【考案の詳細な説明】 （産業上の利用分野） 本考案は、圧力流体流入路からの圧油によってスプール
を切換制御させるようにした流量制御機構に関し、当該
スプールが切換わり、通常位置へと復帰する際、温度変
化に影響を受けることなくスムーズに復帰動作できるこ
とを可能にしたものに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flow rate control mechanism in which pressure oil from a pressure fluid inflow path controls switching of a spool, and the spool is switched to a normal position. The present invention relates to a device that enables a smooth return operation without being affected by temperature changes when returning.
（従来の技術と考案が解決しようとする問題点） 従来、例えば、農業用トラクタのように１台のポンプで
パワーステアリング装置のパワーシリンダと他の作業機
とを作動させるような場合には、流量制御機構が使用さ
れる。この流量制御機構は、所定のポートを備えたハウ
ジング内に、スプールを移動自在に収容し、上記スプー
ルを流体圧により適宜移動させ、圧力流体を所定のポー
トを介して供給するものである。(Problems to be Solved by Conventional Techniques and Inventions) Conventionally, for example, in the case of operating a power cylinder of a power steering device and another working machine by one pump like an agricultural tractor, A flow control mechanism is used. This flow rate control mechanism accommodates a spool movably in a housing having a predetermined port, appropriately moves the spool by fluid pressure, and supplies a pressure fluid through the predetermined port.
そして、上記従来の流量制御機構にあっては、スプール
が切換り、もとの状態に復帰する際、ハンチング等を起
こさないよう、当該スプールにオリフィスからなるダン
パ装置を設けているのが通常であるが、しかしこのよう
なオリフィスを利用するものでは、圧力流体の温度が低
い場合、流体の粘性が大きくなり、スプールの戻り特性
が悪くなるばかりか、逆に高温時には、粘性が低下する
ためスプールが振動してしまうといった問題があった。In the above conventional flow rate control mechanism, it is usual to provide a damper device including an orifice on the spool so that hunting does not occur when the spool switches and returns to its original state. However, in the case of using such an orifice, when the temperature of the pressure fluid is low, the viscosity of the fluid becomes large, and the return characteristic of the spool deteriorates. There was a problem that would vibrate.
本考案はこのような問題点を解決するためになされたも
ので、その目的とするところは、圧力流体の温度変化に
拘らず、上記スプールの戻り特性を良好に保てるような
流量制御機構におけるダンパ装置を提供することにあ
る。The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a damper in a flow rate control mechanism capable of maintaining a good return characteristic of the spool regardless of the temperature change of the pressure fluid. To provide a device.
（問題を解決するための手段） 上記目的を達成するため、本願考案によるダンパ装置
は、圧力流体が流入する圧力流体流入路からの圧油によ
って切換制御されるスプールの端部にダンパ室を形成
し、当該ダンパ室をスプールに穿ったオリフィスを介し
て互いに連通させるようにしてなる流量制御機構を前提
としつつ、 上記ダンパ室内に弁体を介装し、当該弁体に上記スプー
ルに穿ったオリフィスよりも小径なオリフィスを穿設す
るとともに、当該弁体を、形状記憶合金で構成したスプ
リングを介してオリフィス側へと押圧することを特徴と
するものである。(Means for Solving the Problem) In order to achieve the above object, the damper device according to the present invention has a damper chamber formed at an end of a spool which is switch-controlled by pressure oil from a pressure fluid inflow passage into which a pressure fluid flows. However, on the premise of a flow rate control mechanism in which the damper chamber is communicated with each other through the orifice bored in the spool, the valve body is provided in the damper chamber, and the orifice bored in the spool is bored in the valve body. It is characterized in that an orifice having a smaller diameter than that of the above-mentioned valve is bored and the valve body is pressed toward the orifice side via a spring made of a shape memory alloy.
（作用） スプールの復帰作動時、圧力流体の温度が予め設定され
た温度以下になった場合、弁体を押圧する形状記憶合金
からなるスプリングが収縮し、スプールに穿ったオリフ
ィスによるダンパ機能を発揮させ、応答性の向上を図る
ことができ、又、温度が設定以上に上昇した場合には、
上記弁体がスプリングによりスプールに穿ったオリフィ
スへと押圧されるために、今度は弁体に穿ったオリフィ
スが作用して、スプールに生じる振動を防止する。(Operation) When the temperature of the pressure fluid becomes lower than the preset temperature at the time of spool return operation, the spring made of shape memory alloy that presses the valve element contracts, and the damper function by the orifice bored in the spool is exerted. The response can be improved, and if the temperature rises above the set level,
Since the valve body is pressed against the orifice bored in the spool by the spring, the orifice bored in the valve body acts this time to prevent the vibration generated in the spool.
