Muffler for gas-engines.

Application filed February 16,1906. Serial No. 301,362.

To all whom it may concern:

Be it known that I, Jacob B. Hoover, a citizen of the United States, residing at Columbus, m the county of Franklin and State of Ohio, have invented certain 5 new and useful Improvements m Mufflers for Gas-Engines, of which the following is a specification.

My invention relates to new and useful improve- , ments in muffl'ers for gas engines.

The object of the invention is to _ more especially designed for air cooled engines, m which air is conveyed along the exhaust pipe.

Another feature resides in rotatable means disposed within the muffler and arranged to be driven by the exhaust from the engine, with the result W a suction is 15 created which tends to draw the air so that a circula tion about the cylinder and the exhaust pipe is had.

Finally the object of the invention is to provide a device of the character described that will be.strong, durable and efficient and one in which the several parts 20 will not be liable to get out of working order.

With the above and other objects m view, the inven tion consists of the novel details of construction and operation, a preferable embodiment of which is described in the specification and illustrated in the accompany25 ing drawings, wherein: ·

Figure 1 is a longitudinal vertical sectional view of my improved muffler, also showing a portion of the exhaust pipe, and air conducting tube, Fig. is a transverse vertical sectional view taken on the line x x and 30 looking toward the exhaust pipe, and, Fig. 3 isatransFig. I, and looking toward the discharge end of the which is at each end by disk plates or heads 2 and 3. ----heAds are each formed with circular rows of openings>4 , 5 resnectively The inner head 3 is provided with end of the exhaust pipe 7 of an explosive engine (not upon -_T.

ϋ TH.«« pip. i. —«>

what larger air conducting tube 3; which is secured to the ends of the muffler by any suitable means as screws 9 The openings 5 in the head 3 are so disposed as to permit the air in the tube 8 to freely pass therethrough to the muffler casing 1. · ,

Centrally within the casing 1 a longitudinal shaft 10 is dS^ed The shaft is provided with a reduced portion U and a shoulder 12, which reduced portion passes through an opening 13 in the head 2, while the ΛοτΜζ aUts the inner side of the same, a suitable bearing being thus provided. At its opposite end the shaft is also provided with a shoulder 14 and has suitable bearing in a spider 15 which the shoulder abuts. The spider is secured at its opposite ends to the inner surface oi the 55 casing 1 by any suitable means as screws 16 passed through the casing from the outside thereof. Bypro' ion Of the shoulders end thrust and longitudinal disi is obviated, while at the same . Secured on the 60 vision of the shoulders ( placement of the shaft drawings me -----o nreferably cylindrical in shape, being closed vi· , ^Io+m nr heads 2 and 3. These tu of the inner surface of the casing are blades or packlies 17 and 18 the said blades being arranged m sets of four each, or any other suitable combination. However in the present instance, the blades 18 project from tire shatt 65 at points substantially forty-five degrees from the blades 17 the purpose of which will be hereinafter brought, out. The reduced end 11 of the shaft is extended a short distance beyond the head 2 and a fly or balance wheel 19 mounted thereon, which assists in the revolution of the paddles by the shaft. It is to be noted that the blades 17 and 18 are disposed at an angle-and inclined away from the head 3 through which the exhaust and air are admitted. ₇ =

The operation of the device is as follows: The e. haust gases from the engine enter the muffler casing and causes the shaft 10 to revolve when said gases strike against the blades 17. The.rotation ol these blades create a suction in the muffler casing which tends to draw the air from the tube 8. This tube .s connected 80 to the air jacket of the engine in the usual and w el known manner. A circulation of air is accordingly set up in said tube and about the cylinder of the engine. The air and gases after passing through the casing escape through the openings 4 in the head 2. It is o >vious that after the shaft is set in motion the momentum gained by the balance wheel 19, will material j assist in keeping up the revolution of tlie shatt. Iwisi it clearly understood that I use no manual or median- la revolving the shaft 10, but depend solely 90 the force of the exhaust gases as they strike up against the blades to revolve the same. By the provision of such a device as I have herein described, a constant circulation which is desirable in air cooled engines may be had, and without the consumption of 9& power necessary“wherea fan or the like, is use .