SOUNDPROOF STRUCTURE OF VEHICULAR ENGINE

PROBLEM TO BE SOLVED: To provide a soundproof structure of a vehicular engine capable of reducing high frequency noise and reducing medium to low frequency noise with an engine as a sound source thereof. SOLUTION: A noise-insulating cover 30 has a plate-like sound insulating member and a porous type...

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Bibliographic Details
Main Author OZAWA HISASHI
Format Patent
LanguageEnglish
Published 14.07.2005
Edition7
Subjects
BLASTING
COMBUSTION ENGINES
COMBUSTION ENGINES IN GENERAL
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
INTERNAL-COMBUSTION PISTON ENGINES
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
LIGHTING
MECHANICAL ENGINEERING
MOTOR VEHICLES
PERFORMING OPERATIONS
TRAILERS
TRANSPORTING
VEHICLES IN GENERAL
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a soundproof structure of a vehicular engine capable of reducing high frequency noise and reducing medium to low frequency noise with an engine as a sound source thereof. SOLUTION: A noise-insulating cover 30 has a plate-like sound insulating member and a porous type sound absorption member arranged on an inner side of the plate-like sound insulating member, and a substantially cylindrical engine room 11 with an engine 4 and a transmission 5 arranged therein is demarcated inside thereof. A resonance type sound absorbing member 18 is arranged inside the sound insulation cover 30 in a vicinity of a loop of the resonance mode 28 generated in the engine room 11 and the noise of the resonance frequency is reduced. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030431835