WO2018050237A1

WO2018050237A1 - Filter device, in particular air filter, for an air supply system of an internal combustion engine

Info

Publication number: WO2018050237A1
Application number: PCT/EP2016/071885
Authority: WO
Inventors: Alexandre LUCHESI DE ALMEIDA; Edson VALDOMIRO DE AZEVEDO JUNIOR; Pedro BASSO; Marcos José DANTAS DE OLIVEIRA
Original assignee: Mahle International Gmbh; Mahle Metal Leve S/A
Priority date: 2016-09-15
Filing date: 2016-09-15
Publication date: 2018-03-22

Abstract

The invention relates to a filter device (1), in particular an air filter, for an air supply system of an internal combustion engine. The filter device (1) comprises a filter housing (2) defining a housing inner space (3), and a filter element (5) that can be inserted into the housing inner space (3) and detachably fixed to the filter housing (2). When inserted into the housing inner space (3), the filter element (5) divides said space into an unfiltered side and a clean side. The filter device (1) also comprises an inner frame (6) that can be inserted into the housing inner space (3), for carrying the filter element (5). A locking device (15) is embodied on the filter housing (2) in such a way that it allows the filter element (5) to be fixed to the filter housing (2) when the inner frame (6) is inserted into the housing inner space (3). When the inner frame (6) is not inserted into the housing inner space (3), the locking device (15) blocks the fixing of the filter element (5) to the filter housing (2).

Description

Filter device, in particular air filter, for a fresh air system of an internal combustion engine

The invention relates to a filter device, in particular an air filter, for a fresh air system of an internal combustion engine, as well as an internal combustion engine with such a filter device.

Modern air filters for fresh air systems of internal combustion engines typically have a filter housing in which an inner frame is mounted. The inner frame serves to receive the replaceable filter element to which the filter material for filtering the air flowing through the filter device is attached. In the course of assembling the filter device, the inner frame is typically first releasably secured to the filter housing, for example by means of a screw, clip or latching connection. Subsequently, the filter element is introduced into the filter housing, slid onto the inner frame and additionally - as well as the inner frame - fixed in the filter housing or on the inner frame or a nozzle. The inner frame supports the filter element in the direction of flow. Thus, differential pressures in the filtration operation can not deform the filter element so much that it will damage the filter medium.

If the filter element is introduced into a filter housing in which no inner frame has previously been attached, there is a risk of considerable damage or even destruction of the filter element, including the filter material provided on the filter element. It is therefore an object of the present invention to provide an improved embodiment of a filter device in which the risk of damage or even destruction of the filter element is at least reduced by large differential pressures in the filter housing.

This object is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject of dependent patent claims.

The basic idea of the invention is therefore to provide a filter device with a locking device which prevents insertion of the replaceable filter element into the housing interior when the inner frame is not inserted into the housing interior. Conversely, such a locking device allows insertion of the filter element in the housing interior and fixing the filter element on the filter housing with inserted into the housing interior inner frame.

In this way it is ensured that an assembly of the filter element in the filter housing is only possible if the inner frame is present. Then, the filter element as described above can be pushed in the usual way on the inner frame and then fixed to the filter housing, for example by a bayonet connection or a thread. To form the bayonet connection, the filter element has corresponding geometries which interact with counter-geometries on the filter housing. If, on the other hand, the inner frame is missing as a supporting part or as a guide for the filter element, a fixation of the filter element on the filter housing is precluded. In this way, a mounting of the filter element with not available in the housing interior and for receiving the filter element available inner frame excluded be sen. Thus, a proper assembly of the filter device is always ensured as a result.

A filter device according to the invention, in particular an air filter, for a fresh air system of an internal combustion engine comprises a filter housing which delimits a housing interior. In the housing interior, an exchangeable filter element can be used. The filter element can be releasably attached to the filter housing. In a state inserted into the housing interior, the filter element divides this into a raw side and a clean side. The filter device also includes an insertable into the housing interior inner frame for attaching the filter element. According to the invention, a locking device is attached to the filter housing. The locking device essential to the invention is designed such that, when the inner frame is inserted into the interior of the housing, it allows fastening of the filter element to the filter housing. By contrast, in the case of an inner frame which is not inserted into the housing interior, the locking device blocks attachment of the filter element to the filter housing.

According to a preferred embodiment, the blocking device comprises a locking lever arranged on the filter housing. This locking lever is adjustable between a blocking position in which it blocks the fastening of the filter element to the filter housing, and a release position in which it allows the attachment of the filter element to the filter housing. Such, adjustable between two positions locking lever is technically particularly easy to implement, so that the invention essential functional principle of the locking device can be implemented technically particularly simple and therefore cost.

Appropriately, the locking lever is designed such that it is adjusted in not inserted into the housing interior inner frame in the locked position. At in the housing interior inserted inner frame of the locking lever is moved to the release position.

