JPS6257847B2 - - Google Patents
Info
- Publication number
- JPS6257847B2 JPS6257847B2 JP57086126A JP8612682A JPS6257847B2 JP S6257847 B2 JPS6257847 B2 JP S6257847B2 JP 57086126 A JP57086126 A JP 57086126A JP 8612682 A JP8612682 A JP 8612682A JP S6257847 B2 JPS6257847 B2 JP S6257847B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- clutch
- control valve
- chamber
- pressure oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/12—Details not specific to one of the before-mentioned types
- F16D25/14—Fluid pressure control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0209—Control by fluid pressure characterised by fluid valves having control pistons, e.g. spools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0221—Valves for clutch control systems; Details thereof
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Description
【発明の詳細な説明】
この発明は、トラクタの如き移動農機に設けら
れている作動動力取出のためのPTOクラツチの
作動を制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the operation of a PTO clutch provided in a mobile agricultural machine such as a tractor for extracting operating power.
移動農機に連結している作業機の作業部を駆動
するにあたつては、作業機がロータリの場合には
PTOクラツチの接続の際にいわゆる半クラツチ
状態とならないように圧力油を急速にそのクラツ
チシリンダに供給するのが望ましいのであるが、
例えば、モアの如く作業部の慣性の大きい作業機
の場合には、半クラツチの状態をしばらく保つよ
うにPTOクラツチを徐々に接続するのが望まし
いのであつて、かかる配慮をせずにPTOクラツ
チを瞬時に接続すると作業部の大きな慣性のため
に大きな衝撃力が動力伝達系統に作用して、安全
ピンがクラツチ接続操作のつど切断してしまうこ
とになり、作業継続が出来なくなる。そこで、こ
の点を克服するため、実開昭55−56926号公報及
び実開昭49−7335号公報所載のものが知られてい
る。而して、前者は昇圧コントロール弁と１時逃
がし室を備えた作動油圧装置が開示されており、
後者はケースに制御弁体を着脱自在に取付けた摩
擦多板クラツチの圧力リリーフ弁装置が開示され
ている。そこで、この発明は、之等の各公報所載
の前記公知技術を上位概念とし、この技術的思想
をPTOクラツチの作動油圧制御装置に具体的に
実現せんとし、且つ、前記従来の問題点に鑑み、
之を克服せんとして提案せられたものであり、
PTOクラツチシリンダに供給する作動圧力油
を、昇圧コントロール弁の戻し側の弁室と絞りを
有する戻し阻止側の弁室とに夫々導入することに
より、上記圧力油の油圧上昇に伴つて戻し側の弁
室の圧力油をタンクに戻し、或は、この戻し動作
を停止するように交互にこれらの動作が繰り返さ
れるようにした昇圧コントロール弁を備えると共
に、上記PTOクラツチシリンダ内の圧力が設定
値に到達するまでの間は上記の戻し阻止側の弁室
の圧力油を逃がすよう形成している１時逃がし室
を併設した作動油圧制御装置において、上記昇圧
コントロール弁と１時逃がし室とを１の制御弁体
に内装形成し、この制御弁体をミツシヨンケース
の仕切壁に支持されたPTOクラツチのクラツチ
ケースへ着脱可能に取付けてなるPTOクラツチ
の作動油圧制御装置を提供せんとするものであ
る。 When driving the working part of a working machine connected to a mobile agricultural machine, if the working machine is rotary,
It is desirable to rapidly supply pressure oil to the clutch cylinder to avoid a so-called half-clutch condition when the PTO clutch is engaged.
For example, in the case of a working machine such as a mower, which has a large inertia of the working part, it is desirable to gradually connect the PTO clutch so as to maintain the half-clutch state for a while. If it is connected instantly, a large impact force will act on the power transmission system due to the large inertia of the working part, and the safety pin will break every time the clutch is connected, making it impossible to continue the work. In order to overcome this problem, the methods disclosed in Japanese Utility Model Application Publication No. 55-56926 and Japanese Utility Model Application Publication No. 49-7335 are known. The former discloses a hydraulic system equipped with a pressure boost control valve and a one-hour relief chamber.
The latter discloses a pressure relief valve device of a friction multi-plate clutch in which a control valve body is detachably attached to a case. Therefore, the present invention uses the above-mentioned known techniques published in the above publications as a general concept, and attempts to concretely realize this technical idea in a hydraulic pressure control device for a PTO clutch, and also solves the above-mentioned conventional problems. In view,
This was proposed in an attempt to overcome this.
