JP3676128B2

JP3676128B2 - Valve unit for silencer

Info

Publication number: JP3676128B2
Application number: JP19156799A
Authority: JP
Inventors: 正之上兼; 哲史渡辺
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1999-07-06
Filing date: 1999-07-06
Publication date: 2005-07-27
Anticipated expiration: 2019-07-06
Also published as: JP2001020718A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として車両用エンジンの排気系に介設する消音器用のバルブ装置に関し、更に詳細には、消音器内の排気ガスのバイパス経路を排気圧が所定圧に上昇したときに開くバルブ装置に関する。
【０００２】
【従来の技術】
本願出願人は、先に、この種のバルブ装置として、特願平１０−１１０５８０号により、排気ガスが流通する弁孔を有するハウジングと、弁孔を開閉するバルブとを備え、バルブを弾性的に撓み変形可能で一端部をハウジングに固定した板状弁で構成し、板状弁を固定したハウジング面の弁孔の周縁に設けた弁座部に、板状弁が自己の撓み変形による弾性復元力で閉じ側に付勢された状態で着座させられ、この弾性復元力を上回る排気圧が板状弁に作用したときに板状弁が開き側に撓んで弁孔が開かれるようにしたものや、特願平１０−１７７４１４号により、角パイプを輪切りにしてハウジングを形成し、この角パイプ製ハウジングの一方の開口端の一辺部分を切り起こしてバルブ固定部を形成すると共に、これに板状弁をねじ止めし、ハウジングのバルブ固定部以外のパイプ壁で板状弁を囲う囲い壁を構成して、板状弁が着座する弁座を省略したものを提案している。
【０００３】
【発明が解決しようとする課題】
上記従来例のものでは、排気ガス流によって開閉させられる板状弁に開閉振動が生じるが、この開閉振動数が単一部材で形成される板状弁の固有振動数と一致すると板状弁が共振することになる。この板状弁の共振は、板状弁の撓み変形、即ち、バルブの開度が大きくなると強くなってしまう。従って、エンジンの馬力アップを図るために、バルブの最大開度を大きくしたくても、要求通りに開度を設定できなくなる。
【０００４】
本発明は、以上の点に鑑み、板状弁の共振を抑制し得るようにした消音器用バルブ装置を提供することを課題としている。
【０００５】
【課題を解決するための手段】
上記課題を解決すべく、本発明では、消音器内の排気ガスのバイパス経路を排気圧が所定圧に上昇したときに開くバルブ装置であって、排気ガスが流通する弁孔を有するハウジングと、弁孔を開閉するバルブとを備え、バルブを弾性的に撓み変形可能で一端部をハウジングに固定した板状弁で構成するものにおいて、該板状弁を複数の薄板部材による積層構造とし、板状弁の撓み変形でこれら薄板部材相互の摩擦が生じるようにしている。
【０００６】
これによれば、板状弁の開閉振動により構成部材である複数の各薄板部材も同じ開閉振動を繰り返すが、この際、対向する薄板部材間に摩擦による摩擦熱が生じて、開閉振動のエネルギーが熱エネルギーとして放散されるため、板状弁の振動増幅を防止することができる。
【０００７】
また、板状弁の共振をより効果的に抑制するには、各薄板部材の固有振動数を互に相違させることが望まれ、それには各薄板部材の板厚や面積や長さを互に相違させれば良い。ここで、弁座に板状弁が着座するタイプのバルブ装置では、板状弁が弁座を叩くため、板状弁の耐久性を確保する上で、弁座側、即ち、排気ガス流の上流側に位置する薄板部材の板厚を、下流側に位置する薄板部材の板厚に比較して厚くすることが望ましい。また、排気ガス流の上流側に位置する薄板部材の面積を、下流側に位置する薄板部材の面積に比較して大きくし、板状弁の外周面に段差を形成すれば、板状弁の開弁時に前記段差への排気ガス流の巻き込みで上流側の薄板部材を下流側の薄板部材に押し付ける力が発生し、薄板部材間の摩擦力が増加して振動減衰特性が向上する。
【０００８】
【発明の実施の形態】
図１を参照して、１は内燃機関の排気系の途中に介設される消音器であり、筒状のシェル１１と、シェル１１の一端と他端とを閉塞する端壁１２、１３とで構成される消音器本体内に、第１と第２の１対のセパレータ１４、１５を設け、本体内の空間を、一端壁１２と第１セパレータ１４との間の第１消音室３１と、第１セパレータ１４と第２セパレータ１５との間の第２消音室３２と、第２セパレータ１５と他端壁１３との間の第３消音室３３とに区劃している。更に、消音器１に、一端壁１２と第１セパレータ１４と第２セパレータ１５とを夫々貫通して第３消音室３３と連通する排気流入管２１と、第２セパレータ１５と第１セパレータ１４とを夫々貫通して第３消音室３３と第１消音室３１とを連通するインナーパイプ２２と、第１セパレータ１４と第２セパレータ１５と他端壁１３とを夫々貫通して第１消音室３１を大気に連通させる排気流出管２３とを設けている。
