DE102016007067A1 - Fluid line connection system and fluid line - Google Patents

Abstract

The invention relates to a fluid line connection system (10), in particular for the motor vehicle sector, comprising a fluid line (12) having at one end a connecting piece (18), and a housing (14), in particular filter housing, with a housing wall (22) which at least partially made of plastic and having a through hole (24) for the connection of the fluid line (12), wherein the passage recess (24) on the inner circumference side at least in sections by an annular closed Armierungshülse (26) is limited, which is embedded in the plastic material of the housing (14) and wherein the connecting piece (18) is provided with a self-tapping external thread (38) in order to screw this into the through-passage (24) while plastically forming a counter-thread (40) in the reinforcing sleeve (26). The invention further relates to a fluid line (12) for a fluid line connection system (10). The invention provides a fluid line connection system that is inexpensive and easy to manufacture and that ensures high mechanical stability of the connection

Description

Technical area

The invention relates to a fluid line connection system, in particular for the motor vehicle sector, comprising a fluid line which has a connection piece at one end, and a housing, in particular a filter housing, with a housing wall which at least partially consists of plastic and which has a through-hole for the connection of the fluid line. The invention further relates to a fluid line for a fluid line connection system.

State of the art

In the field of automotive technology hoses are often used as fluid lines, which are connected to a housing, such as an oil or fuel filter. The housing is typically made of plastic. To connect the fluid line is often introduced by unscrewing an internal thread in a recess of the housing. In this internal thread then provided with a corresponding external thread connection piece of the fluid line is screwed. The disadvantage of this is first of considerable manufacturing effort in the machining of the housing for producing the internal thread. Furthermore, due to the machining of the internal thread there is the risk that chips remain in the housing and enter the fluid system. Furthermore, the strength of this screw connection is often inadequate, especially when steel connecting pieces are used. A trained as a hose fluid line and their connection to the housing are subject during driving regularly a considerable tensile load, in particular by vibrations. As a result, the connection can be overloaded in such a way that the tightness of the connection is impaired. As a remedy Zugentlastungen can be used, but they are complicated and expensive.

The EP 2 177 725 B1 describes a filter device for an internal combustion engine of a motor vehicle, in which first a filter housing is bolted to a stiffened Anbindungsflansch. For this purpose, self-tapping or self-tapping screws can be used, which are screwed directly into the material of the filter housing. The unit of filter housing and connecting flange is then bolted to the internal combustion engine, wherein the connection flange between the filter housing and the internal combustion engine is arranged. Connecting bolts protrude through the connecting flange and are supported on this. This results in a considerable effort for production and assembly.

From the DE 20 2008 003 341 U1 is a line nipple of a fuel-carrying system has become known, which has a fastening portion with a self-tapping thread and a clear distance in front of the mounting portion has a sealing element. The line nipple can be connected to a fuel filter by a plastic housing of the fuel filter is inserted into a metallic holding part, which surrounds the plastic housing multi-sided, and the line nipple is screwed with the mounting portion in the holding part, so that the sealing element is disposed in the plastic housing. This results in an overall complex (especially expensive and heavy) construction.

From the DE 10 2010 036 596 A1 and the EP 1 939 467 A2 It has become known to inject a sleeve-shaped metal part in a plastic component, so that a screw can be passed through the metal part to attach the plastic component to another component. By the metal part, excessive compression of the plastic component when tightening the screw can be avoided.

It is an object of the invention to provide a fluid line connection system that is inexpensive and easy to manufacture and that ensures a high mechanical stability of the connection. Furthermore, it is an object of the invention to provide a fluid conduit for such a fluid line connection system.

The problem relating to the fluid line connection system is achieved by a fluid line connection system according to claim 1. The object with respect to the fluid line is achieved by a fluid line according to claim 12. Preferred embodiments are given in the dependent claims and the description.

Disclosure of the invention

According to the invention, a fluid line connection system, in particular for the motor vehicle sector, is provided, which comprises a fluid line and a housing. The fluid line has at one end a connecting piece. The fluid line may be, for example, a hose or a pipe. The connecting piece is used to connect the fluid line to the housing. The connecting piece can be connected in a manner known per se to the fluid line.

The housing may in particular be a filter housing, such as a fuel filter or an oil filter. Furthermore, the housing can form a pressure-resistant container, such as this as a compressed air tank for a brake system or a Suspension system is used. The housing comprises a housing wall, which consists at least partially of plastic and which has a through-hole for the connection of the fluid line. An at least partially made of plastic housing wall can be easily and inexpensively in large quantities, for example by injection molding, manufactured. Even complex geometries are comparatively easy to implement. About the passage recess, the fluid line can be connected. Thus, fluid can flow from the fluid conduit into the housing or vice versa.

