JP2002004859A - Wax-type thermally-driven control valve for engine refrigerant circulating circuit - Google Patents
Wax-type thermally-driven control valve for engine refrigerant circulating circuitInfo
- Publication number
- JP2002004859A JP2002004859A JP2000193844A JP2000193844A JP2002004859A JP 2002004859 A JP2002004859 A JP 2002004859A JP 2000193844 A JP2000193844 A JP 2000193844A JP 2000193844 A JP2000193844 A JP 2000193844A JP 2002004859 A JP2002004859 A JP 2002004859A
- Authority
- JP
- Japan
- Prior art keywords
- wax
- valve
- refrigerant
- engine
- inner peripheral
- 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.)
- Granted
Links
Landscapes
- Temperature-Responsive Valves (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば、自動車用
エンジンの冷媒（冷却水）をラジエータ回路及びバイパ
ス回路を介して循環させる冷媒循環回路上に設置される
ワックス式熱応動制御弁の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an improvement of a wax-type thermally responsive control valve installed on a refrigerant circulation circuit for circulating a refrigerant (cooling water) of an automobile engine via a radiator circuit and a bypass circuit. .
【０００２】[0002]
【従来の技術】一般に、自動車等には、走行時、エンジ
ンからの高温冷却水をウォータポンプの圧力によりラジ
エータにて冷却し、この低温冷却水をエンジンのウオー
タジャケット内に再供給することにより、エンジンを冷
却するような冷媒循環回路が設けられているとともに、
この冷媒循環回路上には、エンジンへの冷却水の流量及
び温度を調整するワックス式熱応動制御弁が設置されて
いる。2. Description of the Related Art In general, when a vehicle or the like travels, high-temperature cooling water from an engine is cooled by a radiator by the pressure of a water pump, and the low-temperature cooling water is resupplied into a water jacket of the engine. A refrigerant circulation circuit that cools the engine is provided,
A wax-type thermoresponsive control valve for adjusting the flow rate and temperature of the cooling water to the engine is provided on the refrigerant circuit.
【０００３】従来、このようなワックス式熱応動制御弁
としては、例えば、本出願人が先に出願し公開された特
開平１０−１９１６０号公報（先行技術）に開示してな
るような構成を有するものが提案されている。この先行
技術に記載の発明においては、エンジンへの冷却水管路
内に弁本体をシールパッキンを介して設置している。そ
して、弁本体は、冷却水が通水可能な環状弁座と、この
環状弁座の内周部にその外周部が所定の開弁ストローク
範囲で摺接して接離自在に開閉動作する筒状弁体とで構
成され、環状弁座の内周部が摺接する筒状弁体の外周部
側にゴム製環状シールを設けてなるとともに、筒状弁体
を環状弁座に対してスプリングの付勢力にて常に下流側
方向に付勢させて閉弁状態が維持されるように組み付け
られている。Conventionally, such a wax-type thermally responsive control valve has, for example, a configuration as disclosed in Japanese Patent Application Laid-Open No. Hei 10-19160 (prior art) filed and published by the present applicant. Have been proposed. In the invention described in this prior art, a valve body is installed in a cooling water pipe to an engine via a seal packing. The valve body has an annular valve seat through which cooling water can flow, and a cylindrical valve member whose outer peripheral portion is slidably brought into contact with and separated from the inner peripheral portion of the annular valve seat within a predetermined valve opening stroke range. The annular valve seat is provided with a rubber annular seal on the outer peripheral side of the cylindrical valve body where the inner peripheral portion of the annular valve seat is in sliding contact with the annular valve seat. The valve is always urged in the downstream direction by the force to maintain the valve closed state.
【０００４】また、筒状弁体は、例えば、特公昭６１−
２０６９７号公報に開示されているように、ワックス式
熱応動伸縮素子に連動させることにより、自動的に開弁
および閉弁動作が行われるように構成され、熱応動伸縮
素子は、筒状ハウジング内に冷媒循環回路に流れる冷却
水の温度変化により応動するワックスと、このワックス
の膨脹／収縮にて伸縮駆動するプランジャとを有する。A cylindrical valve element is disclosed in, for example,
As disclosed in Japanese Patent No. 20697, the valve opening and closing operations are automatically performed by interlocking with a wax-type thermally responsive expansion and contraction element. A wax responsive to a change in the temperature of the cooling water flowing through the refrigerant circuit, and a plunger driven to expand and contract by expansion / contraction of the wax.
【０００５】すなわち、上記したワックス式熱応動制御
弁は、主に、エンジンの出口側のラジエータ回路上に設
置され、エンジンからの冷却水が所望の設定温度、例え
ば、６０℃を超えると、その高温冷却水の温度上昇に伴
い、熱応動伸縮素子を構成するワックスの膨脹により、
プランジャを軸方向に伸長動作させるとともに、このプ
ランジャの伸長動作にて筒状ハウジングを相対的に移動
させ、これにより、筒状弁体をスプリングの付勢力に抗
して所定の開弁ストローク範囲で環状弁座から離間する
方向（開弁方向）に移動させるようになっている。That is, the above-mentioned wax type thermoresponsive control valve is mainly installed on the radiator circuit on the outlet side of the engine, and when the cooling water from the engine exceeds a desired set temperature, for example, 60 ° C. With the rise in the temperature of the high-temperature cooling water, the expansion of the wax constituting the thermally responsive expansion and contraction element causes
The plunger is extended in the axial direction, and the cylindrical housing is relatively moved by the extension operation of the plunger, whereby the cylindrical valve body is moved within a predetermined valve opening stroke range against the urging force of the spring. The valve is moved in a direction away from the annular valve seat (valve opening direction).
