JP4897528B2 - Mower - Google Patents

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JP4897528B2
JP4897528B2 JP2007077059A JP2007077059A JP4897528B2 JP 4897528 B2 JP4897528 B2 JP 4897528B2 JP 2007077059 A JP2007077059 A JP 2007077059A JP 2007077059 A JP2007077059 A JP 2007077059A JP 4897528 B2 JP4897528 B2 JP 4897528B2
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mower
support shaft
swing
arm
side portion
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JP2008228708A (en
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顕史 西野
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Kubota Corp
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Description

本発明は、走行機体にモーアを昇降自在に装着した草刈機に関する。   The present invention relates to a mower having a mower mounted on a traveling machine body so as to be movable up and down.

草刈機としては、走行機体の下部に回動支軸を介して上下揺動可能に配備した揺動アームにモーアを吊り下げ連結し、回動支軸を回動させてモーアを上げ下げ操作するよう構成されており、回動支軸を回動する手段として、機体後部に備えられた作業装置昇降用のリフトアームと回動支軸とをリンク連係し、リフトアームを油圧駆動して揺動させることで、揺動アームを回動支軸を介して揺動させるもの(例えば、特許文献1参照)や、回動支軸を機体内に配備した専用の油圧シリンダで回動操作して揺動アームを揺動させるもの(例えば、特許文献2参照)、等が知られている。   As a mower, the mower is suspended and connected to a swinging arm that is arranged to be swingable up and down via a rotating support shaft at the lower part of the traveling machine body, and the rotating support shaft is rotated to raise and lower the mower. As a means for rotating the rotation support shaft, the lift arm for raising and lowering the work device provided at the rear of the machine body and the rotation support shaft are linked to each other, and the lift arm is hydraulically driven to swing. As a result, the swing arm is swung through a rotation support shaft (for example, see Patent Document 1) or the rotation support shaft is swung by a dedicated hydraulic cylinder provided in the body. A device that swings an arm (see, for example, Patent Document 2) is known.

特開2001−86802号公報JP 2001-86802 A 特開2000−53032号公報JP 2000-53032 A

モーアは複数枚のバーブレードを左右に並列配備した横幅の広いものに構成されているので、このモーアを左右の揺動アームで左右バランス良く吊り下げ支持するために、左右の揺動アームの間隔を大きくすることが望ましい。左右の揺動アームの間隔を大きくすると、回動支軸は長いものとなる。このため、機体横幅の大きい大型機種においては、回動支軸の走行機体から左右への突出長さが比較的短いものになるが、機体横幅の小さい小型機種では、回動支軸の走行機体から左右への突出長さが長くなり、回動支軸の突出部位が撓みやすくなり、回動支軸の左右での突出部位での撓み量が異なってモーアが左右に傾き、左右部位での刈高さに差異が発生するおそれがあった。   The mower is constructed with a wide width with a plurality of bar blades arranged side by side in the left and right, so in order to suspend and support this mower with the left and right swing arms in a balanced manner, the spacing between the left and right swing arms It is desirable to increase. When the interval between the left and right swing arms is increased, the rotation support shaft becomes longer. For this reason, in a large model with a large body width, the protruding length of the pivot shaft from the traveling machine body to the left and right is relatively short. However, in a small model with a small machine width, the traveling machine body of the pivot shaft. The projecting part from the left to the right becomes longer, the projecting part of the rotating support shaft becomes easier to bend, the amount of bending at the projecting part on the left and right of the rotating support shaft is different, and the mower tilts to the left and right, There was a risk of differences in cutting height.

本発明は、このような点に着目してなされたものであって、走行機体の下部に配備したモーアを左右に傾くことなく昇降できるとともに、正確な刈高さを設定することができるようにすることを主たる目的としている。   The present invention has been made paying attention to such a point, and can move up and down a mower arranged in the lower part of the traveling aircraft without tilting left and right, and can set an accurate cutting height. The main purpose is to do.

