DE1576540A1 - Air filter - Google Patents

Description

Air filter

The invention relates to air filters and is directed in particular to such types of air filters as are used for the air intake openings of the carburetors of combustion engines. Werden * -Object of the invention is to create a simple and reliable filter, the production of which can be vorgenomiuen with less cost and effort than is the case with the previously known filters of this type . . '■■ ..-.' ■

The invention proposes an air filter for this purpose, the one from two parts, namely from an actual gene use part and a Leu detachably fastened to this housing part Has existing plastic housing cover, with between A pull-out air filter cartridge is attached to these two housing parts .is used. Shape and arrangement of the housing and

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009819/0839

the cartridge are churned in such a way that when the air after the assembly of the individual parts after entry into the actual housing part enters the filter through a corresponding inlet opening, it is forced, dureii to flow through the filter cartridge and then through a corresponding outlet opening provided in the housing back out of the filter, one in Laniisrichtung running inlet pipe with the help of a snap-lock valve is attached to the inlet of the actual housing part.

Polypropylene, for example, can be used as the plastic for the manufacture of the housing, and the two housing parts can be manufactured, for example, by means of an injection molding process. The use of a two-part housing made of plastic has a number of considerable advantages compared to similar filters with an i.ictall housing. Such filter housings are particularly inexpensive to manufacture, since a thermoplastic material such as polypropylene can easily be brought into the desired shape in an injection molding process. In addition, the purpose-in are each question 'coming plastics only a low specific weight, sotJaü the finished component is lighter than a corresponding HAU> part of metal. Another advantage is that plastics also have the property of absorbing noise

BATH ORIGINAL

009819/0839

- ^ 15765AO

That is to say, there is a property (T-Ie-tiei similar} ietaU-formed not .. so that aiii housing coineral resonance devices occur. With the previously known air filters with metal housing, the oTLo.re.ii was also a longitudinal one Inlet pipe provided (which was often referred to as the dcJialldampf er o <1 e-collecting pipe) - and which was formed in one piece with the housing; the purpose of this Itohres was to provide the J.uftscinvin>, i: ii ^ en to dampen in a similar way, as already happens in the case of voltage oscillations in the inductance of a Vioohsels ti omne, tzes, ^ s irat slcii now, slack, woun the LiiVlasrohr as a separate component , made ^^ then with the help of a Schnapprastffektun ^ -am eiceiit ij dien Kirnststofi'geliiiusetcil is attached; on the one hand the iiiustci 1 ana, the Luftfiltel s thereby vvesenXlicn vei simple eight and a solclvei filter for aiidoien iti use vioiseiti ^ he is used n kaiin.

The liiiiiassrolu canoes are also made of plastic and is expediently made from the same material made from which the housing is made by itself, i.e.

for example, volypropylene. In certain cases of application in which the lineal tube of lineage exposed to high temperatures, however, it can vci '/ u / .ic'ien be able to use an outlet pipe, since “either partially

009819/08 39

or made entirely of metal. , - '<

The invention is preferably based on adjustment! Exemplary embodiments are explained in more detail with reference to the drawings. Show it:

Fig. 1 shows an axial section through the

Additional embodiment of an inventive Air filter with a plastic inlet tube;

Fig. 2 is a 'file section for visualization of the preferred attachment of the inlet pipe to the actual housing part if the air filter " according to-Fig. 1 is designed differently to the extent that the inlet pipe is made of metal and ordered

Fig. 3-5 part sections similar to Fig. 2, the

all optionally applicable fastening options illustrate of inlet tubes made of metal on the actual housing part.

1 shows an air filter with a two-part housing made of polypropylene, which overall consists of a flat housing shell 1 and a cover L.

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1576I40

The cover and housing shell are releasably attached to one another, as will be described in detail below, and they enclose an air filter cartridge 3 in the shape of a ring, which preferably has the shape described in British patent specification 751 655 and in which a ring structure made of folded paper is used as the filter material, which is held and embedded at the end in an impermeable elastomer / plastic closure. The front closures k are each provided with internal seals 5 that are firmly connected to them on the inner side, in order to improve the seal with respect to the two housing parts and 2.