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記した従
来構造のワックス式熱応動制御弁にあっては、エンジン
からの冷却水の水温上昇速度が速くて、ウォータポンプ
の圧力が高いと、図５に実線で示すように、筒状弁体の
所定の開弁ストローク範囲Ｌにおいて、初期開弁ストロ
ーク範囲Ｌ１、例えば、３〜４ｍｍから完全開弁ストロ
ーク範囲Ｌ２、例えば、８〜１０ｍｍに至る範囲で、ラ
ジエータ内及びバイパス回路内に残量する低温な冷却水
が、例えば、２５０〜３００Ｌ（リットル）／ｍｉｎの
過剰な流量Ｑでエンジンのウオータジャケット内に一気
に流入する。これにより、水温のオーバーシュート、ハ
ンチングが発生する。特に、冬季における暖気運転時の
ように、水温ハンチングの温度幅が大きいと、エンジン
の冷却系全体に悪影響を与える。However, in the wax-type thermally responsive control valve having the conventional structure described above, if the cooling water temperature from the engine rises rapidly and the pressure of the water pump is high, FIG. As shown by a solid line, in a predetermined valve opening stroke range L of the cylindrical valve body, an initial valve opening stroke range L1, for example, from 3 to 4 mm to a complete valve opening stroke range L2, for example, a range from 8 to 10 mm. The low-temperature cooling water remaining in the radiator and the bypass circuit flows into the water jacket of the engine at a stretch at an excessive flow rate Q of, for example, 250 to 300 L (liter) / min. As a result, overshoot and hunting of the water temperature occur. In particular, when the temperature range of the water temperature hunting is large, such as during a warm-up operation in winter, the entire cooling system of the engine is adversely affected.
【０００７】そこで従来、例えば、特開平７−３０５７
８７号公報等に開示されているように、筒状弁体の外周
部側に設けたゴム製環状シールの内周面円周方向に複数
の切欠溝を上流側から下流側の冷媒流出方向に向けて形
成し、図５に点線で示すように、筒状弁体の初期開弁ス
トローク範囲Ｌ１で少量の冷却水を流出させることによ
り、エンジンのウオータジャケット内に大量の低温冷却
水が一気に流入するのを防止してなる構成を有するもの
が提案されている。しかしながら、このようなワックス
式熱応動制御弁では、筒状弁体が板金等にてプレス成型
されているため、筒状弁体の外周部に設けたゴム製環状
シールに形成される切欠溝の形状の寸法精度が出しにく
く、製品にバラツキが多い。これにより、筒状弁体の初
期開弁ストローク範囲Ｌ１での冷却水の流量が不安定と
なるばかりでなく、構造的にも３０〜４０Ｌ（リット
ル）／ｍｉｎの範囲での流量調整が限度であり、水温ハ
ンチングの発生を確実に防止することが困難である。Therefore, conventionally, for example, Japanese Patent Application Laid-Open No. Hei 7-3057
As disclosed in Japanese Patent Publication No. 87-87, a plurality of notched grooves are formed in the circumferential direction of the inner peripheral surface of the rubber annular seal provided on the outer peripheral portion side of the cylindrical valve body in the refrigerant flowing direction from the upstream side to the downstream side. As shown by the dotted line in FIG. 5, a small amount of cooling water flows out in the initial valve opening stroke range L1 of the cylindrical valve body, so that a large amount of low-temperature cooling water flows into the water jacket of the engine at once. There has been proposed a device having a configuration for preventing such a situation. However, in such a wax-type thermally responsive control valve, since the cylindrical valve body is press-molded with a sheet metal or the like, a notch groove formed in a rubber annular seal provided on an outer peripheral portion of the cylindrical valve body is used. It is difficult to obtain dimensional accuracy of the shape, and there are many variations in products. As a result, not only the flow rate of the cooling water in the initial valve opening stroke range L1 of the tubular valve body becomes unstable, but also the flow rate in the range of 30 to 40 L (liter) / min is structurally limited. Therefore, it is difficult to reliably prevent the occurrence of water temperature hunting.
【０００８】本発明は、上記した事情に鑑みてなされた
もので、筒状弁体の初期開弁ストローク範囲におけるエ
ンジンへの過剰な低温冷却水の供給を防止して、水温ハ
ンチングの発生を確実に防止することができるエンジン
冷媒循環回路用ワックス式熱応動制御弁を提供すること
を目的とする。The present invention has been made in view of the above circumstances, and prevents the supply of excessive low-temperature cooling water to an engine in the initial valve opening stroke range of a cylindrical valve body, thereby ensuring the occurrence of water temperature hunting. It is an object of the present invention to provide a wax-type thermally responsive control valve for an engine refrigerant circulation circuit that can prevent the above problem.
