JPH0545350U - Automatic three-way switching valve for backhoe mounting work equipment - Google Patents
Automatic three-way switching valve for backhoe mounting work equipmentInfo
- Publication number
- JPH0545350U JPH0545350U JP11101491U JP11101491U JPH0545350U JP H0545350 U JPH0545350 U JP H0545350U JP 11101491 U JP11101491 U JP 11101491U JP 11101491 U JP11101491 U JP 11101491U JP H0545350 U JPH0545350 U JP H0545350U
- Authority
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- Prior art keywords
- port
- valve
- way switching
- switching valve
- valve body
- Prior art date
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- Operation Control Of Excavators (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
(57)【要約】
【目的】バックホーなどの作業台車に取付け該作業台車
から油圧の供給を受けて使用する作業機具の油圧配管系
統に設け、作業機具からの戻り油がタンクへのバイパス
用分岐路に流れるように切換える三方切換弁において、
管路内を流れる油圧によって自動的に三方切換弁を切り
換え、手動切換を不要にする。
【構成】三方切換弁の内部に前後に摺動可能に案内指示
した弁体の一端に配置したスプリングの復元力によって
弁体をポート１Ａ側に付勢当接させ、通常はポート１Ａ
を前記弁体で閉塞すると共にポート１Ｂと１Ｃとを連通
し、ポート１Ａに高圧が作用したときはこの高圧が前記
スプリングの力に打ち勝って弁体を押し、弁体でポート
１Ｃを閉塞すると共にポート１Ａと１Ｂとを連通させ
る。
(57) [Summary] [Purpose] It is installed on a work trolley such as a backhoe and installed in the hydraulic piping system of the work implement that receives hydraulic pressure from the work trolley, and the return oil from the work implement is branched to the tank for bypass. In a three-way switching valve that switches so that it flows to the road,
The three-way switching valve is automatically switched by the hydraulic pressure flowing in the pipeline, eliminating the need for manual switching. [Structure] The valve body is biased and abutted toward the port 1A side by the restoring force of a spring arranged at one end of the valve body that is slidably guided back and forth inside the three-way switching valve.
Is closed by the valve body and the ports 1B and 1C are communicated with each other. When a high pressure acts on the port 1A, the high pressure overcomes the force of the spring to push the valve body, and the valve body closes the port 1C. Connect ports 1A and 1B.
Description
【０００１】[0001]
この考案は、バックホーなど作業台車のアームの先端に取付け、作業台車側か ら油圧の供給を受けて作動する作業機具用油圧配管系統の回路切換弁に関するも のである。 The present invention relates to a circuit switching valve of a hydraulic piping system for a working implement that is attached to the tip of an arm of a work truck such as a backhoe and operates by receiving hydraulic pressure from the work truck side.
【０００２】[0002]
バックホーなどの作業台車に作業機具を取付けて使用する場合、例えばこの作 業機具が油圧ブレーカーの場合、ブレーカーの作動油圧の供給側と戻り側は常に 定まっており、油圧管路内の油の流れる方向を切換る必要はないが、ブレーカー 以外の例えば圧砕機、掴み機、切断機等の作業機具につけ換えて使用する場合、 これらの作業機具のアクチュエーターの作動方向は可逆式のため、油圧管路内の 油の流れる方向を交互に切換る必要がある。 When a work implement is attached to a work trolley such as a backhoe, for example, when this work implement is a hydraulic breaker, the supply side and the return side of the operating pressure of the breaker are always fixed, and the oil flow in the hydraulic pipeline. It is not necessary to switch the direction, but when using it by replacing it with a work tool other than a breaker, such as a crusher, a grinder, or a cutting machine, the operating direction of the actuator of these work tools is reversible, so the hydraulic pipeline It is necessary to alternately switch the direction of oil flow inside.
【０００３】 油圧ブレーカーでは、打撃力と打数を増すために戻り側の管路抵抗を極力少な くし、且つブレーカーからの戻り油に含まれる異物が作業台車の油圧回路内に侵 入するのを防ぐ必要があり、このためブレーカーからの戻り油は、図７に示すよ うにブレーカー１５からの戻り管路途中に手動切換式三方弁４０を設け、この三 方弁から分岐したバイパス管路を経由して油圧制御弁を経由せず直接タンクに戻 すようにし、このバイパス管路中に専用フィルターを設けるように構成するが、 ブレーカー以外の上記のような作業機具を取付けて使用する場合は、流量方向切 換弁１２で作業機具への油圧流入方向を交互に切換えて制御可能にするるため、 手動切換式三方弁４０の弁体を１８０°回転操作して回路の切換えを行う。In the hydraulic breaker, the pipe resistance on the return side is minimized in order to increase the striking force and the number of strikes, and foreign matter contained in the return oil from the breaker is prevented from entering the hydraulic circuit of the work truck. Therefore, the return oil from the breaker is provided with a manually switchable three-way valve 40 in the middle of the return line from the breaker 15 as shown in FIG. 7, and passes through a bypass line branched from this three-way valve. It is configured to return directly to the tank without passing through the hydraulic control valve, and a dedicated filter is installed in this bypass line.However, when using the above-mentioned working equipment other than the breaker, the flow rate In order to make it possible to control by alternately switching the hydraulic pressure inflow direction to the work implement by the direction switching valve 12, the valve body of the manual switching type three-way valve 40 is rotated 180 ° to switch the circuit.
【０００４】 従来この回路切換手段として、例えば図６に示すような断面構造の三方切換弁 ４０を用いてこれを図７に示すように配管接続し、この三方切換弁本体４１の内 部に収納され４２Ａ、４２Ｂ、４２Ｃの連通路を設けた弁体４２を本体４１内で １８０°左右に回転して、油圧が４０Ａから４０Ｂまたは４０Ｂから４０Ｃの各 ポートへ流れ、他の４０Ｃまたは４０Ａのポートを閉塞するようにしていた。Conventionally, as this circuit switching means, for example, a three-way switching valve 40 having a sectional structure as shown in FIG. 6 is used, and this is connected by piping as shown in FIG. 7, and is housed in the inside of this three-way switching valve main body 41. The valve body 42 provided with the communication passages of 42A, 42B, and 42C is rotated 180 degrees left and right in the main body 41, and the hydraulic pressure flows to each port of 40A to 40B or 40B to 40C, and the other 40C or 40A port. Was blocked.
【０００５】 ところが、上記のような方法では、ブレーカーと他の作業機具とをつけ換えて 使用するときはその都度この三方弁４０を手動操作して切換える必要が生じ、オ ペレーターがしばしばこの切換操作を忘れてしまい、作業機具が作動しなかった りブレーカーの能力が著しく低下したり、あるいは作業機具からの異物が台車側 の油圧システムに侵入し、これが循環して油圧機器を損傷するなどの不具合があ った。However, in the above-mentioned method, when the breaker and the other working implement are replaced with each other, it is necessary to manually operate the three-way valve 40 each time, and the operator often performs this switching operation. For example, the work equipment does not operate, the breaker's capacity is significantly reduced, or foreign matter from the work equipment enters the hydraulic system on the trolley side, which circulates and damages hydraulic equipment. was there.
