JPS6181512A - Muffler - Google Patents

Abstract

PURPOSE:To aim at making a muffler into miniaturization and lightweightiness, by connecting a large diametral exhaust inflow port and a small diametral outflow port of the muffler with a conically cylindrical inner tube, while installing an exhaust port and an exhaust guide in this inner tube. CONSTITUTION:An exhaust gas inflow port 31 of a muffler body 21 is formed into being large diametral while an exhaust port 32 into being small diametral, respectively, and these inflow and outflow ports 31 and 32 are connected with a conically cylindrical inner tube 30. An outlet hole 33 of exhaust gas to the muffler body is installed at the inflow port side while a suction hole 35 of the exhaust gas from the muffler body is installed at the exhaust port side, respectively. And, a guide plate 34 is installed in this outlet hole 33, making the exhaust gas point to an inner wall of the muffler body. With this constitution, a flow velocity of the exhaust gas is raised so high making it perform a collision and an interference with the inner wall, and thereby decompression and muffling action effects are improved and, what is more, since there is no partition for the inside of the muffler body by a partition plate, the promotion of miniaturization and lightweightiness both are attainable with a simple structure.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は内燃機関の消音器に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a muffler for an internal combustion engine.

（従来の技術） 従来の一般的な消音器は、所定古着の消音器本体の内部
を仕シ」板で区画して複数の膨張室を形成し、これらＩ
ｈｉ／張室を仕切板に設けた連通パイプで座通し、流入
口側の膨張室にはエンジンからの排気管を接続し、排気
側の膨張室には外部と連通するテールパイプを臨ませて
構成され、そして消音器本体内に排気ガスを導入して膨
張、収縮を繰り返して行い、排気ガスが有するエネルギ
ーを消耗せしめて消音効果を図っている。(Prior Art) A conventional general muffler has a silencer main body made of predetermined used clothing, whose interior is partitioned with partition plates to form a plurality of expansion chambers.
hi/The expansion chamber is connected through a communication pipe provided on the partition plate, the exhaust pipe from the engine is connected to the expansion chamber on the inlet side, and the tail pipe communicating with the outside is exposed to the expansion chamber on the exhaust side. Exhaust gas is introduced into the muffler body, and the muffler body repeatedly expands and contracts, thereby consuming the energy of the exhaust gas and achieving a muffling effect.

（発明が解決しようとする問題点） しかしながら、斯かる消音器においては排気ガスが膨張
室間を繋ぐ連通パイプを通過する際の抵抗等によりエン
ジン出力の低下を招き易い。(Problems to be Solved by the Invention) However, in such a muffler, engine output tends to decrease due to resistance when exhaust gas passes through a communication pipe connecting the expansion chambers.

一方、エンシフ出力の低下を可及的に抑制するためには
消音器本体を大官ｔ−とする必要性が生じるが、特にオ
ートバイにおいては車体構造上、外観性の兼合いから消
音器本体の太さ、長さ等の寸法は自ずと制約を受け、消
音器本体を大容量とすることは困難であり、したがって
エンジン出力の維持も合せ持つ消音器においては、小型
、軽量化を達成することは難しい問題であった。On the other hand, in order to suppress the decrease in engine output as much as possible, it is necessary to make the main body of the muffler t-, but especially for motorcycles, due to the body structure and appearance, the main body of the muffler is Dimensions such as thickness and length are naturally limited, and it is difficult to make the muffler body large in capacity. Therefore, it is difficult to achieve a smaller size and lighter weight in a muffler that also maintains engine output. It was a difficult problem.

本発明は以上の如き消音器の問題点を有効に解決すべく
成されたもので、その目的とする処は。The present invention has been made to effectively solve the problems of the silencer as described above, and its purpose is as follows.

外形寸法を可及的に小さくしつつ排気ガスの背圧を下げ
てエンジン出力の損失を防止し、且つ充分なる消ｉ７効
果を発揮するよにした消ｒ？器を提供するにある。This is an extinguisher designed to reduce the external dimensions as much as possible, lower the back pressure of exhaust gas, prevent loss of engine output, and exhibit a sufficient extinguishing effect. It is to provide the equipment.