【０００９】
そして、排気流入管２１の第２消音室３２部分の管壁に多数の透孔２１ａを穿設すると共に、インナーパイプ２２の第２消音室３２部分の管壁にも多数の透孔２２ａを穿設して、排気流入管２１とインナーパイプ２２とを第２消音室３２を介して連通できる構造とする。
【００１０】
これによれば、排気流入管２１に流入した排気ガスの流通経路は、第３消音室３３とインナーパイプ２２と第１消音室３１とを介して排気流出管２３に至る経路と、透孔２１ａと第２消音室３２と透孔２２ａとインナーパイプ２２と第１消音室３１とを介して排気流出管２３に至る経路との２系統になる。
【００１１】
ところで、内燃機関の高速回転に伴って多量の排気ガスが排気流入管２１に流入すると、上記２系統だけの排気ガスの流通経路では消音室３２，３３内の排気圧が高く成り、ひいては、内燃機関の出力が低下する。
【００１２】
このため、第１セパレータ１４に、第２消音室３２と第１消音室３１とを連通させるバイパス経路用の開口部１４ａを設け、この開口部１４ａに、排気圧が所定圧に上昇したときにバイパス経路を開くバルブ装置４を設け、内燃機関の高回転域では、上記した２系統にバイパス経路を追加した３系統の流通経路で多量の排気ガスが大気にスムーズに排出されるようにしている。
【００１３】
バルブ装置４は、図２に示すように、弁孔４１を有するハウジング４２と、弁孔４１を開閉するバルブたる、弾性的に撓み変形可能な板状弁４３とを備えており、ハウジング４２を第１セパレータ１４に弁孔４１が前記開口部１４ａに合致するようにねじ４４止めしている。
【００１４】
ハウジング４２は、鍛造または鋳造品から成る角形部材で形成され、その中央部に弁孔４１を設け、排気ガス流出側の側面には弁孔４１に隣接するバルブ固定部４２ｂと弁孔４１を開口させた弁座部４２ａとを形成している。この弁座部４２ａは、バルブ固定部４２ｂ側からバルブ固定部４２ｂに対向する側に向けて曲率半径を徐々に大きくしつつ立ち上がる凹曲面に形成されている。そして、板状弁４３の一端部４３ａを、板状弁４３の開き側への撓みを規制する板状のストッパ部材４６と共にねじ４５でハウジング４２のバルブ固定部４２ｂに共締めし、ストッパ部材４６により板状弁４３が開き側に過度に撓むことを防止している。
【００１５】
板状弁４３は、排気ガス流の上流側に位置する第１薄板部材４３Ａと、下流側に位置する第２薄板部材４３Ｂとの積層構造であり、両薄板部材４３Ａ、４３Ｂの相互の結合箇所をねじ４５による一端部４３ａのみとし、板状弁４３の撓み変形で両薄板部材４３Ａ、４３Ｂの相互の摩擦を生ずるようにしている。板状弁４３は撓み変形した状態で上流側の第１薄板部材４３Ａにおいて弁座部４２ａに着座して弁孔４１を閉塞し、この状態において、板状弁４３は自己の撓み変形による弾性復元力で閉じ側に付勢されることになる。そして、第２消音室３２内の排気圧が板状弁４３の弾性復元力に相当する所定圧以上になったとき、板状弁４３が開き側に撓み、弁孔４１が開かれてバイパス経路に排気ガスが流れる。ここで、排気圧の変動により板状弁４３が開閉振動すると、第１と第２の両薄板部材４３Ａ、４３Ｂ間の摩擦を生じ、開閉振動のエネルギーが熱エネルギーとして放散され、そのため、板状弁４３の振動増幅が抑制されて共振が防止される。
【００１６】
また、板状弁４３の共振をより効果的に防止するには、第１と第２の両薄板部材４３Ａ、４３Ｂの固有振動数を互に相違させることが望まれる。そこで、本実施形態では、第１薄板部材４３Ａの板厚ｔ1を例えば０．１５ｍｍ、第２薄板部材４３Ｂの板厚ｔ2を例えば０．１ｍｍにして、ｔ1＞ｔ2になるように設定している。これによれば、両薄板部材４３Ａ、４３Ｂの固有振動数に差を付けて、板状弁４３の共振を効果的に抑制できると共に、弁座部４２ａを叩く第１薄板部材４３Ａの耐久性、ひいては板状弁４３の耐久性を向上できる。
【００１７】
図３はバルブ装置４の第２実施形態を示しており、図２に示した第１実施形態と同一の部材には同一の符号を付している。この第２実施形態では、図３（Ａ）や図３（Ｂ）に示す如く、上流側に位置する第１薄板部材４３Ａの面積を、下流側に位置する第２薄板部材４３Ｂの面積に比較して大きくし、板状弁４３の一端部４３ａ側を除く外周面に、図３（Ｃ）に示す如く、所定幅Ｗ（例えば１．５ｍｍ）の段差４３ｂを形成している。これによれば、板状弁４３の開弁時に排気ガス流が段差４３ｂ部分に巻き込まれて、第１薄板部材４３Ａを第２薄板部材４３Ｂに押し付ける力が発生し、第１と第２の両薄板部材４３Ａ，４３Ｂ間の摩擦力が増加して振動減衰特性が向上する。
【００１８】
図４はバルブ装置４の第３実施形態を示している。この第３実施形態のバルブ装置４のハウジング４０２は、内周空間を弁孔４０１とする角パイプ状に形成されており、このハウジング４０２の一方の開口端の一辺部分を切り起こしてバルブ固定部４０２ｂを形成し、これに板状弁４０３の一端部４０３ａ及びストッパ部材４０６をねじ４０５で共締めし、ハウジング４０２のバルブ固定部４０２ｂ以外のパイプ壁で板状弁４０３を囲う囲い壁４０２ａを構成している。
