JP4896697B2

JP4896697B2 - Rotary tiller

Info

Publication number: JP4896697B2
Application number: JP2006341346A
Authority: JP
Inventors: 健司大西; 通生田井; 啓輔山下
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2006-12-19
Filing date: 2006-12-19
Publication date: 2012-03-14
Anticipated expiration: 2026-12-19
Also published as: JP2008148642A

Description

本発明は、ロータリ耕耘機に関するものである。 The present invention relates to a rotary cultivator.

従来、圃場を耕耘するのに、トラクタの後部に三点リンク機構等を介して着脱自在且つ昇降自在に装着されて、圃場を移動しながら耕耘するロータリ耕耘機がある（特許文献１参照）。
このロータリ耕耘機は、三点リンク機構に連結される機枠と、この機枠の下部に設けられたロータリ耕耘部と、このロータリ耕耘部を覆うロータリカバーとを備えている。
ロータリカバーは、ロータリ耕耘部の上方を覆う上部カバーと、ロータリ耕耘部の後方を覆う後部カバーとを備えており、上部カバーは機枠側に固定され、後部カバーは、その前端側が上部カバーの後端側に左右方向に配置された支軸を介して左右軸回りに回動自在に支持されていて上下揺動自在とされていると共に、耕耘時において、後方に向かうに従って下方に移行する傾斜状に配置されていて、後端側が圃場に接地して該圃場を整地する。 Conventionally, to cultivate a farm field, there is a rotary cultivator that is detachably mounted on a rear part of a tractor via a three-point link mechanism or the like and cultivated while moving the farm field (see Patent Document 1).
The rotary tiller includes a machine frame connected to a three-point link mechanism, a rotary tiller provided at a lower portion of the machine frame, and a rotary cover that covers the rotary tiller.
The rotary cover includes an upper cover that covers the top of the rotary tiller and a rear cover that covers the rear of the rotary tiller. The upper cover is fixed to the machine frame side, and the front cover has a front end that is the upper cover. An inclination that is supported so as to be pivotable around the left and right axis via a support shaft disposed in the left and right direction on the rear end side, and that can swing up and down, and that moves downward as it moves backward. The rear end side touches the field and levels the field.

また、ロータリ耕耘機にあっては、機枠と後部カバーの背面とにわたって、後部カバーを接地方向に付勢するカバー弾下装置が左右一対設けられている。
このカバー弾下装置は、長さ方向伸縮不能なロッド部材と、このロッド部材に套嵌されたコイルバネと、ロッド部材が挿通されていて該ロッド部材に対して軸心方向に相対移動自在なホルダと、前記コイルバネの端部の位置決めをするバネ受部材とを備えている。
ロッド部材の前端側は、機枠側に固定された前取付部に左右軸回り回動自在に枢支連結され、ホルダは後部カバーの背面側に設けられた後取付部に左右軸回り回動自在に支持されており、コイルバネはホルダと前取付部との間に配置され、バネ受部材はコイルバネと前取付部との間に配置されている。 In the rotary tiller, a pair of left and right cover lowering devices that urge the rear cover in the grounding direction are provided across the machine frame and the rear surface of the rear cover.
This cover lowering device includes a rod member that is not extendable in the length direction, a coil spring that is fitted to the rod member, and a holder through which the rod member is inserted and that is relatively movable in the axial direction with respect to the rod member. And a spring receiving member for positioning the end of the coil spring.
The front end side of the rod member is pivotally connected to a front mounting portion fixed on the machine frame side so as to be rotatable about the left and right axis, and the holder is rotated about the left and right axis to a rear mounting portion provided on the back side of the rear cover. The coil spring is disposed between the holder and the front mounting portion, and the spring receiving member is disposed between the coil spring and the front mounting portion.

ロッド部材の後端側には、該ロッド部材がホルダから前側に抜けるのを防止する抜止め部が設けられ、バネ受部材は、ロッド部材に設けられた係合溝に係脱自在に係合して該バネ受部材のロッド軸心方向（ロッド長さ方向）の移動規制をするキー部材を有する。
バネ受部材のキー部材が係合する係合溝はロッド部材の軸心方向に間隔をおいて
複数形成されており、キー部材を係合溝から離脱させると共にバネ受部材をロッド部材軸心方向にスライドさせてキー部材を他の係合溝に係合させることによりバネ受部材がロッド部材に対して軸心方向に位置変更可能とされている。 On the rear end side of the rod member, a retaining portion is provided to prevent the rod member from coming out of the holder to the front side, and the spring receiving member is detachably engaged with an engagement groove provided on the rod member. And a key member for restricting movement of the spring receiving member in the rod axial direction (rod length direction).
A plurality of engaging grooves with which the key member of the spring receiving member engages are formed at intervals in the axial direction of the rod member. The key receiving member is separated from the engaging groove and the spring receiving member is moved in the axial direction of the rod member. By sliding the key member into another engagement groove, the position of the spring receiving member can be changed in the axial direction with respect to the rod member.

前記構成のカバー弾下装置にあっては、耕耘時においては、後部カバーの後端側が接地すると共にコイルバネがバネ受部材とホルダとの間で圧縮状態とされていて、後部カバーは上下揺動可能であると共にコイルバネの付勢力によって接地方向に付勢されている。
また、前記カバー弾下装置にあっては、ホルダにロックピンが設けられており、このロックピンはロッド部材に形成されたロック孔に係合することによりロッド部材に対するホルダのロッド軸心方向の相対移動を規制して後部カバーの下方揺動を規制するよう構成されている。 In the cover lowering device having the above configuration, the rear end side of the rear cover is grounded and the coil spring is compressed between the spring receiving member and the holder during tilling, and the rear cover swings up and down. It is possible and is biased in the grounding direction by the biasing force of the coil spring.
In the cover lowering device, the holder is provided with a lock pin, and the lock pin engages with a lock hole formed in the rod member to thereby move the holder in the axial direction of the rod axis of the holder. The relative movement is restricted and the downward swing of the rear cover is restricted.

このロックピンは該ロックピンをロック孔から外れたロック解除位置に保持可能とされ、ロックピンをロック解除位置に保持することによりロッド部材に対するホルダのロッド部材軸心方向の相対移動が許容される。
また、ホルダには、ロックピンをロック孔に対して係合可能な状態としたときに該ロックピンをロック孔に係合する方向に付勢するバネ部材が設けられている。
前述したロータリ耕耘機にあっては、耕耘時においては、前記ロックピンをロック解除位置に保持しておいてロッド部材に対するホルダのロッド部材軸心方向の相対移動を許容するようにしておく。 The lock pin can be held in an unlock position where the lock pin is removed from the lock hole, and by holding the lock pin in the lock release position, relative movement of the holder relative to the rod member in the axial direction of the rod member is allowed. .
Further, the holder is provided with a spring member that urges the lock pin in a direction to engage the lock hole when the lock pin is brought into an engageable state with the lock hole.
In the rotary cultivator described above, at the time of tilling, the lock pin is held at the unlocking position so as to allow relative movement of the holder in the axial direction of the rod member with respect to the rod member.

また、ロータリ耕耘部又はロータリカバー等をメンテナンス等する際においては、バネ受部材のキー部材を係合溝から離脱する位置にして該バネ受部材をロッド部材軸心方向にスライド自在な状態にしておくと共にロックピンをロック孔に係合可能な状態にして後部カバーを持ち上げて上方に揺動させると、ロックピンがバネ部材の付勢力によって自動的にロック孔に係合し、後部カバーを地面から大きく上昇させた位置でロックすることができるように構成されている。
また、作業時において、ロックピンによって後部カバーの接地部分が地面から少し浮いた状態で該後部カバーを保持し、この状態で耕耘作業をする場合がある。
特開２００５−１４３３９０号公報 Also, when performing maintenance or the like on the rotary tiller or the rotary cover, the key member of the spring receiving member is positioned so as to be disengaged from the engaging groove so that the spring receiving member can slide in the axial direction of the rod member. When the rear cover is lifted and swung upward with the lock pin engageable with the lock hole, the lock pin is automatically engaged with the lock hole by the biasing force of the spring member, and the rear cover is moved to the ground. It is configured so that it can be locked at a position that is greatly elevated.
Further, during the work, the rear cover may be held in a state where the grounding portion of the rear cover is slightly lifted from the ground by the lock pin, and the tilling work may be performed in this state.
JP 2005-143390 A

前記従来のロータリ耕耘機にあっては、ロータリ耕耘部又はロータリカバー等のメンテナンスを行う場合、後部カバーをかなり上まで持ち上げなければならないが、後部カバーの正面側に泥土が付着していると該後部カバーを持ち上げるのにかなり大きな持上げ力を要し、重労働であると共に泥土の付着量によっては作業者一人では持ち上がらないこともある。
また、後部カバーを地面から少し浮かせた状態で耕耘作業をする場合、土の盛り上がりによって後部カバーが上昇してロックピンが前側のロック孔に係合し、該上昇した位置で後部カバーがロックされてしまうという場合がある。 In the conventional rotary cultivator, when performing maintenance on the rotary cultivator or the rotary cover, the rear cover must be lifted up considerably, but if mud is attached to the front side of the rear cover, Lifting the rear cover requires a significant lifting force, which is hard work and may not be lifted by one worker depending on the amount of mud.
Also, when plowing work with the rear cover slightly lifted from the ground, the rear cover rises due to the rising of the soil, the lock pin engages with the front lock hole, and the rear cover is locked at the raised position. It may be said that.

