JP4711840B2 - Exhaust flow control valve in exhaust system of vehicle engine - Google Patents

Exhaust flow control valve in exhaust system of vehicle engine Download PDF

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JP4711840B2
JP4711840B2 JP2006022105A JP2006022105A JP4711840B2 JP 4711840 B2 JP4711840 B2 JP 4711840B2 JP 2006022105 A JP2006022105 A JP 2006022105A JP 2006022105 A JP2006022105 A JP 2006022105A JP 4711840 B2 JP4711840 B2 JP 4711840B2
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valve
exhaust
pipe
elastic member
inner pipe
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光 鈴木
昌毅 後藤
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Honda Motor Co Ltd
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Description

本発明は、車両、主として自動車に搭載されるエンジンの排気系における排気流量制御弁に関する。   The present invention relates to an exhaust flow control valve in an exhaust system of an engine mounted on a vehicle, mainly an automobile.

従来、エンジンの排気ガスが通る排気管に設けられ、排気管内の流路断面積を小さくする閉じ側と流路断面積を大きくする開き側とに切換わる開閉弁と、その開閉弁を閉じ側へ付勢する弾性部材とを備え、開閉弁に作用する排気ガス圧力の増加により、弾性部材の付勢力に抗して開閉弁を閉じ側から開き側へ切換えるようにした排気流量制御弁は公知（後記特許文献１参照）である。
米国特許第５，３５５，６７３号明細書 Conventionally, an on-off valve that is provided in an exhaust pipe through which exhaust gas of an engine passes and switches between a closed side that reduces the cross-sectional area of the flow path in the exhaust pipe and an open side that increases the cross-sectional area of the flow path; An exhaust flow control valve is known which has an elastic member that biases the valve to switch the open / close valve from the closed side to the open side against the biasing force of the elastic member by increasing the exhaust gas pressure acting on the open / close valve (See Patent Document 1 below).
US Pat. No. 5,355,673

ところで、前記特許文献１に開示されるものは、弾性部材、および弾性部材と開閉弁との間に介在するリンク機構を、排気管とこれを包囲する外管との間に配置して、弾性部材やリンク機構が直接排気ガスに曝されることによる熱害や、車両走行時の飛石などによる流量制御弁の損傷を防止するようにしている。   By the way, what is disclosed by said patent document 1 arrange | positions the elastic member and the link mechanism interposed between an elastic member and an on-off valve between an exhaust pipe and the outer pipe | tube surrounding this, and is elastic. Heat damage caused by direct exposure of the members and the link mechanism to the exhaust gas and damage to the flow control valve due to flying stones when the vehicle travels are prevented.

しかしながら、このものでは弾性部材やリンク機構を外管の側部と排気管との間に形成される比較的狭い空間に配置しているため、外管が地面や縁石などに強く接地して、外管の損傷がその側部にも及んだ場合には、弾性部材やリンク機構も損傷を受けるという問題があり、また、車両の走行中に飛散した飛石などが外管に衝突して、外管の損傷がその側部に及んだ場合にも弾性部材やリンク機構も損傷を受けるという問題もある。   However, in this case, since the elastic member and the link mechanism are arranged in a relatively narrow space formed between the side portion of the outer pipe and the exhaust pipe, the outer pipe is strongly grounded to the ground or curbstone, When damage to the outer tube reaches the side, there is a problem that the elastic member and the link mechanism are also damaged, and flying stones scattered during the running of the vehicle collide with the outer tube, There is also a problem that the elastic member and the link mechanism are also damaged when the outer tube is damaged to the side.

本発明はかかる実情に鑑みてなされたもので、前記問題をすべて解決できるようにした新規な車両用エンジンの排気系における排気流量制御弁を提供することを目的とする。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a novel exhaust flow control valve in an exhaust system of a vehicle engine that can solve all of the above problems.

上記目的を達成するため、請求項１記載の発明は、車両に搭載されたエンジンの排気系に介在されており、車両に支持される排気管に設けられる排気流量制御弁であって、排気管内に設けられる排気ガス通路の流路断面積を小さくする閉じ側と、その流路断面積を大きくする開き側とに切換わる開閉弁と、開閉弁を閉じ側に付勢する弾性部材とを備え、開閉弁に作用する排気ガス圧力の増加により、弾性部材の付勢力に抗して開閉弁を閉じ側から開き側へ切換えるようにしたものにおいて、 前記排気管は、排気ガス通路を設けた内管とその内管を包囲する外管と外管の上部と内管との間に形成される空間を備え、
前記内管は、その長手方向の中間部において、その上半部の断面積がその下半部の断面積よりも小さく形成されて、その上半部の一側に前記空間に通じる凹みが形成され、この凹みに前記弾性部材を配置し、
前記開閉弁の弁軸を、ブッシュを介して前記内管の上半部に揺動可能に支持し、前記弁軸に一体に形成したフランジを前記ブッシュにそれぞれ対向させ、前記弁軸および開閉弁が前記内管に当たらないようにした、ことを特徴としている。 In order to achieve the above object, an invention according to claim 1 is an exhaust flow control valve that is interposed in an exhaust system of an engine mounted on a vehicle and is provided in an exhaust pipe supported by the vehicle. An open / close valve that switches between a closed side that reduces the cross-sectional area of the exhaust gas passage provided in the open side, an open side that increases the cross-sectional area of the flow path, and an elastic member that biases the open / close valve toward the closed side. The on-off valve is switched from the closed side to the open side against the biasing force of the elastic member by increasing the exhaust gas pressure acting on the on-off valve. A space formed between the tube and the outer tube surrounding the inner tube, the upper portion of the outer tube and the inner tube ;
The inner tube is formed such that a cross-sectional area of its upper half is smaller than a cross-sectional area of its lower half in the middle part in the longitudinal direction, and a recess leading to the space is formed on one side of the upper half. The elastic member is disposed in the recess,
The valve shaft of the on-off valve is swingably supported on the upper half of the inner pipe via a bush, and flanges formed integrally with the valve shaft are opposed to the bush, respectively, and the valve shaft and the on-off valve Is characterized by not hitting the inner pipe .