The through-passage of the housing is bounded on the inner peripheral side, at least in sections, by an annularly closed reinforcing sleeve. The armor sleeve is embedded in the plastic material of the housing. The housing with the reinforcing sleeve thus forms a hybrid housing with a reinforcing part embedded in a plastic matrix. The reinforcing sleeve reinforces the housing in the region of the through-hole. The armor sleeve may be made of a material having a higher strength and / or higher rigidity than the plastic of the housing. Preferably, the reinforcing sleeve is not surrounded on its inner circumference by the plastic of the housing. Preferably, the Armierungshülse is injected in the manufacture of the housing in the plastic. Alternatively, the reinforcing sleeve can also be subsequently used with local melting or plasticizing of the plastic in the housing. The housing may in particular be a plastic injection-molded part with an endoskeleton made of a material with a material resistance greater than that of the housing of the housing, for example metal.

The connection piece is provided with a self-tapping external thread. It can thus be screwed under plastic molding of a counter-thread in the Armierungshülse in the through hole. The cost of mounting the connection piece to the housing is thereby, compared to the assembly in a prefabricated internal thread, not increased or at most insignificant. However, it can be dispensed with to provide an internal thread in the through-hole as the mating thread, such as by threading or spindling. This simplifies the production considerably. When screwing the self-tapping external thread of the connecting piece into the reinforcing sleeve, no chips are formed. It is therefore not necessary to provide a closed chip space or to free the fluid system after screwing the connection piece of chips.

When screwing the connecting piece in the Armierungshülse the Armierungshülse is locally plastically deformed by the self-tapping outer thread, so that the mating thread is formed. Thereby, a fluid line connection with increased mechanical stability can be obtained. In particular, the connection of the connecting piece with the Armierungshülse record higher tensile forces than is the case with a direct screw in the plastic material of the housing. Leaks due to the mechanical stress of the connection can thus be reliably avoided in the fluid line connection system according to the invention. Advantageously, the self-tapping external thread is designed so that the connecting piece is secured against loss by friction in the mating thread of the reinforcing sleeve.

In an advantageous embodiment, it is provided that the reinforcing sleeve at least partially has a ribbing on the housing wall side. By ribbing the connection of the reinforcing sleeve can be improved to the plastic of the housing. The armor sleeve is thus safer, d. H. stronger, anchored in the housing wall. The ribbing may have in the circumferential direction of the Armierungshülse radially outer circumferential ribs and grooves. Alternatively or additionally, the ribbing in the longitudinal direction webs or depressions. By circumferentially extending ribbing a positive anchoring of the reinforcing sleeve is achieved in the plastic material, whereby the transmittable axial forces can be increased.

It is preferably provided that the fluid line connection system has a sealing element for sealing the connecting piece against the housing. By the sealing element, a fluid-tight connection of the connecting piece to the housing can be achieved. Advantageously, the sealing of the connecting piece against the housing wall made of plastic. The seal is thus decoupled from mechanical loads of the screw connection of the connecting piece in the Armierungshülse.

In an advantageous development of the connecting piece has a seal receiving, in which the sealing element is held held. This simplifies the installation of the sealing element or connecting piece. The seal receptacle can be designed as a peripheral groove (= annular groove) on an extension of the connecting piece facing the housing interior.

The sealing element according to the invention may be a radial sealing element or an axial sealing element. In the simplest case, the sealing element may be an O-ring or a so-called quadring or a flat gasket.

In a particularly preferred embodiment it is provided that the housing has a sealing portion with a sealing surface for abutment of the sealing element, which is formed concentrically to the passage recess. A concentric with the through-hole sealing surface can be particularly easily sealed with a radial seal. For this purpose, the sealing element can be arranged on a sealing receptacle of the connecting piece, so that it is likewise aligned concentrically with the through-hole when the connecting piece is screwed into the reinforcing sleeve. The sealing surface is preferably formed on an inner side of the through-hole and arranged closer to a housing interior viewed from the Armierungshülse. The sealing portion of the connecting piece is then arranged at an end of the connection piece remote from the fluid line, beyond the self-tapping external thread. It can thereby be avoided that the fluid comes into contact with the armor sleeve or the embedding area of the armor sleeve.

In a further preferred embodiment, the sealing receptacle of the connecting piece may be present between the self-tapping external thread and a free end of the connecting piece, wherein the sealing receptacle may be arranged in the sealing portion of the housing in a mounting state of the fluid line connecting system. As a result, a clear separation of the sections of the connecting piece for mechanical fastening and sealing is achieved. The connecting piece with the seal receptacle in the vicinity of its free end extends at least so deeply into the through-passage of the housing that a seal takes place in the sealing section lying beyond the reinforcing sleeve.