【００１９】
この板状弁４０３は、第１乃至第３の３枚の薄板部材４０３Ａ、４０３Ｂ、４０３Ｃを一端部４０３ａのみで結合して積層して成るもので、第１薄板部材４０３Ａを弁孔４０１に略合致する大きさとし、一端部４０３ａから他端部までの長さを第１薄板部材４０３Ａ、第２薄板部材４０３Ｂ、第３薄板部材４０３Ｃの順に短くし、排気ガス流の上流側から下流側に向けて第１薄板部材４０３Ａ、第２薄板部材４０３Ｂ、第３薄板部材４０３Ｃの順に積層している。これによれば、板状弁４０３が下流側に撓む際にこれら薄板部材４０３Ａ、４０３Ｂ、４０３Ｃ間の摩擦を生じて振動が減衰される。また、板状弁４０３の曲げ剛性が一端部４０３ａから他端部に向けて順に低くなり、排気圧の増加に応じて板状弁４０３の開度が段階的に変化するような開度特性を得られる。
【００２０】
図５はバルブ装置４の第４実施形態を示している。この第４実施形態と上記第３実施形態との相違点は、第１乃至第３薄板部材４０３Ａ、４０３Ｂ、４０３Ｃの積層順序を第３実施形態とは逆にしたことである。これによれば、バルブ装置４の上流側のガス圧の低下で板状弁４０３が上流側に撓む時に、薄板部材４０３Ａ、４０３Ｂ、４０３Ｃ間の摩擦を生じて振動が減衰される。
【００２１】
また、上記第１、第２実施形態のものでは、板状弁４３をハウジング４２の弁座部４２ａに撓み変形させた状態で着座させているが、板状弁を撓み変形させずに弁座部に着座させるようにしたバルブ装置にも同様に本発明を適用できる。
【００２２】
【発明の効果】
以上の説明から明らかなように、本発明によれば、排気ガス圧の変動による板状弁の開閉振動のエネルギーを放散させて、板状弁の共振を抑制できる。
【図面の簡単な説明】
【図１】本発明に係るバルブ装置を備える消音器の一例の截断側面図
【図２】バルブ装置の第１実施形態の截断側面図
【図３】（Ａ）バルブ装置の第２実施形態の截断側面図
（Ｂ）図３（Ａ）の左側面図
（Ｃ）図３（Ｂ）のIIIＣ−IIIＣ線拡大截断面図
【図４】バルブ装置の第３実施形態の截断側面図
【図５】バルブ装置の第４実施形態の截断側面図
【符号の説明】
１消音器
４バルブ装置
４１、４０１弁孔
４２、４０２ハウジング
４３、４０３板状弁
４３ａ、４０３ａ一端部
４３ｂ段差
４３Ａ、４３Ｂ、４０３Ａ〜４０３Ｃ薄板部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device for a silencer that is mainly interposed in an exhaust system of a vehicle engine, and more specifically, a valve device that opens a bypass path of exhaust gas in the silencer when the exhaust pressure rises to a predetermined pressure. About.
[0002]
[Prior art]
The applicant of the present application previously provided, as this type of valve device, according to Japanese Patent Application No. 10-110580, a housing having a valve hole through which exhaust gas circulates and a valve for opening and closing the valve hole. It is composed of a plate-like valve that can be flexibly deformed and one end is fixed to the housing, and the plate-like valve is elastic to the valve seat provided on the periphery of the valve hole on the housing surface where the plate-like valve is fixed. It is seated in a state of being biased to the closed side by a restoring force, and when the exhaust pressure exceeding this elastic restoring force acts on the plate-like valve, the plate-like valve is bent to the open side and the valve hole is opened. In accordance with Japanese Patent Application No. 10-177414, a rectangular pipe is cut into a