【０００９】[0009]
【課題を解決するための手段】上記した課題を解決する
ために、本発明は、エンジン冷媒循環回路上に設置され
る弁本体からなり、弁本体は、冷媒が通水可能な環状弁
座と、環状弁座の内周部にその外周部が所定の開弁スト
ローク範囲で摺接して接離自在に開閉動作する筒状弁体
と、筒状弁体を冷媒の温度に応じて駆動させるワックス
式熱応動伸縮素子とを有するとともに、筒状弁体と環状
弁座との摺接面間にゴム製環状シールを介在してなるエ
ンジン冷媒循環回路用ワックス式熱応動制御弁におい
て、環状弁座の内周部側にゴム製環状シールを加硫成型
にて一体に設け、ゴム製環状シールの内周面には円周方
向に所望の間隔を置いて筒状弁体の初期開弁ストローク
範囲で少量の冷媒が流出可能な複数の切欠溝を上流側か
ら下流側の冷媒流出方向に向けて形成してなることを特
徴とする。In order to solve the above problems, the present invention comprises a valve body installed on an engine refrigerant circuit, wherein the valve body has an annular valve seat through which refrigerant can flow. A cylindrical valve body whose outer peripheral portion slides on and contacts the inner peripheral portion of the annular valve seat within a predetermined valve opening stroke range so as to freely open and close, and a wax for driving the cylindrical valve body in accordance with the temperature of the refrigerant; A wax-type thermally responsive control valve for an engine refrigerant circuit, comprising a rubber thermal seal between a sliding surface of a tubular valve body and an annular valve seat, the thermal valve having an annular valve seat. A rubber annular seal is integrally provided on the inner peripheral side by vulcanization molding, and the inner peripheral surface of the rubber annular seal is circumferentially spaced at a desired distance from the initial valve opening stroke range of the cylindrical valve body. Through a plurality of notched grooves through which a small amount of refrigerant can flow out from upstream to downstream And characterized by being formed toward the direction.
【００１０】ここで、本発明において、上記ゴム製環状
シールの内周面略中間部に、前記筒状弁体の摺接面に摺
接する内向き凸部を円周方向に一体に突出形成し、内向
き凸部を境として、各切欠溝の先端部側の一部を冷媒流
出方向の下流側に位置するように設けてなるものであ
る。この場合、切欠溝の形状は、冷媒流出方向に向けて
均等幅な矩形状の形態、または、先端部がＲ面の略逆Ｕ
字形状の形態、あるいは、冷媒流出方向に向けて先端部
が先細の三角形状の形態を有する。前記各切欠溝は、冷
媒流出方向（下流側）に向けて横断面積が漸次小さくな
る形態とすると、開弁初期において微量の冷媒を下流方
向にながすことができる。In the present invention, an inwardly projecting portion which is in sliding contact with the sliding contact surface of the cylindrical valve body is formed at a substantially middle portion of the inner peripheral surface of the rubber annular seal so as to protrude integrally in the circumferential direction. The cutout groove is provided such that a part of the notch groove on the tip end side is located on the downstream side in the refrigerant outflow direction with the inward convex portion as a boundary. In this case, the shape of the notch groove is a rectangular shape having a uniform width in the refrigerant outflow direction, or the tip portion is substantially inverted U of the R surface.
It has a U-shape or a triangular shape whose tip is tapered in the refrigerant outflow direction. When each of the cutout grooves is configured such that the cross-sectional area gradually decreases in the refrigerant outflow direction (downstream side), a small amount of refrigerant can flow in the downstream direction in the early stage of valve opening.
【００１１】すなわち、本発明は、上記した構成を採用
することにより、環状弁座の内周部側にゴム製環状シー
ルを加硫一体成型にて一体に設けてなるため、切欠溝を
金型にてゴム製環状シールの加硫成型と共に成型するこ
とが可能になり、切欠溝の形状の寸法精度が向上し、筒
状弁体の初期開弁ストローク範囲での冷却水の流量が微
小流量でも安定する。前記のように、切欠溝を金型にて
ゴム製環状シールの加硫成型と共に成型するので、従前
のような製品のバラツキを少なくすることが可能にな
る。That is, according to the present invention, by adopting the above-described structure, a rubber annular seal is integrally provided on the inner peripheral side of the annular valve seat by integral vulcanization molding. It is possible to mold together with the vulcanization molding of the rubber annular seal, improve the dimensional accuracy of the shape of the notch groove, and even if the flow rate of the cooling water in the initial valve opening stroke range of the cylindrical valve is very small Stabilize. As described above, since the notch groove is formed together with the vulcanization molding of the rubber annular seal by the mold, it is possible to reduce the variation in the product as before.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図１
から図４に示す図面を参照しながら詳細に説明する。図
１は、本発明に係るエンジン冷媒循環回路用ワックス式
熱応動制御弁の全体構成を概略的に示し、エンジン冷媒
循環回路を形成する管路Ｐ内に設置される弁本体１から
なる。この弁本体１は上部ケーシング１ａと下部ケーシ
ング１ｂと前記各ケーシングを固定するための環状部材
１ｃとから構成されており、前記環状部材１ｃの外周部
の固定用フランジ３ａに管路Ｐ内に水密的に組み付けら
れるシールパッキン２を有するとともに、前記環状部材
１ｃの内周部には、冷却水Ｗが通水可能な環状弁座３を
備えており、前記外周部の固定用フランジ３ａにシール
パッキン２を固着してなる構成を有する。FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to the drawings shown in FIGS. FIG. 1 schematically shows the entire configuration of a wax-type thermally responsive control valve for an engine refrigerant circulation circuit according to the present invention, and comprises a valve body 1 installed in a pipe P forming an engine refrigerant circulation circuit. The valve body 1 is composed of an upper casing 1a, a lower casing 1b, and an annular member 1c for fixing each of the casings. In addition to the seal gasket 2 which is assembled in a fixed manner, an annular valve seat 3 through which the cooling water W can pass is provided on the inner peripheral portion of the annular member 1c, and the seal gasket is attached to the fixing flange 3a of the outer peripheral portion. 2 is fixed.