また、上記目的を達成するため、請求項２記載の発明は、前記請求項１記載のものにおいて、前記弾性部材と前記開閉弁との間にリンク機構を介在させ、そのリンク機構を弾性部材と共に前記空間に配置したことを特徴としている。   In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, a link mechanism is interposed between the elastic member and the on-off valve, and the link mechanism is combined with the elastic member. It arrange | positions in the said space, It is characterized by the above-mentioned.

請求項１、２記載の発明によれば、排気管が地面や縁石などに強く接地した場合でも変形、損傷し難い外管の上部と、その内管との間に形成される凹みに弾性部材あるいは弾性部材およびリンク機構を配置したので、前記接地による弾性部材あるいは弾性部材およびリンク機構の損傷を前記従来のものに比べてより確実に防止できる。また、外管の上部は外管の側方に比べて飛石などの外乱を受けにくいので、外乱による損傷も一層確実に防止できる。 According to the first and second aspects of the present invention, the elastic member is formed in the recess formed between the upper part of the outer pipe and the inner pipe which is not easily deformed or damaged even when the exhaust pipe is strongly grounded to the ground or curb. Alternatively, since the elastic member and the link mechanism are arranged, damage to the elastic member or the elastic member and the link mechanism due to the grounding can be prevented more reliably than the conventional one. In addition, since the upper part of the outer tube is less susceptible to disturbances such as stepping stones compared to the side of the outer tube, damage due to the disturbance can be prevented more reliably.

また、弾性部材あるいは弾性部材およびリンク機構が外管の上部に配置されるので、排気ガス中に含まれる水蒸気が凝縮して内管内に溜まっている凝縮水が、内管と外管との間の空間に侵入してその空間内に滞留し、その状態で凍結した場合でも、その凍結水が排気流量制御弁の作動部に及ぶことがなく、該弁の作動が阻害されない。   Further, since the elastic member or the elastic member and the link mechanism are arranged at the upper part of the outer tube, the condensed water accumulated in the inner tube due to condensation of water vapor contained in the exhaust gas is between the inner tube and the outer tube. Even if it enters the space of the engine and stays in the space and freezes in that state, the frozen water does not reach the operating portion of the exhaust flow control valve, and the operation of the valve is not hindered.

また、開閉弁の弁軸がブッシュを介して内管の上半部に揺動可能に支持され、弁軸にはフランジが一体に形成され、これらのフランジをブッシュにそれぞれ対向させて、弁軸および開閉弁の軸方向の位置決めをすることができる。また、ブッシュは、開閉弁および弁軸が内管に当たらないようにしているので、開閉弁の開閉動作時に、異音が発生することを回避することができる。Further, the valve shaft of the on-off valve is swingably supported on the upper half of the inner pipe through the bush, and the valve shaft is integrally formed with a flange, and these flanges are respectively opposed to the bush to And the on-off valve can be positioned in the axial direction. Further, since the bush prevents the on-off valve and the valve shaft from hitting the inner pipe, it is possible to avoid the generation of noise during the on-off operation of the on-off valve.

以下、本発明の実施の形態を、添付図面に示した本発明の実施例に基づいて具体的に説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

図１〜６を参照して本発明の実施例について説明するに、この実施例は、本発明排気流量制御弁を自動車用エンジンの排気系に実施した場合であり、図１は、本発明排気流量制御弁を備えたエンジンの排気系の全体側面図、図２は、図１の２矢視の仮想線囲い部分の要部破断拡大図、図３は、図２の３矢視の要部破断図、図４は、排気流量制御弁の斜視図、図５は、図２の５−５線に沿う拡大断面図、図６は、図２の６−６線に沿う拡大断面図（開閉弁の正面図）である。   An embodiment of the present invention will be described with reference to FIGS. 1 to 6. This embodiment is a case where the exhaust flow control valve of the present invention is implemented in an exhaust system of an automobile engine. FIG. 2 is an overall side view of an exhaust system of an engine provided with a flow control valve, FIG. 2 is a fragmentary enlarged view of a portion surrounded by an imaginary line shown in FIG. 1, and FIG. 3 is a portion shown in FIG. 4 is a perspective view of the exhaust flow control valve, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 2, and FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. It is a front view of a valve.