第1の発明は、走行機体を構成する機体フレームの下部近くに機体左右両側の横外方に突出させて回動支軸を横架支承し、この回動支軸の左右両側の外方突出部に連結した揺動アームにモーアを吊り下げ連結し、前記機体フレームの横一側外方箇所に配備した固定ブラケットに、前記回動支軸の一端部を回動自在に支承するとともに、前記固定ブラケットに、前記回動支軸の回動を接当規制して前記揺動アームの下方揺動限界を制限する下限調節機構を装備してあり、前記下限調節機構は、前記回動支軸から突出された牽制アームが接当して前記揺動アームの下方揺動を規制する接当部材を、前記牽制アームの先端部と前記固定ブラケットとの間に備えて構成してあることを特徴とする。 According to a first aspect of the present invention, a rotating support shaft is supported horizontally by projecting laterally on the left and right sides of the airframe near the lower part of the airframe constituting the traveling airframe, and outwardly projecting on the left and right sides of the rotating support shaft. The mower is suspended and connected to a swinging arm connected to a portion, and one end portion of the rotating support shaft is rotatably supported on a fixed bracket provided on a laterally outer side of the body frame. the fixing bracket, wherein Ri a rotation of the rotating shaft by abutment regulating equipped with a lower limit adjusting mechanism which limits the downward swing limits of the oscillating arm tare, the lower limit adjustment mechanism, the Kaido支A contact member that restricts downward swing of the swing arm by contact with a check arm that protrudes from a shaft is provided between the distal end of the check arm and the fixed bracket. Features.

上記構成によると、回動支軸の外方突出部の撓みが固定ブラケットによって抑制されるとともに、この撓みが抑制された部位で回動支軸が下限調節機構による接当規制作用を受けて、揺動アームの下方揺動限界、換言すればモーアの下限高さが正確に規制される。   According to the above configuration, the bending of the outward projecting portion of the rotation support shaft is suppressed by the fixing bracket, and the rotation support shaft is subjected to the contact regulation action by the lower limit adjustment mechanism at the portion where the bending is suppressed, The lower swing limit of the swing arm, in other words, the lower limit height of the mower is accurately regulated.

従って、第1の発明によると、回動支軸の撓みを抑制してモーアを傾くことなく昇降できるとともに、下限調節機構を用いてモーアを所望の高さに維持して安定した刈高さでの草刈り作業を行うことができる。   Therefore, according to the first aspect of the invention, the mower can be lifted and lowered without restraining the bending of the rotating support shaft, and the mower is maintained at a desired height by using the lower limit adjustment mechanism, and the mowing height is stable. Mowing work.

第2の発明は、上記第1の発明において、
前記固定ブラケットに縦辺部と横辺部を備え、前記縦辺部の下端部に前記回動支軸を支承するとともに、前記横辺部に前記下限調節機構を装備し、前記横辺部の機体内方の端部を前記機体フレームに連結してあるものである。
According to a second invention, in the first invention,
The fixed bracket includes a vertical side portion and a horizontal side portion, and supports the rotation support shaft at a lower end portion of the vertical side portion, and is equipped with the lower limit adjusting mechanism on the horizontal side portion, in which the ends of the body inward are connected to the body frame.

上記構成によると、回動支軸を支承した縦辺部と下限調節機構を装備した横辺部とは相対位置変化がないので、例えば、固定ブラケットに回動支軸を支承するとともに、機体フフレームに別途装備した下限調節機構で回動支軸の回動規制を行う場合に比べて、組立て誤差の発生が少なく、精度の安定した下限調節を行うことができる。   According to the above configuration, there is no change in the relative position between the vertical side portion that supports the rotation support shaft and the horizontal side portion that is equipped with the lower limit adjustment mechanism. Compared with the case where the rotation of the rotation support shaft is restricted by a lower limit adjustment mechanism provided separately on the frame, the assembly error is less likely to occur, and the stable lower limit adjustment can be performed.

第3の発明は、上記第2の発明において、
前記回動支軸から前記揺動アーム突出方向と逆方向に突出された前記牽制アームを、前記固定ブラケットにおける前記横辺部の下側に配備した段付きの前記接当部材における各接当部に下方から接当させて揺動アームの下方揺動を規制するように前記下限調節機構を構成し、前記固定ブラケットの横辺部を、前記機体フレームの横外側から突設された連結部材に下方から当て付けて連結してあるものである。
According to a third invention, in the second invention,
The restraint arms protruded to the swing arm projecting direction opposite to the direction from the rotation support shafts, each contact part of the contact member of the stepped deployed under side of the lateral side portion of the fixing bracket The lower limit adjusting mechanism is configured so as to restrict the downward swing of the swing arm by contacting from below, and the lateral side portion of the fixed bracket is connected to a connecting member protruding from the lateral outer side of the body frame. It is connected by applying from below.

