JP2007001380A5 - - Google Patents

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JP2007001380A5
JP2007001380A5 JP2005182176A JP2005182176A JP2007001380A5 JP 2007001380 A5 JP2007001380 A5 JP 2007001380A5 JP 2005182176 A JP2005182176 A JP 2005182176A JP 2005182176 A JP2005182176 A JP 2005182176A JP 2007001380 A5 JP2007001380 A5 JP 2007001380A5
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rear wheel
transmission case
downward
wheel transmission
seedling planting
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JP2007001380A (en
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乗用型田植機Ride type rice transplanter

この発明は、乗用型田植機の後輪下降装置に関し、農業機械の技術分野に属する。   The present invention relates to a rear wheel lowering device for a riding type rice transplanter and belongs to the technical field of agricultural machinery.

従来、走行車輌の一例である乗用型田植機では、例えば、特許文献1に示されているように、左右の後輪を左右独立的に上下揺動自在に支持し、旋回時に機体後部の苗植付部を田面から所定の非作業位置まで上昇させると、この上昇操作に連動して左右の後輪を下降させることにより、機体の後部を持ち上げて機体を前下がり気味にすることで、機体の旋回が円滑に行えるようにしている。
特開2004−275059号公報
Conventionally, in a riding type rice transplanter that is an example of a traveling vehicle, for example, as shown in Patent Document 1, left and right rear wheels are supported so as to be swingable up and down independently, and the seedlings at the rear of the body are turned during turning. When the planting part is raised from the surface to a predetermined non-working position, the left and right rear wheels are lowered in conjunction with this raising operation, thereby lifting the rear part of the aircraft and making the aircraft appear to be lowered forward. Can be turned smoothly.
JP 2004-275059 A

上記従来の機体後部持ち上げ、植付部の上下に連動した構成であり、植付部を上昇させると、前後進に関係なく機体の後部が持ち上げられるため、後進から畦越えや、アユミを登る場合、逆にバランスを悪くする問題があった。また、構成上、植付部を下げた植付作業時は機体の後部が持ち上げられない為、機体が前上がり姿勢になったり、苗の植付姿勢が悪化する問題がある。 Additional lifting the rear of the conventional aircraft, a configuration in conjunction vertically planting unit, increasing the planting unit, the forward-reverse rear of the machine body is lifted regardless of order, and beyond ridge from the reverse, When climbing Ayumi, there was a problem of poor balance. In addition, since the rear part of the aircraft cannot be lifted during planting work with the planting part lowered, there is a problem that the aircraft is in a front-up posture or the seedling planting posture is deteriorated.

本発明では、機体の前後傾斜姿勢を修正するために自動的に後輪を下降させる機構を、機体の重量アップやコストアップを抑えて簡単に構成することにある。   In the present invention, a mechanism for automatically lowering the rear wheels to correct the front / rear tilt posture of the airframe is configured simply by suppressing an increase in weight and cost of the airframe.

この発明は、上記課題を解決すべく次のような技術的手段を講じた。
すなわち、請求項1に記載の発明は、前輪(2)及び後輪(3)を備える車体(1)の後方に昇降リンク機構(7)を介して苗植付部(6)を設け、後輪伝動ケース(30)を後輪車軸(31)より前側の回動支点(P)回りに上下回動可能に構成すると共に、後輪伝動ケース(30)を下方に回動付勢する圧縮スプリング(34)を設け、通常の走行時には機体の自重で圧縮スプリング(34)が縮んで後輪(3)が上動状態となり、機体の前進で後輪に所定以上の駆動負荷が生じたときにはその駆動反力により後輪伝動ケース(30)が下側へ回動して後輪(3)が下動状態となる構成とした乗用型田植機とする。
In order to solve the above problems, the present invention has taken the following technical means.
That is, the invention described in claim 1 is provided with a seedling planting part (6) via a lifting link mechanism (7) on the rear side of a vehicle body (1) having a front wheel (2) and a rear wheel (3). The wheel transmission case (30) is configured to be rotatable up and down around the rotation fulcrum (P) on the front side from the rear wheel axle (31), and the compression spring that urges the rear wheel transmission case (30) to rotate downward. (34) is provided, and during normal travel, the compression spring (34) contracts due to the weight of the fuselage and the rear wheel (3) is in an upward movement state. The riding type rice transplanter is configured such that the rear wheel transmission case (30) is rotated downward by the driving reaction force and the rear wheel (3) is moved downward.

