JP3474450B2 - EGR valve device - Google Patents
EGR valve deviceInfo
- Publication number
- JP3474450B2 JP3474450B2 JP24788498A JP24788498A JP3474450B2 JP 3474450 B2 JP3474450 B2 JP 3474450B2 JP 24788498 A JP24788498 A JP 24788498A JP 24788498 A JP24788498 A JP 24788498A JP 3474450 B2 JP3474450 B2 JP 3474450B2
- Authority
- JP
- Japan
- Prior art keywords
- egr
- valve seat
- upstream
- passage
- valve
- 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.)
- Expired - Lifetime
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
- Lift Valve (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Valve Housings (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明はディーゼルエンジン
のＥＧＲ装置などに用いられるＥＧＲバルブ装置に係
り、特に、ＥＧＲガスの流れ損失を低減するに有効なＥ
ＧＲバルブ装置に関するものである。
【０００２】
【従来の技術】従来のＥＧＲバルブ装置としては、例え
ば図２に示したように、図示しない排気通路から分岐す
るＥＧＲ通路１の終端部にエルボ２などを設けて上流側
湾曲部３を構成し、この上流側湾曲部３の湾曲終端４よ
りも下流位置に弁座５を位置させている。また、前記弁
座５よりも下流の位置を湾曲始端６として上流側湾曲部
３と逆の方向に向って湾曲する下流側湾曲部７を吸気通
路８の上流端部に設けることにより、ＥＧＲ通路１を流
れてきたＥＧＲガスを弁座５に直角方向から流入させる
ようにしたものがある。９はＥＧＲ通路１側から弁座５
に着座させたバルブ９である。
【０００３】このように、バルブ９を吸気通路８側に保
持させた場合は、バルブ９の熱負荷を軽減することがで
きるにも拘らず、ＥＧＲガスの流れ損失が大きくなるた
めに、大量ＥＧＲを行なわせようとするとＥＧＲ通路お
よびＥＧＲバルブ装置を大型化する必要性があった。
【０００４】すなわち、従来のように弁座５を上流側湾
曲部３の湾曲終端４より下流に配設して弁座５に対して
直角方向からＥＧＲガスを流入させるようにした場合
は、ＥＧＲ通路１から流入したＥＧＲガスが上流側湾曲
部３の外側に偏流して弁座５に流入するために、下流側
湾曲部７においては湾曲内側のコーナ部分に剥離が発生
する。このような剥離はＥＧＲガスの流量が増加するに
つれて強くなって流れ損失が増大するために、大量ＥＧ
Ｒを行なわせようとする場合は製造コストおよび搭載性
を犠牲にしてＥＧＲ通路および弁座などを大型化する必
要があった。
【０００５】
【発明が解決しようとする課題】本発明は上記実情に鑑
みてなされたものであって、ＥＧＲ通路および弁座など
を大型化することなくＥＧＲガスの流れ損失を低減する
ことができるＥＧＲバルブ装置を提供することを課題と
している。
【０００６】
【課題を解決するための手段】上記課題を解決するため
に本発明は、排気通路から分岐するＥＧＲ通路の終端部
と吸気通路の接続部に弁座を設け、該弁座にＥＧＲ通路
側から着座させたバルブを吸気通路側に保持させたＥＧ
Ｒバルブ装置において、前記ＥＧＲ通路の終端部分を構
成する上流側湾曲部の湾曲終端を少なくとも弁座の上流
側端面より下流側に位置させるとともに、該弁座の近傍
を湾曲始端として上流側湾曲部と逆の方向に向って湾曲
する下流側湾曲部を吸気通路の上流端部に設けたことを
特徴としている。
【０００７】
【発明の実施の形態】以下に本発明の実施形態を図に基
づいて詳細に説明する。図１は本発明に係るＥＧＲバル
ブ装置の一実施形態を示す断面図である。なお、図２に
示した従来例と同一機能を有する部分には同一の符号を
付してその詳細な説明を省略する。
【０００８】本実施形態においては図示しない排気通路
から分岐させたＥＧＲ通路１の終端部にエルボ２などに
よる上流側湾曲部３を形成し、この上流側湾曲部３の湾
曲終端４を弁座５の上流側端面に一致させている。ま
た、前記弁座５にＥＧＲ通路１側からバルブ９を着座さ
せる一方、弁座５の形成位置を湾曲始端６として上流側
湾曲部３と逆の方向に向って湾曲する下流側湾曲部７を
吸気通路８の上流端部に設けることにより、ＥＧＲ通路
１を流れてきたＥＧＲガスをバルブ９で流量制御して吸
気通路８に流入させるようにしている。なお、バルブ９