【００１３】また、前記環状部材１ｃは、図３に示すよ
うに、鋼板にプレス加工が施されて、円環状の固定用フ
ランジ３ａと、そのフランジ３ａの内周に上向きに屈折
連設された縦筒４と、その縦筒３ｄの上端に内向きに屈
折連設された上部フランジ３ｅとが構成されている。前
記縦筒４に多数の連通孔３ｆが縦筒４の周囲方向に間隔
をおいて設けられ、前記縦筒４の内面および上部フラン
ジ３ｅの下面に固着されたシール用環状ゴム材本体５ｂ
と、縦筒４の外周面と上部フランジ３ｅおよび固定用フ
ランジ３ａの内周部側に固着された補助環状ゴム材５ｃ
とは、前記連通孔３ｆ内に充填されたゴム材を介して結
合されてゴム製環状シール５が構成されている。As shown in FIG. 3, the annular member 1c is formed by pressing a steel plate to form an annular fixing flange 3a and an upwardly refracting connection to the inner periphery of the flange 3a. A vertical cylinder 4 and an upper flange 3e refractingly connected inward to the upper end of the vertical cylinder 3d are formed. A large number of communication holes 3f are provided in the vertical cylinder 4 at intervals in the circumferential direction of the vertical cylinder 4, and a sealing annular rubber material body 5b fixed to the inner surface of the vertical cylinder 4 and the lower surface of the upper flange 3e.
And an auxiliary annular rubber material 5c fixed to the outer peripheral surface of the vertical cylinder 4, the upper flange 3e, and the inner peripheral side of the fixing flange 3a.
Are connected via a rubber material filled in the communication hole 3f to form a rubber annular seal 5.
【００１４】前記環状部材１ｃの内周部３ｂには、図２
に示すように、筒状の起立片からなる縦筒４が円周方向
に沿って一体に立上り形成され、この縦筒４には、前記
シール用環状ゴム材本体５ｃの一部を縦筒４と固定用フ
ランジ３ａとの接続部の下面３ｃ側に回り込ませてなる
ゴム製環状弁座３が一体成型により固着されている。FIG. 2 shows an inner peripheral portion 3b of the annular member 1c.
As shown in FIG. 3, a vertical cylinder 4 made of a cylindrical upright piece is integrally formed along the circumferential direction, and a part of the sealing annular rubber material main body 5c is attached to the vertical cylinder 4. A rubber annular valve seat 3 which is wound around the lower surface 3c side of the connection portion between the fixing flange 3a and the fixing flange 3a is fixed by integral molding.
【００１５】前記ゴム製環状シール５の内周面５ａに
は、上流側と下流側との間の冷媒流出方向Ｙの中間部
（図示の場合は略中央部）に縦断面ほぼく字状の内向き
凸部（リップ部）６を円周方向に一体に突出形成してな
るとともに、複数の切欠溝７が円周方向に所望の間隔
（図示の場合は９０度の等角度間隔をおいて４つ）を置
いて形成され、これら各切欠溝７の先端部７ａ側は、内
向き凸部６を境として、その一部を冷媒流出方向Ｙの下
流側に臨ませている。すなわち、筒状内周面５ａに接続
し、上流方向から下流方向に向かって漸次内側に突出す
るように傾斜する上流側傾斜面６ａと、これに屈折した
状態で接続し上流方向から下流方向に拡径するように傾
斜して内周面５ａに接続する下流側傾斜面６ｂとを備え
ており、前記切欠溝７の先端部は下流側傾斜面６ｂより
もさらに下流側に越した位置の筒状内周面５ａに位置し
ている。また前記各切欠溝７の横断面は下流方向に向か
って漸次小さくなるように設けられている。前記内向き
凸部６は筒状弁体８における後記の摺接片８ｂに当接し
た状態では、０．２ｍｍ〜０．４ｍｍ程度押し潰された
状態で当接される。An inner peripheral surface 5a of the rubber annular seal 5 has a substantially rectangular vertical cross section at an intermediate portion (substantially central portion in the drawing) between the upstream side and the downstream side in the refrigerant outflow direction Y. An inward convex portion (lip portion) 6 is integrally formed so as to protrude in the circumferential direction, and a plurality of notched grooves 7 are arranged at desired intervals in the circumferential direction (in the illustrated case, at equal angular intervals of 90 degrees). Four notches) are formed, and the front end portion 7a side of each notch groove 7 has a part facing the downstream side in the refrigerant outflow direction Y with the inward convex portion 6 as a boundary. That is, an upstream inclined surface 6a connected to the cylindrical inner peripheral surface 5a and inclined so as to gradually project inward from the upstream direction to the downstream direction, and connected in a bent state to the upstream inclined surface 6a from the upstream direction to the downstream direction. A downstream inclined surface 6b which is inclined so as to expand the diameter and is connected to the inner peripheral surface 5a, and a tip end of the cutout groove 7 is located further downstream than the downstream inclined surface 6b. It is located on the inner peripheral surface 5a. The cross section of each of the notches 7 is provided so as to gradually decrease in the downstream direction. When the inward convex portion 6 is in contact with a sliding contact piece 8b described later in the tubular valve body 8, the inward convex portion 6 is contacted while being crushed by about 0.2 mm to 0.4 mm.