housing to form a housing, and one side of the open end of the rectangular pipe housing is cut and raised to form a valve fixing portion. Screw the plate valve and Constitute an enclosure wall in the pipe wall outside the valve fixing part GIN surround the plate-like valve, proposes that the plate-like valve is omitted valve seat to be seated.
[0003]
[Problems to be solved by the invention]
In the above conventional example, opening and closing vibration occurs in the plate valve that is opened and closed by the exhaust gas flow. When this opening and closing frequency matches the natural frequency of the plate valve formed of a single member, the plate valve It will resonate. The resonance of the plate valve becomes stronger when the plate valve is deformed, that is, when the opening of the valve is increased. Therefore, even if it is desired to increase the maximum opening of the valve in order to increase the horsepower of the engine, the opening cannot be set as required.
[0004]
This invention makes it a subject to provide the valve apparatus for silencers which enabled it to suppress the resonance of a plate-shaped valve in view of the above point.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a valve device that opens when the exhaust pressure rises to a predetermined pressure in the exhaust gas bypass path in the silencer, the housing having a valve hole through which the exhaust gas flows, A valve that opens and closes the valve hole, and is configured by a plate-like valve that is elastically bent and deformable and has one end fixed to the housing. The plate-like valve has a laminated structure of a plurality of thin plate members, Friction between the thin plate members causes friction between the thin plate members.
[0006]
According to this, a plurality of thin plate members that are constituent members repeat the same opening and closing vibration due to the opening and closing vibration of the plate valve, but at this time, frictional heat is generated by friction between the opposing thin plate members, and the energy of the opening and closing vibration is generated. Is dissipated as thermal energy, so that vibration amplification of the plate valve can be prevented.
