JPS6111452Y2

JPS6111452Y2 -

Info

Publication number: JPS6111452Y2
Application number: JP14704479U
Authority: JP
Priority date: 1979-10-25
Filing date: 1979-10-25
Publication date: 1986-04-11
Also published as: JPS5666014U

Description

【考案の詳細な説明】この考案はオートバイ等の小型エンジンのプレ
マフラの改良に関する。[Detailed description of the invention] This invention relates to an improvement of a pre-muffler for a small engine such as a motorcycle.

多気筒のオートバイエンジンでは左右の排気管
の尾端をエンジンケースの下側に置いたプレマフ
ラに挿入し、プレマフラで一次膨脹させ、更にプ
レマフラの後端左右にマフラを連結し、マフラで
消音して後方に放出している。オートバイの場
合、エンジンは車体中央下部に装着され、プレマ
フラはその下側に位置し、しかも排気管の尾端を
挿入するので排気管の径よりも巾厚になる。従つ
てその分、地面に近づき、ロードクリアランスが
十分にとれなくなる不都合がある。 In a multi-cylinder motorcycle engine, the tail ends of the left and right exhaust pipes are inserted into the pre-muffler placed on the underside of the engine case, the pre-muffler causes primary expansion, and mufflers are connected to the left and right rear ends of the pre-muffler to muffle the sound. It is emitted backwards. In the case of a motorcycle, the engine is mounted at the lower center of the vehicle body, and the pre-muffler is located below it, and the tail end of the exhaust pipe is inserted into it, so it is wider than the diameter of the exhaust pipe. Therefore, there is an inconvenience that the vehicle is closer to the ground and sufficient road clearance cannot be obtained.

この考案はかかる点に鑑み改善したもので、以
下図面に示す本考案の実施例について説明する。 This invention has been improved in view of these points, and the embodiments of the invention shown in the drawings will be described below.

先端をエンジンの排気孔に連結した左右の排気
管１の尾端を偏平に変形２させると共に、互に内
側に折曲げ３する。プレマフラ４は鋼板で薄い筐
形に成形したもので、プレマフラ４の前端左右に
左右の排気管１の尾端の変形２した部分を挿入
し、左右の排気管１の尾端が前後に並ぶようにし
て固着する。そしてプレマフラ４の後端左右に左
右のマフラ５の先端を連結する。マフラ５は筒形
に長く形成したもので、オートバイの後部下部左
右に沿つて後方に伸びている。６はエンジンケー
スを示したものである。 The tail ends of left and right exhaust pipes 1 whose tips are connected to exhaust holes of an engine are deformed 2 into flat shapes and bent 3 inwardly. The pre-muffler 4 is formed from a steel plate into a thin housing shape, and the deformed portions of the tail ends of the left and right exhaust pipes 1 are inserted into the left and right front ends of the pre-muffler 4, so that the tail ends of the left and right exhaust pipes 1 are lined up front and rear. Make it stick. Then, the tips of the left and right mufflers 5 are connected to the left and right rear ends of the pre-muffler 4. The muffler 5 is formed into a long cylindrical shape and extends rearward along the left and right sides of the lower rear portion of the motorcycle. 6 shows the engine case.

作用について説明するエンジンの排気ガスは左右の排気管１を通つて
プレマフラ４内に入り一次膨脹する。そしてプレ
マフラ４から左右のマフラ５に分流して流れ、マ
フラ５内で消音され、マフラ５の後端から大気中
に放出される。而して本考案は左右の排気管１の
尾端を偏平に変形２させ、更に、左右の排気管１
の尾端がプレマフラ４内で前後に並ぶように折曲
げ３してあるので、プレマフラ４が排気管１の太
さとほぼ同じ厚さに薄くできる。従つてプレマフ
ラ４がエンジンケース６の下部に位置してもロー
ドクリアランスが支障ない程度に大きくできる。Explanation of operation Exhaust gas from the engine passes through the left and right exhaust pipes 1, enters the pre-muffler 4, and undergoes primary expansion. Then, it flows from the pre-muffler 4 to the left and right mufflers 5, is muffled within the muffler 5, and is emitted into the atmosphere from the rear end of the muffler 5. Therefore, the present invention deforms the tail ends of the left and right exhaust pipes 1 into flat shapes 2, and furthermore, the left and right exhaust pipes 1 are
Since the tail ends of the exhaust pipes are bent 3 so as to be lined up one after the other within the pre-muffler 4, the pre-muffler 4 can be made as thin as the thickness of the exhaust pipe 1. Therefore, even if the pre-muffler 4 is located at the lower part of the engine case 6, the load clearance can be increased to the extent that there is no problem.

以上説明したように、この考案はエンジンケー
スの下側にプレマフラを設置するものにおいて、
左右の排気管の尾端を偏平に変形させると共に互
いに内側に折曲げ、プレマフラを排気管の太さと
ほゞ同じ厚さの薄い筐形に形成し、このプレマフ
ラに左右の排気管の尾端を挿入して二つの排気管
の尾端が前後に並ぶようにし、プレマフラの後端
左右に筒状のマフラの先端を連結するようにした
ので、プレマフラ内に左右の排気管の偏平に変形
した尾端が並べて配置され、プレマフラの厚さを
排気管の太さ程度に薄くすることができる。この
ためプレマフラをエンジンケースの下側に配置し
てもロードクリアランスに支障がないようにでき
る。 As explained above, this idea is for installing a pre-muffler under the engine case.
The tail ends of the left and right exhaust pipes are deformed flat and bent inward to form a pre-muffler into a thin housing shape with approximately the same thickness as the exhaust pipe, and the tail ends of the left and right exhaust pipes are attached to this pre-muffler. By inserting the two exhaust pipes so that the tail ends of the two exhaust pipes are lined up front and back, and connecting the tips of the cylindrical mufflers on the left and right rear ends of the pre-muffler, the flattened tails of the left and right exhaust pipes can be seen inside the pre-muffler. The ends are arranged side by side, and the thickness of the pre-muffler can be made as thin as the thickness of the exhaust pipe. Therefore, even if the pre-muffler is placed below the engine case, there will be no problem with road clearance.

[Brief explanation of the drawing]

図は本考案の一実施例を示し、第１図は一部横
断底面図、第２図は一部縦断側面図である。１……排気管、２……変形、３……折曲げ、４
……プレマフラ、５……マフラ。 The figures show an embodiment of the present invention, with FIG. 1 being a partially cross-sectional bottom view and FIG. 2 being a partially vertical side view. 1...Exhaust pipe, 2...Deformation, 3...Bending, 4
...Pre-muffler, 5...muffler.

Claims

[Scope of utility model registration request]

For those in which the pre-muffler is installed on the lower side of the engine case, the tail ends of the left and right exhaust pipes are deformed flat and bent inward to form the pre-muffler into a thin housing shape with approximately the same thickness as the exhaust pipe. Then, insert the tail ends of the left and right exhaust pipes into this pre-muffler so that the tail ends of the two exhaust pipes are lined up front and back.
A pre-muffler for a small engine such as a motorcycle, characterized in that the tips of a cylindrical muffler are connected to the left and right rear ends of the pre-muffler.