US2691426A - Air cleaner and intake silencer unit - Google Patents

Description

Oct. 12, 1954 Filed July 19, 1952 J. B. SEBOK ET AL AIR CLEANER AND INTAKE SILENCER UNIT 3 Sheets-Sheet l l l W I 1 .ITZ VE 'ITIZLE T5 c/bse ofz B. Sebok T1" 121 56(901: w I/% Z i155 Qcfi. 12, 1954 J. 550 ET AL ZfiQiAZG AIR CLEANER AND INTAKE SILENCER UNIT Filed July 19, 1952 5 Sheets-Sheet 2 F .4 q. 5 Zou Evy-E. 11' TE :75

Jase 9h B. Sebolc Fr'le Sebolt Oct. 12, 1954 J 5, 555cm ETAL 2,691,426

AIR CLEANER AND INTAKE SILENCER UNIT Filed July 19, 1952 3 Sheets-Sheet I5 IZVJ/ETIZZ: T5

Ubsep/z B. Saba/z Patented Oct. 12, 1954 AIR CLEANER AND INTAKE SILENCER UNIT Joseph B. Sebok and Frank Sebok, Detroit, Mich, assignors to Houdailie-Hershey Corporation, Detroit, Mich., a corporation of Michigan Application July 19, 1952, Serial No. 299,814.

Claims. 1

This invention relates to improvements in an air cleaner and intake silencer unit of the character highly desirable for use in connection with a carburetor air intake horn, the carburetor being associated with an automotive internal combustion engine, although the unit will have other uses and purposes and may be associated with other apparatus, as will be apparent to one skilled in the art.

In connection with automotive air cleaner and intake silencer units, difliculty has been experienced in properly silencing the fundamental tone of an engine, commonly referred to as power roar, especially since the hoods of automobiles have been lowered, with the necessary increase in diameter of the cleaner and silencer unit to provide adequate volume in the silencer chamber. This particular problem was aggravated when it became necessary to make a cleaner greater than 8 inches in diameter. Usually the bottom of the casing partially enclosed the larger attenuating chamber for the fundamental tone of the engine. This bottom portion of the unit therefore became, in effect, a drum head for unexpected engine noises such as valve knock, piston slap, or noises made by the valve guides or other associated parts, which unexpected noises were frequently in the neighborhood of 900 cycles per second, while the fundamental engine tone was in the neighborhood of 120 cycles per second. Consequently, with the cleaner and silencer unit on the carburetor intake horn, many times there was more noise than if the cleaner and silencer unit had been left off. The problem was further aggravated when it became necessary to have not only an attenuating chamber for the fundamental tone, but also another attenuating chamber for another engine tone, such as a supplementary tone or a harmonic. In that event there were two parts of the casing acting in the manner of drum heads. This was particularly the case in the larger sized cleaner and silencer units, and at the present time certain automobiles are utilizing cleaner and silencer units as high as 18 inches in diameter.

It was discovered that the adverse efiect of the unexpected engine noises on these larger type units could be eliminated by preventing metal-tometal contact continuation between the portion of a unit defining a part of an attenuating chamber and the carburetor air intake horn. However, in no instance of which we are aware, has anyone been successful in eliminating such metal-tometal contact between two different bottom portions. or partitions and the carburetor intake horn without permitting the partitions or walls to vibrate and thus cause an objectionable frequency of their own.

It has been ascertained, that with the high compression engines now being almost universally adopted in the automotive field, vibration of the bottom of a cleaner and silencer unit and a parti tion defining an attenuating chamber of less volume for sounds of higher frequency would result, and that vibration causes these component parts to set up an objectionable frequency of their own, interfering with the desideratum of silencing. These component parts must be connected together or dampened in some manner to offset the undesirable effects of vibration.

With the foregoing in mind, it is an important object of the instant invention to provide an air cleaner and silencer unit in which wall portions at least partially defining separate sound attenuating chambers are all maintained out of metalto-metal continuity with the carburetor intake horn with which the air cleaner may be associated.

Another object of the invention is the provision of an air cleaner and silencer unit in which partitions or walls at least partially defining attenuating chambers are not only maintained out of metal-to-metal continuity with a carburetor air intake horn, but are also dampened to eliminate vibration.

Also a feature of the invention is to provide a silencer unit having a plurality of sound attenuating chambers, with the wall portions of adjacent chambers in effect tied together by shock absorbing means.

