JP6610877B2 - PTO axis control device for work vehicle - Google Patents
PTO axis control device for work vehicle Download PDFInfo
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- JP6610877B2 JP6610877B2 JP2015222753A JP2015222753A JP6610877B2 JP 6610877 B2 JP6610877 B2 JP 6610877B2 JP 2015222753 A JP2015222753 A JP 2015222753A JP 2015222753 A JP2015222753 A JP 2015222753A JP 6610877 B2 JP6610877 B2 JP 6610877B2
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本発明はトラクタのように作業機を連結する作業車両のＰＴＯ軸制御装置に関する。 The present invention relates to a PTO shaft control device for a work vehicle that connects work machines like a tractor.
トラクタは車両後部に耕耘機のような作業機を連結し、車両側の動力源で作業機を駆動する。動力の伝達は車両側のＰＴＯ軸を介して行う。ＰＴＯ軸は作業機の種類や駆動力の相違により形状などが規格化されていて、通常は少なくも２種類のＰＴＯ軸を使い分けている。それらを便宜的にＡ，Ｂと呼ぶと、ＡのＰＴＯ軸はたとえば毎分540回転用で、ＢのＰＴＯ軸は毎分1000回転用である。従って、これらＡ，Ｂは変速域が違う。Ａの変速域は低速で、Ｂの変速域は高速で使用する。
Ａに合った変速域とＢに合った変速域の切替は、車両側のＰＴＯ駆動機構のＰＴＯ変速機構を操作して行う。ＰＴＯ変速機構の操作は操作レバーを手で動かして行う。操作レバーを動かす際、ＰＴＯ軸がＡのときにＢの変速域にならないように、またＢのときにＡの変速域にならないように、するには、使用中のＰＴＯ軸がＡかＢかにより操作レバーの可動範囲を規制すれば実現できる。
The tractor connects a work machine such as a tiller to the rear part of the vehicle, and drives the work machine with a power source on the vehicle side. Power is transmitted through the PTO shaft on the vehicle side. The shape of the PTO shaft is standardized depending on the type of working machine and the driving force, and usually at least two types of PTO shafts are used properly. If they are called A and B for convenience, the PTO axis of A is for 540 revolutions per minute, for example, and the PTO axis of B is for 1000 revolutions per minute. Therefore, these A and B have different shift ranges. The shift range of A is used at a low speed, and the shift range of B is used at a high speed.
Switching between the speed range suitable for A and the speed range suitable for B is performed by operating the PTO speed change mechanism of the PTO drive mechanism on the vehicle side. The PTO speed change mechanism is operated by manually moving the operation lever. To move the control lever so that it does not fall within the B shift range when the PTO axis is A, and to avoid the A shift range when the PTO axis is B, the PTO shaft being used is A or B. This can be realized by restricting the movable range of the operation lever.
このような考えに基づいて、操作レバーの可動範囲を規制したものが知られている（たとえば特許文献１）。特許文献１では、使用中のＰＴＯ軸がＢのときにはＢの変速域になるように機械的に操作レバーの可動範囲を規制する。機械的に一律に操作レバーの可動範囲を規制すれば、ＰＴＯ軸がＢ（高速）のときに間違ってＡ（低速）の変速域にするのを回避できる。
特許文献１の仕組みは、使用しない方のＰＴＯ軸を仕舞っておく専用の軸ケースを設け、この軸ケースに収容しているＰＴＯ軸すなわち使用しない方のＰＴＯ軸から、使用している方のＰＴＯ軸の種類に対応するようにＰＴＯ変速機構の操作レバーの可動範囲を規制する構成である。具体的には、ＰＴＯ変速操作レバーに固定したストッパにカム部材を接触させたり離間したりして操作レバーの可動範囲を規制する。カム部材の移動は軸ケース内のＰＴＯ軸でカム部材を作動ばねに抗して押したり押さなかったりして行う。
例えば、軸ケースに収容したＰＴＯ軸がＡであれば、Ａによりカム部材を押してストッパにカム部材を接触させ、これにより、使用している方のＢに対応するようにＰＴＯ変速操作レバーの可動範囲を規制する。逆に、軸ケースに収容したＰＴＯ軸がＢであれば、Ｂはカム部材に当らないようになっていて、そのことでストッパとカム部材を離間させ、使用している方のＡに対応するようにＰＴＯ変速操作レバーの可動範囲を規制する。
Based on such an idea, a device in which the movable range of the operation lever is regulated is known (for example, Patent Document 1). In Patent Document 1, when the PTO shaft in use is B, the movable range of the operation lever is mechanically restricted so that the shift range is B. By restricting the movable range of the operation lever uniformly mechanically, it is possible to avoid erroneously setting the A (low speed) shift range when the PTO shaft is at B (high speed).
The mechanism of Patent Document 1 is provided with a dedicated shaft case for closing a PTO shaft that is not used, and the PTO shaft that is used, from the PTO shaft that is accommodated in this shaft case, that is, the PTO shaft that is not used. In this configuration, the movable range of the operation lever of the PTO transmission mechanism is regulated so as to correspond to the type of shaft. Specifically, the movable range of the operation lever is restricted by bringing the cam member into contact with or separating from a stopper fixed to the PTO speed change operation lever. The movement of the cam member is performed by pushing or not pushing the cam member against the operating spring by the PTO shaft in the shaft case.
For example, if the PTO shaft accommodated in the shaft case is A, the cam member is pushed by A to bring the cam member into contact with the stopper, and thereby the PTO speed change operation lever can be moved so as to correspond to the used B. Regulate the range. On the other hand, if the PTO shaft accommodated in the shaft case is B, B will not hit the cam member, so that the stopper and the cam member are separated from each other, which corresponds to A in use. In this way, the movable range of the PTO speed change operation lever is restricted.