図１において、自動車に搭載されるエンジンＥの排気ポートに接続されて、車両に支持される排気系Ｅｘは自動車の前後方向に沿って延びており、その上流側から下流側に沿って直下型排気触媒Ｃ、本発明にかかる排気流量制御弁Ｖを設けた排気管３、一次消音器（プリチャンバ）Ｍ１および二次消音器Ｍ２が順次に接続される。そして、エンジンＥの運転により、そこから排出された排気ガスは、直下型排気触媒Ｃにより排気ガス中の含まれるＨＣ、ＣＯ，ＮＯｘなどの有害成分が浄化されたのち、排気流量制御弁Ｖを経て、一次および二次消音器Ｍ１、Ｍ２により排気騒音が消音されて外部に排出される。   In FIG. 1, an exhaust system Ex connected to an exhaust port of an engine E mounted on a vehicle and supported by the vehicle extends along the front-rear direction of the vehicle, and is a direct type from the upstream side to the downstream side. An exhaust catalyst C, an exhaust pipe 3 provided with an exhaust flow rate control valve V according to the present invention, a primary silencer (pre-chamber) M1, and a secondary silencer M2 are sequentially connected. The exhaust gas discharged from the engine E after the operation is purified by the direct exhaust catalyst C to remove harmful components such as HC, CO and NOx contained in the exhaust gas, Then, the exhaust noise is silenced by the primary and secondary silencers M1 and M2 and discharged to the outside.

つぎに、図２〜５を参照して、本発明に従う排気流量制御弁Ｖの構成を具体的に説明する。   Next, the configuration of the exhaust flow control valve V according to the present invention will be specifically described with reference to FIGS.

この排気流量制御弁Ｖは、直下型触媒Ｃの出口に接続される上流側排気管１の下流端と、一次消音器Ｍ１の入口に接続される下流側排気管２の上流端との間に接続される排気管３に設けられており、この排気管３は、内管４と、この内管４を環状の空間６をあけて包囲する外管５とより構成されている。外管５の上流側はコーン状に形成されていて、内管４の上流側に接合され、この接合部には、上流側接続フランジ９に結合される接続パイプ８が挿嵌され、その接合部と接続パイプ８とは、気密に溶接１０されている。また、図２，３に示すように、外管５の下流側はへら絞り加工（スピニング加工）されていて、その下流端は、下流側接続フランジ１３に結合される接続パイプ１２に溶接１４されている。内管４の下流側は、外管５の下流側にステンレスメッシュのリング１５を介してフローティング支持されており、内管４の熱延びを吸収できるようにされている。   This exhaust flow control valve V is located between the downstream end of the upstream exhaust pipe 1 connected to the outlet of the direct type catalyst C and the upstream end of the downstream exhaust pipe 2 connected to the inlet of the primary silencer M1. The exhaust pipe 3 is provided with an inner pipe 4 and an outer pipe 5 surrounding the inner pipe 4 with an annular space 6 therebetween. The upstream side of the outer tube 5 is formed in a cone shape and is joined to the upstream side of the inner tube 4. A connection pipe 8 coupled to the upstream side connection flange 9 is inserted into this joint, and the joint is joined. The part and the connection pipe 8 are welded 10 in an airtight manner. As shown in FIGS. 2 and 3, the downstream side of the outer tube 5 is subjected to spatula drawing (spinning), and its downstream end is welded 14 to a connection pipe 12 coupled to the downstream connection flange 13. ing. The downstream side of the inner pipe 4 is floatingly supported on the downstream side of the outer pipe 5 via a stainless steel mesh ring 15 so that the thermal extension of the inner pipe 4 can be absorbed.

前記上流側接続フランジ９は、上流側排気管１の下流側接続フランジ１ｆに複数のボルト・ナットにより一体に結合され、また前記下流側接続フランジ１３は、下流側排気管２の上流側接続フランジ２ｆに複数のボルト・ナットにより一体に結合されている。   The upstream connection flange 9 is integrally coupled to the downstream connection flange 1 f of the upstream exhaust pipe 1 by a plurality of bolts and nuts, and the downstream connection flange 13 is an upstream connection flange of the downstream exhaust pipe 2. It is integrally connected to 2f by a plurality of bolts and nuts.

図５に最も明瞭に示すように、前記内管４は、縦方向に２分割される左、右分割半体４Ｌ，４Ｒを溶接１７して構成されており、この内管４の長手方向の中間部において、その上半部の一側には、空間６に通じる凹み１８が形成されており、これにより、内管４は、その上半部の断面積が、その下半部の断面積よりも小さくされている。内管４の、凹み１８を形成した上半部の左右対向面には、それぞれ外側に膨出する左右軸受孔１９Ｌ，１９Ｒが形成されており、これらの軸受孔１９Ｌ，１９Ｒには、ステンレスメッシュよりなる左右ブッシュ２０Ｌ，２０Ｒが同一軸線上で収容されており、これらのブッシュ２０Ｌ，２０Ｒに、開閉弁２２に溶接される弁軸２３が回転自在に貫通される。前記開閉弁２２の揺動支持部２２Ｓには、その弁幅を狭くする切り欠き２２Ｃが形成され、この開閉弁２２の揺動支持部２２Ｓは、断面積が小さくなった内管４の上半部に収容されていて、前記開閉弁２２の揺動支持部２２Ｓに溶接した前記弁軸２３が左右ブッシュ２０Ｌ，２０Ｒを介して内管４の上半部に揺動可能に支持される。弁軸２３の左右には、フランジ２３Ｆ，２３Ｆが一体に形成され、これらのフランジ２３Ｆ，２３Ｆを左右ブッシュ２０Ｌ，２０Ｒに対向させて、弁軸２３およびこれに溶接される開閉弁２２の軸方向の位置決めがなされる。また、ステンレスメッシュよりなる左右ブッシュ２０Ｌ，２０Ｒは、開閉弁２２および弁軸２３が内管４に直接当たらないようにしているので、開閉弁２２の開閉動作時に、異音が発生することが回避される。   As shown most clearly in FIG. 5, the inner tube 4 is formed by welding 17 left and right divided halves 4L and 4R which are divided into two in the longitudinal direction. In the middle part, a recess 18 that leads to the space 6 is formed on one side of the upper half part thereof, so that the inner tube 4 has a sectional area of the upper half part thereof and a sectional area of the lower half part thereof. Has been smaller than. Left and right bearing holes 19L and 19R bulging outward are formed on the left and right opposing surfaces of the upper half of the inner tube 4 where the recesses 18 are formed, and stainless steel mesh is formed in these bearing holes 19L and 19R. The left and right bushes 20L and 20R are accommodated on the same axis, and a valve shaft 23 welded to the on-off valve 22 is rotatably passed through the bushes 20L and 20R. The swing support portion 22S of the on-off valve 22 is formed with a notch 22C that narrows the valve width. The swing support portion 22S of the on-off valve 22 has an upper half of the inner pipe 4 having a reduced cross-sectional area. The valve shaft 23 which is accommodated in the portion and welded to the swing support portion 22S of the on-off valve 22 is swingably supported on the upper half of the inner tube 4 via the left and right bushes 20L and 20R. Flanges 23F, 23F are integrally formed on the left and right sides of the valve shaft 23. The flanges 23F, 23F are opposed to the left and right bushes 20L, 20R, and the axial direction of the valve shaft 23 and the on-off valve 22 welded thereto Is positioned. Further, the left and right bushes 20L and 20R made of stainless mesh prevent the on-off valve 22 and the valve shaft 23 from directly contacting the inner pipe 4, and therefore, it is possible to avoid the generation of noise during the on-off operation of the on-off valve 22. Is done.