Still a further feature of the invention resides in the provision of an air cleaner and intake silencer unit in which the filter holding shell is maintained out of direct contact with the means therebelow defining a chamber or sump for cleansing liquid, and the partitions or walls defining the attenuating chambers are maintained out of metal-to-metal continuity with the intake horn of the device receiving clean air.

It is also a feature of this invention to provide an air cleaner and intake silencer unit comprising separable casing sections, as well as separate sound attenuating chambers, with the component parts of those sections and the walls of such chambers being dampened against vibration and metal-to-metal contact or continuity being eliminated between the silencer chamber walls and an air intake horn to which the unit is connected.

It is a further object of this invention to provide. a new and novel dampening element for use 3 in connection with air cleaner and intake silencer units.

While some of the more salient features, characteristics and advantages of the instant invention have been above pointed out, others will become apparent from the following disclosures taken in conjunction with the accompanying drawings, in which- Figure l is a part central vertical sectional, and part side elevational view of an air cleaner and intake silencing unit embodying principles of the instant invention;

Figure 2 is a greatly enlarged fragmentary vertical sectional showing through the dampening element and associated parts, this being an enlargement of the lower right central portion of Fig. 1;

Figure 3 is a greatly enlarged fragmentary vertical sectional view illustrating resilient means for seating the filter holding shell, this figure being an enlargement of the right central portion of Fig. 1;

Figure 4 is a fragmentary plan view, with parts omitted, illustrating the dampening element;

Figure 5 is a view similar in character to Fig. 2, but illustrating diagrammatically the manner of mounting the dampening element in operative position;

Figure 6 is a side elevational view of a dampening element in the form of a ring;

Figure '7 is a plan view of a dampening element in the form of a strip; and

Figure 8 is a side elevational view of the structure of Fig. 7.

As shown on the drawings:

In the illustrated embodiment of the instant invention there is shown an air cleaning and intake silencing unit comprising a pair of separable casing sections, the upper being indicated generally by numeral 8, and the lower generally by numeral 2.

The upper section l embodies a cover 3, a filter holding shell 5 secured to the cover, a generally cylindrical element 5 inside the shell 4 forming an outlet conduit from a filter element 6 contained between the shell 4 and the conduit 5. This filter mass may be of any suitable material, such as curled cattle tail hair, vegetable fiber, crimped metallic wire or ribbon, etc. The shell 3 extends across the bottom beneath the mass and is provided with large apertures I therein through which air may travel. Above the filter mass is a spider 8, secured to the cover, having one or more depending lugs 9 bearing on the upper end of the conduit 5, and holding in place against the cover a hiss silencing pad IE1. Depending from the bottom of the filter holding shell, and held thereto by the inwardly turned lower end of the conduit 5, is an annularly peaked baiiie H.

The lower casing section includes an outer wall l2 merging with a bottom lit, with the upper portion of the outer wall curving inwardly. Another partition It is shaped to define a liquid sump I5 into which the aforesaid baffle ll extends. This partition 14 has a cylindrical upwardly extending outer portion l6 concentric with the filter holding shell 4, but spaced therefrom to define therebetween a downwardly leading inlet passage i'a' .LOI' dirty air. The inner end of the partition it, is connected, as by spot welding, to the upper marginal portion of a clean air outlet conduit l8. Adjacent its connecion with this conduit, the partition i4 is shaped so as to provide a seat for a resilient gasket 19 upon which the inner portion of the bafile H as well as the outwardly turned margin of the conduit 5 may rest, as best seen in Fig. 3. With reference to this figure it will be noted that there is actually a distinct space between the lower end of the conduit 5 and the upwardly turned inner margin of the partition [4, as indicated at 20. Thus, the filter holding shell and conduit 5 are maintained out of metal-to-metal contact with the clean air outlet 18 and the partition l4, and the upper casing section is effectively dampened against vibration.

Another partition 2| is connected at one end to a part of the partition 14, and at its inner end to the aforesaid clean air outlet [8. This partition together with the partition l4 defines a sound attenuating chamber 22 operating upon the resonator principle, and access to this attenuating chamber is through a series of openings 23 in the side of the outlet conduit l8. This attenuating chamber 22 is of relatively small volume, and is designed to attenuate a sound of relatively high frequency.

The partition 2i, and the upper portion 16 of the partition I l together with the casing wall 12 and bottom [3 define a relatively large attenuating chamber 24 which is sized to neutralize the fundamental tone of the engine, a sound of lower frequency, and of course the attenuating chamber 4 is of relatively great volume. Entrance for sound to the attenuating chamber 4 is by way of a passage 25 between the outlet conduit I8 and a tube 26 to the outside of which is connected a depending ring 2! for attachment to an air intake horn such as that on a carburetor for an internal combustion engine. It will be noted that the ring 21' is stepped as at 23 to provide an annular shoulder upon which a dampening element 29 may seat.

