JP2003172211A - Exhaust gas recirculation valve - Google Patents
Exhaust gas recirculation valveInfo
- Publication number
- JP2003172211A JP2003172211A JP2001372587A JP2001372587A JP2003172211A JP 2003172211 A JP2003172211 A JP 2003172211A JP 2001372587 A JP2001372587 A JP 2001372587A JP 2001372587 A JP2001372587 A JP 2001372587A JP 2003172211 A JP2003172211 A JP 2003172211A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- egr
- valve seat
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、自動車のエンジン
の排気側から分岐して吸気側の間に配設される排気ガス
再循環バルブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation valve which is branched from an exhaust side of an automobile engine and is arranged between intake sides.
【0002】[0002]
【従来の技術】ディーゼルエンジンを搭載した自動車な
どにおいては一般に、排気ガスの一部を吸気系に還流、
いわゆる排気ガス再循環(Exhaust Gas R
ecirculation、略して「EGR」という)
することで、燃焼温度を低く抑えて人体に有害なNOx
の生成を抑制している。この排気ガス再循環系部品(以
下、「EGR系部品」という)のひとつとして排気ガス
再循環バルブ(以下、「EGRバルブ」という)があ
る。図3は、EGRバルブが取り付けられたディーゼル
エンジンの模式平面図である。図3に示すように、EG
Rバルブ30は、排気マニホルド32から分岐して吸気
マニホルド33に接続するEGR導入路34に設けら
れ、エンジンの回転速度及び負荷に応じて、コントロー
ラ35で制御されている。また、EGRバルブ30前に
EGRクーラ36を設けて再循環ガスを冷却し、体積を
減少してから吸気マニホルド33に供給することによっ
て、シリンダ37内に供給する空気量を確保している。
なお、38は燃料噴射ノズル、39aは排気タービン、
39b、39cは排気ガス浄化用の触媒及びフィルタ、
39dは排気ガス、39eは過給機、39fは吸入空気
を示す。2. Description of the Related Art Generally, in a vehicle equipped with a diesel engine, a part of exhaust gas is returned to an intake system,
So-called exhaust gas recirculation (Exhaust Gas R
(ecirculation, abbreviated as "EGR")
NOx harmful to human body by keeping combustion temperature low by doing
Suppresses the generation of. An exhaust gas recirculation valve (hereinafter referred to as "EGR valve") is one of the exhaust gas recirculation system parts (hereinafter referred to as "EGR system part"). FIG. 3 is a schematic plan view of a diesel engine equipped with an EGR valve. As shown in FIG.
The R valve 30 is provided in an EGR introduction passage 34 that branches from the exhaust manifold 32 and is connected to the intake manifold 33, and is controlled by a controller 35 according to the rotation speed and the load of the engine. Further, an EGR cooler 36 is provided in front of the EGR valve 30 to cool the recirculated gas, reduce the volume thereof, and then supply the intake manifold 33 with an amount of air to be supplied into the cylinder 37.
In addition, 38 is a fuel injection nozzle, 39a is an exhaust turbine,
Reference numerals 39b and 39c are catalysts and filters for purifying exhaust gas,
39d is exhaust gas, 39e is a supercharger, and 39f is intake air.
【0003】従来のEGRバルブとしては、例えば、図
2に示す特開平7−247911号公報に記載のポペッ
ト型と呼ばれるものが一般に使用されている。図2で、
EGRバルブ20は、入口21aから出口21bまでE
GR流路21cが形成された弁箱21と、入口21aに
取り付けられた弁座22と、この弁座22に着座部23
bで離着座し弁棒23aと一体となった弁体23を有す
る。また、弁棒23aは弁箱21の嵌合孔で摺動自在に
支承され、弁箱21の上部にはコントローラ(図示せ
ず)で制御され、シリンダ25に圧縮空気が送られて作
動するアクチュエータ26を有する。そして、EGRバ
ルブ20を機能させないときには、アクチュエータ26
を作動させずに、スプリング27により弁体23で入口
21aを塞ぎ閉弁状態としている。一方、EGRバルブ
20を機能させるときには、アクチュエータ26のシリ
ンダ25に圧縮空気を送ることで、弁体23を閉弁状態
に保持するスプリング27の弾性力に抗して弁体23を
開弁し、入口21aの開度を増減(二点差線で示す)し
て、排気ガスの一部を再循環ガスとしてEGR流路21
cに導入し(矢印で示す)、吸気側に混合して再循環さ
せ、再循環ガスのもつ熱容量により燃焼温度を低下させ
てNOxを低減している。As a conventional EGR valve, for example, a so-called poppet type valve described in JP-A-7-247911 shown in FIG. 2 is generally used. In Figure 2,
The EGR valve 20 is provided with an E port from the inlet 21a to the outlet 21b.
