JPH0450211B2 - - Google Patents
Info
- Publication number
- JPH0450211B2 JPH0450211B2 JP57170712A JP17071282A JPH0450211B2 JP H0450211 B2 JPH0450211 B2 JP H0450211B2 JP 57170712 A JP57170712 A JP 57170712A JP 17071282 A JP17071282 A JP 17071282A JP H0450211 B2 JPH0450211 B2 JP H0450211B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pressure
- pto clutch
- oil
- 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 - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000630 rising 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
- 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
- F16D48/04—Control by fluid pressure providing power assistance
-
- 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
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1026—Hydraulic
-
- 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
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/104—Clutch
- F16D2500/10406—Clutch position
- F16D2500/10437—Power Take Off clutch
-
- 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
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50239—Soft clutch engagement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Arrangement And Driving Of Transmission Devices (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、トラクタに設けられているPTO
クラツチの作動を制御する作動油圧制御装置に関
するものである。[Detailed Description of the Invention] This invention provides a PTO installed in a tractor.
The present invention relates to a hydraulic pressure control device for controlling the operation of a clutch.
作業機がロータリの場合には、PTOクラツチ
の接続の際に所謂、半クラツチ状態とならないよ
うに圧力油を１時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い衝撃力が
動力伝達係統に作用して、安全ピンが切断してし
まう等の問題がある。 When the working machine is a rotary type, it is desirable to supply pressure oil to the clutch cylinder at one time to prevent the so-called half-clutch state when the PTO clutch is connected. In the case of a work machine with large inertia, it is desirable to gradually connect the PTO clutch so as to keep it in a half-clutch state for a while, but if you connect the PTO clutch instantly without taking such consideration, the working part will be damaged. Due to the large inertia, a large impact force acts on the power transmission system, causing problems such as the safety pin breaking.
そこでこの発明においては、ポンプから作業機
昇降用のリフトシリンダに到る油路の途中に分流
弁を設け、この分流弁からPTOクラツチシリン
ダに到る油路の途中にこのPTOクラツチシリン
ダに供給する作動圧力油の油圧を制御できる昇圧
コントロール弁を設け、この昇圧コントロール弁
を、動作又は非動作の夫々に切替えできる切替弁
を設けた構成として、モア作業においては、昇圧
コントロール弁が動作するように切替弁を切替え
てPTOクラツチの接続動作を緩やかに行い、又、
ロータリ作業においては、昇圧コントロール弁が
動作しないように切替弁を切替えて、これら夫々
の作業に効率良く対応できるように工夫したもの
である。 Therefore, in this invention, a diversion valve is provided in the middle of the oil path leading from the pump to the lift cylinder for lifting and lowering the work equipment, and the oil is supplied to the PTO clutch cylinder in the middle of the oil path from this diversion valve to the PTO clutch cylinder. A pressure increase control valve that can control the hydraulic pressure of working pressure oil is provided, and a switching valve that can switch the pressure increase control valve to operation or non-operation is provided, and during mower work, the pressure increase control valve is operated. Switch the switching valve to slowly connect the PTO clutch, and
In rotary work, the switching valve is switched so that the boost control valve does not operate, so that each of these works can be handled efficiently.
そして具体的構造を図示の一実施例に基づいて
説明すれば、第２図に示すようにポンプ１の圧力
油は、設定圧を越えるときにタンク２へ戻すよう
にしたリリーフ弁３を介してPTOクラツチ切替
弁４に供給し、このPTOクラツチ切替弁４の切
替操作によつてタンク２の圧力油を戻したり、或
いはPTO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との間に切替弁Ａを介
して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
を弁体の戻し側の弁室１３及び絞り１４を介して
戻し阻止側の弁室１５夫々に供給し、ばね１６に
よつて弁体が弁室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
し弁１７にも供給するように設け、ストツパ１８
に当接するまでばね１９に抗してこの１時逃がし
弁１７の弁棒２０が圧力油によつて押動されるよ
うに形成し、このストツパ１８は、調節ねじ２２
にてばね１９に抗して押動されることになるの
で、その位置が任意に変更調節できるように構成
している。 To explain the specific structure based on an example shown in the drawings, as shown in FIG. The pressure oil is supplied to the PTO clutch switching valve 4, and by switching the PTO clutch switching valve 4, the pressure oil in the tank 2 is returned, or the pressure oil is supplied to the PTO clutch cylinder 5 through the throttle 6. There is. A pressure increase control valve 7 is connected between the throttle 6 and the clutch cylinder 5 via a switching valve A, and this pressure increase control valve 7 allows the pressure oil flowing from the throttle 6 through the oil passage 8 to flow from the oil passage 9. It is equipped with a return port 10 that returns pressure oil to the tank 2, and a closing part 11 that prevents the pressure oil from returning to the tank 2, and allows the pressure oil from the throttle 6 to pass through the valve chamber 13 and throttle 14 on the return side of the valve body. The pressure oil is supplied to each of the valve chambers 15 on the return prevention side, and the valve body is pushed toward the valve chamber 13 by the spring 16 and 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 valve 17, and the stopper 18
The valve stem 20 of the one-hour relief valve 17 is pushed by pressure oil against a spring 19 until it comes into contact with the adjusting screw 22.