図５、６に示すように、開閉弁２２は、幅狭に形成される揺動支持部２２Ｓと、幅広に形成されて、この開閉弁２２の主たる部分を構成する揺動主体部２２Ｍとより構成されており、揺動支持部２２Ｓには、前述のように前記弁軸２３が溶接されて内管４に揺動可能に支持され、また、揺動主体部２２Ｍは、内管４の流路断面積の大きい内管４の下半部にあって、その揺動先端部は開閉弁２２の開閉に伴い、内管４内の排気通路内周面との間に形成される流路断面積を大きく変化させる部分である。   As shown in FIGS. 5 and 6, the on-off valve 22 includes a swing support portion 22 </ b> S formed to be narrow, and a swing main body portion 22 </ b> M that is formed wide and constitutes a main portion of the on-off valve 22. As described above, the valve shaft 23 is welded to the swing support portion 22S and supported by the inner tube 4 so as to be swingable. The swing main portion 22M is connected to the flow of the inner tube 4. In the lower half of the inner pipe 4 having a large passage cross-sectional area, the rocking tip part is formed between the inner peripheral surface of the exhaust passage in the inner pipe 4 as the on-off valve 22 is opened and closed. This is the part that greatly changes the area.

図２、５、６に示すように、開閉弁２２の揺動主体部２２Ｍの背面、すなわち排気ガスの流れ方向下流側の面には錘４０が溶接されている、この錘４０は板状に形成されると共にその外周輪郭が、揺動主体部２２Ｍの外周輪郭と合うようにされている。また、この錘４０の上縁は、平坦に形成されていて開閉弁２２の、揺動支持部２２Ｓと揺動主体部２２Ｍとの境界部分に位置しており、開閉弁２２の背面との間に段差を形成している。しかして、この錘４０は、後に述べるように開閉弁の振動防止作用の外に開閉弁２２と協働して開閉弁２２の背面側に発生する排気ガスの乱流の抑制機能を有している。   As shown in FIGS. 2, 5 and 6, a weight 40 is welded to the back surface of the swinging main portion 22M of the on-off valve 22, that is, the downstream surface in the exhaust gas flow direction. The outer peripheral contour is formed so as to match the outer peripheral contour of the swing main body 22M. The upper edge of the weight 40 is formed flat and is located at the boundary between the swing support portion 22S and the swing main portion 22M of the on-off valve 22, and between the back surface of the on-off valve 22 Have a step. As described later, the weight 40 has a function of suppressing turbulence of exhaust gas generated on the back side of the on-off valve 22 in cooperation with the on-off valve 22 in addition to the action of preventing the on-off valve vibration. Yes.

