US984890A - Noise-muffler for exhaust-pipes. - Google Patents

Description

D. W. DUDDERAR. NOISE MUFFLER FOB EXHAUST PIPES.

APPLIOATION FILED MAR. 31, 1910.

Patented Feb. 21, 1911.

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UNITED STATES PATENT OFFICE. v

DANIEL W. DUDDERAR, OF MOUNT AIRY, MARYLAND.

NOISE-MUFFLER FOR EXHAUST-PIPES esasao.

Specification of Letters Patent. Patented Feb. 21, 1911.

' Application filed March 31, 1910. Serial No. 552,543.

following is a specification.

This invention relates ,to a device for muffling the noise of exhaust pipes.

The object of the invention is to provide means whereby some portion of the exhaust gases of an internal combustion engine may flow through a passagedirect to the atmosphere, and other portions of the gases be first diverted into a chamber and after expanding in said chamberreturn to said direct passage where such expanded gases will serve as an elastic hindrance to retard the escape of other unexpanded gases. Thus some of the exhaust as itself is used as an elastic or yielding ba e.

Referring to the annexed drawingFigure 1 is a vertical longitudinal section of the noise mufller on the line 11 of Fig. 2. Fig. 2 is a cross-section on the line 2.2 looking downward. Fig. 3 is a View of a broken portion of the deflectingtube spread into a flat form.

The size of the'exhaust tube relative to the size of the muflier shell is indicated in thedrawing; the exhaust tube, 1,-leadin from the engine may be of any preferred size, say three inches. The outsideshell, 2, of the mufliep chamber is cylindric; this shell hasa bottom head, '3, and a top head, 4; each head may have a circumferential flange, 5, by whichit is secured to the cylindric shell, 2, and may be fastened in any approved manner. The exhaust tube, 1, may

4 be attached to the bottom head, 3, by means of a flange, 6, or any other preferred construction. The terminal or discharge end,

1", of the exhaust tube may be attached to the top head',.4=, by a collar, 7 ,or otherpre ferred construction.

It. will be seen that the exhaust tubes, 1, and, 1*, do not of themselves constitute a ,conti'nuous passage through the mufller .shell, 2..

The mufller shell, 2, contains a defliniting tube, 8, extending lengthwise of the shell and secured in concentricposition therein; the diametric size of the deflecting tube, 8', is greaterthan that of the exhaust tube, 1, and

the lowermost end of said deflecting tube where it is secured to the bottom head, 3, surrounds the opening therein where the said exhaust tube is attached.

The deflecting tube, 8, forms inside of the shell, 2, a central mixing and bafliing chant her, and also forms a space around said central chamber which space constitutes an ex-.

panding chamber, 9. The said deflecting tube, 8, is cylindric and is provided with two series of holes or ports,.10, 11; and two series of inward-projecting diver-ter tongues, 12, 13. The series of holes,.10, and inclined tongues, 12,-are formed in the upper part of the cylindric tube, 8, and these tongues all point in the direction .opposite that in which the exhausting gases are moving to escape to the atmosphere as indicated by the darts, 14. An inclined tongue, 12, is over each hole, 10. The other series of holes, 11, and tongues, 13, are in the lower part of the tube, 8, but the lower tongues, 13, are inclinedreversely with respect to the upper tongues, 12; the ends of these lower tongues all point in the same direction in which the exhaust gases are moving. Although all of the tongues project inwardly within the tube, 8, yet there is left a clear straight passage directly through the center of the tube, which clear passage has the same diameter as the exhaust tube, 1, and, 1.

The Wall of the tube, 8, may have as many rows of holes and inclined tongues as the designer may prefer. In Figs. 1 and 2 four rows are indicated; .but in Fig. 3, the broken and flattened portion, 15, is intended to show just one half of the cylindric tube and has three rows of holes and tongues. It will be observed in Fig. 3 that the holes, 10, in one vertical row are placed opposite the spaces which are between theholes in the next'adjoining rows- While such an arrangement or disposition of holes is Jde'em'ed a good one, it is obvious other arrangement of holes maybe made that will be eflective.

-The bottom head, 3, of the mufller shell.

'pipe or tube, 1, and enter the deflecting tube, 8, passing by thelower tongues, 13,.

i which point in the same direction in which expanded gases serve as an elastic baflle when they 'meet other unexpanded gases coming through the tube, 1, and the latter gases will be hindered or retarded thereby. As some portion of the gases is always free to escape to the atmosphere at the discharge tube, 1, the operation of escaping is continuous and not bypuffs. This particular operation is effective and has not heretofore to my knowledge been employed.

The operation herein described of employinf within the tube, 8, some of the expande gases to serve as an elastic bafile to retard the escape of other exhaust gases, may be produced in practical degree without having the inclined tongues, 12, and, 13, mere holes, 10, and, 11, being operative.

Having thus described my invention what I claim and desire to secure by Letters Patent is,-

l. A noise-muffler for exhaustipes having in combination a shell provi ed with a bottomand top head and an outlet in the top; a deflecting tube inside of the shell and extending lengthwise thereof and forming within the shell and around the tube an expanding chamber, and the lower end of said tube surrounding the central inlet-opening and being diametrically larger than said opening, and said tube provided with two series of ports, 10, 11, and two series of tongues, 12, 13, which incline inward1yone tongue being over each portthe series of tongues in the upper art of the said tube pointing in the direction of the said inlet-opening, and the series of tongues in the lower part pointing reversely with respect to the tongues in the upper part, all of said tongues leaving a clear, direct passage through said tube, and an exhaust pipe attached to the said bottom head around said inlet-openin 2. A noise-mu er for exhaust ipes having in combination a shell provi ed at one end with a head having a central inlet-opening to receive the exhaust gases from an engine and at its other end with a head having an outlet to the atmosphere; a tube inside of said shell and having one end communicating with the said inlet-opening and its opposite end communicating with saidoutlet to the atmosphere and forming around the tube and within the said'shell an expanding chamber,said tube provided with numerous holes communicating with said expanding chamber; and an exhaust pipe communicating directly with said inletopening, whereby some portion of the unexpanded gases may pass from the inlet-opening through said tube directly to the outlet that opens to the atmosphere, while other portions of the gases will be diverted from the inside tube through the holes therein into the expanding chamber and there expanded and then pass back into the said inside tube where they serve as an elastic baffle to momentarily retard the escape of some'portion of the unexpanded gases.

In testimony whereof I aifix my signature in presence of two witnesses.

DANIEL W. DUDDERAR. Witnesses:

S. R. CAmNs, JOHN HOWELL.

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