JPS6136520A - Selector valve for hydraulic clutch - Google Patents

Selector valve for hydraulic clutch

Info

Publication number
JPS6136520A
JPS6136520A JP15696884A JP15696884A JPS6136520A JP S6136520 A JPS6136520 A JP S6136520A JP 15696884 A JP15696884 A JP 15696884A JP 15696884 A JP15696884 A JP 15696884A JP S6136520 A JPS6136520 A JP S6136520A
Authority
JP
Japan
Prior art keywords
valve
spool
hydraulic pressure
internal passage
liquid
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.)
Pending
Application number
JP15696884A
Other languages
Japanese (ja)
Inventor
Toshihiro Yasui
安井　利浩
Susumu Onoda
小野田　晋
Hirokazu Enomoto
博計 榎本
Naoto Sato
直人 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Univance Corp
Original Assignee
Fuji Tekko Co Ltd
Fuji Iron Works Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Tekko Co Ltd, Fuji Iron Works Co Ltd filed Critical Fuji Tekko Co Ltd
Priority to JP15696884A priority Critical patent/JPS6136520A/en
Publication of JPS6136520A publication Critical patent/JPS6136520A/en
Pending legal-status Critical Current

Links

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
    • 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

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)

Abstract

PURPOSE:To improve response performance by incorporating a reducing valve for reducing the liquid pressure supplied from a hydraulic source to a certain hydraulic pressure and feeding the liquid pressure, when a hydraulic clutch selecting valve is in OFF state, into an internal passage formed into the spool of the selector valve. CONSTITUTION:An internal passage 12 is formed in the axial direction inside a spool 7 urged to an OFF position by a return spring 8 in a valve chamber 2. The right side of the internal passage 12 is closed by a plug 13, and the left side communicates to the edge surface through a communication hole 14. A plunger 16 pressed by a decompression setting spring 15 is incorporated into the internal passage 12, and the passages 17 and 19 for the flow of the liquid from a pump port 3 to a load port 6 on the both sides of the internal passage formed in the gap between the rand parts 18 and 18' are formed onto the spool 7. Further, the hydraulic pressure of the load port 6 is applied into the liquid chamber outside the rand part 18 on the right side of the plunger 16 through a liquid passage 20.

Description

【発明の詳細な説明】 （産業上利用分野） 本発明は、オートマチックトランスミッションの液圧ク
ラッチｖ４置の液圧ｔａ換えに使用される液圧クラッチ
用切操弁に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic clutch control valve used for changing the hydraulic pressure of the hydraulic clutch V4 in an automatic transmission.

（従来技術） 従来、トラクタ等のオートマチックトランスミッション
では、シフト操作時のギア切換に液圧クラッチを使用し
ており、この液圧クラッチはクラッチピストンに作動液
圧を供給することでクラッチを接続し、作動液圧をドレ
イン側に抜くことでクラッチを切り離しており、この作
動液圧の切換えに電磁ソレノイドによるスプールの移動
で液圧供給をオン、オフする切換弁を使用している。(Prior art) Conventionally, automatic transmissions such as tractors use hydraulic clutches to change gears during shift operations.This hydraulic clutch connects the clutch by supplying hydraulic pressure to the clutch piston. The clutch is disengaged by releasing the hydraulic pressure to the drain side, and a switching valve is used to switch the hydraulic pressure by turning the hydraulic pressure supply on and off by moving a spool using an electromagnetic solenoid.

ところで、切換弁により作動する液圧クラッチにおいて
は、クラッチを切り離すためにクラッチピストンの液圧
室を切換弁を介してドレイン側に接続した場合、クラッ
チ切離し模にピストン液圧室とドレインとのレベル差に
よってピストン液圧室から液が扱は出してしまい、次に
１／］１１Ｊ弁のオンで液圧を供給したときに、ピスト
ン液圧室に液を充満させてから液圧がクラッチピストン
に加わるため、ピストン液圧室に液を充満させる分だけ
りラッチピストンの作動が匠れるという問題があった。By the way, in a hydraulic clutch operated by a switching valve, when the hydraulic pressure chamber of the clutch piston is connected to the drain side via the switching valve in order to disengage the clutch, the level between the piston hydraulic pressure chamber and the drain increases when the clutch is disengaged. Due to the difference, fluid flows out from the piston hydraulic pressure chamber, and then when the 1/]11J valve is turned on and hydraulic pressure is supplied, the piston hydraulic pressure chamber is filled with fluid, and then the hydraulic pressure is applied to the clutch piston. Therefore, there was a problem in that the operation of the latch piston was affected by the amount of liquid filling the piston hydraulic pressure chamber.

