（ｂ）に姿勢変更されるようにしている。また、整地体２０は上記とは反対に移動されて、第二姿勢（ｂ）から第一姿勢（ａ）に姿勢変更されるようにしている。 Eventually, in the leveling body 20, the spill prevention body 20 c is moved from the position directly above the front edge 19 c of the rear cover body 19 to the rear position via the mounting bodies 24, 24, and the tilled soil temporarily staying surface portion is generated. The position 20b is moved from the position close to the front edge 19c of the rear cover body 19 to a position separated by a certain width, so that the position is changed from the first position (a) to the second position (b). Further, the leveling body 20 is moved in the opposite direction to the above, and the posture is changed from the second posture (b) to the first posture (a).

本発明に係る実施形態は上記のように構成しているものであり、整地体２０はリヤカバー体１９の先端縁部１９ｃの後方に図７に示す第一姿勢（ａ）と図８に示す第二姿勢（ｂ）に変更自在に取り付けているため、整地体２０の姿勢を変更することで水田、畑等の性状の異なる圃場に適用することができる。例えば、整地体２０の姿勢は、水田では第一姿勢（ａ）、砂地の畑等では第二姿勢（ｂ）を採択することができる。 The embodiment according to the present invention is configured as described above, and the leveling body 20 has a first posture (a) shown in FIG. 7 and a first posture shown in FIG. 8 behind the front edge 19c of the rear cover body 19. Since the two postures (b) are variably attached, the posture of the leveling body 20 can be changed and applied to farm fields having different properties such as paddy fields and fields. For example, as the posture of the leveling body 20, the first posture (a) can be adopted for paddy fields, and the second posture (b) can be adopted for sandy fields.

すなわち、第一姿勢（ａ）では、耕耘土一時滞留生起面部２０ｂとリヤカバー体１９の先端縁部１９ｃとが前後方向に近接状態に配置されて、整地体２０の整地面２０ｄとリヤカバー体１９の先端縁部１９ｃの整地面１９ｄが略同一平面Ｐ上に近接状態に配置されるため、これら整地面１９ｄ,２０ｄに土塊や残渣物等が引っ掛かることがなく、また、これら整地面１９ｄ,２０ｄ間から整地体２０の上面側に土こぼれが生じるのを防止することができる。その結果、これらの整地面１９ｄ,２０ｄを機能上一つの整地面とみなすことができて、第一姿勢（ａ）は水田整地に好適な姿勢となすことができる。 That is, in the first posture (a), the tilling soil temporary retention surface portion 20b and the tip edge portion 19c of the rear cover body 19 are arranged in proximity to each other in the front-rear direction, and the leveling surface 20d of the leveling body 20 and the rear cover body 19 Since the leveling surface 19d of the tip edge portion 19c is arranged in a close proximity on the substantially same plane P, no soil blocks or residues are caught on the leveling surfaces 19d and 20d, and between the leveling surfaces 19d and 20d. Therefore, it is possible to prevent spillage from occurring on the upper surface side of the leveling body 20. As a result, these leveling surfaces 19d and 20d can be regarded as one functional leveling surface, and the first posture (a) can be a suitable posture for paddy field leveling.

そして、第二姿勢（ｂ）では、整地体２０の整地面２０ｄから立ち上がり状に形成した前面としての耕耘土一時滞留生起面部２０ｂが、リヤカバー体１９の先端縁部１９ｃと前後方向に一定幅離隔状態に配置されて、同耕耘土一時滞留生起面部２０ｂの直前方に耕耘土一時滞留空間Ｓが形成されるため、砂地の畑地においても耕耘土である砂は、リヤカバー体１９の先端縁部１９ｃの整地面１９ｄに整地されると共に、耕耘土一時滞留生起面部２０ｂで進行方向へ押圧されながら、整地体２０の整地面２０ｄで整地される。 In the second posture (b), the tilled soil temporary retention surface 20b as a front surface formed so as to rise from the leveling surface 20d of the leveling body 20 is separated from the front end edge 19c of the rear cover body 19 by a certain width in the front-rear direction. Since the cultivated soil temporary residence space S is formed immediately before the cultivated soil temporary residence surface 20b, the sand that is cultivated soil in the sandy field is the tip edge portion 19c of the rear cover body 19. The ground leveling is carried out by the leveling surface 20d of the leveling body 20 while being leveled by the ground leveling surface 19d and being pressed in the traveling direction by the cultivated soil temporarily retaining surface 20b.