The bottom 6 of the housing shell 1 is essentially shell-shaped and has an inwardly directed · Ribs or indentations 7 are provided, which contribute to holding the filter cartridge 3. The indentation 7 then goes into a centrally arranged filter outlet pipe 8, which can be connected to the air intake opening of a carburetor. The inner retaining flange 9 of the Aüölassiohres 8 serves to securely hold and fasten a sealing ring 10, which ensures an effective seal between the outlet pipe and the air intake opening of the carburetor 1st. In the upwardly directed wall part 11 the housing shell 1 is a nozzle 12 for the filter

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inflowing air is provided, which ends with a conically tapering upper edge 13 uninentrally above a circumferential recess 1h and a small retaining flange 15.

The housing cover 2 is also essentially designed in the form of a shell and has in the center an inwardly imprinted area 16 formed in one piece therewith, which also serves to hold the filter cartridge 3 in place. In addition, the cover is stranded with a snap-on rim 17, which is seen at 16 with an indentation which in turn serves to receive the tapered upper dog 13 of the lower housing part 1. At the lowermost Itandkante- 19 of the If and es 17 an arcuately inwardly curved attachment or the like is provided, which extends over the outside of the conically tapering Ifnndes. 13 of the lower housing part 1 pushes, * when the housing cover is pressed down with force onto the lower housing part, so that the approach located on the lower edge 19 engages in the circumferential recess or indentation 1Ί on the lower housing part. As soon as the cover 2 with the lower housing part 1 is snapped together t ₇ , as can be seen, the seals 5 of the filter cartridge 3 are somewhat compressed and pressed against their bearing surfaces, which through the cover and the lower housing part around the

00981970839 BÄDORsaiNÄL ^> ⁷ "

indented central area l6 of the housing cover and around the indentation 7 of the lower housing part are formed, whereby a reliable air seal is given.

The special execution form shown in the drawing an inventive air filter i ^ sl in particular to be attached to a carburettor, to which a (not shown) is permanently attached again by printing. The attachment in this case uu'tex 'is used with the help of a -Middle shaft or spigot 2.0, which sicli into the back element to see lälit. Diestsr pin 20 therefore protrudes through a central opening formed in the housing 2 and is provided with a wing nut 21 and a seal 22, so that the air filter is easily sictier can be attached to the carburetor. That through the tenon and the assembly formed by the wing nut also provides also represents an additional device with the help of which

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the lower housing part 1 and the 'Gchaus-edeckel 2 detachable can be attached to each other, of course for other purposes as well die.Possibility to either use the two housing parts, for example to be connected to one another by a hook and loop fastener between the two parts or else to be excluded an arrangement consisting of a * 'pin and a wing nut to meet, as it is not absolutely necessary

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both mounting and fastening options, at the same time to be provided.

The air filter is provided with an inlet tube made of plastic, which runs in the longitudinal direction and which is held by a snap-on catch on the inlet opening of the lower housing part. In the exemplary embodiment in hand, the inlet pipe 23 has a conical, tapering, generally cylindrical shape and can be made of the same polypropylene material that has already been used to manufacture the two filter housing parts. The inlet pipe 23 can be attached to the inlet extension 12 of the lower housing part 1 in such a way that. it protrudes diametrically outward from the filter axis. For this purpose, the connection piece 12 is provided with a circumferentially encircling inner recess, groove or the like 2k , which interacts with a corresponding projection or bead 25 which encircles the inlet pipe 23 at a short distance from the inner pipe end. As is also clear from the drawing, the inlet pipe 23 is connected to the extension or the extension 12 of the lower housing part 1 in such a way that the inner end of the pipe 23 is pressed so far into the housing extension using the deformation properties of the plastic until the bead or the-

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Approach 25 engages like a snap with the enispxecheuden recess 2k of the approach. An outwardly projecting flange 26 provided on the inlet pipe 23 effects proper retention in place by resting on the attachment end.

Because after the discovery, no longer in the way the procedure is that the inlet pipe is formed and shaped in one piece with a 'housing part, but that now rather, a separately designed inlet pipe is used, which is attached to the lower housing part of the two-piece trained filter housing is fastened by a snap lock, is a great relief achieved in the mold production and also the production the individual parts very much simplified. This is particularly true in the case of tapered ones Plastic inlet pipes, as shown, for example, in Fig. 1 are shown. In addition, there is also the Possibility of making pipes of different sizes and shapes for to manufacture one and the same filter housing, whereby the filter production made much more economical. 'The fact that it is, as a result, possible for one and using the same filter body construction, inlet pipes with different diameter sizes, proves also with the; Construction · »- and development work as beneficial, each in the manufacture of a for

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certain pre-combustion machines suitable special Filters are required; The air filter can now simply be connected to the engine carburetor and in the course of the development workMnlnssröhie different Size can be tried out by simply turning corresponding experimental tubes "on a lathe" and put them together one after the other with the filter housing will.