（発明の目的） 本発明は、このような従来の問題点に鑑みてなされたも
ので、弁オフ時に負荷となるクラッチピストン側に減圧
した液圧を供給し、クラッチ接続し状態にあってもクラ
ッチピストン液圧室、に常に液を充満させ、弁オン時の
クラッチ接続の応答性を向上するようにした液圧クラッ
チ用切換弁を提供することを目的とする。(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and it supplies reduced hydraulic pressure to the clutch piston side, which is the load when the valve is off, so that even when the clutch is engaged, It is an object of the present invention to provide a switching valve for a hydraulic clutch in which a clutch piston hydraulic pressure chamber is always filled with liquid to improve responsiveness of clutch connection when the valve is turned on.

（発明の構成） この目的を達成するため本発明は、電磁ソレノイドによ
るスプールの切換でクラッチピストンへの供給液圧をオ
ン、オフする液圧クラッチ用切換弁において、バルブボ
ディの弁室にリターンスプリングでオフ位置に付勢され
たスプールを摺動自在に設け、このスプールに内部通路
を形成すると共に内部通路に弁オフ時に液圧源からの液
圧を一定液圧に減圧して供給する減圧弁を組込み、切換
弁をオフに切換えても液圧クラッチピストンの液圧至に
減圧した液圧を供給して常時液を充満させておくように
したしのである。(Structure of the Invention) To achieve this object, the present invention provides a switching valve for a hydraulic clutch that turns on and off hydraulic pressure supplied to a clutch piston by switching a spool using an electromagnetic solenoid. A pressure reducing valve is provided with a slidable spool biased to the off position, an internal passage is formed in the spool, and the internal passage is supplied with the liquid pressure from the liquid pressure source reduced to a constant liquid pressure when the valve is turned off. By incorporating this, even when the switching valve is turned off, a reduced hydraulic pressure is supplied to the hydraulic clutch piston to keep it filled with liquid at all times.

（実施例） 第１図は本発明の一実施例を示した断面図である。(Example) FIG. 1 is a sectional view showing an embodiment of the present invention.

まず構成を説明すると、１はバルブボディであり、内部
に軸方向の弁室２を形成し、弁室２に対しポンプボート
３．ドレインボート４．５及び液圧クラッチを接続する
負荷ボート６を形成している。First, to explain the structure, 1 is a valve body, which has an axial valve chamber 2 formed therein, and a pump boat 3. It forms a drain boat 4.5 and a load boat 6 to which a hydraulic clutch is connected.

弁室２にはスプール７がリターンスプリング（３による
押圧をもっては動自在に組み込まれ、図示のオフ状態で
弁室２に嵌着したスナップリング９への当接で位が決め
されている。A spool 7 is built into the valve chamber 2 so as to be movable under the pressure of a return spring (3), and its position is determined by contact with a snap ring 9 fitted in the valve chamber 2 in the OFF state shown.

スプール７は軸方向に分離されたスプールランド１０．
１１を有し、内部に軸方向の内部通路１２を形成し、内
部通路１２の右側はプラグ１３の固着で閉鎖され、内部
通路１２の左側は連通穴１４で端面に連通されている。The spool 7 has axially separated spool lands 10.
11, an axial internal passage 12 is formed therein, the right side of the internal passage 12 is closed by fixing a plug 13, and the left side of the internal passage 12 is communicated with the end face through a communication hole 14.