【０００６】[0006]
本考案は、上記のような三方切換弁の切換操作忘れによる不具合をなくし、そ の都度オペレーターが手作業で三方切換弁の切換えを行わなくてもよいように、 バックホーなどの作業台車に取付けて使用する作業機具用油圧配管に用いる自動 切換式の三方弁を提供するものである。 The present invention eliminates the above-mentioned problems caused by forgetting the switching operation of the three-way switching valve, and installs it on a work truck such as a backhoe so that the operator does not have to manually switch the three-way switching valve each time. It is intended to provide an automatic switching type three-way valve for use in hydraulic piping for working equipment used.
【０００７】[0007]
上記問題解決のため、バックホウなどの作業台車のアームの先端に取付けた作 業機具と該作業機具制御用の流量方向制御弁との間を接続する往復の油圧配管の うち少なくとも一方の中間に三方切換弁を設け、前記作業機具からの戻り油を直 接タンクへバイパスが出来るように前記三方切換弁からタンクバイパス用分岐路 を設けた構成の油圧回路において、前記三方切換弁は、該三方切換弁の本体内部 で前後に摺動可能に案内支持された回路切換用弁体と該弁体の一端に配設したス プリングとを有し、該スプリングの復元力によって前記弁体を片側に付勢し、通 常は該弁体がこの位置で前記流量方向制御弁側のポートを閉塞すると共に、作業 機具側のポートを前記タンクバイパス用分岐路のポートと連通せしめ、また、前 記流量方向制御換弁側ポートに高圧が作用したときはこの高圧の油圧による推力 が前記スプリングの力に打ち勝って前記弁体を押し、該弁体が前記タンクバイパ ス用分岐路のポートを閉塞すると共に、流量方向制御弁側のポートと作業機具側 のボートとを連通せしめる位置に自動的に変位するように構成し、タンクバイパ ス用分岐路には専用フィルターを設ける。 In order to solve the above-mentioned problem, three-way in the middle of at least one of the reciprocating hydraulic pipes that connect between the work equipment attached to the tip of the arm of the work carriage such as a backhoe and the flow direction control valve for controlling the work equipment. In a hydraulic circuit having a switching valve and a tank bypass branch passage provided from the three-way switching valve so that the return oil from the work implement can be directly bypassed to the tank, the three-way switching valve is a three-way switching valve. The valve body has a circuit switching valve body slidably guided back and forth inside the main body of the valve and a spring disposed at one end of the valve body, and the valve body is attached to one side by the restoring force of the spring. Normally, the valve body closes the port on the flow direction control valve side at this position and connects the working tool side port with the port on the tank bypass branch passage. control When a high pressure is applied to the valve side port, the thrust due to this high hydraulic pressure overcomes the force of the spring and pushes the valve element, which closes the port of the tank bypass passage and controls the flow direction. It will be automatically displaced to a position where the valve side port and the work equipment side boat can communicate with each other, and a special filter will be installed on the tank bypass passage.
【０００８】[0008]
上記構成の配管系統と三方切換弁において、作業機具としてブレーカーを使用 した場合は、流量方向制御弁を操作すると高圧の油圧が自動三方切換弁を取付け ていない側の配管（以下これを管路Ａという）を通ってブレーカーに供給され、 ブレーカーを作動させた後、戻り油はもう一方の配管（以下これを管路Ｂという ）を通って自動三方切換弁を経由してタンクへのバイパス用分岐路（以下これを 管路Ｄという）を通ってタンクにバイパスされる。 When a breaker is used as a work tool in the piping system and the three-way switching valve configured as described above, when the flow direction control valve is operated, the high-pressure hydraulic pressure causes the piping on the side where the automatic three-way switching valve is not installed (hereinafter referred to as line A After being supplied to the breaker through the circuit breaker and actuating the breaker, the return oil passes through the other pipe (hereinafter referred to as pipe B) via the automatic three-way switching valve to the bypass branch to the tank. It is bypassed to the tank through a channel (hereinafter referred to as pipeline D).
【０００９】 また、ブレーカー以外の例えば油圧シリンダーの伸縮によって作動する圧砕機 等の作業機具に付け換えて使用した場合、流量方向制御弁を操作して圧砕機のア ームを閉じるときは、作動油は上記のブレーカーの場合と同じ順路で流れ、管路 Ａの油圧は圧砕機のアームシリンダーを押し出してアームを閉じるとき、戻り油 は流量方向制御弁を経由せずに管路Ｂ管路Ｄを通ってタンクに戻る。In addition, when it is used by replacing it with a working tool such as a crusher that operates by expansion and contraction of a hydraulic cylinder other than a breaker, when operating the flow direction control valve to close the arm of the crusher, it is activated. The oil flows in the same route as in the case of the above breaker, and when the hydraulic pressure in the pipeline A pushes out the arm cylinder of the crusher to close the arm, the return oil does not go through the flow direction control valve and the pipeline B pipeline D Return to the tank through.
【００１０】 そして、流量方向制御弁を操作して圧砕機のアームを開くときは、高圧作動油 は、流量方向制御弁から自動三方切換弁に至る管路（以下これを管路Ｃという） を通って自動三方切換弁の弁体を自己の圧力で押し、管路Ｄのポートを閉塞する と共に管路ＣとＢのポートを連通させ、この通路を通って管路Ｂから圧砕機のア ーム開閉シリンダーのピストンロッド側に供給されアームを開くとき、戻り油は 管路Ａを通って流量方向制御弁を中継してタンクに戻る。When the flow direction control valve is operated to open the arm of the crusher, the high-pressure hydraulic oil flows through a pipe line (hereinafter referred to as pipe line C) from the flow direction control valve to the automatic three-way switching valve. The valve body of the automatic three-way switching valve is pushed through by its own pressure to close the port of the pipeline D and the ports of the pipelines C and B are communicated with each other. When the arm is opened by being supplied to the piston rod side of the cylinder opening / closing cylinder, the return oil returns to the tank through the flow path A, relaying the flow direction control valve.
【００１１】 以上のように、この自動三方切換弁は、管路内を流れる油圧によって自動的に 回路が切換わる機能を有しているので、ブレーカーと他の作業機具とを作業台車 に付け換えて使用する場合、その都度オペレーターが切換える必要がなく、特別 な配慮をしなくても作業機具が正常に作動する。As described above, since the automatic three-way switching valve has a function of automatically switching the circuit by the hydraulic pressure flowing in the pipeline, the breaker and the other work equipment are replaced with the work carriage. The operator does not need to switch each time, and the work implement operates normally without special consideration.