A valve box 21 having a GR channel 21c formed therein, a valve seat 22 attached to the inlet 21a, and a seat portion 23 attached to the valve seat 22.
It has a valve body 23 which is seated on and off at b and is integrated with the valve rod 23a. The valve rod 23a is slidably supported in a fitting hole of the valve box 21, and is controlled by a controller (not shown) on the upper part of the valve box 21, and compressed air is sent to the cylinder 25 to operate. Has 26. When the EGR valve 20 is not operated, the actuator 26
The valve body 23 closes the inlet 21a by the spring 27 without operating the valve closing state. On the other hand, when operating the EGR valve 20, compressed air is sent to the cylinder 25 of the actuator 26 to open the valve body 23 against the elastic force of the spring 27 that holds the valve body 23 in the closed state. The opening degree of the inlet 21a is increased / decreased (indicated by a two-dot chain line) so that a part of the exhaust gas is used as the recirculation gas and the EGR passage 21
It is introduced into c (indicated by an arrow), is mixed with the intake side and is recirculated, and the combustion temperature is lowered by the heat capacity of the recirculated gas to reduce NOx.
【0004】一方、EGRバルブで、EGR流路の断面
積を大きくして再循環ガスをさらに多くし、酸素濃度を
減少させて燃焼温度を低下することで、NOxの生成を
いっそう抑制することも行われてきている。例えば、
「自動車技術」Vol.52,No.12,1998.
p81〜85には、ダブルポペット型EGRバルブの記
載がある。このダブルポペット型EGRバルブは、図2
に近似したポペット型EGRで、弁棒に2つの弁体を設
けると共に、弁箱には弁体がそれぞれ離着座する2つの
弁座を設け、アクチュエータで弁棒を進退させて2つの
弁体を各弁座に離着座させ、入口と出口間の2つのEG
R流路を開閉するものである。On the other hand, in the EGR valve, the cross-sectional area of the EGR passage is increased to further increase the amount of recirculated gas, the oxygen concentration is reduced, and the combustion temperature is lowered to further suppress the generation of NOx. Has been done. For example,
"Automotive technology" Vol. 52, No. 12, 1998.
Pages 81-85 describe a double poppet type EGR valve. This double poppet type EGR valve is shown in FIG.
In a poppet type EGR similar to the above, two valve bodies are provided on the valve stem, two valve seats on which the valve discs are respectively seated and detached are provided, and the actuator advances and retracts the valve stems to move the two valve discs. Two EGs are installed between the inlet and outlet, with each valve seat
The R channel is opened and closed.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、図2の
ようなポペット型のEGRバルブ20では、最大の開弁
状態でも弁体23で入口21aを覆っているのでEGR
流路21cを局部的に狭め、また弁体23が再循環ガス
の流れの抵抗となるばかりではなく、弁体23の後方で
乱流が生じて再循環ガスの脈動を発生しやすい。そし
て、再循環ガスの脈動により、弁体23と、弁座22と
でチャタリングを起こすと、コントトーラで制御して
も、EGRバルブに必要な特性が得られないことがあ
る。However, in the poppet type EGR valve 20 as shown in FIG. 2, since the valve body 23 covers the inlet 21a even in the maximum opened state, the EGR
Not only does the flow passage 21c be locally narrowed and the valve element 23 acts as a resistance against the flow of the recirculated gas, but turbulent flow occurs behind the valve element 23, and pulsation of the recirculated gas is likely to occur. If chattering occurs between the valve element 23 and the valve seat 22 due to the pulsation of the recirculated gas, the characteristics required for the EGR valve may not be obtained even if controlled by the controller.
【0006】また、図2のようなEGRバルブ20は、
前述した通り、アクチュエータ26のシリンダ25に圧
縮空気を送ることで、弁体23を閉弁状態に保持するス
プリング27の弾性力に抗して弁体23を開弁する機構
となっているが、より正確には、弁体23には再循環ガ
スの圧力が閉弁する方向に働くため、開弁するときシリ
ンダ25には、スプリング27の弾性力と再循環ガスの
圧力を加えた力に抗するだけの圧縮空気を供給してい
る。エンジンの排気ガスは、排気圧力が一定でなく、ま
た、排気流に脈動があるため、弁体23にこの不規則に
変動する圧力が作用する。特に、弁体23の着座部23
bが弁座22から離れた後、弁体23を僅かに開弁した
状態では、再循環ガスの圧力が相対的に大きく作用する
ため、開弁動作が不安定となり、弁体23が振動して、
弁体23と弁座22とが小刻みに接触する、いわゆるチ
ャタリングを起こすことがある。Further, the EGR valve 20 as shown in FIG.