内部通路１２には、減圧設定スプリング１５で押圧され
たプランジャ１６が組み込まれ、プランジャ１６は軸方
向の２ケ所に内部通路１２に謂接するランド部１８．１
８′を有し、ランド部１８と１８゛の間のｍ間で形成さ
れる内部通路の両側にポンプボート３から負荷ボート６
へ液を流すための通路１７．１９をスプール７に設け、
更に負荷ボート６の液圧を液通路２０を介してプランジ
ャ１６における右側のランド部１８の外側の液交に加え
るようにしている。更に、負荷ボート６からリターンス
プリング８を収納した弁室２の流路にはスプリング２１
で押圧されたボール弁２２をもつチェック弁Ｗ　ｇＨが
設けられている。A plunger 16 pressed by a pressure reduction setting spring 15 is incorporated into the internal passage 12, and the plunger 16 has land portions 18.1 that contact the internal passage 12 at two locations in the axial direction.
8', and the pump boat 3 to the load boat 6 on both sides of the internal passage formed between the lands 18 and 18'.
A passage 17.19 is provided in the spool 7 for flowing liquid to the spool 7,
Further, the hydraulic pressure of the load boat 6 is applied to the liquid exchange outside the right land portion 18 of the plunger 16 via the liquid passage 20. Furthermore, a spring 21 is installed in the flow path of the valve chamber 2 that accommodates the return spring 8 from the load boat 6.
A check valve W gH is provided with a ball valve 22 pressed at .

次に、スプール７の左側に組み込まれた電磁ソレノイド
により作動するパイロット弁の構造を説明する。Next, the structure of the pilot valve operated by the electromagnetic solenoid built into the left side of the spool 7 will be explained.

まず、パイロット弁は一対のバルブシール２３゜２４を
弁部材２５の３ケ所に軸方向に形成した通し穴２５ａを
貫通した支持アーム２９の両端への！！着で連動して軸
方向に移動できるように設けており、バルブシール２３
．２４のそれぞれに相対して、弁部材２５にはオリフィ
ス通路２６．２７が形成され、オリフィス通路２６は連
絡ボート２８を介してポンプボート３に接続され、一方
、オリフィス通路２７はドレインボート５に連通され又
いる。外側に位置するバルブシール２３には電磁ソレノ
イド３０のオン、オフで移動するプランジャ３２が固定
され、第１図の弁オフ時には電磁ソレノイド３０は非通
電状態にあり、プランジャ３２はスプリングの叩圧でバ
ルブシール２３を押「してＡリフイス通路２６の間口部
をＩＷｌ鎖し、バルブシール２４の移動でオリフィス通
路２７側を聞いた状態としている。勿論、電磁ソレノイ
ド３０に通電すると、プランジャ３２は左側に駆動され
、パルプシール２４でオリフィス通路２７を閉じると共
に、バルブシール２３が離れることでオリフィス通路２
６を開くようになる。First, the pilot valve has a pair of valve seals 23 and 24 attached to both ends of a support arm 29 that passes through through holes 25a formed in three locations in the axial direction of the valve member 25! ! The valve seal 23 is provided so that it can move in the axial direction in conjunction with the
．． 24 , an orifice passage 26 , 27 is formed in the valve member 25 , the orifice passage 26 being connected to the pump boat 3 via a connecting boat 28 , while the orifice passage 27 communicating with the drain boat 5 . There is another. A plunger 32 that moves when the electromagnetic solenoid 30 is turned on and off is fixed to the valve seal 23 located on the outside. When the valve is turned off as shown in FIG. The valve seal 23 is pressed to close the frontage of the A-refice passage 26, and the valve seal 24 is moved to open the orifice passage 27 side.Of course, when the electromagnetic solenoid 30 is energized, the plunger 32 is moved to the left side. , the pulp seal 24 closes the orifice passage 27, and the valve seal 23 separates, causing the orifice passage 2 to close.
6 will be opened.

次に、上記の実施例の動作を説明する。Next, the operation of the above embodiment will be explained.

