DE102016011451A1 - An interior air filter, a filter assembly, and a method of installing an interior air filter - Google Patents

Abstract

Interior air filter (8) for a motor vehicle (1) for insertion into a bearing surfaces (25) for the cabin air filter (8) comprising the filter housing (7), wherein the bearing surfaces (25) specify a built-in geometry for the cabin air filter (8), wherein the cabin air filter ( 8) comprises a frame (10) and a filter medium (9), wherein the frame (10) surrounds the edge of the filter medium (9), wherein the frame (10) has an original shape in an exposed state (23) and in an inserted state (24) is braced and bendable contrary to its original shape.

Description

Technical area

The present invention relates to a filter element, in particular an interior air filter for filtering air for the interior of a vehicle or building. Furthermore, the invention relates to a filter assembly with such a filter element, in particular an interior air filter, and a filter housing. Furthermore, the invention relates to a method for attaching or obstructing a filter element, in particular an indoor air filter.

Although applicable to any filter elements and arrangements, the present invention and the underlying problems are described below for an interior air filter of a motor vehicle.

The increasing air pollution, especially in large cities, in connection with the use of modern air conditioning systems makes it necessary to clean the outside of the interior of a motor vehicle and conditioned or conditioned air by means of suitable filters. For this purpose, for example, particulate filter, odor filter or their combination with each other come into consideration, which should filter or adsorb particulate matter and odors contained in the ambient air as well as possible.

For filtering air for the interior of a motor vehicle, folded or pleated filter materials, such as filter fleeces forming a fold pack, are often used. For this purpose, an initially flat filter material sheet is folded in a zigzag shape. The fold pack is held, for example, by side bands and headbands or other frame. Such filter elements can be fixed exchangeably in a filter housing. The filter assembly thus formed may be installed in an air conditioning system of a corresponding motor vehicle.

State of the art

From the JP 2004 116804 A a pre-filter is known, which is insertable into a housing and faces a grid of the housing. At the pre-filter, two projections are arranged centrally, which bulge by co-operation with the housing, the pre-filter, wherein the pre-filter is positively received in the housing. With the help of buckling the pre-filter is clamped against the housing.

Disclosure of the invention

Against this background, the present invention has the object to provide an improved filter element, in particular an improved cabin air filter.

Accordingly, an indoor air filter for a motor vehicle is proposed for insertion into a bearing surfaces for the cabin air filter filter housing. The bearing surfaces provide a built-in geometry for the cabin air filter. The cabin air filter comprises a frame and a filter medium, wherein the frame surrounds the filter medium at the edge, wherein the frame in an exposed state has an original shape and in an inserted state can be braced and bendable against its original shape.

By the frame, which encloses the filter element, can be braced and designed bendable contrary to its original shape, a permanent clamping of the frame against the support surfaces can be realized, so that rattling due to vibrations is prevented. This elastic material behavior is used to generate restoring forces that fix the filter element. This represents a particularly cost-effective solution, since this effect can be achieved by slightly changing the shape of the cabin air filter and / or the filter housing. Furthermore, it is not absolutely necessary to bulge the filter medium excessively. The filter medium is designed in particular as a fold pack made of a zigzag folded flat filter material.

Under "exposed state" of the frame is a state of the filter element, in particular the cabin air filter, to understand in which no external forces acting on the filter element except the weight of the filter element.

Under "inserted state" of the frame is a state of the filter element, in particular of the cabin air filter, to understand, in which the filter element is inserted in the filter housing as it is provided during the permanent operation.

For example, in embodiments of the filter element, the frame is a closed frame. In alternative embodiments, the frame may also be open, in particular U-shaped, configured. For example, the frame may include plastic. Furthermore, the frame may be provided as an injection-molded component. Still further, the frame may be formed in one piece material.

In embodiments of the filter element, the frame is designed as the outermost frame of the filter element, in particular of the cabin air filter. For example, the outer edges of the frame may be a volume, in particular a Block volume, in which the filter medium can be arranged.

In embodiments, the frame is elastically braced and elastically bendable against its original shape.