By introducing the operating pressure oil to be supplied to the PTO clutch cylinder into the return side valve chamber of the boost control valve and the return prevention side valve chamber having a throttle, the return side increases as the hydraulic pressure of the pressure oil increases. It is equipped with a pressure increase control valve that alternately repeats these operations to return the pressure oil in the valve chamber to the tank or stop this return operation, and also to prevent the pressure in the PTO clutch cylinder from reaching the set value. In a hydraulic pressure control system equipped with a 1-hour relief chamber, which is formed to release the pressure oil in the valve chamber on the return prevention side, the pressure increase control valve and the 1-hour relief chamber are connected to the 1-hour relief chamber. It is an object of the present invention to provide an operating hydraulic control device for a PTO clutch, which is formed internally in a control valve body and is removably attached to a clutch case of a PTO clutch supported on a partition wall of a transmission case. .
以下、本発明の一実施例を別紙添付図面に従つ
て詳細に述べる。尚、説明の都合上、従来公低に
属するものも同時に説明する。第１図に示すよう
に、ポンプ１の圧力油は設定圧力を越えるときに
タンク２に戻すようにしたリリーフ弁３を介して
PTOクラツチ切替弁４に連通し、このPTOクラ
ツチ切替弁４の切替操作によつてタンク２に圧力
油を戻したり、或は、PTOクラツチのクラツチ
シリンダ５へ絞り６を介して圧力油を供給するよ
うに設けている。そして、絞り６とクラツチシリ
ンダ５との間に昇圧コントロール弁７を接続し、
この昇圧コントロール弁７は絞り６から油路８を
経て流入する圧力油を油路９からタンク２へ圧力
油を戻す戻しポート１０と、タンク２への戻しを
阻止する塞ぎ部１１とを備え、前記の絞り６から
の圧力油を弁体１２の戻り側の弁室１３及び絞り
１４を介して戻り阻止側の弁室１５に夫々に供給
し、ばね１６によつて弁体１２が弁室１３の方向
へ押動されて上記圧力油の作用を助けるように附
勢する。そして、この他方の弁室１５に供給され
る圧力油は１時逃がし室１７にも供給するように
設け、ストツパ１８に当接する迄ばね１９に抗し
てこの１時逃がし室１７の摺動子２０が圧力油に
よつて押動されるように形成して、このストツパ
１８の位置を調節ねじ２１にて移動調節できるよ
うに構成しているが、１時逃がし室１７は之に限
定せられるべきではない。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Incidentally, for the convenience of explanation, things that conventionally belong to the public and low categories will also be explained at the same time. As shown in Fig. 1, the pressure oil in the pump 1 is returned to the tank 2 through a relief valve 3 when the set pressure is exceeded.
It communicates with the PTO clutch switching valve 4, and by switching the PTO clutch switching valve 4, pressure oil is returned to the tank 2, or pressure oil is supplied to the clutch cylinder 5 of the PTO clutch via the throttle 6. It is set up like this. Then, a boost control valve 7 is connected between the throttle 6 and the clutch cylinder 5,
This pressure increase control valve 7 includes a return port 10 that returns pressure oil flowing from the throttle 6 through the oil path 8 to the tank 2 from the oil path 9, and a closing portion 11 that prevents the pressure oil from returning to the tank 2. The pressure oil from the throttle 6 is supplied to the valve chamber 13 on the return side of the valve body 12 and the valve chamber 15 on the return prevention side through the throttle 14, and the valve body 12 is moved into the valve chamber 13 by the spring 16. It is pushed in the direction of , and is energized to assist the action of the pressure oil. The pressure oil supplied to the other valve chamber 15 is also supplied to the one-hour relief chamber 17, and the slider of this one-hour relief chamber 17 is pushed against the spring 19 until it comes into contact with the stopper 18. 20 is formed to be pushed by pressure oil, and the position of this stopper 18 can be adjusted by adjusting screw 21, but the one-time relief chamber 17 is limited to this. Shouldn't.