また、後部カバーの上下位置調整は有段の調整となり、微妙な調整が行えないという問題もある。
そこで、ロッド部材をネジ式伸縮構造によって長さ方向伸縮可能に構成すると共に該ロッド部材を伸縮することにより後部カバーの上下揺動範囲の下限位置を設定可能とすることで、後部カバーを上方に持ち上げる際の作業労力の軽減を図ると共に、後部カバーを地面から少し浮かせた状態に確実に保持でき且つ後部カバーの上下位置調整を無段で行えるようにすることが考えられている。 In addition, the vertical position adjustment of the rear cover is a stepped adjustment, and there is a problem that fine adjustment cannot be performed.
Therefore, the rod member is configured to be extendable in the length direction by a screw-type extension structure, and the lower limit position of the vertical swing range of the rear cover can be set by extending and contracting the rod member, so that the rear cover is moved upward. It has been considered to reduce work labor when lifting, to be able to hold the rear cover in a state slightly lifted from the ground and to adjust the vertical position of the rear cover steplessly.

しかしながら、後部カバーの接地部分が地面から少し浮いた状態となるように該後部カバーを保持した状態で耕耘作業をする場合、ロッド部材をネジ式伸縮構造によって伸縮自在に構成すると、後部カバーの上下揺動位置の調整（後部カバーの下限位置の調整）を行う場合、ロッド部材をどの程度収縮させたかわからないので、後部カバーの上下調整量の見当が付きにくいという問題が生じる。
本発明は、前記問題点に鑑みて、後部カバーを持ち上げる際の労力軽減を図るべく後部カバーに接地圧を付勢するカバー弾下装置のロッド部材をネジ式伸縮構造によって長さ方向伸縮自在に構成すると共に、該ロッド部材をネジ式伸縮構造によって構成したものであっても、ロッド部材の伸縮量の見当が容易に付くロータリ耕耘機を提供することを目的とする。 However, when plowing work with the rear cover held so that the grounding part of the rear cover is slightly lifted from the ground, if the rod member is configured to be extendable and retractable by a screw-type elastic structure, When adjusting the swinging position (adjusting the lower limit position of the rear cover), it is difficult to determine how much the vertical adjustment amount of the rear cover is registered because it is not known how much the rod member has been contracted.
In view of the above problems, the present invention makes it possible to extend the rod member of the cover lowering device that biases the ground pressure to the rear cover in a longitudinal direction by a screw-type elastic structure in order to reduce labor when lifting the rear cover. It is an object of the present invention to provide a rotary tiller that can easily register the amount of expansion / contraction of the rod member even if the rod member is configured by a screw-type expansion / contraction structure.

この技術的課題を解決する本発明の技術的手段は、機枠に、圃場を耕耘するロータリ耕耘部と、該ロータリ耕耘部の上方を覆う上部カバーとが設けられ、上部カバーの後端側に左右方向の軸心回りに回動自在に枢支連結された後部カバーを備え、後部カバー側と前記機枠側とにわたって後部カバーを接地方向に付勢するカバー弾下装置が設けられたロータリ耕耘機において、
カバー弾下装置は、機枠又は後部カバーの一方から他方に向けて突設された支持杆と、支持杆の長手方向に沿って配置されると共に支持杆長手方向に移動規制されかつ軸心廻り回転自在に保持されたねじ軸と、支持杆の前記機枠又は後部カバーの他方側に、支持杆長手方向に移動自在でかつ回転不能に保持されたリフトと、支持杆のリフトより機枠又は後部カバーの一方側に支持杆の長手方向に移動自在に保持されたホルダとを備え、
ねじ軸の軸心廻りの回転によりリフトが支持杆の長手方向に移動するようにリフトがねじ軸に螺合され、ホルダの支持杆長手方向への移動により後部カバーが昇降移動するように、ホルダに機枠又は後部カバーの他方が連結され、後部カバーを接地方向に付勢すべくホルダをリフト側に押圧するバネが設けられている点にある。 The technical means of the present invention for solving this technical problem is provided in the machine frame with a rotary cultivating part for cultivating a field and an upper cover covering the upper part of the rotary cultivating part, on the rear end side of the upper cover. A rotary tiller provided with a cover lowering device that includes a rear cover that is pivotally connected to be pivotable about a horizontal axis, and that urges the rear cover in the grounding direction across the rear cover side and the machine frame side. In the machine
The cover lowering device is provided with a support rod projecting from one side of the machine frame or the rear cover toward the other, and is disposed along the longitudinal direction of the support rod, and is restricted in movement in the longitudinal direction of the support rod and around the axis. A screw shaft that is rotatably held, a lift that is movable in the longitudinal direction of the support rod and non-rotatably supported on the other side of the machine frame or the rear cover of the support rod, and a frame or A holder held on one side of the rear cover so as to be movable in the longitudinal direction of the support rod;
The holder is screwed into the screw shaft so that the lift moves in the longitudinal direction of the support rod by rotation around the axis of the screw shaft, and the rear cover moves up and down by movement of the holder in the longitudinal direction of the support rod. The other of the machine frame and the rear cover is connected to the spring, and a spring is provided to press the holder toward the lift side to urge the rear cover in the grounding direction.

また、本発明の他の技術的手段は、機枠側に前取付部が設けられ、後部カバー側に後取付部が設けられ、前記支持杆は筒状に形成されると共に、支持杆の周方向の一部を開口してなる開口窓が支持杆長手方向に形成され、前取付部又は後取付部の一方に支持杆の前端側又は後端側が左右方向の回転軸心Ｓ２廻りに揺動自在に連結され、前記ねじ軸は支持杆内に軸心廻り回転自在に挿通保持され、前記リフトは、支持杆に内嵌する内嵌部と、支持杆に外嵌する外嵌部と、内嵌部と外嵌部とを支持杆の開口窓を介して連結する連結部とを有し、リフトの内嵌部と外嵌部との支持杆への嵌合によりリフトは支持杆の長手方向に移動自在に保持され、連結部の支持杆の開口窓への嵌合によりリフトは軸心廻りに回動不能に保持され、リフトの内嵌部にねじ軸が螺合するねじ孔が設けられている点にある。 According to another technical means of the present invention, a front mounting portion is provided on the machine frame side, a rear mounting portion is provided on the rear cover side, the support rod is formed in a cylindrical shape, and the periphery of the support rod is provided. An opening window having a part of the opening direction is formed in the longitudinal direction of the support rod, and the front end side or the rear end side of the support rod swings around the rotation axis S2 in the left-right direction at one of the front mounting portion or the rear mounting portion. The screw shaft is inserted and held in a support rod so as to be rotatable about its axis, and the lift has an internal fitting portion fitted into the support rod, an external fitting portion fitted into the support rod, A connecting portion that connects the fitting portion and the outer fitting portion through an opening window of the support rod, and the lift is supported in the longitudinal direction of the support rod by fitting the inner fitting portion and the outer fitting portion of the lift to the support rod. The lift is held non-rotatable around the shaft center by fitting the connecting part into the opening window of the connecting part, Flip lies in the screw hole axes are screwed are provided.

また、本発明の他の技術的手段は、前記支持杆の機枠又は後部カバーの一方側にバネ受部材が支持杆の長手方向に移動調整可能に外嵌保持され、前記ホルダは支持杆の機枠又は後部カバーの他方側に支持杆の長手方向に移動自在に外嵌され、前記バネがコイルバネにより構成されて、支持杆のバネ受部材とホルダとの間に、圧縮した状態で外嵌保持されている点にある。
また、本発明の他の技術的手段は、前記ねじ軸の後端部に、ねじ軸を回転操作するためのハンドルが設けられ、該ハンドルは支持杆の後方側であって後部カバーの上方に配置されている点にある。 According to another technical means of the present invention, a spring receiving member is fitted and held on one side of the machine frame or the rear cover of the support rod so as to be movable and adjustable in the longitudinal direction of the support rod. The other side of the machine frame or the rear cover is externally fitted so as to be movable in the longitudinal direction of the support rod, and the spring is constituted by a coil spring, and is fitted between the spring receiving member of the support rod and the holder in a compressed state. It is in a held point.
According to another technical means of the present invention, a handle for rotating the screw shaft is provided at a rear end portion of the screw shaft, and the handle is on the rear side of the support rod and above the rear cover. It is in the point where it is arranged.