【００１２】[0012]
【実施例】 以下図１から図４に基づいて本考案の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
【００１３】 自動三方切換弁１は、図１に示すように、右側面で開口する円筒形の空洞部２ Ａとこの２Ａに対して外側から貫通し且つこの空洞部２Ａ内で互いに連通する油 圧ポート１Ａ、１Ｂをそれぞれ左側面と左寄り上側面とに形成した本体２と、こ の本体２の空洞部２Ａに右側開口部からねじ込み装着され且つ後端には油圧ポー ト１Ｃを形成すると共に前方にはポート１Ｃと連通する弁体保持案内用円筒形空 洞部Ｇを有する段付きスリーブ３と、この空洞部Ｇ内で前後に摺動可能に収納さ れた弁体４と、この弁体４の後端には弁体４を本体１のポート１Ａ側に付勢し通 常はポート１Ａを弁体４で閉塞するスプリング５と、スリーブ３の外周に形成さ れたリング溝６に装着され本体２からの油漏れを阻止するシール材７とによって 構成される。As shown in FIG. 1, the automatic three-way switching valve 1 includes a cylindrical hollow portion 2A having an opening on the right side surface, and an oil which penetrates the hollow portion 2A from the outside and communicates with each other in the hollow portion 2A. A main body 2 having pressure ports 1A and 1B formed on the left side surface and an upper side surface on the left side, and a hollow portion 2A of the main body 2 is screwed and mounted from the right side opening, and a hydraulic port 1C is formed at the rear end. A stepped sleeve 3 having a cylindrical cavity G for holding and guiding the valve disc, which communicates with the port 1C in the front, a valve disc 4 slidably housed in the cavity G, and a valve 4 At the rear end of the body 4, there are a spring 5 for urging the valve body 4 toward the port 1A side of the body 1 and normally closing the port 1A with the valve body 4, and a ring groove 6 formed on the outer circumference of the sleeve 3. The seal member 7 is attached to prevent oil from leaking from the main body 2. Is made.
【００１４】 なお、段付きスリーブ３の前方空洞部Ｇの外径部３Ｃは、本体空洞部内径２Ａ より小さくして両者の間には隙間Ｓが形成され、且つこのスリーブ３の前方空洞 部Ｇの基端側近傍にはスリーブの半径方向に内外径を貫通する複数の油路３Ｈが 穿設されており、本体１のポート１Ｂとスリーブ３のポート１Ｃとが前記の隙間 Ｓ、油路３Ｈ、空洞部Ｇを介して連通するように構成されている。The outer diameter portion 3C of the front cavity portion G of the stepped sleeve 3 is smaller than the inner diameter 2A of the main body cavity so that a gap S is formed therebetween, and the front cavity portion G of the sleeve 3 is formed. A plurality of oil passages 3H penetrating the inner and outer diameters of the sleeve in the radial direction of the sleeve are formed in the vicinity of the base end side, and the port 1B of the main body 1 and the port 1C of the sleeve 3 have the above-mentioned gap S and the oil passage 3H. , So as to communicate with each other through the cavity G.
【００１５】 次に各構成部品の詳細構造について説明する。Next, the detailed structure of each component will be described.
【００１６】 本体２は、図１に示すように、右側面から円筒形の空洞部２Ａが穿設され、こ の空洞部２Ａの基端側には空洞部２Ａより大径の雌ネジ２Ｂを形成し、雌ネジ２ Ｂの先端部には２Ａとの直径差による平坦部２Ｃを形成し、且つ空洞部２Ａの先 端底部近傍には、油圧ポート１Ｂとして空洞部２Ａの半径方向に貫通孔２Ｇとこ の貫通孔の外側端には配管ねじ込み用雌ネジを形成すると共に、油圧ポート１Ａ として空洞部２Ａの先端底部中心に空洞部の中心線に沿って有底の穴２Ｄおよび この穴２Ｄより小径の貫通孔２Ｅを穿設し、貫通孔２Ｅの外側端に配管ねじ込み 用雌ネジを形成し、穴２Ｄと空洞部２Ａの底部２Ｈとの円周交点２Ｆが前記弁体 ４の前端側が当接する弁座となるようにする。As shown in FIG. 1, the main body 2 is provided with a cylindrical hollow portion 2A from the right side surface thereof, and a female screw 2B having a diameter larger than that of the hollow portion 2A is formed on the proximal end side of the hollow portion 2A. A flat portion 2C is formed at the tip of the female screw 2B due to the difference in diameter from 2A, and a hydraulic port 1B is formed in the radial direction of the cavity 2A in the vicinity of the bottom of the front end of the cavity 2A. 2G and a female screw for pipe screwing are formed on the outer end of this through hole, and a bottomed hole 2D and this hole 2D are formed along the center line of the hollow portion at the center of the bottom of the tip of the hollow portion 2A as a hydraulic port 1A. A small-diameter through hole 2E is bored, a female screw for screwing a pipe is formed at the outer end of the through hole 2E, and the circumferential intersection 2F between the hole 2D and the bottom 2H of the cavity 2A is in contact with the front end side of the valve body 4. Make sure the valve seat is in contact.
