Engine silencer

The exhaust pipe design with angled branch pipes and curved connections in the engine silencer addresses the issue of direct sound wave propagation, ensuring effective noise suppression in the resonance chamber.

JP7740573B2Active Publication Date: 2025-09-17NISSAN MOTOR CO LTD
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Patent Information

Application Number
JP2024553988
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-11-01
Publication Date
2025-09-17
Estimated Expiration
2042-11-01

AI Technical Summary

Technical Problem

Conventional engine silencers fail to effectively suppress the direct output of plane wave sound waves through the exhaust pipe, leading to a decrease in silencing effect in the resonance chambers.

Method used

The exhaust pipe design includes a main pipe with a branch pipe that diverges at a branching section, where the axis directions of the branch pipe at the outlet and inlet are angled differently, and the main pipe is connected to a resonance chamber, with the branch pipe curving to prevent direct sound wave propagation into the branch pipe.

Benefits of technology

This design enhances the silencing effect in the resonance chamber by directing sound waves into the resonance chamber, reducing noise output and maintaining effective noise suppression.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides a muffling device (1) for an engine, comprising an exhaust pipe(10) which includes a main pipe (11) into which exhaust gas from an engine is introduced through a base end (E1) thereof and a branch pipe (12) branched from the main pipe (11) at a branch part (B), and a muffler (20) which includes a resonance chamber (21), wherein a second pipe axial direction (D2) of the main pipe (11) at the exit of the branch part (B) is along a first pipe axial direction (D1) of the main pipe (11) at the entrance of the branch part (B), a third pipe axial direction (D3) of the branch pipe (12) at the exit of the branch part (B) is different from the first pipe axial direction (D1), and the front end (E2) of the main pipe (11) is connected to the resonance chamber (21).
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Citation Information

Patent Citations

  • bed

    JP1991045208A

  • Control type muffling device

    JP1995332057A

  • Exhaust silencer

    JP2017190679A