本発明のロータリ耕耘機によれば、ロータリ耕耘部等をメンテナンスする場合において、ねじ軸を軸心廻りに回転することによりリフトを支持杆の長手方向に移動させて後部カバーを大きく持ち上げることができ、これにより、後部カバーを人手によって直接持ち上げなくてもよく、作業労力の軽減を図ることができる。
また、耕耘時において、後部カバーの接地部分を地面から少し浮かせた状態で耕耘する場合は、リフトを前記とは逆方向に移動させることにより、後部カバーが上方に揺動して該後部カバーの接地部分を地面から少し浮かせた状態で確実保持することができると共に、後部カバーの上下位置調整を無段で調整することができ、後部カバーの下限位置を精度良く設定することができる。 According to the rotary cultivator of the present invention, when maintaining the rotary cultivator and the like, the rear cover can be greatly lifted by rotating the screw shaft around the axis to move the lift in the longitudinal direction of the support rod. Thus, it is not necessary to lift the rear cover directly by hand, and the work labor can be reduced.
In addition, when plowing with the grounding part of the rear cover slightly lifted from the ground during plowing, the rear cover is swung upward by moving the lift in the opposite direction to the above. The grounding part can be securely held in a state of being slightly lifted from the ground, and the vertical position adjustment of the rear cover can be adjusted steplessly, and the lower limit position of the rear cover can be set with high accuracy.

しかも、カバー弾下装置は、主要部材として、支持杆と支持杆に挿通保持されたねじ軸と支持杆の長手方向に移動自在に保持されたリフトで済み、構成部材が少なくて簡単な構造になる。また、後部カバーを昇降させる場合、リフトがねじ軸及び支持杆に対して長手方向に移動するのみで、カバー弾下装置全体の長さは従来のように伸縮動作することがなくなり、カバー弾下装置全体の長さを常に短く設定することができて、カバー弾下装置をコンパクトに設置することができる。 In addition, the cover lowering device has as its main members a support rod, a screw shaft inserted and held in the support rod, and a lift held movably in the longitudinal direction of the support rod. Become. Further, when the rear cover is raised and lowered, the lift only moves in the longitudinal direction with respect to the screw shaft and the support rod, and the length of the entire cover lowering device does not expand and contract as in the conventional case. The entire length of the apparatus can be always set to be short, and the cover lowering apparatus can be installed in a compact manner.

以下、本発明の実施の形態を図面を参照して説明する。
図２において、１はトラクタ等の車輌の後部等に、三点リンク機構等を介して着脱自在且つ昇降自在に装着されて、圃場を移動しながら耕耘するロータリ耕耘機である。
このロータリ耕耘機１は、三点リンク機構に連結される機枠２と、この機枠２の下部に設けられたロータリ耕耘部３と、このロータリ耕耘部３を覆うロータリカバー４とを備えている。
機枠２は、図２，図３に示すように、左右方向中央部のギヤケース５から左右両側にサポートアーム６を突設していると共に、左右各サポートアーム６の外端側に、板材からなり且つ板厚方向を左右方向に一致させて配置したサイドフレーム７Ｌ，７Ｒを下方突出状に設け、左側のサイドフレーム７Ｌの左右方向外側面に、ロータリ耕耘部３へと動力を伝達する伝動機構を収容する伝動ケース８が取り付けられてなる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a rotary cultivator that is attached to a rear portion of a vehicle such as a tractor so as to be detachable and movable up and down via a three-point link mechanism or the like and cultivates while moving in a field.
The rotary tiller 1 includes a machine frame 2 connected to a three-point link mechanism, a rotary tiller 3 provided at a lower portion of the machine frame 2, and a rotary cover 4 that covers the rotary tiller 3. Yes.
As shown in FIGS. 2 and 3, the machine frame 2 has support arms 6 projecting from the left and right sides of the gear case 5 at the center in the left-right direction, and a plate material on the outer end side of the left and right support arms 6. The side frames 7L and 7R, which are arranged so that the plate thickness direction coincides with the left-right direction, are provided in a downward projecting shape, and the power is transmitted to the rotary tiller 3 on the left-right outer surface of the left side frame 7L. The transmission case 8 which accommodates is attached.

ロータリ耕耘部３は、左右のサイドフレーム７Ｌ，７Ｒの下部間に左右方向の軸心回りに回転自在に支持された爪軸９と、この爪軸９に左右方向にわたって取り付けられた多数の耕耘爪１０とを備えてなる。
機枠２のギヤケース５には、トラクタのＰＴＯ軸からユニバーサルジョイント等を介して該ギヤケース５内の伝動機構に動力を入力する入力軸が設けられ、この入力軸を介して入力された動力は、ギヤケース５内の伝動機構から左側のサポートアーム６内の伝動軸を介して伝動ケース８内の伝動機構に伝達されると共に、この伝動ケース８内の伝動機構から爪軸９に伝達されて、該爪軸９が軸心回りに矢示Ａ方向に回転駆動されるように構成されている。 The rotary tiller 3 includes a claw shaft 9 that is rotatably supported about the left and right axial centers between the lower portions of the left and right side frames 7L and 7R, and a plurality of tilling claws attached to the claw shaft 9 in the left and right directions. 10.
The gear case 5 of the machine frame 2 is provided with an input shaft for inputting power from the PTO shaft of the tractor to the transmission mechanism in the gear case 5 through a universal joint or the like. The power input through this input shaft is It is transmitted from the transmission mechanism in the gear case 5 to the transmission mechanism in the transmission case 8 via the transmission shaft in the left support arm 6, and is transmitted from the transmission mechanism in the transmission case 8 to the claw shaft 9, The claw shaft 9 is configured to be rotationally driven in the direction of arrow A around the axis.

ロータリカバー４は、ロータリ耕耘部３の上方を覆う上部カバー１１と、ロータリ耕耘部３の後方を覆う後部カバー１２と、ロータリ耕耘部３の後方側の左右両側を覆う左右一対の側部カバー１３とを備えてなる。
上部カバー１１は、その左右方向の端部が、左右のサイドフレーム７Ｌ，７Ｒの内側に固着された側板１４に固定されている。
後部カバー１２は、耕耘時にあっては、後方に向かうに従って下方に移行する傾斜状に配置され、その上端側（前端側）が左右側板１４間の後端側（上部カバー１１の後端側）に左右方向に配置された支軸１６を介して左右方向の軸心回りに回動自在に支持されていて上下揺動自在とされており、該後部カバー１２はロータリ耕耘部３から後方に放てきされた耕耘土を受けると共に下端側（後端側）が圃場に接地して該圃場を整地する。 The rotary cover 4 includes an upper cover 11 that covers the top of the rotary tiller 3, a rear cover 12 that covers the rear of the rotary tiller 3, and a pair of left and right side covers 13 that covers both the left and right sides of the rotary tiller 3. And comprising.
The upper cover 11 has an end portion in the left-right direction fixed to a side plate 14 fixed inside the left and right side frames 7L and 7R.
When plowing, the rear cover 12 is disposed in an inclined shape that moves downward as it goes rearward, and its upper end side (front end side) is the rear end side between the left and right side plates 14 (rear end side of the upper cover 11). The rear cover 12 is supported from the rotary tiller 3 to the rear by being pivotally supported by a pivot 16 disposed in the left-right direction. While receiving the cultivated soil, the lower end side (rear end side) comes into contact with the field to level the field.

なお、後部カバー１２として、下端側に整地部材を着脱自在に備えたタイプのものが採用されていてもよい。
左右の側部カバー１３は、左右方向で同じ側にあるサイドフレーム７Ｌ，７Ｒに固定されている。
また、ロータリ耕耘機１にあっては、後部カバー１２を下方側に付勢する（接地方向に付勢する）左右一対のカバー弾下装置１９Ａ，１９Ｂが、機枠２側に設けられた前取付部１７と、後部カバー１２の背面に設けられた後取付部１８とにわたって設けられている。 In addition, as the rear cover 12, a type in which a leveling member is detachably attached to the lower end side may be employed.
The left and right side covers 13 are fixed to the side frames 7L and 7R on the same side in the left-right direction.
Further, in the rotary cultivator 1, a pair of left and right cover lowering devices 19A, 19B that urge the rear cover 12 downward (bias in the grounding direction) are provided on the machine frame 2 side. The mounting portion 17 is provided over the rear mounting portion 18 provided on the back surface of the rear cover 12.

前取付部１７は、ギヤケース５の左右両側に配置されていてそれぞれサポートアーム６に固着されており、本実施の形態では、左右方向に間隔をおいて配置された左右一対の板材１７ａから構成されている。
なお、前取付部１７は機枠２側に設けられていればよく、例えば、上部カバー１１の上面側に設けられていてもよい。
左右各前取付部１７の後方側にはそれぞれ補強部材２０が設けられ、該左右各補強部材２０は板材から形成されていて後部カバー１２の背面に固着されており、左右方向に間隔をおいて配置された左右の側壁２１と、左右の側壁２１を連結する連結壁２２とを備えてなる。 The front mounting portions 17 are disposed on both the left and right sides of the gear case 5 and are respectively fixed to the support arms 6. In the present embodiment, the front mounting portions 17 are composed of a pair of left and right plate members 17a disposed at intervals in the left-right direction. ing.
In addition, the front attachment part 17 should just be provided in the machine frame 2 side, for example, may be provided in the upper surface side of the upper cover 11. FIG.
Reinforcing members 20 are respectively provided on the rear sides of the left and right front mounting portions 17, and each of the left and right reinforcing members 20 is formed of a plate material and is fixed to the back surface of the rear cover 12, and is spaced apart in the left-right direction. The left and right side walls 21 are arranged, and a connecting wall 22 that connects the left and right side walls 21 is provided.

