JPH0475125U

JPH0475125U -

Info

Publication number: JPH0475125U
Application number: JP11695190U
Authority: JP
Priority date: 1990-11-07
Filing date: 1990-11-07
Publication date: 1992-06-30
Anticipated expiration: 2005-11-07
Also published as: JPH0754574Y2

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例を示す断面図、第
２図は同非加速時の断面図、第３図は同加速時の
断面図、第４図乃至第７図は本考案におけるサブ
マフラ部の他の５実施例を示す各断面図である。
第８図乃至第１０図は従来構造の３例を示す各断
面図である。３０……サブマフラ、３１……メインマフラ、
３２……センターパイプ、３２ａ……テールパイ
プ、３３，５１ａ，５１ｂ……小孔、３６，４１
……拡張室、４４……共鳴室、５１……吸音材室
、５２……開閉バルブ、５３……アクチユエータ
、５６……バイパスパイプ。 Fig. 1 is a cross-sectional view showing the first embodiment of the present invention, Fig. 2 is a cross-sectional view of the same when not accelerated, Fig. 3 is a cross-sectional view of the same when accelerated, and Figs. FIG. 7 is a cross-sectional view showing five other embodiments of the sub-muffler section.
FIGS. 8 to 10 are sectional views showing three examples of conventional structures. 30...Sub muffler, 31...Main muffler,
32... Center pipe, 32a... Tail pipe, 33, 51a, 51b... Small hole, 36, 41
... expansion chamber, 44 ... resonance chamber, 51 ... sound absorbing material chamber, 52 ... opening/closing valve, 53 ... actuator, 56 ... bypass pipe.

Claims

[Scope of utility model registration request]

A sub-muffler 30 having an expansion chamber 36, a main muffler 31 having an expansion chamber 41 and a resonance chamber 44,
A center pipe 32 that passes through the sub muffler 30 and the main muffler 31, an on-off valve 52 that opens and closes the center pipe 32 between the sub muffler 30 and the main muffler 31, a control means that closes the on-off valve 52 when the engine is not accelerating, and a sub muffler. The center pipe 32 is connected to the expansion chamber 36 in the main muffler 30 and the expansion chamber 41 in the main muffler 31.
The small holes 33, 51a formed in the main muffler 3
1, a sound absorbing material chamber 51 formed in the center pipe 32, and a bypass pipe 56 having one end opened into the sub muffler 30 and the other end opened so as to communicate with the expansion chamber 41 of the main muffler 31. A silencer for automobiles.