JPH10169515A - Exhaust gas reflux control valve - Google Patents
Exhaust gas reflux control valveInfo
- Publication number
- JPH10169515A JPH10169515A JP8328205A JP32820596A JPH10169515A JP H10169515 A JPH10169515 A JP H10169515A JP 8328205 A JP8328205 A JP 8328205A JP 32820596 A JP32820596 A JP 32820596A JP H10169515 A JPH10169515 A JP H10169515A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- exhaust gas
- valve seat
- seat member
- gas recirculation
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/68—Closing members; Valve seats; Flow passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車用内燃機関
の排気ガス還流システムに用いられる排気ガス還流制御
弁に関する。The present invention relates to an exhaust gas recirculation control valve used for an exhaust gas recirculation system of an internal combustion engine for a vehicle.
【０００２】[0002]
【従来の技術】従来、排気ガス環流制御弁として、例え
ば、特開平7−190226 号や特開平7−332168号が知られ
ている。2. Description of the Related Art Conventionally, as an exhaust gas recirculation control valve, for example, JP-A-7-190226 and JP-A-7-332168 are known.
【０００３】これら環流制御弁の弁座部材は、おおよそ
環状に形成されており、またこの弁座部材には、一つの
オリフィスとそれに連なる弁座が設けられており、この
弁座部材はバルブボディの通路穴の一断面に装着された
形で固定されているのが一般的である。[0003] The valve seat member of these recirculation control valves is formed in a substantially annular shape, and the valve seat member is provided with one orifice and a valve seat connected to the orifice. Is generally mounted and fixed to one section of the passage hole.
【０００４】また特開平2−185657 号には、弁座部材を
薄板状の板金形状で環状に形成した例が記載されている
が、この場合も弁座部材には、一つのオリフィスとそれ
に連なる弁座が設けられており、この弁座部材はバルブ
ボディの通路穴の一断面に装着された形で固定されてい
る。Japanese Patent Application Laid-Open No. 2-185657 discloses an example in which a valve seat member is formed in the shape of a thin plate-like sheet metal in a ring shape. A valve seat is provided, and the valve seat member is fixed so as to be mounted on one cross section of the passage hole of the valve body.
【０００５】上記弁座部材をバルブボディに固定する場
合、一般的には固定部の気密性を確保し、固定部からの
ガスの洩れをできるだけ少なくする必要があるため旋盤
等により切削加工したものを溶接あるいはねじ込み、更
には圧入または、加締めにより固定している。When the above-mentioned valve seat member is fixed to the valve body, it is generally necessary to secure the airtightness of the fixed portion and to reduce gas leakage from the fixed portion as much as possible. Are fixed by welding or screwing, and further press-fitting or crimping.
【０００６】更に弁座部材の脱落防止法としては、上記
特開平7−332168 号に記載のように、前記の弁座部材と
バルブボディの固定方法に併用して、弁座部材をバルブ
ボディ側から出した押しねじやピンで固定する方法が知
られている。Further, as a method for preventing the valve seat member from falling off, as described in the above-mentioned Japanese Patent Application Laid-Open No. 7-332168, the method for fixing the valve seat member and the valve body is used so that the valve seat member is disposed on the valve body side. A method of fixing with a push screw or a pin protruded from a maker is known.
【０００７】また従来一般的に、弁座を有する弁座部材
と、バルブ軸を案内するガイド部材とは、それぞれ別々
にバルブボディに固定されるのが普通であった。Conventionally, a valve seat member having a valve seat and a guide member for guiding a valve shaft are usually separately fixed to a valve body.
【０００８】また弁の制御上、弁座部材とバルブボディ
の、軸方向の相対位置の調整が必要な場合、具体的には
例えば制御モータがイニシャル位置にあるときのモータ
軸下端面と、バルブが全閉位置または全開位置にあると
きのバルブ軸上端面との間の、軸方向隙間を調整する場
合は、特開平7−332168 号のようにモータケースとバル
ブボディの間に、積層されたスペーサ部材を入れたり、
モータ軸の軸長を変えたりするなどの方法が知られてい
る。When the relative position of the valve seat member and the valve body needs to be adjusted in the axial direction in controlling the valve, specifically, for example, the lower end surface of the motor shaft when the control motor is at the initial position, When adjusting the axial gap between the valve case and the valve shaft upper end surface when the valve is in the fully closed position or the fully open position, as shown in Japanese Patent Application Laid-Open No. 7-332168, Put a spacer member,
Methods such as changing the length of the motor shaft are known.
【０００９】[0009]
【発明が解決しようとする課題】排気ガス還流制御弁内
は、エンジンで燃焼後の高温のガスが通過するため、そ
のバルブ部も非常に高い温度にさらされる。そのため従
来のように、弁座部材が単に環状に形成されたものでは
高温にさらされ、バルブボディと弁座部材の結合の信頼
性が大きな問題となる。特に軽量化のために、バルブボ
ディの材質としてアルミニウム材などを使う場合など
は、一般的にステンレス材などを使う弁座部材との材質
のちがいからくる、線膨張係数の差が要因となり、高温
状態で弁座部材が脱落しないように固定するのが非常に
難しくなる。またバルブボディへの弁座部材の取付け方
法によっては、わざわざ弁座部材組付け作業のための捨
て穴を設け、後でこの穴をふさぐなどのむだな工程が必
要になったりする。In the exhaust gas recirculation control valve, a high temperature gas after combustion in the engine passes therethrough, so that the valve portion is also exposed to a very high temperature. Therefore, if the valve seat member is simply formed in a ring shape as in the related art, the valve seat member is exposed to a high temperature, and the reliability of the connection between the valve body and the valve seat member becomes a serious problem. In particular, when using aluminum as the material of the valve body to reduce the weight, the difference in linear expansion coefficient due to the difference in the material from the valve seat member generally using stainless steel etc. In this state, it is very difficult to fix the valve seat member so as not to fall off. Further, depending on the method of attaching the valve seat member to the valve body, a wasteful hole for assembling the valve seat member may be provided, and a wasteful step of closing the hole later may be required.
