Nippondenso Co., Ltd.

Yasuhiko Fukami

Shuzo Kinkori

Toshiichi Sawada

A resonator for internal combustion engines having intake and exhaust pipes connected with a cylinder of said internal combustion engines comprising resonator means for absorbing resonant noises generated in said engines, a plurality of tubular connecting members disposed between said resonator means and one of said pipes for forming a continuous passage from said one pipe to said resonator means, and switch means connected with said tubular connecting means for changing said tubular connecting members in accordance with operational conditions of said engines to absorb said noises from said engines.

Resonator for internal combustion engines

A resonator for internal combustion engines, having an enclosed chamber of predetermined volumn connected to an intake duct by a tubular connecting member which is composed of an external member and an internal member. The internal member is disposed within the external member and moved by an actuator which is controlled by an electrical signal corresponding to a resonant frequency calculated by a computer in synchronism with engine rotational speeds. The resonator thereby functions to absorb resonant noises from the engines by appropriately changing the length and/or cross-sectional area of the tubular connecting member.

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Nishikasugai, Japan

Yasuhiko Fukami