上記構成によると、モーアを下限まで降ろして吊下げ支持した状態において、モーアの重量で上方揺動する牽制アームは接当部材で受け止められ、その接当負荷は固定ブラケットの横辺部を介して機体フレームの連結部材に受け止められる。この場合、牽制アームを揺動アームより短いものに構成すると、揺動アームの先端に働くモーア吊下げ荷重重量が揺動アームと牽制アームとのレバー長さ比で拡大されて接当部材に上向きに作用することになるが、接当部材を支持する固定ブラケットの横辺部が機体側の固定部材に下方から当て付け連結されているので、連結部位に大きい負荷が直接に作用することがなく、確実な連結状態を安定維持することができる。   According to the above configuration, in a state where the mower is lowered to the lower limit and supported by suspension, the check arm that swings upward with the weight of the mower is received by the contact member, and the contact load is received via the lateral side of the fixed bracket. It is received by the connecting member of the fuselage frame. In this case, if the check arm is configured to be shorter than the swing arm, the mower suspension load weight acting on the tip of the swing arm is increased by the lever length ratio of the swing arm and the check arm so that the contact member faces upward. However, since the lateral side portion of the fixing bracket that supports the contact member is connected to the fixing member on the fuselage side from below, the large load is not directly applied to the connecting portion. Thus, a reliable connection state can be stably maintained.

第4の発明は、上第1〜3のうちのいずれか一つの発明において、
走行機体の後部に配備されたリフトアームと前記回動支軸とをリンク連係し、リフトアームの揺動によって前記揺動アームを駆動揺動するよう構成してあるものである。
A fourth invention is any one of the first to third inventions,
A lift arm provided at the rear part of the traveling machine body is linked to the rotation support shaft, and the swing arm is driven to swing by swinging the lift arm.

上記構成によると、機体後部に各種の作業装置を連結してリフトアームで昇降させる作業形態と、モーアを配備してリフトアームで昇降させる草刈り作業形態とを使い分けることができ、走行機体の汎用性を高めることができる。   According to the above configuration, various working devices can be connected to the rear part of the aircraft and lifted with a lift arm, and mowing work with a mower can be lifted and lowered with a lift arm. Can be increased.

図1に本発明に係る草刈機の全体側面が、図2に草刈機の全体平面がそれぞれ示されている。この草刈機は、前輪1および後輪2を備えた四輪駆動型の走行機体3の下部に、バーブレード型のモーアMを昇降自在に連結装備して構成されている。   FIG. 1 shows an overall side view of the mower according to the present invention, and FIG. 2 shows an overall plane of the mower. This mower has a bar blade type mower M connected to a lower part of a four-wheel drive type traveling machine body 3 having a front wheel 1 and a rear wheel 2 so as to be movable up and down.

前記走行機体3は、機体前部のエンジン4と主クラッチハウジング5とを直結するとともに、主クラッチハウジング5とミッションケース6を板金中空構造の機体フレーム7で連結して構成されており、主クラッチハウジング5から導出されたエンジン動力を、ミッションケース6の前端に連結した静油圧式無段変速装置(HST)8に入力して正逆に無段変速し、その正逆に無段変速された動力をミッションケース6内で複数段にギヤ変速して左右の後輪2に伝達するとともに、分岐した走行系動力を機体前方に軸伝達して前輪1を駆動するよう構成されている。静油圧式無段変速装置8は、運転ステップ9の右側に配備された前進ペダル10fを踏み込むことで無段の前進変速を行い、後進ペダル10bを踏み込むことで無段の後進変速を行うようになっている。運転ステップ9の右側前方には左右一対のサイドブレーキペダル11が配備されている。各サイドブレーキペダル11はミッションケース6の左右に組付けられたサイドブレーキ(図示せず)にそれぞれリンク連係されており、前輪1を操向しながら旋回内側のサイドブレーキペダル11を踏み込むことで、旋回内側の後輪2を制動して小回り旋回を行うことができるように構成されている。   The traveling machine body 3 is configured by directly connecting the engine 4 and the main clutch housing 5 at the front part of the machine body, and connecting the main clutch housing 5 and the transmission case 6 with a body frame 7 having a sheet metal hollow structure. The engine power derived from the housing 5 is input to a hydrostatic continuously variable transmission (HST) 8 connected to the front end of the transmission case 6 and continuously variable in the forward and reverse directions, and continuously variable in the forward and reverse directions. The motive power is gear-shifted in a plurality of stages in the transmission case 6 and transmitted to the left and right rear wheels 2, and the branched traveling system power is transmitted to the front of the machine body to drive the front wheels 1. The hydrostatic continuously variable transmission 8 performs a stepless forward shift by depressing the forward pedal 10f provided on the right side of the operation step 9, and performs a stepless reverse shift by depressing the reverse pedal 10b. It has become. A pair of left and right side brake pedals 11 are arranged in front of the right side of the driving step 9. Each side brake pedal 11 is linked to a side brake (not shown) assembled to the left and right of the mission case 6, and by stepping on the side brake pedal 11 inside the turn while steering the front wheel 1, The rear wheel 2 on the inner side of the turn is braked so that a small turn can be performed.