【００１０】また、バルブが閉弁状態にあるときの気密
性は、エンジンの燃焼状態を制御する上での重要な性能
の一つであり、そのためには、閉弁状態にあるバルブ部
の弁座と弁体の接触部からのガス洩れを極めて少なく抑
えることが必要である。Airtightness when the valve is in a closed state is one of important performances in controlling the combustion state of the engine. It is necessary to minimize gas leakage from the contact portion between the seat and the valve element.
【００１１】また、弁座部材とバルブボディの組付け部
からの洩れや、バルブボディとガイド部材の組付け部か
らの洩れもまた問題となる。[0011] Leakage from the assembly portion between the valve seat member and the valve body and leakage from the assembly portion between the valve body and the guide member also pose problems.
【００１２】更にガイド部材とバルブ軸の間には、弁座
と弁体が密着できるようにするためのがたがどうしても
必要となる。これは弁座部とガイド部の同軸精度のくる
いを、このがたで吸収するためということもでき、弁座
部とガイド部の同軸精度があまり良くないのに、ガイド
部とバルブ軸のがただけを、いたずらに小さくしようと
すると、今度はバルブ部からの大きなガス洩れが問題に
なってしまう。ところが一方では、このガイド部材とバ
ルブ軸の間の隙間からのガス洩れ量も、重要な製品特性
のひとつである。もちろんこのような隙間がまったくな
いと、バルブ軸の摺動がうまくいかなくなってしまう。
つまりガイド部材とバルブ軸の間には、バルブ部の気密
性が保て、ガイド部の摺動がスムーズにでき、しかもガ
イド部材とバルブ軸間の隙間からのガス洩れの少ない、
必要最低限の隙間が要求されるのである。Further, between the guide member and the valve shaft, it is absolutely necessary to allow the valve seat and the valve body to be in close contact with each other. This can be said to be because the backlash of the coaxial accuracy between the valve seat and the guide is absorbed by this backlash.The coaxial accuracy between the valve seat and the guide is not very good, If it is attempted to reduce only the backlash unnecessarily, large gas leakage from the valve portion will be a problem. On the other hand, the amount of gas leakage from the gap between the guide member and the valve shaft is also one of important product characteristics. Of course, if there is no such gap, sliding of the valve shaft will not be successful.
That is, between the guide member and the valve shaft, the airtightness of the valve portion can be maintained, the guide portion can slide smoothly, and gas leakage from the gap between the guide member and the valve shaft is small.
The minimum required gap is required.
【００１３】以上のような観点から従来の排気ガス還流
制御弁をみると、弁座部材とガイド部材とが、それぞれ
別々にバルブボディに固定されるため、それぞれの部品
の製作精度誤差やバルブボディの製作精度誤差、またそ
れぞれの部品のバルブボディへの組付け精度誤差の影響
で、弁座部材の弁座とガイド部材の案内穴の同軸が出に
くいという問題がある。そのため、バルブ部のシート性
が悪くなったり、またはガイド部材の案内穴とバルブ軸
のギャップを大きくとる必要が生じ、そのためガイド部
材の案内穴とバルブ軸間の隙間から多量のガスが洩れる
という問題が発生する。In view of the conventional exhaust gas recirculation control valve from the above viewpoint, the valve seat member and the guide member are separately fixed to the valve body. There is a problem that it is difficult for the valve seat of the valve seat member and the guide hole of the guide member to be coaxial due to the manufacturing accuracy error of the above and the assembly accuracy error of each part to the valve body. For this reason, the seating property of the valve portion is deteriorated, or it is necessary to increase the gap between the guide hole of the guide member and the valve shaft, so that a large amount of gas leaks from the gap between the guide hole of the guide member and the valve shaft. Occurs.
【００１４】また別の課題としては、バルブ軸を移動さ
せるための、例えばステッピングモータなどの駆動機構
の制御上のイニシャル位置、例えば機械原点などと、バ
ルブ部の開閉弁の基準位置、例えば全閉位置や全開位置
とを、どうやって合わせるかがある。従来の方法のう
ち、モータケースとバルブボディの間にスペーサ部材を
入れる方法では、普通比較的大きなスペーサ部材が必要
となる。また外周形状もモータケースやバルブボディの
形に合わせるため複雑になり、製品の機種のちがいで外
周形状を変えたりすることも必要となる。そのためスペ
ーサ部材のコストが高くなったり、多機種の組立工程が
煩雑のなったり、組立設備として複雑で高価なものが必
要になったりする。また従来の方法のうち、モータ軸の
軸長を変える方法は、普通は組み替え作業が必要とな
り、やはり組立工程が煩雑になったり、組立設備として
複雑で高価なものが必要になったりする。また従来の方
法のうち、弁座部材を溶着する位置を適切化する方法で
は、溶接による位置決め精度や、溶接の熱影響による弁
座部材や弁座や周辺の部材の変形や、組立工程内での溶
接作業性や、場合によっては捨て穴が必要になるなどの
問題がある。Another problem is that an initial position for controlling a driving mechanism such as a stepping motor for moving a valve shaft, for example, a mechanical origin, and a reference position of an on-off valve of a valve unit, for example, a fully closed position, are provided. There is a way to match the position and the fully open position. Of the conventional methods, a method of inserting a spacer member between the motor case and the valve body usually requires a relatively large spacer member. In addition, the outer peripheral shape is complicated because it conforms to the shape of the motor case and the valve body, and it is necessary to change the outer peripheral shape depending on the product model. Therefore, the cost of the spacer member increases, the assembling process of various models becomes complicated, and complicated and expensive assembling equipment is required. Of the conventional methods, the method of changing the shaft length of the motor shaft usually requires a reassembling operation, which again complicates the assembling process and requires complicated and expensive assembling equipment. Among the conventional methods, in the method of optimizing the position where the valve seat member is welded, positioning accuracy by welding, deformation of the valve seat member, the valve seat and peripheral members due to the heat effect of welding, and in the assembly process, There are problems such as the workability of welding and the necessity of discarding holes in some cases.