このように特許文献１によるレバーの可動範囲の規制は、機械的な仕組みにより行う。そのために、カム部材などの可動部材を要し部品点数も多く製造コストが嵩むばかりでなく、カム部材の軸が錆びたり異物が絡んだりすると作動バネが働かなくなりカム部材の動きに支障が出るなど、耐久性や確実性に改善すべき問題点があった。 Thus, the restriction | limiting of the movable range of the lever by patent document 1 is performed by a mechanical mechanism. For this reason, a movable member such as a cam member is required, which not only increases the number of parts but also increases the manufacturing cost. There was a problem that should be improved in durability and reliability.
本発明はこのような問題点を解決するものである。そのため従来と違いＰＴＯ変速操作レバーの動きを規制せずフリーにする。すなわちレバーは使用している方のＰＴＯ軸の種類に関係なく同じ範囲を動くようにし、ＰＴＯ変速機構の操作は、レバーの位置データ（レバーを引いたか押したか）と使用中のＰＴＯ軸の種類データ（ＡかＢか）の組合せから行う。このことで部品点数を減らし全体的な構造を簡素化すると共に、変速域の切替精度や作業性を向上するのが、本発明の目的である。 The present invention solves such problems. Therefore, unlike the conventional case, the movement of the PTO shift operation lever is not restricted and is made free. In other words, the lever moves within the same range regardless of the type of PTO shaft being used, and the operation of the PTO transmission mechanism depends on the lever position data (whether the lever is pulled or pushed) and the type of PTO shaft being used. This is done from a combination of data (A or B). Accordingly, it is an object of the present invention to reduce the number of parts, simplify the overall structure, and improve the shift range switching accuracy and workability.
この目的達成のため、請求項１の作業車両のＰＴＯ軸制御装置においては、作業車両の機体後部に作業機を連結し、作業機側に作業車両側の回転動力を伝動するための回転数の異なるＰＴＯ軸をA、B2本用意し、AかBのＰＴＯ軸を作業車両のトランスミッションに装着し、使用しないＢかAのＰＴＯ軸を作業車両に備える軸ケースに格納し、軸ケースには格納したＰＴＯ軸がBのときオンでAのときオフとなる軸判別スイッチを設け、
また作業車両には、ＰＴＯ軸の回転と停止を手動で操作するＰＴＯスイッチと、トランスミッションのＰＴＯ変速機構を操作するＰＴＯ変速操作レバーと、トランスミッションのＰＴＯ動力を断続する油圧クラッチと、をそれぞれ設けると共に、
前記ＰＴＯスイッチ、前記ＰＴＯ変速操作レバーの位置を検出するレバー位置検出スイッチ、及び、前記軸判別スイッチを、ＰＴＯ制御部の入力側に、また、前記油圧クラッチの入り切りを行う比例ソレノイドバルブを、ＰＴＯ制御部の出力側に、それぞれ接続し、
そして、軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、ＰＴＯスイッチをオンにするとＰＴＯ軸が回転し、
他方、軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、ＰＴＯスイッチをオンにしてもＰＴＯ軸が回転しない、ように比例ソレノイドバルブを操作して前記油圧クラッチの入り切りを行ってＰＴＯ動力の断続を制御する。
In order to achieve this object, in the PTO shaft control apparatus for a work vehicle according to claim 1, the work machine is connected to the rear part of the machine body of the work vehicle, and the rotational speed for transmitting the work vehicle side rotational power to the work machine side is set. Prepare two different PTO shafts A and B, install the A or B PTO shaft on the transmission of the work vehicle, store the unused B or A PTO shaft in the shaft case provided on the work vehicle, and store it in the shaft case. An axis discrimination switch that is on when the PTO axis is B and off when it is A is provided.
The work vehicle is provided with a PTO switch for manually operating rotation and stop of the PTO shaft, a PTO shift operation lever for operating the PTO transmission mechanism of the transmission, and a hydraulic clutch for intermittently connecting the PTO power of the transmission. ,
The PTO switch, a lever position detection switch for detecting the position of the PTO shift operation lever, and the shaft discrimination switch are provided on the input side of the PTO control unit, and a proportional solenoid valve for turning on / off the hydraulic clutch is provided. Connect to the output side of the control unit,
When the axis discrimination switch is on and the lever position detection switch is off on the PTO shift operation lever A side, or the axis discrimination switch is off and the lever position detection switch is on on the PTO shift operation lever B side. When the PTO switch is turned on, the PTO shaft rotates,
On the other hand, when the axis discrimination switch is on and the lever position detection switch is on on the PTO shift operation lever B side, or the axis discrimination switch is off and the lever position detection switch is off on the PTO shift operation lever A side. At this time, the hydraulic clutch is turned on and off by controlling the proportional solenoid valve so that the PTO shaft does not rotate even if the PTO switch is turned on, thereby controlling the PTO power intermittently.
さらに、前記ＰＴＯスイッチをオンにしてもＰＴＯ軸が回転しない場合は、前記軸判別スイッチがオンからオフにまたはオフからオンに変化しても油圧クラッチ切りを維持することを特徴とする。 Further , if the PTO shaft does not rotate even when the PTO switch is turned on, the hydraulic clutch disengagement is maintained even if the shaft discrimination switch changes from on to off or from off to on.