この際、耕耘土一時滞留生起面部２０ｂで進行方向へ押圧される砂は、耕耘土一時滞留生起面部２０ｂの直前方に形成した耕耘土一時滞留空間Ｓに一時的に滞留された状態で進行方向へ移送されて、砂地に形成された耕耘跡等の凹部に充填される。そして、その充填面は整地体２０の整地面２０ｄで整地される。その結果、砂地の凹凸部を堅実に均平化させて整地することができて、圃場の仕上げ面としての美観を高めることができる。 At this time, the sand pressed in the traveling direction by the temporarily cultivated soil surface 20b is in the traveling direction in a state of being temporarily retained in the cultivated soil temporarily retaining space S formed immediately before the cultivated soil temporarily retaining surface 20b. And is filled in a recess such as a tilling mark formed in the sand. The filling surface is leveled by the leveling surface 20 d of the leveling body 20. As a result, the uneven portion of the sand can be leveled steadily and the aesthetic appearance as a finished surface of the field can be enhanced.

特に、第二姿勢（ｂ）では、耕耘土一時滞留生起面部２０ｂとリヤカバー体１９の先端縁部１９ｃとが前後方向に一定幅離隔されると共に、その離隔幅Ｌは整地体２０の整地面２０ｄとリヤカバー体１９の先端縁部１９ｃの整地面１９ｄとの段差幅Ｚと同等ないしは段差幅の略１.５倍となしているため、リヤカバー体１９の先端縁部１９ｃの整地面２０と整地体２０の整地面２０ｄとの間に耕耘土一時滞留空間Ｓとしては十分な空間が確保される。そのため、凹部を充填するのに必要とされる充填耕耘土量を耕耘土一時滞留空間Ｓ内に確保することができて、凹部を堅実に充填することができると共に整地することができる。その結果、第二姿勢（ｂ）は特に砂地等の畑地整地に好適な姿勢となすことができて、均平性能を向上させることができる。 In particular, in the second posture (b), the tilling soil temporary retention surface 20b and the front edge 19c of the rear cover body 19 are separated by a certain width in the front-rear direction, and the separation width L is the ground leveling 20d of the leveling body 20. And the step width Z of the rear edge 19c of the rear cover body 19 is equal to or approximately 1.5 times the step width Z of the leveling ground 19d. Sufficient space is secured as the cultivated soil temporary residence space S between the 20 leveling surfaces 20d. Therefore, it is possible to ensure the amount of filling tillage necessary for filling the recess in the tilling soil temporarily staying space S, to fill the recess firmly and to level the ground. As a result, the second posture (b) can be a particularly suitable posture for upland field preparation such as sand, and leveling performance can be improved.

ここで、前記した離隔幅Ｌは、段差幅Ｚの略１.５倍よりも大きくすると、リヤカバー体１９の先端縁部１９ｃからの整地体２０の前後長が長くなり、耕耘爪軸から整地体２０の先端縁部までの距離が長くなる。そのため、機体を後進させることや、畝ぎりぎりでロータリ耕耘装置Ａを降下して駆動しながら前進させることがある枕地整地作業時には、未耕地部分が多くなり、作業効率が低下するという不具合がある。 Here, when the above-mentioned separation width L is larger than about 1.5 times the step width Z, the front-rear length of the leveling body 20 from the front edge 19c of the rear cover body 19 becomes longer, and the leveling body from the tilling claw shaft becomes longer. The distance to the tip edge of 20 becomes long. Therefore, there is a problem in that the uncultivated land portion increases and the work efficiency decreases during headland leveling work in which the machine body is moved backward or the rotary tiller A is moved forward while being driven at the last minute. .