【００１５】また、従来の排気ガス還流制御弁は、バル
ブボディをベースとして組立作業が行われるために、バ
ルブボディの形状に制約がでてくるものがあった。具体
的には、バルブボディの下方からの組立が必要である場
合で、バルブボディの通路穴周辺の形状や方向が、自由
に設計できない問題があった。Further, in the conventional exhaust gas recirculation control valve, since the assembling work is performed on the basis of the valve body, the shape of the valve body is restricted in some cases. Specifically, when assembly from below the valve body is required, there is a problem that the shape and direction around the passage hole of the valve body cannot be freely designed.
【００１６】また、当然のことながら上記のような高信
頼を要する排気ガス還流制御弁を、安い価格で作る技術
も重要なポイントである。そのためには、部品をいかに
作りやすい形状とするか、またいかに短い工程で製造す
るか、またそれらの組立性についても組み立てやすい構
造を提案することが課題である。It is a matter of course that the technique of making the exhaust gas recirculation control valve requiring high reliability as described above at a low price is also important. For that purpose, it is an object to propose a structure which is easy to assemble a part, how to manufacture it in a short process, and an assemblability thereof.
【００１７】本発明の目的は、高温にさらされても、バ
ルブボディと弁座部材の結合の信頼性の高い排気ガス還
流制御弁を提供することである。An object of the present invention is to provide an exhaust gas recirculation control valve having a highly reliable connection between a valve body and a valve seat member even when exposed to high temperatures.
【００１８】本発明の目的は、閉弁状態にあるバルブ部
の弁座と弁体の接触部からのガス洩れを極めて少なく抑
えることのできる排気ガス還流制御弁を提供することで
ある。An object of the present invention is to provide an exhaust gas recirculation control valve capable of minimizing gas leakage from a contact portion between a valve seat and a valve element of a valve portion in a closed state.
【００１９】本発明の目的は、弁座部材とバルブボディ
の組付け部からの洩れや、バルブボディとガイド部材の
組付け部からの洩れを極めて少なく抑えることのできる
排気ガス還流制御弁を提供することである。An object of the present invention is to provide an exhaust gas recirculation control valve which can minimize leakage from an assembly portion between a valve seat member and a valve body and leakage from an assembly portion between a valve body and a guide member. It is to be.
【００２０】本発明の目的は、ガイド部材とバルブ軸間
の隙間からのガス洩れの少ない排気ガス還流制御弁を提
供することである。An object of the present invention is to provide an exhaust gas recirculation control valve with less gas leakage from a gap between a guide member and a valve shaft.
【００２１】本発明の目的は、バルブ軸を移動させるた
めの駆動機構の制御上のイニシャル位置と、バルブ部の
開閉弁の基準位置とを、簡単で低コストで標準化がで
き、しかも高品質に合わせることのできる排気ガス還流
制御弁を提供することである。An object of the present invention is to make it possible to standardize the initial position for controlling the drive mechanism for moving the valve shaft and the reference position of the opening / closing valve of the valve section simply, at low cost, and to achieve high quality. It is to provide an exhaust gas recirculation control valve that can be adjusted.
【００２２】[0022]
【課題を解決するための手段】本発明は、バルブボディ
に形成された排気ガス還流用の通路穴にガス量を調節す
るためのバルブ装置を配置し、該バルブを駆動機構によ
り開閉制御してなる排気ガス還流制御弁において、前記
バルブ装置は、弁体と係合する弁座部材をカップ状に形
成すると共に、そのカップ状部材の底面側に第１のオリ
フィスを形成した弁座を設け、更に上部開口端をバルブ
軸ガイド部材を介して前記バルブボディの通路穴内に挟
み固定したことを特徴とする排気ガス還流制御弁によっ
て達成される。According to the present invention, a valve device for adjusting a gas amount is disposed in a passage hole for exhaust gas recirculation formed in a valve body, and the valve is controlled to be opened and closed by a drive mechanism. In the exhaust gas recirculation control valve, the valve device has a valve seat member that engages with the valve body and is formed in a cup shape, and a valve seat having a first orifice formed on a bottom surface side of the cup member. The exhaust gas recirculation control valve is further characterized in that the upper open end is sandwiched and fixed in the passage hole of the valve body via a valve shaft guide member.
【００２３】本発明は、バルブボディに形成された排気
ガス還流用の通路穴にガス量を調節するためのバルブ装
置を配置し、該バルブを駆動機構により開閉制御してな
る排気ガス還流制御弁において、前記バルブ装置は、弁
体と係合する弁座部材をカップ状に形成すると共に、そ
のカップ状部材の底面側に第１のオリフィスを形成した
弁座を設け、更に上部開口端につば部を形成し、該つば
部をバルブ軸ガイド部材を介して前記バルブボディの中
央座面に挟み固定したことを特徴とする排気ガス還流制
御弁によって達成される。According to the present invention, there is provided an exhaust gas recirculation control valve in which a valve device for adjusting a gas amount is disposed in an exhaust gas recirculation passage hole formed in a valve body, and the valve is opened and closed by a driving mechanism. In the valve device, the valve seat member engaged with the valve body is formed in a cup shape, a valve seat having a first orifice formed on the bottom surface side of the cup-shaped member, and a flange is further provided on an upper opening end. The exhaust gas recirculation control valve is characterized in that a portion is formed, and the collar portion is fixed to a central seating surface of the valve body via a valve shaft guide member.