また、請求項２の作業車両のＰＴＯ軸制御装置においては、前記ＰＴＯスイッチをオンにしてＰＴＯ軸が回転している場合は、前記軸判別スイッチがオンからオフにまたはオフからオンに変化したら、油圧クラッチを切りにしＰＴＯ軸の回転を停止することを特徴とする。 In the PTO shaft control device for a work vehicle according to claim 2 , when the PTO shaft is rotating with the PTO switch turned on, when the shaft discrimination switch changes from on to off or from off to on, The hydraulic clutch is disengaged and the rotation of the PTO shaft is stopped.
請求項１の発明によれば、ミッションに装着されているＰＴＯ軸とＰＴＯ変速操作レバーの位置を検出するレバー位置検出スイッチの組合せにより、使用するＰＴＯ軸の回転数と違う位置にＰＴＯ変速操作レバーを動かした場合には、操縦席のＰＴＯスイッチをオンにしてもＰＴＯ軸は回転しない。このため装着されているＰＴＯ軸に適した回転数でＰＴＯ軸を回転させることができる。 According to the first aspect of the present invention, the combination of the PTO shaft mounted on the mission and the lever position detection switch for detecting the position of the PTO transmission operation lever allows the PTO transmission operation lever to be moved to a position different from the rotational speed of the PTO shaft used Is moved, the PTO shaft does not rotate even when the PTO switch on the cockpit is turned on. Therefore, the PTO shaft can be rotated at a rotation speed suitable for the mounted PTO shaft.
さらに、一旦、ＰＴＯ軸を回転させない条件が成立したら、その後は軸判別スイッチの判別結果を無視する。このことで、停止していたＰＴＯ軸が不用意に回転し始めないようにし、安全性を向上する。 Furthermore , once the condition for not rotating the PTO shaft is satisfied, the determination result of the axis determination switch is ignored thereafter. As a result, the stopped PTO shaft is prevented from inadvertently rotating, and safety is improved.
請求項２の発明によれば、一旦、ＰＴＯ軸が回転し始めても、ＰＴＯ軸を回転させない条件が成立したらＰＴＯ軸の回転を停止させるので、安全性が向上する。 According to the second aspect of the present invention, even if the PTO shaft starts to rotate, if the condition for not rotating the PTO shaft is satisfied, the rotation of the PTO shaft is stopped, so that safety is improved.
本発明の実施形態を図に従って説明する。
１は作業車両のトラクタで、２は作業機の耕耘機である。図１では省略したが、耕耘機２はロアリンクやトップリンクのような連結装置によりトラクタ１に連結されている。トラクタ１には動力源としてエンジンＥ（図８）が搭載されていて、その回転動力をＰＴＯ軸３から耕耘機２に伝達するほか、トラクタ１の車輪に伝えトラクタ１を推進する。
Embodiments of the present invention will be described with reference to the drawings.
1 is a tractor of a work vehicle, 2 is a cultivator of a work machine. Although omitted in FIG. 1, the cultivator 2 is connected to the tractor 1 by a connecting device such as a lower link or a top link. The tractor 1 is equipped with an engine E (FIG. 8) as a power source. The rotational power is transmitted from the PTO shaft 3 to the cultivator 2 and is transmitted to the wheels of the tractor 1 to propel the tractor 1.
ＰＴＯ軸３はＡ、Ｂの２種類あり、Ａを図２に、Ｂを図３に示す。これらは国際標準化機構ISOにより規格化された形状で、ともに中央に大径部４を有し、耕耘機２側に結合する先端部５にＡとＢで違う構造のスプラインが形成されている。規格により回転数がＡは高速用で、Ｂは低速用である。Ａ、Ｂの寸法は、大径部４から先端側（図中右側）の長さが同じで、大径部４から基端側（図中左側）の長さが違う。ＢがＡより寸法Ｄだけ長い。 There are two types of PTO shafts A and B. A is shown in FIG. 2 and B is shown in FIG. These are shapes standardized by the International Organization for Standardization ISO, both having a large-diameter portion 4 at the center, and splines having different structures A and B are formed at the tip portion 5 coupled to the cultivator 2 side. According to the standard, the rotational speed A is for high speed and B is for low speed. Regarding the dimensions of A and B, the length from the large diameter portion 4 to the distal end side (right side in the figure) is the same, and the length from the large diameter portion 4 to the proximal end side (left side in the figure) is different. B is longer than A by dimension D.
ＰＴＯ軸３は、その基端側を、トラクタ１の後背部のＰＴＯ駆動ギア６のボス部７に差し込んでスプライン嵌合する。図４の符号８は円環の一部に切欠きを有する着脱リングで、切欠きを撓めてその間隔を狭めて径を縮小する。そしてこれを大径部４の外側に当てた状態で撓みを解き、切欠きの間隔を復原して径を拡大する。このことによりＰＴＯ軸３が抜け落ちないようにトラクタ１に対し交換可能に取り付ける。図４はＰＴＯ軸３のうちＡが取り付いている状態を示す。 The base end side of the PTO shaft 3 is inserted into the boss portion 7 of the PTO drive gear 6 at the back of the tractor 1 and is spline-fitted. Reference numeral 8 in FIG. 4 is an attachment / detachment ring having a notch in a part of the ring, and the notch is bent to narrow the interval to reduce the diameter. Then, in a state where this is applied to the outside of the large diameter portion 4, the bending is released, and the diameter is expanded by restoring the notch interval. As a result, the PTO shaft 3 is attached to the tractor 1 so as to be exchanged so as not to fall off. FIG. 4 shows a state where A is attached to the PTO shaft 3.