As described above, by sending compressed air to the cylinder 25 of the actuator 26, the valve body 23 is opened against the elastic force of the spring 27 that holds the valve body 23 in the closed state. More precisely, since the pressure of the recirculation gas acts on the valve body 23 in the closing direction, when the valve 25 is opened, the cylinder 25 is resistant to the elastic force of the spring 27 and the force applied with the pressure of the recirculation gas. The compressed air is supplied as much as necessary. The exhaust pressure of the engine exhaust gas is not constant and the exhaust flow has a pulsation, so that this irregularly fluctuating pressure acts on the valve element 23. In particular, the seat portion 23 of the valve body 23
After b is separated from the valve seat 22, in a state where the valve body 23 is slightly opened, the pressure of the recirculated gas acts relatively large, so that the valve opening operation becomes unstable and the valve body 23 vibrates. hand,
There is a case where the valve body 23 and the valve seat 22 come into small contact with each other, so-called chattering occurs.
【0007】一方、「自動車技術」Vol.52,N
o.12,1998.p81〜85に記載されるダブル
ポペット型EGRバルブにおいても、図2のEGRバル
ブ20と同様に、2つの弁体が各2つの入口を覆ってい
るのでEGR流路を局部的に狭め、また再循環ガスの流
れの抵抗となり、弁体の後方で乱流が生じて再循環ガス
の脈動を発生しやすい。また、再循環ガスは比較的高温
であるので、2つの弁体と各2つの弁座の材質を選定し
て熱膨張係数を厳密に設定する必要がある。また、ダブ
ルポペット型EGRバルブは構造が複雑となり、製造コ
ストを上昇させる。On the other hand, "Automotive Technology" Vol. 52, N
o. 12, 1998. Also in the double poppet type EGR valve described in p81 to 85, as in the EGR valve 20 of FIG. 2, since the two valve bodies cover each two inlets, the EGR flow passage is locally narrowed, and the It becomes a resistance to the flow of the circulating gas, and a turbulent flow is generated behind the valve body, and pulsation of the recirculated gas is likely to occur. Further, since the recirculated gas has a relatively high temperature, it is necessary to strictly set the thermal expansion coefficient by selecting the materials of the two valve bodies and each of the two valve seats. In addition, the double poppet type EGR valve has a complicated structure and increases the manufacturing cost.
【0008】本発明は、上記課題に鑑みなされたもの
で、EGR流路の断面積を大きくでき、弁体が再循環ガ
スの流れの抵抗とならず、弁体の後方に乱流を生じるこ
とを少なくすると共に、弁体を僅かに開弁した状態で、
弁体と弁座とでチャタリングを起こすことが少ないEG
Rバルブを得ることにある。The present invention has been made in view of the above problems, and the cross-sectional area of the EGR passage can be increased, the valve body does not act as a resistance against the flow of the recirculated gas, and a turbulent flow occurs behind the valve body. With the number of valves reduced and the valve body opened slightly,
EG that rarely causes chattering between the valve body and valve seat
To get the R valve.
【0009】[0009]
【課題を解決するための手段】本発明のEGRバルブ
は、内面に少なくとも1つの弁座が形成された弁箱と、
該弁箱内で回動して前記弁座に摺接し得る曲面をもつ弁
体と、を有することを特徴とする。ここで、回動とは軸
を中心として回転して動作すること、摺接とは当接また
はごく僅かの間隙をもって対向すること、曲面とは球面
または円錐面の一部を切り欠いた面体を言う。そして、
弁座は、弁箱の内面で、排気ガスの一部が再循環ガスと
して通過するEGR流路上に少なくとも1つ形成すれば
よく、弁座の形成位置は弁箱の中央部、入口部及び出口
部の他、何れの部位でもよい。また、弁座は、弁箱と一
体に形成してもよいし、別体で取り付けてもよい。An EGR valve according to the present invention comprises a valve box having an inner surface formed with at least one valve seat.
A valve body having a curved surface that can rotate in the valve box and come into sliding contact with the valve seat. Here, the term "rotation" means to rotate and operate about an axis, the term "sliding contact" means to abut or face each other with a very small gap, and the term "curved surface" means a surface body obtained by cutting a part of a spherical surface or a conical surface. To tell. And
At least one valve seat may be formed on the inner surface of the valve box on the EGR passage through which a part of the exhaust gas passes as recirculation gas. The valve seats are formed at the central portion, the inlet portion, and the outlet portion of the valve box. It may be any part other than the part. The valve seat may be formed integrally with the valve box or may be attached separately.
