EP0517153A1 - Casing with sealed pipe fitting, especially an air cleaner casing - Google Patents

Abstract

2.1. In known rigid or swivelling connections between air cleaner casings and clean air pipes, distortions and/or sealing problems occur in the region of the seal during assembly. 2.2. The invention proposes a connection between a casing (1) and a pipe connection (2) having a concentric annular shaped part (4) and a V-shaped clip (9) which establishes a swivelling, firm, but releasable connection between the parts to be connected, an axial seal (11) with a defined contact pressure and sealing force being interposed. <IMAGE>

Description

The invention relates to a housing with a pipe connection in a sealed engagement with a first annular housing molded part or a housing opening connection integrated in the housing, in particular an air filter housing with a sealed pivotable clean air pipe connection.

Air filter housings are known from DE-GM 83 31 188 and DE-GM 86 31 228, which have a rigid connection for the clean air pipe. Due to the rigid connection (welded, glued, soldered, flanged), the clean air can only be discharged in a single predetermined direction, which is associated with disadvantages when installed in a motor vehicle and / or is associated with additional assembly effort. The rigid connection easily leads to tension.

Other constructions, for example an air filter housing according to DE-OS 37 34 338, provide a clean air connection which can be pivoted on the air filter housing, but a perfect seal in the pivoting range is not ensured during later tensioning, so that unfiltered raw air can get into the clean air pipe.

From GB-OS 20 16 627 and EP-OS 0 232 640 detachable, sealed pipe connections are known in principle. When used with a clean air tube and a filter housing, however, due to the long, unsupported tube length, high bending moments occur in particular at the connection point between the clean air tube and the filter housing, which can also lead to leaks as a result of deformation.

The object of the invention is to provide a housing with a sealed pipe connection of the type mentioned, which seals perfectly in the pipe connection area with a simple structure and which nevertheless provides a detachable pivotable connection between the connection parts.

The object on which the invention is based is achieved by the features specified in the characterizing part of claim 1.

The subject of the invention is advantageously further developed by the features of subclaims 2 to 12.

The essence of the invention is that a second concentric annular molded part of the pipe connection, which is fastened to the first molded part or to the housing opening at a radially outer location, has a conical, radially outer peripheral section which is clamped to a conical ring section of the pipe connection by means of a V-shaped clamp , wherein the pipe connection has an axial seal which is in sealing engagement against a radial section of the first molded part or of the housing opening, and the pipe connection then abuts against an axial stop of the first or second molded part, so that a defined sealing force is set up in the axial seal and thus the seal cannot be damaged.

The axial stop is preferably a (rolled-in) bead of the second molded part, which bears against an (integrated) rib of the pipe connection.

Alternatively, the axial stop can also be provided in the region of the radial section of the first molded part, against which the axial seal also bears. For this purpose, the pipe connection has an annular, integrated nose in the axial direction, which abuts the radial section.

The axial seal is expediently located in the region of a seal which is located on a filter cartridge of an air filter itself on the other side of the aforementioned radial section of the first molded part or housing opening connection piece.
It is particularly expedient if the axial seal approximately corresponds in shape, dimension and Shore hardness to the seal of the filter cartridge.

The conical ring section preferably has two opposite conical stop surfaces for the V-shaped clamp and the second conical shaped part.

Both conical abutment surfaces can be formed in a bead-like manner with the pipe connection. Alternatively, however, one of the two conical stop surfaces can be formed by a third, ring-shaped, separate molded part, which is fastened in an integrated manner to the actual pipe connection. In this embodiment variant, the other conical stop surface for the V-shaped clamp is formed by the second conical shaped part.

Another embodiment provides that the second conical shaped part has a coaxial guide section for the axial seal and / or the pipe stop.

The second and / or third molded part consist of sheet metal or plastic.

A particularly advantageous embodiment variant is characterized in that a clamp assembly aid is provided in the region of the second annular molded part, which can in particular be circumferential housing ribs. The mounting aid can also be a concentric mounting ring, which is attached to the radial wall of the housing opening.

As can be seen, the invention creates a simple, releasable and reliably sealing connection between the housing and the pipe connection, in particular in the case of an air filter housing in the region of the clean air pipe connection. The clean air pipe socket can be rotated into any installation position and clamped there, which was previously only possible by rigid constructions by rotating the entire filter system or only once during initial installation. A purely axial seal is set up, which greatly simplifies assembly (no friction when pushed onto the pipe socket) and does not damage the seal during assembly. The clamp diameter is large, which leads to small deformations in the sealing area. The contact pressure of the seal is limited by the design of the axial fixed stops in order to avoid permanent deformation. Due to the reliable axial seal, which can practically not be damaged, there is a long service life.

