JPH01111120U

JPH01111120U -

Info

Publication number: JPH01111120U
Application number: JP481988U
Authority: JP
Priority date: 1988-01-18
Filing date: 1988-01-18
Publication date: 1989-07-26

Description

[Brief explanation of the drawing]

図面は本考案の実施例を示し、第１図は縦断正
面図、第２図は第１図―線断面図、第３図は
第１図―線断面図、第４図は第１図は―
線断面図である。２……ケーシング、３，４……仕切板、５，７
……端部膨張室、６……中央膨張室、８，９……
消音筒、１０……通管、１１……吸音材、１２，
１３……Ｕ型接続管、１４……内筒、１５……外
筒、１７，１８……ガス連通孔、１９……ガス流
通孔、２０……排気ガス導入管、２１……排気ガ
ス放出管、２２……吸音材層。 The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view, FIG. 2 is a cross-sectional view taken along the line of FIG. 1, FIG. ―
FIG. 2... Casing, 3, 4... Partition plate, 5, 7
...End expansion chamber, 6...Central expansion chamber, 8, 9...
Sound deadening cylinder, 10...Pipe passage, 11...Sound absorbing material, 12,
13...U-shaped connecting pipe, 14...Inner tube, 15...Outer tube, 17, 18...Gas communication hole, 19...Gas distribution hole, 20...Exhaust gas introduction pipe, 21...Exhaust gas release Pipe, 22...Sound absorbing material layer.

Claims

[Scope of utility model registration request]

The inside of the casing 2 formed in a hermetically sealed manner is divided into three expansion chambers 5, 6, and 7 by two parallel partition plates 3 and 4, and a communication pipe 10 passes between both the partition plates 3 and 4.
Expansion chambers 5, 7 located at both ends of the casing 2 at
In addition to communicating with each other, two muffling tubes 8 and 9 are arranged in parallel across both partition plates 3 and 4 in the central expansion chamber 6, and the outer peripheral surface of one of the muffling tubes 8 is covered with a sound absorbing material 11. , the other muffling cylinder 9 is constructed of a double pipe, the exhaust gas introduction pipe 20 is communicated with the muffling cylinder 8 covered with a sound absorbing material 11, and one end of both muffling cylinders 8 and 9 is connected to one of the two. The two U-shaped connecting pipes 12 and 13 arranged in the end expansion chamber 7 communicate with each other, and the U-shaped connecting pipe 12
, 13, the ends of which are made up of a double pipe.
The gas communication holes 17 and 18 are located in the inner walls of the inner cylinder 14 and the outer cylinder 15 of the double-pipe sound-reducing cylinder 9 with different protrusion amounts, and the gas communication holes 17 and 18 are arranged in different axial positions in the respective circumferential walls of the inner cylinder 14 and the outer cylinder 15 of the noise-reducing cylinder 9, which is composed of a double pipe. The inner cylinder 14 and the central expansion chamber 6 are opened to communicate with each other via the outer cylinder 15, a sound absorbing material layer 22 is provided on the inner peripheral surface of the central expansion chamber 6, and a connecting pipe is provided with the central expansion chamber 6. A muffler for an engine characterized in that a side expansion chamber 7 is communicated with a gas flow hole 19 provided through a partition plate 4, and an exhaust gas discharge pipe 21 is led out from the other end expansion chamber 5.