【００１７】 上記本体２の空洞部に対して右端の雌ネジ側から挿入してねじ込まれる所の段 付きのスリーブ３は、基端にスパナなどの工具を用いて本体２にねじ込み出来る ように外周に切り欠きを形成した鍔部ＨＸを有すると共にこの鍔部から先端に向 けて順次細くなる大径部３Ａ、中径部３Ｂ、小径部３Ｃを有し、大径部３Ａは外 周に本体の雌ネジ２Ｂと螺合する雄ネジを形成し、中径部３Ｂは外径が本体２の 空洞部の内径２Ａより若干小さく且つ外周の中間にシールリング溝６を形成し、 小径部３Ｃは後述の弁体４の大径部外径４Ａよりも若干大きめの内径３Ｄの空洞 Ｇを先端側から穿設すると共に小径部基端近傍にはこれらの内外径を貫通して半 径方向に複数の貫通孔３Ｈを穿設し、さらに、スリーブ３には中心線に沿って、 油圧ポート１Ｃとして鍔部外側端に形成した配管ねじ込み用雌ネジ穴から内部の 空洞Ｇに向けて貫通する貫通孔３Ｇを形成すると共に、この貫通孔３Ｇよりも大 径且つ空洞部の内径３Ｄより小径の有底の穴３Ｅを貫通孔３Ｇと同心に空洞Ｇの 側から貫通孔３Ｇの途中まで穿設し、穴３Ｅの底部は平坦部３Ｆを形成し、３Ｅ の空洞部Ｇに面した円形コーナー部３Ｉは後述の弁体４の後端側が当接する弁座 となるようにする。The stepped sleeve 3 which is inserted into and screwed into the hollow portion of the main body 2 from the female screw side at the right end has an outer periphery so that the base end can be screwed into the main body 2 by using a tool such as a spanner. It has a flange portion HX with a notch formed in it, and also has a large diameter portion 3A, a medium diameter portion 3B, and a small diameter portion 3C that gradually become thinner from this flange portion toward the tip, and the large diameter portion 3A is on the outer periphery of the main body. A male screw that is screwed into the female screw 2B of the main body 2 is formed, the outer diameter of the middle diameter portion 3B is slightly smaller than the inner diameter 2A of the hollow portion of the main body 2, and the seal ring groove 6 is formed in the middle of the outer periphery. A cavity G having an inner diameter 3D, which is slightly larger than the outer diameter 4A of the large diameter portion of the valve body 4 to be described later, is bored from the distal end side, and in the vicinity of the proximal end of the small diameter portion, a plurality of cavities G are penetrated through these inner and outer diameters in a semi-radial direction. A through hole 3H is formed on the sleeve 3, and the sleeve 3 is As a pressure port 1C, a through hole 3G penetrating from the female screw hole for screwing the pipe formed at the outer end of the flange portion toward the inner cavity G is formed, and the diameter is larger than the through hole 3G and the inner diameter 3D of the cavity portion. A small-diameter bottomed hole 3E is formed concentrically with the through hole 3G from the side of the cavity G to the middle of the through hole 3G, and the bottom of the hole 3E forms a flat portion 3F, which is a circular shape facing the cavity G of 3E. The corner portion 3I serves as a valve seat with which the rear end side of the valve body 4 described later abuts.
【００１８】 また、スリーブ３の全長は、大径部３Ａの先端面が本体２の雌ネジ部２Ｂと空 洞部２Ａとの段部２Ｃに当接するまでねじ込まれたとき、小径部３Ｃの先端３Ｊ と本体空洞部底面２Ｈとの間にポート１Ｂの油路が確保できるよう十分な隙間が 残る寸法にすると共に、スリーブ３の中径部３Ｂの外周のシールリング溝６に装 着したシール材７が本体２の空洞部内径２Ａに当接して本体内部から油が外部に 漏洩するのを阻止出来るようにする。Further, the total length of the sleeve 3 is such that when the tip surface of the large diameter portion 3A is screwed in until it comes into contact with the stepped portion 2C of the female screw portion 2B and the cavity portion 2A of the main body 2, the tip of the small diameter portion 3C. 3J and the bottom surface 2H of the main body cavity are dimensioned to leave a sufficient gap to secure the oil passage of the port 1B, and the sealing material mounted in the seal ring groove 6 on the outer circumference of the medium diameter portion 3B of the sleeve 3 7 contacts the inner diameter 2A of the cavity of the main body 2 to prevent oil from leaking from the inside of the main body to the outside.
【００１９】 弁体４は、前方は前述のスリーブ３の空洞部内径３Ｄより外径が若干小さい長 寸の大径部４Ａと後方は短寸の小径部４Ｂとを同心に有す段つき円筒形で、大径 部先端と小径部後端には各端部に向けて先細のテーパー面４Ｃと４Ｄを夫々形成 し、テーパー面４Ｃのほぼ中間部が前述の本体２の弁座２Ｆの内径寸法にまたテ ーパー面４Ｄのほぼ中間部が前述のスリーブ３の弁座３Ｉの内径寸法に夫々等し くなるように形成されている。The valve body 4 is a stepped cylinder concentrically having a long large-diameter portion 4A having a slightly smaller outer diameter than the hollow portion inner diameter 3D of the sleeve 3 at the front and a short small-diameter portion 4B at the rear. In the shape, the front end of the large diameter portion and the rear end of the small diameter portion are respectively formed with tapered taper surfaces 4C and 4D toward the respective ends, and substantially the middle portion of the taper surface 4C is the inner diameter of the valve seat 2F of the main body 2 described above. The taper surface 4D is formed to have a size approximately equal to the inner diameter of the valve seat 3I of the sleeve 3 described above.
【００２０】 そして、上記弁体４が大径部を左側に向けて前述のスリーブ３の空洞部Ｇの内 径３Ｄに収納され、Ｇ内で前後（図１の左右）方向に摺動可能に保持される。The valve body 4 is housed in the inner diameter 3D of the hollow portion G of the sleeve 3 with the large diameter portion facing leftward, and is slidable in the front and rear direction (left and right in FIG. 1) in the G. Retained.
【００２１】 一方、弁体４の小径部後端面４Ｅとスリーブ３の穴３Ｅの底部３Ｆとの間に圧 縮スプリング５を配置し、このスプリング５の復元力で弁体４を前方（左方向） に押し出して大径部テーパー面４Ｃを弁座２Ｆに当接させ、ポート１Ａを閉塞す るように構成する。On the other hand, a compression spring 5 is arranged between the rear end surface 4E of the small diameter portion of the valve body 4 and the bottom portion 3F of the hole 3E of the sleeve 3, and the restoring force of this spring 5 causes the valve body 4 to move forward (to the left). ), The large diameter tapered surface 4C is brought into contact with the valve seat 2F, and the port 1A is closed.
【００２２】 以上述べた構成により、通常は、弁体４がスプリング５の復元力により左側に 押されてポート１Ａを閉塞すると共にポート１Ｂと１Ｃとを内部で連通し、ポー ト１Ｂからの油は２Ｈと３Ｊの間の隙間に入り、２Ａと３Ｃとの隙間Ｓを通り貫 通孔３Ｈから空洞部Ｇへ入り貫通孔３Ｇからポート１Ｃへ流れる。With the configuration described above, normally, the valve body 4 is pushed to the left by the restoring force of the spring 5 to close the port 1A and communicate the ports 1B and 1C internally, and the oil from the port 1B is connected. Enters the gap between 2H and 3J and passes through the gap S between 2A and 3C into the cavity G from the through hole 3H and flows from the through hole 3G to the port 1C.
【００２３】 この状態から、ポート１Ａに高圧が作用したときは、弁体４の左端面に作用す る高圧油圧の推力がスプリング５の押力に打ち勝って弁体４を右方向に押し込み 弁座２Ｆと弁体大径部テーパー面４Ｃとを離して、ポート１Ａと１Ｂを連通させ ると共に、弁体４の右移動により弁体大径部４Ａがスリーブの貫通孔３Ｈを塞ぎ 且つ弁体小径部テーパー面４Ｄがスリーブ３の弁座３Ｉに当接してポート１Ｃへ の通路を閉塞するため、ポート１Ａから流入する高圧油は全てポート１Ｂ側へ流 れる。From this state, when a high pressure acts on the port 1A, the thrust of the high-pressure hydraulic pressure acting on the left end surface of the valve body 4 overcomes the pushing force of the spring 5 and pushes the valve body 4 to the right, and the valve seat 2F and the valve body large diameter portion tapered surface 4C are separated from each other so that the ports 1A and 1B are communicated with each other, and the valve body large diameter portion 4A closes the through hole 3H of the sleeve by moving the valve body 4 to the right and the valve body small diameter portion. Since the tapered surface 4D contacts the valve seat 3I of the sleeve 3 and closes the passage to the port 1C, all the high pressure oil flowing from the port 1A flows to the port 1B side.