With reference more particularly to Fig. 2, it will be seen that the dampening element 29 is provided with a groove 30 into which an inward radially extending flange 31 on the upper end of the bottom 13 is seated. The dampening element has an annular bead at its lower outer corner as indicated at 32, which is definitely disposed between the bottom l3 and the ring 23' so that these parts can never be in metal-tometal contact with each other. The dampening element 29 is preferably made of resilient material, such as synthetic rubber, and is in the form of a band circumscribing the upper portion of the ring 21. At periodic intervals around this band projections 33 are provided, there being three such in the illustrated instance. These projections extend outwardly, and downwardly over the upper portion of the bottom 53 as clearly seen in Fig. 2. The outward and upward extension of the projections affords a seat for the partition 2! outside its connection with the clean air outlet conduit 18, thereby eliminating any chance of vibration of the partition 2i and the development of an objectionable frequency by that partition. It will be noted that the same dampening element not only supports the bottom out of metal-to-metal continuity with the air intake horn, but also dampens any vibrations in either the bottom l3 or the partition 21 insuring proper and adequate silencing.

In Fig. 5 we have illustrated the mounting of the dampening element 29, this element is first disposed around the upper portion of the ring 21 on the seat 28, and the bottom l3 may have its flange 3| entered into the groove in the dampening element. At this stage of the structure, the upper portion 26a of the tube 26 is vertical as seen in this figure, and then the parts may be rigidly held and the upper end 26a of the tube is rolled outwardly over the upper margin of the dampening element to the dotted line position seen in Fig. 5, whereupon the dampening element is firmly secured in position and the bottom It is firmly mounted.

Between the lower portion of the ring 21 and the part of the tube 26 extending below the seat 28, another gasket 34 may be positioned to rest upon the upper end of the air intake horn with which the cleaner is associated.

Now with reference to Figs. 6, 7 and 8, it will be seen that the dampening element or band 2Q may be initially in the form of a ring 35, or in the form of a strip 36 as seen in Figs. 7 and 8. The ring may easily be slipped over the top of the ring 27, and the band may be easily wound around that ring 21, so the resultant eflfect is the same, whether the ring or the strip is utilized. It will be noted that in both cases, before the band is applied around the upper portion of the ring 21, the groove 30 is more expanded, and when the upper portion of the tube 26a is rolled outwardly over the top of the band 29, the groove is compressed into closed position as seen in Fig. 2.

From the foregoing, it will be seen that with the structure embodied in the instant air cleaner and intake silencing unit, the filter holding shell is maintained out of metal-to-metal contact with the partition [4 by the gasket l9, and the dampening element 29 effectively eliminates metal-tometal contact between the bottom I3 of the unit and the air intake horn with Which the unit is connected, and this same element also bears forceably against the partition 2! so as to eliminate any vibration being set up therein. Accordingly, not only is the bottom of the cleaner prevented from amplifying any unexpected noises inside the engine, but the entire structure is also prevented from setting up an objectionable frequency of vibration in its internal structure so as to adversely effect the silencing of the engine tones for which the chambers 22 and 24 are sized. The entire structure is simple, economical to construct and use, and efiectively performs the desired results.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

We claim as our invention:

1. In an intake silencer unit, a casing, partition means in said casing defining sound attenuating chambers of the resonator type one of which is partially enclosed by the bottom of the casing, a tube for connection with an air intake horn extending through the bottom of said casing, a resilient band around the inner portion of said tube, the bottom of said casing being connected only to said band around said tube, and projections on said band which the partition for another attenuating chamber contacts in spaced relationship to said tube.

2. In an intake silencer unit, a casing, partition means in said casing defining sound attenuating chambers of the resonator type one of which is partially enclosed by the bottom of the casing, a tube for connection with an air intake horn extending through the bottom of said casing, a resilient band around the inner portion of said tube, the bottom of said casing being connected only to said band around said tube, projections on said band which the partition for another attenuating chamber contacts in spaced relationship to said tube, said tube having a lateral shoulder for said band to seat upon, and the inner end of said tube being rolled over the upper portion of said band inside said projections.