図２〜５に示すように、内管４の上部に形成した空間６の凹み１８には、前記開閉弁２２を閉じ側、すなわち内管４内の排気ガスの通路面積を小さくする側に付勢する弾性部材２６が設けられる。この弾性部材２６は、この実施例では、ねじりコイルばねにより構成されており、このねじりコイルばね２６は、内管４の壁面から凹み１８に向けて片持ち状に溶接した断面Ｃ字状の支持部材２７に嵌込み支持されている。ねじりコイルばね２６は、その軸方向の一端より固定側アーム２６ａが延びており、また、その他端より可動側アーム２６ｂが延びている。内管４には固定部材２８が溶接されている。この固定部材２８は、複数（３つ）の係止部２８Ａ，２８Ｂ，２８Ｃが列設されて櫛歯状に形成されており、ねじりコイルばね２６の一端は、それらの係止部２８Ａ，２８Ｂ，２８Ｃの一つに選択的に係止される。これにより、ねじりコイルばね２６のばね特性が変えられるようにしてある。また、ねじりコイルばね２６の固定側アーム２６ｂは、リンク機構３０を介して前記開閉弁２２に連結されている。前記リンク機構３０は、前記空間６の凹み１８内に収容されるステー３１を備えており、このステー３１は、その基端にボス部３１ａを、その先端にフック部３１ｂを有しており、そのボス部３１ａが弁軸２３に嵌合、溶接され、また、そのフック部３１ｂが、前記ねじりコイルばね２６の可動側アーム２６ｂに設けた連結子３３に係脱可能に係合されている。図５に示すように、前記連結子３３は筒状のカーボンブッシュにより構成されている。   As shown in FIGS. 2 to 5, a recess 18 in the space 6 formed in the upper part of the inner pipe 4 is attached to the side on which the on-off valve 22 is closed, that is, the passage area of the exhaust gas in the inner pipe 4 is reduced. A resilient elastic member 26 is provided. In this embodiment, the elastic member 26 is constituted by a torsion coil spring, and this torsion coil spring 26 is supported in a cantilevered manner from the wall surface of the inner tube 4 toward the recess 18. The member 27 is fitted and supported. The torsion coil spring 26 has a fixed arm 26a extending from one end in the axial direction, and a movable arm 26b extending from the other end. A fixing member 28 is welded to the inner tube 4. The fixing member 28 has a plurality of (three) locking portions 28A, 28B, 28C arranged in a comb shape, and one end of the torsion coil spring 26 has the locking portions 28A, 28B. , 28C is selectively locked. Thereby, the spring characteristic of the torsion coil spring 26 can be changed. The stationary arm 26 b of the torsion coil spring 26 is connected to the on-off valve 22 via a link mechanism 30. The link mechanism 30 includes a stay 31 accommodated in the recess 18 of the space 6, and the stay 31 has a boss portion 31a at the base end and a hook portion 31b at the tip end. The boss portion 31a is fitted and welded to the valve shaft 23, and the hook portion 31b is detachably engaged with a connector 33 provided on the movable arm 26b of the torsion coil spring 26. As shown in FIG. 5, the connector 33 is formed of a cylindrical carbon bush.

図２に実線で示すように、ねじりコイルばね２６の弾発力は、連結子３３をステー３１の先端のフック部３１ｂに弾発係合させ、ステー３１を時計方向（図２矢印ａ方向）へ回動させて、錘４０を取付けた開閉弁２２を閉じ側へ付勢し、該開閉弁２２を閉じ側へ切換えるようにしている。そして、開閉弁２２が閉じ側に切換えられた状態では、内管４内には、エンジンＥのアイドリング運転、始動運転時などの低速運転に応じた狭い排気ガスの通路断面積が形成される。また、内管４を流れる排気ガスの排気圧力が、ねじりコイルばね２６の弾発力よりも大きくなるにつれて、開閉弁２２は反時計方向（図２矢印ｂ）すなわち開き側へ切換られる。このとき、連結子３３は、図２鎖線に示すように、フック部３１ｂ側からボス部３１ａ側へとスライド移動する。そして、ねじりコイルばね２６の弾発力と、排気ガスの排気圧力とがバランスしたところで、開閉弁２２は所定の開度に安定よく維持され、その開閉弁２２が排気圧力変動をうけてばたつくことがない。   As indicated by a solid line in FIG. 2, the elastic force of the torsion coil spring 26 causes the connector 33 to elastically engage the hook portion 31b at the tip of the stay 31, and the stay 31 is rotated in the clockwise direction (the direction of arrow a in FIG. 2). And the on-off valve 22 to which the weight 40 is attached is urged toward the closing side, so that the on-off valve 22 is switched to the closing side. When the on-off valve 22 is switched to the closed side, a narrow exhaust gas passage cross-sectional area is formed in the inner pipe 4 according to low speed operation such as idling operation or start operation of the engine E. Further, as the exhaust pressure of the exhaust gas flowing through the inner pipe 4 becomes larger than the resilience of the torsion coil spring 26, the on-off valve 22 is switched counterclockwise (arrow b in FIG. 2), that is, opened. At this time, the connector 33 slides from the hook portion 31b side to the boss portion 31a side as shown in FIG. When the elastic force of the torsion coil spring 26 and the exhaust pressure of the exhaust gas are balanced, the on-off valve 22 is stably maintained at a predetermined opening, and the on-off valve 22 fluctuates due to fluctuations in the exhaust pressure. There is no.

つぎに、この実施例の作用について説明する。   Next, the operation of this embodiment will be described.

図１に示すように、排気系Ｅｘに接続される排気管３は、その長手方向が自動車の前後方向に沿うようにして車両に支持されており、この支持状態でねじりコイルばね２６およびリンク機構３０は、外管５の上部と内管４との間に形成される空間６に配置される。   As shown in FIG. 1, the exhaust pipe 3 connected to the exhaust system Ex is supported by the vehicle such that the longitudinal direction thereof is along the longitudinal direction of the automobile. In this supported state, the torsion coil spring 26 and the link mechanism are supported. 30 is arranged in a space 6 formed between the upper part of the outer tube 5 and the inner tube 4.

いま、エンジンＥが運転されると、そこから排出される排気ガスは排気系Ｅｘへと流れる。排気系Ｅｘを流れる排気ガスは、直下型排気触媒Ｃへと流れ、排気ガス中の含まれるＨＣ、ＣＯ、ＮＯｘなどの有害成分が浄化されたのち、本発明にかかる排気流量制御弁Ｖを経て排気ガス流量が制御されたのち、一次および二次消音器Ｍ１、Ｍ２へと流れ、排気音が順次に消音されて外部に排出される。   Now, when the engine E is operated, the exhaust gas discharged from the engine E flows into the exhaust system Ex. The exhaust gas flowing through the exhaust system Ex flows to the direct type exhaust catalyst C, and after harmful components such as HC, CO, NOx contained in the exhaust gas are purified, the exhaust gas passes through the exhaust flow control valve V according to the present invention. After the flow rate of the exhaust gas is controlled, the exhaust gas flows to the primary and secondary silencers M1 and M2, and the exhaust sound is silenced sequentially and discharged to the outside.