【００２４】 以上の如く、この自動三方切換弁は、ポート１Ａの油圧が高圧の時は１Ａから １Ｂへ、或いはポート１Ａの油圧が低圧の時は１Ｂから１Ｃへと自動的に通路が 切り換わり、人手による切換操作は全く不要である。As described above, this automatic three-way switching valve automatically switches the passage from 1A to 1B when the hydraulic pressure at port 1A is high, or from 1B to 1C when the hydraulic pressure at port 1A is low. No manual switching operation is required.
【００２５】 以上の構成の自動三方切換弁を油圧回路記号で示した場合、例えば図２の符号 １で示す様に表示し、上述の油圧ポート１Ａ、１Ｂ、１Ｃは図２の符号１Ａ、１ Ｂ、１Ｃに夫々対応している。When the automatic three-way switching valve having the above configuration is shown by a hydraulic circuit symbol, it is displayed as shown by reference numeral 1 in FIG. 2, for example, and the above-mentioned hydraulic ports 1A, 1B, 1C are shown by reference numerals 1A, 1 in FIG. It corresponds to B and 1C, respectively.
【００２６】 図２は、油圧ブレーカーを油圧バックホーのアーム先端に取付けて油圧バック ホーから油圧の供給を受けて使用する場合の回路例を示すもので、符号１は本考 案の自動三方切換弁を示し、符号１５は油圧ブレーカー、符号１１は油圧バック ホー側油圧源からのブレーカーなどの作業機具用油圧取り出し口、符号１３はリ リーフ弁、符号１４はバックホー側の共用フィルター、符号１７はタンク、符号 １２はブレーカーなどの作業機具を制御するための３ポジション６方口の流量方 向制御弁、符号１６は自動三方切換弁１のポート１Ｃからタンク１７へ直接戻す バイパス分岐路に設けた専用フィルターをそれぞれ示し、これらの符号は全て図 ３、図４においても共通であるが、図３、図４の符号３１はブレーカー以外の作 業機具として往復動油圧シリンダー３２を備えた掴み機を例示している。FIG. 2 shows an example of a circuit in which a hydraulic breaker is attached to the arm tip of a hydraulic backhoe and used by receiving hydraulic pressure from the hydraulic backhoe. Reference numeral 1 is an automatic three-way switching valve of the present invention. Reference numeral 15 is a hydraulic breaker, reference numeral 11 is a hydraulic outlet for working equipment such as a breaker from a hydraulic backhoe hydraulic source, reference numeral 13 is a relief valve, reference numeral 14 is a common filter on the backhoe side, and reference numeral 17 is a tank. Reference numeral 12 is a 3-position 6-way flow direction control valve for controlling working equipment such as a breaker, and reference numeral 16 is a dedicated one provided on a bypass branch path for directly returning from the port 1C of the automatic three-way switching valve 1 to the tank 17. Filters are shown respectively, and these reference numerals are common in FIGS. 3 and 4, but the reference numeral 31 in FIGS. 3 and 4 indicates operations other than the breaker. A gripping machine provided with a reciprocating hydraulic cylinder 32 is illustrated as a device.
【００２７】 なお、図２においてはブレーカーからの戻り管路にのみ本考案の自動三方切換 弁１を設けた例を示しているが、図３および図４では流量方向制御弁１２と掴み 機３１を結ぶ往復の管路夫々に本考案の自動三方切換弁１、１’を設けた場合の 回路例を示し、図中の符号１Ａ’、１Ｂ’、１Ｃ’は１Ａ、１Ｂ、１Ｃに夫々対 応し、各管路の自動三方切換弁１、１’からタンク１７へ至るバイパス分岐路は 専用フィルター１６の手前で合流させている。Although FIG. 2 shows an example in which the automatic three-way switching valve 1 of the present invention is provided only in the return line from the breaker, in FIGS. 3 and 4, the flow direction control valve 12 and the gripper 31 are shown. An example of a circuit in the case where the automatic three-way switching valve 1, 1'of the present invention is provided in each of the reciprocating pipes connecting the two is shown. Reference numerals 1A ', 1B', 1C 'in the drawing correspond to 1A, 1B, 1C, respectively. Therefore, the bypass branch passages from the automatic three-way switching valves 1, 1 ′ of the respective pipelines to the tank 17 are joined before the special filter 16.
【００２８】 図２において、流量方向切換弁１２を図示の位置に切り換えると、ポートＰと Ａ、ポートＴとＢが夫々連通し、油圧源１１の油はポートＰとＡとを通って図示 の矢印の方向に沿って流れ、管路Ａからブレーカー１１に供給され、ブレーカー １５からの戻り油は管路Ｂを通って自動三方切換弁１のポート１Ｂから１Ｃに抜 け、バイパス分岐路Ｄを通って専用フィルター１６で異物が除去され、最終的に タンク１７へ戻る。In FIG. 2, when the flow direction switching valve 12 is switched to the illustrated position, the ports P and A and the ports T and B communicate with each other, and the oil of the hydraulic power source 11 passes through the ports P and A to the illustrated position. It flows in the direction of the arrow, is supplied from the line A to the breaker 11, and the return oil from the breaker 15 passes through the line B and drains from the ports 1B to 1C of the automatic three-way switching valve 1 to the bypass branch D. The foreign matter is removed through the special filter 16 and finally returned to the tank 17.
【００２９】 図３においては、流量方向切換弁１２は図２と同じ状態のため、油圧源１１の 油はポートＰとＡとを通って図示の矢印の方向に沿って流れ、上の管路Ａから自 動三方切換弁１’のポート１Ａ’に供給され、弁体４’を押してポート１Ｂ’へ 抜け、管路Ｂ’を経て掴み機３１のシリンダー３２のシリンダーヘッド側に供給 され、ピストンロッドを押し出し、ピストンロッド側からの戻り油は管路Ｂを通 って自動三方切換弁１のポート１Ｂから１Ｃに抜け、バイパス分岐路Ｄを通って 専用フィルター１６で異物が除去され、最終的にタンク１７へ戻る。In FIG. 3, since the flow direction switching valve 12 is in the same state as in FIG. 2, the oil of the hydraulic power source 11 flows through the ports P and A in the direction of the arrow shown in the drawing, and the upper pipe line It is supplied to the port 1A 'of the automatic three-way switching valve 1'from A, pushes the valve body 4'to escape to the port 1B', and is supplied to the cylinder head side of the cylinder 32 of the gripper 31 via the pipe line B '. The rod is pushed out, and the return oil from the piston rod side passes through the line B and passes from the port 1B of the automatic three-way switching valve 1 to 1C. Return to tank 17.
