JP2015094275A - Exhaust gas recirculation valve - Google Patents

Exhaust gas recirculation valve Download PDF

Info

Publication number
JP2015094275A
JP2015094275A JP2013233862A JP2013233862A JP2015094275A JP 2015094275 A JP2015094275 A JP 2015094275A JP 2013233862 A JP2013233862 A JP 2013233862A JP 2013233862 A JP2013233862 A JP 2013233862A JP 2015094275 A JP2015094275 A JP 2015094275A
Authority
JP
Japan
Prior art keywords
flow path
valve
valve seat
housing
exhaust gas
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
Application number
JP2013233862A
Other languages
Japanese (ja)
Inventor
羽田野　真
Makoto Hatano
真 羽田野
建 清永
Ken Kiyonaga
建 清永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisan Industry Co Ltd
Original Assignee
Aisan Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aisan Industry Co Ltd filed Critical Aisan Industry Co Ltd
Priority to JP2013233862A priority Critical patent/JP2015094275A/en
Publication of JP2015094275A publication Critical patent/JP2015094275A/en
Pending legal-status Critical Current

Links

Images

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)
  • Valve Housings (AREA)

Abstract

PROBLEM TO BE SOLVED: To easily increase a maximum flow rate of an EGR gas flowing in a flow channel of a housing of an EGR valve.SOLUTION: An EGR valve 1 includes: a metallic housing 3 including a flow channel 2; a valve seat 4 disposed in the flow channel 2; a valving element 5 detachably disposed on the valve seat 4 and forming a measuring portion with the valve seat 2; and an actuator 7 for driving the valving element 5. By moving the valving element 5 relative to the valve seat 4 by the actuator 7 and varying an opening area of the measuring portion, an EGR gas flow rate in the flow channel 2 is adjusted. The housing 3 includes a tubular flow channel member 8 manufactured separately from the housing 3. The flow channel 2 is configured by making a flow channel member 8 casted in the housing 3. The flow channel member 8 has an inner face shape continuously and smoothly changed in the flowing direction of the EGR gas.

Description

この発明は、排気還流装置（Exhaust Gas Recirculation（ＥＧＲ）装置）の排気還流通路に設けられる排気還流バルブに関する。   The present invention relates to an exhaust gas recirculation valve provided in an exhaust gas recirculation passage of an exhaust gas recirculation (EGR) device.

従来、この種の技術として、例えば、図４に示すようなポペット弁構造の排気還流バルブ（ＥＧＲバルブ）３１が知られている。従来のＥＧＲバルブ３１は、ＥＧＲガスの流路３２を含むハウジング３３と、流路３２に組み付けられた弁座３４と、弁座３４に着座可能に設けられ、弁座３４との間でＥＧＲガスの計量部を形成する弁体３５と、弁体３５を弁座３４に対して移動させるために弁体３５が一端部に設けられた弁軸３６と、弁体３５と共に弁軸３６を軸方向へストローク運動させるためのモータ等よりなるアクチュエータ３７とを備える。そして、アクチュエータ３７により弁軸３６を弁体３５と共にストローク運動させることにより、計量部の開口面積を調節し、流路３２におけるＥＧＲガスの流量を調節するようになっている。下記の特許文献１には、この種のＥＧＲバルブの一例が記載されている。図４は、従来のＥＧＲバルブ３１の全閉状態を断面図により示す。   Conventionally, as this type of technology, for example, an exhaust gas recirculation valve (EGR valve) 31 having a poppet valve structure as shown in FIG. 4 is known. The conventional EGR valve 31 includes a housing 33 including an EGR gas flow path 32, a valve seat 34 assembled to the flow path 32, and a seat that can be seated on the valve seat 34. A valve body 35 that forms a metering portion, a valve shaft 36 provided at one end to move the valve body 35 relative to the valve seat 34, and the valve shaft 36 together with the valve body 35 in the axial direction. And an actuator 37 made of a motor or the like for making a stroke movement. The actuator 37 moves the valve shaft 36 together with the valve body 35 so as to adjust the opening area of the measuring portion and adjust the flow rate of the EGR gas in the flow path 32. The following Patent Document 1 describes an example of this type of EGR valve. FIG. 4 is a sectional view showing the fully closed state of the conventional EGR valve 31.

ここで、ハウジング３３は金属材料により金型成形される。図５に、図４の鎖線四角Ｓ２で囲った部分につき、ハウジング３３の流路３２の成形方法の一部を拡大断面図により示す。図５に示すように、金型によりハウジング３３の流路３２を成形するために、角柱状の二つの入れ子４１，４２が使用され、それらが直角に接するように配置される。   Here, the housing 33 is molded by a metal material. FIG. 5 is an enlarged cross-sectional view showing a part of the method for forming the flow path 32 of the housing 33 for the portion surrounded by the chain line square S2 in FIG. As shown in FIG. 5, in order to form the flow path 32 of the housing 33 by a mold, two prismatic inserts 41 and 42 are used and arranged so that they are in contact with each other at a right angle.