ＰＴＯ駆動ギア６はエンジンＥの動力で回転するが、エンジンEとギア６の間に位置するトランスミッションは公知で、それを図5の符号９で示す。このトランスミッション９は、図8に示すように、ＰＴＯクラッチ機構１０とＰＴＯ変速機構１１を含んで構成されている。
ＰＴＯクラッチ機構１０は比例ソレノイドバルブ１２により入り切りする油圧クラッチ１３を有し、エンジンＥの動力をＰＴＯ変速機構１１に対し断続可能に伝達する。
ＰＴＯ変速機構１１はＰＴＯ駆動ギア６を介しＰＴＯ軸３を高速または低速に変速可能に回転する。変速操作はトランスミッション９のケースの外側に設けたＰＴＯ変速操作レバー１４を手で動かして行う。
Although the PTO drive gear 6 is rotated by the power of the engine E, a transmission located between the engine E and the gear 6 is known and is denoted by reference numeral 9 in FIG. As shown in FIG. 8, the transmission 9 includes a PTO clutch mechanism 10 and a PTO transmission mechanism 11.
The PTO clutch mechanism 10 has a hydraulic clutch 13 that is turned on and off by a proportional solenoid valve 12 and transmits the power of the engine E to the PTO transmission mechanism 11 in an intermittent manner.
The PTO transmission mechanism 11 rotates the PTO shaft 3 via the PTO drive gear 6 so that the PTO shaft 3 can be changed at high speed or low speed. The speed change operation is performed by manually moving a PTO speed change operation lever 14 provided outside the case of the transmission 9.
ＰＴＯ変速操作レバー１４は先端がシフターアーム１５を介して回軸１６に連結し（図5）、手元側の把手部１７を握ってＰＴＯ変速操作レバー１４を長さ方向に引いたり戻したりして回軸１６を中心にシフターアーム１５の角度を変える。このことでＰＴＯ変速機構１１のシフター（図示略）が動いてギアを高速側か低速側かに切り替え、ＰＴＯ軸３の回転数を高速または低速に変速する。図5の例ではレバー１４を図中右側に引くと高速で、左側に押し戻すと低速に切り替わる。その中間位置はニュートラルである。レバー１４の手元側は位置不動の筒部材１８に挿通してガイドする。 The tip of the PTO speed change operation lever 14 is connected to the rotary shaft 16 via the shifter arm 15 (FIG. 5), and the PTO speed change operation lever 14 is pulled or returned in the length direction by grasping the handle portion 17 on the hand side. The angle of the shifter arm 15 is changed around the rotation axis 16. As a result, a shifter (not shown) of the PTO transmission mechanism 11 moves to switch the gear between the high speed side and the low speed side, and the rotational speed of the PTO shaft 3 is changed to high speed or low speed. In the example of FIG. 5, the lever 14 is switched to the high speed when pulled to the right side in the figure and switched to the low speed when pushed back to the left side. Its intermediate position is neutral. The proximal side of the lever 14 is inserted through a cylindrical member 18 that does not move and is guided.
シフターアーム１５の先端にピン１９を起立し、これをレバー位置検出スイッチ２０の操作片２１の可動域にのぞませる。ＰＴＯ変速操作レバー１４を低速側に動かすと、ピン１９が操作片２１を押しスイッチ２０は信号Lを出し、レバー１４をニュートラルか高速側に動かすと、ピン１９が操作片２１から離れスイッチ２０が信号Hを出す。このようにレバー位置検出スイッチ２０はＰＴＯ変速操作レバー１４の位置に応じた信号を出力する。 A pin 19 is erected at the tip of the shifter arm 15, and this is moved over the movable range of the operation piece 21 of the lever position detection switch 20. When the PTO speed change operation lever 14 is moved to the low speed side, the pin 19 pushes the operation piece 21 and the switch 20 outputs a signal L. When the lever 14 is moved to the neutral or high speed side, the pin 19 is separated from the operation piece 21 and the switch 20 is moved. Output signal H. Thus, the lever position detection switch 20 outputs a signal corresponding to the position of the PTO speed change operation lever 14.
２２は使用していない方のＰＴＯ軸３を格納する軸ケースで、トランスミッション９のケース外側に底部を低く傾斜して設置し、上向きの開口部よりＰＴＯ軸３の基端側を先にして入れて蓋２３を閉める（図６）。
軸ケース２２の内側には環状の段部２４が形成されていて、これにＰＴＯ軸３の大径部４を接触させ、蓋２３と段部２４の間で挟むようにＰＴＯ軸３を安定的に保持する。
Reference numeral 22 denotes a shaft case for storing the PTO shaft 3 which is not used. The shaft case is installed on the outside of the case of the transmission 9 with the bottom inclined at a low angle, and the base end side of the PTO shaft 3 is inserted first from the upward opening. Then, the lid 23 is closed (FIG. 6).
An annular step portion 24 is formed inside the shaft case 22, and the large diameter portion 4 of the PTO shaft 3 is brought into contact therewith so that the PTO shaft 3 can be stably held between the lid 23 and the step portion 24. Hold on.