（問題点を解決するための子役） 斯かる［１的を達成するため本発明は、消音器本体に大
径の排気ガス流入口と、小径の排出口を形成し、これら
流入口と排出口とを円錐筒状の内筒にて、！Ｉ！結し、
この内筒の流入口側には消音器本体内への排気カスの導
出孔を、また排出口側には消音器本体内よりの排気ガス
の吸出孔を夫々設けるとともに、前記導出孔には排気ガ
スを消音器本体の内壁に指向せしめるガイｌを設けたこ
とを来旨とする。(Chief role for solving the problem) In order to achieve the first objective, the present invention forms a large-diameter exhaust gas inlet and a small-diameter outlet in the muffler body, and connects these inlets and exhaust ports. With a conical inner cylinder,! I! Tie,
The inlet side of this inner cylinder is provided with a hole for discharging exhaust gas into the muffler body, and the discharge port side is provided with a suction hole for exhaust gas from within the muffler body. The idea is to provide a guide l that directs gas toward the inner wall of the muffler body.

（実施例） 以下に本発明の好適一実施例を添付図面に基づいて詳述
する。(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

第４図は本発明に係る消音器を適用した自動二輪中の側
面図を示したもので　目動二輪車（１）は車体フレーム
（２）の前端にヘットパイプ（３）をｉｉえ、ヘッドバ
イブ（３）には１６１輪（４）を支持するフロントフォ
ーク（５）が操向自在に支持され、トップブリッジ上に
はハンドル（６）を備える。車体フレーム（２）の前部
上部には燃料タンク（７）が、またこれの後方にはシー
ト（８）が各付設されるとともに、燃料タンク（７）下
方の＝ｊＬ体フレーム（２）にはエンジン（３）が搭載
され、エンジン（３）の側方及び車体の前部上部はフェ
アリノグ（１０）で覆われている。車体フレーム（２）
の後下部には後輪（１１）を支持するリヤフォーク（１
２）が枢着送出され、このリヤフォーク（１２）と車体
フレーム間にはりャクッノヨノユニット（＋３）が介設
され、エンノン（８）の排気管（１４）には後輪（１１
）の側方に配設された消１季器（２０）が接続されてい
る。Figure 4 shows a side view of a motorcycle to which the silencer according to the present invention is applied. 3), a front fork (5) supporting 161 wheels (4) is supported in a freely steerable manner, and a handle (6) is provided on the top bridge. A fuel tank (7) is attached to the upper front part of the vehicle body frame (2), and a seat (8) is attached to the rear of this. is equipped with an engine (3), and the sides of the engine (3) and the upper front part of the vehicle body are covered with a fairinog (10). Vehicle frame (2)
The rear fork (1) that supports the rear wheel (11) is located at the lower rear of the
2) is pivoted and delivered, a rear fork (12) and a rear wheel unit (+3) are interposed between the rear fork (12) and the body frame, and the exhaust pipe (14) of the ennon (8) is connected to the rear wheel (11).
) is connected to an extinguisher (20) placed on the side.

第１図は消音器（２０）の平断面図、第２図は第１図の
矢視？方向の端面図、：ｔＩＪ３図は第１図の３−３線
断面図を示したもので、消音器（２０）は円筒形状をな
す本体（２１）を備え１本体（２１）のＮＯ端面には排
気カスの大径の流入口（２２）が、後端面には小径の排
出口（２３）が各形成され、これら流入口（２２）と排
出口Ｃ２３）とは本体（２１）内に配設された円錐筒状
の内筒（３０）にて連結されている。内筒（３０）は大
径の前端！’１Ｒ（３０ａ）が本体（２１）の流入口（
２２）に挿着されてその一部が本体（２１）外に臨み、
前嬬部（３Ｏａ）の開口が排気ガスの実質的な流入口（
３１）とされ、この流入口（３１）にエンジン（３）か
ら逸出される排気’ｆｆ（１４）が接続され、又小径の
後端部（Ｊｏｂ）は本体（２１）の流出口（２３）を形
成したボス部（２４）に挿着支持され　後端部（３０ｂ
）の開口が実質的な排気ガスの排出口（３２）となって
おり、又内筒（３０）は本体（２１）と回軸的に配置さ
れ、図示例では前部（３ＱＡ）乃至中間部（３０Ｂ）は
先細り形状をなし、後部（ＳａＣ）は径が一定で円筒形
状をなしている。Figure 1 is a plan cross-sectional view of the silencer (20), and Figure 2 is in the direction of the arrow in Figure 1? The end view in the direction: tIJ3 is a sectional view taken along the line 3-3 in FIG. A large-diameter inlet (22) for exhaust gas and a small-diameter outlet (23) are formed on the rear end surface, and these inlet (22) and outlet C23) are arranged in the main body (21). They are connected by a conical inner cylinder (30) provided therein. The inner cylinder (30) has a large diameter front end! '1R (30a) is the inlet of the main body (21) (
22) and a part thereof faces outside the main body (21),
The opening of the front opening (3Oa) is the substantial inlet for exhaust gas (
31), and the exhaust 'ff (14) escaping from the engine (3) is connected to this inlet (31), and the small diameter rear end (Job) is connected to the outlet (23) of the main body (21). ) is inserted and supported by the boss part (24) formed with the rear end part (30b
) serves as a substantial exhaust gas discharge port (32), and the inner cylinder (30) is arranged rotationally with the main body (21), and in the illustrated example, the inner cylinder (30) is arranged from the front part (3QA) to the middle part. (30B) has a tapered shape, and the rear part (SaC) has a constant diameter and a cylindrical shape.