【００１６】一方、環状部材１ｃの内周部３ｂには、筒
状弁体８が配置され、この筒状弁体８の下流側外周部に
は、フランジ部８ａと、このフランジ部８ａから鉛直方
向に立ち上がる筒状の摺接片８ｂとが形成されている。
そして、筒状弁体８は、下部ケーシング１ｂと前記筒状
弁体８間に圧縮した状態で介在された圧縮コイルばねか
らなるスプリング９により、常に冷媒流出方向Ｙの下流
側方向に付勢され、そのフランジ部８ａを環状部材１ｃ
の上流側下面３ｃ側に固着したゴム製環状シール５の一
部の環状弁座面を間に介して当接させてなるとともに、
その筒状の摺接片８ｂを環状部材１ｃの内周部３ｂに固
着したゴム製環状シール５の内周面５ａ側の前記内向き
凸部６に摺接させることにより、環状弁座３に対して閉
弁状態が維持されるようになっている。On the other hand, a cylindrical valve element 8 is disposed on the inner peripheral part 3b of the annular member 1c, and on the downstream outer peripheral part of the cylindrical valve element 8, a flange part 8a and a vertical part from the flange part 8a. A cylindrical sliding contact piece 8b that rises in the direction is formed.
The tubular valve body 8 is always urged in the downstream direction in the refrigerant outflow direction Y by a spring 9 composed of a compression coil spring interposed between the lower casing 1b and the tubular valve body 8 in a compressed state. , The flange 8a is connected to the annular member 1c.
And a portion of the annular valve seat surface of the rubber annular seal 5 fixed to the upstream lower surface 3c side thereof is interposed therebetween.
The cylindrical sliding contact piece 8b is brought into sliding contact with the inwardly protruding portion 6 on the inner peripheral surface 5a side of the rubber annular seal 5 fixed to the inner peripheral portion 3b of the annular member 1c, so that the annular valve seat 3 is brought into contact with the annular valve seat 3. On the other hand, the valve closing state is maintained.
【００１７】また、筒状弁体８には、ワックス式熱応動
伸縮素子１０が組み付けられ、この熱応動伸縮素子１０
は、筒状ハウジング１１内に冷媒循環回路に流れる冷却
水Ｗの温度変化により応動するワックス１２と、このワ
ックス１２の膨脹／収縮にてゴム製底付きスリーブを介
して伸縮（進退）駆動するプランジャ１３とを有する。
すなわち、開弁時には、熱応動伸縮素子１０を構成する
ワックス１２の冷却水Ｗの温度上昇に伴う膨脹により、
プランジャ１３が軸方向に伸長動作する。そして、この
プランジャ１３の伸長動作にて筒状ハウジング１１が相
対的に上流側に移動し、筒状弁体８をスプリング９の付
勢力に抗して所定の開弁ストローク範囲Ｌで環状弁座３
から離間する方向（開弁方向）Ｘに移動させることによ
り、自動的に開弁動作が行われるようになっている。A wax-type thermally responsive expansion / contraction element 10 is mounted on the cylindrical valve body 8.
Is a wax 12 which responds to the temperature change of the cooling water W flowing in the refrigerant circuit in the cylindrical housing 11, and a plunger which expands / contracts (advances / retreats) via a rubber bottomed sleeve by expansion / contraction of the wax 12. 13.
That is, when the valve is opened, the expansion of the wax 12 constituting the thermally responsive expansion / contraction element 10 due to the temperature rise of the cooling water W causes
The plunger 13 extends in the axial direction. Then, the cylindrical housing 11 moves relatively upstream by the extension operation of the plunger 13, and the cylindrical valve element 8 moves the annular valve seat 8 within a predetermined valve opening stroke range L against the urging force of the spring 9. 3
By moving in the direction (valve opening direction) X away from the valve, the valve opening operation is automatically performed.