Since it is pushed against the spring 19, its position can be changed and adjusted as desired.
そして、PTOクラツチを接続するにあたつて
第２図のように、切替弁Ａを絞り６が昇圧コント
ロール弁７に連通できる位置に切替えておいて、
PTOクラツチ切替弁４を同図のようにコントロ
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換えれば、絞り６を通つ
た圧力油は昇圧コントロール弁７の戻し側の弁室
１３に供給されると同時に絞り１４を通つて戻し
阻止側の弁室１５及び１時逃がし弁１７の弁室２
３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２３への圧力油の流入量が少くな
つて弁体は弁室１５の方へ移動し、このため戻し
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、PTOクラツチシリンダ５には圧力油
がわづ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PTO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、PTO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PTO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１
２の小刻みな左右移動によつてポンプ１から圧力
油の一部をタンク２に逃がしたり、或いはPTO
クラツチシリンダ５内に供給したりしながら
PTOクラツチシリンダ５の圧力油は第３図の圧
力上昇図の実線の圧力曲線F1の範囲R1で示すよ
うに緩かに上昇することになる。 Then, before connecting the PTO clutch, as shown in FIG. 2, switch the switching valve A to a position where the throttle 6 can communicate with the boost control valve 7.
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 control valve 7 as shown in the figure, the pressure oil passing through the throttle 6 will be transferred to the return side of the boost control valve 7. The valve chamber 15 on the return prevention side and the valve chamber 2 of the 1 o'clock relief valve 17 are supplied to the valve chamber 13 and simultaneously pass through the throttle 14.
3, but since the pressure oil passes through the throttle 14, the amount of pressure oil flowing into the valve chambers 15 and 23 decreases, and the valve body moves toward the valve chamber 15. Therefore, the return port 10 is filled with oil. Since most of the pressure oil from the pump 1 returns to the tank 2 due to the passage 9 being opened, a small amount of pressure oil is supplied to the PTO 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 back toward the valve chamber 13, so that the return port 10 is removed from the oil passage 9 and the blocking portion 11 is closed. The communication between the oil passage 9 and the valve chamber 13 is cut off, and the pressure oil from the pump 1 is mainly supplied to the PTO clutch cylinder 5 without returning to the tank 2, and some of it is also supplied to the valve chamber 15 via the throttle 14. As a result, the oil pressure inside the PTO clutch cylinder 5 will rise. Since the pressure oil having the same pressure as this rising oil pressure also acts on the valve chamber 13 at the same time, it is throttled by the throttle 14 and supplied to the valve chamber 15.
The pressure in the valve chamber 13 becomes higher than the pressure inside the valve chamber 13, so the valve body 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 rapidly decreases. Begin to. Then, the valve body is pushed back toward the valve chamber 13 by the pressure in the valve chamber 15 and the spring 16, which prevents the oil from returning to the tank 2 and increases the pressure of the pressure oil in the PTO clutch cylinder 5. Therefore, in this way, the valve body 1
Part of the pressure oil from pump 1 can be released to tank 2 by small left and right movements of pump 2, or PTO
While supplying it to the clutch cylinder 5.
The pressure oil in the PTO clutch cylinder 5 will gradually rise as shown in the range R 1 of the solid line pressure curve F 1 in the pressure rise diagram of FIG.
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時逃がし弁１７の弁室２
３に逃げることになるので、弁体を弁室１３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、
PTOクラツチシリンダ５内の油圧上昇率は上述
の範囲R1のように緩かとなるのである。そして、
１時逃がし弁１７の弁棒２０がストツパ１８に当
接すると、PTOクラツチシリンダ５内の油圧は
第３図の圧力P1に到達し、以後は弁室２３には
圧力油が逃げないので、弁体を弁室１３の方へ押
動する力は大きくなつてこの為、PTOクラツチ
シリンダ５内の圧力上昇率は第３図の範囲R2の
ように大きくなる。そして、PTO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、以後はこの所定の圧力が保持されるのであ
り、第４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よう
に構成している。 A part of the pressure oil supplied into the valve chamber 15 at the time of this pressure rise is transferred to the valve chamber 2 of the one-hour relief valve 17.