エンジンＥのアイドリング運転、始動運転を含む低速運転域では、エンジンＥの燃焼圧力が低く、そこから排出される排気ガスの排気圧力も低いため、排気管３内に流入する排気ガス動圧も低く、開閉弁２２は、図２に実線に示すように、閉じ側に保持されていて、内管４内の排気ガス通路面積を最も絞っているので、排気エネルギを減少させて、一次消音器Ｍ１の手前にて排気騒音を予備的に消音させると共にエンジンＥの充填効率が高められる。   In the low speed operation region including the idling operation and start operation of the engine E, the combustion pressure of the engine E is low and the exhaust gas exhaust pressure discharged from the engine E is low, so the exhaust gas dynamic pressure flowing into the exhaust pipe 3 is also low. As shown by the solid line in FIG. 2, the on-off valve 22 is held on the closed side, and the exhaust gas passage area in the inner pipe 4 is most restricted, so that the exhaust energy is reduced and the primary silencer M1. The exhaust noise is preliminarily silenced before the engine speed and the charging efficiency of the engine E is increased.

一方、エンジンＥの燃焼が完爆状態となって、その回転数が高速運転域に達すると、その燃焼圧力も高くなり、そこから排出される排気ガスの圧力も高くなるため、内管４内に流入した排気ガス動圧は、図２に鎖線に示すように、開閉弁２２を弾性部材すなわちねじりコイルばね２６の弾発力に抗して開閉弁２２を開き側へ切換えるに至り、該排気管３内の排気通路の通路断面積を大きくし、エンジンＥの高速回転域での排気圧力損失の低減を図ることができる。   On the other hand, when the combustion of the engine E is in a complete explosion state and the rotational speed reaches the high speed operation range, the combustion pressure also increases, and the pressure of the exhaust gas exhausted therefrom also increases. The exhaust gas dynamic pressure that has flowed into the valve switches the open / close valve 22 to the open side against the elastic force of the elastic member, that is, the torsion coil spring 26, as shown by the chain line in FIG. The passage cross-sectional area of the exhaust passage in the pipe 3 can be increased to reduce the exhaust pressure loss in the high speed rotation region of the engine E.

ところで、排気管３が、地面の***部や縁石などに強く接地した場合に、前記開閉弁２２の作動部である、ねじりコイルばね２６およびリンク機構３０は排気管３の外管５の上部と内管４との間に形成される空間６に配置されているので、排気管３の前記接地により外管５の下部が変形することがあっても、前記ねじりコイルばね２６やリンク機構３０が損傷することがなく、開閉弁２２が作動不良を生起することがない。また、車両の走行により、飛石などが排気管３の下部に衝突することがあっても、ねじりコイルばね２６やリンク機構３０を損傷することがない。   By the way, when the exhaust pipe 3 is strongly grounded to the raised portion of the ground, a curbstone, or the like, the torsion coil spring 26 and the link mechanism 30 which are the operation parts of the on-off valve 22 are connected to the upper part of the outer pipe 5 of the exhaust pipe 3. Since the lower part of the outer pipe 5 may be deformed by the grounding of the exhaust pipe 3, the torsion coil spring 26 and the link mechanism 30 are disposed in the space 6 formed between the inner pipe 4 and the inner pipe 4. There is no damage, and the on-off valve 22 does not malfunction. Further, even if a stepping stone or the like collides with the lower portion of the exhaust pipe 3 due to traveling of the vehicle, the torsion coil spring 26 and the link mechanism 30 are not damaged.

また、排気ガス中に含まれる水蒸気が凝縮して、これが内管４内に凝縮水として溜まり、この凝縮水が、内管４の熱延びを吸収する吸収部材であるステンレスメッシュリング１５や２分割構造の内管４の溶接１７部などを通して、内管４と外管５との間の空間６に侵入して、その下部に溜まり凍結することがあっても、その凍結水が、ねじりコイルばね２６やリンク機構３０に付着することが防止されて、開閉弁２２の作動を阻害することがない。   Further, water vapor contained in the exhaust gas condenses and accumulates as condensed water in the inner tube 4, and this condensed water is a stainless mesh ring 15 that is an absorbing member that absorbs the thermal extension of the inner tube 4 and is divided into two parts. Even if the inner pipe 4 of the structure is penetrated into the space 6 between the inner pipe 4 and the outer pipe 5 through the weld 17 or the like, the frozen water stays in the lower part and freezes. 26 and the link mechanism 30 is prevented, and the operation of the on-off valve 22 is not hindered.

