US1302300A - Muffler. - Google Patents

Description

L. H. BRHJKMAN.

MUFFLER.

APPLICATION FILED JAN. .1, 1913.

1,302,300. Patented Apr. 29, 1919.

WITNESSES f 'alyvzgzlk .4 TTORNEY UNITED STATES PATENT OFFICE.

LOUIS H. 3mm, OF GLEN RIDGE, NEW JERSEY, ASSIGN'OB TO TITEFLEX METAL HOSE CORPORATION, A CORPORATION OF NEW YORK.

5 New Jersey, have invented certain new and useful Improvements in Mufilers, of which the following is a specification.

The present invention relates to mufilersor sound'silencers, and while its principal use will be with internal combustion and steam-engines, it may be used for other purposes.

Complicated and expensive apparatus has been suggested heretoforeas a means of reducing the noise of the exhaust without greatly increasing the back-pressure of the engine.

For this purpose devices have been proposed for giving the products of combustion certain complex paths to accomplish the result of silencing noise and without greatly increasing the back-pressure of the engine. These devices consist of a great number of parts placed in special containers, thus making them objectionable on account of the cost of production, the difiiculties in assembling and adjustment, and their tendency to become deranged due, among other things, to the vibration of the engines. Furthermore, such devices do not properly cool the exhaust gases before permitting them to escape into the atmosphere. Their use on automobiles is unsatisfactory on account of the hard usage inherent in this class of vehicle, and, also, due to the relative movement of the engine and the point or points of support of the muflier. The above causes also combine to materially shorten the life of the mufiiels heretofore devised.

One object of the invention is to provide a mufiler which when constructed in accordance with the best form of my invention, will not only deaden the noise of the exhaust to a minimum without materially increasing the back pressure of the engine, and which is extremely simple, efficient and inexpensive, but also in which the exhaust are so cooled on their way therethrough and their pressure so reduced that there is no ganger of the gases exploding in the muf- Further objects, features and advantages will. more clearly appear from the detailed description -given: below taken in connecform a part of this specification.

Patented Apr. 29, 1919.

Application filed January 17, 1913. Serial No. 742,570.

" norms.

1,302,300, Specification of Letters Patent.

To all whom it may concern:

tion with the accompanying drawings which In the drawings,

Figure 1 illustrates an automobile wi my invention in one form, attached thereto;

Fig. 3 is an enlarged view of the end of the mufiier shown in Fig. l, partly in section; and

Figs. 2 and 4 are similar views of modified forms of mufllers.

As shown in Figs. 1 and 3 the mufller comprises a single continuous metal conduit in the form of a tube 2, which is directly connected to the engine exhaust port 1 so that the exhaust gases will pass therethrough. The tube or conduit 2 is spirally corrugated, the corrugations extending substantially from the exhaust port at the engine to'the end of the muflier where the tube is supported from the rear axle or frame mobile, as by bracket 7. A plug 3 is inserted in the outer end of the conduit and through the plug 3 extends a short tube 4 tapered on its inner end, and this inner end having perforations 5 therein through which the exhaust gases escape from the conduit 2 to the atmosphere through the tube 4. By corrugating the tube 2, folds Gare formed at an angle to the axis of the conduit which being spiral in formation give to the exhaust gases as they pass therethrough, a circular or spiral motion so that the sound of the exhaust is deadened. -Because of this spiral or circular motion and the fact that the muffler consists primarily of a unitary conduit whereby the exhaust gases are only separated from the atmosphere by a thin metallic wall, the gases are quickly cooled. This cooling not only tends to decrease the back pressure but prevents the gases from exploding in the mufiler or exhaust chambers of the engine. It is desirable'to check more or less the circular motion of the gases before 'they leave the mufiler and this is acof the auto-Q,

in the tube 11 so as to hold the latter in place and prevent it from being forced outwardly by the exhaust gases. The outer end of the tube 11 is plugged up by plug 14 so that the gases are obstructed and caused to pass between the two tubes and outside of the inner tube. The spiral corrugations of the tubes 2 and 11 run in opposite directions so that as the gases pass between them the spiral motion of the gases produced by corrugations 6 is opposed, whereby the gases leave the muflier more nearly in a straight lin %y the above arrangements the products of combustion from the exhaust ports of the engine enter the corrugated conduit, and as a result of the corrugations 6-6 they are given a whirling movement, thereby decreasing their linear velocity and the outside surfaces of the corrugations being exposed, the dissipation of heat therefrom causes a rapid cooling of the hot gases. thereby decreasing their volume and consequently the noise of the exhaust.