【0010】上記の構成によれば、弁体を回動すること
でEGR流路の開閉が可能であり、再循環ガスの制御弁
としての機能を発揮する。そして、弁体の曲面と、弁箱
の弁座とが当接する閉弁状態では、入口から出口に再循
環ガスは流れない。一方、弁体を回動した開弁状態で
は、弁体は弁箱内のEGR流路の外方に置かれるので、
従来のポペット型EGRバルブのように、流路に再循環
ガスの流れを妨げる遮蔽物が存在しないので、EGRバ
ルブ内面の流路の断面積を大きくでき、弁体が再循環ガ
スの流れの抵抗とならず、弁体の後方に乱流を生じるこ
とを少なくできる。さらに、従来のポペット型EGRバ
ルブのように、圧縮空気により作動するアクチュエータ
とスプリングにより弁体の開度を規制するのではなく、
軸(以下、「回動軸」という)を中心として回転動作す
る弁体により開度を規制するので、弁体を僅かに弁座か
ら離した開弁状態でも、弁体と弁座とでチャタリングを
起こすことは少ない。According to the above structure, the EGR passage can be opened and closed by rotating the valve body, and the function as a control valve for the recirculation gas is exhibited. Then, in the closed state where the curved surface of the valve body and the valve seat of the valve box are in contact, the recirculation gas does not flow from the inlet to the outlet. On the other hand, in the valve open state where the valve body is rotated, the valve body is placed outside the EGR flow path in the valve box.
Unlike the conventional poppet type EGR valve, since there is no shield in the flow passage that obstructs the flow of the recirculation gas, the cross-sectional area of the flow passage on the inner surface of the EGR valve can be increased and the valve body can resist the flow of the recirculation gas. Therefore, it is possible to reduce the occurrence of turbulent flow behind the valve body. Further, unlike the conventional poppet type EGR valve, the opening degree of the valve body is not regulated by an actuator and a spring operated by compressed air,
The opening degree is regulated by a valve element that rotates around an axis (hereinafter referred to as "rotating axis"), so chattering occurs between the valve element and the valve element even when the valve element is slightly separated from the valve element. Is rarely caused.
【0011】本発明のEGRバルブにおいては、前記弁
体に流路が形成することが好ましい。弁体に流路を形成
すれば、開弁状態では、さらに、EGRバルブ内面の流
路の断面積を大きくでき、弁体が再循環ガスの流れの抵
抗とならず、弁体の後方に乱流を生じることを少なくで
きる。In the EGR valve of the present invention, it is preferable that a flow passage is formed in the valve body. If a flow passage is formed in the valve body, the cross-sectional area of the flow passage on the inner surface of the EGR valve can be further increased in the valve open state, the valve body does not become a resistance to the flow of the recirculation gas, and the rear side of the valve body is disturbed. The flow can be reduced.
【0012】本発明のEGRバルブにおいては、前記弁
体の回動軸は、前記弁座の軸線から偏心していることが
好ましい。弁体の回動軸を弁座の軸線から偏心させるこ
とで、閉弁の状態では摺接しているが、開弁の状態に入
ると、弁体と弁箱とが干渉しない。In the EGR valve of the present invention, it is preferable that the rotating shaft of the valve body is eccentric from the axis of the valve seat. By making the rotation axis of the valve element eccentric from the axis of the valve seat, the valve element slides in contact with the valve in the closed state, but when the valve enters the open state, the valve element and the valve box do not interfere with each other.
【0013】[0013]
【発明の実施の形態】次に、発明の実施の形態を詳細に
説明する。図1は、実施の形態のEGRバルブであり、
(a)主要部の模式組立図、(b)は閉弁時の弁箱と弁
体の断面図、(c)は開弁時の弁箱と弁体の断面図を示
す。BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail. FIG. 1 shows an EGR valve of an embodiment,
(A) A schematic assembly view of a main part, (b) is a sectional view of a valve box and a valve body when the valve is closed, and (c) is a sectional view of the valve box and the valve body when the valve is open.
【0014】図1(a)〜(c)で、EGRバルブ10
は、入口11aから出口11bまでEGR流路11cが
形成され、また出口11b付近の内面に弁座12が形成
された弁箱11と、この弁箱11内で90度回動(図1
(c)での矢印)し、弁座12に摺接し得る曲面13a
をもつ弁体13とを有する。弁体13は、外形円形をな
し、閉弁の状態で弁座12に摺接し得る周縁部には、球
面または円錐面の一部を切り欠いた面体形状の曲面13
aを有し、弁座12と摺接しない部位は平坦部13bと
している。また、弁体13は、閉弁の状態で弁座12と
向きあう反対の側に、その上下部から弁座12の軸線1
7と平行に回動軸18へ向かって突設された上部腕13
cと下部腕13dを一体に備えている。上部腕13c
は、回動軸18と同軸上に弁箱11に装着した被駆動軸
18aの下端部に嵌合固着させ、下部腕13dは、回動
軸18と同軸上に弁箱11に装着した支軸18bに係合
して、弁箱11内で弁体13を回転自在に支持して装着
している。そして、弁体13は、ステッピングモータ1
5を回転制御し、駆動軸15a、リンク16a〜16c
を介して、弁体13と嵌合固着して一体に設けた被駆動
軸18aで、閉弁から開弁間を、回動軸18を中心とし
て回動される。なお、19a、19bは弁箱11のブラ
ケットである。また、本実施の形態のEGRバルブ10
は、弁体13の回動軸18を弁座12の軸線17から偏
心Lさせている。ステッピングモータ15は、説明の都
合上、弁箱11の入口11aの右側に描いているが、実
際は弁箱11の背面に配置している。本実施の形態で
は、弁座12と弁箱11が一体となった構成を示した
が、弁座12を弁箱11と別体に構成してもよい。1A to 1C, the EGR valve 10 is shown.