第１図に示すオフ状態で切換弁の電磁−ソレノイド３０
に通電す゛ると、プランジャ３２が左−側に駆動され、
このプランジャ３２の駆動でバルブシール２３が弁部材
２５のオリフィス通路２６を開くと共に支持アーム２９
を介して連結したバルブシール２４の移動でオリフィス
通路２７をｖ１１ｔＲシ、第２図に示すバイロット弁の
動作状態となる。The electromagnetic solenoid 30 of the switching valve in the off state shown in FIG.
When energized, the plunger 32 is driven to the left side,
When the plunger 32 is driven, the valve seal 23 opens the orifice passage 26 of the valve member 25 and the support arm 29 opens.
The movement of the valve seal 24, which is connected through the valve seal 24, opens the orifice passage 27 to the operating state of the pilot valve shown in FIG.

このため、ポンプポート３からの液圧は連絡ポート２８
を介して弁部材２５のオリフィス通路２６より左側のパ
イロット室に流れ込み、更に支持アーム２９を貫通した
連通穴２５ａを介して右側パイロット室にも作用し、ス
プール７の左端に液圧を加えることでリターンスプリン
グ８に抗してスプール７を右側に移動°丈る。このスプ
ール７の右側への移動でポンプボート３が負荷ポート６
に連絡され、ポンプボート３よりの液圧をＰ４伺ボート
６から液圧クラッチにおけるクラッチピストンの液圧室
に供給し、クラッチピストンの駆動でクラッチ接続状態
を作り出す。Therefore, the hydraulic pressure from pump port 3 is transferred to communication port 28.
It flows from the orifice passage 26 of the valve member 25 into the left pilot chamber through the orifice passage 26 of the valve member 25, and also acts on the right pilot chamber through the communication hole 25a penetrating the support arm 29, applying hydraulic pressure to the left end of the spool 7. Move the spool 7 to the right against the return spring 8. This movement of the spool 7 to the right moves the pump boat 3 to the load port 6.
The hydraulic pressure from the pump boat 3 is supplied from the P4 boat 6 to the hydraulic pressure chamber of the clutch piston in the hydraulic clutch, and the clutch piston is driven to create a clutch connected state.

次に、第２図に示す弁オフ状態で電磁ソレノイド３０へ
の通電をｗｉｔ、、、たとすると、第３図に示すように
、第１図と同様にプランジャ３２がスプリングにより押
し戻され、バルブシール２３でオリフィス通ｊｆ１２６
を閉じると共に支持アーム２９を介してバルブシール２
４を移動してオリフィス通路２７を聞き、オリフィス通
路２７を介してスプール７の左側の液室をドレインポー
ト５に連通ずる。このため、スプール７はリターンスプ
リング８の力でスナップリング９に当接するオフ位置に
戻され、ポンプボート３と負荷ボート６を遮断する。こ
のとき、負荷ボート６にクラッチピストンより加わりて
いる液圧はボール弁２２をスプリング２１に抗して聞き
、リターンスプリング８の組込み部分を通ってドレイン
ポート４へ扱かれる。Next, when the electromagnetic solenoid 30 is energized with the valve off as shown in FIG. 2, the plunger 32 is pushed back by the spring as shown in FIG. 23 through orifice jf126
and close the valve seal 2 via the support arm 29.
4 to listen to the orifice passage 27, and communicate the liquid chamber on the left side of the spool 7 to the drain port 5 via the orifice passage 27. Therefore, the spool 7 is returned to the off position where it contacts the snap ring 9 by the force of the return spring 8, and the pump boat 3 and the load boat 6 are cut off. At this time, the hydraulic pressure applied to the load boat 6 from the clutch piston is heard by the ball valve 22 against the spring 21, and is handled to the drain port 4 through the part where the return spring 8 is incorporated.