なお、エンジンＥの低速運転域において、開閉弁２２が開いたときに従来の開閉弁では開閉弁２２の背面（排気ガスの流れ方向下流側の面）に排気ガスが回り込む乱流を生じ易くなり、これに起因して排気ガスの流量を減少させて背圧を増加させ、エンジンの出力を低下させる原因となるが、この実施例のものでは、開閉弁２２の揺動主体部２２Ｍの背面に錘４０を取付け、この錘４０の外周輪郭を、開閉弁２２の揺動主体部２２Ｍの外周輪郭に合わせたことにより、錘４０により開閉弁２２の振動を低減しながら、開閉弁２２の揺動主体部２２Ｍの揺動先端部の厚さを実質的に増加させることができ、開閉弁２２の外周縁と排気通路の内周面間を流れる排気ガスに整流作用を生じさせるようになり、これにより、開閉弁２２の背面に回り込む乱流が減り、排気ガス流量の減少による背圧増加とこれに起因するエンジンの出力の低下が防止される。また、錘４０を開閉弁２２の揺動主体部２２Ｍの背面に溶接したことにより、排気ガスが直接錘４０の溶接部に噴射されることがなく、その溶接剥がれが防止される。   In the low-speed operation region of the engine E, when the on-off valve 22 is opened, the conventional on-off valve tends to generate a turbulent flow in which the exhaust gas flows around the back surface of the on-off valve 22 (the surface on the downstream side in the exhaust gas flow direction). As a result, the flow rate of the exhaust gas is decreased to increase the back pressure and the output of the engine is decreased. In this embodiment, the back surface of the swing main body 22M of the on-off valve 22 is reduced. The weight 40 is attached, and the outer contour of the weight 40 is matched with the outer contour of the swing main portion 22M of the on-off valve 22, so that the on-off valve 22 is swung while the weight 40 reduces the vibration of the on-off valve 22. The thickness of the rocking tip of the main portion 22M can be substantially increased, and the exhaust gas flowing between the outer peripheral edge of the on-off valve 22 and the inner peripheral surface of the exhaust passage has a rectifying action. Wraps around the back of the on-off valve 22 Reduces turbulence, decrease in the output of the engine due to the back pressure increase due to a decrease in the exhaust gas flow rate is prevented. Further, since the weight 40 is welded to the back surface of the swinging main portion 22M of the on-off valve 22, the exhaust gas is not directly injected to the welded portion of the weight 40, and the welding peeling is prevented.

また、この実施例のものでは、開閉弁２２に切り欠き２２Ｃを形成すると共に内管４の上部ににその切り欠き２２Ｃに合わせた凹み１８を形成し、その凹み１８と外管５との間に形成される空間に、開閉弁２２を閉じ方向に付勢する弾性部材２６を配置したので、その弾性部材２６や、この弾性部材２６と開閉弁２２を連結するリンク機構３０を配置するための空間を径方向に拡大することができ、前記弾性部材２６やリンク機構３０を径方向に対して薄型に形成するなどの制約を受けることがなくなる。したがって、開閉弁２２の作動特性の設定自由度が増して、排気流量制御弁Ｖの性能を大幅に向上させることができ、しかも排気管３は、その外管５の径を大きくする必要がないため、排気系Ｅｘの排気流量制御弁Ｖを設ける部分の排気構造の大型化を招くことがなく、全体として、排気系Ｅｘの軽量化、小型化が可能になる。   Further, in this embodiment, a notch 22C is formed in the on-off valve 22 and a recess 18 corresponding to the notch 22C is formed in the upper part of the inner tube 4, and the gap between the recess 18 and the outer tube 5 is formed. Since the elastic member 26 that urges the opening / closing valve 22 in the closing direction is disposed in the space formed in the above, the elastic member 26 and the link mechanism 30 that connects the elastic member 26 and the opening / closing valve 22 are disposed. The space can be expanded in the radial direction, and the elastic member 26 and the link mechanism 30 are not restricted by being formed thin in the radial direction. Accordingly, the degree of freedom in setting the operating characteristics of the on-off valve 22 can be increased, and the performance of the exhaust flow control valve V can be greatly improved. Moreover, the exhaust pipe 3 does not need to have a larger diameter of the outer pipe 5. Therefore, the exhaust structure at the portion where the exhaust flow rate control valve V of the exhaust system Ex is provided is not increased in size, and the exhaust system Ex can be reduced in weight and size as a whole.

以上、本発明の実施例について説明したが、本発明はその実施例に限定されることなく、本発明の範囲内で種々の実施例が可能である。   As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

たとえば、前記実施例では、本発明にかかる排気流量制御弁Ｖを直下型触媒Ｃと一次消音器Ｍ１との間に設けているいが、これを排気系Ｅｘの他の箇所に設けてもよい。また、前記実施例では、排気管３は断面円形に形成されるが、これを断面楕円形その他の形状に形成してもよい。   For example, in the above embodiment, the exhaust flow rate control valve V according to the present invention is provided between the direct type catalyst C and the primary silencer M1, but this may be provided at other locations of the exhaust system Ex. Moreover, in the said Example, although the exhaust pipe 3 is formed in a cross-sectional circle shape, this may be formed in a cross-sectional ellipse shape.

本発明排気流量制御弁を備えたエンジンの排気系の全体側面図Overall side view of an exhaust system of an engine equipped with an exhaust flow control valve of the present invention 図１の２矢視の仮想線囲い部分の要部破断拡大図FIG. 1 is a fragmentary enlarged view of the imaginary line encircled portion indicated by the arrow 2 in FIG. 図２の３矢視の要部破断図FIG. 排気流量制御弁の斜視図Perspective view of exhaust flow control valve 図２の５−５線に沿う拡大断面図Enlarged sectional view taken along line 5-5 in FIG. 図２の６−６線に沿う拡大断面図（開閉弁の正面図）2 is an enlarged sectional view taken along line 6-6 in FIG. 2 (front view of the on-off valve).

