US1217021A - Silencer for internal-combustion engines. - Google Patents

Description

A. LEBEDEH'.

SILENCER FOR INTERNAL COMBUSTIONENGINES.

APPLICATION FILED FEB. I5. 1916.

1,217,021. Patented Feb. 20,1917.

' 9 IIIIIIII 2 8 v which are moved at a great not diminish the power of the motor in an tion, such as will view, whereas ALEXIS LEBEDEFF, OF PETROGRAD, RUSSIA..

SILENCER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Application led February 15, 1916. Serial No. 78,474.

T0 all whom t may concern:

jBe it known that I, ALEXIS LEBEDEFF, a subject of the Emperor of Russia, residing at VVassili Ostrow, 11 line, house No. 3, Petrograd, Russia, have invented' certain new and useful Improvements in Silencers for Internal-Combustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invenenable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and figures of reference marked thereon, which form a part of this specification.

The hitherto proposed silencers or apparatuses designed to suppress the noise produced by the bustion motors do this work, as is well-known, only in a very unsatisfactory manner; nevertheleSs they absorb a considerable percent. of the power of the motor. To attain a good result with a minimum ofl power absorbed by the silencer, the same mustaproduce a rapidcooling of the hot gases and as little as possible embarrass the output of them.

Now the object of this invention is a new type of silencers for internal ,combustion motors generally and especially for those used on iying machines of any kind and motor vehicles, which silencer, being very simple in construction, does nevertheless its work with good result and, when used on aeroplanes or 'other bodies or structures, velocity, does appreciable manner.

Figure 1 of the drawings shows an embodiment of my new silencer partly in a longitudinal section and partly in a side of same and Fig. 3 a cross section on line A-B of Fig. 1.

The new silencer comprises an outer shell l of thin metal sheet, eccentrically fixed on th'e end vofithe exhaust tube 7 of the motor, an inner conical tube 2 tightly connected at its larger end to the rear end of the said shell 1and a large cylindrical pipe 5 tightly r fixed to the front end of the same shell and the rear end 4 of `which is progressively diminished in diameter to such an extent `that end of the conical tube between the same and the Vnarrower front 2 is left a slot 3, through which the annular chamber 6,

exhaust gases of internal com Fig.y 2 is a front end view formed by the said shell l, and tubes 2 and 4, communicates with the cone 2. 8 and 9 designates .metal strips by which the pipe 4.-, 5 and the cone 2 respectively are connected or suspended to the outer shell l with a view to increase thenner rigidity of the apparatus.

The outer shell 1 has preferablythe form of a cigar or grenade or generally of a body which gives the smallest possible resistance upon the air.

As appears from Figs.' '1 and 2, the exhaust gases are by the pipe 7 introduced into the in such a direction that the hot gases are induced to move along this space in a spiral travel.

When the flying machine or, generally speaking, the body supporting a silencer of the described kind is moved in the direction indicated by the arrow zz/1, the air How produced thereby around the shell the pipe 5 and cone 2 in the direction of the arrow y will, rstly, energetically cool the metallic walls and thereby also the gases circulating within the space 6 and, secondly, draw these latter through the circular slot 3 into the cone 2 and out of this latter. Experience has shown that a silencer of this kind, duly dimensioned for a given motor, works at a distinct apparatus in the direction of thearrow m without absorbing anyappreciable amount of power from the motor, and with a very good result as far as the suppressing of noise is concerned.

What I claim is:

1. AY silencer for internal combustion yengines, comprising an 'outer metallic shell, a large inner pipe tightly connected to the front endof the said shell and having a successively contracted rear end, a truncated cone tightly fixed at its large end to therear i end of the said shell and encircling with its successively contracted rear end, a truncated Y free annular space 6 of the silencery l and withinv velocity of motion of the Patented Feb. 2o, 1917.'

A annular space cone tightly fixed at its large end to the rear l xed at its large end to the rear end of the said shell and encircling with its narrowerv front end the rear end of the saidpipe so as to form a circular slot, and ymeans for eccentrically introducing into the free an.

- nularv space formed' by .the said shell, pipe and cone, the hot exhaust gases.

4. A silencer for internal combustion engines the rear end of the saidl feeding the hot exhaust gases, a large inner pipe tightly connected to the ,front end of the said shell and having a successively contracted rear end, a truncated cone tightly v ixed at its large end to the rear .end of the said shell and encircling with its narrower front end the rear end of the said pipe so as to form circular slot, and means for eccentrically introducing into the free annular space formed by the' said shell, pipe and cone, the hot exhaust gases.

ln testimony that I claim the foregoing v comprising an outer metallic shell ec- `centrically mounted uponcthe end of a tube as my inventionl I have signed' my name 1n c.

presence oi' two subscribing Witnesses.

y Witnesses:

INrNcnn, R. LOVIAGHIN.

' Anniiis LnBEnnnF.

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