Is a valve box 11 in which an EGR flow passage 11c is formed from the inlet 11a to the outlet 11b, and a valve seat 12 is formed on the inner surface near the outlet 11b, and the valve box 11 rotates 90 degrees in the valve box 11 (see FIG.
(Arrow in (c)) and curved surface 13a that can slide on the valve seat 12
And a valve body 13 having. The valve body 13 has a circular outer shape, and a peripheral surface of the valve body 13 that can be slidably contacted with the valve seat 12 in a closed state has a spherical or conical surface-shaped curved surface 13 cut out.
A portion having a and not slidingly contacting the valve seat 12 is a flat portion 13b. Further, the valve body 13 is located on the opposite side of the valve body 12 facing the valve seat 12 in the closed state, and the axis 1 of the valve seat 12 extends from the upper and lower portions thereof.
The upper arm 13 which is projected in parallel to the rotation shaft 18 toward the rotation axis 7.
c and the lower arm 13d are integrally provided. Upper arm 13c
Is fitted and fixed to the lower end of a driven shaft 18a mounted on the valve box 11 coaxially with the rotary shaft 18, and the lower arm 13d is a support shaft mounted on the valve box 11 coaxially with the rotary shaft 18. The valve body 13 is rotatably supported and mounted in the valve box 11 by engaging with 18b. The valve body 13 is the stepping motor 1
5 rotation control, drive shaft 15a, links 16a-16c
The driven shaft 18a that is fitted and fixed to the valve body 13 via the shaft is rotated about the rotation shaft 18 from the closed state to the opened state. In addition, 19a and 19b are brackets of the valve box 11. In addition, the EGR valve 10 of the present embodiment
Makes the turning shaft 18 of the valve body 13 eccentric L from the axis 17 of the valve seat 12. Although the stepping motor 15 is drawn on the right side of the inlet 11a of the valve box 11 for convenience of description, it is actually placed on the back surface of the valve box 11. In the present embodiment, the configuration in which the valve seat 12 and the valve box 11 are integrated has been described, but the valve seat 12 may be configured separately from the valve box 11.
【0015】閉弁の状態で、入口11aから出口11b
への再循環ガスの洩れ止めをより確実にしたい場合、弁
体13と弁座12とが当接したときの密着性を向上する
ためのシール手段を講じるようにしてもよい。シール手
段としては、弁座12または弁体13の少なくとも一方
の、両者が摺接する部位の全体または一部をゴム製、樹
脂製、金属製などの弾性変形する部材で構成するか、こ
れらの部材からなるシールリングを弁座12および/ま
たは弁体13に装着することで、これらの部材の弾性力
によって弁体13と弁座12の密着性を向上することが
できる。また、別のシール手段としては、弁座12の背
面にゴムやバネからなる弾性力を発現する部材を装着
し、弁座12と弁体13が摺接したとき、これらの部材
の弾性力によって弁座12を弁体13に向けて押圧する
ことで、両者の密着性を向上することもできる。With the valve closed, the inlet 11a to the outlet 11b
When it is desired to more reliably prevent the recirculation gas from leaking to the valve, a sealing means may be provided to improve the adhesion when the valve body 13 and the valve seat 12 come into contact with each other. As the sealing means, at least one of the valve seat 12 and the valve body 13 is made of an elastically deformable member such as rubber, resin, metal, or the like, which is a part or part of a portion in which both are in sliding contact with each other. By mounting the seal ring consisting of the above on the valve seat 12 and / or the valve body 13, the adhesion between the valve body 13 and the valve seat 12 can be improved by the elastic force of these members. Further, as another sealing means, a member which is made of rubber or spring and exerts an elastic force is attached to the back surface of the valve seat 12, and when the valve seat 12 and the valve body 13 are in sliding contact with each other, the elastic force of these members causes By pressing the valve seat 12 toward the valve body 13, the adhesion between the two can be improved.