Another advantage of the separate design of the inlet pipe consists in the fact that it becomes aiTcii mö ^ J I, together with the two-part plastic housing also <? in inlet pipe to use that either in whole or in part made of metal, should this need arise. Most uses are made of polypropylene a perfectly suitable material .both .'for that Housing as well as for the inlet pipe. It has a sufficient Impact and tensile strength, is tough against most acids, against oil mist and also quite common to attack by hydrocarbons and also has very advantageous liquid ice cream properties, through which the ventilation of the engine is not insignificantly supported, while at the same time the achievement of an appealing high-gloss appearance is facilitated. This material is also suitable very excellent and without any difficulties to

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xan injection molding process, and also with 'polypropylene easily. Ambient temperatures between - 5 and 110-C awe, even if it is also exposed to any vibration phenomena at the same time. It is unlikely dall under the hood of a motor vehicle ruling and acting on such an air filter temperature exceeds the value of IiO ⁰ C and polypropylene melts at temperatures of more than 14ü ° C. Nevertheless, there are sometimes cases in which the inlet pipe is in the vicinity of a hot air iron, which takes effect above the exhaust line and in such cases the temperature of the pipe can almost approach the melting point of polypropylene. In order to take this into account, there may be cases in which the attachment of a Nictalle inlet pipe seems advisable and a metal pipe is therefore preferred to the plastic pipe. In addition, in the case of the air filters according to the invention, metal inlet pipes can easily be used which correspond in every drawing to the Ilo.hr shown in FIG To allow inlet pipe and the lower part of the plastic housing. In this Zusanii.ieniuui ^ Fig. 2 - ρ each show sehewatic partial sections. through various arrangements with the help of which a metal bc -

* themselves

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Inlet pipe can be attached to a housing extension similar to the nozzle 12 of FIG. 1, wherein the Other design features of the air filter naturally

r ■ * * v

correspond to the description above.

A preferred embodiment is shown in FIG. 2, in which a steel pipe 2.7 is attached to a housing inlet attachment 28, likewise made of polypropylene, with the aid of a polypropylene sleeve 29. The sleeve 29 consists of two parts, each semicircular in section and held on the inlet pipe with the help of inwardly directed lugs or lugs 30, each engaging in one of two diametrically opposite recesses 31 on the inlet pipe. If the sleeve is placed on the tube 27 immediately before being pushed into the extension 28, the tube end thus forms a cylindrical contact surface made of polypropylene, which can also be connected to the inlet extension 28 by a "snap lock, as is the case with the embodiment according to Fig 1. For this purpose, a circumferentially encircling inner groove 32 or the like is provided in the projection 23, which cooperates with a corresponding projection or bead 33, which in turn runs circumferentially around the components of the sleeve 29 that are connected to one another Correct mounting is ensured by the outwardly directed flange 3k provided on the rope, which is at the end of the.

.009819 / 0839 ^BÄD

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Approach. To 'guarantee' a correct passport ■. Seat can between the steel tube 27 and one in the ', - ■ Mlilse. 29 formed recess or a groove, a flexible sealing ring 35 can be inserted ^ ..: ': ■■ ' · ''.'■.' ■■ - ■ ''. Optionally applicable options for fastening and attaching steel pipes are shown in FIGS. 3, 4 and 5. When executing according to Pig. 3 is the tube 36 (which in this case consists of two halves which run in the longitudinal direction and have an arcuate section), soft

on opposite longitudinal flanges

f - ■ "'■

Z.0. 37 are attached to one another in such a way that the finished tube has a flattened circular or oval cross-section) is provided with an outwardly directed circumferential end flange 38 which engages in an annular recess 39 provided in the polypropylene inlet attachment 40. The same tube 36 is also shown in Figure "h overall j

shows, however, with this arrangement, the flange or lip 38 is held in a recess h% of the inlet neck k2 with the aid of a separate clamping ring 43,

in which this clamping ring from the inside of the filter -,. · "■ · '. ,' .- '■

häüses is brought to snap into place in such a way that he

the lip or flange 38 wedged against the sides of the recess 41. In the illustration according to FIG. 5, the steel inlet pipe hh is provided with a circumferential j

