JPS6413214U

JPS6413214U -

Info

Publication number: JPS6413214U
Application number: JP10752387U
Authority: JP
Priority date: 1987-07-15
Filing date: 1987-07-15
Publication date: 1989-01-24

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る消音装置の断
面図、第２図は第１図の装置の各テールパイプ下
流端から放出される音波の波形図、第３図は第１
図の装置におけるエンジン回転数と騒音レベルと
の関係を示す特性図、第４図は第１図の装置にお
ける１／３オクターブ中心周波数と音圧レベルと
の関係を示す特性図、第５図は実開昭６０―８２
５１５号公報に開示されている排気装置の断面図
、である。１１……消音装置、１２……ケース、１３……
インレツトパイプ、１４……インナパイプ、１７
……第１の拡張室、１８……第２の拡張室、２０
，２１……テールパイプ、２２……小孔。 FIG. 1 is a sectional view of a silencer according to an embodiment of the present invention, FIG. 2 is a waveform diagram of sound waves emitted from the downstream end of each tail pipe of the device in FIG.
Figure 4 is a characteristic diagram showing the relationship between engine speed and noise level in the device shown in Figure 1. Figure 4 is a characteristic diagram showing the relationship between 1/3 octave center frequency and sound pressure level in the equipment shown in Figure 1. Jitsukai 1986-1982
FIG. 5 is a sectional view of an exhaust device disclosed in Japanese Patent No. 515. 11... Silencer, 12... Case, 13...
Inlet pipe, 14... Inner pipe, 17
...First expansion chamber, 18...Second expansion chamber, 20
, 21... tail pipe, 22... small hole.

Claims

[Scope of utility model registration request]

The closed case is divided into multiple expansion chambers,
The exhaust gas discharged from the inlet pipe into a predetermined expansion chamber is guided to another expansion chamber via an inner pipe, and the exhaust gas led to the other expansion chamber is passed through multiple tail pipes with one end open to the atmosphere. In the silencer, at least the inner pipe is disposed at a position asymmetrical with respect to the center of the case, the protruding lengths of the tail pipes from the case are the same, and the inner pipe is disposed at a position asymmetrical with respect to the center of the case, and A feature is that a plurality of small holes are bored near the upstream end of the tailpipe where it is difficult for exhaust gas flowing out of the pipe to flow in, and the actual passage lengths of the tailpipe having the small holes are made different from those of other tailpipes. Silencer.