この補強部材２０の左右の側壁２１の上部側（前部側）は、後部カバー１２から背面側に向けて突出するように形成され、この補強部材２０の左右側壁２１の上部側が後取付部１８とされている。
左右の各カバー弾下装置１９Ａ，１９Ｂは、図１、図２、図４〜図６に示すように、左右方向で同じ側にある前取付部１７と後取付部１８とにわたって設けられている。
図１及び図４に示すように、一方のカバー弾下装置１９Ａは、機枠２から後部カバー１２に向けて突設された支持杆２５Ａと、支持杆２５Ａの長手方向に沿って配置されると共に軸心廻り回転自在に保持されたねじ軸２６と、支持杆２５Ａの後部カバー１２側に、支持杆２５Ａ長手方向に移動自在でかつ回転不能に保持されたリフト２７と、支持杆２５Ａのリフト２７より前側（機枠２側）に支持杆２５Ａ長手方向に移動自在に保持されたホルダ２８Ａとを備える。 The upper side (front side) of the left and right side walls 21 of the reinforcing member 20 is formed so as to protrude from the rear cover 12 toward the back side, and the upper side of the left and right side walls 21 of the reinforcing member 20 is the rear mounting portion 18. It is said that.
As shown in FIGS. 1, 2, and 4 to 6, the left and right cover lowering devices 19 A and 19 B are provided across the front mounting portion 17 and the rear mounting portion 18 on the same side in the left-right direction. .
As shown in FIGS. 1 and 4, one cover lowering device 19 A is disposed along a support rod 25 A projecting from the machine frame 2 toward the rear cover 12 and along the longitudinal direction of the support rod 25 A. In addition, the screw shaft 26 that is rotatably held around the shaft center, the lift 27 that is movable in the longitudinal direction of the support rod 25A and non-rotatably supported on the rear cover 12 side of the support rod 25A, and the lift of the support rod 25A 27 is provided on the front side (machine frame 2 side) 27 with a holder 28A held movably in the longitudinal direction of the support rod 25A.

前記支持杆２５Ａは円筒状に形成され、支持杆２５Ａの周方向の一部を開口してなる支持杆２５Ａ長手方向の開口窓３１が支持杆２５Ａの後部側に設けられている。支持杆２５Ａの前端側が、取付体３３と支持軸３４とを介して、前取付部１７に左右方向の回転軸心Ｓ２廻りに揺動自在に連結されている。
取付体３３は円筒状に形成され、前側の小筒部３７と後側の小筒部３８とを有し、小筒部３７に軸方向に前大径孔３９と中間小径孔と後大径孔４１とが形成され、左右方向に嵌合孔４２が中間小径孔に直交するように貫通形成されている。取付体３３の小筒部３７が一方の前取付部１７を構成する左右の板材１７ａ間に配置されている。 The support rod 25A is formed in a cylindrical shape, and an opening window 31 in the longitudinal direction of the support rod 25A formed by opening a part of the circumferential direction of the support rod 25A is provided on the rear side of the support rod 25A. The front end side of the support rod 25A is connected to the front mounting portion 17 through the mounting body 33 and the support shaft 34 so as to be swingable about the rotation axis S2 in the left-right direction.
The attachment body 33 is formed in a cylindrical shape, and has a front small tube portion 37 and a rear small tube portion 38, and the small tube portion 37 has a front large diameter hole 39, an intermediate small diameter hole, and a rear large diameter in the axial direction. A hole 41 is formed, and a fitting hole 42 is formed in the left-right direction so as to be orthogonal to the intermediate small-diameter hole. A small cylindrical portion 37 of the mounting body 33 is disposed between the left and right plate members 17 a constituting one front mounting portion 17.

支持軸３４は、一方の前取付部１７を構成する左右の板材１７ａにわたって配置されており、支持軸３４の内端部中央に軸方向の挿通孔４５が設けられている。支持軸３４の左右端部側が該一方の前取付部１７の左右の板材１７ａに形成された支持孔３５に挿通され、支持軸３４の左右方向中央部は、取付体３３に嵌合孔４２を介して嵌合され、これにより、取付体３３は支持軸３４を介して前取付部１７に回動軸心Ｓ２回りに回動自在に支持されている。
支持杆２５Ａは、その前端側が前記取付体３３の大筒部３８に内嵌されてスプリングピン４６により抜け止めされて、取付体３３の後部に固着されている。 The support shaft 34 is arranged over the left and right plate members 17 a constituting one front mounting portion 17, and an axial insertion hole 45 is provided at the center of the inner end portion of the support shaft 34. The left and right end portions of the support shaft 34 are inserted into support holes 35 formed in the left and right plate members 17 a of the one front mounting portion 17, and the center portion in the left and right direction of the support shaft 34 has a fitting hole 42 in the mounting body 33. Accordingly, the attachment body 33 is supported by the front attachment portion 17 via the support shaft 34 so as to be rotatable around the rotation axis S2.
The front end of the support rod 25A is fitted into the large cylinder portion 38 of the mounting body 33 and is prevented from being detached by the spring pin 46, and is fixed to the rear portion of the mounting body 33.

前記構成によって、支持杆２５Ａの前端側が前取付部１７に、回動軸心Ｓ２廻りに揺動自在で支持杆２５Ａの軸方向に移動不能に支持されている。
ねじ軸２６の軸方向前部側は外面円滑状に形成され、ねじ軸２６の軸方向中途部から後端部にかけて外周面に雄ねじ部４８が形成されている。ねじ軸２６は支持杆２５Ａ内に軸心廻り回転自在に挿通保持されている。ねじ軸２６の前部側は、前大径孔３９、中間小径孔及び後大径孔４１を介して取付体３３に軸方向に挿通されると共に、支持軸３４に挿通孔４５を介して軸方向に挿通され、ねじ軸２６の前端部は取付体３３の前側に突出されている。ねじ軸２６の前端部に、軸受４０とハンドル４３のボス４４とが順に外嵌され、軸受４０は取付体３３の前大径孔３９に嵌合保持されている。ハンドル４３のボス４４がねじ軸２６にピンによって固定されることで、ねじ軸２６が取付体３３から後側への抜止めがなされ、ねじ軸２６には、取付体３３の後大径孔４１の前開口縁に接当するスプリングピン４９が挿通されて、ねじ軸２６は取付体３３に対して前側への抜け止めがなされている。 With this configuration, the front end side of the support rod 25A is supported by the front mounting portion 17 so as to be swingable about the rotation axis S2 and immovable in the axial direction of the support rod 25A.
The front side of the screw shaft 26 in the axial direction is formed to have a smooth outer surface, and a male screw portion 48 is formed on the outer peripheral surface from the midway portion of the screw shaft 26 in the axial direction to the rear end portion. The screw shaft 26 is inserted and held in the support rod 25A so as to be rotatable about its axis. The front side of the screw shaft 26 is inserted through the attachment body 33 in the axial direction through the front large-diameter hole 39, the intermediate small-diameter hole, and the rear large-diameter hole 41, and the shaft is inserted into the support shaft 34 through the insertion hole 45. The front end of the screw shaft 26 protrudes to the front side of the mounting body 33. The bearing 40 and the boss 44 of the handle 43 are sequentially fitted on the front end portion of the screw shaft 26, and the bearing 40 is fitted and held in the front large-diameter hole 39 of the mounting body 33. By fixing the boss 44 of the handle 43 to the screw shaft 26 with a pin, the screw shaft 26 is prevented from being pulled out from the mounting body 33 to the rear side, and the screw shaft 26 has a rear large-diameter hole 41 in the mounting body 33. A spring pin 49 that is in contact with the front opening edge is inserted, and the screw shaft 26 is prevented from coming off to the front side with respect to the mounting body 33.

これによって、ねじ軸２６は、支持杆２５Ａに対して、支持杆２５Ａ長手方向に移動規制されかつ軸心廻り回転自在に保持されており、ねじ軸２６は、軸心廻りに回動自在で、かつ支持杆２５Ａと回動軸心Ｓ２廻りに一体揺動自在で、かつ軸方向に移動不能に支持されている。
リフト２７は、図５にも示すように、支持杆２５Ａに内嵌する内嵌部５１と、支持杆２５Ａに外嵌する外嵌部５２と、内嵌部５１と外嵌部５２とを支持杆２５Ａの開口窓３１を介して連結する連結部５３とを有している。リフト２７の内嵌部５１と外嵌部５２との支持杆２５Ａへの嵌合によりリフト２７は支持杆２５Ａの長手方向に移動自在に保持され、連結部５３の支持杆２５Ａの開口窓３１への嵌合によりリフト２７は軸心廻りに回動不能に保持され、リフト２７の内嵌部５１にねじ軸２６が螺合するねじ孔５４が設けられている。リフト２７はねじ軸２６に螺合されて、ねじ軸２６の軸心廻りの回転によりリフト２７が支持杆２５Ａの長手方向に移動するように構成されている。ねじ軸２６の後端部のリフト２７の後側に、スプリングピン５５が挿通保持され、スプリングピン５５によりリフト２７を支持杆２５Ａ及びねじ軸２６の後端から抜けないように抜け止めしている。 As a result, the screw shaft 26 is restrained from moving in the longitudinal direction of the support rod 25A with respect to the support rod 25A and is rotatably held around the axis, and the screw shaft 26 is rotatable around the axis. In addition, it is supported so as to be swingable integrally around the support rod 25A and the rotation axis S2, but not movable in the axial direction.
As shown in FIG. 5, the lift 27 supports the inner fitting portion 51 fitted into the support rod 25 A, the outer fitting portion 52 fitted outside the support rod 25 A, and the inner fitting portion 51 and the outer fitting portion 52. It has the connection part 53 connected via the opening window 31 of the collar 25A. The lift 27 is held movably in the longitudinal direction of the support rod 25A by fitting the inner fitting portion 51 and the outer fitting portion 52 of the lift 27 to the support rod 25A, and to the opening window 31 of the support rod 25A of the connecting portion 53. The lift 27 is held so as to be unrotatable around the shaft center by the fitting, and a screw hole 54 into which the screw shaft 26 is screwed is provided in the inner fitting portion 51 of the lift 27. The lift 27 is screwed to the screw shaft 26, and the lift 27 is moved in the longitudinal direction of the support rod 25A by the rotation of the screw shaft 26 around the axis. A spring pin 55 is inserted and held behind the lift 27 at the rear end of the screw shaft 26, and the spring pin 55 prevents the lift 27 from coming off from the support rod 25A and the rear end of the screw shaft 26. .