特開２００８−１４８４９４号公報JP 2008-148494 A

ところが、従来のＥＧＲバルブ３１は、上記したようにハウジング３３の流路３２が入れ子４１，４２を使用して成形されることから、図６に示すように、入れ子４１，４２との合わせ面Ｐ１１〜Ｐ１３の部分が弁座３４に対して不連続な平坦面となったり、コーナＲ１１，Ｒ１２の部分がピン角となったりしていた。このため、流路３２の内面に段差や不連続な面ができてしまい、ＥＧＲガスにとって圧力損失の要因となっていた。このためＥＧＲガスの最大流量を増やすことができなかった。特に、近時のＥＧＲ装置には、大量ＥＧＲの要求があることから、ＥＧＲバルブを大型化することなくＥＧＲガスの最大流量を増やすことが望まれている。ここで、流路３２におけるＥＧＲガスの圧力損失を低減するために、流路３２の内面が滑らかに連続するように加工する必要がある。しかしながら、金型成形後に切削加工等を行うことは、手間を要し難しい作業となってしまう。図６は、図４の鎖線四角２で囲った部分を拡大断面図により示す。   However, in the conventional EGR valve 31, the flow path 32 of the housing 33 is formed using the inserts 41 and 42 as described above. Therefore, as shown in FIG. 6, the mating surface P <b> 11 with the inserts 41 and 42. The portion of P13 is a discontinuous flat surface with respect to the valve seat 34, or the portions of the corners R11 and R12 are pin angles. For this reason, a step or a discontinuous surface is formed on the inner surface of the flow path 32, which is a cause of pressure loss for the EGR gas. For this reason, the maximum flow rate of EGR gas could not be increased. In particular, recent EGR devices have demands for large amounts of EGR, and therefore it is desired to increase the maximum flow rate of EGR gas without increasing the size of the EGR valve. Here, in order to reduce the pressure loss of the EGR gas in the flow path 32, it is necessary to process the inner surface of the flow path 32 so as to be smoothly continuous. However, it is difficult and difficult to perform cutting and the like after mold forming. FIG. 6 is an enlarged cross-sectional view showing a portion surrounded by a chain line square 2 in FIG.

この発明は、上記事情に鑑みてなされたものであって、その目的は、ハウジングの流路を流れる排気還流ガスの最大流量を容易に増加させることを可能とした排気還流バルブを提供することになる。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust gas recirculation valve capable of easily increasing the maximum flow rate of exhaust gas recirculation gas flowing through the flow path of the housing. Become.

上記目的を達成するために、請求項１に記載の発明は、排気還流ガスの流路を含み、金属材料により鋳造されたハウジングと、流路に設けられた弁座と、弁座に着座可能に設けられ、弁座との間で排気還流ガスの計量部を形成する弁体とを備え、弁体を弁座に対して移動させて計量部の開口面積を変化させることにより流路における排気還流ガスの流量を調節する排気還流バルブにおいて、ハウジングとは別に製造された管状の流路部材を備え、流路部材がハウジングに鋳ぐるまれることにより流路が構成され、流路部材は排気還流ガスが流れる方向において連続的に滑らかに変化する内面形状を有することを趣旨とする。   In order to achieve the above-mentioned object, the invention according to claim 1 includes a housing made of a metal material, including a flow path for exhaust gas recirculation gas, a valve seat provided in the flow path, and seatable on the valve seat And a valve body that forms an exhaust recirculation gas metering section with the valve seat, and the exhaust in the flow path is changed by changing the opening area of the metering section by moving the valve body relative to the valve seat An exhaust gas recirculation valve that adjusts the flow rate of the recirculation gas includes a tubular flow path member manufactured separately from the housing, and the flow path member is cast into the housing to form a flow path. It is intended to have an inner surface shape that continuously and smoothly changes in the direction in which the reflux gas flows.

上記発明の構成によれば、ハウジングとは別に製造された管状の流路部材が、ハウジングに鋳ぐるまれることにより流路が構成されるので、流路部材の形状を設定することにより流路の形状の自由度が向上し、その流路がハウジングに容易に形成される。また、流路部材は排気還流ガスが流れる方向において連続的に滑らかに変化する内面形状を有するので、排気還流ガスの流れに渦や乱流の発生が少なくなる。   According to the configuration of the invention, since the tubular flow path member manufactured separately from the housing is cast in the housing, the flow path is configured, so that the flow path can be set by setting the shape of the flow path member. The degree of freedom of the shape is improved, and the flow path is easily formed in the housing. In addition, since the flow path member has an inner surface shape that changes smoothly and continuously in the direction in which the exhaust gas recirculation gas flows, generation of vortices and turbulence in the flow of the exhaust gas recirculation gas is reduced.

上記目的を達成するために、請求項２に記載の発明は、請求項１に記載の発明において、流路部材は、弁座として機能する弁座部を含むことを趣旨とする。   In order to achieve the above object, the invention described in claim 2 is characterized in that, in the invention described in claim 1, the flow path member includes a valve seat portion functioning as a valve seat.

上記発明の構成によれば、請求項１に記載の発明の作用に加え、流路部材が弁座として機能する弁座部を含むので、弁座を別部材で組み付ける必要がない。   According to the configuration of the above invention, in addition to the operation of the invention described in claim 1, since the flow path member includes the valve seat portion that functions as the valve seat, it is not necessary to assemble the valve seat as a separate member.