軸ケース２２の底部の外側には軸判別スイッチ２５を取り付け、その操作片２６を軸ケース２２の底部に開けたスリット２７を通して軸ケース２２の内部に突出させる（図７）。
軸ケース２２内のＰＴＯ軸３が長い場合、すなわち使用しない方のＰＴＯ軸３がBで使用する方がAの場合、図６のように、ＰＴＯ軸３の基端が軸ケース２２の底部に達し、操作片２６を押して軸判別スイッチ２５は信号Lを出力する。
逆に、軸ケース２２内のＰＴＯ軸３が短い場合、すなわち使用しない方のＰＴＯ軸３がAで使用する方がBの場合、ＰＴＯ軸３の基端が軸ケース２２の底部に届かず操作片２６に接触しない。この場合は、軸判別スイッチ２５は信号Hを出力する。
A shaft discriminating switch 25 is attached to the outside of the bottom of the shaft case 22, and the operation piece 26 is projected into the shaft case 22 through a slit 27 opened in the bottom of the shaft case 22 (FIG. 7).
When the PTO shaft 3 in the shaft case 22 is long, that is, when the unused PTO shaft 3 is B, the base end of the PTO shaft 3 is at the bottom of the shaft case 22 as shown in FIG. When the operation piece 26 is reached, the axis discrimination switch 25 outputs a signal L.
On the other hand, when the PTO shaft 3 in the shaft case 22 is short, that is, when the unused PTO shaft 3 is used at A, the base end of the PTO shaft 3 does not reach the bottom of the shaft case 22 and is operated. It does not touch the piece 26. In this case, the axis discrimination switch 25 outputs a signal H.
図１０の別の実施態様では、軸判別スイッチとして２個の接点２８，２８を軸ケース２２の底部内側に離して設け、ＰＴＯ軸３の基端が接触することで２個の接点を閉じAかBかを判別する。Bであれば接点２８，２８を閉じ、Aであれば閉じない。図１０の実施態様ではスリット２７がなく、軸ケース２２の内部を外部と遮断して密閉できるので、軸ケース内部に塵埃や雨水などが侵入する恐れがない。
さらに別の実施態様として、軸判別スイッチを光学式センサまたは近接スイッチのような非接触式のスイッチ（図示省略）で構成してもよい。光学式センサの場合、軸ケース底部に発光器と受光器を相対して設置し、底部に届いたＰＴＯ軸の基端で光を遮断することによりAかBかを判別する。非接触式の場合、接点の摩耗がなく耐久性が良好である。
In another embodiment of FIG. 10, two contact points 28 and 28 are provided as shaft discrimination switches apart from the inside of the bottom of the shaft case 22, and the two contact points are closed when the base end of the PTO shaft 3 comes into contact. Or B. If B, contacts 28 and 28 are closed, and if A, they are not closed. In the embodiment of FIG. 10, there is no slit 27, and the inside of the shaft case 22 can be sealed off from the outside, so that there is no possibility that dust, rainwater, etc. enter the inside of the shaft case.
As yet another embodiment, the axis discrimination switch may be constituted by a non-contact switch (not shown) such as an optical sensor or a proximity switch. In the case of an optical sensor, a light emitter and a light receiver are placed opposite to each other at the bottom of the shaft case, and light is blocked at the base end of the PTO shaft reaching the bottom to determine whether it is A or B. In the case of the non-contact type, there is no wear of the contact point and durability is good.
図８の符号２９はＰＴＯ制御部で、その入力側に、レバー位置検出スイッチ２０、及び軸判別スイッチ２５と共にＰＴＯスイッチ３０を接続する。ＰＴＯスイッチ３０は他の操作機器と共にトラクタ１の運転台に配備され、運転する作業者が手動で入り切りする。ＰＴＯスイッチ３０はスイッチ入りで信号Lを出力し、スイッチ切りで信号Hを出力する。
ＰＴＯ制御部２９の出力側には比例ソレノイドバルブ１２を接続し、入力側の信号HかLの組合せに応じて比例ソレノイドバルブ１２をオンかオフする。
Reference numeral 29 in FIG. 8 denotes a PTO control unit, and a PTO switch 30 is connected to the input side together with the lever position detection switch 20 and the axis discrimination switch 25. The PTO switch 30 is provided in the cab of the tractor 1 together with other operating devices, and is manually turned on and off by a driving operator. The PTO switch 30 outputs a signal L when the switch is turned on, and outputs a signal H when the switch is turned off.
The proportional solenoid valve 12 is connected to the output side of the PTO control unit 29, and the proportional solenoid valve 12 is turned on or off according to the combination of the signal H or L on the input side.
次に、これら入力側の信号の組合せと出力側のオンかオフかの関係を、図９のケース１〜８ごとに順に説明する。
ケース１：ＰＴＯスイッチ３０が切りで信号H、
ＰＴＯ変速操作レバー１４がニュートラルか高速1000rpmで
レバー位置検出スイッチ２０が信号H、
使用中のＰＴＯ軸３がB（ケース２２内はA）で軸判別スイッチ２５が信号H、
このとき比例ソレノイドバルブ１２への出力はオフ
ケース２：ＰＴＯスイッチ３０が切りで信号H、
レバー位置検出スイッチ２０が信号H、
使用中のＰＴＯ軸３がA（ケース２２内はB）で軸判別スイッチ２５が信号L、
このときバルブ１２への出力はオフ
ケース３：ＰＴＯスイッチ３０が切りで信号H、
ＰＴＯ変速操作レバー１４が低速540 rpmでレバー位置検出スイッチ２０が信号L、
使用中のＰＴＯ軸３がB（ケース２２内はA）で軸判別スイッチ２５が信号H、
このときバルブ１２への出力はオフ
ケース４：ＰＴＯスイッチ３０が切りで信号H、
レバー位置検出スイッチ２０が信号L、
使用中のＰＴＯ軸３がA（ケース２２内はB）で軸判別スイッチ２５が信号L、
このときバルブ１２への出力はオフ
ケース５：ＰＴＯスイッチ３０が入りで信号L、
レバー位置検出スイッチ２０が信号H、
使用中のＰＴＯ軸３がB（ケース２２内はA）で軸判別スイッチ２５が信号H、
このときバルブ１２への出力はオフ
ケース６：ＰＴＯスイッチ３０が入りで信号L、
レバー位置検出スイッチ２０が信号H、
使用中のＰＴＯ軸３がA（ケース２２内はB）で軸判別スイッチ２５が信号L、
このときバルブ１２への出力はオン
ケース７：ＰＴＯスイッチ３０が入りで信号L、
レバー位置検出スイッチ２０が信号L、
使用中のＰＴＯ軸３がB（ケース２２内はA）で軸判別スイッチ２５が信号H、
このときバルブ１２への出力はオン
ケース８：ＰＴＯスイッチ３０が入りで信号L、
レバー位置検出スイッチ２０が信号L、
使用中のＰＴＯ軸３がA（ケース２２内はB）で軸判別スイッチ２５が信号L、
このときバルブ１２への出力はオフ
Next, the relationship between the combination of signals on the input side and whether the output side is on or off will be described in order for each of cases 1 to 8 in FIG.