ホルダ２８Ａは支持杆２５Ａの後部カバー１２側に支持杆２５Ａの長手方向に移動自在に外嵌されている。ホルダ２８Ａは、左右方向外方に突出した左右一対の円筒状の支持軸５６を介して後取付部１８に左右方向の回動軸心Ｓ１廻りに回動自在に支持され、これによりホルダ２８Ａの支持杆２５Ａ長手方向への移動により後部カバー１２が昇降移動するように、ホルダ２８Ａに後部カバー１２が連結されている。
後部カバー１２を接地方向に付勢すべくホルダ２８Ａをリフト２７側に押圧するバネ２９Ａが設けられている。前記バネ２９Ａはコイルバネにより構成されて、支持杆２５Ａのホルダ２８Ａと後述するバネ受部材５７Ａとの間に、圧縮した状態で外嵌保持されている。 The holder 28A is externally fitted to the rear cover 12 side of the support rod 25A so as to be movable in the longitudinal direction of the support rod 25A. The holder 28A is supported by the rear mounting portion 18 via a pair of left and right cylindrical support shafts 56 projecting outward in the left-right direction so as to be rotatable about the rotation axis S1 in the left-right direction. The rear cover 12 is connected to the holder 28A so that the rear cover 12 moves up and down by movement in the longitudinal direction of the support rod 25A.
A spring 29A is provided to press the holder 28A toward the lift 27 in order to bias the rear cover 12 in the grounding direction. The spring 29A is constituted by a coil spring, and is externally held in a compressed state between a holder 28A of the support rod 25A and a spring receiving member 57A described later.

支持杆２５Ａの機枠２側（前部側）に、バネ２９Ａの前側端部の位置規制をするバネ受部材５７Ａが支持杆２５Ａの長手方向に移動調整可能に外嵌保持されている。バネ受部材５７Ａは、バネ２９Ａの前側に配置されていて、図７に示すように、支持杆２５Ａに軸方向移動可能に外嵌された本体６１と、支持杆２５Ａの上面側に形成された係合溝６２に係合して本体６１の支持杆２５Ａ長手方向の移動を規制するキー部材６３と、このキー部材６３を係合溝６２に係合する方向に付勢するバネ６４とを有する。係合溝６２は支持杆２５Ａの軸方向に間隔をおいて複数形成されている。 On the machine casing 2 side (front side) of the support rod 25A, a spring receiving member 57A for regulating the position of the front end of the spring 29A is externally held so as to be movable and adjustable in the longitudinal direction of the support rod 25A. The spring receiving member 57A is disposed on the front side of the spring 29A and, as shown in FIG. 7, is formed on the main body 61 that is externally fitted to the support rod 25A so as to be movable in the axial direction, and on the upper surface side of the support rod 25A. A key member 63 that engages with the engagement groove 62 to restrict the longitudinal movement of the support rod 25A of the main body 61 and a spring 64 that biases the key member 63 in a direction to engage with the engagement groove 62 are provided. . A plurality of engaging grooves 62 are formed at intervals in the axial direction of the support rod 25A.

本体６１には、支持杆２５Ａを挿通させるための挿通孔６５と、キー部材６３を収容するキー収容部６６と、バネ６４を収容するバネ収容部６７とが形成されている。
キー収容部６６及びバネ収容部６７は、キー部材６３及びバネ６４を下方側から挿入すべく下端開放状に形成されている。
前記構成のバネ受部材５７Ａにあっては、本体６１を支持杆２５Ａの軸心廻りに回動させることによりキー部材６３が本体６１と一体回動し、バネ６４の付勢力に抗して支持杆２５Ａの径外方向に移動して係合溝６２が形成されていない部分に乗り上げることにより係合溝６２から離脱し、バネ受部材５７Ａの支持杆２５Ａ長手方向の移動が可能となるように構成されている。 The main body 61 is formed with an insertion hole 65 for inserting the support rod 25 A, a key accommodating portion 66 for accommodating the key member 63, and a spring accommodating portion 67 for accommodating the spring 64.
The key accommodating part 66 and the spring accommodating part 67 are formed in an open shape at the lower end so that the key member 63 and the spring 64 can be inserted from below.
In the spring receiving member 57A configured as described above, the key member 63 rotates integrally with the main body 61 by rotating the main body 61 about the axis of the support rod 25A, and supports the spring 64 against the urging force of the spring 64. The collar 25A moves outward in the radial direction and rides on the portion where the engagement groove 62 is not formed, so that it can be detached from the engagement groove 62, and the spring bearing member 57A can be moved in the longitudinal direction of the support collar 25A. It is configured.

図６に示すように、他方のカバー弾下装置１９Ｂは、機枠２から後部カバー１２に向けて突設された支持杆２５Ｂと、支持杆２５Ｂの後部カバー１２側端部に、外嵌固着された止め環７１と、支持杆２５Ｂの止め環７１より機枠２側に支持杆２５Ｂ長手方向に移動自在に保持されたホルダ２８Ｂとを備える。
ホルダ２８Ｂは、支持軸５６を介して後取付部１８に左右方向の回動軸心Ｓ１廻りに回動自在に支持され、これにより後部カバー１２の昇降移動によりホルダ２８Ｂが支持杆２５Ｂ長手方向に移動するように、ホルダ２８Ｂと後部カバー１２とが連結されている。後部カバー１２を接地方向に付勢すべくホルダ２８Ｂを止め環７１側に押圧するバネ２９Ｂが設けられている。 As shown in FIG. 6, the other cover lowering device 19B is fixedly fitted to the support cover 25B projecting from the machine frame 2 toward the rear cover 12, and to the rear cover 12 side end of the support cover 25B. And a holder 28B held movably in the longitudinal direction of the support rod 25B on the machine frame 2 side from the stop ring 71 of the support rod 25B.
The holder 28B is supported by the rear mounting portion 18 via the support shaft 56 so as to be rotatable around the rotation axis S1 in the left-right direction. As a result, the holder 28B is moved in the longitudinal direction of the support rod 25B by the up-and-down movement of the rear cover 12. The holder 28B and the rear cover 12 are connected so as to move. A spring 29B is provided to press the holder 28B toward the stop ring 71 in order to urge the rear cover 12 in the grounding direction.

前記支持杆２５Ｂは円筒状に形成され、支持杆２５Ｂの軸方向に間隔をおいて係合溝６２が複数形成されている。支持杆２５Ｂの前端側が、取付ピン７２により、前取付部１７に左右方向の回転軸心Ｓ２廻りに揺動自在に連結されている。
取付ピン７２は前取付部１７の左右の板材１７ａ及び支持杆２５Ｂの前端部に挿通され、スナップピン７３により抜け止めされている。支持杆２５Ｂの前取付部１７の後側に止め環７５が外嵌固着されている。
ホルダ２８Ｂは支持杆２５Ｂの後部カバー１２側に支持杆２５Ｂの長手方向に移動自在に外嵌され、バネ２９Ｂがコイルバネにより構成されて、支持杆２５Ｂのホルダ２８Ｂとバネ受部材５７Ｂとの間に、圧縮した状態で外嵌保持されている。 The support rod 25B is formed in a cylindrical shape, and a plurality of engagement grooves 62 are formed at intervals in the axial direction of the support rod 25B. The front end side of the support rod 25B is connected to the front mounting portion 17 by a mounting pin 72 so as to be swingable about the rotation axis S2 in the left-right direction.
The mounting pin 72 is inserted into the left and right plate members 17a of the front mounting portion 17 and the front end portion of the support rod 25B, and is prevented from coming off by a snap pin 73. A retaining ring 75 is fitted and fixed to the rear side of the front mounting portion 17 of the support rod 25B.
The holder 28B is externally fitted on the rear cover 12 side of the support rod 25B so as to be movable in the longitudinal direction of the support rod 25B, and a spring 29B is constituted by a coil spring, between the holder 28B of the support rod 25B and the spring receiving member 57B. The outer fit is held in a compressed state.