は図示しないアクチュエータにより図中左右方向に移動
制御される。
【０００９】すなわち、従来では上流側湾曲部３の湾曲
終端４よりも下流に弁座５を設けるとともに、弁座５よ
りも下流の位置を湾曲始端６とする下流側湾曲部７を設
けることにより、ＥＧＲガスを弁座５に対して直角方向
から流入させるように設定していたために、上流側湾曲
部３においては湾曲外側に多量のＥＧＲガスが流れて下
流側湾曲部７の湾曲内側のコーナ部分に剥離が発生して
いた。
【００１０】しかしながら、本実施形態のように上流側
湾曲部３の湾曲終端４を弁座５の上流側端面に一致させ
るとともに、この弁座５の近傍を下流側湾曲部７の湾曲
始端６とした場合は、ＥＧＲ通路１を流れてきたＥＧＲ
ガスが上流側湾曲部３による方向変換作用を受けつつ直
ちに弁座５に流入するために、ＥＧＲガスは全体として
弁座５に斜め方向から流入して斜め方向に流出する。
【００１１】従って、下流側湾曲部７においては湾曲外
側の流れが多くなり、湾曲内側の流れが相対的に減少し
て湾曲内側コーナ部の剥離が少なくなるために、流れ損
失が減少する。このために、ＥＧＲ通路１および弁座５
などを大型化することなく大量のＥＧＲガスを供給する
ことができ、目標ＥＧＲ率の確保が可能となる。
【００１２】また、弁座５の近傍を湾曲始端６として上
流側湾曲部３と逆の方向に向って湾曲する下流側湾曲部
７を吸気通路８の上流端部に設けた構成としているため
に、例えばヒートインシュレータなどを用いることなく
ＥＧＲバルブ装置の熱負荷を軽減することができる。
【００１３】なお、上記実施形態においては上流側湾曲
部３の湾曲終端４を弁座５の上流側端面に一致させる一
方、下流側湾曲部の湾曲始端６を弁座５のほぼ中央部分
に位置させているが、両者を一致させ、あるいは、上流
側湾曲部３の通路面積を犠牲にしない範囲内で上流側湾
曲部３の湾曲終端を弁座５の下流側に位置させた場合
は、ＥＧＲガスの流れ込み角度を小さくすることができ
るために、ＥＧＲバルブを設けることによる損失をより
減少することができる利点がある。
【００１４】
【発明の効果】以上の説明から明らかなように本発明
は、ＥＧＲ通路の終端部分を構成する上流側湾曲部の湾
曲終端を少なくとも弁座の上流側端面より下流側に位置
させるとともに、該弁座の近傍を湾曲始端として上流側
湾曲部と逆の方向に向って湾曲する下流側湾曲部を吸気
通路の上流端部に設けたものであるから、ＥＧＲバルブ
装置の熱負荷を軽減しつつ、ＥＧＲガスを弁座に斜め方
向から流出入させることができるために、ＥＧＲバルブ
装置による流れ損失を小さくすることができる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an EGR valve device used for an EGR device or the like of a diesel engine, and more particularly to an EGR valve effective for reducing a flow loss of EGR gas.
The present invention relates to a GR valve device. 2. Description of the Related Art As a conventional EGR valve device, as shown in FIG. 2, for example, an elbow 2 or the like is provided at an end portion of an EGR passage 1 branched from an exhaust passage (not shown) so that an upstream curved portion 3 is provided. The valve seat 5 is located at a position downstream of the bending end 4 of the upstream bending portion 3. The EGR passage is provided by providing a downstream curved portion 7 that is curved in a direction opposite to the upstream curved portion 3 at the upstream end of the intake passage 8 with the position downstream of the valve seat 5 as a curved start end 6. There is a type in which the EGR gas flowing through 1 flows into the valve seat 5 from a right angle direction. 9 is a valve seat 5 from the EGR passage 1 side.