In an advantageous development, the filter element for fastening to the filter housing by means of a rotary movement with the filter housing is releasably latched. In the locked position, the locking lever blocks the latching of the filter element with the filter housing. In this way, an attachment of the filter element to the filter housing and thus any associated damage to the filter element is avoided when the inner frame is not mounted on the filter housing and disposed in the housing interior.

In an advantageous development of the locking lever projects in the locking position into the housing interior, so that blocks a rotational movement of the filter element for locking with the filter housing. This variant is technically particularly easy to implement and therefore inexpensive.

As a particularly simple to implement and thus cost proves another preferred embodiment in which the locking device, in particular the locking lever, is arranged in a housing pot of the filter housing. In this embodiment, the locking lever is pressed by the inner frame inserted into the housing interior downwards, preferably towards the housing pot.

Preferably, the locking lever is at least partially formed as a hook, or it includes such a hook, which protrudes into the housing interior, at least in the locked position. In this variant, the locking device in the housing interior requires little space. Particularly simple to manufacture and therefore particularly inexpensive is another preferred embodiment in which the locking lever is integrally formed on the filter housing, in particular on the housing pot of the filter housing.

In a further preferred embodiment, the locking lever is biased towards the blocking position. In this way, it is ensured that the locking lever is automatically in the locked position when not inserted into the interior of the housing interior frame.

In a further preferred embodiment, a stopper is formed on the filter element, which abuts by means of a rotary movement for locking the filter element with the filter housing on the blocked position in the blocking position locking lever, so that the stopper applied to the blocking lever blocks a continuation of the rotational movement of the filter element.

Particularly expediently, the filter element is designed as a ring filter with an end disk, from which the stopper designed as a projection protrudes axially. This embodiment is structurally particularly easy to implement by the projection in the course of a plastic injection molding process is integrally formed on the end plate. Alternatively, the stopper can also be retrofitted, in particular glued, screwed or riveted. In this case, different materials such as sheet metal can be selected for the end plate.

According to an advantageous development, the inner frame, preferably an inner frame end plate of the inner frame, a cooperating with the locking device projection. Said projection presses the locking lever with inserted into the housing interior inner frame in the release position. This embodiment is structurally particularly easy to implement, if the Projection in the course of a plastic injection molding integrally formed on the Innenzarge- end plate.

The invention further relates to internal combustion engine with a fresh air system for introducing fresh air into the combustion chambers of the internal combustion engine. The internal combustion engine further comprises an existing in the fresh air system, previously presented filter device. The above-explained advantages of the filter device are therefore also transferred to the internal combustion engine according to the invention.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be explained in more detail in the following description.

It show, each schematically:

1 a shows a filter housing of a filter device according to the invention,

1 b is a detailed view of Figure 1 a in the region of the locking device, 2a in the region of an axial end disk of the ring filter, an inner frame of the filter device according to the invention, a detail of Figure 3a in the region of Innenzarge- end plate of the inner frame, the filter device according to the invention in the region of Housing pot without inserted into the housing interior inner frame, so that the locking lever is in the blocking position, the filter device according to the invention in the region of the housing pot with inserted into the housing interior inner frame, so that the locking lever is in the release position an outside view of the filter device.

Figures 1 a, 2a and 3a show the essential components of a filter device 1 according to the invention, which can be designed as an air filter for a fresh air system of an internal combustion engine.

First, however, attention is directed to the representation of Figure 6, which shows the filter device 1 in a perspective outside view. According to Figure 1, the filter device 1 comprises a filter housing 2, a Housing pot 4, a housing cover 21, a Rohlufteinlass 22 and a clean air outlet 23 has. The housing 2 can be opened by removing the housing cover 21. The housing pot 4 has axially opposite the housing cover 21, a pot bottom 24. The clean air outlet 23 is located on this pot bottom 24 and is facing away from the viewer in Figure 6 and therefore not visible. The filter housing 2 can also be equipped with a console 25 and with a discharge nozzle 26 to which a discharge valve 27 is arranged in the example shown. The filter housing 2 has a longitudinal central axis which is defined by a cylindrical pot wall 28 of the housing pot 4. The longitudinal center axis M in turn defines an axial direction A of the filter device 1. The axial direction A extends parallel to the longitudinal central axis M. A radial direction of the filter device 1 extends transversely to the axial direction A. A circumferential direction U of the filter device 1 rotates about the longitudinal central axis M.

FIG. 1a shows, in a separate illustration, a filter housing 2 of the filter device 1. The filter housing 2 of the filter device 1 defines a housing interior 3. The filter housing 2 may be designed in several parts. For the sake of clarity, FIG. 1a shows only one housing pot 4 of the filter housing 2. In this case, angle elements 20 are arranged on the housing pot, to which components of the filter device 1 can be attached.