支持杆２５Ｂの機枠２側（前部側）に、バネ２９Ｂの前側端部の位置規制をするバネ受部材５７Ｂが支持杆２５Ｂの長手方向に移動調整可能に外嵌保持されている。バネ受部材５７Ｂは、バネ２９Ｂの前側に配置されていて、前記一方のカバー弾下装置１９Ａのバネ受部材５７Ａと同様に構成され、本体６１とキー部材６３とバネ６４とを有し、本体６１を支持杆２５Ｂの軸心廻りに回動させることによりキー部材６３が本体６１と一体回動し、バネ６４の付勢力に抗して支持杆２５Ｂの径外方向に移動して係合溝６２が形成されていない部分に乗り上げることにより係合溝６２から離脱し、バネ受部材５７Ｂの支持杆２５Ｂ長手方向の移動が可能となるように構成されている（図７参照）。 On the machine casing 2 side (front side) of the support rod 25B, a spring receiving member 57B for regulating the position of the front end of the spring 29B is externally held so as to be movable and adjustable in the longitudinal direction of the support rod 25B. The spring receiving member 57B is disposed on the front side of the spring 29B, is configured in the same manner as the spring receiving member 57A of the one cover lowering device 19A, and includes a main body 61, a key member 63, and a spring 64. By rotating 61 around the axis of the support rod 25B, the key member 63 rotates integrally with the main body 61 and moves outward in the radial direction of the support rod 25B against the biasing force of the spring 64. By climbing over a portion where 62 is not formed, the engagement groove 62 is disengaged, and the spring receiving member 57B can be moved in the longitudinal direction of the support rod 25B (see FIG. 7).

上記の実施形態によれば、一方のカバー弾下装置１９Ａのハンドル４３によりねじ軸２６を軸心廻りに回転して、リフト２７を支持杆２５Ａの後方に移動させた状態から支持杆２５Ａの前側に移動させると、ホルダ２８Ａがリフト２７により前側に押圧され、これにより、図２に示すように、後部カバー１２が下方に垂れ下がった状態から支軸１６廻りに上方に揺動する。
また、ハンドル４３によりねじ軸２６を軸心廻りに回転して、リフト２７を支持杆２５Ａの後方に移動させると前記とは逆に後部カバー１２は自重で下方に揺動する。 According to the above-described embodiment, the screw shaft 26 is rotated around the axis by the handle 43 of the one cover lowering device 19A, and the lift 27 is moved to the rear of the support rod 25A. As shown in FIG. 2, the holder 28A is pushed forward by the lift 27, and as a result, the rear cover 12 swings upward around the support shaft 16 from the state where it hangs downward.
On the other hand, when the screw shaft 26 is rotated around the shaft center by the handle 43 and the lift 27 is moved to the rear of the support rod 25A, the rear cover 12 swings downward by its own weight.

通常耕耘する場合は、一方のカバー弾下装置１９Ａのリフト２７を支持杆２５Ａの後端部に移動させた状態とする。
この通常耕耘時にあっては、後部カバー１２は、その下端側の接地部分が地面に接当することにより後方に行くに従って下方に移行する前傾状の姿勢となると共に、バネ２９Ａ，２９Ｂはバネ受部材５７Ａ，５７Ｂとホルダ２８Ａ，２８Ｂとの間で圧縮状とされて後部カバー１２を接地方向に付勢している。
このとき、バネ受部材５７Ａ，５７Ｂを支持杆２５Ａ，２５Ｂ長手方向に移動させてキー部材６３を他の係合溝６２に係合させることにより、後部カバー１２に対する付勢力を変更することができる。 In the case of normal tilling, the lift 27 of one cover lowering device 19A is moved to the rear end of the support rod 25A.
At the time of this normal tillage, the rear cover 12 has a forward inclined posture in which the rear cover 12 is moved downward as the ground contact portion on the lower end side comes into contact with the ground, and the springs 29A and 29B are springs. It is compressed between the receiving members 57A and 57B and the holders 28A and 28B to urge the rear cover 12 in the grounding direction.
At this time, the urging force with respect to the rear cover 12 can be changed by moving the spring receiving members 57A, 57B in the longitudinal direction of the support rods 25A, 25B and engaging the key member 63 with the other engaging groove 62. .

また、通常耕耘状態では、ホルダ２８Ａ，２８Ｂが一方のカバー弾下装置１９Ａの支持杆２５Ａに対して長手方向に移動可能であるので、後部カバー１２は耕耘深さに応じて上下に揺動可能である。
また、後部カバー１２の接地部分を地面から浮かせた状態で耕耘する場合は、後部カバー１２の接地部分が地面から浮く状態になるまで一方のカバー弾下装置１９Ａのリフト２７を前側に移動させて後部カバー１２の上下揺動範囲の下限位置を所望の位置に設定する。 In the normal tillage state, the holders 28A and 28B can move in the longitudinal direction with respect to the support rod 25A of the one cover lowering device 19A, so that the rear cover 12 can swing up and down according to the tilling depth. It is.
Further, when plowing with the grounding portion of the rear cover 12 floating from the ground, the lift 27 of one cover lowering device 19A is moved forward until the grounding portion of the rear cover 12 floats from the ground. The lower limit position of the vertical swing range of the rear cover 12 is set to a desired position.

また、一方のカバー弾下装置１９Ａは、ねじ軸２６とリフト２７との螺合によって後部カバー１２が昇降調整される構造であるので、後部カバー１２の上下揺動位置の調整は無段で調整が行え、後部カバー１２を任意の位置で保持できると共に後部カバー１２の上下揺動位置を作業時の条件に応じて精度良く調整することができる。
また、メンテナンス時においては、一方のカバー弾下装置１９Ａのリフト２７を前側に移動させる。
前記実施の形態にあっては、後部カバー１２の接地部分を地面から少し浮かせた状態での耕耘時、メンテナンス時における後部カバー１２の上下揺動位置の調整は、すべてねじ軸２６を回動させるだけで行えるので、操作が簡単であり説明書がなくても使用できると共に、従来のように作業者が人手で後部カバー１２を持ち上げる必要もないため作業労力の軽減を図ることができる。 In addition, since the cover lowering device 19A has a structure in which the rear cover 12 is adjusted up and down by screwing the screw shaft 26 and the lift 27, the vertical swing position of the rear cover 12 is adjusted steplessly. The rear cover 12 can be held at an arbitrary position, and the vertical swing position of the rear cover 12 can be adjusted with high accuracy according to the working conditions.
Further, during maintenance, the lift 27 of one cover lowering device 19A is moved to the front side.
In the above-described embodiment, the adjustment of the vertical swing position of the rear cover 12 at the time of plowing and maintenance while the grounding portion of the rear cover 12 is slightly lifted from the ground is all made to rotate the screw shaft 26. Therefore, it is easy to operate and can be used without instructions, and it is not necessary for the operator to manually lift the rear cover 12 as in the prior art, so that the work labor can be reduced.

また、従来のカバー弾下装置にあっては、ホルダにロックピンやバネ部材を組み込んでいるので構造が複雑であり、また、ロッド部材にロック孔を形成しなければならないが、本実施の形態にあっては、このような問題はなく、従来のカバー弾下装置に比べて構造の簡素化も図ることができる。
また、上記実施の形態によれば、特願２００６−００６２１８号及び特願２００６−１３８１９４号に開示されるように、外筒体と、外筒体に対して出退移動する内筒体と、外筒体に回転自在に挿通保持されて、内筒体に固定のナット体に螺合するねじ軸とを備え、ねじ軸をハンドルにより回動操作することにより、外筒体に対して内筒体を出退移動して伸縮させるようにしたねじ式伸縮構造のものと比べても、本願発明のカバー弾下装置は、主要部材として、支持杆１９Ａ，１９Ｂと、支持杆２５Ａ，２５Ｂに挿通保持されたねじ軸２６と、支持杆１９Ａ，１９Ｂの長手方向に移動自在に保持されたリフト２７等で済み、構成部材が少なくて簡単な構造になり、しかも、リフト２７がねじ軸２６及び支持杆１９Ａ，１９Ｂに対して長手方向に移動するのみで、カバー弾下装置１９Ａ，１９Ｂ全体の長さは従来のように伸縮動作することがなくなり、ロータリ耕耘機１の本体に対してカバー弾下装置１９Ａ，１９Ｂを簡単かつコンパクトに設置することができる。 Further, in the conventional cover de-balling device, since the lock pin and the spring member are incorporated in the holder, the structure is complicated, and the lock hole must be formed in the rod member. In this case, there is no such problem, and the structure can be simplified as compared with the conventional cover bouncing device.
Further, according to the above embodiment, as disclosed in Japanese Patent Application No. 2006-006218 and Japanese Patent Application No. 2006-138194, an outer cylinder body, an inner cylinder body that moves in and out of the outer cylinder body, A screw shaft that is rotatably inserted into and held by the outer cylinder body and is screwed into a nut body fixed to the inner cylinder body, and the screw cylinder is rotated by a handle so that the inner cylinder can be moved relative to the outer cylinder body. Compared with a screw-type telescopic structure in which the body is moved back and forth to expand and contract, the cover lowering device of the present invention is inserted into the support rods 19A and 19B and the support rods 25A and 25B as main members. The held screw shaft 26 and the lift 27 held so as to be movable in the longitudinal direction of the support rods 19A and 19B suffice, and the structure becomes simple with few components, and the lift 27 is supported by the screw shaft 26 and the support rod. Longitudinal direction with respect to ridges 19A and 19B By simply moving, the entire length of the cover lowering devices 19A and 19B does not expand and contract as in the prior art, and the cover lowering devices 19A and 19B are simply and compactly installed on the main body of the rotary tiller 1. can do.