The filter element comprises, for example, a filter medium and one or more side elements, in particular sidebands and / or headbands (also referred to as headbands), which stabilize the filter medium at least in sections, in order to maintain its shape, in particular in the filter operation. In embodiments, the side members form the frame.

The side elements can be connected to the filter medium on the edge cohesively, in particular glued. For this purpose, the side elements can be heated and the filter medium can be pressed into the heated material. Alternatively, the side elements may be molded onto the filter medium. Furthermore, an adhesive can be used as filler material.

The filter medium is preferably folded into a fold pack. The filter medium can be folded or wave-shaped. As convolutions zigzag or W-folds are known, for example. The filter medium can be embossed and then folded sharp-edged at embossing edges to form folding edges. As a starting material can serve a sheet material filter sheet, which is transformed accordingly. The filter medium is, for example, a filter fabric, a filter fabric or a filter fabric. In particular, the filter medium can be produced in a spunbond or meltblown process. Further, the filter medium may be felted or needled. The filter medium may include natural fibers such as cotton or synthetic fibers such as polyester, polyphenylsulfide or polytetrafluoroethylene. The fibers may be oriented in, skewed and / or transversely to the machine direction during processing. Furthermore, the filter medium may be formed, for example, as a flat medium.

The filter medium can be single or multi-layered. It may further comprise an adsorbent such as activated carbon. Furthermore, the filter medium may have an antimicrobial and / or antiallergenic effect. For example, zinc pyrithione or nanosilver can be used as the antimicrobial substance, for example polyphenol as an anti-allergenic substance.

A corresponding filter element serves to filter fluids, ie gaseous and / or liquid media, for example air. A gaseous medium or air here also includes gas or air-solid mixtures and / or gas or air-liquid mixtures. For example, an air conditioner may have the filter element.

A particularly open filter medium may be adapted to trace particles of the test dust A4 ISO 12103-1 from an air stream with a filtration speed of 0.10 to 0.30 m / s, based on the filter medium surface, with an air permeability of greater than 3000 l / m ² s (determined according to ISO 9237 at 200 Pa). The determination of the filtration characteristics can, for example, according to DIN 71460-1 respectively.

A particularly highly separating filter medium can be adapted to after particles of the test dust A2 after ISO 12103-1 and NaCl aerosol particles according to DIN 71460-1 from an air stream with a filtration speed of 0.10 to 0.30 m / s, based on the filter medium surface, with an air permeability of greater than 600 l / m ² s (determined according to ISO 9237 at 200 Pa). The determination of the filtration characteristics can, for example, according to DIN 71460-1 respectively.

The filter element may have a seal which seals a raw side associated with the filter element with respect to a clean side thereof. The seal may be identical in construction to one or more side elements of the filter element. Alternatively, the seal may be formed as an additional component. For example, the seal may be attached to the filter media, the one or more side members, the filter element, or the filter housing. For example, the seal may extend around the frame and be attached, in particular glued, to it.

The filter element can be fixed exchangeably in the filter housing.

The filter element or the filter assembly can be found in passenger cars, trucks, construction machinery, watercraft, rail vehicles, aircraft and generally in air conditioning, especially in air conditioning appliances, in household appliances, in fuel cells or in building services application. These vehicles or vehicles can be operated electrically and / or by means of fuel (in particular gasoline or diesel). In terms of building technology, in particular stationary systems for the treatment of air come into consideration.

In embodiments, the frame has at least one side element, which is curved in the exposed state arcuate and in the inserted state in the direction of larger bending radii.

"In the direction of larger bending radii" in the present case means that a side element with a bent or bent shape is deformed in the direction of a straight side element. These include hyperextensions in which the sign of the bending radius changes. The restoring forces are for example 1 to 200 N, preferably 5 to 100 N, more preferably 5 to 25 N and particularly preferably 10 to 20 N. For example, an elevation of the arcuate side element 2 to 50 mm, preferably 3 to 30 mm, particularly preferably 3 up to 10 mm. For example, the curved side element is formed as a bent beam. Alternatively, the curved side element is formed as corrugated, in particular sinusoidal, beams.