そして、PTOクラツチを接続するにあたつて
PTOクラツチ切替弁４を第１図のように昇圧コ
ントロール弁７へリリーフ弁３からの圧力油が供
給されるクラツチ接続位置に切替えれば、絞り６
を通つた圧力油は昇圧コントロール弁７の戻り側
の弁室１３に供給されると同時に絞り１４を通つ
て戻り阻止側の弁室１５及び１時逃がし室１７の
弁室２２にも夫々供給されるが、絞り１４を経由
するので弁室１５及び２２への圧力油の流入量が
少くなつて弁体１２は弁室１５の方へ移動し、こ
の為、戻しポート１０は油路９に開口することに
なつてポンプ１からの圧力油の殆んどはタンク２
へ戻つてしまうのでクラツチシリンダ５には圧力
油が僅かに供給されることになる。そして、しば
らくすると、弁室１５内に圧力油が充満してばね
１６に附勢されて弁体１２は、弁室１３の方に押
し戻されるので戻しポート１０は油路９から外れ
て塞ぎ部１１が油路９と弁室１３との連絡を断つ
ことになり、ポンプ１の圧力油はタンク２には戻
らずに、主としてクラツチシリンダ５に供給され
て一部は絞り１４を経て弁室１５にも供給される
のでクラツチシリンダ５内の油圧は上昇すること
になる。そして、この上昇しつつある油圧と同圧
の圧力油は弁室１３にも同時に作用するので、絞
り１４にて絞られて供給される弁室１５内の圧力
よりもこの弁室１３の圧力は大きくなり、このた
め弁体１２は弁室１５の方に押動されて戻しポー
ト１０が油路９に開口して弁室１３の圧力は急速
に低下し始める。そうすると、弁室１５の圧力と
ばね１６によつて再び弁体１２が弁室１３の方に
押し戻されるので、タンク２への戻り油は阻止さ
れてクラツチシリンダ５内の圧力油の圧力は上昇
することになり、このようにして弁体１２の小刻
みな左右移動によつてポンプ１からの圧力油の一
部をタンク２に逃がしたり、或は、クラツチシリ
ンダ５内に供給しながらクラツチシリンダ５の圧
力は第２図の圧力上昇図の実線の圧力曲線F1の
範囲R1で示すように緩やかに上昇することにな
る。そして、この圧力上昇の際に、弁室１５内に
供給される圧力油の一部は１時逃がし室１７の弁
室２２に逃げることになるので弁体１２を弁室１
３の方へ移動する力は弱くなつて弁室１３内の圧
力油がタンク２に戻つている時間は長くなり、こ
の為、クラツチシリンダ５内の油圧上昇率は上述
の範囲R1のように緩やかとなるのである。そし
て、１時逃がし室１７の摺動子２０がストツパ１
８に当接するとクラツチシリンダ５内の油圧は第
２図の圧力P1に到達し、以後は弁室２２には圧力
油が逃げないので弁体１２を弁室１３の方へ押動
する力は大きくなつて、この為クラツチシリンダ
５内の圧力上昇率は第２図の範囲R2のように大
きくなる。そして、クラツチシリンダ５内の圧力
がリリーフ弁３にて設定されている所定の圧力P2
に到達すると、リリーフ弁３はポンプ１の圧力油
をタンク２に戻すことになつて、以後は所定の圧
力が保持されるのであり、第３図には上述の圧力
上昇経過に対応するPTOシヤフトの回転速度の
立上り状態を回転速度曲線S1で示したとおり、範
囲R1では緩やかに、又、範囲R2ではその立上り
がやや急となるものである。 And when connecting the PTO clutch
If the PTO clutch switching valve 4 is switched to the clutch connection position where pressure oil from the relief valve 3 is supplied to the boost control valve 7 as shown in FIG.
The pressure oil that has passed through is supplied to the return side valve chamber 13 of the boost control valve 7, and at the same time is also supplied to the return prevention side valve chamber 15 and the valve chamber 22 of the one-time relief chamber 17 through the throttle 14. However, since the pressure oil passes through the throttle 14, the amount of pressure oil flowing into the valve chambers 15 and 22 decreases, and the valve body 12 moves toward the valve chamber 15. Therefore, the return port 10 opens to the oil passage 9. Most of the pressure oil from pump 1 goes to tank 2.