FIG. 2 a shows a separate illustration of a filter element 5 of the filter device 1. The filter element 5 can be inserted interchangeably into the housing interior 3 and fastened there detachably to the filter housing. Said detachable connection takes place approximately by means of a latching connection (not shown) or a segment collar 29. The filter element 5 divided in a state inserted into the housing interior 3 this in a raw side and a clean side (not shown). For this purpose, the filter element 5 on a filter material 12, which is preferably designed as a pleated annular closed filter medium. At the end, the filter element has axial end disks 19, which are sealingly connected to the filter material. Preferably, one of the axial end plates 19 is designed as a closed and the opposite end plate as an open end plate. In this case, the open end disk corresponds to the clean air outlet 23.

3a shows a separate representation of an inner frame 6 of the filter device 1. In an inserted into the housing interior 3 state of the filter element 5 this is pushed over the inner frame 6. The inner frame 6 may as shown in Figure 3a have the geometric shape of a wooden cylinder, the axial End is bounded by an annular Innenzarge end plate 7. The inner frame 6 can be releasably secured to the angle element 20 of the housing pot 4 of the filter housing 2 by means of a locking or clip connection 31 formed on the inner frame end disk 7. Furthermore, the Innenzarge- end plate 7 has a connection geometry 30, by means of which the segment collar 29 fixes the filter element 5 on the inner frame 6. The filter element 5 is preferably designed as a ring filter 9, which also has the geometry of a hollow cylinder 8.

The filter element 5 may have a hollow cylindrical support 10, on the peripheral wall 11 of which a filter material 12 for cleaning the air flowing through the filter device 1 is arranged. On the carrier 10 but can also be dispensed with. In both cases, the filter material 12 can be supported radially on the inner frame 6 during operation of the filter device 1, when the air pressure of the air introduced into the raw side presses the filter material 12 radially inward.

If the filter element 5 is to be mounted in the interior of the housing 3, then it is pressed onto the internal frame 6 already arranged in the housing interior 3 in the axial direction. A of the inner frame 6 and the filter housing 2 pushed. Subsequently, the filter element 5 can be locked by means of a rotational movement in the circumferential direction of the filter housing 2 for attachment to the filter housing 2 with this.

On the filter housing 2 also has a locking device 15 is present. The locking device 15 is designed such that, when the inner frame is inserted into the housing interior 3, it allows fastening of the filter element 5 to the filter housing 2. In contrast, when not inserted into the housing interior 3 inner frame 6, the locking device 15 blocks the fastening of the filter element 5 on the filter housing 2. In this way, damage or even destruction of the filter element 5, in particular the filter material 12, prevented in the housing interior 3 existing inner frame 6 become.

1 a in the region designated by "X" in FIG. 1 a, as clearly illustrated in FIG. 1 b, the blocking device 15 comprises a blocking lever 16 formed on the filter housing 2, which is located in the housing pot 4 of the filter housing 2 The locking lever 16 is adjustable between a locking position in which it blocks the fastening of the filter element 5 to the filter housing and a release position in which it permits such fastening 2. In the blocking position, the blocking lever 16 protrudes into the housing interior 3 so that it prevents a rotational movement of the filter element 5 for latching with the filter housing 2. For this purpose, the blocking lever 16 is configured such that it does not engage inside the housing 6 is in the locked position is inserted in the housing interior 3 inner frame 6 the locking lever 16 of the inner frame 6, however, adjusted to the release position. The locking lever 16 thus blocks in its blocking position latching of the filter element 5 with the filter housing. 2 This operative connection between locking lever 16 and inner frame 6 is achieved by a stopper 13 is provided on the filter element 5. In the example scenario, such a stopper 13 is formed as protruding from the end plate 19 of the ring filter 9 along the axial direction A protrusion 14. This is shown in the illustration of FIG. 2b. 2a is a detail in the region designated by "X" in FIG. 2a. If the blocking lever 16 is in the blocking position, the stopper 13 or projection 14 strikes the filter element 5 in the course of the rotational movement A further rotational movement of the filter element 5 is therefore blocked by the locking lever 16, so that the rotational movement can not continue., A locking of the filter element 5 with the filter housing 2 is prevented in this way ,

If, however, the inner frame 6 inserted into the housing interior 3, the locking lever 16 of the locking device 15 is pushed away from the inner frame 6 down. For this purpose, the inner frame 6 axially delimiting Innenzarge- end plate 7 on a cooperating with the locking device 15 projection 18. This illustrates the illustration of FIG. 3b. Figure 3a is a detail of Figure 3a in the area indicated by "X" in Figure 3. The projection 18 pushes the locking lever 16 into its release position with the inner frame 6 inserted into the housing interior 3. In the release position, the locking lever locks 16, the rotational movement of the filter element 5 is not, so that it can be rotated relative to the filter housing 2 in the circumferential direction of the filter housing 2 until it is locked to the filter housing 2.