上記目的を達成するために、請求項３に記載の発明は、請求項２に記載の発明において、流路部材は、流路の入口と出口に対応する入口部と出口部を含み、入口部は弁座部より上流側にて入口へ向けてラッパ形状に広がることを趣旨とする。   In order to achieve the above object, according to a third aspect of the present invention, in the second aspect of the present invention, the flow path member includes an inlet section and an outlet section corresponding to the inlet and the outlet of the flow path. Is intended to spread in a trumpet shape toward the inlet upstream from the valve seat.

上記発明の構成によれば、請求項２に記載の発明の作用に加え、流路部材は、入口部が弁座部より上流側にて入口へ向けてラッパ形状に広がるので、入口部から弁座部へ向けて排気還流ガスが円滑に流れる。また、ラッパ状に広がる部分で鋳造用の型抜きが容易となる。   According to the configuration of the invention described above, in addition to the operation of the invention according to claim 2, the flow path member has a trumpet shape in which the inlet portion extends upstream from the valve seat portion toward the inlet. The exhaust gas recirculates smoothly toward the seat. In addition, it is easy to die for casting at a portion spreading in a trumpet shape.

上記目的を達成するために、請求項４に記載の発明は、請求項３に記載の発明において、流路部材は、入口部が円形状又は多角形状をなすことを趣旨とする。   In order to achieve the above object, the invention according to claim 4 is the invention according to claim 3, wherein the flow path member has a circular or polygonal inlet portion.

上記発明の構成によれば、請求項３に記載の発明の作用に加え、流路部材の入口部が円形状又は多角形状をなすので、入口部の中心を決定することが容易となる。   According to the configuration of the invention described above, in addition to the operation of the invention according to claim 3, since the inlet portion of the flow path member has a circular shape or a polygonal shape, it is easy to determine the center of the inlet portion.

上記目的を達成するために、請求項５に記載の発明は、請求項３に記載の発明において、流路部材は、入口部及び出口部が円形状又は多角形状をなすことを趣旨とする。   In order to achieve the above object, the invention according to claim 5 is the invention according to claim 3, wherein the flow path member has a circular shape or a polygonal shape at the inlet portion and the outlet portion.

上記発明の構成によれば、請求項３に記載の発明の作用に加え、流路部材の入口部又は出口部が円形状又は多角形状をなすので、流路部材がハウジングに鋳ぐるまれたときのハウジングに対する流路部材の位置決めが容易となる。   According to the configuration of the above invention, in addition to the action of the invention according to claim 3, the inlet portion or the outlet portion of the flow path member has a circular shape or a polygonal shape, so that the flow path member is cast in the housing. Positioning of the flow path member with respect to the housing becomes easy.

上記目的を達成するために、請求項６に記載の発明は、請求項４又は５に記載の発明において、入口部は、ラッパ状に広がる部分より更に上流側にて入口へ向けて円筒状に延びることを趣旨とする。   In order to achieve the above object, according to a sixth aspect of the invention, in the invention of the fourth or fifth aspect, the inlet portion is formed in a cylindrical shape toward the inlet at a further upstream side than the portion spreading in a trumpet shape. The purpose is to extend.

上記発明の構成によれば、請求項４又は５に記載の発明の作用に加え、入口部が、ラッパ状に広がる部分より更に上流側にて入口へ向けて円筒状に延びるので、その円筒状に延びる部分により流路部材のハウジングに対する位置決めが更に容易となる。   According to the configuration of the invention, in addition to the action of the invention according to claim 4 or 5, the inlet portion extends in a cylindrical shape toward the inlet further upstream from the portion spreading in a trumpet shape. Positioning the flow path member with respect to the housing is further facilitated by the portion extending to.

請求項１に記載の発明によれば、ハウジングの流路を流れる排気還流ガスの最大流量を容易に増加させることができる。   According to the first aspect of the present invention, the maximum flow rate of the exhaust gas recirculation gas flowing through the flow path of the housing can be easily increased.

請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、排気還流バルブを構成する部品点数を弁座の分だけ少なくすることができる。   According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the number of parts constituting the exhaust gas recirculation valve can be reduced by the amount of the valve seat.

請求項３に記載の発明によれば、請求項２に記載の発明の効果に加え、排気還流ガスの最大流量を更に増加させることができ、ハウジングの鋳造を容易化することができる。   According to the invention of claim 3, in addition to the effect of the invention of claim 2, the maximum flow rate of the exhaust gas recirculation gas can be further increased, and the casting of the housing can be facilitated.

請求項４に記載の発明によれば、請求項３に記載の発明の効果に加え、入口部に対する弁軸の軸合わせを容易なものにすることができる。   According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, it is possible to easily align the valve shaft with the inlet.

請求項５に記載の発明によれば、請求項３に記載の発明の効果に加え、弁座に対する弁体の軸合わせ精度を向上させることができる。   According to the invention described in claim 5, in addition to the effect of the invention described in claim 3, it is possible to improve the alignment accuracy of the valve body with respect to the valve seat.