An axial seal of a pipe connection in an air filter housing is known from US Pat. No. 2,507,897. However, there is no axial stop, which prevents a defined sealing force from being established in the assembled state of the device.

Furthermore, a clamp fastening of two cylindrical molded parts is known from US Pat. No. 2,273,210. The two molded parts, however, do not have any conical peripheral sections in the area of the clamp fastening, but rather flange-like edges, with no seal being interposed. As a result, there is no reliable seal.

Fig. 1

eine Luftfiltergehäuse-Reinluftrohr-Verbindung im Schnitt,

Fig. 2

eine zweite Ausführungsvariante im Schnitt entsprechend Fig. 1, und

Fig. 3

eine dritte Ausführungsvariante im Schnitt entsprechend den Fig. 1 und 2.

The invention is described below with reference to exemplary embodiments with reference to the accompanying drawings; show it:

Fig. 1

an air filter housing-clean air pipe connection on average,

Fig. 2

a second embodiment variant in section corresponding to FIG. 1, and

Fig. 3

a third embodiment variant in section corresponding to FIGS. 1 and 2.

According to FIG. 1, a housing opening connection piece (21) integrated with an air filter housing comprises an axial connection piece section in order to form the housing passage opening (5). A clean air pipe connection (2) is attached to the axial nozzle area, which e.g. is designed as an extrusion with an integrated conical ring section (10).

A second annular molded part (4) is fastened to the radial section of the housing opening connector (21), which in turn has a conical radial section (8) at the non-fastened end. The conical radial section (8) serves as a contact surface for the integrated conical ring section (10) with the same orientation of the associated contact surface. Ring section (10) and radial section (8) are firmly clamped by means of a V-shaped clamp (9). An assembly aid in the form of a concentric assembly ring (22) is provided to facilitate assembly of the V-shaped clamp (9) and is attached to the radially outer location of the housing opening connector (21). The opening of the mounting ring (22) is dimensioned so that the V-shaped clamp (9) can be accommodated concentrically before it is braced on the conical ring surfaces.

The second annular molded part (4) has a coaxial guide section for the ring-shaped end of the pipe connection (2) at the radially innermost point, wherein between the axial and radial nozzle sections of the housing opening section (21), the foremost end of the pipe connection (2) and the aforementioned coaxial guide section (17) a receiving space is formed, in which an axial seal (11) is located, which is in sealing engagement with the radial wall of the housing opening connector (21).

The embodiment according to FIG. 2 basically corresponds to that according to FIG. 1. An air filter housing (1) is not provided with an integrated housing opening connection piece (21), but with a separate first annular molded part (3). which is firmly and sealingly attached to the housing wall (6) of the actual housing and has at the non-attached end a coaxial concentric guide socket (7) which is provided for pre-centering the clean air pipe connection (2).

The first molded part (3) also has a radial section (12) on which the axial seal (11) of the pipe connection lies in a sealing manner. The axial seal (11) is received in an annular groove at the end of the clean air pipe connection (2), which is a molded part made of aluminum or plastic, for example. The pipe connection (2) has an integrated axial nose (20) which bears in a form-fitting manner against the radial section of the first annular molded part (3) in order to limit the sealing force of the axial seal (11) when the device is clamped.

The axial seal (11) is provided in shape, dimension and Shore hardness in approximately a seal (15) which is applied on the other side of the radial section (12) on the filter cartridge (16) itself in order to achieve a similarly good seal , as is already the case between the filter cartridge (16) and the radial section (12).

The second annular molded part (4) is attached to the radial section (12) at the radially outer location with respect to the axial seal (11), in particular welded, soldered or the like. At the other end it has a conical radial section (8) which interacts with a conical ring section of a third annular shaped part (18), in particular is firmly and releasably clamped in a releasable manner by means of a V-shaped annular clamp (9). The ring-shaped molded part (18) has an integrated coaxial base, which is positively and firmly received in an annular recess in the clean air pipe socket (2).

The diameter of the V-shaped clamp (9) is comparatively large. By selecting the large clamp diameter, large bending moments caused by vibrations of the clean air pipe connection (2) are converted into pairs of forces with relatively low individual forces, which leads to low deformations of the sealed parts.