Case 1: Signal H when PTO switch 30 is turned off
PTO speed change lever 14 is neutral or high speed 1000rpm
Lever position detection switch 20 is signal H,
The PTO shaft 3 in use is B (A in the case 22) and the axis discrimination switch 25 is a signal H.
At this time, the output to the proportional solenoid valve 12 is off-case 2: the signal H, when the PTO switch 30 is turned off.
Lever position detection switch 20 is signal H,
The PTO shaft 3 in use is A (B in the case 22) and the axis discrimination switch 25 is a signal L,
At this time, the output to the valve 12 is off-case 3: signal H, when the PTO switch 30 is turned off.
The PTO speed change lever 14 is at a low speed of 540 rpm and the lever position detection switch 20 is at a signal L.
The PTO shaft 3 in use is B (A in the case 22) and the axis discrimination switch 25 is a signal H.
At this time, the output to the valve 12 is off-case 4: the signal H when the PTO switch 30 is turned off,
Lever position detection switch 20 is signal L,
The PTO shaft 3 in use is A (B in the case 22) and the axis discrimination switch 25 is a signal L,
At this time, the output to the valve 12 is off-case 5: the PTO switch 30 is turned on and the signal L,
Lever position detection switch 20 is signal H,
The PTO shaft 3 in use is B (A in the case 22) and the axis discrimination switch 25 is a signal H.
At this time, the output to the valve 12 is off-case 6: the PTO switch 30 is turned on and the signal L,
Lever position detection switch 20 is signal H,
The PTO shaft 3 in use is A (B in the case 22) and the axis discrimination switch 25 is a signal L,
At this time, the output to the valve 12 is on-case 7: the PTO switch 30 is turned on and the signal L,
Lever position detection switch 20 is signal L,
The PTO shaft 3 in use is B (A in the case 22) and the axis discrimination switch 25 is a signal H.
At this time, the output to the valve 12 is on-case 8: the PTO switch 30 is turned on and the signal L,
Lever position detection switch 20 is signal L,
The PTO shaft 3 in use is A (B in the case 22) and the axis discrimination switch 25 is a signal L,
At this time, the output to the valve 12 is off.
これをまとめると、ＰＴＯスイッチ３０が切りのときは、ケース１〜４のとおり、ＰＴＯ変速操作レバー１４の位置や軸ケース内のＰＴＯ軸の種類に関係なく、ＰＴＯ制御部２９の出力はオフで、ＰＴＯクラッチ機構１０のクラッチが切りとなり、ＰＴＯ軸３は回動しない。
一方、ＰＴＯスイッチ３０を入りにすると、Aを使用している場合は、ケース６のとおり、レバー１４が高速ならバルブ１２への出力がオンでＰＴＯ軸３は回転するが、レバー１４が低速なら、ケース８のとおり、ＰＴＯ軸３は回転しない。
またＢを使用している場合は、ケース７のとおり、レバー１４が低速ならバルブ１２への出力がオンでＰＴＯ軸３は回転するが、レバー１４が高速なら、ケース５のとおり、ＰＴＯ軸３は回転しない。
このようにＢを使用している場合は専ら低速で高速にはならない。機械式ではＡを使用している場合に低速にしないのが規制の限界で、Ｂを使用している場合はレバーの可動範囲の規制が複雑すぎて規制の実現ができなかったが、本発明によればＰＴＯ制御部により簡単にできるという効果がある。
図９の説明においては、ＰＴＯSW30、レバー位置検出SW20、軸判別SW25のそれぞれの信号について、信号Ｌの出力、信号Ｈの出力としたが、信号Ｌの部分をオンとし、信号Ｈの部分をオフとしてもよい。
In summary, when the PTO switch 30 is off, the output of the PTO control unit 29 is off regardless of the position of the PTO speed change lever 14 and the type of the PTO shaft in the shaft case, as in cases 1 to 4. The clutch of the PTO clutch mechanism 10 is disengaged and the PTO shaft 3 does not rotate.
On the other hand, when the PTO switch 30 is turned on, when A is used, as in the case 6, if the lever 14 is at a high speed, the output to the valve 12 is on and the PTO shaft 3 rotates, but if the lever 14 is at a low speed. As in case 8, the PTO shaft 3 does not rotate.
When B is used, as in case 7, if the lever 14 is at a low speed, the output to the valve 12 is turned on and the PTO shaft 3 rotates, but if the lever 14 is at a high speed, the PTO shaft 3 as in case 5. Does not rotate.
