Silencer and process for producing the same

Details Silencer and process for producing the same Silencer and process for producing the same

1995-04-18

1998-02-17

Dang, Khanh

Metal working

Method of mechanical manufacture

Muffler, manifold or exhaust pipe making

181228, B23P 1500

Patent

active

057180458

ABSTRACT:
A silencer includes: a porous inner pipe provided in a peripheral wall thereof with a large number of small pores; an outer pipe surrounding the porous inner pipe; a sound absorbing material incorporated in an annular clearance between the porous inner pipe and the outer pipe; and a plurality of exhaust gas expansion chambers defined in the porous inner pipe and arranged such that an exhaust gas is sequentially passed through the exhaust gas expansion chambers. The sound absorbing material is formed of a heat-resistant fiber layer which is wound around an outer peripheral surface of the porous inner pipe with a binder interposed therebetween, and an outer peripheral surface of the heat-resistant fiber layer is press-fitted to an inner peripheral surface of the outer pipe with a predetermined interference. Thus, it is possible to prevent a reduction in sound vanish effect due to the leakage and short-circuiting of an exhaust gas and a reduction in engine power performance.

REFERENCES:
patent: 4228868 (1980-10-01), Raczuk
patent: 4278147 (1981-07-01), Watanabe et al.
patent: 4598790 (1986-07-01), Vesugi et al.
patent: 5036585 (1991-08-01), Schweinfurth
patent: 5260522 (1993-11-01), Vogt et al.
patent: 5479706 (1996-01-01), Tamano et al.

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