前記静油圧式無段変速装置8に入力されたエンジン動力の一部は、変速されることなくそのままミッションケース6内のPTO伝動系に伝達され、ミッションケース6の後部に装備されたリヤPTO軸13と、ミッションケース6の下部に装備されたミッドPTO軸14から、走行速度に関係なく定速で回転するライブPTOとして取り出されるようになっている。ミッションケース6の後部には、3点リンク機構15が装備されるとともに、この3点リンク機構15のロアリンク15aを駆動昇降する油圧駆動式のリフトアーム16がミッションケース6の上部に備えられ、3点リンク機構15に各種の作業装置を連結するとともに、連結した作業装置をリヤPTO軸13で駆動することで、広範な作業を行うことができるようになっている。   A part of the engine power input to the hydrostatic continuously variable transmission 8 is transmitted to the PTO transmission system in the transmission case 6 without being shifted, and the rear PTO shaft mounted on the rear portion of the transmission case 6 13 and a mid PTO shaft 14 provided at the lower portion of the mission case 6 are extracted as a live PTO that rotates at a constant speed regardless of the traveling speed. At the rear of the mission case 6, a three-point link mechanism 15 is provided, and a hydraulically driven lift arm 16 that drives the lower link 15 a of the three-point link mechanism 15 is provided at the top of the mission case 6. Various work devices are connected to the three-point link mechanism 15, and a wide range of work can be performed by driving the connected work devices with the rear PTO shaft 13.

前記モーアMは、フラット型に形成されたモーアデッキ21の内部に縦向きの駆動軸22を介して同方向に回転駆動される3枚のバーブレード23を左右に並列装備し、モーアデッキ21の右端から刈草を排出するサイドディスチャージ式に構成されており、平行四連リンク状に配備された前リンク24と後リンク25を介して平行昇降可能に走行機体3に連結支持されている。モーアデッキ21の中央上部には、走行機体3のミッドPTO軸14に軸連動された入力ギヤケース26が装備されており、ミッドPTO軸14からの動力が入力ギヤケース26で縦軸回転に変換されて中央のバーブレード23の駆動軸22に伝達されるとともに、中央のバーブレード23の駆動軸22と左右のバーブレード23の各駆動軸22とがベルト連動され、全部のバーブレード23が同方向(図2において時計方向)に回転駆動されて、各バーブレード23で刈取り取られた刈草がそれぞれ右方に飛散送出されるようになっている。   The mower M is equipped with three bar blades 23 which are driven in parallel in the same direction via a vertical drive shaft 22 inside a mower deck 21 formed in a flat shape, and from the right end of the mower deck 21. It is configured as a side discharge type that discharges cut grass, and is connected to and supported by the traveling machine body 3 through a front link 24 and a rear link 25 arranged in a parallel quadruple link shape so as to be movable in parallel. An input gear case 26 that is linked to the mid PTO shaft 14 of the traveling machine body 3 is provided at the center upper portion of the mower deck 21, and the power from the mid PTO shaft 14 is converted into a vertical axis rotation by the input gear case 26. Are transmitted to the drive shaft 22 of the bar blade 23, and the drive shaft 22 of the central bar blade 23 and the drive shafts 22 of the left and right bar blades 23 are belt-linked, so that all the bar blades 23 are in the same direction (see FIG. The grass cut by each of the bar blades 23 is rotated and driven clockwise in FIG.