【００１８】ところで、上記したような弁本体１に組み
付けられる環状部材１ｃの外周端縁部３ａ及び内周部３
ｂの縦筒４には、図３に示すように、金型（図示せず）
を用いた加硫一体成型により、シールパッキン２及びゴ
ム製環状シール５を一体に成型し固着すると同時に、ゴ
ム製環状シール５に切欠溝７を金型成型している。これ
により、ゴム製環状シール５に形成される切欠溝７の形
状の寸法精度を向上させることが可能になるとともに、
製品のバラツキも少ない。The outer peripheral edge 3a and the inner peripheral portion 3 of the annular member 1c assembled to the valve body 1 as described above.
As shown in FIG. 3, a metal mold (not shown)
The seal packing 2 and the rubber annular seal 5 are integrally molded and fixed by vulcanization integral molding using the method described above, and at the same time, the notch groove 7 is molded in the rubber annular seal 5. Thereby, it becomes possible to improve the dimensional accuracy of the shape of the notch groove 7 formed in the rubber annular seal 5, and
There is little product variation.
【００１９】この場合、切欠溝７の形状は、図４（Ａ）
に示すような冷媒流出方向Ｙに向けて等幅な矩形状の形
態、図４（Ｂ）に示すような下流側先端部７ａがＲ面の
略逆Ｕ字形状の形態、あるいは、図４（Ｃ）に示すよう
な冷媒流出方向Ｙに向けて下流側先端部７ａが先細の三
角形状などの任意の形態に変化させて形成するととも
に、切欠溝７の深さ及び幅寸法や、数などを調整するこ
とにより、冷却水Ｗの流量Ｑを容易に調整することが可
能になる。しかも、図４（Ａ），（Ｂ），（Ｃ）の形態
にそれぞれ対応させて、図５に１点破線Ａ、２点破線Ｂ
及び３点破線Ｃで示すように、筒状弁体８の開弁ストロ
ーク範囲Ｌにおいて、初期開弁ストローク範囲Ｌ１から
完全開弁ストローク範囲Ｌ２に至る範囲での冷却水Ｗの
流量Ｑが、例えば、３〜１０Ｌ（リットル）／ｍｉｎの
範囲で流出させることが可能になるとともに、図５に実
線及び点線で示すような従来のワックス式熱応動制御弁
のそれよりも安定して流出させることが可能になる。In this case, the shape of the notch groove 7 is as shown in FIG.
As shown in FIG. 4 (B), the downstream end portion 7a has a substantially inverted U-shape with an R surface as shown in FIG. 4 (B). C) The downstream end portion 7a is formed by changing the downstream end portion 7a into an arbitrary shape such as a tapered triangular shape in the refrigerant outflow direction Y as shown in C), and the depth, width, number, and the like of the cutout grooves 7 are changed. By adjusting, the flow rate Q of the cooling water W can be easily adjusted. Further, corresponding to the forms of FIGS. 4A, 4B and 4C, FIG.
As shown by a three-dot broken line C, in the valve opening stroke range L of the cylindrical valve element 8, the flow rate Q of the cooling water W in the range from the initial valve opening stroke range L1 to the complete valve opening stroke range L2 is, for example, 5 to 10 L (liter) / min, and can be discharged more stably than that of the conventional wax-type thermally responsive control valve as shown by a solid line and a dotted line in FIG. Will be possible.
【００２０】前記実施形態においては、上流側から下流
方向に一様に傾斜する切欠溝７の形態を示したが、本発
明を実施する場合、図６に示すように、縦断面におい
て、上流側が深くほぼ垂直に近い急傾斜面７ｂと、内向
き凸部６を越したあたりから内周面側に屈折した緩傾斜
面７ｃを有する切欠溝７としてもよく、このようにする
と、切欠溝７の上流側の容積が大きくなるので、下流側
に流出する冷媒量を、初期の開弁状態でもさらに安定さ
せることができる。In the above-described embodiment, the form of the notch groove 7 which is uniformly inclined from the upstream side to the downstream side is shown. However, when the present invention is carried out, as shown in FIG. The notch groove 7 may have a steeply inclined surface 7b which is deep and almost vertical, and a gentlely inclined surface 7c which is bent toward the inner peripheral surface from around the inward convex portion 6. In this case, the notched groove 7 Since the volume on the upstream side increases, the amount of refrigerant flowing to the downstream side can be further stabilized even in the initial valve opening state.
【００２１】本発明を実施する場合、前記内向き凸部６
としては、鈍角倒Ｖ字状または台形断面としてもよく、
また前記切欠部７を１つまたは２つ以上の偶数または奇
数の数だけ等角度または適宜の間隔をおいて設けるよう
にしてもよい。In practicing the present invention, the inward convex portion 6
As an obtuse angled V-shaped or trapezoidal cross section,
Further, the notches 7 may be provided at equal angles or at an appropriate interval of one or more even or odd numbers.