The valve 9 is seated on the vehicle. [0003] When the valve 9 is held on the side of the intake passage 8 as described above, the flow loss of the EGR gas increases, although the thermal load on the valve 9 can be reduced. In order to perform the above, it is necessary to enlarge the EGR passage and the EGR valve device. That is, when the valve seat 5 is disposed downstream of the curved end 4 of the upstream curved portion 3 so that the EGR gas flows from the valve seat 5 in a direction perpendicular to the valve seat 5 as in the prior art, Since the EGR gas flowing from the passage 1 is deflected to the outside of the upstream curved portion 3 and flows into the valve seat 5, in the downstream curved portion 7, separation occurs at a corner inside the curved portion. Such separation increases as the flow rate of the EGR gas increases, and the flow loss increases.
In the case of performing R, it is necessary to increase the size of the EGR passage and the valve seat at the expense of manufacturing cost and mountability. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can reduce the flow loss of EGR gas without increasing the size of an EGR passage, a valve seat, and the like. It is an object to provide an EGR valve device. SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a valve seat at a connection between an end of an EGR passage branched from an exhaust passage and an intake passage, and the valve seat has an EGR. EG holding a valve seated from the passage side on the intake passage side
In the R-valve device, the curved end of the upstream curved portion constituting the end portion of the EGR passage is at least upstream of the valve seat.
It is located downstream from the side end surface, and a downstream curved portion that curves in the opposite direction to the upstream curved portion with the vicinity of the valve seat as a curved starting end is provided at the upstream end of the intake passage. I have. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the EGR valve device according to the present invention. Parts having the same functions as those of the conventional example shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, an upstream curved portion 3 such as an elbow 2 is formed at the end of an EGR passage 1 branched from an exhaust passage (not shown), and a curved end 4 of the upstream curved portion 3 is connected to a valve seat 5. To the upstream end face. Also, while the valve 9 is seated on the valve seat 5 from the EGR passage 1 side, the downstream bending portion 7 which is bent in the direction opposite to the upstream bending portion 3 with the formation position of the valve seat 5 as the bending start end 6 is provided. By providing the EGR gas at the upstream end of the intake passage 8, the flow rate of the EGR gas flowing through the EGR passage 1 is controlled by the valve 9 so as to flow into the intake passage 8. The valve 9
Is controlled to move in the horizontal direction in the figure by an actuator (not shown). That is, conventionally, by providing the valve seat 5 downstream of the bending end 4 of the upstream bending portion 3 and providing the downstream bending portion 7 whose bending downstream end is located at a position downstream of the valve seat 5. , The EGR gas is set to flow in a direction perpendicular to the valve seat 5, so that a large amount of EGR gas flows outside the curve in the upstream curved portion 3 and the corner inside the curved portion of the downstream curved portion 7. Peeling occurred at the part. However, as in the present embodiment, the bending end 4 of the upstream bending portion 3 is made to coincide with the upstream end face of the valve seat 5 and the vicinity of the valve seat 5 is formed in the downstream bending portion 7. In this case, the EGR flowing through the EGR passage 1
Since the gas immediately flows into the valve seat 5 while undergoing the direction changing action of the upstream curved portion 3, the EGR gas flows into the valve seat 5 as a whole from an oblique direction and flows out into the oblique direction. Accordingly, in the downstream curved portion 7, the flow outside the curved portion increases, and the flow inside the curved portion is relatively reduced, so that separation at the curved inside corner portion is reduced, so that the flow loss is reduced. Therefore, the EGR passage 1 and the valve seat 5