Particularly useful, the locking lever 16 is biased in the blocking position. In this way it is ensured that the locking lever 16 is always in the locked position without operative connection with the inner frame 6. As Figure 1 b can recognize, the locking lever 16 comprises a hook 17, which projects into the housing interior 3 in the locked position.

To illustrate the operation of the locking device 15, Figures 4 and 5, the filter device 1 in an assembled state respectively in the region of the housing pot 4. Figure 4 shows the filter device without inserted into the housing interior 3 inner frame 6, the figure 5 with in the housing interior. 3 inserted inner frame 6.

The representation of Figure 5 can be seen that the protruding from the Innenzarge- end plate 7 of the inner frame 6 projection 18 pushes the locking lever 16 down to the housing pot 4 out, so that it does not match the 9 at the end of the ring filter 9 and the filter element 5 existing stopper 13 cooperate and can block a rotational movement of the filter element 5. In contrast, the locking lever 16 protrudes into the housing interior 3 when the inner frame 6 is not inserted into the housing interior 3. In this case, the hook 17 formed on the locking lever 16 cooperates in the manner of a stopper with the projection 14 formed on the filter element 5, so that a rotational movement of the filter element 5 in a rotational position in which it can be locked to the filter housing 2 is blocked ,

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Claims

claims

1 . Filter device (1), in particular air filter, for a fresh air system of an internal combustion engine,

with a housing housing (3) limiting filter housing (2),

- With an exchangeable in the housing interior (3) arranged filter element (5), which in a housing interior in the (3) arranged state this divided into a raw side and a clean side,

with a housing frame (3) attachable inner frame (6),

- Formed with a on the filter housing (2) locking device (15), such that it allows for in the housing interior (3) inserted inner frame (6) fixing the filter element (5) on the filter housing (2) and not in the housing interior (3) inserted inner frame (6) blocked.

2. Filter device according to claim 1,

characterized in that

the locking device (15) as on the filter housing (2) arranged locking lever (16) is formed, which between a blocking position in which it blocks the fastening of the filter element (5) on the filter housing (2), and a release position in which he the fastening of the filter element (5) on the filter housing (2) allowed, is adjustable.

3. Filter device according to claim 2,

characterized in that the locking lever (16) is designed in such a way that it is displaced into the locking position when the inner frame (6) is not inserted into the housing interior and is displaced from the latter into the release position when the inner frame (6) is inserted into the housing interior (3) ,

4. Filter device according to claim 2 or 3,

characterized in that

- The filter element (5) for fixing to the filter housing (2) by means of a rotational movement with the filter housing (2) is releasably latched,

- Locking lever (16) in the locked position locking of the filter element (5) with the filter housing (2) blocked.

5. Filter device according to one of claims 2 to 4,

characterized in that

the locking lever (16) protrudes into the housing interior (3) in the locking position, so that it blocks a rotational movement of the filter element (5) for latching with the filter housing (2).

6. Filter device according to one of the preceding claims,

characterized in that

the locking device (15), in particular the locking lever (16), in a housing pot (4) of the filter housing (2) is arranged and of the in the housing interior (3) inserted inner frame (6), preferably downwardly pushed away.

7. Filter device according to one of claims 2 to 6,

characterized in that

the locking lever (16) is at least partially formed as a hook (17) or comprises a hook (17), which at least in the locked position in the Housing interior (3) protrudes or which in the locking position further into the housing interior (3) protrudes than in the release position.

8. Filter device according to one of claims 2 to 7,

characterized in that

the locking lever (16) is formed integrally on the filter housing (2), in particular on the housing pot (4).

9. Filter device according to one of claims 2 to 8,

characterized in that

the locking lever (16) is biased in the blocking position.

10. Filter device according to one of claims 2 to 9,

characterized in that

on the filter element (5) a stopper (13) is formed, which abuts by means of a rotary movement for locking the filter element (5) with the filter housing (2) on the blocked in the blocking position locking lever (16), so that at the stopper (13) adjacent locking lever (16) blocks a continuation of the rotational movement of the filter element (5).

1 1 .Filtereinrichtung according to claim 10,

characterized in that

the filter element (5) is designed as a ring filter (9) with an end disk (19) from which the stopper (13) designed as a projection (14) projects axially.

12. Filter device according to one of the preceding claims,

characterized in that

the inner frame (6), preferably an inner frame end plate (7) of the inner frame (6), a cooperating with the locking device (15) Vorvor jump (18), softer pushes the locking lever (16) in the housing interior (3) inserted inner frame (6) in the release position.

13.Brennkraftmaschine,

with a fresh air system for introducing fresh air into the combustion chambers of the internal combustion engine,

- With a present in the fresh air filtration device (1) according to one of the preceding claims.

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