従って、機体の前進での畦越え時、前進でのトラックへの積込時あるいは耕盤が深い圃場での前進植付時において、後輪(3)に所定以上の駆動負荷が生じたときには、その駆動反力により圧縮スプリング(34)が伸びて後輪(3)が下動状態となり、機体が前上がり姿勢になって前輪が浮き上がったりするのを防止できる。また、後輪(3)が下動状態となることで、植付部(6)の必要以上の沈下により苗植付姿勢が乱れたりするのを防止することができる。 Therefore, when a driving load exceeding a predetermined value is generated on the rear wheel (3) at the time of traverse over the ridge in the forward movement of the aircraft, loading on the truck in the forward movement or forward planting in a field where the cultivator is deep, The driving reaction force causes the compression spring (34) to extend and the rear wheel (3) to move downward, preventing the airframe from rising forward and the front wheel from floating. Moreover, it can prevent that a seedling planting attitude | position is disturb | confused by the rear wheel (3) being in a downward movement state due to the planting section (6) sinking more than necessary.

また、請求項2に記載の発明は、前輪(2)及び後輪(3)を備える車体(1)の後方に昇降リンク機構(7)を介して苗植付部(6)を設け、後輪伝動ケース(30)を後輪車軸(31)より前側の回動支点(P)回りに上下回動可能に構成すると共に、後輪伝動ケースを下方に回動付勢するクッションゴム(37)を設け、クッションゴム(37)のたわみにより後輪(3)が上動状態となる構成とした乗用型田植機とする。In the invention according to claim 2, a seedling planting part (6) is provided on the rear side of the vehicle body (1) including the front wheel (2) and the rear wheel (3) via the lifting link mechanism (7). The wheel transmission case (30) is configured to be rotatable up and down around a rotation fulcrum (P) on the front side of the rear wheel axle (31), and cushion rubber (37) for urging the rear wheel transmission case downward. And a riding type rice transplanter having a configuration in which the rear wheel (3) is moved upward by the deflection of the cushion rubber (37).

従って、クッションゴム(37)のたわみにより後輪(3)が上動状態となることで、機体の前下がり状態を緩和させ、前輪(2)の沈み込みを防止できる。Therefore, the rear wheel (3) is in the upward movement state due to the deflection of the cushion rubber (37), so that the front lowering state of the airframe can be relaxed and the front wheel (2) can be prevented from sinking.

また、請求項3に記載の発明は、植付昇降レバー(16)により苗植付部(6)を上げ操作すると、後輪伝動ケース(30)が下側へ回動して後輪(3)が下動状態となる構成とした請求項1又は2に記載の乗用型田植機とする。According to the third aspect of the present invention, when the seedling planting part (6) is operated to be raised by the planting lift lever (16), the rear wheel transmission case (30) is rotated downward and the rear wheel (3 ) Is a riding type rice transplanter according to claim 1 or 2 configured to be in a downward movement state.

従って、請求項1又は2に記載の発明の作用に加えて、苗植付部(6)の上げ操作時には後輪(3)の接地性を高め、下げ操作時には機体前部が浮き上がるような高負荷時のみ後輪(3)が下動する。Therefore, in addition to the effects of the invention according to claim 1 or 2, the grounding property of the rear wheel (3) is improved during the raising operation of the seedling planting part (6), and the front part of the body is raised during the lowering operation. The rear wheel (3) moves down only when loaded.

請求項1に記載の発明によれば、機体の前進での畦越え時、前進でのトラックへの積込時あるいは耕盤が深い圃場での前進植付時は、駆動反力により後輪(3)が下動状態となり、機体が前上がり姿勢になって前輪が浮き上がったり、あるいは苗の植付姿勢が悪化したりするような事態を未然に防止することができる。 According to the first aspect of the present invention, the rear wheel ( due to the driving reaction force) is used when the machine body moves forward over the ridge, when it is loaded onto the truck in advance, or when it is planted forward in a deep farm field. It is possible to prevent a situation in which 3) is in the downward movement state and the aircraft is in a front-up position and the front wheels are lifted or the seedling planting posture is deteriorated.