請求項６に記載の発明によれば、請求項４又は５に記載の発明の効果に加え、弁座に対する弁体の軸合わせ精度を更に向上させることができる。   According to the invention described in claim 6, in addition to the effect of the invention described in claim 4 or 5, the accuracy of axial alignment of the valve body with respect to the valve seat can be further improved.

一実施形態に係り、全閉状態のＥＧＲバルブを示す正断面図。The front sectional view showing an EGR valve in a fully closed state concerning one embodiment. 一実施形態に係り、図１の鎖線四角で囲った部分を示す拡大断面図。The expanded sectional view which shows the part which concerns on one Embodiment and was enclosed with the dashed-line square of FIG. 一実施形態に係り、流路部材を示す斜視図。The perspective view which concerns on one Embodiment and shows a flow-path member. 従来例に係り、従来のＥＧＲバルブの全閉状態を示す断面図。Sectional drawing which shows the fully closed state of the conventional EGR valve concerning a prior art example. 従来例に係り、図４の鎖線四角で囲った部分につき、流路の成形方法の一部を示す拡大断面図。The expanded sectional view which shows a part of shaping | molding method of a flow path about the part enclosed with the chain line square of FIG. 4 concerning a prior art example. 従来例に係り、図４の鎖線四角で囲った部分を示す拡大断面図。The expanded sectional view which shows the part which concerns on the prior art example and was enclosed with the chain line square of FIG.

以下、本発明の排気還流バルブ（ＥＧＲバルブ）を具体化した一実施形態につき図面を参照して詳細に説明する。   Hereinafter, an embodiment of an exhaust gas recirculation valve (EGR valve) according to the present invention will be described in detail with reference to the drawings.

図１に、全閉状態のＥＧＲバルブ１を正断面図により示す。図２に、図１の鎖線四角Ｓ１で囲った部分を拡大断面図により示す。ＥＧＲバルブ１は、エンジンから排出される排気ガスの一部をＥＧＲガスとして吸気通路へ戻すＥＧＲ通路に設けられ、ＥＧＲガス流量を調節するために使用される。   FIG. 1 is a front sectional view of the EGR valve 1 in the fully closed state. FIG. 2 is an enlarged sectional view showing a portion surrounded by a chain line square S1 in FIG. The EGR valve 1 is provided in an EGR passage that returns part of the exhaust gas discharged from the engine to the intake passage as EGR gas, and is used to adjust the EGR gas flow rate.

図１、図２に示すように、ＥＧＲバルブ１は、ポペット弁構造をなし、ＥＧＲガスの流路２を含み、金属材料により製造されたハウジング３と、流路２の中間に設けられた弁座４と、弁座４に着座可能に設けられ、弁座４との間でＥＧＲガスの計量部を形成する弁体５と、弁体５を弁座４に対して移動させるために弁体５が一端部に設けられた弁軸６と、弁軸６を弁体５と共に駆動するためのアクチュエータ７とを備える。アクチュエータ７は、ＤＣモータより構成され、弁軸６を弁体５と共に軸方向へ往復運動（ストローク運動）させるように構成される。このＥＧＲバルブ１は、アクチュエータ７により弁体５を弁座４に対して移動させて計量部の開口面積を変化させることにより、流路２におけるＥＧＲガス流量を調節するように構成される。この実施形態では、アクチュエータ７の構成の詳しい説明は省略する。流路２の両端は、ＥＧＲガスが導入される入口２ａと、ＥＧＲガスが導出される出口２ｂとなっている。   As shown in FIG. 1 and FIG. 2, the EGR valve 1 has a poppet valve structure, includes a flow path 2 for EGR gas, and is provided between a housing 3 made of a metal material and a middle of the flow path 2. A valve body 5 provided so as to be seated on the seat 4 and the valve seat 4 and forming a measuring portion of EGR gas with the valve seat 4; and a valve body for moving the valve body 5 relative to the valve seat 4 5 includes a valve shaft 6 provided at one end, and an actuator 7 for driving the valve shaft 6 together with the valve body 5. The actuator 7 is composed of a DC motor, and is configured to reciprocate the valve shaft 6 together with the valve body 5 in the axial direction (stroke motion). The EGR valve 1 is configured to adjust the EGR gas flow rate in the flow path 2 by moving the valve element 5 with respect to the valve seat 4 by the actuator 7 to change the opening area of the metering portion. In this embodiment, detailed description of the configuration of the actuator 7 is omitted. Both ends of the flow path 2 are an inlet 2a through which EGR gas is introduced and an outlet 2b through which EGR gas is led out.