【００３０】 図４においては、流量方向切換弁１２は図３と反対の位置に切換え、ポートＰ とＢ、ポートＴとＡが夫々連通するため、油圧源１１の油はポートＰとＢとを通 って図示の矢印の方向に沿って流れ、下の管路Ｃから自動三方切換弁１のポート １Ａに供給され、弁体４を押してポート１Ｂへ抜け、管路Ｂを経て掴み機３１の シリンダー３２のピストンロッド側に供給され、ピストンロッドを押し込んでシ リンダーヘッド側からの戻り油は管路Ｂ’を通って自動三方切換弁１’のポート １Ｂ’から１Ｃ’に抜け、バイパス分岐路Ｄ’と合流バイパス分岐路Ｄを通って 専用フィルター１６で異物が除去され、最終的にタンク１７へ戻る。In FIG. 4, the flow direction switching valve 12 is switched to the position opposite to that in FIG. 3, and the ports P and B and the ports T and A communicate with each other, so that the oil of the hydraulic source 11 connects the ports P and B. It flows in the direction of the arrow shown in the drawing, is supplied from the lower pipe C to the port 1A of the automatic three-way switching valve 1, pushes the valve body 4 and exits to the port 1B, and passes through the pipe B to the gripper 31 of the gripper 31. The oil supplied to the piston rod side of the cylinder 32, pushing the piston rod and returning oil from the cylinder head side passes through the pipe line B ′ and escapes from the port 1B ′ of the automatic three-way switching valve 1 ′ to 1C ′, and the bypass branch passage. The special filter 16 removes foreign matter through D'and the merge bypass branch path D, and finally returns to the tank 17.
【００３１】 上記図３と図４の説明において、掴み機３１は、シリンダーとピストンロッド の各エンドは夫々ピン３５、３５により掴み機のアーム３４、３４の後方に回転 自在に連結され、且つアーム３４、３４は中間の適当な位置において図示しない フレームに対してピン３３、３３で夫々回転自在に連結されているため、流量方 向制御弁の操作によりシリンダー３２が伸縮するとピン３３、３３を支点として アーム３４、３４が回動し先端が開閉して物を掴むことが出来る。In the above description of FIGS. 3 and 4, the gripper 31 has a cylinder and a piston rod whose ends are rotatably connected to the rear of the gripper's arms 34 and 34 by pins 35 and 35, respectively. Since 34 and 34 are rotatably connected to a frame (not shown) at appropriate intermediate positions by pins 33 and 33, respectively, when the cylinder 32 expands and contracts by operating the flow direction control valve, the pins 33 and 33 serve as fulcrums. As a result, the arms 34, 34 rotate to open and close the tips so that an object can be grasped.
【００３２】 図５は本考案の別の実施例の断面図を示す。FIG. 5 shows a sectional view of another embodiment of the present invention.
【００３３】 この別の実施例の構成は、まず、本体５１は同心の大径部と小径部とから成る 互いに連通した円筒形空洞部を内部に形成すると共に小径部には油圧ポート１Ａ 、１Ｂ、また大径部には油圧ポート１Ｃを夫々概略図示のような位置関係に設け 、一方前記本体空洞部内に左右に摺動可能に装着された弁体５４は、左側には前 記本体空洞部の小径部より若干小径の小径部と右側には前記本体空洞部の大径部 より若干小径の大径部と中間には小径部より小径の中間部とを夫々有し且つ大径 部端面から小径部中間位置まで通した中心孔と小径部の外周から半径方向にこの 中心孔の先端に通じる孔とから成る油の通路５４Ａを有し、前記本体空洞部の左 端の底部と前記弁体小径部先端面との間にはスプリング５５を配し、さらに、先 端部には本体空洞部大径部より若干小径の小径部をまた基部にはこれより大径で 且つ外周に雄ネジを形成した大径部を夫々有すると共に小径部基部にシールリン グ溝を形成したプラグ５２を前記本体５１の空洞部右端からねじ込み、前記シー ルリング溝に装着したシール材５３が本体空洞部の大径部内面に当接して内部の 油が漏洩しないように構成し、さらに、本体５１には、空洞部の先端部から油圧 ポート１Ｃに通じる油の通路５１Ａが設けてある。In the structure of this another embodiment, first, the main body 51 has a cylindrical hollow portion formed of a concentric large-diameter portion and a small-diameter portion that communicate with each other, and the hydraulic ports 1A, 1B are provided in the small-diameter portion. Further, the hydraulic ports 1C are provided in the large-diameter portions in the positional relations as schematically illustrated, respectively, while the valve body 54 slidably mounted in the main body cavity portion on the left and right sides has the main body cavity portion on the left side. Has a small diameter part slightly smaller than the small diameter part and a large diameter part slightly smaller than the large diameter part of the main body cavity on the right side, and an intermediate part having a smaller diameter than the small diameter part in the middle, and from the end part of the large diameter part. It has an oil passage 54A consisting of a central hole passing to the middle position of the small diameter part and a hole leading from the outer circumference of the small diameter part to the tip of this central hole, and the bottom part at the left end of the main body cavity and the valve body. A spring 55 is placed between the tip of the small diameter part and the tip end. Each part has a small diameter part that is slightly smaller than the large diameter part of the main body cavity, and the base part has a large diameter part that is larger than this and has a male thread on the outer periphery, and a sealing ring groove is formed in the base part of the small diameter part. The plug 52 is screwed in from the right end of the hollow portion of the main body 51, and the sealing material 53 mounted in the seal ring groove abuts against the inner surface of the large diameter portion of the main body hollow portion so that oil inside does not leak. 51 is provided with an oil passage 51A that communicates with the hydraulic port 1C from the tip of the hollow portion.