Preferably, a diameter of the sealing portion of the housing is smaller than a (lighter) inner diameter of the Armierungshülse. The sealing member may then be advanced to the sealing portion into the through-hole, without contacting the arming sleeve. Preferably, the diameter of the sealing portion is at least 6%, more preferably at least 12%, smaller than the inner diameter of the Armierungshülse. Preferably, the diameter of the sealing portion is at most 24%, more preferably at most 18%, smaller than the inner diameter of the reinforcing sleeve.

Particularly preferably, the housing between the Armierungshülse and the sealing portion on an insertion bevel for the connection piece. As a result, damage to the sealing element during insertion into the sealing portion can be avoided. In particular, it can be ensured that the sealing element is not sheared off at one edge, but slides off at the insertion bevel.

In an advantageous embodiment, the connection piece has a shoulder for axial support on the reinforcement sleeve. A bias of the screw in the axial direction is then introduced directly into the Armierungshülse and not into the plastic of the housing wall. Also occurring during operation of the fluid line connection system forces, such as by train on the fluid line or vibrations of the fluid line are introduced directly into the Armierungshülse. This further improves the load capacity of the fluid line connection system. The outer diameter of the shoulder should be chosen so that it is larger than the inner diameter of the Armierungshülse. The axial sequence on the connecting piece viewed from the free end of the connection piece is thus as follows: seal receiver, self-tapping external thread, shoulder.

Preferably, the connection piece is made of steel. Steel has sufficient hardness and strength to form the mating thread when screwing in the self-tapping external thread. Furthermore, steel is available in alloys that are resistant to most fluids.

An advantageous embodiment is characterized in that the Armierungshülse consists of metal. With a reinforcing sleeve made of metal, the desired reinforcing effect can be achieved at the through-hole. Preferably, the metal is aluminum or a non-ferrous metal. Aluminum and non-ferrous metals are typically softer than steel. A steel connecting piece can then be screwed into the reinforcing sleeve, forming the counter thread. The reinforcing sleeve can be advantageously manufactured in a die-casting process, such as die-cast aluminum. Various alloys can be used which have suitable properties such as strength, stiffness, plastic deformability, chemical resistance, thermal expansion, heat capacity, etc.

Also within the scope of the present invention is a fluid line for a fluid line connection system according to the invention. The fluid line according to the invention can be attached to a passage opening in a housing wall in a particularly simple, safe and clean manner.

Further advantages of the invention will become apparent from the description and the drawings. The above-described and still further features according to the invention individually for to use one or more in any combination.

Brief description of the drawings

In the drawing show:

1 an embodiment of a fluid line connection system according to the invention with a housing and a fluid line in a schematic sectional view;

2 a connecting piece of the fluid line connecting system according to the invention of 1 in a schematic sectional view;

3 a section of the housing of 1 with a through-passage and a reinforcing sleeve in a schematic sectional view.

Embodiments of the invention

1 shows a schematic side view of an exemplary embodiment of a fluid line connection system according to the invention 10 , The fluid line connection system 10 includes a fluid line 12 and a housing 14 ,

The fluid line 12 here is a hose segment 16 , at the one end a connecting piece 18 is arranged. The connection between the hose segment 16 and the connecting piece 18 is here schematically as Pressverband 20 shown. According to the invention, any other types of compound can be used at this point.

The housing 14 has a housing wall 22 on. The housing wall 22 is here from a plastic, z. As polyamide formed. In the housing wall 22 is a through-hole 24 educated. In the through-hole 24 is a reinforcing sleeve 26 embedded. The armor sleeve 26 serves to Aufnhame (attachment) of the connecting piece 18 on the housing 14 , In 1 is the case 14 highly abstracted as a filter housing shown. In the case 14 can be a filter element 28 be arranged.

2 shows the connection piece 18 from 1 enlarged in a schematic sectional view. In 3 is a section of the case 14 in an area at the through-hole 24 enlarged illustrated in a schematic cross section. The illustrated embodiment of the fluid line connection system according to the invention 10 is described below by making a synopsis of the 1 to 3 described.

