Muffler

Acoustics – Sound-modifying means – Muffler – fluid conducting type

Patent

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Details

181265, 181272, F01N 306

Patent

active

041229142

ABSTRACT:
Mufflers suitable for use with automobile engines include a main body closed at the forward and rear ends thereof by forward and rear end plates, an inlet pipe leading into the main body through an aperture in the forward end plate and an outlet pipe leading out of the main body through the rear end plate. Features in accordance with the present invention contributing to muffling of engine sound are a flared end on the upstream end of the outlet pipe, a porous covering of heat-resistant material over the downstream end of the inlet pipe, short-circuit holes in at least one of the pipes, a porous partition separating the interior of the main body into forward and rear chambers, and selected ratios of the lengths of the portions of the inlet and outlet pipes within the main body.

REFERENCES:
patent: 1666257 (1928-04-01), Furnivall
patent: 3754620 (1973-08-01), Foster
patent: 4056934 (1977-11-01), Mizusawa

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