This can also be used existing filter housing, which are provided for a flat filter element. Furthermore, at least three pressure or force transmission areas can be created, so that, for example, there is a three-point bend of the side element. It can also be realized a four-point bend by means of four pressure or power transmission areas. Alternatively, it bends over more than four points or areas.

In embodiments, the frame has at least one side element, which is braced in the inserted state in the direction of smaller bending radii.

In embodiments, the frame has opposed side members that are bent about a same bending axis in the exposed state.

This has the advantage that the frame can be clamped symmetrically and at least six pressure or force transmission areas are present, so that each of the bent side elements in the inserted state undergoes, for example, a three-point bend. Preferably, a standing surface, upper side and / or lower side of the frame is present as a curved surface, in particular as a part of a cylinder jacket surface.

In embodiments, the frame includes at least four side members that are bent in the exposed state within a frame plane.

A "frame plane" herein means a plane that intersects all the page elements of the frame.

"Bend within a frame plane" means in the present case that the bending axes about which the side elements are bent, perpendicular to the frame plane. This provides a level frame relative to the frame level.

For example, all side elements are arched outwardly from the fold pack. Alternatively, all side elements to the fold pack are curved inwards. As an alternative, two opposite side elements to the fold pack are curved inwardly and two other opposing side elements are arched outwardly from the fold pack.

Alternatively, the side members of the frame could not be bent, with at least one side member having a projection extending in a direction lying within the frame plane. This would bend the side member in the installed state with the aid of the projection, which presses against the filter housing, within the frame plane. For example, two or four side elements have such a projection. Such a projection can be present on the outside or inside of the frame. For example, two opposing protrusions are provided on the inside of the frame and two other opposing protrusions on the outside of the frame, wherein the extension direction of the inside protrusions is perpendicular to the extending direction of the outside protrusions.

Advantageously, thus the tension can be realized by reducing the curvature within the frame level. Thus, the restoring forces act in the frame plane or parallel to the frame plane. For example, the filter housing has wedge elements which are adapted to clamp the curved side elements when inserted into the housing. In this case, for example, insertion bevels of the wedge elements serve to continuously bend the side elements. For example, the filter housing has four wedge elements.

In embodiments, the frame in the exposed state has straight side elements forming a frame plane.

By "straight side element" is meant in the present case an element that extends substantially in its longitudinal direction. For example, the even page element is a bar.

Thus, a planar frame is provided which is bent in the inserted state. For example, the bending of the side elements can take place about an axis which runs parallel to the frame plane, so that the restoring forces are perpendicular to the frame plane or inclined to the frame plane. Alternatively, the side members may be bent within the frame plane such that the restoring forces act in the frame plane or parallel to the frame plane.

In embodiments, the filter element, in particular the cabin air filter further comprises at least one projection which extends perpendicular to a frame plane.

This has the advantage that an unevenness can be created in a particularly simple manner, which can be used as a power transmission area for a restoring force. For example, the projection or projections are connected to the frame, for example by means of an adhesive bond. Alternatively, the frame may be injection molded together with projection or projections. For example, the projection may be cast on the frame. Furthermore, the projection is for example releasably connected to the frame or the filter medium. This can be realized for example by means of a Kletverbindung. This has the advantage that in case of using the cabin air filter in different filter housings an individual bias can be generated.

In embodiments, the filter element, in particular the cabin air filter, further comprises at least three protrusions extending in the exposed state perpendicular to the frame plane, wherein at least two protrusions extend in one direction and at least one protrusion in an opposite direction and wherein the at least three Protrusions lie in the inserted state on the filter housing, so that is clamped by means of power transmission to the at least three projections of the frame and bent against its original shape.

This has the advantage that by means of the projections, the bending forces can be introduced into the frame and the frame can be provided substantially as a standard frame without bending. For example, the frame has two opposite side elements, each having on its upper side at both ends and on its underside a central projection.

It is further proposed a filter assembly with an indoor air filter, as described above, and a filter housing, which comprises bearing surfaces for the cabin air filter. The frame and the bearing surfaces are configured such that in the inserted state of the cabin air filter is braced, so that the bearing surfaces specify a built-in geometry for the cabin air filter.