The assembly of the V-shaped clamp (9) is facilitated in that the clamp (9) can be supported on the outer radial wall of the second annular molded part (4) before installation.

The embodiment illustrated in FIG. 3, like the embodiment according to FIG. 2, provides a pipe connection (2) in the form of a molded part such as aluminum, the conical ring section (10) being formed by a single conical radial surface integrated with the pipe connection (2) , which is braced against the conical radial surface of the second annular molded part (4) by means of the V-shaped clamp (9). The V-shaped clamp (9) is made easier by small ribs (19) in that the clamp is held almost at the installation height during installation. The ribs are molded onto the air filter housing (1).

The second annular molded part (4) according to FIG. 3 is firmly connected to the first annular molded part (3) at the radially inner point and has a rolled-in bead (13) in the area of the fastening point, which ribs against circumferential ribs when the pipe connection (2) is tensioned (14) of the pipe connection (2) abuts. The peripheral ribs (14) are integrally formed with the pipe connection (2).

1 to 3 are made so that the clamping force caused by the V-shaped clamp (9) does not damage the axial seal (11) can, especially by setting up fixed axial stops for the pipe connection (2).

All conical surfaces in the bracing area of the V-clamp (9) are matched to each other in terms of their incline. The thickness of the conical ring section (10) and the thickness of the conical edge sections (8) of the second and third molded parts are matched to one another, so that a defined clamping force of the arrangement as a whole and a defined sealing force in the area of the axial seal (11) are established .

As can be seen, the pipe connection (2) can be pivoted or rotated into any installation position without causing additional tension at the connection point between the housing (1) and the pipe connection (2).

All new features mentioned in the description and / or shown in the drawing, alone or in a meaningful combination, are essential to the invention, even if they are not expressly claimed in the claims.

Claims (12)

Housing with a pipe connection in a sealed engagement with a first annular housing molded part (3) or a housing opening connection piece (21) integrated in the housing, in particular air filter housing (1) with a sealed clean air pipe connection (2),
characterized,
that a second concentric, ring-shaped pipe connection molded part (4) fastened to the first molded part (3) or to the housing opening connection piece (21) at a radially outer location has a conical radially outer peripheral section (8) which is connected by means of a V-shaped clamp (9) is braced with a conical ring section (10) of the pipe connection (2), the pipe connection (2) having an axial seal (11) which seals against a radial section (12) of the first molded part (3) or the housing opening connection piece (21) stands and strikes against an axial stop of the first or second molded part (3 or 4). Housing according to claim 1,
characterized,
that the radial stop is a bead (13) of the second molded part (4) which bears against a rib (14) of the pipe connection (2) (Fig. 3). Housing according to claim 1,
characterized,
that the axial stop is a region of the radial section (12) of the first molded part, on which radial section the axial seal (11) also bears (FIG. 2). Housing according to one of claims 1 to 3,
characterized,
that the axial seal (11) is located in the area of the seal (15) which lies on a filter cartridge (16) of an air filter on the other side of the radial section (12) of the first molded part (3) or the housing opening connection piece (21) (Fig .2). Housing according to claim 4,
characterized,
that the axial seal (11) in shape, dimension and shore hardness of the seal (15) of the filter cartridge (16) corresponds approximately (Fig. 2). Housing according to one of claims 1 to 5,
characterized,
that the conical ring section (10) has two opposite conical stop surfaces for the V-shaped clamp (9) and the second conical shaped part (4) (Fig. 1). Housing according to one of claims 1 to 5,
characterized,
that the conical ring section (10) has a third annular separate molded part (18) which is fastened to the actual pipe connection (2) in an integrated manner (Fig. 2). Housing according to one of claims 1 to 7,
characterized,
that the second conical shaped part (4) has a coaxial guide section (17) for the axial seal (11) and / or the pipe connection (2) (Fig. 1). Housing according to one of the preceding claims,
characterized,
that the second and / or third molded part (4 or 18) consist of sheet metal or plastic (Fig. 1 and 2). Housing according to one of the preceding claims,
characterized,
that a clamp assembly aid is provided in the area of the second annular molded part (4) (FIG. 2). Housing according to claim 10,
characterized,
that the assembly aid housing circumferential ribs (19) (Fig. 3). Housing according to claim 10,
characterized,
that the mounting aid is a concentric mounting ring (22) (Fig. 1).

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