【００２２】[0022]
【発明の効果】以上説明したように、本発明に係るエン
ジン冷媒循環回路用ワックス式熱応動制御弁は、環状弁
座の内周部側にゴム製環状シールを加硫成型にて一体に
設けてなることから、環状弁座へのゴム製環状シールの
加硫成型時、切欠溝を金型にて成型することができる。
これにより、切欠溝の形状の寸法精度を向上させること
ができ、従前のような製品のバラツキを少なくすること
ができる。これにより、筒状弁体の初期開弁ストローク
範囲での冷却水の流量を少量でも安定させることができ
るため、水温ハンチングの発生を確実に防止することが
できる。また、切欠溝の形状を変化させることにより、
冷却水の流量を容易に調整することができる。As described above, the wax-type thermally responsive control valve for an engine refrigerant circulation circuit according to the present invention has a rubber annular seal integrally provided on the inner peripheral side of the annular valve seat by vulcanization molding. Therefore, when vulcanizing and molding the rubber annular seal to the annular valve seat, the notch groove can be molded by a mold.
As a result, the dimensional accuracy of the shape of the notch groove can be improved, and the variation in products as before can be reduced. This makes it possible to stabilize the flow rate of the cooling water in the initial valve opening stroke range of the cylindrical valve body even with a small amount, so that the occurrence of water temperature hunting can be reliably prevented. Also, by changing the shape of the notch groove,
The flow rate of the cooling water can be easily adjusted.
【図１】本発明に係るエンジン冷媒循環回路用ワックス
式熱応動制御弁の全体構成を概略的に示す説明図であ
る。FIG. 1 is an explanatory view schematically showing an overall configuration of a wax-type thermally responsive control valve for an engine refrigerant circulation circuit according to the present invention.
【図２】同じく環状弁座と筒状弁体との摺接面間におけ
る要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part between sliding contact surfaces between an annular valve seat and a cylindrical valve body.
【図３】同じく環状弁座へのシールパッキン及びゴム製
環状シールの加硫成型による添着状態を示す要部断面図
である。FIG. 3 is a sectional view of a principal part showing a state in which a seal packing and a rubber annular seal are attached to an annular valve seat by vulcanization molding.
【図４】図４（Ａ），（Ｂ），（Ｃ）はゴム製環状シー
ルに形成される切欠溝の形態を示す説明図である。4 (A), 4 (B), and 4 (C) are explanatory views showing forms of cutout grooves formed in a rubber annular seal.
【図５】同じく筒状弁体の開弁ストローク範囲での冷却
水の流量を従来のワックス式熱応動制御弁と比較して示
す説明図である。FIG. 5 is an explanatory diagram showing a flow rate of cooling water in a valve opening stroke range of a cylindrical valve body in comparison with a conventional wax-type thermally responsive control valve.
【図６】切欠溝の変形形態を示す説明断面図である。FIG. 6 is an explanatory sectional view showing a modified form of the notch groove.
１ 弁本体 １ａ 上部ケーシング １ｂ 下部ケーシング １ｃ 環状部材 ２ シールパッキン ３ 環状弁座 ３ａ 固定用環状フランジ ３ｂ 内周部 ３ｃ 下面 ４ 縦筒 ５ ゴム製環状シール ５ａ 内周面 ５ｂ シール用環状ゴム材本体 ５ｃ 補助環状ゴム材 ６ 内向き凸部 ６ａ 上流側傾斜面 ６ｂ 下流側傾斜面 ７ 切欠溝 ７ａ 先端部 ７ｂ 急傾斜面 ７ｃ 緩傾斜面 ８ 筒状弁体 ８ａ フランジ部 ８ｂ 摺接片 ９ スプリング １０ 熱応動伸縮素子 １１ 筒状ハウジング １２ ワックス １３ プランジャ Ｌ 筒状弁体の開弁ストローク範囲 Ｌ１ 筒状弁体の初期開弁ストローク範囲 Ｌ２ 筒状弁体の完全開弁ストローク範囲 Ｐ 冷媒循環回路（管路） Ｑ 冷媒の流量 Ｗ 冷媒（冷却水） Ｘ 開弁方向 Ｙ 冷媒流出方向 DESCRIPTION OF SYMBOLS 1 Valve main body 1a Upper casing 1b Lower casing 1c Annular member 2 Seal packing 3 Annular valve seat 3a Fixing annular flange 3b Inner peripheral portion 3c Lower surface 4 Vertical cylinder 5 Rubber annular seal 5a Inner peripheral surface 5b Sealing annular rubber material body 5c Auxiliary annular rubber material 6 Inward convex portion 6a Upstream inclined surface 6b Downstream inclined surface 7 Notch groove 7a Tip portion 7b Steeply inclined surface 7c Slightly inclined surface 8 Cylindrical valve body 8a Flange portion 8b Sliding contact piece 9 Spring 10 Thermally responsive Telescopic element 11 Cylindrical housing 12 Wax 13 Plunger L Cylindrical valve body opening stroke range L1 Cylindrical valve body initial valve opening stroke range L2 Cylindrical valve body completely opening stroke range P Refrigerant circulation circuit (line) Q Refrigerant flow rate W Refrigerant (cooling water) X Valve opening direction Y Refrigerant outflow direction
Claims (6)
本体からなり、該弁本体は、冷媒が通水可能な環状弁座
と、該環状弁座の内周部にその外周部が所定の開弁スト
ローク範囲で摺接して接離自在に開閉動作する筒状弁体
と、該筒状弁体を冷媒の温度に応じて駆動させるワック
ス式熱応動伸縮素子とを有するとともに、前記筒状弁体
と環状弁座との摺接面間にゴム製環状シールを介在して
なるエンジン冷媒循環回路用ワックス式熱応動制御弁に
おいて、 前記環状弁座の内周部側にゴム製環状シールを加硫成型
にて一体に設け、該ゴム製環状シールの内周面には円周
方向に所望の間隔を置いて前記筒状弁体の初期開弁スト
ローク範囲で少量の冷媒が流出可能な複数の切欠溝を上
流側から下流側の冷媒流出方向に向けて形成してなるこ
とを特徴とするエンジン冷媒循環回路用ワックス式熱応