一方、負荷ボート６に加わるクラッチピストンからの液
圧は連通路２０を通ってスプール７の内部通路１２に設
けたプランジャ１６の右端の液室に加わり、このときプ
ランジャ１６の左側の液室は連通穴１４を介してドレイ
ンポート５に連通しているため、プランジャ１６のラン
ド部１８に加わる負荷側の液圧で減圧設定スプリング１
５を圧縮してプランジｔｙ１６は左側に移動し、プラン
ジャ１６のランド部１８がスプール７の負荷ボート６に
対する通路１９に位置し、ランド部１８と通路１９との
間にオリフィスを形成し、このオリフィスの形成による
減圧で負荷ボート６に対しポンプボート３の液圧を所定
割合だけ減圧して供給するようになり、弁オフ状態にお
いて、減圧設定スプリング１５．プランジャ１６で構成
された減圧弁で減圧しだ液圧を負荷ボート６を介してク
ラッチピストンの液圧室に供給するようになり、クラッ
チピストンの液圧室を常時、液の充満した状態に保つ。On the other hand, the hydraulic pressure from the clutch piston applied to the load boat 6 passes through the communication passage 20 and is applied to the liquid chamber at the right end of the plunger 16 provided in the internal passage 12 of the spool 7. At this time, the liquid chamber on the left side of the plunger 16 is in communication. Since it communicates with the drain port 5 through the hole 14, the pressure reduction setting spring 1 is activated by the hydraulic pressure on the load side that is applied to the land portion 18 of the plunger 16.
5 is compressed, the plunger ty16 moves to the left, and the land portion 18 of the plunger 16 is located in the passage 19 for the load boat 6 of the spool 7, forming an orifice between the land portion 18 and the passage 19, and this orifice Due to the pressure reduction caused by the formation of , the hydraulic pressure of the pump boat 3 is reduced by a predetermined proportion and supplied to the load boat 6, and in the valve off state, the pressure reduction setting spring 15. The pressure is reduced by a pressure reducing valve composed of a plunger 16, and the hydraulic pressure is supplied to the hydraulic pressure chamber of the clutch piston via the load boat 6, so that the hydraulic pressure chamber of the clutch piston is always kept filled with liquid. .

従って、第３図に示す切換弁のオフ状態から再び電磁ソ
レノイド３０に通電し、スプール７の右側への移動でポ
ンプボート３より負荷ボート６に液圧を供給すると、ク
ラッチピストンの液圧室は液を充満した状態におかれる
ため、切換弁をオンしたことによる液圧が直ちにクラッ
チピストンの液圧室に作用し、クラッチピストンを速や
かに駆動してクラッチ接続状態を作り出すことが″でき
る。Therefore, when the electromagnetic solenoid 30 is energized again from the off state of the switching valve shown in FIG. 3, and hydraulic pressure is supplied from the pump boat 3 to the load boat 6 by moving the spool 7 to the right, the hydraulic pressure chamber of the clutch piston is Since it is filled with liquid, the hydraulic pressure caused by turning on the switching valve immediately acts on the hydraulic pressure chamber of the clutch piston, and the clutch piston can be quickly driven to create a clutch connected state.