[0007]
Further, in order to more effectively suppress the resonance of the plate-like valve, it is desirable to make the natural frequencies of the thin plate members different from each other, and for this purpose, the plate thickness, area and length of the thin plate members are mutually different. What is necessary is just to make it different. Here, in a valve device of a type in which a plate-like valve is seated on the valve seat, the plate-like valve strikes the valve seat. Therefore, in order to ensure the durability of the plate-like valve, the valve seat side, that is, the exhaust gas flow It is desirable to make the plate thickness of the thin plate member located on the upstream side larger than the plate thickness of the thin plate member located on the downstream side. Further, if the area of the thin plate member located on the upstream side of the exhaust gas flow is made larger than the area of the thin plate member located on the downstream side and a step is formed on the outer peripheral surface of the plate valve, The force of pressing the upstream thin plate member against the downstream thin plate member is generated by the exhaust gas flow involving the step when the valve is opened, and the frictional force between the thin plate members is increased to improve the vibration damping characteristics.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a silencer interposed in the middle of an exhaust system of an internal combustion engine, and includes a cylindrical shell 11 and end walls 12 and 13 that close one end and the other end of the shell 11. A first and second pair of separators 14 and 15 are provided in a silencer main body constituted by: a space in the main body, and a first silencer chamber 31 between the one end wall 12 and the first separator 14. The second silencer chamber 32 between the first separator 14 and the second separator 15 and the third silencer chamber 33 between the second separator 15 and the other end wall 13 are divided. Further, the silencer 1 has an exhaust inflow pipe 21 that passes through the one end wall 12, the first separator 14, and the second separator 15 and communicates with the third silencer chamber 33, and the second separator 15 and the first separator 14. Through the inner pipe 22 communicating with the third silencing chamber 33 and the first silencing chamber 31, the first separator 14, the second separator 15, and the other end wall 13, respectively. And an exhaust outlet pipe 23 that communicates with the atmosphere.
[0009]
A number of through holes 21 a are formed in the tube wall of the second silencing chamber 32 of the exhaust inflow pipe 21, and a number of through holes 22 a are also formed in the tube wall of the second silencing chamber 32 of the inner pipe 22. The exhaust inflow pipe 21 and the inner pipe 22 are configured to communicate with each other via the second silencing chamber 32.
[0010]
According to this, the flow path of the exhaust gas that has flowed into the exhaust inflow pipe 21 is a path that reaches the exhaust outflow pipe 23 via the third silencing chamber 33, the inner pipe 22, and the first silencing chamber 31, and the through hole 21a. And the second silencing chamber 32, the through hole 22 a, the inner pipe 22, and the path reaching the exhaust outlet pipe 23 through the first silencing chamber 31.
[0011]
By the way, when a large amount of exhaust gas flows into the exhaust inflow pipe 21 as the internal combustion engine rotates at high speed, the exhaust pressure in the sound deadening chambers 32 and 33 is increased in the exhaust gas flow paths of only the two systems, and as a result The engine output decreases.
[0012]
Therefore, the first separator 14 is provided with an opening 14a for a bypass path that allows the second silencing chamber 32 and the first silencing chamber 31 to communicate with each other, and when the exhaust pressure rises to a predetermined pressure in the opening 14a. A valve device 4 that opens the bypass path is provided, and in a high rotation range of the internal combustion engine, a large amount of exhaust gas is smoothly discharged to the atmosphere through the three distribution paths in which the bypass path is added to the two systems described above. .
[0013]
As shown in FIG. 2, the valve device 4 includes a housing 42 having a valve hole 41, and a plate-shaped valve 43 that can be elastically bent and deformed as a valve that opens and closes the valve hole 41. The first separator 14 is screwed with a screw 44 so that the valve hole 41 matches the opening 14a.
[0014]
The housing 42 is formed of a square member made of a forged or cast product, provided with a valve hole 41 at the center thereof, and opened with a valve fixing part 42b and a valve hole 41 adjacent to the valve hole 41 on the side surface on the exhaust gas outflow side. The valve seat portion 42a is formed. The valve seat portion 42a is formed in a concave curved surface that rises from the valve fixing portion 42b side toward the side facing the valve fixing portion 42b while gradually increasing the radius of curvature. Then, the one end 43a of the plate-like valve 43 is fastened together with the plate-like stopper member 46 that restricts the deflection of the plate-like valve 43 toward the opening side to the valve fixing portion 42b of the housing 42 with the screw 45, and the stopper member 46 This prevents the plate valve 43 from being bent excessively on the open side.