【0016】次に、EGRバルブ10の動作を図1
(b)(c)に基づき説明する。先ず、図1(b)の閉
弁の状態では、弁体13の曲面13aと弁座12とが当
接することで、入口11aから出口11bに再循環ガス
は流れない。また、本発明のEGRバルブ10は、従来
のポペット型のEGRバルブのように、アクチュエータ
による開弁方向の力と、スプリングの弾性力による閉弁
方向の力とのバランスをとりながら弁体の開度を規制す
るのではなく、ステッピングモータ15を駆動源とし、
これを回転制御し、駆動軸15a、リンク16a〜16
c、被駆動軸18aを介して、回動軸18を中心とし
て、弁箱11内で回転動作する弁体13により開度を規
制している。従って、弁体13を僅かに回動させて、曲
面13aの端部13a−1と弁座12とで僅かにEGR
流路11cを形成しても再循環ガスの圧力の影響を受け
難く、弁体13と弁座12との接触によるチャタリング
の発生を抑えることができる。なお、13a−2は曲面
13aの一方の端部である。Next, the operation of the EGR valve 10 will be described with reference to FIG.
A description will be given based on (b) and (c). First, in the closed state of FIG. 1B, since the curved surface 13a of the valve body 13 and the valve seat 12 contact each other, the recirculation gas does not flow from the inlet 11a to the outlet 11b. Further, the EGR valve 10 of the present invention, like the conventional poppet type EGR valve, opens the valve body while balancing the force in the valve opening direction by the actuator and the force in the valve closing direction by the elastic force of the spring. Instead of regulating the degree, use the stepping motor 15 as a drive source,
This is rotationally controlled to drive shaft 15a and links 16a-16
The opening degree is regulated by the valve body 13 that rotates in the valve box 11 about the rotating shaft 18 via the driven shaft 18a. Therefore, the valve body 13 is slightly rotated so that the end portion 13a-1 of the curved surface 13a and the valve seat 12 slightly move the EGR.
Even if the flow passage 11c is formed, it is unlikely to be affected by the pressure of the recirculated gas, and the occurrence of chattering due to the contact between the valve body 13 and the valve seat 12 can be suppressed. Note that 13a-2 is one end of the curved surface 13a.
【0017】そして、弁体13を図1(b)の閉弁の状
態から、図1(c)の開弁の状態まで、回動して開弁し
たとき、弁体13は弁箱11内のEGR流路11cの外
方に置かれるので、従来のポペット型EGRバルブのよ
うに、EGR流路11cに再循環ガスの流れを妨げる遮
蔽物が存在しないので、EGRバルブ内面の流路の断面
積を大きくでき、また、弁体が再循環ガスの流れの抵抗
とならず、また、弁体の後方に乱流を生じることを少な
くできる。When the valve body 13 is rotated and opened from the closed state of FIG. 1 (b) to the opened state of FIG. 1 (c), the valve body 13 is inside the valve box 11. Since it is placed outside the EGR flow passage 11c, there is no shield that blocks the flow of the recirculated gas in the EGR flow passage 11c, unlike the conventional poppet type EGR valve. The area can be increased, the valve body does not become a resistance to the flow of the recirculation gas, and the turbulent flow behind the valve body can be reduced.
【0018】さらに、図1(a)に示すように、弁体1
3を上部腕13cと下部腕13dとで両持ちの構造と
し、弁体13に流路が形成されている。このため、開弁
状態では弁体13がEGR流路11cを遮らないので、
前述の弁体13がEGR流路11cの外方に置かれる効
果に加えて、入口11aから出口11bまでEGR流路
11cの断面積を大きくでき、弁体13が再循環ガスの
流れの抵抗とならず、弁体13の後方に乱流を生じるこ
とを少なくできる。なお、図1(a)からも明らかな通
り、弁体13のみならず、回動軸18もEGR流路11
cを横切らない構造としているのでさらに流路が確保さ
れ効果的である。本実施の形態では、説明の都合上、弁
体13と回動軸18とを区別して説明したが、弁箱内の
再循環ガスの流路上に配置される部材のうち、回動軸や
弁棒などは、機能的には弁体の一部を構成する部品であ
ることから、これらの構成部品も弁体と定義する。この
ように、弁体に流路が形成されたことで、EGR流路1
1cの途中にじゃま物がないため、弁箱11内の再循環
ガスの流れがスムーズとなる。Further, as shown in FIG. 1 (a), the valve body 1
3, the upper arm 13c and the lower arm 13d have a double-supported structure, and a flow path is formed in the valve body 13. Therefore, since the valve body 13 does not block the EGR passage 11c in the valve open state,
In addition to the effect that the valve element 13 is placed outside the EGR channel 11c, the cross-sectional area of the EGR channel 11c can be increased from the inlet 11a to the outlet 11b, and the valve element 13 can reduce the flow resistance of the recirculation gas. Therefore, it is possible to reduce the occurrence of turbulent flow behind the valve body 13. As is clear from FIG. 1A, not only the valve body 13 but also the rotating shaft 18 is provided in the EGR passage 11
Since the structure is such that it does not cross c, it is effective because a further flow path is secured. In the present embodiment, for convenience of description, the valve body 13 and the rotary shaft 18 are described separately, but among the members arranged on the flow path of the recirculated gas in the valve box, the rotary shaft and the valve are not shown. Since a rod or the like is a component that functionally constitutes a part of the valve body, these components are also defined as a valve body. Since the flow path is formed in the valve body in this way, the EGR flow path 1
Since there is no obstacle in the middle of 1c, the flow of the recirculated gas in the valve box 11 becomes smooth.
