Flexible tube

Details Flexible tube Flexible tube

2003-12-25

2008-11-18

Brinson, Patrick F (Department: 3754)

Pipes and tubular conduits

Flexible

C138S119000, C138S120000, C138S148000, C285S300000, C285S145500, C285S145400, C285S903000

Reexamination Certificate

active

07451785

ABSTRACT:
A flexible tube10of the present invention is disposed downstream of a exhaust path from an engine E, and formed of an outer bellows3as an outer tube and an inner bellows4as an inner tube; pleats4c,4cof the inner bellows4are smaller in depth and pitch than the pleats3cof the outer bellows3,and the buffering space S is provided with a gap t between the pleats bottoms of the outer bellows3and the pleats tops of the inner bellows4,and further, a partition17that splits the exhaust path is disposed in the inner bellows4.For this reason, sound insulation effect is improved, and the lowering of the temperature of the exhaust gas is suppressed, leading to quick temperature rise of the exhaust gas to be fed into the catalytic converter, thereby promoting the activation of the catalysts and improving the capability to purify exhaust gas, and the exhaust efficiency can be improved thereby increasing output performance of the engine.

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