Therefore, a small amount of pressure oil is supplied to the clutch cylinder 5. After a while, the valve chamber 15 is filled with pressure oil and is urged by the spring 16 to push the valve body 12 back toward the valve chamber 13, so that the return port 10 is removed from the oil passage 9 and the blocking portion 11 The communication between the oil passage 9 and the valve chamber 13 is cut off, and the pressure oil from the pump 1 is not returned to the tank 2, but is mainly supplied to the clutch cylinder 5, and a portion passes through the throttle 14 and enters the valve chamber 15. is also supplied, so the oil pressure inside the clutch cylinder 5 increases. Since the pressure oil having the same pressure as this rising oil pressure acts on the valve chamber 13 at the same time, the pressure in the valve chamber 13 is lower than the pressure in the valve chamber 15 that is throttled and supplied by the throttle 14. As a result, the valve body 12 is pushed toward the valve chamber 15, the return port 10 opens to the oil passage 9, and the pressure in the valve chamber 13 begins to decrease rapidly. Then, the pressure in the valve chamber 15 and the spring 16 push the valve body 12 back toward the valve chamber 13, preventing the oil from returning to the tank 2 and increasing the pressure of the pressure oil in the clutch cylinder 5. In this way, a part of the pressure oil from the pump 1 can be released to the tank 2 by moving the valve body 12 left and right in small increments, or a part of the pressure oil can be released into the clutch cylinder 5 while being supplied into the clutch cylinder 5. The pressure will rise gradually as shown in the range R 1 of the solid line pressure curve F 1 in the pressure rise diagram of FIG. When this pressure rises, a part of the pressure oil supplied into the valve chamber 15 escapes to the valve chamber 22 of the relief chamber 17, so the valve body 12 is removed from the valve chamber 15.
3 becomes weaker, and the time for the pressure oil in the valve chamber 13 to return to the tank 2 becomes longer, and for this reason, the oil pressure increase rate in the clutch cylinder 5 becomes as in the range R 1 mentioned above. It becomes gradual. Then, at 1 o'clock, the slider 20 of the relief chamber 17 is moved to the stopper 1.
8, the oil pressure in the clutch cylinder 5 reaches the pressure P1 shown in FIG. becomes large, and therefore the rate of pressure rise in the clutch cylinder 5 becomes large as shown in range R2 in FIG. Then, the pressure inside the clutch cylinder 5 reaches a predetermined pressure P 2 set by the relief valve 3.
When the pressure oil reaches the tank 2, the relief valve 3 returns the pressure oil from the pump 1 to the tank 2, and from then on, the predetermined pressure is maintained. As shown by the rotational speed curve S1 , the rise of the rotational speed is gradual in the range R1 , and slightly steeper in the range R2 .
そして以上の構成に於て、この昇圧コントロー
ル弁７と１時逃がし室１７とを１個の制御弁体２
３に内装形成し、第５図のようにミツシヨンケー
ス２４の外側部に取付けられているPTOクラツ
チ切替弁４（第４図には図示を省略）を制御弁体
２３を介してクラツチシリンダ５に連通し、クラ
ツチシリンダ５を覆うように形成されてミツシヨ
ンケース２４の仕切壁２４ａ（第４図の実施例で
はPTOクラツチ２５と走行変速機構２６との間
に位置している）に固定されているクラツチケー
ス２７に切欠部２７ａを設け、クラツチケース２
７に形成した油路２８を仕切壁２４ａに設けた油
路２９を介してPTOクラツチ切替弁４に連通し
て、切欠部２７ａに制御弁体２３を挿入したう
え、油路２８のテーパー状のめねじ２８ａへ制御
弁体２３に形成しているテーパー状の取付ねじ２
３ａを螺合して制御弁体２３をクラツチケース２
７に取付けて、ポンプ１の圧力油がPTOクラツ
チ切替弁４と油路２９を経て制御弁体２３から油
路２８を通り、クラツチシリンダ５の油路３０に
よつてピストン３１を押動できるように設け、メ
インクラツチ３２の入力側に連結されている入力
軸３３は摩擦板群３４の圧接動作によつて出力軸
３５に結合されることになり、PTO変速機構３
６を介してPTO駆動シヤフト３７を駆動できる
ように構成している。又、第１図のように、ポン
プ１の圧力油はコントロールバルブ３８を介して
リフト機構３９のシリンダ４０にも供給されてい
る。従つて、PTOクラツチ切替弁４をクラツチ
接続位置に切替えたときは、昇圧コントロール弁
７の弁体１２が左右に小刻みに移動してポンプ１
の圧力油をタンク２に逃がす動作、或は、クラツ
チシリンダ５内に供給する動作を交互に繰返すの
でクラツチシリンダ５内の圧力上昇はタンク２へ
の逃がし動作によつて緩やかとなるものである。
そして、この逃がし動作を中断させるために弁室
１５に供給される圧力油は、１時逃がし室１７の
弁室２２に逃がされるのでこの１時逃がし室１７
の作用が継続している間は、クラツチシリンダ５
内の圧力上昇は一そう緩やかとなるものであつ
て、第２図にかかる昇圧コントロール弁７と１時
逃がし室１７を備えていない従来の制御装置を使
用したクラツチシリンダ５内の圧力上昇を示した
点線の圧力曲線F2と比べれば、この発明装置を
使用したときの圧力曲線F1で示すとおりとなる
のであつて、このクラツチシリンダ５のクラツチ
ピストンにて回転力を伝達されるPTOシヤフト
の回転速度は、第３図に示す従来の制御装置によ
る回転速度曲線S2に比べてこの発明装置使用の回
転速度曲線S1は緩やかな立上りを示しているので
ある。 In the above configuration, the pressure increase control valve 7 and the one-hour relief chamber 17 are connected to one control valve body 2.