図4に示すように、走行機体3における機体フレーム7の下部に、左右に長い回動支軸30が機体フレーム7から左右に突出する状態に横架連結され、機体フレーム7の横外方箇所において前記回動支軸30から前方に向けて突設された左右一対の揺動アーム31の遊端部に、モーアデッキ21が連結ロッド32を介して吊り下げ支持されている。   As shown in FIG. 4, a pivot shaft 30 that is long on the left and right is horizontally connected to a lower portion of the body frame 7 in the traveling body 3 so as to protrude from the body frame 7 to the left and right. The mower deck 21 is suspended and supported via a connecting rod 32 at the free ends of a pair of left and right swing arms 31 projecting forward from the pivot support shaft 30.

回動支軸30の左側突出箇所から上向きに突設された操作アーム33と走行機体3の後部に備えられたリフトアーム16とが、以下のようにリンク連係されている。つまり、図3に示すように、ミッションケース6の後部左側面に支点a周りに揺動可能に操作リンク34が枢支連結され、この操作リンク34の一端から前方に枢支延出された連係ロッド35の前端が、回動支軸30から突設された前記操作アーム33に枢支連結されるとともに、前記操作リンク34から屈曲延出された係止部34aが3点リンク機構15における左側のロアーリンク15aに上方から係合されており、リフトアーム16によってロアーリンク15aが上方に駆動揺動されることで、回動支軸30が揺動アーム31を上方揺動する方向に回動され、ロアーリンク15aが下方に自重揺動することで、回動支軸30が揺動アーム31を下方揺動する方向に回動されるようになっている。   The operation arm 33 projecting upward from the left-side protruding portion of the rotation support shaft 30 and the lift arm 16 provided at the rear portion of the traveling machine body 3 are linked to each other as follows. That is, as shown in FIG. 3, the operation link 34 is pivotally connected to the rear left side surface of the mission case 6 so as to be swingable around the fulcrum a, and the linkage is pivotally extended forward from one end of the operation link 34. A front end of the rod 35 is pivotally connected to the operation arm 33 projecting from the rotation support shaft 30, and a locking portion 34 a bent and extended from the operation link 34 is a left side in the three-point link mechanism 15. The lower link 15a is engaged with the lower link 15a from above, and the lower link 15a is driven and swung upward by the lift arm 16, so that the pivot shaft 30 pivots in the direction of swinging the swing arm 31 upward. Then, the lower link 15a swings by its own weight downward so that the rotation support shaft 30 is rotated in the direction of swinging the swing arm 31 downward.

この草刈機は、基本的に、モーアMを地面から浮かして刈取りを行うとともに、走行機体3を刈草排出方向と反対側に旋回させながら回り刈りを行うよう構成されており、この回り刈りにおける刈り残しを少なくするために、モーアMは少し機体左側に偏位して配備されている。刈取り作業を行う際に、モーアMが地上の障害物や***に接触することを回避するために、モーアデッキ21の前後左右箇所には障害物乗越え用の遊転ローラ37が配備されている。   This mower is basically configured to perform mowing while floating the mower M from the ground and rotating the traveling machine body 3 in a direction opposite to the mowing grass discharging direction. In order to reduce the remaining, the mower M is slightly deviated to the left side of the aircraft. In order to prevent the mower M from coming into contact with the obstacles and ridges on the ground when performing the cutting operation, idle rollers 37 for getting over the obstacle are provided at the front, rear, left and right portions of the mower deck 21.

図4に示すように、前記回動支軸30の左端部(図4では右端部)が、走行機体3に連結した固定ブラケット40に回動自在に支承されている。図7に示すように、固定ブラケット40には縦辺部40aと横辺部40bとが備えられており、縦辺部40aの下端ボス40cに回動支30が回動自在に支承されるとともに、横辺部40bの機体内方端部が機体フレーム7から突設された連結部材41にボルト連結されている。連結部材41は側面形状がU形に屈曲形成されるとともに、固定ブラケット40の横辺部40bは、前部折り上げ40baと後部折り下げ辺40bbを備えた階段状に屈曲形成されており、横辺部40bの上面を固定金具41に下方から当て付けるとともに、横辺部40bの前部折り上げ40baを固定部材41の前端に前方から当て付けて位置決めした状態で脱着可能に前後方向および上下方向からボルト連結されている。   As shown in FIG. 4, the left end portion (right end portion in FIG. 4) of the rotation support shaft 30 is rotatably supported by a fixed bracket 40 connected to the traveling machine body 3. As shown in FIG. 7, the fixed bracket 40 includes a vertical side portion 40 a and a horizontal side portion 40 b, and the rotary support 30 is rotatably supported by the lower end boss 40 c of the vertical side portion 40 a. The body side end of the lateral side portion 40b is bolted to a connecting member 41 projecting from the body frame 7. The connecting member 41 has a side surface bent in a U shape, and the lateral side portion 40b of the fixing bracket 40 is bent and formed in a stepped shape having a front folded-up side 40ba and a rear folded-down side 40bb. The upper surface of the side portion 40b is applied to the fixing bracket 41 from below, and the front side folded portion 40ba of the horizontal side portion 40b is applied to the front end of the fixing member 41 from the front and positioned so as to be removable. The bolt is connected from.

