JPS5973518U

JPS5973518U - automotive muffler

Info

Publication number: JPS5973518U
Application number: JP16975682U
Authority: JP
Inventors: 竹井　宏文; 稲葉　元宏
Original assignee: 日産自動車株式会社
Priority date: 1982-11-09
Filing date: 1982-11-09
Publication date: 1984-05-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の自動車用マフラを示す正面断面図、第２
，３図は本考案の自動車用マフラの第１実施例を示す図
であり、第２図はその正面断面図、第３図はその消音特
性を従来のマフラと対比してエンジン回転数と騒音レベ
ルとの関係で示すグラフ、第４〜７図は本考案の自動車
用マフラの第２実施例を示す図であり、第４図はその正
面断面図、第５図はコブトロールユニットから制御弁に
入力されるパルス信号を示す図、第６図はその負圧弁の
エンジン回転数に対する開弁時間を示すグラフ、第７図
はその消音特性を従来のマフラと対比してエンジン回転
数と騒音レベルとの関係で示すグラフ、第８〜１０図は
本考案の自動車用マフラの第３実施例を示す図であり、
第８図はその正面断面図、第９図はそのサーボバルブの
正面拡大断面図、第１０図はそのコントロールユニット
からサーボバルブに入力される界磁電流の変化をエンジ
ン回転数との関係で示すグラフである。２１・・・・・・外筒、２６．６１・・間第１室、２７
゜６５・・・・・・第２室、２８．６２・・間第３室、
３２゜６９・・・・・・排甥導入管、３３・・・・・・
排気放出管、３４・・・・・・小孔、３６・・・・・・
第２頸管（連通管）、３８゜６６・・・・・・導管、３
９・・・・・・負圧弁、４７．７１・・曲制御弁。ＦＪＩ弁蒋間ｉｌミー一エンヅン回狐叡−ＣｒＰλノ゛第７図＋＋ｏｆ　　　−’Ｈ？−−１８８、エフ　；　ン目＊：ｆ＜　　　　　””’−一斗２ヅ乞
泗準４１炙（−一」閣我Figure 1 is a front sectional view showing a conventional automobile muffler;
, 3 are diagrams showing the first embodiment of the automotive muffler of the present invention, FIG. 2 is a front sectional view thereof, and FIG. 3 is a comparison of its silencing characteristics with a conventional muffler, and the relationship between engine speed and noise. Graphs showing the relationship with the level, Figures 4 to 7 are diagrams showing the second embodiment of the automotive muffler of the present invention, Figure 4 is a front sectional view thereof, and Figure 5 is a control valve from the Kobutroll unit. Figure 6 is a graph showing the opening time of the negative pressure valve against the engine speed, and Figure 7 is a graph showing the muffler's silencing characteristics compared to a conventional muffler, and the engine speed and noise level. Graphs shown in FIGS. 8 to 10 are diagrams showing the third embodiment of the automobile muffler of the present invention,
Fig. 8 is a front sectional view of the servo valve, Fig. 9 is an enlarged front sectional view of the servo valve, and Fig. 10 shows changes in the field current input from the control unit to the servo valve in relation to engine speed. It is a graph. 21...Outer cylinder, 26.61...First chamber, 27
゜65...2nd room, 28.62...3rd room,
32゜69... Exhaust tube, 33...
Exhaust discharge pipe, 34...Small hole, 36...
2nd cervical canal (communicating canal), 38°66... conduit, 3
9... Negative pressure valve, 47.71... Curved control valve. FJI Benchima Il Miichienzun Kaifuei-CrPλノ゛Figure 7++of-'H? --188, F; nth*:f<""'-Itto 2ㅅGobashi Jun 41 Roasted (-1) Kakuga

Claims

[Scope of utility model registration request]

an outer cylinder having a first chamber, a second chamber, and a third chamber defined therein; an exhaust introduction pipe having one end communicating with the engine and the other end opening into the first chamber; and the first chamber and the third chamber. A communication pipe that communicates the chambers, and a plurality of small holes that penetrate the outer cylinder and communicate with the exhaust introduction pipe at one end and open to the outside air at the other end, and communicate with the second chamber. an exhaust discharge pipe, a conduit that communicates the second chamber with at least one of the first chamber and the third chamber, and a negative pressure valve that opens and closes the conduit depending on the magnitude of the negative pressure;
A muffler for an automobile, comprising: a control valve that is interposed between the negative pressure valve and a negative pressure source and controls negative pressure introduced into the negative pressure valve based on the operating state of the engine.