In embodiments, the filter housing has projections which, in the inserted state of the cabin air filter, form bearing surfaces for the cabin air filter and bend the frame of the cabin air filter against its original shape.

The projections press against the filter element, in particular the frame of the filter element, and bend the frame. This has the advantage that, for example, a filter element with a planar frame, in particular a standard filter, can be inserted into the filter housing. For example, the projections have the same material as the filter housing or projections and filter housings are made of the same material. The projections and the filter housing may be present as a one-piece injection-molded component, in particular plastic.

Furthermore, a method for installing an indoor air filter, as described above, proposed in a filter housing. A frame of the cabin air filter is bent by means of bearing surfaces in the filter housing against its original shape and pre-biased against the filter housing. The bending and preload is permanently set.

"Permanently fixed" means in the present case that this state is present during the operation of the filter element, in particular the cabin air filter.

There is also proposed a motor vehicle with a filter element as described above and / or a filter arrangement as described above.

The features described for the filter element apply to the filter housing, the filter assembly, the method and the motor vehicle accordingly, and vice versa.

Further possible implementations of the invention also include not explicitly mentioned combinations of features or method steps described above or below with regard to the exemplary embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

Further embodiments of the invention are the subject of the dependent claims and the embodiments of the invention described below. Furthermore, the invention will be explained in more detail by means of embodiments with reference to the accompanying figures.

Brief description of the drawings

It shows:

1 a schematic representation of a general motor vehicle with a filter assembly;

2 : A perspective view of the filter assembly 1 a filter housing having an interior air filter received therein;

3 : A perspective view of the cabin air filter 2 comprising a frame and a filter medium;

4 : in a perspective view of the filter medium 3 ;

5A in a schematic side view of the cabin air filter in the exposed state;

5B : In a schematic side view of the cabin air filter 5A when inserted;

6A in a perspective view of a frame in the exposed state;

6B : in a perspective view of the frame 6A when inserted;

7A in a schematic side view of an interior air filter with projections in the exposed state;

7B : In a schematic side view of the cabin air filter 7A when inserted;

8th : shows a plan view of a top and a bottom of the cabin air filter 7A and 7B ;

9A in a schematic side view of an interior air filter in the exposed state;

9B : In a schematic side view of the cabin air filter 9A when inserted;

10 1 shows a plan view of an interior air filter with side elements bent within a frame plane in the exposed state;

11 : shows the interior air filter in a top view 10 when inserted; and

12 in a perspective view according to a wedge element 11 ,

In the figures, identical or functionally identical elements, unless otherwise indicated, have been given the same reference numerals.

Embodiment (s) of the invention

1 shows a motor vehicle 1 with air conditioning 2 which can be designed as a heating air conditioning. The air conditioner 2 takes outside air 3 on and leads filtered air 4 a cabin 5 (Also referred to as passenger compartment) of the motor vehicle 1 to. For this purpose, the air conditioning system includes 2 one in 2 shown filter assembly 6 ,

The filter arrangement 6 includes a filter housing 7 with an interior air filter, in particular interchangeable received therein 8th , The cabin air filter 8th is in 3 shown closer. The cabin air filter 8th has a filter medium 9 on which in particular round with a frame 10 connected is. The frame 10 can for example page elements 11 . 12 . 13 . 14 include.

The filter medium 9 is in 4 shown isolated. The filter medium 9 is for example a filter fleece, filter fabric, filter fabric or filter felt, in particular a needle felt. In particular, the filter medium 9 be prepared in a meltblown process. The filter medium 9 may comprise natural fibers, such as cotton, or synthetic fibers, for example of polyester, polyphenylsulfide or polytetrafluoroethylene. The fibers may be oriented in, obliquely and / or transversely to the machine direction M during processing. Also, the fibers may be stretched in one spatial direction. The filter medium 9 can be formed in one or more layers.

The filter medium 9 can wrinkles 15 which typically extend across the machine direction M. The folded filter medium 9 is also called pleating. The wrinkles 15 can by means of folding along sharp fold edges 16 (Also referred to as pleat tips) or by a wavy design of the filter medium 9 be generated. A respective fold 15 can through two folding sections 22 be defined, which has a corresponding folding edge 16 connected to each other. According to the embodiment, the folded edges 16 in or against the direction of flow, which in 2 indicated by the arrow L. The folding can be carried out in particular as a zig-zag folding. Alternatively, the filter medium 9 be formed as a flat medium.

