US2316527A - Combined air cleaner and silencer - Google Patents

Description

April 13, 1943. MlERAs 2,316,527

COMBINED AIR CLEANER AND SILENCER Filed 001:. 12-, 1940 3 Sheets-Sheet l zzvmvron. BY MERRITT AMIERAS I Jan, 77

ATTORNEYS April 13, 1943. M. A. Mu-IRAs COMBINED AIR CLEANER AND SILENCER Filed Oct. 12, 1940 3 Sheets-Sheet 2 I r E INVENTOR. MERRITT AMIERAS um fi w A TTORNEYS April 1 3 M. A. MIERAS 2,316,527

' CQIBINED AIR CLEANER AND SILENCER I Filed Oct. 12, 1940 3 Sheets-Sheet 3 ATTORNEY Patented Apr. 13, 1943 2,316,527 COMBINED Am CLEANER AND SILENCER Merritt A. Mieras, Redford Township, Wayne County, Mich., assignor to Industrial Wire Cloth Products Company, Wayne, Mich., a corporation of Michigan Application October 12, 1340, Serial No. 361,000

3 Claims.

The present invention relates to noise silencers for internal combustion engines and particularly to silencers for the carburetor intake of such engines.

Among the objects of the invention is to simplify the construction and adaptability of such devices.

Another object is a combined air cleaner and silencer in which the silencer portion is of unitary construction.

Another object is an air cleaner and silencer combination that is of more compact construction in its vertical dimension.

Still another object is a combined air cleaner and silencer which permits ready removal of the air cleaner portion, for the purpose of cleansing, without disturbing the resonator portion.

Other objects will readily occur to those skilled in the art upon reference to the following description and the accompanying drawings in which:

Figure 1 is a sectional view of an air cleaner and silencer on line i--l of Figure 2.

Figure 2 is a plan view of the same with a part in section.

Figure 3 is a view similar to Figure 1 but of a slightly different form of embodiment.

Figure 4 is a part plan view of the latter with a part in section.

Figure 5 is a sectional view showing still another form; and

Figure 6 is a part plan view, with a part in section, of the form shown in Figure 5.

In the drawings, in each case, the air cleaner unit is shown at the left with the silencer resonating chamber or chambers at the right, both being mounted in a hollow frame member.

The air cleaner in each form is represented as consisting of a cupped annulus ill in which is telescoped a second cupped annulus ii of lesser diameter, leaving an annular air inlet space i2. Near the bottom of member II in its side walls are provided a suiiicient number of openings, indicated at i3 and by the leg i4, and above the openings, supported by a screen it is a highly porous spongy mass of filter material it while the sump II in the bottom of cup I0 is adapted to contain a body of oil.

copending application flied by the present inventor under Serial No. 320,395, on February 23. 1940, now Patent No. 2,287,629, dated June 23, 1942, for Air cleaner.

In the several forms of the combined device shown, the air cleaner unit is identical, except that in Figure l the lower portion of the central air passage is formed by a tube 25 of meshed or other foraminous material, the lower end of which is flared or flanged as at 26, to extend outwardly under oil sump, IT, to the bottom of which it is secured. This flanged tube 25 is spaced from the bottom wall of the air cleaner structure to leave a narrow annular passage 21,

and in the space behind the screen tube 25 and flange 26 is packed a body of non-resonant sound absorbing material such as a spongy fibrous mass of vegetable or animal origin.

In the air cleaners shown in Figure 3 et seq., instead of the screen tube 25; there is used a short imperforate metal tube 30 to continue tube I! to within a short distance of the bottom plate of the cleaner, having a passage 21a.

In each of'the forms of the device the air cleaner and resonating unit are fixed in a. hollow sheet metal frame 40 made up of an upper and lower member, Al and 42 respectively, sultably flanged and fixed together at their edges. The upper member is provided with openings of such size and shape as to receive the cleaner and resonator units and the lower member is provided with a suitable opening and means 43 under the air cleaner unit for mounting upon'a carburetor inlet (not shown). Member 43 also is provided with an opening of such size and shape as to permit the resonator unit to extend through to below the frame 40.

The resonator unit indicated as a whole at 50, 50a and 50b, in the several figures, consists, in the form of Figures 1 and 2, of a cylindrical or otherwise shaped chamber 5i, within which is a second chamber 52. These two chambers do not communicate with each other but each communicates with the interior of the frame 40, the chamber 5i through a short tube 53 and the chamber 52 through a short tube 54 passing through and fixed to the walls of both chambers.

In Figures 3 and 4, the resonator unit is shown as made up of chamber Ila enclosing an inner chamber 52a, these being similar to chambers II and I2 and not directly communicating. Both chambers .5la and 52a, however,. communicate with the interior of frame 40, but, in this case, the short communicating tubes 53a and Ila are concentric. the latter being enough smaller than tube 53a to leave a space 55 providing communication between chamber Ma and frame 38.

In Figures 5 and 6, the resonator 8% is shown as a single chamber Mb communicating with frame at through a tube 53b, which extends well into the chamber.

In each of the several forms shown, since the relative vertical position of the cleaner unit and resonator unit is unimportant, the vertical position of the latter may be changed without afiecting its function. Therefore, advantage is taken of this fact to provide a more secure mounting of the combined device, by securing to the bottom of the resonator unit suitable means, such as the bracket 66 and screw 6|, by which this portion of the device may be fixed to a suitable part of the engine.

It should be noted that the unitary construction of the resonator unit provide for more aocurate tuning, in that "the size. shape, and number of the chambers may easily be varied and likewise the size and length of the communicating passages.

Further, by constructing the device substantially as shown, the cleaner unit may be easily re-' moved for cleaning without disturbing the resonator, and the overall height of the device is materially less than those in common use.

Now having described the invention and the preferred embodiment thereof, it is to be understood that said invention is to be limited, not by the specific description, but only by the scope of the claims which follow.

asi es? frame in alignment with said passage but spacedtherefrom, and a resonator unit also mounted in said frame, said hollow frame providing a means of communication between said resonator and the said air passage.

2. The combination with an elongated hollow sheet metal frame member having an air outlet passage near one end, of an air cleaner mounted in said frame and adapted to discharge air through said outlet, and a resonating unit mount ed in the other end of said frame member, the discharge of said cleaner being spaced from the frame member outlet within said member and the resonator likewise opening into said frame member.

3. In combination, a hollow sheet metal frame provided with means for mounting upon the intake of a carburetor, a resonator chamber mounted in one end portion of said frame, and means in another end portion of said frame for mounting an air cleaner, said hollow frame providing a means of communication between the resonator and the air passage of said cleaner.

MERRITI A. MIERAS.

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