The armor sleeve 26 may be formed as an aluminum injection molded part. The armor sleeve 26 limited inside circumference a portion of the through-hole 24 , The armor sleeve 26 is in the housing wall 22 embedded. The housing wall 22 is formed here by a plastic matrix. The housing 14 can therefore be referred to as a hybrid housing with an endoskeleton. The armor sleeve 26 can do this from the plastic of the housing wall 22 to be splashed. The armor sleeve 26 For example, it can be positioned as an insert therein before closing the injection molding tool so as to be surrounded by the plastic material during the injection process. The armor sleeve 26 is formed circumferentially closed circumferentially. To improve the connection of the reinforcing sleeve 26 to the housing wall 22 the Armierungshülse can housing wall side (ie on the Armierungshülse 26 outer peripheral side and / or front side) at least in sections, a ribbing 30 exhibit. The ribbing 30 is here outside circumference of the Armierungshülse 26 by circumferential ribs 32 and grooves 34 educated. Through the ribbing 30 can be a pulling or twisting of the Armierungshülse 26 from or in the through-hole 24 by additional positive connection between the Armierungshülse 26 and the housing wall 22 be further avoided.

At one end is the connecting piece 18 with the hose segment 16 the fluid line 12 connected. The connecting piece 18 is preferably with a continuous longitudinal recess 36 educated. Through the longitudinal recess 36 can the through-hole 24 of the housing 14 fluidic with the fluid line 12 get connected.

The connecting piece 18 has a self-tapping external thread 38 on. The self-tapping external thread 38 serves to fasten the connecting piece 18 on the armor sleeve 26 , When screwing in the connecting piece 18 with the self-tapping external thread 38 in the armor sleeve 26 becomes the armor sleeve 26 locally plastically deformed, leaving in the armor sleeve 26 a mating thread 40 is formed. It can thus with low assembly and manufacturing costs a mechanically stable connection of the connecting piece 18 with the housing 14 to be obtained. The connecting piece 18 can be made of steel, preferably hardened steel. This can ensure that the connection piece 18 harder than the armor sleeve 26 made of aluminum or an aluminum alloy.

For screwing in the connecting piece 18 in the armor sleeve 26 can the connection piece 18 with a key area 42 be provided. The key area 42 can, for example, with an open-end wrench or socket wrench (not shown) are operated.

The connecting piece 18 has a shoulder 44 on. The shoulder 44 serves for axial support on an outer end face 46 the armor sleeve 26 , This allows a defined screw-in depth of the connection piece 18 in the through-hole 24 be set up. Furthermore, by planting the shoulder 44 at the frontal area 46 the armor sleeve 26 be achieved that an introduction of force from the connecting piece 18 in the case 14 over the armor sleeve 26 he follows.

To seal the connection of the fluid line 12 with the housing 14 can the fluid line connection system 10 a sealing element 48 exhibit. The sealing element 48 can be between the connecting piece 18 and the housing wall 22 to be ordered. The seal can be decoupled from mechanical loads, as the connection piece 18 on the armor sleeve 26 supports while sealing directly to the housing 14 , more precisely on the sealing surface 56 can be done.

The sealing element 48 is formed here by an O-ring. The sealing element 48 is typically made of a rubber-elastic material. The O-ring, here the sealing element 48 forms acts as a radial sealing element in the illustrated embodiment.

The connecting piece 18 can be a gasket holder 50 exhibit. The gasket holder 50 is formed here by a circumferential groove. The connecting piece here has an extension 52 on, which is deeper than the self-tapping external thread 38 in the through-hole 24 of the housing 14 is insertable. The seal holder is here on the extension 52 educated. The front can be the extension 52 with a chamfer 53 be executed. The chamfer 53 can be the assembly of the sealing element 48 in the gasket holder 50 and inserting the connecting piece 18 in the through-hole 24 facilitate.

The housing 14 can a sealing section 54 exhibit. At the sealing section 54 is preferably a sealing surface 56 educated. In on the case 14 assembled state of the connecting piece 18 can the sealing element 48 at the sealing surface 56 of the sealing section 54 issue. The sealing surface 56 is here on the inner circumference side circumferential to the through hole 24 educated. In particular, the sealing surface is here on the plastic of the housing wall 22 and not on the armor sleeve 26 arranged. The sealing surface 56 is still concentric with the through-hole 24 aligned. Thus, the sealing surface 56 and the through-hole 24 a common longitudinal axis 58 on. Also an inner circumference 60 the armor sleeve 26 here is concentric with the longitudinal axis 58 arranged.

When screwing in the connecting piece 18 forms its self-tapping external thread 38 on the inner circumference 60 the armor sleeve 26 the mating thread 40 plastically. The self-tapping external thread 38 thus becomes concentric with the longitudinal axis 58 on the housing 14 arranged. Thus falls in the assembled state, a nozzle axis 62 with the longitudinal axis 58 together. This can continue the sealing element 48 concentric with the sealing surface 56 be aligned. Thus, a uniform contact pressure of the sealing element 48 to the sealing surface 56 and to the gasket holder 50 be set up across the entire scope.