また、第二姿勢（ｂ）では、リヤカバー体１９の先端縁部１９ｃの直後方位置に土こぼれ防止体２０ｃが前後対向状態にて近接状態に配置されているため、リヤカバー体１９と整地体２０との間から整地体２０の上面側に土こぼれが生じるのを防止することができる。そして、土こぼれ防止体２０ｃで耕耘土一時滞留空間Ｓの上方を被覆しているため、堅実に土こぼれが防止されると共に、耕耘土一時滞留空間Ｓ内に耕耘土を一時的に滞留させることができる。そのため、圃場の凹部への充填耕耘土量を確保することができる。その結果、この点からも均平性能を向上させることができる。 Further, in the second posture (b), since the spill prevention body 20c is disposed in a proximity state in a front-rear facing state at a position immediately behind the front edge 19c of the rear cover body 19, the rear cover body 19 and the leveling body 20 are disposed. It is possible to prevent spilling on the upper surface side of the leveling body 20 from between the two. And since the upper part of the cultivation soil temporary residence space S is covered with the soil spill prevention body 20c, soil spillage is prevented steadily and the cultivation soil is temporarily retained in the cultivation soil temporary residence space S. Can do. Therefore, it is possible to secure the amount of tilled soil filled in the concave portion of the field. As a result, the leveling performance can be improved also from this point.

［第２実施形態］
図９〜図１１は、本発明に係る第２実施形態としてのロータリ耕耘装置Ａのリヤカバー体１９と整地体２０を図示している。第２実施形態としてのロータリ耕耘装置Ａは、第１実施形態のロータリ耕耘装置Ａと基本的構造を同じくしているが、リヤカバー体１９及び整地体２０の一部の構造において構成を異にする。 [Second Embodiment]
FIGS. 9-11 has shown the rear cover body 19 and the leveling body 20 of the rotary tilling apparatus A as 2nd Embodiment based on this invention. The rotary tiller A as the second embodiment has the same basic structure as the rotary tiller A according to the first embodiment, but the structures of the rear cover body 19 and part of the leveling body 20 are different. .

すなわち、整地面２０ｄを形成する整地体２０の整地体本片２０ａの前端縁部から略垂直に上方へ立ち上げて耕耘土一時滞留生起面部２０ｂを形成している。このようにして、整地体２０の整地体本片２０ａの前端縁部と耕耘土一時滞留生起面部２０ｂの下端縁部とが略直交状態に接続（側面視略９０度の角部を形成）する接続部４０となしている。そして、接続部４０は、第一姿勢（ａ）では圃場面（略同一圃場整地面Ｐ１）と接触しない非接地面部となす一方、前記第二姿勢（ｂ）では圃場面（後続圃場整地面Ｐ３）と接触する接地面部となしている。しかも、接地面部は圃場面と接触する面の曲率半径を可及的に小となして圃場面（後続圃場整地面Ｐ３）と略線接触するようにしている。換言すると、整地体２０の前下側部に角部を形成する接続部４０は後続圃場整地面Ｐ３に略線接触するものの、整地面２０ｄは接続部４０を支点として上方へ跳ね上げられて後続圃場整地面Ｐ３とは非接触状態の姿勢を採るようにしている。 That is, the cultivated soil temporary retention surface portion 20b is formed by rising upward substantially vertically from the front edge of the leveling body main piece 20a of the leveling body 20 forming the leveling surface 20d. In this manner, the front end edge of the leveling body main piece 20a of the leveling body 20 and the lower end edge of the tilled soil temporary retention surface 20b are connected in a substantially orthogonal state (forms a corner of approximately 90 degrees in side view). The connection part 40 is provided. The connecting portion 40 is a non-grounding surface portion that does not come into contact with the farm scene (substantially the same field leveling ground P1) in the first position (a), while the field scene (subsequent field leveling ground P3) in the second position (b). ). In addition, the ground contact surface portion makes the curvature radius of the surface in contact with the farm scene as small as possible so as to make a substantially line contact with the farm scene (following farm field leveling surface P3). In other words, the connecting portion 40 that forms a corner on the front lower side portion of the leveling body 20 is substantially in line contact with the subsequent field leveling surface P3, but the leveling surface 20d is flipped upward with the connecting portion 40 as a fulcrum to follow. A posture in a non-contact state with the agricultural field leveling surface P3 is adopted.