この実施形態において、ハウジング３はアルミニウム等の金属材料により鋳造される。ハウジング３は、ハウジング３とは別に金属材料により製造された管状の流路部材８を備える。この流路部材８がハウジング３に鋳ぐるまれることにより流路２が構成される。また、図１、図２に示すように、流路部材８は、ＥＧＲガスが流れる方向において連続的に滑らかに変化する内面形状を有する。図３に、この流路部材８を斜視図により示す。流路部材８は、全体が略鉤形に屈曲しており、そのコーナの部分は滑らかに湾曲するように形成される。流路２は、この流路部材８の中空部により構成される。図１、図２に示すように、流路部材８は、弁座４として機能する弁座部８ａを含む。図１〜図３に示すように、流路部材８は、流路２の入口２ａと出口２ｂに対応する筒状の入口部８ｂと出口部８ｃと、弁座部８ａより上流側にて入口２ａへ向けてラッパ形状に広がる拡口部８ｄと、拡口部８ｄより更に上流側にて入口２ａへ向けて円筒状に延びる円筒部８ｅとを備える。流路部材８は、弁座部４より下流側の部分の概形が四角筒状をなしている。よって、出口部８ｃは四角形状をなし、入口部８ｂは円形状をなしている。   In this embodiment, the housing 3 is cast from a metal material such as aluminum. The housing 3 includes a tubular flow path member 8 made of a metal material separately from the housing 3. The flow path 2 is configured by casting the flow path member 8 in the housing 3. As shown in FIGS. 1 and 2, the flow path member 8 has an inner surface shape that changes smoothly and smoothly in the direction in which the EGR gas flows. FIG. 3 is a perspective view of the flow path member 8. The entire flow path member 8 is bent in a substantially bowl shape, and the corner portion is formed to be smoothly curved. The flow path 2 is constituted by a hollow portion of the flow path member 8. As shown in FIGS. 1 and 2, the flow path member 8 includes a valve seat portion 8 a that functions as the valve seat 4. As shown in FIGS. 1 to 3, the flow path member 8 includes a cylindrical inlet portion 8 b and an outlet portion 8 c corresponding to the inlet 2 a and the outlet 2 b of the flow channel 2, and an inlet on the upstream side of the valve seat portion 8 a. An opening portion 8d that spreads in a trumpet shape toward 2a and a cylindrical portion 8e that extends in a cylindrical shape toward the inlet 2a further upstream from the opening portion 8d. The flow path member 8 has a quadrangular cylindrical shape in a portion downstream of the valve seat portion 4. Accordingly, the outlet portion 8c has a rectangular shape, and the inlet portion 8b has a circular shape.

流路部材８は、例えば、ステンレス等の金属材料により製造される。例えば、金属板材をプレス成形することで流路部材８の概形をつくることができる。その後、細部を仕上げ加工することで最終形状とすることができる。最後に、流路部材８の外面にショットブラストをかけてハウジング３との鋳ぐるみの合性を向上させることができる。   The flow path member 8 is manufactured from, for example, a metal material such as stainless steel. For example, the rough shape of the flow path member 8 can be formed by press-molding a metal plate material. Thereafter, the final shape can be obtained by finishing the details. Finally, shot blasting can be applied to the outer surface of the flow path member 8 to improve the compatibility with the housing 3.

この他、この実施形態のＥＧＲバルブ１では、図５、図７に示す従来のＥＧＲバルブ３１と比較して、流路２の内面形状が次のように異なる。すなわち、図１、図２に示すように、弁座４の直下流から順に、流路３の第１部位Ｐ１が下流側へ向けて傾斜し、第２部位Ｐ２が湾曲しており、第３部位Ｐ３が下流側へ向けて拡がるように傾斜している。   In addition, in the EGR valve 1 of this embodiment, the inner surface shape of the flow path 2 is different from that of the conventional EGR valve 31 shown in FIGS. 5 and 7 as follows. That is, as shown in FIGS. 1 and 2, the first part P1 of the flow path 3 is inclined toward the downstream side in order from the immediately downstream side of the valve seat 4, and the second part P2 is curved, The part P3 is inclined so as to expand toward the downstream side.

弁軸６は、アクチュエータ７と弁体５との間に設けられ、図１において、ハウジング３と流路部材８を垂直に貫通して配置される。弁体５は、略円錐形状をなし、弁軸６の下端部に設けられる。ハウジング３と弁軸６との間には、弁軸６をストローク運動可能に支持するために直列に配置された第１スラスト軸受１１と第２スラスト軸受１２が設けられる。各スラスト軸受１１，１２は、略筒形をなし、ハウジング３の中心に形成された組付孔３ａに嵌合されて固定される。   The valve shaft 6 is provided between the actuator 7 and the valve body 5, and is disposed so as to vertically penetrate the housing 3 and the flow path member 8 in FIG. 1. The valve body 5 has a substantially conical shape and is provided at the lower end of the valve shaft 6. Between the housing 3 and the valve shaft 6, there are provided a first thrust bearing 11 and a second thrust bearing 12 arranged in series to support the valve shaft 6 so as to be capable of stroke movement. Each thrust bearing 11, 12 has a substantially cylindrical shape, and is fitted and fixed in an assembly hole 3 a formed at the center of the housing 3.

ハウジング３には、ハウジング３と弁軸６との間をシールするための略円筒状をなすリップシール１３が、第２スラスト軸受１２に隣接して設けられる。リップシール１３は組付孔３ａに直接圧入される。   The housing 3 is provided with a substantially cylindrical lip seal 13 adjacent to the second thrust bearing 12 for sealing between the housing 3 and the valve shaft 6. The lip seal 13 is directly press-fitted into the assembly hole 3a.