請求項2に記載の発明によれば、後進での畦越えが容易にでき、走行抵抗の大きい湿田での後進性能が向上する。According to the second aspect of the present invention, it is possible to easily go over the reed in reverse, and the reverse performance in a wet field with a large running resistance is improved.

請求項3に記載の発明によれば、請求項1又は2に記載の発明の効果に加えて、駆動反力の小さい路上走行では後輪(3)の接地性を高め、駆動反力の大きい圃場走行では必要以上に後輪(3)が下動しないように抵抗を与えて安定した走行が可能となる。According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, in the road running with a small driving reaction force, the grounding property of the rear wheel (3) is improved and the driving reaction force is large. In field running, stable running is possible by giving resistance so that the rear wheel (3) does not move down more than necessary.

この発明の実施例を図面に基づき説明する。
図1及び図2は、乗用型の4条植田植機を示すものであり、車体1の前後には走行車輪としての左右一対の前輪2,2及び後輪3,3が架設されている。車体上前部には操作ボックス4及びステアリングハンドル5等を有する操縦装置が設置され、また、車体後方部には昇降可能な苗植付部6が装備されている。操縦装置の後側に運転席9が設置され、運転席の下側に田植機の各部に動力を伝達するエンジンEが搭載されている。
An embodiment of the present invention will be described with reference to the drawings.
FIGS. 1 and 2 show a riding type four-row Ueda transplanter. A pair of left and right front wheels 2 and 2 and rear wheels 3 and 3 are installed as front and rear wheels of a vehicle body 1. A steering device having an operation box 4 and a steering handle 5 is installed at the front upper part of the vehicle body, and a seedling planting part 6 that can be moved up and down is provided at the rear part of the vehicle body. A driver's seat 9 is installed on the rear side of the control device, and an engine E that transmits power to each part of the rice transplanter is mounted below the driver's seat.

前記ステアリングハンドル5は、これの回動操作によりステアリングポスト17内のステアリング軸18からステアリングケース内を経て減速回転される出力軸、ピットマンア−ム及び操向ロッド等を介して左右の前輪2,2を操向させ操舵するようになっている。   The steering handle 5 is rotated by the steering shaft 18 in the steering post 17 through an output shaft, a pitman arm, a steering rod, and the like that are decelerated and rotated through the steering case. Is steered.

苗植付部6は、車体の後部に昇降リンク機構7を介して昇降可能に装着され、昇降用油圧シリンダ8の伸縮作動により昇降する構成であり、本例では、油圧シリンダ8の引き側で苗植付部を上昇させる構成としている。そして、昇降用油圧シリンダ8の支点Q1と昇降リンク機構7の支点Q2,Q3とは一枚のプレート15で結び、これら3点を互いに突っ張ることにより強度をもたせた構成になっている。なお、16は植付昇降レバーを示す。   The seedling planting part 6 is mounted on the rear part of the vehicle body so as to be movable up and down via a lifting link mechanism 7 and is moved up and down by the expansion and contraction operation of the lifting hydraulic cylinder 8, and in this example, on the pulling side of the hydraulic cylinder 8. It is configured to raise the seedling planting part. The fulcrum Q1 of the elevating hydraulic cylinder 8 and the fulcrums Q2 and Q3 of the elevating link mechanism 7 are connected by a single plate 15, and these three points are stretched together to give strength. Reference numeral 16 denotes a planting lift lever.

また、この苗植付部6には、左右に往復動する苗載タンク11、1株分の苗を切取って土中に植込む植込杆12を有する2条分植付装置13,13、苗植付面を滑走しながら整地するフロ−ト(サイドフロ−ト)14,14、センタフロ−ト14S等を備えている。   In addition, the seedling planting unit 6 includes a two-row planting device 13 and 13 having a seedling tank 11 that reciprocates left and right, and a planting basket 12 that cuts out one seedling and transplants it into the soil. Further, there are provided floats (side floats) 14 and 14, a center float 14S and the like for leveling while sliding on the seedling planting surface.