なお、前述したロータリ耕耘機１にあっては、ロータリ耕耘機１に通常装備される部材、機構等の主要部を開示しており、その他の本発明とは関係のない通常装備される部材、機構等は省略している。
図８及び図９は他の実施形態を示し、カバー弾下装置１９Ａ，１９Ｂが、前記図１〜図７の実施形態に対して、前後逆になるように、前取付部１７と後取付部１８とにわたって設けられている。
即ち、図８に示すように、カバー弾下装置１９Ａの支持杆２５Ａは、後部カバー１２から機枠２に向けて突設され、リフト２７は、支持杆２５Ａの機枠２側に、支持杆２５Ａ長手方向に移動自在でかつ回転不能に保持されている。ホルダ２８Ａは、支持杆２５Ａのリフト２７より後側（後部カバー１２側）に支持杆２５Ａ長手方向に移動自在に保持されている。 In the rotary cultivator 1 described above, the main parts such as members and mechanisms that are normally equipped on the rotary cultivator 1 are disclosed, and other members that are normally equipped that are not related to the present invention, The mechanism and the like are omitted.
8 and 9 show another embodiment, and the front mounting portion 17 and the rear mounting portion are arranged so that the cover lowering devices 19A and 19B are reversed in the front-rear direction with respect to the embodiment shown in FIGS. 18 are provided.
That is, as shown in FIG. 8, the support rod 25A of the cover lowering device 19A protrudes from the rear cover 12 toward the machine frame 2, and the lift 27 is located on the side of the machine frame 2 of the support rod 25A. 25A is movable in the longitudinal direction and is held non-rotatable. The holder 28A is held movably in the longitudinal direction of the support rod 25A on the rear side (rear cover 12 side) of the lift 27 of the support rod 25A.

そして、支持杆２５Ａの後端側が、取付体３３と支持軸３４とを介して、後取付部１８に左右方向の回転軸心Ｓ２廻りに揺動自在に連結され、ホルダ２８Ａの支持杆２５Ａ長手方向への移動により後部カバー１２が昇降移動するように、取付体３３に後部カバー１２が連結され、バネ２９Ａでホルダ２８Ａを前側（リフト２７側）に押圧して、後部カバー１２を接地方向に付勢するようにしている。ハンドル４３はボス部４４を介してねじ軸２６（カバー弾下装置１９Ａ）の後端部に設けられ、ロータリ耕耘機１の後側からハンドル４３を回動操作することにより、ねじ軸２６を軸心廻りに回転させて、リフト２７に対して、ねじ軸２６及び支持杆２５Ａが長手方向に移動し、これにより後部カバー１２が昇降移動するようになっている。従って、ハンドル４３は支持杆２５Ａの後方側であって後部カバー１２の上方に配置されている。 The rear end side of the support rod 25A is connected to the rear attachment portion 18 via the attachment body 33 and the support shaft 34 so as to be swingable about the rotation axis S2 in the left-right direction. The rear cover 12 is connected to the mounting body 33 so that the rear cover 12 moves up and down by the movement in the direction, and the holder 28A is pressed to the front side (lift 27 side) by the spring 29A to bring the rear cover 12 into the grounding direction. It is trying to be energized. The handle 43 is provided at the rear end portion of the screw shaft 26 (the cover lowering device 19A) via the boss portion 44, and the screw shaft 26 is pivoted by rotating the handle 43 from the rear side of the rotary cultivator 1. The screw shaft 26 and the support rod 25A are moved in the longitudinal direction with respect to the lift 27 by rotating around the center, whereby the rear cover 12 is moved up and down. Therefore, the handle 43 is disposed on the rear side of the support rod 25A and above the rear cover 12.

また、図９に示すように、他方のカバー弾下装置１９Ｂの支持杆２５Ｂは、後部カバー１２から機枠２に向けて突設され、止め環７１は、支持杆２５Ｂの機枠２側端部（前端部）に外嵌固着され、ホルダ２８Ｂは、支持杆２５Ｂの止め環７１よりも前側（後部カバー１２側）に支持杆２５Ｂ長手方向に移動自在に保持されている。
ホルダ２８Ｂは支持杆２５Ｂの機枠２側に支持杆２５Ｂの長手方向に移動自在に外嵌され、ホルダ２８Ｂは支持軸５６を介して前取付部１７に左右方向の回動軸心Ｓ１廻りに回動自在に支持され、これにより後部カバー１２の昇降移動により支持杆２５Ｂがホルダ２８Ｂに対して長手方向に移動するように、ホルダ２８Ｂと機枠２とが連結されている。 Further, as shown in FIG. 9, the support rod 25B of the other cover lowering device 19B protrudes from the rear cover 12 toward the machine frame 2, and the retaining ring 71 is the end of the support rod 25B on the machine frame 2 side. The holder 28B is held on the front side (rear cover 12 side) of the support collar 25B so as to be movable in the longitudinal direction of the support collar 25B.
The holder 28B is externally fitted on the side of the frame 2 of the support rod 25B so as to be movable in the longitudinal direction of the support rod 25B. The holder 28B is attached to the front mounting portion 17 via the support shaft 56 around the rotation axis S1 in the left-right direction. The holder 28B and the machine casing 2 are connected so that the support rod 25B is moved in the longitudinal direction with respect to the holder 28B by the up-and-down movement of the rear cover 12.

支持杆２５Ｂの後部カバー１２側（後部側）に、バネ受部材５７Ｂが支持杆２５Ｂの長手方向に移動調整可能に外嵌保持され、後部カバー１２を接地方向に付勢すべくホルダ２８Ｂを前側（止め環７１側）に押圧するバネ２９Ｂが、ホルダ２８Ｂとバネ受部材５７Ｂとの間に設けられている。
支持杆２５Ｂの後端側が、取付ピン７２により、後取付部１８に左右方向の回転軸心Ｓ２廻りに揺動自在に連結されている。取付ピン７２は後取付部１８の左右の板材１８ａ及び支持杆２５Ｂの後端部に挿通され、スナップピン７３により抜け止めされている。支持杆２５Ｂの後取付部１８の後側に止め環７５が外嵌固着されている。 On the rear cover 12 side (rear side) of the support rod 25B, the spring receiving member 57B is fitted and held so as to be movable and adjustable in the longitudinal direction of the support rod 25B, and the holder 28B is moved to the front side to urge the rear cover 12 in the grounding direction. A spring 29B that presses toward the retaining ring 71 is provided between the holder 28B and the spring receiving member 57B.
The rear end side of the support rod 25B is connected to the rear mounting portion 18 by a mounting pin 72 so as to be swingable about the rotation axis S2 in the left-right direction. The attachment pin 72 is inserted into the left and right plate members 18 a of the rear attachment portion 18 and the rear end portion of the support rod 25 B, and is prevented from being detached by a snap pin 73. A retaining ring 75 is fitted and fixed to the rear side of the rear mounting portion 18 of the support rod 25B.

その他の点は前記実施の形態の場合と同様の構成である。
上記実施の形態によれば、前記図１〜図７の実施の形態の場合と同様に、ロータリ耕耘部３等をメンテナンスする場合において、ねじ軸２６を軸心廻りに回転することによりリフト２７を支持杆２５Ａの長手方向に移動させて後部カバー１２を大きく持ち上げることができ、これにより、後部カバー１２を人手によって直接持ち上げなくてもよく、作業労力の軽減を図ることができる。
また、耕耘時において、後部カバー１２の接地部分を地面から少し浮かせた状態で耕耘する場合は、リフト２７を支持杆２５Ａに対して後方向に移動させることにより、後部カバー１２が上方に揺動して該後部カバー１２の接地部分を地面から少し浮かせた状態で確実に保持することができると共に、後部カバー１２の上下位置調整を無段で調整することができ、後部カバー１２の下限位置を精度良く設定することができる。しかも、後部カバー１２を昇降させる場合、リフト２７がねじ軸２６及び支持杆２５に対して長手方向に移動するのみで、カバー弾下装置１９Ａ，１９Ｂ全体の長さは従来のように伸縮動作することがなくなり、ロータリ耕耘機本体にカバー弾下装置１９Ａ，１９Ｂを簡単かつコンパクトに設置することができる。 The other points are the same as those in the above embodiment.
According to the above-described embodiment, as in the case of the embodiment of FIGS. 1 to 7, when the rotary tiller 3 and the like are maintained, the screw 27 is rotated around the shaft center to lift the lift 27. The rear cover 12 can be lifted greatly by moving it in the longitudinal direction of the support rod 25A, so that the rear cover 12 does not have to be lifted directly by hand, and work labor can be reduced.
In addition, when plowing with the grounding portion of the rear cover 12 slightly lifted from the ground during plowing, the rear cover 12 swings upward by moving the lift 27 rearward with respect to the support rod 25A. Thus, the grounding portion of the rear cover 12 can be securely held in a state where it is slightly lifted from the ground, and the vertical position adjustment of the rear cover 12 can be adjusted continuously, and the lower limit position of the rear cover 12 can be adjusted. It can be set with high accuracy. Moreover, when the rear cover 12 is moved up and down, the lift 27 only moves in the longitudinal direction with respect to the screw shaft 26 and the support rod 25, and the entire length of the cover lowering devices 19A and 19B expands and contracts as in the conventional case. Therefore, the cover lowering devices 19A and 19B can be easily and compactly installed on the rotary tiller body.