【００３４】 弁体５４の通路５４Ａの開口部は、小径部外周を図示の用に外周に沿って円周 切り欠き部を形成し且つポート１Ａ側にも本体空洞部内面に沿って円周切り欠き を形成し、これらの切り欠きによって、弁体がポート１Ａに作用する高圧によっ て左に移動してもポート１Ａと弁体内部の通路５４Ａとは常に連通するようにす ると共に、一方、プラグ５２の先端面は、図示のように外縁部を僅かに残して中 央部を削って凹所を形成し、弁体５４がスプリング５５によって左に押されプラ グ５２の先端に当接しても弁体内部の通路５４Ａから導かれた油圧がこの凹所に 入り、弁体５４の大径部右端を押すことが出来るように構成する。The opening portion of the passage 54A of the valve body 54 has a circumferential notch formed along the outer circumference of the small diameter portion along the outer circumference as shown in the drawing, and a circular cut along the inner surface of the main body cavity portion on the port 1A side. Notches are formed so that even if the valve body moves to the left due to the high pressure acting on the port 1A, these notches ensure that the port 1A and the passage 54A inside the valve body always communicate with each other. As shown in the drawing, the tip surface of the plug 52 leaves the outer edge slightly and forms a recess by cutting the center part, and the valve body 54 is pushed to the left by the spring 55 and abuts on the tip of the plug 52. Even so, the hydraulic pressure introduced from the passage 54A inside the valve body enters into this recess, and the right end of the large diameter portion of the valve body 54 can be pushed.
【００３５】 つぎにこの自動三方切換弁の作用について説明する。 通常ポート１Ａが低圧のときは、弁体５４がスプリング５５によって本体５１ の空洞部内の図面の右方向に押され弁体右端がプラグ５２の先端に当接し、この 状態では図示のようにポート１Ａは１Ｂと遮断されると共に通路５４Ａと連通し 且つポート１Ｂと１Ｃとが弁体中間部と本体空洞部との隙間を介して連通し、作 業機側からの戻り油はポート１Ｂから１Ｃへ導かれタンクへのバイパス分岐路へ 排出されるが、一方、流量方向制御弁を操作してポート１Ａ側に油圧源からの高 圧油が作用すると、１Ａの高圧油が通路５４Ａを通って弁体５４右端に導かれ、 弁体５４右端に作用する油圧推力がスプリング５５の力に打ち勝って弁体５４の 大径部左端が本体５１の空洞部の大径左端面に当接するまで弁体５４を左方向に 押し、この移動により、弁体５４左端の本体空洞小径部内の油は通路５１Ａを通 ってポート１Ａに排出され、弁体大径部がポート１Ｃを閉塞すると共にポート１ Ａと１Ｂとが弁体中間部と本体空洞部との隙間を介して連通し、油圧源からの油 はポート１Ａから１Ｂへ導かれ、作業機具側へ供給される。Next, the operation of this automatic three-way switching valve will be described. Normally, when the port 1A has a low pressure, the valve body 54 is pushed rightward in the drawing in the cavity of the main body 51 by the spring 55 so that the right end of the valve body abuts on the tip of the plug 52. Is blocked from 1B and communicates with the passage 54A, and ports 1B and 1C communicate with each other through the gap between the valve body intermediate part and the main body cavity, and the return oil from the working machine side goes from port 1B to 1C. The high pressure oil from the hydraulic pressure source acts on the port 1A side by operating the flow direction control valve, and the high pressure oil of 1A passes through the passage 54A to the valve. The valve body 54 is guided to the right end of the body 54, and the hydraulic thrust acting on the right end of the valve body 54 overcomes the force of the spring 55 so that the left end of the large diameter portion of the valve body 54 contacts the large diameter left end surface of the cavity of the main body 51. Press to the left to move Therefore, the oil in the small diameter portion of the main body cavity at the left end of the valve body 54 is discharged to the port 1A through the passage 51A, the large diameter portion of the valve body closes the port 1C, and the ports 1A and 1B form the intermediate portion of the valve body. The oil from the hydraulic pressure source is communicated through the gap with the main body cavity, is guided from the ports 1A to 1B, and is supplied to the working tool side.
【００３６】 流量方向制御弁の操作でポート１Ａ側に接続された配管が流量方向制御弁内で タンクポートと連通されると、ポート１Ａは低圧となり、スプリング５５の力に よって弁体５４が右に押され、弁体５４の大径部右端面とプラグ５２の間の油は 通路５４Ａを経てポート１Ａから流量方向制御弁を中継してタンクへ排出され、 弁体小径部がポート１Ａを閉塞すると共にポート１Ｂと１Ｃとが弁体中間部と本 体５１の空洞部との隙間を介して連通する。When the pipe connected to the port 1A side by the operation of the flow direction control valve communicates with the tank port in the flow direction control valve, the port 1A becomes low pressure and the force of the spring 55 causes the valve body 54 to move to the right. The oil between the right end surface of the large-diameter portion of the valve element 54 and the plug 52 is discharged to the tank through the passage 54A from the port 1A through the flow direction control valve, and the small-diameter portion of the valve element closes the port 1A. At the same time, the ports 1B and 1C communicate with each other through the gap between the valve body intermediate portion and the cavity of the main body 51.
【００３７】 なお、本考案の自動三方切換弁は、上記２つの実施例のような直動式でなく、 別の方法として、詳細構造は図示しないが、ポート１Ａから分岐させたパイロッ ト油圧によってパイロットピストンを動かし、このパイロットピストンで弁体を 移動して通路を切換える間接作動方式としてもよい。The automatic three-way switching valve of the present invention is not a direct-acting type valve as in the above two embodiments. As another method, a detailed structure is not shown, but a pilot hydraulic pressure branched from the port 1A is used. An indirect operation method may be used in which the pilot piston is moved and the valve element is moved by this pilot piston to switch the passage.
【００３８】 また、図１において、弁体４は、図示のような形状とはせず、球形または両端 が部分球面の円筒形とし、この弁体をスリーブ３先端の小径空洞部で前後に摺動 可能に案内支持し、この弁体が後方へ移動してシート面３Ｉに弁体球面部が当接 した位置でこの弁体が貫通孔３Ｈを閉塞するかまたは貫通孔３Ｈが球形弁体の中 心より左側に位置しポート１Ｃへ通じないようにしてもよい。Further, in FIG. 1, the valve body 4 is not shaped as shown, but is spherical or cylindrical with both ends partially spherical, and this valve body is slid back and forth in a small-diameter cavity at the tip of the sleeve 3. The valve body movably guides and supports the valve body, and the valve body closes the through hole 3H at a position where the valve body spherical portion comes into contact with the seat surface 3I. It may be located on the left side of the center and not connected to the port 1C.
【００３９】[0039]
本考案の自動三方切換弁は、上記実施例に示すように配管して用いた場合、自 動的に回路が切り換わり、従来の手動操作式三方切換弁を使用した場合とは異な り、オペレーターに面倒な回路切換操作を要求する必要がなくなる。 The automatic three-way switching valve of the present invention, when used as a pipe as shown in the above embodiment, automatically switches the circuit, which is different from the conventional manual operation type three-way switching valve. There is no need to require a troublesome circuit switching operation.