Rib or elevation 45 provided on the inner circumference of the ^

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free end 46 of the inlet extension 47 can be brought to bear. At the outer circumference of the end. 46 is an outwardly protruding flange 48 is provided and the inlet pipe is in this case lemiaring through an external vertical ring 49 attached, which in turn rests against the elevation or the ribbing 45 and whose edge 50 is uuigekantet in this way is that the can be slipped over the flange 48 that the clamping ring with the inlet approach to snap-lock-like engagement is brought.

BATH ORIGINAL 009819/0839

Claims (1)

PATENT CLAIMS 1. Air filter, characterized in that a two-part plastic ordering housing is provided, which consists of an actual housing part and a detachably attached to this housing part, that between these two housing parts eii ^ e removable air filter cartridge is housed and that the shape and arrangement of the housing parts and the cartridge are chosen such that after their assembly, the air entering the filter through an inlet opening in the actual housing part must flow through the filter cartridge and leave the filter through an outlet opening provided in the housing, and that a The inlet tube running in the longitudinal direction is attached to the inlet opening of the own housing part by means of a snap-in locking nut. ü. Air filter according to claim 1, characterized in that the inlet pipe is also made of a plastic. 3. Air filter according to claim 2, characterized in that daii the inlet pipe and the housing made of the same synthetic ■ - ^ NAL I ^] 009819/0839 consist of substance. ψ, i-uitfiltor according to claim 1 or 3, characterized in that that as a material for. the housing or polypropylene is used for the housing and the inlet pipe. j. Air filter according to one or more of the preceding Claims, characterized in that the inlet opening is au actual housing part in the form of a cylindrical extension formed, which in turn "fait ■ is a peripherally circumferential inner recess unintentionally, illite a corresponding circumferentially peripheral shoulder or bead on the Aussenf pool of ILinlassrohres in the manner cooperates that the inlet tube can be connected in the neck, '1a; i the end of the tube, taking advantage of the deformation properties of the plastic, is pushed into the inlet insert until the bead or ribbing provided on the inlet tube snaps into place with the corresponding, interacting recess or groove in the inlet shoulder comes into engagement. 6. Air filter according to claim 1, characterized in that the inlet pipe is made of metal. 009819/0839 7. Air filter according to claim 6, characterized in that 's the inlet opening, on the actual housing part in the form a cylindrical extension or nozzle formed and tluii the metal inlet pipe is provided with means is, with the help of which there is a snap action% can be attached in this approach or nozzle. 8. Air filter according to claim 7, characterized in that the fastening means consist of one between the tube and the approach or nozzle used two-part plastic sleeve exist, which with a circumferential outer approach Od. The like. Is provided with a corresponding circumferential side provided in the attachment or socket circumferential recess or groove like a snap-lock to Can be brought into engagement. 9. Air filter according to claim 7, characterized in that the fastening means are provided at the end of the metal inlet pipe, outwardly directed circumferentially * side circumferential lip or a splash, ü & t cooperates with a corresponding recess in the neck or socket in such a way that this lip * or the splash is either brought into engagement directly in the recess or groove like a snap lock or that the lip or the flange with the aid of a separate snap lock -JKlemmringes in this. f recess or groove is clamped. 009819/0838 " ¹⁸ ~ 10. Air filter according to claim 7 »characterized in that the fastening means consist of a raised circumferential elevation provided on the metal inlet tube and consist of an external clamp ring that starts with dea or socket is brought into engagement with a snap-lock in such a way that the elevation between the The clamping ring and the neck or nozzle come to rest and is held. 11. Air filter according to one or more of the preceding claims, characterized in that the housing parts are manufactured by means of an injection molding process. 12. Air filter according to one or more of the preceding claims, characterized in that the housing cover can be fastened by a snap lock on the lower part of the housing. 13 · Air filter according to one or more of the preceding claims, characterized in that the air filter cartridge is as described in British Patent 751,655 Has described shape and that the filter material / a filter ring made of folded porous paper is used, which is impermeable on both sides in one Elastomer plastic closure is held and embedded. 009818/0830 V ι-.