3, the force that moves the valve body toward the valve chamber 13 becomes weaker, and the time for the pressure oil in the valve chamber 13 to return to the tank 2 becomes longer.
The rate of increase in the oil pressure in the PTO clutch cylinder 5 is gradual as in the above-mentioned range R1 . and,
When the valve stem 20 of the 1-hour relief valve 17 comes into contact with the stopper 18, the oil pressure in the PTO clutch cylinder 5 reaches the pressure P1 shown in FIG. The force pushing the valve body toward the valve chamber 13 increases, so that the rate of pressure increase in the PTO clutch cylinder 5 increases as shown in range R2 in FIG. 3. When the pressure inside the PTO clutch cylinder 5 reaches a predetermined pressure P2 set by the relief valve 3, the relief valve 3 returns the pressure oil from the pump 1 to the tank 2. A predetermined pressure is maintained, and Fig. 4 corresponds to the pressure rise course described above.
As shown in the rotation speed curve S 1 , the rise in the rotation speed of the PTO shaft is gradual in the range R 1 .
Further, in the range R2 , the rise is configured to be somewhat steep.
又、切替弁Ａを、絞り６からの油路８がPTO
クラツチシリンダ５にのみ連通する位置に切替え
れば、昇圧コントロール弁７と１時逃がし弁１７
への油路は、上記油路８に対して遮断されること
になつて、PTOクラツチ切替弁４をクラツチ接
続位置に切替えれば、ポンプ１の圧力油は１時に
PTOクラツチシリンダ５に供給されてPTOクラ
ツチ２４は直ちに接続されることになる。 Also, when switching valve A, oil passage 8 from throttle 6 is connected to PTO.
If the position is changed to communicate only with the clutch cylinder 5, the boost control valve 7 and the 1 o'clock relief valve 17 will be closed.
When the PTO clutch switching valve 4 is switched to the clutch connected position, the pressure oil of the pump 1 is turned off at 1 o'clock.
The PTO clutch cylinder 5 is supplied and the PTO clutch 24 is immediately connected.
そして、ミツシヨンケース２５への取付位置の
一例は、第１図に示すようにリリーフ弁３と
PTOクラツチ切替弁４を内装しているフローデ
バイダ２６を変速操作レバー２７の附近に取付け
て、このPTOクラツチ切替弁４は、電磁ソレノ
イド４ａによつて切替えを行うように形成し、
又、切替弁Ａはフローデバイダ２６の近くのミツ
シヨンケース２５の上面に取付け、昇圧コントロ
ール弁７と１時逃がし弁１７を内装しているカー
トリツジタイプの弁箱２８のねじ部２８ａを切替
弁Ａに取付けて、油路８からこの弁箱２８に連通
するように設けた油路２９に弁体３０をのぞませ
て、ばね３１にて弁体３０は油路２９を状態にお
いては開くようにして、弁体３０の係止部３０ａ
が切替弁Ａの係止部３２に係止するように弁体３
０を押込めば、弁体３０によつて油路２９が油路
８から遮断されることになるようこの切替弁Ａを
形成している。尚、ポンプ１の圧力油は、分流弁
３３にて分岐されて、コントロールバルブ３４を
介してトラクタに既設されている作業機昇降機構
３５のリフトシリンダ３６にも供給されるもので
ある。 An example of the attachment position to the mission case 25 is as shown in FIG.
A flow divider 26 containing a PTO clutch switching valve 4 is installed near the speed change operation lever 27, and the PTO clutch switching valve 4 is formed to be switched by an electromagnetic solenoid 4a.
The switching valve A is installed on the upper surface of the mission case 25 near the flow divider 26, and the threaded portion 28a of the cartridge type valve box 28, which houses the boost control valve 7 and the one-hour relief valve 17, is connected to the switching valve. The valve element 30 is attached to the oil passage 29 connected to the valve box 28 from the oil passage 8, and the valve body 30 is opened by the spring 31 when the oil passage 29 is in the state. Then, the locking portion 30a of the valve body 30
the valve body 3 so that it is locked in the locking part 32 of the switching valve A.
This switching valve A is formed so that when the switch 0 is pushed in, the oil passage 29 is shut off from the oil passage 8 by the valve body 30. Note that the pressure oil from the pump 1 is branched at a branch valve 33 and is also supplied via a control valve 34 to a lift cylinder 36 of a working machine lifting mechanism 35 already installed in the tractor.
