US1459797A - Silencer for internal-combustion engines - Google Patents

Description

June 26, 1923. 1,459,797

c. PAROLlNl ET AL 'SILENCER FOR INTERNAL COMBUSTION ENGINES Filed Aug. 16, 1921 Inventor; .gy

Patented June 26, 1923.

UNITED STATES PATENT OFFICE.

SILENCER FOR INTERNAL-COMBUSTION ENGINES.

Application filed August 16, 1921. Serial No. 492,788.

To all whom it may concern:

Be it known that .we, CESARE PAROLINI and GUsT'Avn PERRON, both citizens of the French Republic, residin at Paris, in the Department of Seine and epublic of France, have invented certain new and useful Improvements in Silencers for Internal-Comustion Engines (for which patents have been filed as follows: France, No. 499,519, July 24, 1918; Germany (pending), filed October 28, 1919; England, No. 134,844, November 4, 1919; Belgium, No. 286,434, April 29, 1920' Switzerland, No. 89,859, April 30, 1920; .IIolland, No. 6,741, May 19,1920; Spain, No. 73,835, May 26, 1920; Italy, No. 145,530, June 30, 1920), of which the 01- lowin is a full, clear, and exact description.

This invention has'for its object to provide an improved silencer which will do away entirely with the .noise of the exhaust of internal combustion en ines.

The im roved silencer has also the advantage o being very light and of not takin too much power from the engine.

e improved silencer is characterized essentially by the combination of a large exinner casi rli g engine.

pansion chamber having verythin walls, ar ranged concentrically inside a second chamber of larger diameter.

In the'space left between the two chamhers a vacuum is established for preventing the transmission of the vibrations of the walls ofth e inner chamber into which latter the exhaust gases of the engine expand. The accompanying drawing illustrates by way of example a constructional form of the improved silencer in longitudinal section.

As shown, 1 and 1' aretwo inner casings of rather large capacity constructed of very thin metal.

2 and 2' are two outer casin'gs surroundthe casings 1 and 1' respectively.

3 is the 'pipeconnecting the engine to the '1; A being the end nearest the e other end B of the iple is closed, and its sides are pierced wit oles 7 that allow the exhaust gases to escape into the chamber 8 of the inner casing 1. 1

ipe 3' connects the chamber 8 with the mg into chamber 9;

4 is the final exhaust pipe. 6 and '5' are cocks communicating with r 9jof the inner oasin 1, the end A opening into chamber 8 and t e end B openthe outer spaces 6 and 6; they serve for producing a vacuum in the said spaces.

The operation of the improved silencer is as follows The gases exhausting from the en ine cylinders are led by the pipe 3 into the inner chamber 8.

In this chamber the gases expand and pass through the pipe 3 into the inner chamber 9 of the second outer casing 1 wherein they expand again.

After this they pass out through the pigs 4.

0 do away with the noise caused by the Vibration of the walls ofthe casings, a vacuum is formed in the outer spaces 6 and 6', whereby the exhaust is completely silenced.

The lmproved silencer does nottake any power from the engine, because the gases do not have to flow through circuitous passages in' order to escape into the atmosphere. Moreover, the improved silencer can be made very light because it can be constructed of very thin metal plates.

It is to be understood that the invention is not strictly limited to the details as described, and that the forms, proportions, dimensions, arrangements and materials may be modified at will as may be considered necessary to satisfy the requirements of practice, without .departing from the natureof the invention as herein described.

What we claim is:

1, A silencer for the exhaust of internal combustion engines, characterized by the arrangement of one or more large chambers wherein the exhaust gases are allowed to ex pand, said chambers being constructed with double walls comprising between them a space in whicha vacuum is produced.

2. A silencer for explosion engines comprising a casing havin therein an. expan-'- In testimony whereof, we afiix. oursignatures in presence of two witnesses.

. GUSTAVE PERRON.

CESARE PAROLINI.

Witnesses:

Cams Dmznr, Camus

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