第２実施形態は上記のように構成しており、第二姿勢（ｂ）では、第１実施形態における場合と同様に、圃場耕耘面を整地するのに必要な土砂を耕耘土一時滞留空間Ｓに一時的に滞留させることができる。そのため、砂地等畑地での耕耘性能（均平性能）を向上させることができる。その結果、リヤカバー体１９と整地体２０とを一体的に協働させて、畑向けのリヤカバーとして機能させることができる。 The second embodiment is configured as described above. In the second posture (b), as in the case of the first embodiment, the soil necessary for leveling the field cultivation surface is cultivated soil temporarily retaining space S. Can be temporarily retained. Therefore, it is possible to improve tillage performance (flatness performance) in upland fields such as sand. As a result, the rear cover body 19 and the leveling body 20 can be made to cooperate together and function as a rear cover for the field.

この際、整地体２０は跳ね上げ姿勢となすことで、整地体２０の整地面２０ｄと耕耘土一時滞留生起面部２０ｂとが接続する接続部４０だけが圃場面（後続圃場整地面Ｐ３）と略線接触する接地面部となすことができる。そのため、接地面部の接地面積を整地面２０ｄが面接触する場合に比してきわめて小さくすることができる。その結果、接地面部である接続部４０だけが圃場面（後続圃場整地面Ｐ３）に作用する整地圧を、整地面２０ｄが面接触する場合に比してきわめて高くすることができて、整地体２０の見掛けの重量を大きくすることができる。したがって、砂地等畑地での均平性を向上させることができる。しかも、整地体２０を第一姿勢（ａ）から接地圧の高い第二姿勢（ｂ）に楽に姿勢変更することができるため、均平性能とともに作業性能も高めることができる。 At this time, since the leveling body 20 is in the flip-up posture, only the connection portion 40 where the leveling surface 20d of the leveling body 20 and the tilled soil temporary retention surface 20b are connected is substantially the same as the field scene (following field leveling ground P3). It can be used as a grounding surface part in line contact. For this reason, the ground contact area of the ground contact surface portion can be made extremely small as compared with the case where the leveling surface 20d is in surface contact. As a result, the leveling pressure acting only on the field scene (following field leveling ground surface P3) only by the connecting portion 40 as the ground plane surface part can be made extremely higher than when the leveling surface 20d comes into surface contact with the leveling body. The apparent weight of 20 can be increased. Therefore, it is possible to improve the levelness in upland fields such as sand. In addition, since the leveling body 20 can be easily changed from the first posture (a) to the second posture (b) having a high contact pressure, the work performance can be improved along with the leveling performance.

また、取付片側係合部３２と取付片側連結部３３を適宜増設することで、整地体２０の第二姿勢（ｂ）における跳ね上げ姿勢の角度を調整して、整地面２０ｄが圃場面と面接触する面積（前後幅）を調整することもできる。そうすることで、整地面２０ｄが圃場面に作用する接地圧、換言すると整地体２０の見掛けの重量を変更することができる。その結果、圃場や作業に適応させてリヤカバー体１９に対する整地体２０の姿勢を適宜変更することができる。したがって、リヤカバー体１９への整地体２０の取付姿勢の選択により、水田、畑等、性状の異なる圃場に簡単かつ迅速に適応させることができる。 Further, by appropriately adding the attachment piece side engaging portion 32 and the attachment piece side connecting portion 33, the angle of the flip-up posture in the second posture (b) of the leveling body 20 is adjusted, so that the leveling surface 20d becomes the field scene and the surface. The contact area (front-rear width) can also be adjusted. By doing so, the ground pressure at which the leveling surface 20d acts on the field scene, in other words, the apparent weight of the leveling body 20 can be changed. As a result, the posture of the leveling body 20 with respect to the rear cover body 19 can be appropriately changed according to the field and work. Therefore, by selecting the mounting posture of the leveling body 20 to the rear cover body 19, it is possible to easily and quickly adapt to farm fields having different properties such as paddy fields and fields.