The corrugated conduit may extend directly from the exhaust ports of the engine to the end of the muflier, or it may compose any portion of this path, depending upon the conditions in any case.

From the above it will be clear that not only is the muflier simple, eflicient and inexpensive, but the same is composed of principally a single unitary conduit which not only deadens the noise, but rapidly cools the exhaust gases. The muflier may easily be attached directly to the exhaust ports of the engine, its low cost permitting of the doing away with intermediate connections. Furthermore, the muflier being flexible it will not be damaged, due to relative movement of the engine and those parts to which the outer end of the mufiler is connected. This flexibility also permits of the muflier being easily bent to accommodate its position to other parts of the vehicle, etc., to which it is applied.

Although I have described my improvements in great detail and with respect to one particular embodiment thereof, nevertheless I do not desire to be limited to such details except as clearly specified in the appended claims, since many changes and modifications may well be made without departing from the spirit and scope of my invention in its broader aspects.

Having thus fully and clearly described my improvements, what I claim as new and desire to sccure'by Letters Patent, is:

1. A muilier for internal combustion engines, comprising a single flexible spirally corrugated conduit extending from the ex- 3. A mufiler comprising a flexible con duit through which the exhaust gases flow, said conduit being unobstructed t rough its main portion and having a spirally corrugated passage to deaden the noise of the exhaust, and means in the outer end thereof tending to obstruct the flow of ases.

4. A muflier comprising a con uit through which the exhaust gases flow, said conduit having spiral corrugations-therein to give the exhaust gases a spiral motion, and means in the outer end thereof tending to obstruct the flow of gases thereby.

5. A mufiier comprising a conduit having a plurality of folds therein adapted to produce a circular motion of the exhaust gases, and means at the end of the conduit acting to oppose said spiral motion of the gases.

6. A muflier comprising a conduit having spiral corrugations in the wall thereof to produce a spiral motion of the gases passing therethrough, and means at the outer end of the conduit acting to oppose said spiral motion.

7. A mufiier comprising a spirally corrugated tube having a spirally corru ted tube of lesser diameter in its outer en the spirals of the inner tube running in the opposite direction to those of the outer tube, whereby the spiral motion set in the exhaust gases by the outer tube is opposed as the gases issue from the muflier.

8. A muflier comprising a conduit having an unobstructed passage through the main portion thereof and having corrugations, through which the exhaust gases are adapted to flow, the outside surfaces of the corrugations being exposed to the atmosphere to increase the dissipation of heat therefrom and thereby cool the exhaust gases to decrease their volume and consequently the 110158.

9. A muflier comprising a conduit having an unobstructed passage through the main portion thereof and having spiral corr ations for giving the exhaust gases passing therethroufgh a spiral motion, the outside surfaces 0 the corrugations being exposed to the atmosphere to increase the dissipation of heat therefrom and thereby cool the exha-ust gases to decrease their volume and consequently the noise.

10. A muflier comprising a flexible conduit' having an unobstructed passage through the main portion thereof and having spiral corrugations for giving the exhaust gases passmg therethrou h a spiral motion, the outside surfaces 0 the corrugations being exposed to theatmosphere to increase the dissipation of heat therefrom and thereby cool the exhaust gases to decrease their volume and consequently the noise, and means in the outer end of the conduit tending to obstruct the flow of gases therefrom.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribin witnesses.

L UIS H. BRINKMAN.

Witnesses:

Gonnsm CROSBY, Enwm Seem.

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