エンジンEの回転動力は、エンジン出力プーリ20からベルト25を介して油圧式無段変速装置(HST)21の入力プ−リ22、入力軸23に伝えられ、この入力軸23からこれと同一軸芯上に設けられた伝動軸を介して油圧ポンプを駆動するようになっており、更に、HST21の出力軸からミッションケ−ス26のミッション入力軸に伝えられるようになっている。   The rotational power of the engine E is transmitted from the engine output pulley 20 to the input pulley 22 and the input shaft 23 of the hydraulic continuously variable transmission (HST) 21 via the belt 25. The hydraulic pump is driven via a transmission shaft provided on the core, and is further transmitted from the output shaft of the HST 21 to the mission input shaft of the mission case 26.

前記HST21は、フロントカバー10の下方に配置してあり、フロントカバー10の上部近傍には、該HSTを駆動する変速レバ−25が配置され、この変速レバ−25の前後方向の操作でHST21を駆動し機体の前進及び後進制御を司るように構成されている。   The HST 21 is disposed below the front cover 10, and a shift lever 25 that drives the HST is disposed near the top of the front cover 10, and the HST 21 is operated by operating the shift lever 25 in the front-rear direction. It is configured to drive and manage forward and backward control of the airframe.

後輪伝動ケース30は、後輪3の車軸31より前側の回動支点P回りに上下回動可能に構成している。図3に示すように、走行フレーム32には後輪伝動ケース30を下方に向けて回動付勢する圧縮スプリング34を設けてあり、通常の走行時には機体の自重で圧縮スプリング34が縮んで後輪3が上動状態となり、機体の前進で後輪3に所定以上の駆動負荷が生じたときにはその駆動反力により後輪伝動ケース30が下側へ回動して後輪3が下動状態となるよう構成している。   The rear wheel transmission case 30 is configured to be vertically rotatable around a rotation fulcrum P on the front side of the axle 31 of the rear wheel 3. As shown in FIG. 3, the travel frame 32 is provided with a compression spring 34 that urges the rear wheel transmission case 30 to turn downward, and the compression spring 34 contracts due to the weight of the aircraft during normal travel. When the wheel 3 is in an upward movement state and a driving load exceeding a predetermined value is generated on the rear wheel 3 due to the forward movement of the vehicle body, the rear wheel transmission case 30 is rotated downward by the driving reaction force, and the rear wheel 3 is in the downward movement state. It is constituted so that.

また、前記後輪伝動ケース30は、後輪車軸31を挟む位置で上下に分割して半割アッパーケース30aと半割ロワーケース30bとからなる構成としてあり、回動支点軸Pを半割ロワーケース30b側に設定すると共に、半割アッパーケース30a側には、独立スイングのストッパー部35を進行方向前側に設けた構成としている。   The rear wheel transmission case 30 is divided into upper and lower parts at a position sandwiching the rear wheel axle 31, and is composed of a half upper case 30a and a half lower case 30b. In addition to being set on the case 30b side, an independent swing stopper 35 is provided on the front side in the traveling direction on the half upper case 30a side.

なお、回動支点軸Pは、走行フレーム32から下方に突設するブラケット33に軸支してあり、且つ、後輪3の外径内に設定している。要するに、左右後輪の伝動ケース30は、圧縮スプリング34を介して回動支点軸P回りに左右独立的にスイングする構成であり、かかる構成によれば、回動支点軸Pとストッパー部35との間隔が大きく取れるため、ストッパー部の剛性を低くでき、軽量でコストダウンが可能となる。 The pivot fulcrum shaft P is pivotally supported by a bracket 33 projecting downward from the traveling frame 32 and is set within the outer diameter of the rear wheel 3. In short, the transmission case 30 for the left and right rear wheels is configured to swing independently on the left and right around the rotation fulcrum axis P via the compression spring 34. According to this configuration, the rotation fulcrum axis P, the stopper portion 35, and the like. Therefore, the stopper portion can be lowered in rigidity, and can be reduced in weight and cost.