The PTO clutch switching valve 4 (not shown in FIG. 4), which is formed internally at 3 and attached to the outside of the transmission case 24 as shown in FIG. It is formed to cover the clutch cylinder 5 and is fixed to the partition wall 24a of the transmission case 24 (located between the PTO clutch 25 and the traveling transmission mechanism 26 in the embodiment shown in FIG. 4). A notch 27a is provided in the clutch case 27, and the clutch case 2
7 is connected to the PTO clutch switching valve 4 via an oil passage 29 provided in the partition wall 24a, and the control valve body 23 is inserted into the notch 27a. Tapered mounting screw 2 formed on control valve body 23 to female thread 28a
3a and attach the control valve body 23 to the clutch case 2.
7, so that the pressure oil of the pump 1 passes through the PTO clutch switching valve 4 and the oil passage 29, and then from the control valve body 23 to the oil passage 28, so that the piston 31 can be pushed by the oil passage 30 of the clutch cylinder 5. The input shaft 33 connected to the input side of the main clutch 32 is connected to the output shaft 35 by the pressing operation of the friction plate group 34,
6, the PTO drive shaft 37 can be driven. Further, as shown in FIG. 1, the pressure oil of the pump 1 is also supplied to the cylinder 40 of the lift mechanism 39 via the control valve 38. Therefore, when the PTO clutch switching valve 4 is switched to the clutch connection position, the valve body 12 of the boost control valve 7 moves little by little to the left and right, and the pump 1
Since the operation of releasing the pressure oil to the tank 2 and the operation of supplying it into the clutch cylinder 5 are repeated alternately, the pressure increase in the clutch cylinder 5 is made gentler due to the operation of releasing the pressure oil to the tank 2.
The pressure oil supplied to the valve chamber 15 to interrupt this relief operation is released to the valve chamber 22 of the one hour relief chamber 17.
While the action of clutch cylinder 5 continues,
The pressure rise inside the clutch cylinder 5 is rather gradual, and FIG. When compared with the dotted line pressure curve F 2 , the pressure curve F 1 when using the device of this invention is as shown by the pressure curve F 1 of the PTO shaft to which the rotational force is transmitted by the clutch piston of the clutch cylinder 5. Regarding the rotation speed, the rotation speed curve S 1 using the device of the present invention shows a gradual rise compared to the rotation speed curve S 2 obtained by the conventional control device shown in FIG.