斯かる内筒（３０）の前部（３０Ａ）乃至中間部（３０
Ｂ）には内筒（３０）内と本体（２１）内とを逮通し、
排気ガスを本体（２１）内に導いて膨張せしめるための
複数の導出孔（３３）・・・が形成され、又６導出孔（
３３）・・・には排気ガスを本体（２１）の内壁に指向
せしめるとともに排気ガスの流速を高めるためのガイド
板（３４）・・が内筒（３０）内に臨む如く設けられて
いる０図示例では、内筒（３０）の流入口（３１）側に
周方向に１８０’　６間する如く２個の導出孔（３３Ａ
）を設け、これより下流側に上記導出孔（３３Ａ）に対
して３０゜ずつ位相をずらせる如く、且つ内１（３０）
の軸方向に等間隔に導出孔（３３Ｂ）、（３３ｆｌ：）
、（３３０）を夫々２個ずつ設け、各導出孔（３３＾）
、（３３Ｂ）、（３３ｆｌ：）、（３３０）には夫々ガ
イド板（３４Ａ）、（３４Ｂ）、（３４Ｇ）、（３４０
）が設けられている。The front part (30A) to the middle part (30
B) is inserted between the inside of the inner cylinder (30) and the inside of the main body (21),
A plurality of outlet holes (33) for guiding exhaust gas into the main body (21) and expanding it are formed, and six outlet holes (
33)... is provided with a guide plate (34) facing into the inner cylinder (30) for directing the exhaust gas toward the inner wall of the main body (21) and increasing the flow velocity of the exhaust gas. In the illustrated example, two outlet holes (33A
), on the downstream side thereof, the phase is shifted by 30 degrees with respect to the above-mentioned lead-out hole (33A), and the inner one (30)
Lead-out holes (33B), (33fl:) at equal intervals in the axial direction of the
, (330) are provided, and each lead-out hole (33^) is provided.
, (33B), (33fl:), and (330) have guide plates (34A), (34B), (34G), and (340), respectively.
) is provided.

一方内筒（３０）の排出口（３２）側の円筒形状をなす
後部（３０Ｇ）には前記導出孔（３３）・・・とは反対
に本体（２１）内の排気ガスを内筒（３０）内に吸入せ
しめて排出口（３２）から排出するための吸出孔（３５
）・・・が設けられ、図示例では内筒（３０）の中間部
（３０Ｂ）富りに周方向に　１８０°離間して２個の吸
出孔（３５Ａ）が形成されるとともに、これより下流側
に上記吸出孔（３５Ａ）に対して９０度位相をずらせて
同様に２個の吸出孔（３５Ｂ）が形成され、夫々の吸出
孔（３５Ａ）　。On the other hand, in the cylindrical rear part (30G) on the exhaust port (32) side of the inner cylinder (30), opposite to the outlet hole (33)... ) and discharge it from the outlet (32).
)..., and in the illustrated example, two suction holes (35A) are formed in the middle part (30B) of the inner cylinder (30) at a distance of 180° in the circumferential direction, and the downstream part Two suction holes (35B) are similarly formed on the side with a phase shift of 90 degrees with respect to the suction hole (35A), and each suction hole (35A).

（３５Ｂ）には排気ガスの内筒（３０）内への流入を促
進させるためのガイド板（３８Ａ）　、　（３６Ｂ）が
本体（２１）内に臨む如く設けられている。Guide plates (38A) and (36B) for promoting the flow of exhaust gas into the inner cylinder (30) are provided at (35B) so as to face into the main body (21).