【0019】さらに、弁体13の回動軸18を弁座12
の軸線17から偏心Lさせているので、弁体13を
(b)の閉弁の状態から(c)の開弁の状態まで回動す
るとき、弁体13と弁箱11とが干渉しない。また、閉
弁するときは、弁体13は全閉位置に至るまで弁座12
と干渉せず、全閉位置近くに至って初めて弁体13の曲
面13aと弁座12が摺接する。再循環ガスの入口11
aから出口11bへの洩れを生じないよう、より密着性
を向上するなら、さらに弁体13を閉弁方向に回転させ
ることで、両者が当接して押し付けが強くなりより確実
に閉鎖できる。Further, the rotary shaft 18 of the valve body 13 is attached to the valve seat 12
Since the eccentricity L is deviated from the axis line 17 of the above, when the valve body 13 is rotated from the closed state of (b) to the opened state of (c), the valve body 13 and the valve box 11 do not interfere with each other. Further, when closing the valve, the valve body 13 moves to the valve seat 12 until it reaches the fully closed position.
The curved surface 13a of the valve body 13 and the valve seat 12 come into sliding contact only near the fully closed position without interfering with. Recirculation gas inlet 11
If the adhesion is further improved so as to prevent leakage from a to the outlet 11b, by further rotating the valve body 13 in the valve closing direction, the two abut against each other and the pressing force becomes stronger, so that the valve body 13 can be closed more reliably.
【0020】本発明は上記した実施の形態に限定される
ものではなく、例えば、再循環ガスの制御弁としては、
中央に貫通孔を有する球状弁体を弁箱内に収容したボー
ル弁(回転式開閉弁)等を用いてもよい。また、弁体を
回転制御する駆動手段としてステッピングモータを例に
挙げたが、サーボモータ、油圧モータ、エアモータ、電
動シリンダ等でもよい。The present invention is not limited to the above-mentioned embodiment, and for example, as a recirculation gas control valve,
A ball valve (rotary on-off valve) or the like in which a spherical valve element having a through hole in the center is housed in a valve box may be used. Further, the stepping motor has been taken as an example of the drive means for controlling the rotation of the valve element, but a servo motor, a hydraulic motor, an air motor, an electric cylinder or the like may be used.
【0021】[0021]
【実施例】図1で、弁箱11をステンレス鋳鋼により、
入口11aの内径を50mm、出口11bの内径を50
mm、全幅を120mmとして鋳造した。そして、出口
11b側の弁座12ほかを機械加工で形成した。一方、
弁体13もステンレス鋳鋼により、曲面13aに仕上代
を付して鋳造し、曲面13aほかを機械加工で形成し
た。このとき、曲面13aの球径を70mm、回動軸1
8と弁座12の軸線17との偏心Lを3mmとした。そ
して、全部品を組み立ててEGRバルブ10とし、さら
に再循環ガスの流れを模した試験装置で試験を行った。
その結果、弁体13を僅かに開弁した状態で、弁体13
と弁座12とでチャタリングを起こすことがなかった。EXAMPLE In FIG. 1, the valve box 11 is made of cast stainless steel.
The inner diameter of the inlet 11a is 50 mm and the inner diameter of the outlet 11b is 50 mm.
mm, and the total width was 120 mm. Then, the valve seat 12 and the like on the outlet 11b side were formed by machining. on the other hand,
The valve body 13 was also cast from stainless cast steel with a finishing allowance on the curved surface 13a, and the curved surface 13a and others were machined. At this time, the spherical diameter of the curved surface 13a is 70 mm, and the rotating shaft 1
8 and the eccentricity L of the axis line 17 of the valve seat 12 were set to 3 mm. Then, all the components were assembled into the EGR valve 10, and the test was conducted with a test device simulating the flow of the recirculation gas.
As a result, with the valve body 13 slightly opened, the valve body 13
And the valve seat 12 did not cause chattering.
【0022】[0022]
【発明の効果】以上、詳細に説明のとおり、本発明のE
GRバルブは、EGR流路の断面積を大きくでき、弁体
が再循環ガスの流れの抵抗とならず、弁体の後方に乱流
を生じることを少なくすると共に、弁体を僅かに開弁し
た状態で、弁体と弁座とでチャタリングを起こすことが
少ないEGRバルブが得られる。As described above in detail, the E of the present invention
The GR valve can increase the cross-sectional area of the EGR flow passage, the valve body does not become a resistance to the flow of the recirculation gas, reduces turbulence behind the valve body, and slightly opens the valve body. In this state, it is possible to obtain an EGR valve in which chattering between the valve body and the valve seat is less likely to occur.