この発明は、上記一実施例に於て詳細に説明し
たように、作業機の作業部駆動の際にPTOクラ
ツチシリンダに供給する圧力油の油圧上昇を緩や
かとすることによつて、PTOシヤフトの回転速
度を緩やかに立上がらせることができるので、モ
アの如く作業部の慣性の大きい作業機の駆動にあ
たつてその動力伝達系統に作用する衝撃力を充分
に緩和することができることは当然であるが、特
に、この作動油圧制御装置は昇圧コントロール弁
と１時逃がし室とを１個の制御弁体に内装形成
し、この制御弁体をミツシヨンケースの仕切壁に
支持されたPTOクラツチのクラツチケースに着
脱可能に取付けているので、これを取付けるため
の特別な部材を必要としないでミツシヨンケース
内にコンパクトに納めることができる。又、制御
弁体がクラツチケースと共に一体にミツシヨンケ
ースへ着脱できるので、作動の確認をミツシヨン
ケースの外で行うことができることになつて、調
整と着脱作業を容易に行える。又、制御弁体とク
ラツチシリンダの間に特別な油管を設ける必要が
なくなつて、制御弁体を取付けるための例えばめ
ねじをクラツチケースに設ける程度でよいから、
加工も簡単となつたのである。 As explained in detail in the above-mentioned embodiment, this invention reduces the pressure of the PTO shaft by slowing the rise in pressure oil supplied to the PTO clutch cylinder when driving the working part of the working machine. Since the rotational speed can be gradually increased, it is natural that the impact force acting on the power transmission system when driving a working machine such as a mower with a large inertia of the working part can be sufficiently alleviated. However, in particular, this hydraulic pressure control system has a boost control valve and a one-time relief chamber internally formed in one control valve body, and this control valve body is connected to a PTO clutch supported on a partition wall of a mission case. Since it is removably attached to the clutch case, it can be compactly stored in the transmission case without requiring special members for attaching it. Furthermore, since the control valve body can be attached to and removed from the transmission case together with the clutch case, the operation can be checked outside the transmission case, making adjustment and attachment/detachment work easier. In addition, there is no need to provide a special oil pipe between the control valve body and the clutch cylinder, and it is sufficient to provide, for example, a female thread in the clutch case for attaching the control valve body.
Processing also became easier.
各図はこの発明の一実施例を示し、第１図は油
圧回路図、第２図はPTOクラツチシリンダ内の
油圧の圧力上昇図、第３図はPTOシヤフトの回
転速度の立上り状態を示す回転速度曲線図、第４
図はミツシヨンケースの要部縦断側面図、第５図
は第４図のＡ−Ａ線断面図、第６図は第５図のＢ
−Ｂ線断面図である。
符号説明、１……ポンプ、２……タンク、３…
…リリーフ弁、４……PTOクラツチ切替弁、５
……クラツチシリンダ、６，１４……絞り、７…
…昇圧コントロール弁、８，９……油路、１０…
…戻しポート、１１……塞ぎ部、１２……弁体、
１３，１５，２２……弁室、１６，１９……ば
ね、１７……１時逃がし室、１８……ストツパ、
２０……摺動子、２１……調節ねじ、２３……制
御弁体、２３ａ……取付ねじ、２４ａ……仕切
壁、２４……ミツシヨンケース、２８，２９，３
０……油路、２５……PTOクラツチ、２６……
走行変速機構、２７……クラツチケース、２７ａ
……切欠部、２８ａ……めねじ、３１……ピスト
ン、３２……メインクラツチ、３３……入力軸、
３４……摩擦板群、３５……出力軸、３６……
PTO変速機構、３７……PTO駆動シヤフト、３
８……コントロールバルブ、３９……リフト機
構、４０……シリンダ、F1，F2……圧力曲績、
S1，S2……回転速度曲線、P1，P2……圧力、
R1，R2……範囲。
Each figure shows an embodiment of the present invention. Figure 1 is a hydraulic circuit diagram, Figure 2 is a pressure rise diagram of the hydraulic pressure in the PTO clutch cylinder, and Figure 3 is a rotation diagram showing the rising state of the rotational speed of the PTO shaft. Speed curve diagram, 4th
The figure is a vertical side view of the main part of the mission case, Figure 5 is a sectional view taken along line A-A in Figure 4, and Figure 6 is B in Figure 5.
-B sectional view. Explanation of symbols, 1...pump, 2...tank, 3...
...Relief valve, 4...PTO clutch switching valve, 5
...Clutch cylinder, 6, 14...Aperture, 7...
...Boost control valve, 8, 9...Oil line, 10...
...Return port, 11...Closing portion, 12...Valve body,
13, 15, 22...Valve chamber, 16, 19...Spring, 17...1 o'clock relief chamber, 18...Stopper,
20... Slider, 21... Adjustment screw, 23... Control valve body, 23a... Mounting screw, 24a... Partition wall, 24... Mission case, 28, 29, 3
0...Oil line, 25...PTO clutch, 26...