さらに、本実施形態の場合、ねじ軸２６の後端部に、ねじ軸２６を回転操作するためのハンドル４３が設けられ、該ハンドル４３は支持杆２５Ａの後方側であって後部カバー１２の上方に配置されているので、ハンドル４３がねじ軸２６乃至支持杆２５Ａの前側にあれば、トラクタのタイヤやロアリンクと干渉するおそれがあるが、スペースの広い後部カバー１２の上方にハンドル４３を配置できるため、ハンドル４３の操作時に外部の部材と干渉するおそれがなくなり、ハンドル４３の操作を簡単になし得るようになる。
なお、前記実施の形態では、支持杆２５Ａは円筒状に形成され、ねじ軸２６は支持杆２５Ａ内に軸心廻り回転自在に挿通保持されているが、ねじ軸２６が支持杆２５Ａの長手方向に沿って配置されると共に支持杆２５Ａ長手方向に移動規制されかつ軸心廻り回転自在に保持されていればよく、支持杆２５Ａは筒状のものに限定されない。例えば、支持杆２５Ａを棒状のもので形成し、ねじ軸２６を円筒状に形成し、支持杆２５Ａに対してねじ軸２６を外嵌し、これにより、ねじ軸２６を支持杆２５Ａの長手方向に沿って配置すると共に支持杆２５Ａ長手方向に移動規制しかつ軸心廻り回転自在に保持するようにしてもよい。 Further, in the case of this embodiment, a handle 43 for rotating the screw shaft 26 is provided at the rear end portion of the screw shaft 26, and the handle 43 is behind the support rod 25 A and above the rear cover 12. If the handle 43 is on the front side of the screw shaft 26 or the support rod 25A, there is a risk of interference with the tractor tire or lower link, but the handle 43 is arranged above the wide rear cover 12. Therefore, there is no possibility of interference with an external member when the handle 43 is operated, and the handle 43 can be easily operated.
In the above-described embodiment, the support rod 25A is formed in a cylindrical shape, and the screw shaft 26 is inserted and held in the support rod 25A so as to be rotatable about the axis. However, the screw shaft 26 is in the longitudinal direction of the support rod 25A. The support rod 25A is not limited to a cylindrical shape, as long as the support rod 25A is moved along the longitudinal direction of the support rod 25A and restricted to move in the longitudinal direction of the support rod 25A. For example, the support rod 25A is formed in a rod shape, the screw shaft 26 is formed in a cylindrical shape, and the screw shaft 26 is externally fitted to the support rod 25A, whereby the screw shaft 26 is fitted in the longitudinal direction of the support rod 25A. And the movement of the support rod 25A in the longitudinal direction may be restricted and the shaft may be held so as to be rotatable about the axis.

一実施形態を示す一方のカバー弾下装置の側面断面図である。It is side surface sectional drawing of one cover bouncing apparatus which shows one Embodiment. 同ロータリ耕耘機の側面図である。It is a side view of the rotary tiller. 同ロータリ耕耘機の平面図である。It is a top view of the rotary tiller. 同一方のカバー弾下装置の平面断面図である。It is a plane sectional view of the one cover lowering device. 同リフト部分の正面断面図である。It is front sectional drawing of the lift part. 他方のカバー弾下装置における前端部は平面断面図となりその後側が側面断面図となる断面構成図である。The front end portion of the other cover lowering device is a cross-sectional configuration diagram in which the front end portion is a plan cross-sectional view and the rear side is a side cross-sectional view. 同バネ受け部材部分の側面断面図である。It is side surface sectional drawing of the same spring receiving member part. 他の実施形態を示す一方のカバー弾下装置の側面断面図である。It is side surface sectional drawing of one cover lowering apparatus which shows other embodiment. 同他方のカバー弾下装置において後端部は平面断面図となりその前側が側面断面図となる断面構成図である。In the other cover lowering device, the rear end portion is a cross-sectional plan view and the front side thereof is a side cross-sectional view.

Explanation of symbols

１ロータリ耕耘機
２機枠
３ロータリ耕耘部
１１上部カバー
１２後部カバー
１７前取付部
１８後取付部
１９Ａ一方のカバー弾下装置
２５Ａ支持杆
２６ねじ軸
２７リフト
２８Ａホルダ
２９Ａバネ
３１開口窓
５１内嵌部
５２外嵌部
５３連結部
５７バネ受部材
Ｓ１回動軸心 DESCRIPTION OF SYMBOLS 1 Rotary cultivator 2 Machine frame 3 Rotary cultivating part 11 Upper cover 12 Rear cover 17 Front attachment part 18 Rear attachment part 19A One cover retracting device 25A Support rod 26 Screw shaft 27 Lift 28A Holder 29A Spring 31 Opening window 51 Internal fitting Part 52 outer fitting part 53 connecting part 57 spring receiving member S1 rotation axis

Claims

The machine frame (2) is provided with a rotary tiller (3) for tilling the field, and an upper cover (11) covering the upper side of the rotary tiller (3), on the rear end side of the upper cover (11). A rear cover (12) pivotally connected to be pivotable about a horizontal axis is provided, and the rear cover (12) is attached to the grounding direction across the rear cover (12) side and the machine frame (2) side. In a rotary cultivator provided with a cover lowering device (19A)
The cover lowering device (19A) is arranged along the longitudinal direction of the support rod (25A) projecting from one of the machine frame (2) or the rear cover (12) toward the other and the support rod (25A). The screw shaft (26) whose movement is restricted in the longitudinal direction of the support rod (25A) and rotatably held around the axis, and the machine frame (2) or the rear cover (12) of the support rod (25A). On the other side, a lift (27) that is movable in the longitudinal direction of the support rod (25A) and is held non-rotatable, and a machine frame (2) or a rear cover (12) from the lift (27) of the support rod (25A) A holder (28A) held movably in the longitudinal direction of the support rod (25A) on one side of
The lift (27) is screwed onto the screw shaft (26) so that the lift (27) moves in the longitudinal direction of the support rod (25A) by rotation around the axis of the screw shaft (26), and the holder (28A) The other of the machine frame (2) or the rear cover (12) is connected to the holder (28A) so that the rear cover (12) moves up and down by the movement in the longitudinal direction of the support rod (25A), and the rear cover (12). A rotary cultivator characterized in that a spring (29A) for pressing the holder (28A) toward the lift (27) is provided so as to urge the holder in the grounding direction.

A front mounting portion (17) is provided on the machine frame (2) side, a rear mounting portion (18) is provided on the rear cover (12) side, and the support rod (25A) is formed in a cylindrical shape and supported. An opening window (31) formed by opening a part in the circumferential direction of the flange (25A) is formed in the longitudinal direction of the support flange (25A), and is supported on one of the front mounting portion (17) or the rear mounting portion (18). The front end side or the rear end side of (25A) is swingably connected around the rotation axis (S2) in the left-right direction, and the screw shaft (26) is inserted and held in the support rod (25A) so as to be rotatable about the axis. The lift (27) includes an inner fitting portion (51) fitted into the support rod (25A), an outer fitting portion (52) fitted outside the support rod (25A), and an inner fitting portion (51). A connecting portion (53) for connecting the outer fitting portion (52) to the supporting rod (25A) via the opening window (31), and a lift (27 The lift (27) is held movably in the longitudinal direction of the support rod (25A) by fitting the inner fitting portion (51) and the outer fitting portion (52) to the support rod (25A), and the connecting portion (53 ) Is held in the opening window (31) of the support rod (25A) so that the lift (27) cannot be rotated around the shaft center, and the screw shaft (26) is fitted to the internal fitting portion (51) of the lift (27). The rotary cultivator according to claim 1, wherein a screw hole (54) into which the screw is engaged is provided.

A spring receiving member (57A) is fitted and held on one side of the machine casing (2) or the rear cover (12) of the support rod (25A) so as to be movable and adjustable in the longitudinal direction of the support rod (25A). 28A) is externally fitted to the machine frame (2) of the support rod (25A) or the other side of the rear cover (12) so as to be movable in the longitudinal direction of the support rod (25A), and the spring (29A) is constituted by a coil spring. The rotary tiller according to claim 1, wherein the rotary tiller is held in a compressed state between the spring receiving member (57A) of the support rod (25A) and the holder (28A). .

A handle (43) for rotating the screw shaft (26) is provided at the rear end portion of the screw shaft (26), and the handle (43) is located on the rear side of the support rod (25A) and is disposed on the rear cover. It is arrange | positioned above (12), The rotary tiller in any one of Claims 1-3 characterized by the above-mentioned.