また、図4に示す実施例では、前記図3と同様に後輪伝動ケースに回動支点を持つ後輪独立スイング構成において、後輪回動時の後輪伝動軸36におけるユニバーサルジョイント部36aのユニバーサル折れ角が大きくなるのを防ぐ為に、非回動時のユニバーサル折れ角を逆側に傾けるまでスイング最大時のユニバーサル折れ角の許容範囲内に納めるようにしている。   Further, in the embodiment shown in FIG. 4, in the rear wheel independent swing configuration in which the rear wheel transmission case has a rotation fulcrum as in FIG. 3, the universal joint portion 36a of the rear wheel transmission shaft 36 at the time of rear wheel rotation is universal. In order to prevent the bending angle from becoming large, the universal bending angle at the time of non-rotation is kept within the allowable range of the universal bending angle at the maximum swing until it is tilted to the opposite side.

直進高負荷時、駆動反力によって機体を自動的にヒップアップする構成にあって、ヒップアップ側の力に抵抗を加える圧縮スプリングを設けた構成において、その抵抗力を可変させることにより、ヒップアップする負荷を任意に変更可能にし、変速レバー切り替えによる機体「移動」(路上走行)時には抵抗をゼロにして後輪の接地性を高め、「植付作業」時には抵抗をかけて機体前部が浮き上がるような高負荷時のみヒップアップするように構成することで、駆動反力の小さい路上走行では抵抗を与えず、駆動反力の大きい圃場走行では必要以上にヒップアップしないように抵抗を与えることが可能となる。   In a configuration in which the aircraft is automatically hip-up by driving reaction force when driving straight and high load, and in a configuration with a compression spring that adds resistance to the force on the hip-up side, the resistance force can be varied to increase the hip-up The load to be changed can be arbitrarily changed, and the resistance of the rear wheel is made zero when the aircraft is “moving” (running on the road) by switching the shift lever to improve the grounding property of the rear wheel. By constructing to hip up only at such high loads, resistance is not given when driving on the road with a small driving reaction force, and resistance is given so that hips do not rise more than necessary when running on a field with a large driving reaction force. It becomes possible.

また、上記のような構成において、HSTを駆動する変速レバ−25の操作に起因する前後進低速時には、抵抗をゼロにして後輪の接地性を高め、中・高速時には抵抗をかけて機体前部が浮き上がるような高負荷時のみヒップアップするよう構成することもでき、駆動反力の小さい低速走行では抵抗を与えず、駆動反力の大きい高速走行では必要以上にヒップアップしないように抵抗を与えることが可能となる。   In the above configuration, when the vehicle is moving forward and backward due to the operation of the shift lever 25 that drives the HST, the resistance is reduced to zero to improve the grounding property of the rear wheel, and at the middle and high speeds, the resistance is applied. It can also be configured to hip up only when the load is high, such as when the part is lifted, and resistance is not given at low speed driving with a small driving reaction force, and resistance is not applied at high speed driving with a large driving reaction force. It becomes possible to give.

更に、エンジンEのスロットル低回転時には抵抗をゼロにして後輪の接地性を高め、中・高速時には抵抗をかけて機体前部が浮き上がるような高負荷時のみヒップアップするように構成することもできる。   In addition, the engine E can be configured so that the resistance is reduced to zero when the throttle is running at a low speed to improve the grounding performance of the rear wheels, and at mid and high speeds, the resistance is applied and the front part of the fuselage is lifted up only during high loads. it can.

図5に示す実施例では、半割アッパーケース30aの前側に設けたストッパー部35にクッションゴム37を設け、後進高負荷時にはクッションゴム37のたわみにより、機体を逆にヒップダウンさせて前下がり状態を緩和させ、前輪の沈み込みを防止する構成としている。これによれば、後進での畦越えやアユミ越えが容易にでき、走行抵抗の大きい湿田での後進性能が向上する。   In the embodiment shown in FIG. 5, a cushion rubber 37 is provided on the stopper portion 35 provided on the front side of the half upper case 30a. It is configured to reduce the front wheel and prevent the front wheels from sinking. According to this, it is possible to easily go over the ridge and Ayumi in the reverse direction, and the reverse performance in the wet field having a large running resistance is improved.