前述したように、流路部材８は、ハウジング３を鋳造する際に、ハウジング３と一体的に鋳ぐるまれる。この段階で、流路部材８には、弁軸６を貫通させる孔８ｆ（図１、図２参照）はない。この孔８ｆは、ハウジング３に流路部材８が鋳ぐるまれてから、別工程で開けられる。   As described above, the flow path member 8 is cast integrally with the housing 3 when the housing 3 is cast. At this stage, the flow path member 8 does not have a hole 8f (see FIGS. 1 and 2) through which the valve shaft 6 passes. The hole 8f is opened in a separate process after the flow path member 8 is cast in the housing 3.

以上説明したこの実施形態のＥＧＲバルブ１によれば、ハウジング３とは別に製造された管状の流路部材８が、ハウジング３に鋳ぐるまれることにより流路２が構成される。従って、流路部材８の形状を任意に設定することにより、流路２の形状の自由度が向上し、その流路２がハウジング３に容易に形成される。また、流路部材８はＥＧＲガスが流れる方向において連続的に滑らかに変化する内面形状を有するので、ＥＧＲガスの流れに渦や乱流の発生が少なくなる。このため、ハウジング３の流路２を流れるＥＧＲガスについて圧力損失を容易に低減することができ、そのＥＧＲガスの最大流量を容易に増加させることができる。この結果、ハウジング３を大型化させることなくＥＧＲガスの最大流量を１０％〜３０％程度増加させることができ、大量ＥＧＲの要求にも対応することができる。   According to the EGR valve 1 of this embodiment described above, the flow path 2 is configured by casting the tubular flow path member 8 manufactured separately from the housing 3 into the housing 3. Therefore, by arbitrarily setting the shape of the flow path member 8, the degree of freedom of the shape of the flow path 2 is improved, and the flow path 2 is easily formed in the housing 3. Further, since the flow path member 8 has an inner surface shape that continuously and smoothly changes in the direction in which the EGR gas flows, the occurrence of vortices and turbulence in the EGR gas flow is reduced. For this reason, it is possible to easily reduce the pressure loss of the EGR gas flowing through the flow path 2 of the housing 3, and to easily increase the maximum flow rate of the EGR gas. As a result, the maximum flow rate of the EGR gas can be increased by about 10% to 30% without increasing the size of the housing 3, and the demand for a large amount of EGR can be met.

また、この実施形態では、流路部材８が弁座４として機能する弁座部８ａを含むので、弁座４を別部材として製造しそれを組み付ける必要がない。このため、ＥＧＲバルブ１を構成する部品点数を弁座４の分だけ少なくすることができる。   Moreover, in this embodiment, since the flow path member 8 includes the valve seat portion 8a that functions as the valve seat 4, it is not necessary to manufacture the valve seat 4 as a separate member and assemble it. For this reason, the number of parts constituting the EGR valve 1 can be reduced by the amount corresponding to the valve seat 4.

この実施形態で、流路部材８は、弁座部８ａより上流側にて入口２ａへ向けてラッパ形状に広がる拡口部８ｄを含む。従って、入口部８ｂから弁座部８ａへ向けてＥＧＲガスが円滑に流れ、また、拡口部８ｄの部分で鋳造用の型抜きが容易となる。このため、ＥＧＲガスの最大流量を更に増加させることができ、ハウジング３の鋳造を容易化することができる。   In this embodiment, the flow path member 8 includes a widened portion 8d that spreads in a trumpet shape toward the inlet 2a on the upstream side of the valve seat portion 8a. Therefore, the EGR gas smoothly flows from the inlet portion 8b toward the valve seat portion 8a, and the die for casting can be easily cut at the expanded portion 8d. For this reason, the maximum flow rate of EGR gas can be further increased, and the casting of the housing 3 can be facilitated.

この実施形態では、流路部材８の入口部８ｂが円形状をなすので、入口部８ｂの中心を決定することが容易となる。このため、入口部８ｂに対する弁軸６の軸合わせを容易なものにすることができる。   In this embodiment, since the inlet portion 8b of the flow path member 8 has a circular shape, it is easy to determine the center of the inlet portion 8b. For this reason, the axial alignment of the valve shaft 6 with respect to the inlet portion 8b can be facilitated.

この実施形態では、流路部材８の入口部８ｂ（円筒部８ｅ）が円形状をなし、出口部８ｃが四角形状をなすので、流路部材８がハウジング３に鋳ぐるまれるときのハウジング３に対する流路部材８の位置決めが容易となる。このため、弁座４に対する弁体５の軸合わせ精度を向上させることができる。   In this embodiment, the inlet portion 8b (cylindrical portion 8e) of the flow path member 8 has a circular shape and the outlet portion 8c has a rectangular shape. Therefore, the housing 3 when the flow path member 8 is cast around the housing 3 is used. Positioning of the flow path member 8 with respect to is easy. For this reason, the axial alignment precision of the valve body 5 with respect to the valve seat 4 can be improved.