【００２４】本発明の好ましくは、弁座部材は開口端部
につば部を一体形成し、バルブボディにとりつけ固定さ
れていることを特徴する排気ガス還流制御弁よって達成
される。Preferably, the present invention is attained by an exhaust gas recirculation control valve characterized in that the valve seat member is formed integrally with a flange at an open end and is fixedly attached to a valve body.
【００２５】本発明の好ましくは、ガイド部材と弁座部
材間にダストカバーを配置固定したことを特徴とする排
気ガス還流制御弁によって達成される。Preferably, the present invention is achieved by an exhaust gas recirculation control valve characterized in that a dust cover is disposed and fixed between a guide member and a valve seat member.
【００２６】本発明の好ましくは、弁座部材はバルブボ
ディに形成されたリング状突起に圧入固定されているこ
とを特徴とする排気ガス還流制御弁によって達成され
る。Preferably, the present invention is achieved by an exhaust gas recirculation control valve, wherein the valve seat member is press-fitted and fixed to a ring-shaped projection formed on the valve body.
【００２７】本発明の好ましくは、弁座部材の上方内周
部に段部を形成し、該段部にバルブ軸ガイド部材を保持
したことを特徴とする排気ガス還流制御弁によって達成
される。[0027] Preferably, the present invention is achieved by an exhaust gas recirculation control valve characterized in that a step is formed in an upper inner peripheral portion of a valve seat member, and a valve shaft guide member is held in the step.
【００２８】本発明の好ましくは、つば部はスペーサを
介してバルブボディ固定されることを特徴とする排気ガ
ス還流制御弁によって達成される。[0028] Preferably, the present invention is achieved by an exhaust gas recirculation control valve, wherein the collar is fixed to the valve body via a spacer.
【００２９】本発明の好ましくは、弁座部材は内周部に
段部を形成し、そこにバルブ軸ガイド部材とダストカバ
ーを載置固定していることを特徴とする排気ガス還流制
御弁によって達成される。Preferably, the exhaust gas recirculation control valve according to the present invention is characterized in that the valve seat member has a step formed in the inner peripheral portion, and the valve shaft guide member and the dust cover are mounted and fixed there. Achieved.
【００３０】本発明の好ましくは、弁座部材の外周先端
部はスペーサを介してバルブボディの段部に載置固定さ
れていることを特徴とする排気ガス還流制御弁によって
達成される。Preferably, the present invention is attained by an exhaust gas recirculation control valve characterized in that an outer peripheral end of a valve seat member is mounted and fixed on a step portion of a valve body via a spacer.
【００３１】[0031]
【発明の実施の形態】以下、本発明の第１の実施例を図
面に基づき説明する。図１において排気ガス還流制御弁
１のバルブボディ１０には、排気ガス還流用の通路穴１
１が設けられていて、その通路穴には、例えばこの弁座
部材はプレス成形が好ましいが、例えば削り出し成形あ
るいは鍛造成形でも何らこれを妨げない。鋼板にて形成
されたカップ状のつば付き弁座部材１２が配設されてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a valve body 10 of the exhaust gas recirculation control valve 1 has a passage hole 1 for exhaust gas recirculation.
In the passage hole, for example, the valve seat member is preferably press-formed. However, for example, a cut-out molding or a forging molding does not hinder this. A cup-shaped flanged valve seat member 12 made of a steel plate is provided.
【００３２】この弁座部材１２の底面１２ｂには、弁座
１２ａが形成されていて、この弁座１２ａに１対のバル
ブ装置１３を構成する弁体１４が当接するように配設さ
れている。そしてバルブ装置１３は、前記排気ガス還流
用の通路穴１１を通過するガス量を調節するように作用
する。また、弁体１４にはバルブ軸１５がつながってお
り、このバルブ軸１５はガイド部材１６の案内穴１６ａ
に摺動自在に支持され、軸方向に移動自在としている。
またバルブ軸１５の一端１５ａには、バネ受け板２３を
介して戻しバネ１７が配置され、常にバルブ軸１５を軸
方向(図象上側)に移動させるような力を作用させてい
る。A valve seat 12a is formed on the bottom surface 12b of the valve seat member 12, and a valve element 14 constituting a pair of valve devices 13 is disposed so as to abut the valve seat 12a. . The valve device 13 acts to regulate the amount of gas passing through the exhaust gas recirculation passage hole 11. A valve shaft 15 is connected to the valve body 14. The valve shaft 15 is connected to a guide hole 16 a of a guide member 16.
And is slidably supported, and is movable in the axial direction.
A return spring 17 is disposed at one end 15a of the valve shaft 15 via a spring receiving plate 23, and always exerts a force to move the valve shaft 15 in the axial direction (upper side in the figure).
【００３３】前記バルブ軸１５の図象上側には、バルブ
軸１５の一端１５ａを押圧するモータ軸１９が配置さ
れ、該モータ軸はステッピングモータ１８により駆動さ
れる。前記モータ軸１９は前記戻しバネ１７の力に打ち
勝って、バルブ軸を軸方向に移動させ、バルブ装置１３
の開閉量を変化させて、通路穴１１を流れるガス量を制
御する。A motor shaft 19 for pressing one end 15a of the valve shaft 15 is disposed above the valve shaft 15 in the figure, and the motor shaft is driven by a stepping motor 18. The motor shaft 19 overcomes the force of the return spring 17 and moves the valve shaft in the axial direction.