この発明に係るPTOクラツチの作動油圧制御
装置は上述のとおり構成しているので、切替弁Ａ
を昇圧コントロール弁７が動作する位置に切替え
て所定のPTOクラツチ接続操作をすれば、PTO
クラツチシリンダ５に供給される圧力油は緩やか
に増大してPTOクラツチ２５緩やかに接続され
ることになつて、例えばモア作業の如く作業部の
慣性の大きい作業機の場合には、起動の際の衝撃
力を緩和することができて、安全ピン切断等の問
題が解消されることになり、逆に、PTOクラツ
チ２５の緩やかな接続動作を排除すべき例えばロ
ータリ耕耘機を連結したときは、切替弁Ａを、昇
圧コントロール弁７が非動作となる位置に切替え
れば良いものであつて、夫々の作業機に容易に対
応できるのである。 Since the PTO clutch hydraulic pressure control device according to the present invention is configured as described above, the switching valve A
If you switch the pressure control valve 7 to the position where it operates and perform the specified PTO clutch connection operation, the PTO
The pressure oil supplied to the clutch cylinder 5 gradually increases and the PTO clutch 25 is gradually connected, so that, for example, in the case of a working machine with a large inertia of the working part, such as a mower, when starting It is possible to reduce the impact force and eliminate problems such as safety pin breakage.On the other hand, when connecting a rotary tiller, for example, when connecting a rotary tiller, it is necessary to switch All that is required is to switch the valve A to a position where the pressure increase control valve 7 is inactive, and this can be easily applied to each working machine.
図はこの発明の一実施例を示すもので、第１図
はトラクタのミツシヨンケースの一部を切欠した
要部側面図、第２図は油圧回路図、第３図は
PTOクラツチシリンダ内の油圧の上昇図、第４
図はPTOシヤフトの回転速度上昇図である。
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、４
ａ……電磁ソレノイド、５……PTOクラツチシ
リンダ、６，１４……絞り、７……昇圧コントロ
ール弁、８，９，２９……油路、１０……戻しポ
ート、１１……塞ぎ部、１３，１５，２３……弁
室、１６，１９，３１……ばね、１７……１時逃
がし弁、１８……ストツパ、２０……弁棒、２２
……調節ねじ、２４……PTOクラツチ、２５…
…ミツシヨンケース、２６……フローデバイダ、
２７……変速操作レバー、２８……弁箱、２８ａ
……ねじ部、３０……弁体、３０ａ，３２……係
止部、３３……分流弁、３４……コントロールバ
ルブ、３５……作業機昇降機構、３６……リフト
シリンダ。
The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view of the essential parts of a tractor transmission case, Fig. 2 is a hydraulic circuit diagram, and Fig. 3 is a hydraulic circuit diagram.
Hydraulic pressure rise diagram in PTO clutch cylinder, 4th
The figure shows the increase in rotational speed of the PTO shaft. Explanation of symbols, 1...pump, 2...tank, 3...
...Relief valve, 4...PTO clutch switching valve, 4
a... Electromagnetic solenoid, 5... PTO clutch cylinder, 6, 14... Throttle, 7... Boost control valve, 8, 9, 29... Oil passage, 10... Return port, 11... Blocking part, 13 , 15, 23... Valve chamber, 16, 19, 31... Spring, 17... 1 o'clock relief valve, 18... Stopper, 20... Valve stem, 22
...Adjustment screw, 24...PTO clutch, 25...
...Mission case, 26...Flow divider,
27...Speed control lever, 28...Valve box, 28a
. . . Threaded portion, 30 . . . Valve body, 30a, 32 .
Claims (1)
到る油路の途中に分流弁を設け、この分流弁から
PTOクラツチシリンダに到る油路の途中に、こ
のPTOクラツチシリンダに供給する作動圧力油
の油圧を制御できる昇圧コントロール弁を設け、
この昇圧コントロール弁を、動作又は非動作の
夫々に切替えできる切替弁を設けてなるPTOク
ラツチの作動油圧制御装置。1 A diversion valve is installed in the middle of the oil path from the pump to the lift cylinder for lifting and lowering the work equipment, and from this diversion valve
A boost control valve is installed in the oil path leading to the PTO clutch cylinder to control the hydraulic pressure of the working pressure oil supplied to the PTO clutch cylinder.
This hydraulic pressure control device for a PTO clutch is provided with a switching valve that can switch the boost control valve into operation or non-operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57170712A JPS5962730A (en) | 1982-09-29 | 1982-09-29 | Hydraulic pressure control device for pto clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57170712A JPS5962730A (en) | 1982-09-29 | 1982-09-29 | Hydraulic pressure control device for pto clutch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5962730A JPS5962730A (en) | 1984-04-10 |
| JPH0450211B2 true JPH0450211B2 (en) | 1992-08-13 |
Family
ID=15909996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57170712A Granted JPS5962730A (en) | 1982-09-29 | 1982-09-29 | Hydraulic pressure control device for pto clutch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5962730A (en) |
-
1982
- 1982-09-29 JP JP57170712A patent/JPS5962730A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5962730A (en) | 1984-04-10 |
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