【００４０】 また、この自動三方切換弁を使用すると、ブレーカーからの戻り油を流量方向 制御弁を経由せず自動的にバイパス管路を経由して直接タンクへバイパス出来る ので、戻りの管路抵抗を少なくすることが出来、ブレーカーの打撃力と打数を上 げ、エネルギーの有効利用と作業の効率化がはかれる。Further, when this automatic three-way switching valve is used, the return oil from the breaker can be automatically bypassed directly to the tank via the bypass pipe line without passing through the flow direction control valve, so the return line resistance Can be reduced, the hitting force and the number of hits of the breaker can be increased, the effective use of energy and the efficiency of work can be achieved.
【００４１】 ブレーカーからの戻り油は専用のバイパス管路を通ってこの管路に設けられた 専用のフィルターを経由してタンクに戻るため、あるいはさらに本考案の自動三 方切換弁を図３、図４に示すように往復の配管夫々に設け夫々のタンクへのバイ パス分岐路を合流し、この合流管路にフィルターを設けた場合は、ブレーカー以 外の作業機具からの戻り油はすべてバイパス管路の専用フィルターを経由してタ ンクに戻るため、作業機具の戻り油に混在する異物をこのフィルターで除去し、 台車側の油圧システムに異物が侵入するのを防止できる。Return oil from the breaker is returned to the tank through a dedicated bypass line through a dedicated filter provided in this line, or further, the automatic three-way switching valve of the present invention is used in FIG. As shown in Fig. 4, when the bypass passages to the tanks are connected to each of the reciprocating pipes and a filter is provided to this junction pipe, all the return oil from the working equipment other than the breaker is bypassed. Since it returns to the tank via the dedicated filter in the pipeline, foreign matter mixed in the return oil of the working equipment can be removed by this filter, and foreign matter can be prevented from entering the hydraulic system on the truck side.
【図１】本考案の自動三方切換弁の実施例の断面図。FIG. 1 is a sectional view of an embodiment of an automatic three-way switching valve of the present invention.
【図２】本考案の自動三方切換弁をブレーカーの油圧回
路に使用した場合の回路例。FIG. 2 is a circuit example when the automatic three-way switching valve of the present invention is used in a hydraulic circuit of a breaker.
【図３】およびFIG. 3 and
【図４】本考案の自動三方切換弁をブレーカー以外の作
業機具に使用した場合の回路例。FIG. 4 is an example of a circuit when the automatic three-way switching valve of the present invention is used in a working tool other than a breaker.
【図５】本考案の別の実施例。FIG. 5 is another embodiment of the present invention.
【図６】従来の三方切換弁の断面図。FIG. 6 is a sectional view of a conventional three-way switching valve.
【図７】従来の三方切換弁をブレーカーの油圧回路に使
用した回路図。FIG. 7 is a circuit diagram in which a conventional three-way switching valve is used in a hydraulic circuit of a breaker.
１ 自動三方切換弁 １Ａ、１Ｂ、１Ｃ 油圧ポート ２ 本体 ３ スリーブ ４ 弁体 ５ スプリング 1 Automatic three-way switching valve 1A, 1B, 1C Hydraulic port 2 Body 3 Sleeve 4 Valve body 5 Spring
Claims (1)
端に取付けた作業機具と該作業機具制御用の流量方向制
御弁との間を接続する往復の油圧配管のうち少なくとも
一方の中間に三方切換弁を設け、前記作業機具からの戻
り油を直接タンクへバイパスが出来るように前記三方切
換弁からタンクバイパス用分岐路を設けた構成の油圧回
路において、前記三方切換弁は、該三方切換弁の本体内
部で前後に摺動可能に案内支持された回路切換用弁体と
該弁体の一端に配設したスプリングとを有し、該スプリ
ングの復元力によって前記弁体を片側に付勢し、通常は
該弁体がこの位置で前記流量方向制御弁側のポートを閉
塞すると共に、作業機具側のポートを前記タンクバイパ
ス用分岐路のポートと連通せしめ、また、前記流量方向
制御換弁側ポートに高圧が作用したときはこの高圧の油
圧による推力が前記スプリングの力に打ち勝って前記弁
体を押し、該弁体が前記タンクバイパス用分岐路のポー
トを閉塞すると共に、流量方向制御弁側のポートと作業
機具側のポートとを連通せしめる位置に自動的に変位す
るように構成したことを特徴とするバックホー取付作業
機具用自動三方切換弁。1. A three-way switching valve in the middle of at least one of reciprocating hydraulic pipes connecting a work implement attached to the tip of an arm of a work carriage such as a backhoe and a flow direction control valve for controlling the work implement. And a tank bypass branch passage is provided from the three-way switching valve so that the return oil from the working tool can be directly bypassed to the tank.The three-way switching valve is a main body of the three-way switching valve. It has a circuit-switching valve body that is slidably guided back and forth inside and a spring arranged at one end of the valve body, and the restoring force of the spring urges the valve body to one side. The valve body closes the port on the flow direction control valve side at this position, communicates the port on the working implement side with the port on the branch passage for the tank bypass, and connects the port on the flow direction control valve side to the port. When a high pressure is applied, the thrust due to this high hydraulic pressure overcomes the force of the spring and pushes the valve element, and the valve element closes the port of the tank bypass branch passage and the port on the flow direction control valve side. An automatic three-way switching valve for backhoe-mounted work equipment, characterized in that it is automatically displaced to a position where it can communicate with a port on the work equipment side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11101491U JPH0545350U (en) | 1991-11-19 | 1991-11-19 | Automatic three-way switching valve for backhoe mounting work equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11101491U JPH0545350U (en) | 1991-11-19 | 1991-11-19 | Automatic three-way switching valve for backhoe mounting work equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0545350U true JPH0545350U (en) | 1993-06-18 |
Family
ID=14550214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11101491U Pending JPH0545350U (en) | 1991-11-19 | 1991-11-19 | Automatic three-way switching valve for backhoe mounting work equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0545350U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5382967B1 (en) * | 2013-04-22 | 2014-01-08 | 木部建設株式会社 | Environmentally friendly system for work machines |
| EP3018365A1 (en) * | 2014-11-03 | 2016-05-11 | Elleprogetti di Enzo Landi | Pneumatic apparatus |
| JP2020002647A (en) * | 2018-06-28 | 2020-01-09 | オカダアイヨン株式会社 | Attachment of work machine, and hydraulic operation valve for attachment of work machine |
-
1991
- 1991-11-19 JP JP11101491U patent/JPH0545350U/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5382967B1 (en) * | 2013-04-22 | 2014-01-08 | 木部建設株式会社 | Environmentally friendly system for work machines |
| EP3018365A1 (en) * | 2014-11-03 | 2016-05-11 | Elleprogetti di Enzo Landi | Pneumatic apparatus |
| JP2020002647A (en) * | 2018-06-28 | 2020-01-09 | オカダアイヨン株式会社 | Attachment of work machine, and hydraulic operation valve for attachment of work machine |
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