また、植付昇降レバー16の植付部上げ操作時には、抵抗をゼロにして後輪の接地性を高め、下げ操作時には抵抗をかけて機体前部が浮き上がるような高負荷時のみヒップアップするように構成することもでき、これによって駆動反力の小さい路上走行では抵抗を与えず、駆動反力の大きい圃場走行では必要以上にヒップアップしないように抵抗を与えて安定した走行が可能となる。   Also, when raising the planting part of the planting lifting lever 16, the resistance is reduced to zero to improve the grounding property of the rear wheel, and when lowering, the resistance is applied and the hips are lifted up only at high loads where the front part of the aircraft rises. In this way, it is possible to perform stable traveling by providing resistance so as not to hip up more than necessary when traveling on the field with a large driving reaction force without applying resistance when traveling on a road with a small driving reaction force.

直進高負荷時、駆動反力によって機体を自動的にヒップアップする上記構成において、ヒップアップ時、浅田での植付部最低高さ上昇による浮き苗を防ぐために、苗植付部6と昇降用油圧シリンダ8との間に装備したスイングスプリング40の伸縮量を規制することにより、植付部最低高さを低くするように構成することができる。つまり、スイングスプリング40は、図6に示すように、保持部材41aと41b間に介装してあり、螺子杆42と調整ナット43によって保持部材41a,41b間の間隔を拡縮変更しスプリング伸縮量を規制調整するようになっている。   In the above configuration that automatically hips up the aircraft by driving reaction force when driving straight and high, in order to prevent floating seedlings due to a rise in the minimum height of the planting part in Asada during hip up, By restricting the amount of expansion / contraction of the swing spring 40 provided between the hydraulic cylinder 8 and the hydraulic cylinder 8, the minimum height of the planting portion can be reduced. That is, as shown in FIG. 6, the swing spring 40 is interposed between the holding members 41 a and 41 b, and the distance between the holding members 41 a and 41 b is changed by the screw rod 42 and the adjustment nut 43 to expand and contract the spring. The regulation is to be adjusted.

図7に示す実施例は、直進高負荷時、駆動反力によって機体を自動的にヒップアップする構成において、ブレーキペダル44を踏み込むと、後輪伝動ケース30を後輪下げ位置で固定するロックピン45が作動するように連動構成し、運行時のハネ上がりを防止するようにしている。   The embodiment shown in FIG. 7 is a lock pin for fixing the rear wheel transmission case 30 in the rear wheel lowering position when the brake pedal 44 is depressed in a configuration in which the airframe is automatically hip-up by a driving reaction force when the vehicle is traveling straight and high. It is configured to be interlocked so that 45 can be operated, so that it is prevented from rising during operation.

図8及び図9に示す実施例は、リヤアクスル46内のリヤアクスル軸47上にサイドクラッチ48を設けた構成のものにおいて、後輪伝動ケース30には、リヤアクスル軸47から後輪車軸31までの減速伝動経路としてベベルギヤ伝動機構49が内装されてあり、そして、この後輪伝動ケース30は、前記リヤアクスル軸47を回動支点として左右独立的にスイング可能に構成され、直進高負荷時には、駆動反力により圧縮スプリング34を介して後輪伝動ケース30が下方へスイングして後輪が下動状態となって機体の後部が上昇するようになっている。   The embodiment shown in FIGS. 8 and 9 has a configuration in which a side clutch 48 is provided on a rear axle shaft 47 in the rear axle 46, and the rear wheel transmission case 30 has a deceleration from the rear axle shaft 47 to the rear wheel axle 31. A bevel gear transmission mechanism 49 is built in as a transmission path, and the rear wheel transmission case 30 is configured to be able to swing independently on the left and right sides with the rear axle shaft 47 as a rotation fulcrum. As a result, the rear wheel transmission case 30 swings downward via the compression spring 34 so that the rear wheel moves downward and the rear part of the airframe rises.