動制御弁。The valve body is provided on an engine refrigerant circuit. The valve body has an annular valve seat through which refrigerant can flow, and an inner peripheral portion of the annular valve seat having a predetermined outer peripheral portion. A tubular valve body that slides and opens and closes freely in a valve-opening stroke range, and a wax-type thermally responsive expansion / contraction element that drives the tubular valve body in accordance with the temperature of the refrigerant; In a wax-type thermally responsive control valve for an engine refrigerant circuit in which a rubber annular seal is interposed between sliding surfaces of a body and an annular valve seat, a rubber annular seal is added to an inner peripheral side of the annular valve seat. Provided integrally by sulfuration molding, a plurality of pipes through which a small amount of refrigerant can flow out in the initial valve opening stroke range of the cylindrical valve body at a desired interval in the circumferential direction on the inner peripheral surface of the rubber annular seal. The cutout groove is formed from the upstream side to the refrigerant outflow direction on the downstream side. Engine coolant circulation circuit for the wax-type thermally-actuated control valve that.
に、前記筒状弁体の摺接面に摺接する内向き凸部を円周
方向に一体に突出形成し、該内向き凸部を境として、前
記各切欠溝の先端部側の一部を冷媒流出方向の下流側に
位置するように設けてなることを特徴とする請求項１に
記載のエンジン冷媒循環回路用制御熱応動制御弁。2. An inwardly protruding portion which is slidably in contact with a slidably contacting surface of the cylindrical valve body is formed at a substantially middle portion of an inner peripheral surface of the rubber annular seal so as to integrally project in a circumferential direction, and the inwardly convex portion is formed. The control thermal response for an engine refrigerant circulation circuit according to claim 1, wherein a part of a front end portion of each of the notch grooves is provided on a downstream side in a refrigerant outflow direction with the boundary as a boundary. Control valve.
幅な矩形状の形態を有することを特徴とする請求項１ま
たは２に記載のエンジン冷媒循環回路用ワックス式熱応
動制御弁。3. The wax-type thermally responsive control valve for an engine refrigerant circuit according to claim 1, wherein the notch groove has a rectangular shape having an equal width in a refrigerant outflow direction.
形状の形態を有することを特徴とする請求項１または２
に記載のエンジン冷媒循環回路用ワックス式熱応動制御
弁。4. The notch groove has a front end in a substantially inverted U-shape with an R surface.
3. A wax-type thermally responsive control valve for an engine refrigerant circuit according to claim 1.
端部が先細の三角形状の形態を有することを特徴とする
請求項１または２に記載のエンジン冷媒循環回路用ワッ
クス式熱応動制御弁。5. The wax-type thermal response control for an engine refrigerant circuit according to claim 1, wherein the notch groove has a triangular shape whose tip is tapered in a refrigerant outflow direction. valve.
断面積が漸次小さくなる形態を有することを特徴とする
請求項１または２に記載のエンジン冷媒循環回路用ワッ
クス式熱応動制御弁。6. The wax-type thermally responsive control valve for an engine refrigerant circuit according to claim 1, wherein the notch groove has a shape in which a cross-sectional area gradually decreases in a refrigerant outflow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000193844A JP3545997B2 (en) | 2000-06-28 | 2000-06-28 | Wax-type thermoresponsive control valve for engine refrigerant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000193844A JP3545997B2 (en) | 2000-06-28 | 2000-06-28 | Wax-type thermoresponsive control valve for engine refrigerant circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002004859A true JP2002004859A (en) | 2002-01-09 |
| JP3545997B2 JP3545997B2 (en) | 2004-07-21 |
Family
ID=18692763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000193844A Expired - Lifetime JP3545997B2 (en) | 2000-06-28 | 2000-06-28 | Wax-type thermoresponsive control valve for engine refrigerant circuit |
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| Country | Link |
|---|---|
| JP (1) | JP3545997B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005351123A (en) * | 2004-06-09 | 2005-12-22 | Nissan Motor Co Ltd | Thermostat and vehicle cooling circuit having thermostat |
| CN110475998A (en) * | 2017-04-07 | 2019-11-19 | Nok株式会社 | The open and close valve of thermostat device constructs |
-
2000
- 2000-06-28 JP JP2000193844A patent/JP3545997B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005351123A (en) * | 2004-06-09 | 2005-12-22 | Nissan Motor Co Ltd | Thermostat and vehicle cooling circuit having thermostat |
| CN110475998A (en) * | 2017-04-07 | 2019-11-19 | Nok株式会社 | The open and close valve of thermostat device constructs |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3545997B2 (en) | 2004-07-21 |
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