The amount of gas flowing through the passage hole 11 is controlled by changing the opening / closing amount of the nozzle.
【００３４】このような排気ガス還流制御弁１におい
て、弁座部材１２の底面１２ｂには、第１のオリフィス
２０とそれに連なる弁座１２ａを設けており、更に、カ
ップの側面１２ｃには、第２のオリフィス２１が設けら
れている。そして、その側面１２ｃを前記バルブボディ
１０の挿入穴１０ａ内に圧入し、弁座部材１２のつば部
１２ｄをバルブボディ１０にねじ２２で固定している。
なお、このねじ２２は、弁座部材１２の抜け止めと、回
り止めの機能を備えている。In such an exhaust gas recirculation control valve 1, a first orifice 20 and a valve seat 12a connected to the first orifice are provided on a bottom surface 12b of the valve seat member 12, and a first orifice 20 is provided on a side surface 12c of the cup. Two orifices 21 are provided. The side surface 12c is press-fitted into the insertion hole 10a of the valve body 10, and the flange 12d of the valve seat member 12 is fixed to the valve body 10 with the screw 22.
The screw 22 has a function of preventing the valve seat member 12 from coming off and preventing rotation.
【００３５】本実施例の詳しくは、図２に示すようにバ
ルブボディ１０の挿入穴１０ａに、リング状の突起１０
ｂを設け、そこに弁座部材１２を圧入している。この圧
入部分はリング状突起１０ｂの先端部だけが弁座部材１
２の締め代になるため、挿入する荷重が少なくてすみ、
組立作業を簡便にすることができる。More specifically, as shown in FIG. 2, a ring-shaped protrusion 10 is inserted into an insertion hole 10a of the valve body 10 as shown in FIG.
b, and the valve seat member 12 is press-fitted therein. In this press-fit portion, only the tip end of the ring-shaped projection 10b is the valve seat member 1.
Since it becomes the interference of 2, the load to be inserted is small,
Assembly work can be simplified.
【００３６】ここで、突起の最も突出した部分の幅は、
あまり大きくせず(１mm以下程度)、圧入締め代は、実使
用時のこの周辺の最高温度（または設計許容温度限界）
とバルブボディ１０及び弁座部材１２の材質から派生す
る熱膨張率を考慮し、最高温度でも締め代が残るように
設定している。即ち、弁座部材１２を圧入した状態でリ
ング状の突起がわずかに弾性変形して弁座部材１２の側
面全周に密着される。従って、バルブボディ１０と弁座
部材１２の間からのガス洩れも小さく抑えることができ
る。また、この方法によれば、バルブボディの材質が、
例えば鋳鉄であっても、アルミニウムであっても柔軟に
対応できる利点もある。更には、リング状の突起１０ｂ
を第２のオリフィス２１を挟んで、上側と下側の両方に
設けて、二段圧入のような方法を取ると、バルブボディ
１０と弁座部材１２の間を通ってガスが図象上側へ洩れ
る不具合に対しても、大変良い防止効果があることが確
認された。Here, the width of the most protruding portion of the projection is
Not too large (about 1mm or less), the press-fit tightening allowance is the maximum temperature around this in actual use (or the allowable design temperature limit)
In consideration of the thermal expansion coefficient derived from the material of the valve body 10 and the valve seat member 12, the interference is set so as to remain at the maximum temperature. That is, when the valve seat member 12 is press-fitted, the ring-shaped projection is slightly elastically deformed and is brought into close contact with the entire periphery of the side surface of the valve seat member 12. Therefore, gas leakage from between the valve body 10 and the valve seat member 12 can be suppressed to be small. According to this method, the material of the valve body is
For example, there is an advantage that it can flexibly cope with cast iron or aluminum. Further, the ring-shaped protrusion 10b
Is provided on both the upper side and the lower side with the second orifice 21 interposed therebetween, and when a method such as two-stage press-fitting is adopted, gas flows upward between the valve body 10 and the valve seat member 12 to the upper side of the figure. It has been confirmed that there is a very good effect of preventing leakage.
【００３７】本実施例では、弁座部材１２をつば付きカ
ップ状に形成し、そのつば部１２ｄを利用してバルブボ
ディ１０にねじ２２で止めてあるので、このねじ止め部
付近は、通路穴１１から離れているため、実使用状態で
の温度が通路穴１１付近に比べかなり低い。そのためバ
ルブボディ１０と弁座部材１２の結合の信頼性および耐
久性を高めることができる。またつば部１２ｄがあるこ
とは、フェイルセーフの観点からも、万が一ねじ２２が
ゆるんでも、絶対に弁座部材１２が通路穴１１内に落下
しないような安全機能も兼ね備えている。In this embodiment, the valve seat member 12 is formed in a cup shape with a collar, and the flange portion 12d is used to fix the valve body 10 to the valve body 10 with a screw 22. 11, the temperature in the actual use state is considerably lower than that near the passage hole 11. Therefore, the reliability and durability of the connection between the valve body 10 and the valve seat member 12 can be improved. In addition, the presence of the collar portion 12d also has a safety function from the viewpoint of fail-safe so that the valve seat member 12 will never fall into the passage hole 11 even if the screw 22 is loosened.