A large amount of EGR gas can be supplied without increasing the size of the EGR gas, and the target EGR rate can be secured. In addition, since the downstream bending portion 7 that curves in the direction opposite to the upstream bending portion 3 is provided at the upstream end portion of the intake passage 8, the vicinity of the valve seat 5 is defined as the bending start end 6. For example, the thermal load on the EGR valve device can be reduced without using a heat insulator or the like. In the above-described embodiment, the bending end 4 of the upstream bending portion 3 coincides with the upstream end face of the valve seat 5, while the bending start end 6 of the downstream bending portion is positioned substantially at the center of the valve seat 5. However, in the case where the two are matched or the bending end of the upstream bending portion 3 is positioned downstream of the valve seat 5 within a range that does not sacrifice the passage area of the upstream bending portion 3, EGR is performed. Since the gas inflow angle can be reduced, there is an advantage that the loss caused by providing the EGR valve can be further reduced. As is apparent from the above description, according to the present invention, the curved end of the upstream curved portion constituting the end portion of the EGR passage is located at least downstream of the upstream end face of the valve seat. Since the downstream curved portion that curves in the direction opposite to the upstream curved portion with the vicinity of the valve seat as the curved start end is provided at the upstream end of the intake passage, the thermal load on the EGR valve device is reduced. In addition, since the EGR gas can flow into and out of the valve seat in an oblique direction, the flow loss caused by the EGR valve device can be reduced.
【図面の簡単な説明】
【図１】本発明に係るＥＧＲバルブ装置の一実施形態を
示す断面図である。
【図２】ＥＧＲバルブ装置の従来例を示す断面図であ
る。
【符号の説明】
１ ＥＧＲ通路
２ エルボ
３ 上流側湾曲部
４ 湾曲終端
５ 弁座
６ 湾曲始端
７ 下流側湾曲部
８ 吸気通路
９ バルブBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of an EGR valve device according to the present invention. FIG. 2 is a sectional view showing a conventional example of an EGR valve device. [Description of Signs] 1 EGR passage 2 Elbow 3 Upstream curved section 4 Curved end 5 Valve seat 6 Curved start end 7 Downstream curved section 8 Intake path 9 Valve
Claims (1)
端部と吸気通路８の接続部に弁座５を設け、該弁座５に
ＥＧＲ通路１側から着座させたバルブ９を吸気通路８側
に保持させたＥＧＲバルブ装置において、前記ＥＧＲ通
路１の終端部分を構成する上流側湾曲部３の湾曲終端４
を少なくとも弁座５の上流側端面より下流側に位置させ
るとともに、該弁座５の近傍を湾曲始端６として上流側
湾曲部３と逆の方向に向って湾曲する下流側湾曲部７を
吸気通路８の上流端部に設けたことを特徴とするＥＧＲ
バルブ装置。(57) the valve seat 5 to the connecting portion of the Claims 1] and the end of the EGR passage 1 which branches from the exhaust passage intake passage 8 is provided, seated on the valve seat 5 from the EGR passage 1 side In the EGR valve device in which the operated valve 9 is held on the intake passage 8 side, the curved end 4 of the upstream curved portion 3 that constitutes the end of the EGR passage 1
Is positioned at least downstream of the upstream end face of the valve seat 5 , and the downstream curved portion 7 that curves in the direction opposite to the upstream curved portion 3 with the vicinity of the valve seat 5 as a curved start end 6 is formed as an intake passage. EGR, characterized in that provided at the upstream end of the 8
Valve device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24788498A JP3474450B2 (en) | 1998-09-02 | 1998-09-02 | EGR valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24788498A JP3474450B2 (en) | 1998-09-02 | 1998-09-02 | EGR valve device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000073880A JP2000073880A (en) | 2000-03-07 |
| JP3474450B2 true JP3474450B2 (en) | 2003-12-08 |
Family
ID=17170040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24788498A Expired - Lifetime JP3474450B2 (en) | 1998-09-02 | 1998-09-02 | EGR valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3474450B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7393370B2 (en) * | 2021-02-17 | 2023-12-06 | 日本サーモスタット株式会社 | thermostat device |
-
1998
- 1998-09-02 JP JP24788498A patent/JP3474450B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000073880A (en) | 2000-03-07 |
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