図10及び図11に示す実施例では、図8の実施例と同じように、後輪伝動ケース30がリヤアクスル軸47軸芯を支点としてスイングする構成であり、左右の後輪伝動ケース30,30間に設けたヒップアップ用油圧シリンダ50の伸縮作動によって左右の後輪を昇降駆動する構成としている。そして、機体前部に設けられた畦越え操作アーム51(図1、図2参照)を前方に倒すと、これに連動してヒップアップ用油圧シリンダ50を作動させ、後輪伝動ケース30のスイング、後輪3の下動により、機体をヒップアップするように構成している。これによれば、機体のヒップアップにより、機体の重心が前方に移動し、前上がりを防ぎ、畦越えの容易化を図ることができる。   In the embodiment shown in FIGS. 10 and 11, the rear wheel transmission case 30 swings around the rear axle shaft 47 axis as a fulcrum, as in the embodiment of FIG. 8, and the left and right rear wheel transmission cases 30, 30. The left and right rear wheels are driven to move up and down by an expansion and contraction operation of a hip-up hydraulic cylinder 50 provided therebetween. When the heel over manipulating arm 51 (see FIGS. 1 and 2) provided at the front of the machine body is tilted forward, the hip-up hydraulic cylinder 50 is operated in conjunction with this, and the rear wheel transmission case 30 swings. The airframe is configured to be hip-up by the downward movement of the rear wheel 3. According to this, the center of gravity of the fuselage moves forward by the hip-up of the fuselage, and it is possible to prevent the front from rising and to easily go over the heel.

また、図12に示す実施例は、左右の後輪3,3がリヤアクスル46の中央に設けられた前後方向の軸芯P1を回動支点として左右独立して上下動する構成であり、畦越え時に、畦越え操作アーム51を前方に倒すと、ヒップアップ用油圧シリンダ50の作動によって左右の後輪3,3を前後方向の軸芯P1回りに下動させて機体のヒップアップを図るようにしている。   In the embodiment shown in FIG. 12, the left and right rear wheels 3 and 3 move up and down independently from each other about the pivot axis P1 provided in the center of the rear axle 46 in the front-rear direction. When the heel over manipulating arm 51 is tilted forward, the hip-up hydraulic cylinder 50 is actuated to move the left and right rear wheels 3, 3 downward about the axis P1 in the front-rear direction so as to increase the hip of the aircraft. ing.

更に、図13に示す実施例では、左右に後輪3,3を備えたリヤアクスル46を左右に分割し、その分割された左右のリヤアクスル46L,46Rが前後方向の軸芯P2,P2を支点として独立的に上下動する構成であり、畦越え時には、畦越え操作アーム51を前方に倒すと、ヒップアップ用油圧シリンダ50の作動によって左右の後輪3,3を前後方向の二つの軸芯P2,P2を回動支点として下動させて機体の後部をリフトアップし、畦越えの容易化を図るようにしている。   Further, in the embodiment shown in FIG. 13, a rear axle 46 having rear wheels 3 and 3 on the left and right is divided into left and right, and the divided left and right rear axles 46L and 46R serve as fulcrums about axial centers P2 and P2 in the front-rear direction. It is configured to move up and down independently. When the heel crossing operation arm 51 is tilted forward when the heel is crossed, the left and right rear wheels 3 and 3 are moved to the two axial centers P2 in the front and rear directions by the operation of the hip-up hydraulic cylinder 50. , P2 is moved downward as a pivot, and the rear part of the aircraft is lifted up to facilitate overpass.

田植機の側面図Side view of rice transplanter 同上平面図Same as above 同上要部の側面図Side view of the main part 同上要部の側面図Side view of the main part 同上一部の側面図Side view of some of the above 植付部の昇降機構の側面図Side view of the lifting mechanism of the planting part ブレーキペダルと後輪伝動ケースとの関連構成を示す側面図Side view showing related configuration of brake pedal and rear wheel transmission case 後輪下動機構を示す平面図Plan view showing rear wheel lowering mechanism 同上要部の側面図Side view of the main part 後輪下動機構を示す背面図Rear view showing rear wheel lowering mechanism 同上要部の側面図Side view of the main part 別実施例の後輪下動機構背面図Rear view of rear wheel lowering mechanism in another embodiment 別実施例の後輪下動機構背面図Rear view of rear wheel lowering mechanism in another embodiment

