US1468398A

US1468398A - Intake silencer for internal-combustion engines

Info

Publication number: US1468398A
Application number: US602418A
Authority: US
Inventors: Reed John
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-05-06
Filing date: 1922-11-21
Publication date: 1923-09-18
Anticipated expiration: 1940-09-18

Description

Sept. 18 1923. l,468,398

J. REED INTAKE SILENCER FOR INTERNAL COMBUSTIONENGINES Original Filed May 6, 1921 Patented Sep't. 18, 1923.

UNITED sr rEs 1,468398 PATENT OFFICE;

JOHN BEED, OF COBBBIDGE-ON-TYNE, ENGLAND.

INTAKE SILENCER FOB. INTERNAL-COMBUSTION ENGIN'ES.

Original application filed lay 8, 1921, Serial '100. &67,484. Divided and tli application filed November 21, 1 922. Serial Io. 602418.

To all 'whom it may concern: i

Be it known that I, JOHN REED, a subject of the King of Great Britain, residin at 'Corbridge House,` Corbridge -on yne, Northumberland, England, have invented certain new and useful Improvements in Intake Silencers for Internal-Combustion Engines, of which'the'following is a specification.

'The present invention is a division of my patent application Serial No. 467484 filed.

Gth May, 1921, relating to silencing devices for rapidly fiowing gases. i

The object of the present, invention is to provide an improved silencing device of simple Construction whereby noises -caused by gases or air entering a chamber will be entirely obviated or so much minimized as to be negligible. The silencing device according to this invention and as hereafter described is particularly applicable for use with internal combustion engines, and may be connected, for instance, to the carburettor of an internal combustion engine for the purpose of preventing the hissing noise caused b the infiowing air thereto.

Accor ing to this inventio an elongated enter casing of substantially equal diameter throughout its length is constructed having an openended tube entering at one end and extending to near the opposite closed end of the outer casing, the sa-d open-ended tube having series of holes formed in'its wall within thecasing, the holes towards the in ner end of the tube being larger in rea than the holes towards the enterng end of the tube; 'or alternatively the tube within the casing may be formed with a slot or slots which increase in area as they approach the innerend of the said tube. The outer casing is forined with an opening or provided with a tube connunicatng with the outer' casing adjacent to the entrance end of the aforesaid open-ended tube having the slots or holes.

In the a paratus above generally outlned accor ing to the present invention, hen entering gases are being dealt with s r instance when dealing with air passng o -a carburettor, the air ,may enter rough the exterior open end of the tube ving the graduated apertures or slots and ss to the carbnrettor by the opening or extending from the outer casing, or the 'j course may be reversed, that is the air may enter the outer casing through the' opening or ppe co'nmuncating therewith and may pass to the carburettor through the tube having the graduated apertures or slots.

The invention will be further described with reference to the examples of Construction shown on the accompanying drawings.-

the passage of the air current is reversed,-

that is the air passes into the outer casing through an aperture and finds its exit therefrom to the carburettor b the open-ended tube having the graduate slot or perfora-` t'ons.

The silencer in accordance with this invention as shown at Fig. 1 is designed for use in conjunction with the carburettor of an internal combustion engine,' the closed 'casng 1 being cylindrical in shape and formed.with an outlet pipe 6 near one end suitable for connection with the carburettor of the engine.

Through an opening in one end of the cylindrical chamber 1 and adjacent to the outlet pipe 6, &tube 4: is inserted. This tube 4, which is open at both ends, extends within the casng 1 to within a short distance of the opposite end of the .casing and forms the inlet for air passing to the carburettor. The wall of, this tube 4 within the casing is fornied with a slot 5 extending from 'its inner open end for a portion of its length the said slot increasing in area as it approaches .the said inner open'end, and the outer end of the said tube outside the casing 1 is formed with a bell mouth.

The air enters the casing through the bell mouth of the slotted tubeand finds its way partly through the graduated slot (or it may be series of holes) and partly through' the open inner end of the tube 4; to the outlet pipe 6 which is connected to the carburettor. The 'entering air in passing down the slotted tube 4 will pass through the slot 5 therein in g'adually increasing quantities and through the end of the said tube 4 to the carburettor. I

The sound Vibrations reaching the outer air, travel in the reverse direction to the entering air. As each vibration enters the slencer from the carburettor it travcls down the casing 1 of the silencer and as it does so it gradually escapes into the slotted tube 4 through the open slot 5 until it reaches the inner open end of the tube 4 when the remainder escapes through said tube 4 to the outer air. It will be seen that part of the Vibration escepes immediately to the open air through the small end of the slot 5 whilst the remainder has to travel varying distances up to twice the length of the slot 5 before eseaping, that is once up inside the casing to 'the end of the slot and back inside the inner tube. The vibrations are therefore spread out over a long period of time and thus noise is prevented. The frequency of the vihrations is very great, but by this invention with quite& short silencer it is possible to extend the time of each Vihration until it overlaps the succeeding one and thus obtain almost absolute silence.

Obviously the gases passing to the engine by way of the device, ma be oeused to pass in the direction describe or in the opposite direction if desired.

To suit certain conditions and .as shown et Figs. 2 and 3 a modified Construction of the silencer may he desirahle consisting of e cylindrical casng 1 open at one end 9 and closed at the othen A tube 4: extends within the seid casing 1 supported by radial arms 10 Fig. 3, within .the open end of the casing i, the outer end of the said tube 4 being connectcd to the air inlet of the carburettor of the engine. The inwardly projecting tube 4 is slotted or performed as before described.

lVith this Construction air will enter the open'end 9 of the casing l between the ra diel arms 10 supporting the inner slotted or perforated tube e and find its way to the earhurettor, entering partly through the slots or perforations 5 and partly through the iniier open end of the said tube 4.

The siencing action is the same es in the previous example.

Yv'het l claim as my invention and dcsire to secure by Letters Patent is: i

1. In e device for silencing repidly flowing gases entering an internal combustion engine, an elongated outer cesing of substantiaily uniform diameter throughout its length, one end of which casing is closed and the other end in communication with the induction pipe of the engine, in combi nation with a tube trzversing neni-ly the whole length of said cesing, said tube being at one end open to the atmosphere and at the other end open to the interier of said casing adjacent the closed end thereo'f, and said tube being formed with :1 slot, which slot increases in width as it approaches the inner end of said tube.

2 In a device -for silencing rapidly flowing gases entering an internal combustiou engine, an elongated cylindrical outer casing of substantielly uniform diameter throughout its length, one end of which casing is 'closed and the other end in communication with the induction pipe of the engine, in combination with a tube treversing nearly the whole length of said casing seid tube being at one end open 'to the atniosphere and at the other end open to the interier of said casing adjecent the closed end thereof, und said tube being formed with a slot which slot increases in width es it approaches the inner end of said tube.

. 3. In a device for silencing rapidly flowng gases entering :in internal eombustiou engine, an elongnted outer cnsing ot' suhstantially uniforn diameter throughout li& length, one end of which casing is closed and the other end in communication with the induotion pipe of the engine, in combinetion 'with e tuhe traversin neni-ly the whole length of seid cusing, said tube Being :it one end hell-mouthed and open to the atmosphere and at the other end open to the interior of said cesing adjecent the closed end thereof, and said 'tube being 'formed with a slot, which slot increases in width as it ;ipproeches the inner end of said tuhe.

In witness whereof I here hereunto set my hand in the presence of two witnesses.

JOHN REED.

witnesses:

FEARLEE lViNsHIP,

CISSY NIooLsoN.