この実施形態では、入口部８ｂは、拡口部８ｄより更に上流側にて入口２ａへ向けて延びる円筒部８ｅを含む。従って、流路部材８のハウジング３に対する位置決めが、円筒部８ｅにより更に容易となる。その結果、弁座４に対する弁体５の軸合わせ精度を更に向上させることができる。   In this embodiment, the inlet portion 8b includes a cylindrical portion 8e that extends toward the inlet 2a on the further upstream side than the enlarged-portion portion 8d. Accordingly, the positioning of the flow path member 8 with respect to the housing 3 is further facilitated by the cylindrical portion 8e. As a result, the alignment accuracy of the valve body 5 with respect to the valve seat 4 can be further improved.

更に、この実施形態では、流路２の内面形状につき、第１部位Ｐ１が下流側へ向けて傾斜し、第２部位Ｐ２が湾曲しており、第３部位Ｐ３が下流側へ向けて拡がるように傾斜している。従って、これら流路２の内面形状によっても、弁座４から流れ出たＥＧＲガスを流路３の下流側へ円滑に流すことができ、ＥＧＲガスの流速を維持又は増加させることができ、ＥＧＲガスの最大流量を更に増加させることができる。   Furthermore, in this embodiment, with respect to the inner surface shape of the flow path 2, the first part P1 is inclined toward the downstream side, the second part P2 is curved, and the third part P3 is expanded toward the downstream side. It is inclined to. Therefore, the EGR gas flowing out from the valve seat 4 can be smoothly flowed to the downstream side of the flow path 3 also by the inner surface shape of these flow paths 2, and the flow rate of the EGR gas can be maintained or increased. The maximum flow rate can be further increased.

なお、この発明は前記実施形態に限定されるものではなく、発明の趣旨を逸脱することのない範囲で構成の一部を適宜変更して実施することもできる。   In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

例えば、前記実施形態では、アクチュエータ７をモータにより構成したが、ダイアフラム式アクチュエータを使用することもできる。   For example, in the above-described embodiment, the actuator 7 is configured by a motor, but a diaphragm actuator may be used.

また、前記実施形態では、ＥＧＲ弁１をポペット弁構造に構成したが、ポペット弁構造以外の構造についても、流路を含むハウジングについては、前記実施形態と同様に実施することができる。   Moreover, in the said embodiment, although the EGR valve 1 was comprised in the poppet valve structure, about structures other than a poppet valve structure, it can implement similarly to the said embodiment about the housing containing a flow path.

更に、前記実施形態では、流路部材８の出口部８ｃを四角形状とし、入口部８ｂを円形状に構成したが、出口部を円形状とし、入口部を多角形状に構成することもできる。あるいは、出口部と入口部の両方を円形状に構成したり、多角形状に構成したりすることもできる。   Furthermore, in the said embodiment, although the exit part 8c of the flow-path member 8 was made into square shape and the inlet part 8b was comprised circularly, an outlet part can be made circular and an inlet part can also be comprised in polygonal shape. Or both an exit part and an entrance part can be constituted circularly, or can be constituted polygonally.

この発明は、ガソリンエンジンやディーゼルエンジンに設けられるＥＧＲ装置に利用することができる。   The present invention can be used for an EGR device provided in a gasoline engine or a diesel engine.

１ ＥＧＲバルブ
２ 流路
２ａ 入口
２ｂ 出口
３ ハウジング
３ａ 組付け孔
４ 弁座
５ 弁体
６ 弁軸
８ 流路部材
８ａ 弁座部
８ｂ 入口部
８ｃ 出口部
８ｄ 拡口部
８ｅ 円筒部 DESCRIPTION OF SYMBOLS 1 EGR valve 2 Flow path 2a Inlet 2b Outlet 3 Housing 3a Assembly hole 4 Valve seat 5 Valve body 6 Valve shaft 8 Channel member 8a Valve seat part 8b Inlet part 8c Outlet part 8d Expanded part 8e Cylindrical part

Claims (6)