The diameter 64 of the sealing section 56 is smaller than the inside diameter 66 the armor sleeve 26 , Preferably, the inner diameter 66 the armor sleeve 26 so big, that's the seal holder 50 of the connecting piece 18 held sealing element 48 through the armor sleeve 26 can be passed through without touching them. The diameter 64 the sealing surface 56 on the other hand is so small that the sealing element 48 sufficiently strong between the connection piece 18 and the housing wall 22 is pressed. The diameter 64 the sealing surface 56 Here is 15% smaller than the inner diameter 66 the armor sleeve 26 , The diameter 66 the armor sleeve 26 can at the Armierungshülse 26 be measured before the connection piece 18 under formation of the counter thread 40 in the armor sleeve 26 was screwed.

Between the reinforcing hoses 18 and the sealing section 54 can be an insertion bevel 68 for the connection piece 18 inside on the housing wall 22 be educated. In the area of the insertion bevel 68 the through-hole widens 24 down to the diameter 64 the sealing surface 54 , This will cause the insertion of the connection piece 18 in the through-hole 24 facilitated. In particular, the sealing element 48 during installation at the insertion bevel 68 Slip it down to the sealing surface 56 to come to rest. Thus, damage to the seal member 48 be avoided.

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

• EP 2177725 B1 [0003]
• DE 202008003341 U1 [0004]
• DE 102010036596 A1 [0005]
• EP 1939467 A2 [0005]

Claims (13)

Fluid line connection system ( 10 ), in particular for the motor vehicle sector, comprising: - a fluid line ( 12 ), which at one end has a connecting piece ( 18 ) having; - a housing ( 14 ), in particular filter housing, with a housing wall ( 22 ), which consists at least partially of plastic and which has a passage recess ( 24 ) for the connection of the fluid line ( 12 ), wherein the through-passage ( 24 ) on the inner circumference side, at least in sections, by an annularly closed reinforcing sleeve ( 26 ) is limited in the plastic material of the housing ( 14 ) and wherein the connecting piece ( 18 ) with a self-tapping external thread ( 38 ) is provided to this under plastic formation of a counter-thread ( 40 ) in the armor sleeve ( 26 ) in the through-hole ( 24 ). Fluid line connection system according to claim 1, characterized in that the reinforcing sleeve ( 26 ) at the housing wall at least in sections a ribbing ( 30 ) having. Fluid line connection system according to at least one of the preceding claims, characterized in that the fluid line connection system ( 10 ) a sealing element ( 48 ) for sealing the connecting piece ( 18 ) against the housing ( 14 ) having. Fluid line connection system according to claim 3, characterized in that the connecting piece ( 18 ) a seal receiver ( 50 ), in which the sealing element ( 48 ) is arranged. Fluid line connection system according to claim 3 or 4, characterized in that the sealing element ( 48 ) is a radial sealing element or an axial sealing element. Fluid line connection system according to at least one of claims 3 to 5, characterized in that the housing ( 14 ) a sealing section ( 54 ) with a sealing surface ( 56 ) for conditioning the sealing element ( 48 ), which to Durchgangsausnehmung ( 24 ) is concentric. Fluid line connection system according to at least one of claims 4 to 6, characterized in that the seal receiver ( 50 ) of the connecting piece ( 18 ) between the self-tapping external thread ( 38 ) and a free end of the connecting piece ( 18 ), wherein the seal receiver ( 50 ) in a mounting state of the fluid line connection system ( 10 ) in the sealing section ( 54 ) of the housing ( 14 ) is arranged. Fluid line connection system according to claim 6 or 7, characterized in that a diameter ( 64 ) of the sealing section ( 54 ) is smaller than a (clear) inner diameter ( 66 ) of the reinforcing sleeve ( 26 ). Fluid line connection system according to claim 8, characterized in that the housing ( 14 ) between the reinforcing sleeve ( 26 ) and the sealing section ( 54 ) an insertion bevel ( 68 ) for the connecting piece ( 18 ) having. Fluid line connection system according to at least one of the preceding claims, characterized in that the connecting piece ( 18 ) one shoulder ( 44 ) to the axial support on the Armierungshülse ( 26 ) having. Fluid line connection system according to one of the preceding claims, characterized in that the connecting piece ( 18 ) is made of steel. Fluid line connection system according to at least one of the preceding claims, characterized in that the reinforcing sleeve ( 26 ) made of metal, in particular aluminum or a non-ferrous metal. Fluid line ( 12 ) for a fluid line connection system ( 10 ) according to at least one of the preceding claims.

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