又、本体（２１）の内壁番こは長さ方向略全体に亘って
グラスウール等の吸音材（２５）が配設され、前記導出
孔（３「）・・・からの排気ガスの衝突時の消音効果の
増大を図っている。In addition, a sound-absorbing material (25) such as glass wool is arranged on the inner wall of the main body (21) over almost the entire length direction, so that when the exhaust gas from the outlet holes (3'') collides, The aim is to increase the sound deadening effect.

以上の消音器において、排気ガスはエンジン（３）から
排気管（１４）を通過して流入口（３１）から内筒００
）へ流れるが、内筒（３０）は排気ガスの流れる方向に
先細りとなっているため導出孔（３３）・・・から本体
（２１）内に導かれる。この時、・ｎ出孔（３３）・・
・は内筒（３０）の軸方向４ケ所で２個ずつ９０’位相
をずらして設けられているため、排気ガスの収縮、膨張
は３０度位相をずらして４回行われ、十分なる減圧作用
、つまり消音作用が行われるとともに、本体（３０）内
に導びかれる排気ガスは導出孔（３３）・・・に設けた
ガイド板Ｃ３４）・・・により本体（２１）の内壁に指
１ム１せしめられ、且つ流速も高められ、そして内壁に
衝突する排気ガス流の消音効果は吸音材（２５）にて増
大される。又排気カス流の内壁との衝突による反射流相
互の干渉及びこの反射流と導出孔（３３）・・かうの排
気カス流との干渉によっても減圧作用が或される。In the above silencer, exhaust gas passes from the engine (3) through the exhaust pipe (14) and from the inlet (31) to the inner cylinder 00.
), but since the inner cylinder (30) is tapered in the direction in which exhaust gas flows, it is guided into the main body (21) from the outlet holes (33). At this time, ・n exit hole (33) ・
- are provided at four locations in the axial direction of the inner cylinder (30), two each with a phase shift of 90', so the contraction and expansion of the exhaust gas is performed four times with a phase shift of 30 degrees, resulting in a sufficient pressure reduction effect. In other words, the silencing effect is carried out, and the exhaust gas guided into the main body (30) is guided into the inner wall of the main body (21) by one finger through the guide plate C34) provided in the outlet hole (33). 1 and the flow velocity is also increased, and the silencing effect of the exhaust gas flow impinging on the inner wall is increased by the sound absorbing material (25). Further, the pressure reduction effect is also caused by mutual interference between the reflected flows caused by the collision of the exhaust gas flow with the inner wall, and interference between this reflected flow and the exhaust gas flow from the outlet hole (33).

一方、導出孔（３３）・・・から本体（２１）内部へ流
出しなかった排気カス流の一部は内筒（３０）内を一１
ＩＩ過して内１；２　（３ｔｌ）の小径部である後部（
３０Ｃ）で流速が高められ、この流速の早い排気カス流
によって本体（２１）内部に導かれた排気ガス流は内筒
（３０）の後部（３０Ｃ；）に設けた吸出孔（３５）・
・・から内筒（３０）内へ半強制的に吸入され排出口（
３２）から外部へ排出される。このため本体（２１）内
部に排気ガスが滞留することがなく、本体（２１）の容
量に対して効率よく消ぎ作用が成される。尚、本実施例
では導出孔、吸出孔を内筒に複数設け、且つ内筒の軸方
向に対しては９０”ずつ位相をずらせて設けたが、導出
孔、吸出孔の数及び位置は任意であり、又吸出孔側のガ
イド板の有無は任意であり、更に必要に応じて−ｉには
仕切板を設けるようにしても良い。On the other hand, a part of the exhaust gas flow that did not flow into the main body (21) from the outlet holes (33)...
The rear part (3 tl) is a small diameter part of the inner 1;2 (3 tl)
30C), and the exhaust gas flow guided into the main body (21) by this high-velocity exhaust gas flow is passed through the suction hole (35) provided at the rear part (30C;) of the inner cylinder (30).
It is semi-forcibly sucked into the inner cylinder (30) from the outlet (
32) is discharged to the outside. Therefore, the exhaust gas does not remain inside the main body (21), and an efficient extinguishing action is performed on the capacity of the main body (21). In this example, a plurality of outlet holes and suction holes were provided in the inner cylinder, and the phases were shifted by 90'' with respect to the axial direction of the inner cylinder, but the number and position of the outlet holes and suction holes can be changed arbitrarily. The presence or absence of a guide plate on the suction hole side is optional, and if necessary, a partition plate may be provided at -i.