[0015]
The plate-like valve 43 has a laminated structure of a first thin plate member 43A located on the upstream side of the exhaust gas flow and a second thin plate member 43B located on the downstream side, and the joint portion between the thin plate members 43A and 43B. The one end 43a is formed by the screw 45, and the mutual deformation of the thin plate members 43A and 43B is caused by the bending deformation of the plate valve 43. In a state where the plate-like valve 43 is bent and deformed, the first thin plate member 43A on the upstream side is seated on the valve seat portion 42a to close the valve hole 41. In this state, the plate-like valve 43 is elastically restored by its own deformation. It will be biased to the closing side by force. When the exhaust pressure in the second silencing chamber 32 becomes equal to or higher than a predetermined pressure corresponding to the elastic restoring force of the plate-like valve 43, the plate-like valve 43 bends to the open side, and the valve hole 41 is opened to bypass the bypass path. Exhaust gas flows through. Here, when the plate-shaped valve 43 is opened and closed due to fluctuations in the exhaust pressure, friction between the first and second thin plate members 43A and 43B is generated, and the energy of the opening and closing vibration is dissipated as heat energy. Vibration amplification of the valve 43 is suppressed and resonance is prevented.
[0016]
Further, in order to more effectively prevent the resonance of the plate valve 43, it is desirable to make the natural frequencies of the first and second thin plate members 43A and 43B different from each other. Therefore, in the present embodiment, the thickness t1 of the first thin plate member 43A is set to 0.15 mm, for example, and the thickness t2 of the second thin plate member 43B is set to 0.1 mm, for example, so that t1> t2. . According to this, the difference between the natural frequencies of the two thin plate members 43A and 43B can effectively suppress the resonance of the plate valve 43, and the durability of the first thin plate member 43A hitting the valve seat portion 42a, As a result, the durability of the plate valve 43 can be improved.
[0017]
FIG. 3 shows a second embodiment of the valve device 4, and the same members as those in the first embodiment shown in FIG. In the second embodiment, as shown in FIGS. 3A and 3B, the area of the first thin plate member 43A located on the upstream side is compared with the area of the second thin plate member 43B located on the downstream side. As shown in FIG. 3C, a step 43b having a predetermined width W (for example, 1.5 mm) is formed on the outer peripheral surface excluding the one end 43a side of the plate valve 43. According to this, when the plate-like valve 43 is opened, the exhaust gas flow is caught in the step 43b portion, and the force for pressing the first thin plate member 43A against the second thin plate member 43B is generated, and both the first and second plates are generated. The frictional force between the thin plate members 43A and 43B increases and the vibration damping characteristics are improved.
[0018]
FIG. 4 shows a third embodiment of the valve device 4. The housing 402 of the valve device 4 according to the third embodiment is formed in a square pipe shape having an inner circumferential space as a valve hole 401. One side of one open end of the housing 402 is cut and raised to form a valve fixing portion. 402b is formed, and one end 403a of the plate valve 403 and the stopper member 406 are fastened together with a screw 405, and a surrounding wall 402a that surrounds the plate valve 403 with a pipe wall other than the valve fixing portion 402b of the housing 402 is formed. doing.
[0019]
This plate-like valve 403 is formed by joining and laminating the first to third thin plate members 403A, 403B, and 403C only at one end portion 403a, and the first thin plate member 403A is substantially formed in the valve hole 401. The length from the one end 403a to the other end is shortened in the order of the first thin plate member 403A, the second thin plate member 403B, and the third thin plate member 403C, and from the upstream side to the downstream side of the exhaust gas flow. The first thin plate member 403A, the second thin plate member 403B, and the third thin plate member 403C are stacked in this order. According to this, when the plate-like valve 403 is bent downstream, friction is generated between the thin plate members 403A, 403B, and 403C, and the vibration is attenuated. Further, the opening characteristic is such that the bending rigidity of the plate valve 403 decreases in order from one end 403a to the other end, and the opening of the plate valve 403 changes stepwise as the exhaust pressure increases. can get.