Also a fold in which the wrinkles 15 have a varying height H is possible. The height H is for example 1 to 7 cm, in particular 3 to 5 cm. Further, the pleat spacing between the pleats 15 vary so that the distance A1 is not equal to the distance A2. The filter medium 9 can be self-supporting, ie the wrinkles 15 are dimensionally stable at a proper flow in the filter operation.

The filter medium 9 is in the machine direction M of final folds 17 . 18 limited. Transverse to this is the filter medium 9 of pleated front edges 19 . 20 (also referred to as folding profiles) limited. By "wrinkle front edge" is meant the frontal fold surface, which is located between adjacent fold edges 16 a respective fold 15 extends.

The filter medium 9 can have a rectangular shape in the plan view, ie in the plane E2 of its planar extension. However, a triangular, pentagonal or polygonal, round or oval shape is conceivable.

In the 3 shown side elements 11 . 12 are with the fold end edges 19 . 20 , the page elements 13 . 14 with the endfolds 17 . 18 connected, in particular by fusing, verscheißen or gluing. The page elements 11 . 12 . 13 . 14 can the frame 10 form one-piece or multi-part. The page elements 11 . 12 . 13 . 14 form a frame plane E1, extending through all the page elements 11 . 12 . 13 . 14 extends. Preferably, the frame plane E1 is identical to plane E2 or to plane E2. The frame 10 can be made for example of a particular elastic material or as in particular rigid plastic injection molded components. In particular, the frame may 10 by injection molding on the filter medium 9 be generated. The page elements 11 . 12 for example, are opposite, for example, are the same length and have, for example, a length B1. The page elements 13 . 14 for example, are opposite, for example, are the same length and have, for example, a length B2. The length B1 and the length B2, for example, can be the same length. The length B1 is for example 10 to 60 cm, in particular 20 to 25 cm, and / or the length B2 is for example 10 to 60 cm, in particular 20 to 25 cm. The page elements 11 . 12 . 13 . 14 are, for example, viewed from a top view to a quadrangular frame 10 connected. For example, close the outer edges of the frame 10 a volume one in which the fold pack 9 is arranged. The volume is, for example, a cuboid volume. Alternatively, the frame 10 viewed from a plan also have a three, five, six, seven, eight or polygonal outer and / or inner contour. Furthermore, the frame 10 viewed from a top view also have a round or oval outer and / or inner contour.

The filter medium 9 can act as a particle filter while particles, especially dust, suspended solids or liquid drops, from the intake air 3 filter out. In addition, the filter medium 9 act as an odor filter. For this purpose, it may, for example, have a layer of activated carbon. The filter medium 9 may generally be adapted to adsorb or adsorb certain solid, liquid and / or gaseous substances.

In filter operation, the filter medium 9 , as in 2 shown, flows through perpendicular to its planar extent of air L. The air L flows from a raw side RO of the cabin air filter 8th towards a clean side RE of the same.

To ensure adequate sealing between the raw and clean side RO, RE, a seal between the cabin air filter 9 and the filter housing 7 be provided. For example, the seal can be in the frame 10 be integrated. In this case, the frame is 10 at least partially formed of a sealing material. Alternatively, the seal may be provided as an additional part, for example on the frame 10 attached, in particular be injected. For example, the seal may be around the frame 10 run around and connected to this, in particular glued to this, his.