3. In an intake silencer unit, a casing, partition means in said casing defining sound attenuating chambers of the resonator type one of which is partially enclosed by the bottom of the casing, a tubular assembly for connection to an air intake horn, said assembly extending through the bottom of said casing, a dampening element around the upper part of said assembly, the bottom of the casing around said assembly being secured to said dampening element only, projections on the upper part of said dampening element to firmly contact one of said partition means, said projections having free portions thereon to engage the inner face of said bottom When pressed thereagainst by said contact.

4. In an air cleaning and intake silencing unit, a casing having an inlet for dirty air, an outlet tube for clean air extending through the bottom of the casing, air cleaning means between the inlet and outlet tube, partition means in the casing connected with said outlet tube, tubular means of greater size than said outlet tube disposed around said tube in completely spaced relation-- ship thereto for connection with an air intake horn, dampening means around the inner part of said tubular means, the bottom of the casing around said tubular means contacting only said dampening means, and said dampening means also contacting the next partition means thereabove while maintaining said tubular means separated from said partition means and said bottom.

5. In an air cleaning and intake silencing unit, a casing having an inlet for dirty air, an outlet tube for clean air extending through the bottom of the casing, air cleaning means between the inlet and outlet tube, partition means in the casing connected with said outlet tube, tubular means of greater size than said outlet tube disposed around said tube in completely spaced relationship thereto for connection with an air intake horn, and a resilent dampening element around the inner part of said tubular means contacting both the bottom of the casing and the next partition means thereabove and maintaining the bottom separated from said tubular means.

6. In an air cleaning and intake silencing unit, a casing having an inlet for dirty air, an outlet tube for clean air extending through the bottom of the casing, air cleaning means between the inlet and outlet tube, partition means in the casing connected with said outlet tube, tubular means of greater size than said outlet tube disposed around said tube in spaced relationship thereto for connection with an air intake horn, a resilient dampening element around the inner part of said tubular means contacting both the bottom of the casing and the next partition means thereabove and maintaining the bottom separated from said tubular means, a separable portion of said casing carrying said air cleaning means, and a resilient element on one of said partition means holding said separable casing portion out of contact with said clean air outlet tube.

7. In an air cleaning and intake silencing unit, a casing having an inlet for dirty air, an outlet tube for clean air extending through the bottom of the casing, air cleaning means between the inlet and outlet tube, partition means in the casing connected with said outlet tube, tubular means of greater size than said outlet tube disposed around said tube in spaced relationship thereto for connection with an air intake born, a resilient dampening band around the inner part of said tubular means, spaced projections on said band to firmly contact the next partition thereabove, and said projections having depending freely overhanging portions behind which the margin of the casing bottom is clamped when said contact is established.

8. In an air cleaning and intake silencing unit, a casing having an inlet for dirt air, an outlet tube for clean air extending through the bottom of the casing, air cleaning means between the inlet and outlet tube, partition means in the casing connected with said outlet tube, tubular means of greater size than said outlet tube disposed around said tube in spaced relationship thereto for connection with an air intake horn, a resilient dampening band around the inner part of said tubular means, spaced projections on said band to firmly contact the next partition thereabove, said band having a groove therein into which a marginal portion of the casing bottom extends, and said projections having freely depending portions bearing against the inner face of said bottom in the region opposite said groove.

9. In an air cleaning and intake silencing unit, a casing section having a bottom and a pair of spaced generally laterally extending partitions defining sound attenuating chambers, a removable casing section containing air cleaning means and of less diameter than the first said casing section to provide an air inlet therebetween, an outlet tube for clean air extending through the bottom of the first-named casing section and to which said partitions are connected, tubular means of greater size than said outlet tube disposed around the tube and completely spaced therefrom for connection with an air intake horn, a resilient dampening band around said tubular means, the bottom of the first said casing section being connected only to said band around the tubular means, projections on said band firmly contacting the next above partition, and other dampening means disposed between and separating said removable casing section from the other partition.

10. In an air cleaning and intake silencing unit, a casing section having a bottom and a pair of spaced generally laterally extending partitions defining sound attenuating chambers, a removable casing section containing air cleaning means and of less diameter than the first said casing section to provide an air inlet therebetween, an outlet tube for clean air extending through the bottom of the first-named casing section and to which said partitions are connected, tubular means of greater size than said outlet tube disposed around the tube and completely spaced therefrom for connection with an air intake horn, dampening means around said tubular means and firmly contacting the next above partition, the bottom of the first said casing section being connected only to said dampening means around said tubular means, and other dampening means between the removable casing section and the other partition and maintaining the casing sections separated.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,847,352 McClatchie Mar. 1, 1932 2,149,836 Brown Mar, 7, 1939 2,557,237 Sebok June 19, 1951

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