[0020]
FIG. 5 shows a fourth embodiment of the valve device 4. The difference between the fourth embodiment and the third embodiment is that the stacking order of the first to third thin plate members 403A, 403B, and 403C is reversed from that of the third embodiment. According to this, when the plate valve 403 bends upstream due to a decrease in gas pressure on the upstream side of the valve device 4, friction is generated between the thin plate members 403A, 403B, and 403C to attenuate the vibration.
[0021]
In the first and second embodiments, the plate-like valve 43 is seated in a state of being bent and deformed on the valve seat portion 42a of the housing 42, but the plate-like valve is not bent and deformed. The present invention can be similarly applied to a valve device that is seated on a portion.
[0022]
【The invention's effect】
As is apparent from the above description, according to the present invention, the resonance of the plate valve can be suppressed by dissipating the energy of the opening and closing vibration of the plate valve due to the fluctuation of the exhaust gas pressure.
[Brief description of the drawings]
FIG. 1 is a cutaway side view of an example of a silencer including a valve device according to the present invention. FIG. 2 is a cutaway side view of a first embodiment of the valve device. FIG. 3A is a view of a second embodiment of the valve device. Cut side view (B) Left side view of Fig. 3 (A) (C) Expanded cross sectional view taken along line IIIC-IIIC of Fig. 3 (B) Fig. 4 Cut side view of the third embodiment of the valve device [Fig. ] Cutaway side view of the fourth embodiment of the valve device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Silencer 4 Valve apparatus 41, 401 Valve hole 42, 402 Housing 43, 403 Plate-shaped valve 43a, 403a One end part 43b Level difference 43A, 43B, 403A-403C Thin plate member

Claims

消音器内の排気ガスのバイパス経路を排気圧が所定圧に上昇したときに開くバルブ装置であって、
排気ガスが流通する弁孔を有するハウジングと、弁孔を開閉するバルブとを備え、バルブを弾性的に撓み変形可能で一端部をハウジングに固定した板状弁で構成するものにおいて、
該板状弁を複数の薄板部材による積層構造とし、板状弁の撓み変形でこれら薄板部材相互の摩擦が生じるようにしたことを特徴とする消音器用バルブ装置。A valve device that opens when the exhaust pressure rises to a predetermined pressure in the exhaust gas bypass path in the silencer,
In what comprises a housing having a valve hole through which exhaust gas circulates, and a valve that opens and closes the valve hole, the valve is elastically deflectable and deformable and one end is fixed to the housing.
A valve device for a silencer, characterized in that the plate-like valve has a laminated structure composed of a plurality of thin plate members, and friction between the thin plate members is caused by bending deformation of the plate-like valve.

前記複数の薄板部材の中で、排気ガス流の上流側に位置する薄板部材の板厚を、下流側に位置する薄板部材の板厚に比較して厚くしたことを特徴とする請求項１記載の消音器用バルブ装置。2. The plate thickness of the thin plate member located upstream of the exhaust gas flow among the plurality of thin plate members is made larger than the plate thickness of the thin plate member located downstream. Valve unit for silencer.

前記複数の薄板部材の中で、排気ガス流の上流側に位置する薄板部材の面積を、下流側に位置する薄板部材の面積に比較して大きくし、板状弁の外周面に段差を形成したことを特徴とする請求項１及び２記載の消音器用バルブ装置。Among the plurality of thin plate members, the area of the thin plate member located on the upstream side of the exhaust gas flow is made larger than the area of the thin plate member located on the downstream side, and a step is formed on the outer peripheral surface of the plate valve. The valve device for a silencer according to claim 1 or 2, wherein the valve device is a silencer.

前記複数の薄板部材の一端部から他端部までの長さに差を付けたことを特徴とする請求項１及び２記載の消音器用バルブ装置。3. The silencer valve device according to claim 1, wherein a difference is provided in the length from one end portion to the other end portion of the plurality of thin plate members.