Thus, when B is used, it is not low speed at high speed exclusively. In the mechanical type, when the A is used, it is the limit of the restriction that the speed is not low. When the B is used, the restriction of the movable range of the lever is too complicated to realize the restriction. According to the above, there is an effect that it can be easily performed by the PTO control unit.
In the description of FIG. 9, the signal L and the signal H are output for the PTO SW 30, the lever position detection SW 20, and the axis discrimination SW 25, but the signal L portion is turned on and the signal H portion is turned off. It is good.
ところでケース５のようにＰＴＯスイッチ３０をオンにしてもＰＴＯ軸３が回転しない場合は、途中で軸判別スイッチ２５がHからLに変化しても、油圧クラッチ切りを維持する。同様に、ケース８においてバルブ１２への出力がオフからオンに変わっても、油圧クラッチは切りを維持する。
このようにＰＴＯ軸３を回転させない条件が一旦成立し、ＰＴＯ軸３が停止した状態のときは、軸判別スイッチ２５の判別結果を無視することで、停止していたＰＴＯ軸３が不用意に回転するのを防ぎ、これにより安全を図る。
If the PTO shaft 3 does not rotate even when the PTO switch 30 is turned on as in the case 5, the hydraulic clutch disengagement is maintained even if the axis discrimination switch 25 changes from H to L midway. Similarly, even if the output to the valve 12 is changed from OFF to ON in the case 8, the hydraulic clutch is kept disengaged.
Thus, when the condition for not rotating the PTO shaft 3 is once established and the PTO shaft 3 is in a stopped state, the stopped PTO shaft 3 is inadvertently ignored by ignoring the determination result of the axis determination switch 25. Prevents rotation, thereby ensuring safety.
さらにケース６、７のように、ＰＴＯスイッチ３０オンでＰＴＯ軸が回転している場合は、軸判別スイッチ２５がLからHにまたはHからLに変化したら、油圧クラッチ１３を切りにし、ＰＴＯ軸３の回転を停止する。このように、一旦、ＰＴＯ軸３が回転し始めても、ＰＴＯ軸３を回転させない条件が成立したらＰＴＯ軸３の回転を停止させることにより安全を図ることができる。 Further, as in cases 6 and 7, when the PTO shaft is rotating when the PTO switch 30 is on, when the axis discrimination switch 25 changes from L to H or from H to L, the hydraulic clutch 13 is disengaged, and the PTO shaft The rotation of 3 is stopped. Thus, once the PTO shaft 3 starts to rotate, safety can be ensured by stopping the rotation of the PTO shaft 3 if the condition for not rotating the PTO shaft 3 is satisfied.
１ トラクタ
２ 耕耘機
３ ＰＴＯ軸
Ａ 高速用のＰＴＯ軸
Ｂ 低速用のＰＴＯ軸
Ｅ エンジン
６ ＰＴＯ駆動ギア
８ 着脱リング
９ トランスミッション
１０ ＰＴＯクラッチ機構
１１ ＰＴＯ変速機構
１２ 比例ソレノイドバルブ
１３ 油圧クラッチ
１４ ＰＴＯ変速操作レバー
１５ シフターアーム
１６ 回軸
１９ ピン
２０ レバー位置検出スイッチ
２２ 軸ケース
２４ 段部
２５ 軸判別スイッチ
２７ スリット
２８ 接点
２９ ＰＴＯ制御部
３０ ＰＴＯスイッチ
DESCRIPTION OF SYMBOLS 1 Tractor 2 Tillage machine 3 PTO axis A High speed PTO axis B Low speed PTO axis E Engine 6 PTO drive gear 8 Removable ring 9 Transmission 10 PTO clutch mechanism 11 PTO speed change mechanism 12 Proportional solenoid valve 13 Hydraulic clutch 14 PTO speed change operation Lever 15 Shifter arm 16 Rotating shaft 19 Pin 20 Lever position detection switch 22 Shaft case 24 Step portion 25 Axis discrimination switch 27 Slit 28 Contact 29 PTO control portion 30 PTO switch
Claims (2)
また作業車両には、ＰＴＯ軸の回転と停止を手動で操作するＰＴＯスイッチと、トランスミッションのＰＴＯ変速機構を操作するＰＴＯ変速操作レバーと、トランスミッションのＰＴＯ動力を断続する油圧クラッチと、をそれぞれ設けると共に、
前記ＰＴＯスイッチ、前記ＰＴＯ変速操作レバーの位置を検出するレバー位置検出スイッチ、及び、前記軸判別スイッチを、ＰＴＯ制御部の入力側に、また、前記油圧クラッチの入り切りを行う比例ソレノイドバルブを、ＰＴＯ制御部の出力側に、それぞれ接続し、
軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、ＰＴＯスイッチをオンにするとＰＴＯ軸が回転し、
他方、軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、ＰＴＯスイッチをオンにしてもＰＴＯ軸が回転しない、ように比例ソレノイドバルブを操作して前記油圧クラッチの入り切りを行ってＰＴＯ動力の断続を制御することを特徴とし、さらに、
前記ＰＴＯスイッチをオンにしてもＰＴＯ軸が回転しない場合は、前記軸判別スイッチがオンからオフにまたはオフからオンに変化しても前記油圧クラッチの切りを維持することを特徴とする作業車両のＰＴＯ軸制御装置。 A work machine is connected to the rear part of the work vehicle body, A and B PTO shafts with different rotation speeds are provided on the work machine side to transmit the rotational power of the work vehicle side, and the A or B PTO shaft is used as the work vehicle. A shaft discriminating switch that is mounted on the transmission of the motor and stores the B or A PTO shaft, which is not used, in the shaft case provided in the work vehicle. The shaft case is turned on when the stored PTO shaft is B and turned off when A. Provided,
The work vehicle is provided with a PTO switch for manually operating rotation and stop of the PTO shaft, a PTO shift operation lever for operating the PTO transmission mechanism of the transmission, and a hydraulic clutch for intermittently connecting the PTO power of the transmission. ,
The PTO switch, a lever position detection switch for detecting the position of the PTO shift operation lever, and the shaft discrimination switch are provided on the input side of the PTO control unit, and a proportional solenoid valve for turning on / off the hydraulic clutch is provided. Connect to the output side of the control unit,
When the axis discrimination switch is on and the lever position detection switch is off on the PTO shift operation lever A side, or when the axis discrimination switch is off and the lever position detection switch is on on the PTO shift operation lever B side When the PTO switch is turned on, the PTO shaft rotates,
On the other hand, when the axis discrimination switch is on and the lever position detection switch is on on the PTO shift operation lever B side, or the axis discrimination switch is off and the lever position detection switch is off on the PTO shift operation lever A side. At this time, the PTO shaft is not rotated even when the PTO switch is turned on, the proportional solenoid valve is operated so that the hydraulic clutch is turned on and off to control the PTO power intermittently,
The case even if the PTO switch on the PTO shaft not rotating, work also the axis determination switch is changed from OFF to ON or from ON to OFF you and maintains the cutting of the hydraulic clutch Vehicle PTO axis control device.