なお、第一姿勢（ａ）となした整地体２０は、土塊や残渣物が引っ掛からず、機能上、仮想の一つの広いリヤカバー体整地面とみなすことができる。また、土塊や残渣物が引っ掛けないため、耕耘後の圃場表面を荒らすことがなく水田での耕耘性能を低下させることがない。その結果、リヤカバー体１９と整地体２０とを一体的に協働させて、水田向けのリヤカバーとして機能させることができる。 Note that the ground leveling body 20 in the first posture (a) does not catch a lump or residue, and can be regarded as a functionally wide single rear cover body leveling surface. Moreover, since no clod or residue is caught, the field surface after tillage is not roughened and the tillage performance in the paddy field is not deteriorated. As a result, the rear cover body 19 and the leveling body 20 can be integrated to function as a rear cover for paddy fields.

砂地でも堅実に整地することができるリヤカバー体と整地体との取付構造を提供することができる。 It is possible to provide a mounting structure between the rear cover body and the leveling body that can be leveled even on sand.

Ａロータリ耕耘装置
１伝動・支持機構部
２耕深調整部
３耕耘カバー部
４ギヤボックス
５,６連結用ブラケット
７,８メインビーム
１９リヤカバー体
２０整地体
３０取付片
３１被取付片
３２取付片側係合部
３３取付片側連結部
３４被取付片側係合部
３５取付片側連結部 A Rotary Plowing Device 1 Transmission / Support Mechanism 2 Plowing Depth Adjustment 3 Plowing Cover 4 Gearbox 5, 6 Connecting Bracket 7, 8 Main Beam 19 Rear Cover 20 Leveling 30 Attachment Piece 31 Attachment Piece 32 Attachment Piece Side Engagement Joint portion 33 Mounting piece side connecting portion 34 Mounted piece side engaging portion 35 Mounting piece side connecting portion

Claims

A rotary tilling device in which a leveling body is attached to the rear edge of the rear cover body via an attachment body,
The leveling body can freely change the mounting posture of the rear cover body through the mounting body, and the mounting posture is formed on the ground leveling surface formed on the lower surface of the leveling body and the leveling surface formed on the lower surface of the front end portion of the rear cover body. The first posture in which the ground is arranged on substantially the same plane and the second posture in which the leveling ground of the leveling body and the ground leveling of the tip of the rear cover body are arranged in a substantially parallel step are provided.
The front surface is formed in a rising shape from the leveling surface of the leveling body, and the front surface is used as a temporarily cultivated surface of the cultivated soil,
In the second position, the cultivated soil temporary retention space is formed in front of the cultivated soil temporary retention surface by separating the cultivated soil temporary retention surface and the tip of the rear cover by a certain width in the front-rear direction .
A spill prevention body is provided on the top of the cultivated soil temporary staying surface of the leveling body so as to project forward, and in the second position, the spill prevention body is placed close to the front end of the rear cover body. And arrange the top of the cultivated soil temporary retention space with the soil spill prevention body,
In the second posture, the separation width between the cultivated soil temporary retention occurrence surface portion separated in the front-rear direction and the front end portion of the rear cover body is set as a step between the leveling surface of the leveling body and the leveling surface of the rear cover body. It is equal to the width or approximately 1.5 times the step width, and the volume of the temporary tilling space is set to the product of the step width, the separation width, and the left and right width of the tilling soil temporarily accumulating surface portion. A rotary tiller characterized by approximation .