（発明の効果） 以Ｅの説明で明らかな如く本発明によれば、消音器本体
の流入口と排出１コとを本体内部で円錯筒状の内筒にて
連結したため、排気ガスの背圧を下げてエン／／出力の
低下を防止することができるとともに、内筒に排気ガス
の導出孔を設けて収縮、膨張を行わせ、導出孔にガイド
板を設けて排気ガスを消音器本体内部に指向せしめ、且
つこれの流速も高めて排気カス流の衝突、干渉を行わせ
るようにしたため、充分なる減圧、消音作用の効果が得
られる。又消音器本体内部の排気ガス流は流速の早い排
出口付近の円ｍ筒状の内筒内の排気ガス流によって強制
的に吸い出されるため、消音器本体内部での排気ガス流
の滞留がなく、）ｉ前奏に体の容♀に対して効率的に消
「作用が成され。(Effects of the Invention) As is clear from the explanation below, according to the present invention, the inlet of the muffler main body and the exhaust port are connected inside the main body by a circular cylinder-shaped inner cylinder, so that the back of the exhaust gas is In addition to lowering the pressure and preventing a drop in engine//output, an exhaust gas outlet hole is provided in the inner cylinder to allow contraction and expansion, and a guide plate is provided in the outlet hole to direct the exhaust gas to the muffler body. Since the flow is directed inward and the flow velocity is increased to cause collision and interference with the exhaust gas flow, sufficient pressure reduction and noise reduction effects can be obtained. In addition, the exhaust gas flow inside the muffler body is forcibly sucked out by the exhaust gas flow in the cylindrical inner cylinder near the discharge port, which has a high flow rate, so that the exhaust gas flow does not stagnate inside the muffler body. (without) i prelude, it has an efficient effect on the body's appearance.

消音器本体を可及的に小ざくすることができる。The main body of the muffler can be made as small as possible.

更に従来の如く消音器本体内部を仕切板で小室に区画す
ることがないため、消音器本体の共振が著しく低下しＳ
！すを抑制することができるだけでなく、リヘー、トや
溶接等の加工が不要で組立性等が簡便となり、外観性に
潰れ、軽屓小型で　且つ安価な消音器を製作することが
できる。Furthermore, because the inside of the muffler body is not divided into small chambers with partition plates as in the past, the resonance of the muffler body is significantly reduced and S
! This not only makes it possible to suppress noise, but also simplifies assembly as there is no need for processing such as reheating, welding, etc., and it is possible to manufacture a silencer that is compact in appearance, lightweight, and inexpensive.

４　図面の１！！ＩＩ′ｌｉな説明 第１Ｕｙ５は本発明に係る消音器の平断面図、第２図は
第１図矢視２方向の端面図、第３図は第１図３−３線断
面図、第４図は本発明に係る消音器を適用した自動二輪
車の側面図である。4 Drawing 1! ! II'li Explanation No. 1 Uy5 is a plan sectional view of the silencer according to the present invention, FIG. 2 is an end view in two directions as viewed from the arrow in FIG. The figure is a side view of a motorcycle to which the silencer according to the present invention is applied.

尚、図面中（２１）は消音器本体、（３０）は内筒、（
３１）は内０あ流入口、（３２）は内筒の排出口、　　
（３３）は導出孔、　（３４）はガイド板、（３５）は
吸出孔である。In addition, (21) in the drawing is the silencer main body, (30) is the inner cylinder, (
31) is the inner 0a inlet, (32) is the outlet of the inner cylinder,
(33) is an outlet hole, (34) is a guide plate, and (35) is a suction hole.

Claims (1)

【特許請求の範囲】[Claims] 消音器本体への排気ガス流入口を大径に、大気への排出
口を小径に夫々形成し、これら流入口と排出口とを円錐
筒状の内筒で連結し、該内筒の流入口側には消音器本体
内への排気ガスの導出孔を、排出口側には消音器本体内
よりの排気ガスの吸出孔を夫々設けるとともに、前記導
出孔には排気ガスを消音器本体の内壁に指向せしめるガ
イド板を設けたことを特徴とする消音器。The exhaust gas inlet to the muffler main body is formed with a large diameter, and the exhaust gas outlet to the atmosphere is formed with a small diameter, and these inlets and exhaust ports are connected by a conical inner cylinder, and the inlet of the inner cylinder is formed with a small diameter. A vent hole for exhaust gas into the muffler body is provided on the side, and a suction hole for exhaust gas from within the muffler body is provided on the exhaust port side. A silencer characterized by being provided with a guide plate that directs the sound to the direction of the sound.