（発明の効果） 以上説明してきたように本発明によれば、Ｎｍソレノイ
ドによるス／−ルの作動Ｃ負荷に対ジる液圧供給をオン
、オフする液圧クラッチ用切換弁において、パルプボデ
ィの弁室にリターンスプリングで１７位ぼに付勢された
スプールを摺初自在に設け、このスプールに内部通路を
形成すると共に、内部通路に弁オフ時に液圧源からの液
圧を一定液圧に減バして供給する減圧弁を組み込むよう
にしたため、クラッチピストンの液圧室をトレイン側に
接続してクラッチ切り離し状態を作り出す弁オフ時に、
切換弁より減圧した液圧を常時、クラッチピストンの液
圧室に供給することができ、ピストン液圧室とドレイン
側のレベル差によりピストン液圧室から液が抜は出して
も、切換弁より減圧した液を常時補充して、常に液を充
満した状態に保つことができ、次に弁のＡン作動でクラ
ッチ接続を行なったときの応答性を大幅に向上すること
ができる。(Effects of the Invention) As described above, according to the present invention, in the switching valve for a hydraulic clutch that turns on and off the hydraulic pressure supply to the operation C load of the throttle/spool by the Nm solenoid, the pulp body A spool that is biased to about 17 degrees by a return spring is slidably installed in the valve chamber of the valve chamber, and an internal passage is formed in this spool. By incorporating a pressure reducing valve that reduces and supplies pressure to
Hydraulic pressure reduced by the switching valve can be constantly supplied to the hydraulic pressure chamber of the clutch piston. By constantly replenishing the reduced pressure fluid, the fluid can be kept in a full state at all times, and the response when the clutch is next engaged by the valve A-on operation can be greatly improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を弁オフ状態で示した断面図
、第２図は弁オン状態を示した断面図、第３図は弁Ａフ
状態におけるスプール内部通路に設けた減圧弁の動作状
態を示した断面図ある。 １：バルブボディ ２：弁室 ３：ポンプボート ４．５；ドレインボート ６：負荷ボート ７：スプール ８：リターンスプリング ９ニスナツプリング １０．１１ニスプールランド １２：内部通路 １３ニブラグ部材 １４：連通穴 １５：減圧設定スプリング １６：プランジャ １８．１８′：ランド部 １７．１９：通路 ２０：液通路 ２１ニスプリング ２２：ボール弁 ２３．２４：バルブシール ２５：弁部材 ２６：支持アーム ２７．２８ニオリフイス通路 ２９：支持アーム ３０：電磁ソレノイド ３２ニブランジヤFig. 1 is a sectional view showing an embodiment of the present invention in the valve off state, Fig. 2 is a sectional view showing the valve on state, and Fig. 3 is a pressure reducing valve provided in the spool internal passage in the valve A off state. There is a sectional view showing the operating state of the device. 1: Valve body 2: Valve chamber 3: Pump boat 4.5; Drain boat 6: Load boat 7: Spool 8: Return spring 9 Varnish nut spring 10.11 Varnish spool land 12: Internal passage 13 Nib lug member 14: Communication hole 15: Pressure reduction setting spring 16: Plunger 18. 18': Land portion 17. 19: Passage 20: Liquid passage 21 Spring 22: Ball valve 23. 24: Valve seal 25: Valve member 26: Support arm 27. 28 Niorifice passage 29: Support arm 30: Electromagnetic solenoid 32 nib plunger

Claims (1)

【特許請求の範囲】[Claims] 電磁ソレノイドによるスプールの作動で負荷に対する液
圧供給をオン、オフする切換弁において、バルブボディ
と、該バルブボディの弁室に摺動自在に設けたスプール
と、該スプールをオフ位置に復旧させるリターンスプリ
ングとを有し、前記スプールに内部通路を形成し、該内
部通路に弁オフ時に液圧源からの液圧を一定液圧に減圧
して負荷に供給する減圧弁を設けたことを特徴とする液
圧クラッチ用切換弁。A switching valve that turns on and off hydraulic pressure supply to a load by operating a spool using an electromagnetic solenoid, includes a valve body, a spool slidably provided in a valve chamber of the valve body, and a return that restores the spool to the off position. The spool has a spring, an internal passage is formed in the spool, and the internal passage is provided with a pressure reducing valve that reduces the hydraulic pressure from the hydraulic pressure source to a constant hydraulic pressure and supplies it to the load when the valve is turned off. A switching valve for hydraulic clutches.
JP15696884A 1984-07-27 1984-07-27 Selector valve for hydraulic clutch Pending JPS6136520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15696884A JPS6136520A (en) 1984-07-27 1984-07-27 Selector valve for hydraulic clutch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15696884A JPS6136520A (en) 1984-07-27 1984-07-27 Selector valve for hydraulic clutch

Publications (1)

Publication Number Publication Date
JPS6136520A true JPS6136520A (en) 1986-02-21

Family

ID=15639255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15696884A Pending JPS6136520A (en) 1984-07-27 1984-07-27 Selector valve for hydraulic clutch

Country Status (1)

Country Link
JP (1) JPS6136520A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03163225A (en) * 1989-11-20 1991-07-15 Zexel Corp Directional control valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03163225A (en) * 1989-11-20 1991-07-15 Zexel Corp Directional control valve

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