【００３８】また、本実施例では、弁座部材１２の内面
１２ｅに直接、ガイド部材１６を固定してあるため、弁
座１２ａと案内穴１６ａとの間で精密な同軸度が確保で
きる。そのため、バルブ装置１３の気密性が、従来方式
のものより良くなった。また、良い同軸度が得られたこ
とで、案内穴１６ａとバルブ軸１５のクリアランスを小
さくしても従来のような問題を生じることがないので、
案内穴１６ａとバルブ軸１５の隙間を最小限にすること
ができた。そのため、案内穴１６ａとバルブ軸１５の間
からのガス洩れを、減少させることができる。また、案
内穴１６ａとバルブ軸１５の間の隙間が小さくできたこ
とは、図６に示すようにバルブ軸１５の軸径を太くして
も、ガス洩れ量を規定値内に入れることができるという
利点もある。従来から強度上（特にバルブ軸１５の一端
１５ａに戻しバネ１７の受け板２３を加締めにより固定
するときの、荷重を受けるため）バルブ軸１５を少しで
も太くしたいというニーズがある場合は、前記の効果は
大きい。In this embodiment, since the guide member 16 is directly fixed to the inner surface 12e of the valve seat member 12, precise coaxiality can be secured between the valve seat 12a and the guide hole 16a. For this reason, the airtightness of the valve device 13 is better than that of the conventional system. In addition, since a good coaxiality is obtained, even if the clearance between the guide hole 16a and the valve shaft 15 is reduced, the conventional problem does not occur.
The gap between the guide hole 16a and the valve shaft 15 could be minimized. Therefore, gas leakage from between the guide hole 16a and the valve shaft 15 can be reduced. In addition, the fact that the gap between the guide hole 16a and the valve shaft 15 can be reduced means that the gas leakage amount can be kept within the specified value even when the diameter of the valve shaft 15 is increased as shown in FIG. There is also an advantage. Conventionally, if there is a need to make the valve shaft 15 a little thicker in view of strength (particularly for receiving a load when the receiving plate 23 of the return spring 17 is fixed to the one end 15a of the valve shaft 15 by caulking), The effect is great.
【００３９】更に、本実施例では弁座部材１２のつば部
１２ｄとバルブボディ１０の間にスペーサ２４を挟んで
いるが、ステッピングモータ１８が制御上のイニシャル
位置にあって、モータ軸１９の図象下端面１９ａと、バ
ルブ装置１３が閉弁位置にあるときのバルブ軸上端面１
５ｂの間のギャップを規定の範囲内に入れるためであ
る。この方法は、スペーサ２４そのものの面積が小さく
でき、製品機種がいろいろあっても、スペーサ２４の形
状を標準化できるメリットがある。このため多機種生産
ラインの組立設備のシンプル化が図れ、組立作業も能率
的にこなすことができる。Further, in the present embodiment, the spacer 24 is interposed between the flange portion 12d of the valve seat member 12 and the valve body 10, but the stepping motor 18 is located at the control initial position, and Elephant lower end surface 19a and upper end surface 1 of valve shaft when valve device 13 is in the closed position
This is because the gap between 5b is within the specified range. This method has an advantage that the area of the spacer 24 itself can be reduced and the shape of the spacer 24 can be standardized even if there are various types of products. For this reason, the assembly equipment of the multi-model production line can be simplified, and the assembling work can be performed efficiently.
【００４０】また、本実施例の構造の制御弁１では、組
立作業がすべて上方向から行えるので、バルブボディ１
０の下面１０ｃには、組立作業用だけに必要な余計な穴
などは設ける必要がなくなり、そのため加工と組立が楽
になるばかりか、穴埋めのためのコストも削減すること
ができる。Further, in the control valve 1 having the structure of the present embodiment, since all the assembling operations can be performed from above, the valve body 1
It is not necessary to provide an extra hole or the like necessary only for the assembling work on the lower surface 10c of the "0", so that not only the processing and the assembling become easy but also the cost for filling the hole can be reduced.
【００４１】図３は、弁座部材１２とガイド部材１６の
結合状態を表している。弁座部材１２とガイド部材１６
は、単に圧入固定しただけでも良いが、更に高い気密性
が要求される場合には、弁座部材１２とガイド部材１６
の接合部付近を、全周にわたってパンチにより加圧変形
させて加締める方法が有効である。またより高い結合強
度が欲しい場合には、弁座部材１２とガイド部材１６を
圧入後に、部分加締めするとよく、ゆるみ止めや回り止
めに効果的である。FIG. 3 shows the state of connection between the valve seat member 12 and the guide member 16. Valve seat member 12 and guide member 16
May be simply press-fitted and fixed, but if higher airtightness is required, the valve seat member 12 and the guide member 16
It is effective to crimp the vicinity of the joint by pressing and deforming the entire periphery with a punch. If higher coupling strength is desired, the valve seat member 12 and the guide member 16 may be partially crimped after press-fitting, which is effective in preventing loosening and rotation.
【００４２】本発明の主要部分の他の実施例を図４に示
す。FIG. 4 shows another embodiment of the main part of the present invention.
【００４３】この実施例では、ガイド部材１６を弁座部
材１２の上口端面部１２ｆに配設し、スペーサ２４と弁
座部材１２を固定するねじ２２でこのガイド部材１６も
一緒に共締めするようにしてある。このため、ガイド部
材１６を弁座部材１２に圧入固定する工程が省けるこ
と、結合品質などに対する事前確認項目が軽減すること
などの利点が得られる。In this embodiment, the guide member 16 is disposed on the upper end face 12f of the valve seat member 12, and the guide member 16 is fastened together with the screws 24 for fixing the spacer 24 and the valve seat member 12. It is like that. Therefore, advantages such as the step of press-fitting and fixing the guide member 16 to the valve seat member 12 can be omitted, and the number of items to be checked in advance for the connection quality and the like can be reduced.
【００４４】図５は更に他の実施例示すもので、カップ
状に形成したつばなし弁座部材１２をバルブボディ１０
に圧入し、弁座部材１２の下部をスペーサ２４を介して
バルブボディ１０の第１の段部１０ｅに載置し、拡開し
た上方開口端の第２の段部１０ｆを利用してガイド部材
１６を保持固定している。FIG. 5 shows still another embodiment, in which a valve seat member 12 having a cup-like shape without a collar is connected to a valve body 10.