排気還流ガスの流路を含み、金属材料により鋳造されたハウジングと、
前記流路に設けられた弁座と、
前記弁座に着座可能に設けられ、前記弁座との間で前記排気還流ガスの計量部を形成する弁体と
を備え、前記弁体を前記弁座に対して移動させて前記計量部の開口面積を変化させることにより前記流路における前記排気還流ガスの流量を調節する排気還流バルブにおいて、
前記ハウジングとは別に製造された管状の流路部材を備え、前記流路部材が前記ハウジングに鋳ぐるまれることにより前記流路が構成され、前記流路部材は前記排気還流ガスが流れる方向において連続的に滑らかに変化する内面形状を有することを特徴とする排気還流バルブ。 A housing including a flow path for the exhaust recirculation gas and cast from a metal material;
A valve seat provided in the flow path;
A valve body that is slidably mounted on the valve seat and forms a metering portion for the exhaust gas recirculation gas with the valve seat, and the valve body is moved relative to the valve seat to In the exhaust gas recirculation valve that adjusts the flow rate of the exhaust gas recirculation gas in the flow path by changing the opening area,
A tubular flow path member manufactured separately from the housing; the flow path member is cast in the housing to form the flow path; An exhaust gas recirculation valve characterized by having an inner surface shape that changes continuously and smoothly. 前記流路部材は、前記弁座として機能する弁座部を含むことを特徴とする請求項１に記載の排気還流バルブ。   The exhaust gas recirculation valve according to claim 1, wherein the flow path member includes a valve seat portion that functions as the valve seat. 前記流路部材は、前記流路の入口と出口に対応する入口部と出口部を含み、前記入口部は前記弁座部より上流側にて前記入口へ向けてラッパ形状に広がることを特徴とする請求項２に記載の排気還流バルブ。   The flow path member includes an inlet and an outlet corresponding to an inlet and an outlet of the flow path, and the inlet expands in a trumpet shape toward the inlet upstream of the valve seat. The exhaust gas recirculation valve according to claim 2. 前記流路部材は、前記入口部が円形状又は多角形状をなすことを特徴とする請求項３に記載の排気還流バルブ。   The exhaust gas recirculation valve according to claim 3, wherein the flow path member has a circular shape or a polygonal shape at the inlet portion. 前記流路部材は、前記入口部及び前記出口部が円形状又は多角形状をなすことを特徴とする請求項３に記載の排気還流バルブ。   The exhaust gas recirculation valve according to claim 3, wherein the flow path member has a circular shape or a polygonal shape at the inlet portion and the outlet portion. 前記入口部は、前記ラッパ状に広がる部分より更に上流側にて前記入口へ向けて円筒状に延びることを特徴とする請求項４又は５に記載の排気還流バルブ。   6. The exhaust gas recirculation valve according to claim 4, wherein the inlet portion extends in a cylindrical shape toward the inlet at a further upstream side than the portion spreading in the trumpet shape.
JP2013233862A 2013-11-12 2013-11-12 Exhaust gas recirculation valve Pending JP2015094275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013233862A JP2015094275A (en) 2013-11-12 2013-11-12 Exhaust gas recirculation valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013233862A JP2015094275A (en) 2013-11-12 2013-11-12 Exhaust gas recirculation valve

Publications (1)

Publication Number Publication Date
JP2015094275A true JP2015094275A (en) 2015-05-18

Family

ID=53196860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013233862A Pending JP2015094275A (en) 2013-11-12 2013-11-12 Exhaust gas recirculation valve

Country Status (1)

Country Link
JP (1) JP2015094275A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3057478A1 (en) * 2016-10-14 2018-04-20 Valeo Systemes De Controle Moteur DEVICE FOR MAINTAINING AN OVERMOLD INSERT DURING THE MOLDING OF A VALVE BODY
WO2021054022A1 (en) * 2019-09-19 2021-03-25 愛三工業株式会社 Egr valve and egr valve device provided with same
WO2022191239A1 (en) * 2021-03-11 2022-09-15 株式会社イシザキ Check valve

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3057478A1 (en) * 2016-10-14 2018-04-20 Valeo Systemes De Controle Moteur DEVICE FOR MAINTAINING AN OVERMOLD INSERT DURING THE MOLDING OF A VALVE BODY
WO2021054022A1 (en) * 2019-09-19 2021-03-25 愛三工業株式会社 Egr valve and egr valve device provided with same
JP2021046830A (en) * 2019-09-19 2021-03-25 愛三工業株式会社 Egr valve and egr valve device having the same
CN114423938A (en) * 2019-09-19 2022-04-29 爱三工业株式会社 EGR valve and EGR valve device provided with same
US11913412B2 (en) 2019-09-19 2024-02-27 Aisan Kogyo Kabushiki Kaisha EGR valve and EGR valve device provided with same
CN114423938B (en) * 2019-09-19 2024-05-14 爱三工业株式会社 EGR valve and EGR valve device provided with same
WO2022191239A1 (en) * 2021-03-11 2022-09-15 株式会社イシザキ Check valve
TWI812060B (en) * 2021-03-11 2023-08-11 日商石崎股份有限公司 check valve

Similar Documents

Publication Publication Date Title
JP5988853B2 (en) Exhaust gas recirculation valve
JP5537512B2 (en) Fuel injection valve
JP4592793B2 (en) Fuel injection valve
US9404456B2 (en) Fuel injection valve
JP5295311B2 (en) Fuel injection valve
JP5984962B2 (en) Mixing valve
JP2014040791A (en) Flow rate control valve
US10571030B2 (en) Valve gate within a Venturi gap of a Venturi device for producing vacuum
JP2015094275A (en) Exhaust gas recirculation valve
US8919674B2 (en) Fuel injection valve
US9388773B2 (en) Exhaust gas recirculation valve
US20200263642A1 (en) Cobra head air intake ports and intake manifolds
JP2009243267A (en) Valve device
EP2787208B1 (en) Cylinder head for an internal-combustion engine with intake ducts having an air-deflecting projection
JP6230585B2 (en) Exhaust gas purification device for internal combustion engine
JP5769824B2 (en) Exhaust gas circulation valve
CA2580594A1 (en) Fuel manifold with reduced losses
JP2010255572A (en) Die device for molding throttle body semi-finished product
EP2733343A1 (en) Intake pipe structure for internal combustion engine
JP2010216412A (en) Fuel injection valve
JP2016160766A (en) Spacer
JP6549508B2 (en) Fuel injection valve
JP5968762B2 (en) PCV valve
JP6733999B2 (en) Fuel injection valve
CN111094733B (en) Leaf valve for an exhaust gas recirculation line