（実施例） 以下第１図を参照して、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 FIG.
図は、本実施例のダンパ装置を適用した流量制御機構の
構成を示す断面図であり、図中符号１はハウジングであ
る。上記ハウジング１には、圧力流体流入ポート（図中
INで示す）３、図示しないパワーシリンダに圧力流体を
供給する制御流ポート（図中PFで示す）５、余剰の圧力
流体を排出する余剰流ポート（図中EFで示す）７、及び
圧力流体を図示しないタンクに戻す戻りポート（図中Ｔ
で示す）９がそれぞれ形成されている。FIG. 1 is a cross-sectional view showing the structure of a flow rate control mechanism to which the damper device of this embodiment is applied, in which reference numeral 1 is a housing. The housing 1 has a pressure fluid inflow port (in the figure,
IN) 3, a control flow port (indicated by PF in the figure) 5 for supplying pressure fluid to a power cylinder (not shown), an excess flow port (indicated by EF in the figure) 7 for discharging excess pressure fluid, and pressure fluid Return port to the tank (not shown) (T in the figure
9) are formed respectively.
上記ハウジング１内にはスプール摺動室11が形成されて
いて、このスプール摺動室11内にはスプール13が図中左
右方向に摺動可能に収容されている。上記スプール13の
図中左側には中空部14が形成されており、この中空部14
は段付き構造となっている。そして中空部14にスプリン
グ15が収容され、このスプリング15の図中左端はハウジ
ング１に当接しており、一方右端は上記段付き部に当接
している。スプール13はこのスプリング15により常時図
中右方向に付勢されている。又、上記中空部14の図中右
側端面には制御オリフィス17が形成されている。A spool sliding chamber 11 is formed in the housing 1, and a spool 13 is accommodated in the spool sliding chamber 11 so as to be slidable in the left-right direction in the drawing. A hollow portion 14 is formed on the left side of the spool 13 in the figure.
Has a stepped structure. A spring 15 is housed in the hollow portion 14, and the left end of the spring 15 in the figure is in contact with the housing 1, while the right end is in contact with the stepped portion. The spool 13 is constantly urged by the spring 15 in the right direction in the figure. A control orifice 17 is formed on the right end surface of the hollow portion 14 in the drawing.
上記スプール13には前記圧力流体流入ポート３に連通す
る流路25が形成されており、圧力流体流入ポート３を介
してハウジング１内に流入した圧力流体はこの流路25を
介して上記制御オリフィス17に流入していく。A flow path 25 communicating with the pressure fluid inflow port 3 is formed in the spool 13, and the pressure fluid flowing into the housing 1 via the pressure fluid inflow port 3 passes through the flow path 25 to the control orifice. It flows into 17.
又、スプール13の図中右側端部には流路27がスプール13
の軸方向に形成されており、この流路27を介して圧力流
体流入ポート３とスプール13及びハウジング１間のダン
パ室29とが連通している。A flow path 27 is provided at the right end of the spool 13 in the drawing.
The pressure fluid inflow port 3 and the damper chamber 29 between the spool 13 and the housing 1 communicate with each other through the flow path 27.
又、前記弁体61が配置されている位置及びその近傍位置
のスプール13は縮径されていて環状溝31が形成されてい
る。この環状溝31が前記余剰流ポート７への流路にな
る。The spool 13 at the position where the valve body 61 is arranged and in the vicinity thereof is reduced in diameter to form an annular groove 31. The annular groove 31 serves as a flow path to the surplus flow port 7.
尚、上記スプール13の図中上方位置のハウジング１内に
は弁機構33が設けられており、この弁機構33は弁体35と
スプリング37とから構成されている。この弁機構33が開
弁することにより前記戻りポート９を介して圧力流体が
タンクに戻る。A valve mechanism 33 is provided inside the housing 1 at a position above the spool 13 in the figure, and the valve mechanism 33 is composed of a valve element 35 and a spring 37. By opening the valve mechanism 33, the pressure fluid returns to the tank via the return port 9.