And the lower portion of the valve seat member 12 is placed on the first step portion 10e of the valve body 10 via the spacer 24, and the guide member is extended by using the second step portion 10f at the opened upper end. 16 is held and fixed.
【００４５】この構造は圧入後の保持力だけで、弁座部
材１２を固定したタイプの例である。もちろん、圧入後
の保持力だけでは、弁座部材１２とバルブボディ１０の
結合信頼性が問題になるような用途に使う場合は、バル
ブボディ１０の上部を加締めるようにすれば良い。This structure is an example of a type in which the valve seat member 12 is fixed only by the holding force after press-fitting. Needless to say, when the valve seat member 12 and the valve body 10 are used in an application in which the reliability of connection is problematic only by the holding force after press-fitting, the upper portion of the valve body 10 may be swaged.
【００４６】[0046]
【発明の効果】本発明によれば、弁座部材をカップ状に
形成し、それをバルブボディに固定する構造であるた
め、高温にさらされても弁座部材とバルブボディの結合
の信頼性が高い排気ガス還流制御弁が得られる。According to the present invention, since the valve seat member is formed in a cup shape and is fixed to the valve body, the reliability of the connection between the valve seat member and the valve body even when exposed to high temperatures. Thus, an exhaust gas recirculation control valve having a high value can be obtained.
【００４７】また、閉弁状態のバルブ部の気密性の良い
排気ガス還流制御弁が得られる。Further, an exhaust gas recirculation control valve having good airtightness in the valve portion in the closed state can be obtained.
【００４８】また、バルブボディと弁座部材の組付け部
からの洩れや、バルブボディとガイド部材の組付け部か
らの洩れの極めて少ない排気ガス還流制御弁が得られ
る。Further, it is possible to obtain an exhaust gas recirculation control valve in which leakage from the assembly portion between the valve body and the valve seat member and leakage from the assembly portion between the valve body and the guide member are extremely small.
【００４９】また、弁座部材の弁座とガイド部材の案内
穴の同軸が出てバルブ部のシート性が良く、またガイド
部材の案内穴とバルブ軸の間の隙間からのガス洩れを最
少限に抑えた排気ガス還流制御弁が得られる。Further, the valve seat of the valve seat member and the guide hole of the guide member are coaxial, so that the seating of the valve portion is good, and gas leakage from the gap between the guide hole of the guide member and the valve shaft is minimized. Thus, the exhaust gas recirculation control valve is suppressed to a minimum.
【００５０】また、バルブ軸を移動させるための駆動機
構の制御上のイニシャル位置と、バルブ部開閉弁の基準
位置はスペーサによって弁座部材の位置を決定できるの
で、簡単な方法で高品位に合わせることができる。Further, since the position of the valve seat member can be determined by the spacer, the initial position in the control of the drive mechanism for moving the valve shaft and the reference position of the valve opening / closing valve can be adjusted to a high quality by a simple method. be able to.
【００５１】また、一方向から組立可能で、しかも組立
作業上の制約からのバルブボディ形状の制約の少なく、
通路を最適設計可能な排気ガス還流制御弁が得られる。Further, it is possible to assemble from one direction, and there is little restriction on the shape of the valve body due to restrictions on the assembly work.
An exhaust gas recirculation control valve capable of optimally designing the passage is obtained.
【図１】本発明の一実施例の排気ガス還流制御弁を示す
断面図。FIG. 1 is a sectional view showing an exhaust gas recirculation control valve according to one embodiment of the present invention.
【図２】本発明の一実施例のリング状突起と弁座部材の
圧入状態を示す斜視断面図。FIG. 2 is a perspective sectional view showing a state where a ring-shaped projection and a valve seat member according to one embodiment of the present invention are press-fitted.
【図３】本発明の一実施例の弁座部材とガイド部材の結
合状態を示す斜視断面図。FIG. 3 is a perspective sectional view showing a connected state of a valve seat member and a guide member according to one embodiment of the present invention.
【図４】本発明の一実施例の排気ガス還流制御弁を示す
断面図。FIG. 4 is a sectional view showing an exhaust gas recirculation control valve according to one embodiment of the present invention.
【図５】本発明の一実施例の排気ガス還流制御弁のバル
ブ構成部組付近を示す断面図。FIG. 5 is a sectional view showing the vicinity of a valve component set of an exhaust gas recirculation control valve according to an embodiment of the present invention.
【図６】ガイド部材とバルブ軸との隙間関係を表したグ
ラフ。FIG. 6 is a graph showing a gap relationship between a guide member and a valve shaft.
１…排気ガス還流制御弁、１０…バルブボディ、１０ａ
…挿入穴、１０ｂ…リング状突起、１０ｃ…下面、１０
ｄ…中央座面、１１…通路穴、１２…弁座部材、１２ａ
…弁座、１２ｂ…底面、１２ｃ…側面、１２ｄ…つば
部、１２ｅ…内面、１３…バルブ装置、１４…弁体、１
５…バルブ軸、１５ｂ…上端面、１６…ガイド部材、１
６ａ…案内穴、１８…ステッピングモータ、１９…モー
タ軸、２０…第１のオリフィス、２１…第２のオリフィ
ス、２３…受け板、２４…スペーサ。1. Exhaust gas recirculation control valve, 10. Valve body, 10a
... Insertion holes, 10b. Ring-shaped protrusions, 10c.
d: central seating surface, 11: passage hole, 12: valve seat member, 12a
... valve seat, 12b ... bottom surface, 12c ... side surface, 12d ... collar, 12e ... inner surface, 13 ... valve device, 14 ... valve body, 1
5: valve shaft, 15b: upper end surface, 16: guide member, 1
6a: guide hole, 18: stepping motor, 19: motor shaft, 20: first orifice, 21: second orifice, 23: receiving plate, 24: spacer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横山 瑞穂 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器事業部内 (72)発明者 中野 泰之 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器事業部内 (72)発明者 渡邉 洋一 茨城県ひたちなか市高場2477番地 株式会 社日立カーエンジニアリング内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mizuho Yokoyama 2520 Oji Takaba, Hitachinaka-shi, Ibaraki Co., Ltd.Automotive Equipment Division, Hitachi, Ltd. (72) Inventor Yoichi Watanabe 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Car Engineering Co., Ltd.