【図1】実施の形態のEGRバルブであり、(a)は主
要部の模式組立図、(b)は閉弁時の弁箱と弁体の断面
図、(c)は開弁時の弁箱と弁体の断面図を示す。1 is an EGR valve of an embodiment, (a) is a schematic assembly view of a main part, (b) is a sectional view of a valve box and a valve body when the valve is closed, and (c) is a valve when the valve is open. A sectional view of a box and a valve body is shown.
【図2】従来の、特開平7−247911号公報に記載
のEGRバルブである。FIG. 2 is a conventional EGR valve described in Japanese Patent Laid-Open No. 7-247911.
【図3】EGRバルブが取り付けられたディーゼルエン
ジンの模式平面図である。FIG. 3 is a schematic plan view of a diesel engine equipped with an EGR valve.
10、20、30:EGR(排気ガス再循環)バルブ 11、21:弁箱 11a、21a:入口 11b、21b:出口 11c、21c:EGR流路 12、22:弁座 13、23:弁体 13a:曲面 13a−1、13a−2:曲面の端部 13b:平坦部 13c:上部腕 13d:下部腕 15:ステッピングモータ 15a:駆動軸 16a〜16c:リンク 17:軸線 18:回動軸 18a:被駆動軸 18b:支軸 19a、19b:ブラケット 23a:弁棒 23b:着座部 25:シリンダ 26:アクチュエータ 27:スプリング 32:排気マニホルド 33:吸気マニホルド 34:EGR導入路 35:コントローラ 36:EGRクーラ 37:シリンダ 38:燃料噴射ノズル 39a:排気タービン 39b、39c:排気ガス浄化用フィルタ及びフィルタ 39d:排気ガス 39e:過給機 39f:吸入空気 10, 20, 30: EGR (exhaust gas recirculation) valve 11, 21: valve box 11a, 21a: entrance 11b, 21b: Exit 11c, 21c: EGR flow path 12, 22: valve seat 13, 23: Disc 13a: curved surface 13a-1 and 13a-2: end portions of curved surface 13b: flat part 13c: upper arm 13d: lower arm 15: Stepping motor 15a: drive shaft 16a-16c: Links 17: axis 18: rotation axis 18a: driven shaft 18b: support shaft 19a, 19b: bracket 23a: valve rod 23b: seating portion 25: Cylinder 26: Actuator 27: Spring 32: Exhaust manifold 33: Intake manifold 34: EGR introduction route 35: Controller 36: EGR cooler 37: Cylinder 38: Fuel injection nozzle 39a: Exhaust turbine 39b, 39c: Exhaust gas purifying filter and filter 39d: Exhaust gas 39e: Supercharger 39f: Intake air
フロントページの続き (72)発明者 秋山 三郎 三重県三重郡朝日町小向200番地 日立バ ルブ株式会社内 Fターム(参考) 3G062 AA01 AA05 EA11 EC01 EC15 EC16 Continued front page (72) Inventor Saburo Akiyama 200, Komukai, Asahi-cho, Mie-gun, Mie Prefecture Within LUB Co., Ltd. F term (reference) 3G062 AA01 AA05 EA11 EC01 EC15 EC16
Claims (3)
た弁箱と、該弁箱内で回動して前記弁座に摺接し得る曲
面をもつ弁体と、を有することを特徴とする排気ガス再
循環バルブ。1. A valve box having at least one valve seat formed on an inner surface thereof, and a valve body having a curved surface capable of rotating in the valve box and slidingly contacting the valve seat. Exhaust gas recirculation valve.
とする請求項1に記載の排気ガス再循環バルブ。2. The exhaust gas recirculation valve according to claim 1, wherein a flow passage is formed in the valve body.
ら偏心していることを特徴とする請求項1〜2に記載の
排気ガス再循環バルブ。3. The exhaust gas recirculation valve according to claim 1, wherein the rotary shaft of the valve element is eccentric from the axis of the valve seat.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001372587A JP2003172211A (en) | 2001-12-06 | 2001-12-06 | Exhaust gas recirculation valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001372587A JP2003172211A (en) | 2001-12-06 | 2001-12-06 | Exhaust gas recirculation valve |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003172211A true JP2003172211A (en) | 2003-06-20 |
Family
ID=19181452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001372587A Pending JP2003172211A (en) | 2001-12-06 | 2001-12-06 | Exhaust gas recirculation valve |
Country Status (1)
Country | Link |
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JP (1) | JP2003172211A (en) |
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