US 2076827 A
Description (OCR text may contain errors)
April 13, 1937. R. w. ROSS EXHAUST MUFFLER Filed April 21, 1956 2 Sheets-Sheet l INVENTOR RUTH WARREN 9055 ATTORNEY April 13, 1937.
R. W. ROSS EXHAUST MUFFLER Filed April 21, 1956 2 Sheets-Sheet 2 INVENTOR RUTH WARREN R055 W ATTORNEY Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE Ap lication April 21,
This invention relates to improvements in mufflers for the exhaust gases of internal combustion engines and deals more particularly to that type of device which employs exhaust gas impelled means for reducing back pressure within the muffler.
The invention contemplates the provision of an improved form of muffler in which a plurality of fans, each associated with a gas deflector, are
positioned within a casing or housing in a manner to provide a series of chambers of progressively increasing volume whereby the exhaust gases are in continuous expansion upon entrance into said casing.
The invention also contemplates the provision of an increasingly tapered mufiler casing for enhancing the expansibility of the exhaust gases therein.
Another feature of the invention resides in the provision of gas impelled wheels or fans, each member being adapted for rotation in a direction opposite to an adjacent wheel or fan.
With the above objects, advantages and features in mind, and others hereinafter disclosed, the invention resides in the novel combination and arrangement of the parts as hereinafter described, said description being based on the accompanying drawings for part of this disclosure.
In the drawings, which are illustrative only:
Fig. 1 is a longitudinal sectional view of a preferred form of muffler.
Fig. 2 is an enlarged transverse sectional view as taken on the line 22 of Figure 1.
Figs. 3 and 4 are respectively similar views of an alternate preferred form of the invention.
Referring to the drawings in greater detail, the mufiler generally comprises a shell or casing Ill, an intake head II and an exhaust head I2 at opposite ends of the shell. In the present instance, it is preferred to taper the shell ID from a relatively small diameter at the intake head to a relatively greater diameter at the exhaust head.
Divers means may be employed for retaining the muffler heads in assembly. However, a preferred means for accomplishing this, is to provide a plurality of longitudinal stay wires I3 for holding said heads in non-displaceable position.
The heads II and I2 are preferably conically formed as shown so the gases entering the muffler may not become lodged in blind pockets.
Since the invention contemplates the transition of exhaust gases through the mufiler in as smooth a manner as possible, the entire design of the casing and heads are along streamline lines as shown.
1936, Serial No. 75,536
The gas impelled devices, in the form of fans l4, I5 and I6 are preferably placed athwart the muffler, the fan I4, nearest the intake head being smallest, and the fan I6, nearest the exhaust head being largest. Also, the fans I4 and 15 are placed relatively near each other to provide a relatively small expansion chamber ll, while the fans I5 and I6 are somewhat further apart to form a relatively larger expansion chamber I8 and finally the fan I6 is positioned in relation to the exhaust head l2 to form the largest expansion chamber [9, the three expansion chambers, in this manner, being successively located in progressively larger portions of the shell Ill.
Each fan is mounted by means of a pivot pin 20, in bearing blocks 2 I, each fixedly held in a bracket or stanchion 22. A preferred means, for holding the bearing blocks in adjusted position, comprises slitting a. portion of each stanchion as at 23 and providing a clamp screw 24 for urging d the free portion of the clamp thus formed towards the rigid portion.
To facilitate mounting the stanchions within the shell I 0, they are first preferably mounted on rails 25 which may then be secured as by welding to said shell.
The fans l4, I5 and I6 are each associated with a deflector, respectively designated 26, 2'! and 28 and arranged in front of each respective fan for the purpose of deflecting the oncoming gases to the more efficient portions of the fans.
While all the several fans may be arranged to be rotated in the same direction, it is preferred to have the center fan I5 rotate in a direction opposite to that of the other two fans to afford greater turbulence to the gases in their passage through the muffler casing.
From the foregoing it may be seen that the exhaust gases, in passing through the muffler,
are first deflected by the deflector 26 towards the walls of the shell and their substantially straight through motion is translated into a swirling motion by reaction from the blades of the fan M. The swirling gases in the chamber I! are then deflected by the deflector 21 before acting on and being motivated by the fan I 5, but in this instance the gas particles are further agitated by the reverse rotation of said latter fan. The gases in the chamber I8, now in a great state of turbulence, may expand in this larger chamber before passing by the deflector 28 and fan I6 for further swirling etc. The gases finally discharge into the chamber I9 where further expansion is afforded before passing into atmosphere through the exhaust head I2.
In this manner, not only is the noise of explosion effectively muffled, but back pressure of the exhaust gases is entirely eliminated, hence improving the efficiency and reducing the fuel consumption of an internal combustion engine.
While it is preferred to taper the mufiler shell as shown, good results may be attained by employing a cylindrical shell with the progressively increasing expansion chambers as described.
Another manner of accomplishing the desired results is shown in Figures 3 and 4, wherein the middle fan 15 is positioned to one side of the center line of the mufiler, and the other fans I l and l8 are positioned to the other side of the center line, with the respective deflectors 26 2! and 28 each located on the center of rotation of the fans, and as so arranged they will impose a circuitous route upon the products of combustion passing through the casing and thus attain the usual mufiiing action upon said products.
More or less fans and deflectors may be employed and other changes in the arrangement of the parts may be made within the meaning of this disclosure.
What I claim as new and desire to secure by Letters Patent, is:
1. A muffler comprising a casing having intake and exhaust heads, and at least two fans rotatably mounted in said casing and so spaced from the heads and from each other that increasingly larger chambers are formed between the intake head and the first fan, between the first fan and the second fan, and between the second fan and the exhaust head, and one of said fans being out of axial alignment with respect to one of the other fans.
2. A muiiler comprising a casing having intake and exhaust heads, said casing being increasingly tapered towards said exhaust head and two or more fans rotatably mounted in said casing in non-axial alignment.
3. A mufiier comprising a casing, said casing being increasingly tapered from its intake end towards its exhaust end, one or more fans rotatably mounted in said casing, and one or more deflectors axially arranged in front of said fan or fans, at least one of said fans and deflectors being non-axial with said other fan or fans.
4. A muiller comprising a casing, said casing being increasingly tapered from its intake end towards its exhaust end, one or more fans rotatably mounted in said casing, and one or more deflectors axially arranged in front of said fan or fans, the centers of said fans spaced from the center line of said casing.
RUTH WARREN ROSS.