Claims (9)
の通路穴にガス量を調節するためのバルブ装置を配置
し、該バルブ装置の弁体を駆動機構により開閉制御して
なる排気ガス還流制御弁において、 前記バルブ装置は、弁体と係合する弁座部材をカップ状
に形成すると共に、そのカップ状部材の底面側に第１の
オリフィスを形成した弁座を設け、更に上部開口端をバ
ルブ軸ガイド部材を介して前記バルブボディの通路穴内
に挟み固定したことを特徴とする排気ガス還流制御弁。An exhaust gas recirculation system comprising a valve device for adjusting a gas amount disposed in an exhaust gas recirculation passage hole formed in a valve body, and a valve mechanism of the valve device being opened and closed by a drive mechanism. In the control valve, the valve device may be configured such that a valve seat member engaged with a valve body is formed in a cup shape, a valve seat having a first orifice formed on a bottom surface side of the cup shape member, and an upper open end. The exhaust gas recirculation control valve is characterized by being sandwiched and fixed in a passage hole of the valve body via a valve shaft guide member.
の通路穴にガス量を調節するためのバルブ装置を配置
し、該バルブ装置の弁体を駆動機構により開閉制御して
なる排気ガス還流制御弁において、 前記バルブ装置は、弁体と係合する弁座部材をカップ状
に形成すると共に、そのカップ状部材の底面側に第１の
オリフィスを形成した弁座を設け、更に上部開口端につ
ば部を形成し、該つば部をバルブ軸ガイド部材を介して
前記バルブボディの中央座面に挟み固定したことを特徴
とする排気ガス還流制御弁。2. An exhaust gas recirculation system in which a valve device for adjusting a gas amount is disposed in an exhaust gas recirculation passage hole formed in a valve body, and a valve mechanism of the valve device is opened and closed by a driving mechanism. In the control valve, the valve device may be configured such that a valve seat member engaged with a valve body is formed in a cup shape, a valve seat having a first orifice formed on a bottom surface side of the cup shape member, and an upper open end. An exhaust gas recirculation control valve, wherein a collar portion is formed, and the flange portion is fixed to a central seating surface of the valve body via a valve shaft guide member.
部につば部を一体形成し、バルブボディにとりつけ固定
されていることを特徴する排気ガス還流制御弁。3. The exhaust gas recirculation control valve according to claim 1, wherein the valve seat member has a flange formed integrally with the opening end and is fixed to the valve body.
て、ガイド部材と弁座部材間にダストカバーを配置固定
したことを特徴とする排気ガス還流制御弁。4. An exhaust gas recirculation control valve according to claim 1, wherein a dust cover is disposed and fixed between the guide member and the valve seat member.
て、弁座部材はバルブボディに形成されたリング状突起
に圧入固定されていることを特徴とする排気ガス還流制
御弁。5. The exhaust gas recirculation control valve according to claim 1, wherein the valve seat member is press-fitted and fixed to a ring-shaped projection formed on the valve body.
周部に段部を形成し、該段部にバルブ軸ガイド部材を保
持したことを特徴とする排気ガス還流制御弁。6. The exhaust gas recirculation control valve according to claim 1, wherein a step portion is formed in an upper inner peripheral portion of the valve seat member, and a valve shaft guide member is held in the step portion.
ーサを介してバルブボディに固定されることを特徴とす
る排気ガス還流制御弁。7. The exhaust gas recirculation control valve according to claim 2, wherein the collar portion is fixed to the valve body via a spacer.
に段部を形成し、そこにバルブ軸ガイド部材とダストカ
バーを載置固定していることを特徴とする排気ガス還流
制御弁。8. The exhaust gas recirculation control according to claim 4, wherein the valve seat member has a step formed in the inner peripheral portion, and the valve shaft guide member and the dust cover are mounted and fixed there. valve.
端部はスペーサを介してバルブボディの段部に載置固定
されていることを特徴とする排気ガス還流制御弁。9. The exhaust gas recirculation control valve according to claim 6, wherein an outer peripheral end of the valve seat member is mounted and fixed on a step portion of the valve body via a spacer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32820596A JP3648341B2 (en) | 1996-12-09 | 1996-12-09 | Exhaust gas recirculation control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32820596A JP3648341B2 (en) | 1996-12-09 | 1996-12-09 | Exhaust gas recirculation control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10169515A true JPH10169515A (en) | 1998-06-23 |
| JP3648341B2 JP3648341B2 (en) | 2005-05-18 |
Family
ID=18207631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32820596A Expired - Fee Related JP3648341B2 (en) | 1996-12-09 | 1996-12-09 | Exhaust gas recirculation control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3648341B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138941A (en) * | 2008-12-09 | 2010-06-24 | Aisin Seiki Co Ltd | Motor mounted valve |
-
1996
- 1996-12-09 JP JP32820596A patent/JP3648341B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138941A (en) * | 2008-12-09 | 2010-06-24 | Aisin Seiki Co Ltd | Motor mounted valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3648341B2 (en) | 2005-05-18 |
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