5A shows the cabin air filter 8th in uncovered condition 23 , The cabin air filter 8th has a curved original shape, so that in the exposed state 23 on a level ground 21 an outer bottom edge 32 an elevation S relative to the ground 21 having. The frame 10 thus indicates a bent or kinked footprint 33 on. Alternatively, the outer lower edges could 32 rest on the ground, leaving an elevation in a central area of the frame 10 is present. This would be the case, for example, if the cabin air filter 8th turned 180 ° on the ground 21 would rest. The elevation S is for example 2 to 50 mm. The frame 10 is bent about a bending axis Z, in the direction of extension of the side members 13 . 14 runs. The footprint 33 thus has a bending radius R1 about the bending axis Z on. The radius R1 must be along the footprint 33 not be constant, but the radius R1 along the footprint 33 vary. The bending axis Z, to which the bending radius R1 is related, can be parallel to the ground 21 be moved. Preferably, the bending radius R1 along the footprint 33 the same sign. The cabin air filter 8th is suitable in a motor vehicle 1 to be used, with a filter housing 7 with bearing surfaces 25 is provided to the cabin air filter 8th take.

An inserted state 24 of the filter element 5A is in 5B shown. The bearing surfaces 25 give a built-in geometry for the cabin air filter 8th before, where the frame 10 in an exposed state 23 an original form (see 5A ) and in an inserted state 24 in particular elastically braced and bent against its original shape. The tension takes place against the bearing surfaces 25 and thus against the filter housing 7 , The frame 10 is when inserting the cabin air filter 8th in particular elastically deformed, so that the elevation S is reduced and thus restoring forces F1, F2, F3 against the housing 7 Press and the cabin air filter 8th lock, so that rattling due to shaking is prevented. The restoring forces F1, F2, F3 are offset, wherein at least two restoring forces F1, F3 act in one direction and at least one restoring force F2 in the opposite direction. This is a bend in at least three places, in particular a three-point bend, the cabin air filter 8th realized. Preferably, in the inserted state 24 the superelevation S zero and / or the footprint extends 33 parallel to the frame plane E1. For that, the frame needs 10 be bent in the direction of larger bending radii R1. Alternatively, the frame 10 be further bent so that the bending radius of the footprint 33 the sign changes (not shown). In other words, the cabin air filter becomes 8th pressed into a desired geometry and thereby bent.

In contrast to 5A show the 6A the frame 10 in a perspective view. The frame 10 has two equal, opposite side element 11 . 12 on, in the exposed state 23 arcuate. In the inserted state 24 (please refer 6B ) are the page elements 11 . 12 each clamped in the direction of larger bending radii R1. Preferably, the side elements 11 . 12 clamped so that they are present as straight bar sections.

In contrast to 5A and 5B show the 7A and 7B an indoor air filter in the exposed state 23 straight page elements 11 . 12 . 13 . 14 has and formed a frame plane E1. Hence, the frame is 10 essentially just. Furthermore, the cabin air filter 8th at least three projections 26 . 27 on, in the exposed state 23 extend perpendicular to the plane Rahmenebne E1, wherein at least two projections 26 in one direction X and at least one projection 27 extend in an opposite direction X '. The at least three protrusions 26 . 27 lie in the inserted state 24 on the filter housing 7 on and transmit the corresponding restoring forces F1, F2, F3, so that by means of power transmission to the at least three projections 26 . 27 the frame 10 is braced and bent against its substantially flat original shape. In this case, the superelevation S is generated by the tension and is only in the inserted state 24 in front. In this case, the elevation S is the distance between the outer lower edges 32 and a projection origin 34 , The projection origin 34 means the transition between, for example, frames 10 and lead 27 . 26 ,

8th each shows a top view of a top 35 ( 8th above) and a bottom 36 ( 8th below) of the cabin air filter 8th out 7A and 7B , In particular, there are four projections 26 each in a corner of the frame 10 (at the beginning and end of the page elements respectively 11 . 12 ) on the top 35 of the cabin air filter 8th arranged. On the bottom 36 ( 8th below) of the cabin air filter 8th is a lead 27 centered on the side element 11 and a lead 27 centered on the side element 12 arranged. Center is on the length of the side elements 11 and 12 based. The projections 26 . 27 are with the frame 10 , in particular by means of adhesive bonds, connected. Alternatively, the projections 26 . 27 to the frame 10 molded, in particular manufactured as a one-piece injection-molded component. The projections 26 . 27 could for example also to the frame 10 or another element of the cabin air filter 8th to be infused. Furthermore, the projections 26 . 27 also detachable with the frame 10 or another element of the cabin air filter 8th be connected. This can be realized for example by means of a Velcro connection or a Velcro fastener.