また作業車両には、ＰＴＯ軸の回転と停止を手動で操作するＰＴＯスイッチと、トランスミッションのＰＴＯ変速機構を操作するＰＴＯ変速操作レバーと、トランスミッションのＰＴＯ動力を断続する油圧クラッチと、をそれぞれ設けると共に、
前記ＰＴＯスイッチ、前記ＰＴＯ変速操作レバーの位置を検出するレバー位置検出スイッチ、及び、前記軸判別スイッチを、ＰＴＯ制御部の入力側に、また、前記油圧クラッチの入り切りを行う比例ソレノイドバルブを、ＰＴＯ制御部の出力側に、それぞれ接続し、
軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、ＰＴＯスイッチをオンにするとＰＴＯ軸が回転し、
他方、軸判別スイッチがオンで、且つ、ＰＴＯ変速操作レバーB側でレバー位置検出スイッチがオンのとき、もしくは軸判別スイッチがオフで、且つ、ＰＴＯ変速操作レバーA側でレバー位置検出スイッチがオフのとき、ＰＴＯスイッチをオンにしてもＰＴＯ軸が回転しない、ように比例ソレノイドバルブを操作して前記油圧クラッチの入り切りを行ってＰＴＯ動力の断続を制御することを特徴とし、さらに、
前記ＰＴＯスイッチをオンにしてＰＴＯ軸が回転している場合は、前記軸判別スイッチがオンからオフにまたはオフからオンに変化したら、前記油圧クラッチを切りにしＰＴＯ軸の回転を停止することを特徴とする作業車両のＰＴＯ軸制御装置。 A work machine is connected to the rear part of the work vehicle body, A and B PTO shafts with different rotation speeds are provided on the work machine side to transmit the rotational power of the work vehicle side, and the A or B PTO shaft is used as the work vehicle. A shaft discriminating switch that is mounted on the transmission of the motor and stores the B or A PTO shaft, which is not used, in the shaft case provided in the work vehicle. The shaft case is turned on when the stored PTO shaft is B and turned off when A. Provided,
Further, the work vehicle is provided with a PTO switch for manually operating rotation and stop of the PTO shaft, a PTO speed change operation lever for operating the PTO speed change mechanism of the transmission, and a hydraulic clutch for intermittently connecting the PTO power of the transmission. ,
The PTO switch, a lever position detection switch for detecting the position of the PTO shift operation lever, and the shaft discrimination switch are provided on the input side of the PTO control unit, and a proportional solenoid valve for turning on / off the hydraulic clutch is provided. Connect to the output side of the control unit,
When the axis discrimination switch is on and the lever position detection switch is off on the PTO shift operation lever A side, or when the axis discrimination switch is off and the lever position detection switch is on on the PTO shift operation lever B side When the PTO switch is turned on, the PTO shaft rotates,
On the other hand, when the axis discrimination switch is on and the lever position detection switch is on on the PTO shift operation lever B side, or the axis discrimination switch is off and the lever position detection switch is off on the PTO shift operation lever A side. At this time, the PTO shaft is not rotated even if the PTO switch is turned on, the proportional clutch is operated so that the hydraulic clutch is turned on and off to control the PTO power intermittently,
When the PTO shaft is rotating with the PTO switch turned on, the hydraulic clutch is disengaged and the rotation of the PTO shaft is stopped when the axis discrimination switch changes from on to off or from off to on. PTO shaft control device to that work vehicle with.
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| JPS6021889B2 (en) * | 1980-05-16 | 1985-05-30 | 井関農機株式会社 | Misoperation prevention device for PTO transmission mechanism |
| GB9623784D0 (en) * | 1996-11-15 | 1997-01-08 | Massey Ferguson Sa | PTQ shaft monitoring & control system |
| JP5070788B2 (en) * | 2006-09-29 | 2012-11-14 | 井関農機株式会社 | Work vehicle |
| JP5944305B2 (en) * | 2012-12-17 | 2016-07-05 | ヤンマー株式会社 | Work vehicle |
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