Traveling transmission mechanism, 27...Clutch case, 27a
... Notch, 28a ... Female thread, 31 ... Piston, 32 ... Main clutch, 33 ... Input shaft,
34...Friction plate group, 35...Output shaft, 36...
PTO transmission mechanism, 37...PTO drive shaft, 3
8...Control valve, 39...Lift mechanism, 40...Cylinder, F1 , F2 ...Pressure curve,
S 1 , S 2 ... Rotational speed curve, P 1 , P 2 ... Pressure,
R 1 , R 2 ... range.
Claims (1)
油を、昇圧コントロール弁の戻し側の弁室と絞り
を有する戻し阻止側の弁室とに夫々導入すること
により、上記圧力油の油圧上昇に伴つて戻し側の
弁室の圧力油をタンクに戻し、或は、この戻し動
作を停止するように交互にこれらの動作が繰り返
されるようにした昇圧コントロール弁を備えると
共に、上記PTOクラツチシリンダ内の圧力が設
定値に到達するまでの間は上記の戻し阻止側の弁
室の圧力油を逃がすよう形成している１時逃がし
室を併設した作動油圧制御装置において、上記昇
圧コントロール弁と１時逃がし室とを１の制御弁
体に内装形成し、この制御弁体をミツシヨンケー
スの仕切壁に支持されたPTOクラツチのクラツ
チケースへ着脱可能に取付けてなるPTOクラツ
チの作動油圧制御装置。1. By introducing the working pressure oil to be supplied to the PTO clutch cylinder into the return side valve chamber of the boost control valve and the return prevention side valve chamber having a throttle, the return side increases as the hydraulic pressure of the pressure oil increases. It is equipped with a pressure increase control valve that alternately repeats these operations to return the pressure oil in the valve chamber to the tank or stop this return operation, and the pressure in the PTO clutch cylinder is set to a set value. In a hydraulic pressure control system equipped with a 1-hour relief chamber, which is formed to release the pressure oil in the valve chamber on the return prevention side, the pressure increase control valve and the 1-hour relief chamber are connected to A hydraulic pressure control device for a PTO clutch, which is formed internally in a control valve body, and this control valve body is removably attached to a clutch case of a PTO clutch supported on a partition wall of a transmission case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57086126A JPS58203233A (en) | 1982-05-21 | 1982-05-21 | Working oil pressure controller of pto clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57086126A JPS58203233A (en) | 1982-05-21 | 1982-05-21 | Working oil pressure controller of pto clutch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58203233A JPS58203233A (en) | 1983-11-26 |
| JPS6257847B2 true JPS6257847B2 (en) | 1987-12-03 |
Family
ID=13878006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57086126A Granted JPS58203233A (en) | 1982-05-21 | 1982-05-21 | Working oil pressure controller of pto clutch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58203233A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01254147A (en) * | 1988-04-01 | 1989-10-11 | Saibanetetsuku:Kk | Device for stereoscopically displaying tomographic image on tv screen in real time |
| WO2020130318A1 (en) * | 2018-12-18 | 2020-06-25 | 엘지전자 주식회사 | Tandem solar cell |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60205025A (en) * | 1984-03-30 | 1985-10-16 | Aisin Seiki Co Ltd | Clutch pressure control mechanism provided with auxiliary chamber |
| JPH0419243Y2 (en) * | 1985-03-22 | 1992-04-30 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS496692A (en) * | 1972-05-10 | 1974-01-21 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS497335U (en) * | 1972-04-25 | 1974-01-22 | ||
| JPS5840347Y2 (en) * | 1978-10-11 | 1983-09-10 | 株式会社小松製作所 | Power shift transmission hydraulic control device |
-
1982
- 1982-05-21 JP JP57086126A patent/JPS58203233A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS496692A (en) * | 1972-05-10 | 1974-01-21 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01254147A (en) * | 1988-04-01 | 1989-10-11 | Saibanetetsuku:Kk | Device for stereoscopically displaying tomographic image on tv screen in real time |
| WO2020130318A1 (en) * | 2018-12-18 | 2020-06-25 | 엘지전자 주식회사 | Tandem solar cell |
| US11616160B2 (en) | 2018-12-18 | 2023-03-28 | Shangrao Jinko Solar Technology Development Co., Ltd | Tandem solar cell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58203233A (en) | 1983-11-26 |
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