３・・・・・・・・・排気管
４・・・・・・・・・内管
５・・・・・・・・・外管
６・・・・・・・・・空間
１８・・・・・・・・・凹み
２０Ｌ・・・・・・・・ブッシュ（左ブッシュ）
２０Ｒ・・・・・・・・ブッシュ（右ブッシュ）
２２・・・・・・・・・開閉弁
２３・・・・・・・・・弁軸
２３Ｆ・・・・・・・・フランジ
２６・・・・・・・・・弾性部材（ねじりコイルばね）
３０・・・・・・・・・リンク機構
Ｅ・・・・・・・・・・エンジン
Ｅｘ・・・・・・・・・排気系 3 .... Exhaust pipe 4 .... Inner pipe 5 .... Outer pipe
6 ... Space
18 ..... depression
20L ・ ・ ・ ・ ・ ・ ・ ・ Bush (Left bush)
20R: Bush (right bush)
22 .... Open / close valve
23 ... Valve shaft
23F: Flange 26: Elastic member (torsion coil spring)
30 ... Link mechanism E Engine Ex ... Exhaust system

Claims (2)

車両に搭載されたエンジン（Ｅ）の排気系（Ｅｘ）に介在されており、車両に支持される排気管（３）に設けられる排気流量制御弁であって、
排気管（３）内に設けられる排気ガス通路の流路断面積を小さくする閉じ側と、その流路断面積を大きくする開き側とに切換わる開閉弁（２２）と、
開閉弁（２２）を閉じ側に付勢する弾性部材（２６）とを備え、
開閉弁（２２）に作用する排気ガス圧力の増加により、弾性部材（２６）の付勢力に抗して開閉弁（２２）を閉じ側から開き側へ切換えるようにしたものにおいて、
前記排気管（３）は、排気ガス通路を設けた内管（４）とその内管（４）を包囲する外管（５）と外管（５）の上部と内管（４）との間に形成される空間（６）を備え、
前記内管（４）は、その長手方向の中間部において、その上半部の断面積がその下半部の断面積よりも小さく形成されて、その上半部の一側に前記空間（６）に通じる凹み（１８）が形成され、この凹み（１８）に前記弾性部材（２６）を配置し、
前記開閉弁（２２）の弁軸（２３）を、ブッシュ（２０Ｌ，２０Ｒ）を介して前記内管（４）の上半部に揺動可能に支持し、前記弁軸（２３）に一体に形成したフランジ（２３Ｆ，２３Ｆ）を前記ブッシュ（２０Ｌ，２０Ｒ）にそれぞれ対向させ、前記弁軸（２３）が前記内管（４）に当たらないようにしたことを特徴とする、車両用エンジンの排気系における排気流量制御弁。 An exhaust flow rate control valve that is interposed in an exhaust system (Ex) of an engine (E) mounted on a vehicle and is provided in an exhaust pipe (3) supported by the vehicle,
An on-off valve (22) that switches between a closed side for reducing the flow passage cross-sectional area of the exhaust gas passage provided in the exhaust pipe (3) and an open side for increasing the flow passage cross-sectional area;
An elastic member (26) for biasing the on-off valve (22) toward the closing side,
In the configuration in which the on-off valve (22) is switched from the closed side to the open side against the biasing force of the elastic member (26) by increasing the exhaust gas pressure acting on the on-off valve (22).
The exhaust pipe (3) includes an inner pipe (4) provided with an exhaust gas passage, an outer pipe (5) surrounding the inner pipe (4), an upper portion of the outer pipe (5), and an inner pipe (4). A space (6) formed between ,
The inner pipe (4) is formed so that the cross-sectional area of its upper half is smaller than the cross-sectional area of its lower half in the middle part in the longitudinal direction, and the space (6 ) (18) that leads to), and the elastic member (26) is disposed in this dent (18),
The valve shaft (23) of the on-off valve (22) is swingably supported on the upper half of the inner pipe (4) via bushes (20L, 20R), and integrated with the valve shaft (23). The formed flange (23F, 23F) is opposed to the bush (20L, 20R), respectively, so that the valve shaft (23) does not hit the inner pipe (4) . Exhaust flow control valve in the exhaust system. 前記弾性部材（２６）と前記開閉弁（２２）との間にリンク機構（３０）を介在させ、そのリンク機構（３０）を弾性部材（２６）と共に前記凹み（１８）に配置したことを特徴とする、前記請求項１記載の車両用エンジンの排気系における排気流量制御弁。 A link mechanism (30) is interposed between the elastic member (26) and the on-off valve (22), and the link mechanism (30) is disposed in the recess (18) together with the elastic member (26). The exhaust flow control valve in the exhaust system of the vehicle engine according to claim 1.
JP2006022105A 2006-01-31 2006-01-31 Exhaust flow control valve in exhaust system of vehicle engine Expired - Fee Related JP4711840B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10619552B2 (en) 2017-09-13 2020-04-14 Hyundai Motor Company Coolant control valve unit having holder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355673A (en) * 1992-11-18 1994-10-18 Sterling Robert E Exhaust valve
JPH10141040A (en) * 1996-11-14 1998-05-26 Umex:Kk Noise eliminator for internal combustion engine
JP2000257418A (en) * 1999-03-05 2000-09-19 Sango Co Ltd Exhaust silencer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355673A (en) * 1992-11-18 1994-10-18 Sterling Robert E Exhaust valve
JPH10141040A (en) * 1996-11-14 1998-05-26 Umex:Kk Noise eliminator for internal combustion engine
JP2000257418A (en) * 1999-03-05 2000-09-19 Sango Co Ltd Exhaust silencer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10619552B2 (en) 2017-09-13 2020-04-14 Hyundai Motor Company Coolant control valve unit having holder

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