9A and 9B show in contrast to 7A and 7B projections 28 . 29 on the filter housing 7 are formed. The projections 28 . 29 bend in the inserted state 24 of the cabin air filter 8th with the help of the support surfaces 25 the frame 10 of the cabin air filter 8th contrary to its original form. In this case, the projections extend 28 in the direction X and the projections 29 in the opposite direction X ', with the projections 28 inside the filter housing 7 the projections 29 are facing, so that when inserted state 24 the projections 28 on top 35 of the cabin air filter 8th press and the tabs 29 on the bottom 36 the cabin air filter B. This has the advantage that a planar cabin air filter, which can be easily manufactured, for the filter assembly 6 can be used.

For example, a combination of projections 26 . 27 attached to the cabin air filter 8th , and protrusions 28 . 29 attached to the filter housing 7 are provided exist.

10 shows an interior air filter 8th , where the frame 10 four page elements 11 . 12 . 13 . 14 having at their ends connected to each other and in the exposed state 23 are bent within the frame plane E1. Here are the opposite side elements 11 . 12 from the fold pack 9 from each bent outwards and the opposite side elements arranged 13 . 14 each bent inwards. The bends are thus present about a bending axis Z, which runs perpendicular to the frame planes E1, or a parallel thereto. The page elements 11 . 12 have a bending radius R3 along the length of the side elements 11 . 11 may vary in amount. The page elements 13 . 14 have a bending radius R2 along the length of the side elements 13 . 14 may vary in amount. Alternatively, all page elements 11 . 12 . 13 . 14 from the fold pack 9 be bent inwards or outwards.

11 shows the filter assembly 6 , The page elements 11 . 12 . 13 . 14 are contrary to their curved original form (see 10 ) with the help of four wedge elements 30 . 31 braced. Here are the wedge elements 31 (indicated by dashed lines, since they are hidden in this perspective) within the frame 10 arranged so that the restoring force F4 from the side member 13 and the restoring force F6 from the side member 14 in the direction of the fold pack 9 each on a wedge element 31 to press. Furthermore, the wedge elements 30 outside the frame 10 arranged so that the restoring force F5 from the side member 11 and the restoring force F7 from the side member 12 towards the fold pack 9 each on a wedge element 30 to press. Thus, the frame 10 between the wedges 30 . 31 clamped. Furthermore, the wedge elements 30 . 31 rigid with the filter housing 7 connected.

12 shows a wedge element 30 . 31 out 11 , The wedge element 30 . 31 extends in the inserted state 24 of the cabin air filter 8th out of the frame plane E1. The wedge element 30 . 31 has an insertion bevel 37 on to a continuous bending of the side elements 11 . 12 . 13 . 14 by mounting the cabin air filter 8th on the wedges 30 . 31 to enable. The insertion bevel 37 merges into a region of constant wall thickness around a support surface 25 for the cabin air filter 8th to provide a stable seat ensures the same.

For example, a combination with at least one wedge element 30 . 31 on the filter housing 7 is mounted, and one or more projections on the cabin air filter 8th that extend in a direction that lies within the frame plane E1.

In the 2 - 12 shown cabin air filters 8th could by means of a method for obstructing the cabin air filter 8th in the filter housing 7 be built, the frame 10 of the cabin air filter 8th with the help of the support surfaces 25 in the filter housing 7 Bent against its original shape and against the filter housing 7 is biased and the bending and preload is permanently fixed.

Furthermore, all the above-described embodiments and embodiments of the inner space air filter apply 8th and the filter housing 7 for the filter assembly accordingly.

Although the present invention has been described in detail with reference to preferred embodiments, it is not limited thereto, but variously modifiable. In the present case, "a" does not exclude a large number.