固定ブラケット40の横辺部40bには、モーアMの下降限度を規制して刈り高さを設定調節する下限調節機構42が備えられている。この下限調節機構42は、固定ブラケット40の横辺部40bに貫通装備されたノブ付きの操作軸43と、その下方突出部に連結された段付きの接当部材44とで構成されており、回動支軸30から揺動アーム突出方向と逆方向に突出された牽制アーム45を、接当部材44に下方から接当させて揺動アーム31の下方揺動を規制するようになっている。   The lateral side portion 40b of the fixed bracket 40 is provided with a lower limit adjusting mechanism 42 that regulates the lowering limit of the mower M and sets and adjusts the cutting height. The lower limit adjustment mechanism 42 includes an operation shaft 43 with a knob that is provided through the lateral side portion 40b of the fixed bracket 40, and a stepped contact member 44 that is connected to a downward projecting portion thereof. A check arm 45 protruding from the rotation support shaft 30 in the direction opposite to the protruding direction of the swing arm is brought into contact with the contact member 44 from below so as to restrict the downward swing of the swing arm 31. .

接当部材44には螺旋階段状に多段の接当部44aが形成されており、図5に示すように、操作軸43を回動操作して、牽制アーム45の先端に形成された接当縁45aに対向する接当部44aを選択することで、モーアMを自重下降させた際に、牽制アーム45が接当部材44の選択された接当部44aに下方から接当して回動支軸30の下方回動を阻止することで、揺動アーム31の下方揺動が制限されてモーアMの下限高さが決められるようになっている。従って、高位の接当部44aを選択して揺動アーム31の下限を下げることで刈高さを低く調節することができ、下位の接当部44aを選択して揺動アーム31の下限を上げることで刈高さを高く調節することができるのである。   The contact member 44 is formed with a multistage contact portion 44a in a spiral staircase shape, and as shown in FIG. 5, the contact shaft formed at the tip of the check arm 45 by rotating the operation shaft 43. By selecting the contact portion 44a that faces the edge 45a, when the mower M is lowered by its own weight, the check arm 45 contacts the selected contact portion 44a of the contact member 44 from below and rotates. By preventing the pivot 30 from rotating downward, the downward swing of the swing arm 31 is limited, and the lower limit height of the mower M is determined. Therefore, the cutting height can be adjusted to be low by selecting the higher contact portion 44a and lowering the lower limit of the swing arm 31, and the lower contact portion 44a is selected to reduce the lower limit of the swing arm 31. By raising it, the cutting height can be adjusted higher.

図6に示すように、牽制アーム45の根元側には別の接当縁45bが形成されるとともに、これに対向可能な接当部44bが接当部材44に形成されている。この接当部44bは、揺動アーム31が最も上方に揺動された状態で接当縁45bに接当する高さに形成されており、モーアMを上限まで持上げた状態で接当縁45bに接当部44bが対向するよう接当部材44を回動調節しておくことで、リフトアーム16が不用意に下方揺動されても、モーアMが自重落下することを阻止することができ、主として移動走行時におけるモーアMの上限ロックに利用する。   As shown in FIG. 6, another contact edge 45 b is formed on the base side of the check arm 45, and a contact portion 44 b that can face the contact edge 45 b is formed on the contact member 44. The contact portion 44b is formed at a height that makes contact with the contact edge 45b in a state where the swing arm 31 is swung upward, and the contact edge 45b with the mower M lifted to the upper limit. By adjusting the contact member 44 so that the contact portion 44b faces the front, the mower M can be prevented from falling by its own weight even when the lift arm 16 is inadvertently swung downward. It is mainly used to lock the upper limit of the mower M during traveling.

