Title:
FLEXIBLE TUBE
Document Type and Number:
WIPO Patent Application WO/2004/059140
Kind Code:
A1
Abstract:
A flexible tube (10) provided at a downstream part of an exhaust passage of an engine (E) and constructed from an outer bellows (3) as an outer tube and an inner bellows (4) as an inner tube. A bellows (4c, 4c) of the inner bellows (4) has ridges of which height and pitch are less than those of a bellows (3c) of the outer bellows (3). A shock-absorbing space (S) where a gap (t) is formed is provided between valleys of the outer bellows (3) and ridges of the inner bellows (4). A partition (17) for partitioning an exhaust passage is provided in the inner bellows (4). The structure above enhances sound-shielding effect and limits the lowering of temperature of an exhaust gas, hastening the rise of temperature of the exhaust gas flowing into a catalytic converter to activate a catalyst. Exhaust gas-purifying characteristics are improved and gas-exhausting efficiency is improved, so that output characteristics of an engine can be improved.
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Inventors:
TAIRA MASAO (JP)
KUMASAKI MICHISADA (JP)
KUMASAKI MICHISADA (JP)
Application Number:
PCT/JP2003/016668
Publication Date:
July 15, 2004
Filing Date:
December 25, 2003
Export Citation:
Assignee:
HIROTEC CORP (JP)
TAIRA MASAO (JP)
KUMASAKI MICHISADA (JP)
TAIRA MASAO (JP)
KUMASAKI MICHISADA (JP)
International Classes:
F01N13/08; F01N13/14; F01N13/18; F16L27/12; F01N13/02; (IPC1-7): F01N7/08
Foreign References:
| JPH0634127U | 1994-05-06 | |||
| JPH08277711A | 1996-10-22 | |||
| JPH11257070A | 1999-09-21 |
Attorney, Agent or Firm:
Isono, Michizo c/o Isono International Patent Office (Sabo Kaikan Annex 7-4, Hirakawa-cho 2-chom, Chiyoda-ku Tokyo, JP)
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