LIST OF REFERENCE NUMBERS

1

motor vehicle

2

air conditioning

3

outside air

4

filtered air

5

cabin

6

A filter assembly

7

filter housing

8th

Cabin air filters

9

Filter medium, fold pack

10

frame

11, 12, 13, 14

page element

15

wrinkles

16

fold edges

17, 18

end folds

19, 20

folded profile

22

folding section

21

ground

23, 24

Status

25

support surfaces

26, 27, 28, 29

head Start

30, 31

key member

32

lower edge

33

footprint

34

projection origin

35

top

36

bottom

37

bevels

A1, A2

pleat spacing

E1

frame plane

E2

level

F1-F7

Restoring force

H

pleat height

L

flow direction

M

machine direction

R1, R2, R3

bending radius

S

camber

RE

clean side

RO

unfiltered side

X, X '

direction

Z, Z '

bending axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2004116804 A [0005]

Cited non-patent literature

• ISO 12103-1 [0019]
• ISO 9237 [0019]
• DIN 71460-1 [0019]
• ISO 12103-1 [0020]
• DIN 71460-1 [0020]
• ISO 9237 [0020]
• DIN 71460-1 [0020]

Claims (10)

Cabin air filter ( 8th ) for a motor vehicle ( 1 ) for insertion into a contact surface ( 25 ) for the cabin air filter ( 8th ) comprehensive filter housing ( 7 ), wherein the bearing surfaces ( 25 ) a built-in geometry for the cabin air filter ( 8th ), whereby the cabin air filter ( 8th ) a frame ( 10 ) and a filter medium ( 9 ), the frame ( 10 ) the filter medium ( 9 ) at the edge, the frame ( 10 ) in an exposed state ( 23 ) has an original shape and in an inserted state ( 24 ) and is bendable contrary to its original shape. Interior air filter according to claim 1, wherein the frame ( 10 ) at least one page element ( 11 . 12 . 13 . 14 ) which in the exposed state ( 23 ) arcuate and in the inserted state ( 24 ) in the direction of larger bending radii (R1, R2, R3) is braced. Interior air filter according to claim 2, wherein the frame ( 10 ) opposite side elements ( 11 . 12 ) which in the exposed state ( 23 ) are bent around a same bending axis (Z). Interior air filter according to claim 2, wherein the frame ( 10 ) at least four page elements ( 11 . 12 . 13 . 14 ) which in the exposed state ( 23 ) are bent within a frame plane (E1). Interior air filter according to claim 1, wherein the frame ( 10 ) in the exposed state ( 23 ) even page elements ( 11 . 12 . 13 . 14 ), which form a frame plane (E1). Interior air filter according to one of claims 1-5, further comprising at least one projection ( 26 . 27 ) extending perpendicular to a frame plane (E1). An interior air filter according to claim 5, further comprising at least three protrusions ( 26 . 27 ), which in the exposed state ( 23 ) extend perpendicular to the Rahmenebne (E1), wherein at least two projections ( 26 ) in one direction (X) and at least one projection ( 27 ) extend in an opposite direction (X ') and wherein the at least three projections (X') 26 . 27 ) in the inserted state ( 24 ) on the filter housing ( 7 ), so that by means of power transmission to the at least three projections ( 26 . 27 ) the frame ( 10 ) and bent contrary to its original shape. Filter arrangement ( 6 ) with an interior air filter ( 8th ) according to any one of claims 1-7 and a filter housing ( 7 ), which bearing surfaces ( 25 ) for the cabin air filter ( 8th ), the frame ( 10 ) and the bearing surfaces ( 25 ) are configured such that in the inserted state ( 24 ) the cabin air filter ( 8th ) is clamped so that the bearing surfaces ( 25 ) a built-in geometry for the cabin air filter ( 8th ) pretend. Filter assembly according to claim 8, wherein the filter housing ( 7 ) Projections ( 28 . 29 ), which in the inserted state ( 24 ) of the cabin air filter ( 8th ) Bearing surfaces ( 25 ) to the cabin air filter ( 8th ) and the framework ( 10 ) of the cabin air filter ( 8th ) bend contrary to its original form. Method for installing an interior air filter ( 8th ) according to any one of claims 1-7 in a filter housing ( 7 ), where a frame ( 10 ) of the cabin air filter ( 8th ) by means of bearing surfaces ( 25 ) in the filter housing ( 7 ) bent against its original shape and against the filter housing ( 7 ) and the deflection and preload is permanently set.

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