符号の説明Explanation of symbols

回動支点軸:車体、前輪後輪、6:苗植付部、7:昇降リンク機構、16:植付昇降レバー、30後輪伝動ケース31後輪車軸34圧縮スプリング、37:クッションゴム P : Rotating fulcrum shaft , 1 : Vehicle body, 2 : Front wheel , 3 : Rear wheel , 6: Seedling planting part, 7: Lifting link mechanism, 16: Planting lifting lever, 30 : Rear wheel transmission case , 31 : Rear wheel axle, 34: compression spring, 37: cushion rubber

Claims (3)

前輪(2)及び後輪(3)を備える車体(1)の後方に昇降リンク機構(7)を介して苗植付部(6)を設け、後輪伝動ケース(30)を後輪車軸(31)より前側の回動支点(P)回りに上下回動可能に構成すると共に、後輪伝動ケース(30)を下方に回動付勢する圧縮スプリング(34)を設け、通常の走行時には機体の自重で圧縮スプリング(34)が縮んで後輪(3)が上動状態となり、機体の前進で後輪に所定以上の駆動負荷が生じたときにはその駆動反力により後輪伝動ケース(30)が下側へ回動して後輪(3)が下動状態となる構成とした乗用型田植機 A seedling planting portion (6) is provided via a lifting link mechanism (7) behind a vehicle body (1) having a front wheel (2) and a rear wheel (3), and a rear wheel transmission case (30) is attached to a rear wheel axle ( 31) It is configured to be rotatable up and down around a rotation fulcrum (P) on the front side from 31), and is provided with a compression spring (34) for urging the rear wheel transmission case (30) downward, and during normal travel, the airframe The compression spring (34) is contracted by its own weight and the rear wheel (3) is in an upward movement state, and when a driving load exceeding a predetermined value is generated on the rear wheel due to the forward movement of the fuselage, the driving reaction force causes the rear wheel transmission case (30). Is a riding type rice transplanter configured to rotate downward and the rear wheel (3) to move downward. 前輪(2)及び後輪(3)を備える車体(1)の後方に昇降リンク機構(7)を介して苗植付部(6)を設け、後輪伝動ケース(30)を後輪車軸(31)より前側の回動支点(P)回りに上下回動可能に構成すると共に、後輪伝動ケースを下方に回動付勢するクッションゴム(37)を設け、クッションゴム(37)のたわみにより後輪(3)が上動状態となる構成とした乗用型田植機。   A seedling planting portion (6) is provided via a lifting link mechanism (7) behind a vehicle body (1) having a front wheel (2) and a rear wheel (3), and a rear wheel transmission case (30) is attached to a rear wheel axle ( 31) A cushion rubber (37) that is configured to be pivotable up and down around the pivot point (P) on the front side of the front wheel and that urges the rear wheel transmission case to pivot downward is provided by the deflection of the cushion rubber (37). Riding type rice transplanter configured to move the rear wheel (3) upward. 植付昇降レバー(16)により苗植付部(6)を上げ操作すると、後輪伝動ケース(30)が下側へ回動して後輪(3)が下動状態となる構成とした請求項1又は2に記載の乗用型田植機。   When the seedling planting part (6) is operated to be raised by the planting lift lever (16), the rear wheel transmission case (30) is rotated downward and the rear wheel (3) is moved downward. Item 3. The riding type rice transplanter according to item 1 or 2.
JP2005182176A 2005-06-22 2005-06-22 Rear-wheel lowering device of rice-planting machine of riding-type Pending JP2007001380A (en)

Priority Applications (1)

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JP2005182176A JP2007001380A (en) 2005-06-22 2005-06-22 Rear-wheel lowering device of rice-planting machine of riding-type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005182176A JP2007001380A (en) 2005-06-22 2005-06-22 Rear-wheel lowering device of rice-planting machine of riding-type

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JP2007001380A JP2007001380A (en) 2007-01-11
JP2007001380A5 true JP2007001380A5 (en) 2008-01-24

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JP4807408B2 (en) * 2008-12-26 2011-11-02 井関農機株式会社 Riding work machine

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