草刈機の全体側面図Overall side view of mower 草刈機の全体平面図Overall plan view of mower モーア昇降構造を示す側面図Side view showing mower lifting structure モーア支持構造の正面図Front view of mower support structure 下限調節機構の側面図Side view of the lower limit adjustment mechanism 下限調節機構の上限ロック状態を示す側面図Side view showing the upper limit lock state of the lower limit adjustment mechanism 下限調節機構の分解した斜視図An exploded perspective view of the lower limit adjustment mechanism

3 走行機体
7 機体フレーム
16 リフトアーム
30 回動支軸
31 揺動アーム
40 固定ブラケット
40a 縦辺部
40b 横辺部
41 連結部材
42 下限調節機構
44 接当部材
44a 接当部
45 牽制アーム
M モーア
3 traveling aircraft
7 Machine frame 16 Lift arm 30 Rotating support shaft 31 Swing arm 40 Fixed bracket 40a Vertical side portion 40b Horizontal side portion 41 Connecting member 42 Lower limit adjustment mechanism 44 Contact member 44a Contact portion 45 Checking arm M Moore

Claims (4)

走行機体を構成する機体フレームの下部近くに機体左右両側の横外方に突出させて回動支軸を横架支承し、
この回動支軸の左右両側の外方突出部に連結した揺動アームにモーアを吊り下げ連結し、前記機体フレームの横一側外方箇所に配備した固定ブラケットに、前記回動支軸の一端部を回動自在に支承するとともに、前記固定ブラケットに、前記回動支軸の回動を接当規制して前記揺動アームの下方揺動限界を制限する下限調節機構を装備してあり、
前記下限調節機構は、前記回動支軸から突出された牽制アームが接当して前記揺動アームの下方揺動を規制する接当部材を、前記牽制アームの先端部と前記固定ブラケットとの間に備えて構成してあることを特徴とする草刈機。
Near the lower part of the body frame that constitutes the traveling body , it projects laterally outward on the left and right sides of the body and supports the pivot shaft horizontally.
A mower is suspended and connected to swing arms connected to the outward projecting portions on both the left and right sides of the pivot support shaft, and a fixed bracket disposed on the laterally outer side of the body frame is attached to the pivot support shaft. One end is pivotably supported, and the fixed bracket is equipped with a lower limit adjustment mechanism that restricts the pivot of the pivot support shaft to limit the downward swing limit of the swing arm. The
The lower limit adjusting mechanism includes a contact member that restricts downward swinging of the swing arm by contact of a check arm that protrudes from the rotation support shaft, and a lower end adjustment mechanism that connects the distal end of the check arm and the fixed bracket. A mower characterized in that it is arranged in between .
前記固定ブラケットに縦辺部と横辺部を備え、前記縦辺部の下端部に前記回動支軸を支承するとともに、前記横辺部に前記下限調節機構を装備し、前記横辺部の機体内方の端部を前記機体フレームに連結してある請求項1記載の草刈機。 The fixed bracket includes a vertical side portion and a horizontal side portion, and supports the rotation support shaft at a lower end portion of the vertical side portion, and is equipped with the lower limit adjusting mechanism on the horizontal side portion, The mower according to claim 1, wherein an end of the body is connected to the body frame. 前記回動支軸から前記揺動アーム突出方向と逆方向に突出された前記牽制アームを、前記固定ブラケットにおける前記横辺部の下側に配備した段付きの前記接当部材における各接当部に下方から接当させて揺動アームの下方揺動を規制するように前記下限調節機構を構成し、前記固定ブラケットの横辺部を、前記機体フレームの横外側から突設された連結部材に下方から当て付けて連結してある請求項2記載の草刈機。 The restraint arms protruded to the swing arm projecting direction opposite to the direction from the rotation support shafts, each contact part of the contact member of the stepped deployed under side of the lateral side portion of the fixing bracket The lower limit adjusting mechanism is configured so as to restrict the downward swing of the swing arm by contacting from below, and the lateral side portion of the fixed bracket is connected to a connecting member protruding from the lateral outer side of the body frame. The mower according to claim 2, wherein the mower is connected by being applied from below. 走行機体の後部に配備されたリフトアームと前記回動支軸とをリンク連係し、リフトアームの揺動によって前記揺動アームを駆動揺動するよう構成してある請求項1〜3のいずれか一項に記載の草刈機。   The lift arm arranged at the rear part of the traveling machine body and the rotation support shaft are linked to each other, and the swing arm is driven to swing by swinging the lift arm. The mower according to one item.
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