上記構成によると、図示しないポンプから吐出された圧
力流体は圧力流体流入ポート３を介してハウジング１内
に流入し、流路25、制御オリフィス17、流路27及び制御
流ポート５を介してパワーシリンダに供給される。その
際、圧力流体の一部は流路27を介してダンパ室29内にも
流入し、その結果スプール13に背圧が作用する。この背
圧とスプリング15のスプリング力とによりスプール13の
位置は決定される。そしてスプール13は例えば図示する
ような状態に保持され、余分な圧力流体は環状溝31及び
余剰流ポート７を介して排出される。かかる作用により
上記パワーシリンダに所定量の圧力流体が供給される。According to the above configuration, the pressure fluid discharged from the pump (not shown) flows into the housing 1 through the pressure fluid inflow port 3, and the power is supplied through the flow passage 25, the control orifice 17, the flow passage 27 and the control flow port 5. Supplied to the cylinder. At that time, a part of the pressure fluid also flows into the damper chamber 29 through the flow path 27, and as a result, the back pressure acts on the spool 13. The position of the spool 13 is determined by this back pressure and the spring force of the spring 15. Then, the spool 13 is held, for example, in the state shown in the drawing, and the excess pressure fluid is discharged through the annular groove 31 and the excess flow port 7. Due to this action, a predetermined amount of pressure fluid is supplied to the power cylinder.
一方、スプール13の図中右端のダンパ室29内には弁体61
がスプリング63に付勢された状態で設置されている。
又、流路25の図中右側に位置する壁面にはオリフィス65
が形成されており、一方上記弁体61にはオリフィス65よ
りも小径のオリフィス67が上記オリフィス65と同心に形
成されている。上記スプリング63は形状記憶合金から形
成されており、予め設定された温度以下になると軸方向
に収縮するものである。On the other hand, in the damper chamber 29 at the right end of the spool 13 in the figure, the valve body 61
Is installed while being biased by the spring 63.
Further, an orifice 65 is provided on the wall surface located on the right side of the flow path 25 in the drawing.
On the other hand, an orifice 67 having a diameter smaller than that of the orifice 65 is formed in the valve body 61 concentrically with the orifice 65. The spring 63 is made of a shape memory alloy and contracts in the axial direction when the temperature becomes lower than a preset temperature.
上記構成によると、高温時にはオリフィス65部分におけ
る流路面積が弁体61のオリフィス67によって決まるた
め、スプール13の図中右方向への復帰動作に対する緩衝
機能が効果的に発揮される。一方、低温時にはスプリン
グ63が収縮して弁体61に対する付勢力が低下するので弁
体61が図中右方向に移動し、それによってオリフィス65
部分における流路面積が拡大される。これによって応答
性の低下が防止される。According to the above configuration, since the flow passage area in the orifice 65 portion is determined by the orifice 67 of the valve body 61 when the temperature is high, the buffering function against the return operation of the spool 13 in the right direction in the drawing is effectively exerted. On the other hand, when the temperature is low, the spring 63 contracts and the urging force on the valve body 61 decreases, so that the valve body 61 moves to the right in the figure, which causes the orifice 65 to move.
The flow path area in the portion is enlarged. This prevents a decrease in responsiveness.
（考案の効果） 以上詳述したように本考案によるダンパ装置によると、
流体の温度の変化に拘らず、所望の動作を提供すること
ができるので、適用対象の機器の信頼性を向上させるこ
とができる。(Effect of the Invention) As described in detail above, according to the damper device of the present invention,
Since the desired operation can be provided regardless of the change in the temperature of the fluid, the reliability of the device to which the application is applied can be improved.
【図面の簡単な説明】 第１図は本考案の第１実施例による流量制御機構の断面
図である。 13……スプリング、29……ダンパ室、61……弁体、63…
…スプリング、65……オリフィス、67……オリフィス。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a flow rate control mechanism according to a first embodiment of the present invention. 13 …… Spring, 29 …… Damper chamber, 61 …… Valve body, 63…
… Spring, 65… Orifice, 67… Orifice.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988100509UJPH0638165Y2 (en) | 1988-07-28 | 1988-07-28 | Damper device in flow control mechanism |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988100509UJPH0638165Y2 (en) | 1988-07-28 | 1988-07-28 | Damper device in flow control mechanism |
| Publication Number | Publication Date |
|---|---|
| JPH0222481U JPH0222481U (en) | 1990-02-14 |
| JPH0638165Y2true JPH0638165Y2 (en) | 1994-10-05 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988100509UExpired - LifetimeJPH0638165Y2 (en) | 1988-07-28 | 1988-07-28 | Damper device in flow control mechanism |
| Country | Link |
|---|---|
| JP (1) | JPH0638165Y2 (en) |
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