The invention relates to a pipe joint of a diameter extension
having pipe end of a pipe with a connection part and
DE 195 23 287 C2
. DE 40 32 554 C2
and DE 40 30 484 A1
each describe a solution in which a branch pipe is connectable to a high-pressure fuel rail. In this case, the tube also has at its end to be connected to a diameter extension, which can be pressed by a nut or a union nut against a pressure receiving surface of a connection element, wherein there is a washer between the diameter extension of the tube and the end face of the nut or nut.
Washer should obviously be damaged
prevent or reduce the head part or the diameter extension. disadvantage
of these solutions is that in the preparation of the compound
depending on the materials used, possibly existing
Coatings and surface roughness are the washer
when tightening the pipe screw or nut, rotate undefined
can and transfers unwanted torque to the pipe end,
causing it to twist and undefined squeezes
can be damaged. Another disadvantage is in
the partial or complete abrasion of any
existing coating due to the friction occurring.
In DE 24 07 268 A1
a pipe connection is described in which a connection between a connection body and a pipe is produced using a union nut and a metallic retaining ring. The tube has no diameter extension at its connection end. The metallic retaining ring has a stepped axial bore with circumferential teeth on the inner diameter, which interlock with the outer diameter of the tube. The outer, the teeth opposite area is frusto-conical and cooperates with an inner contact surface of the nut together. Furthermore, a toothing present in the end ring surface of the retaining ring cooperates with a toothing of the connection body. This solution is relatively expensive and affects the outer diameter of the tube over a relatively long range.
shows a lead pipe connection in which the pipe end has a diameter extension. Over the pipe end engages with a long cylindrical area a coupling sleeve, which rests with a collar on the diameter extension. The attachment to the connection head is made with a union nut, which engages with an inwardly directed paragraph on the collar of the coupling sleeve. The connection head has a profiling in the direction of the end face of the diameter extension of the tube resting against it, which ensures an anti-twist with the tube. This solution is also structurally complex.
Furthermore, the aforementioned pipe connections are either exclusively for connecting a pipe or gem. the in DE 44 25 827 A1
listed solution suitable only for connecting two pipes. Out EP 1624183 A1
is known a solution with which co-rotation of the pipe to be avoided when making the screw to avoid accidental loosening of the screw. For this purpose, the pipe connection device on at least one end formed as a bead end element, wherein the pipe at least partially surrounding separate pressure element is provided between the flange and a fitting, which rests against the flare back. When producing a screw connection of the fitting, the end face of the fitting acts on the flange by way of the pressure element and presses the sealing surface against the connection surface. In this case, the coefficient of friction of the contact between the sealing surface and the connection surface should be greater than the coefficient of friction of the contact of the pressure element and flange and greater than the coefficient of friction of the contact of the fitting and pressure element to prevent turning of the pipe when tightening the fitting. Since various factors influence the coefficients of friction, it may happen that the required friction coefficient conditions can not be met.
Out DE 1 843 459 A1
is a pipe joint is known, which should make it possible to stretch and seal smooth, fretless pipes and having a round cylindrical externally threaded connection body, which is provided with engagement surfaces for a key. The tube, which has no flare is connected at its end by gluing, welding or soldering to the connector body. The clamping and sealing of the pipes connected to the connector body by means of a union nut, in which an annular disc made of plastic is inserted and which is screwed to the connector body. At the connection body also another tube can be attached. The plastic ring disc can settle for prolonged use, whereby no more sealing effect is given.
The object of the invention is to develop a pipe connection, with which a functionally reliable pipe connection is ensured, the one with turning the tube avoids when tightening the connecting element and has a simple structural design.
Task is according to the invention with the features
of the 1st protection claim solved. Advantageous embodiments
emerge from the dependent claims.
the pipe connection according to the invention for attachment
at least one pipe end, which has a diameter extension
has, at a connection part by means of a fastening element
is according to the invention the diameter extension
by means of an adhesive bond against rotation when tightening the
can be the adhesive connection between connector and diameter extension
consist. Alternatively, it is possible to add an extra
Provide intermediate element, in which case the adhesive connection beforzugt
between the intermediate element and the diameter extension and / or
the intermediate element and the outer diameter of the first
Tube can be formed.
Intermediate element can be between the first diameter extension
and the fastening part or between the connection element and the first
Diameter extension be arranged or even between the first
Diameter extension and a second diameter extension
sitting a second tube end of a second tube.
Adhesive or the adhesive layer is depending on the design
the first and / or second diameter extension and / or the connection part and / or
applied to the intermediate element or is supplied before assembly Der
Glue is preferably made of instant adhesive, which immediately upon contact
Makes connection. Alternatively, the adhesive layer can be encapsulated
Adhesive included, only when tightening the fastener
is released by the surface pressure acting on it and
creates a material connection.
the intermediate element surrounds the tube and is in the form of a ring
points the intermediate element in the direction of the diameter extension
a contact surface, which provided with an adhesive layer
is and / or is the intermediate element at its inner diameter
provided with an adhesive layer. The glue can, however
be applied only during assembly.
Ensuring unintentional release of the
Fastening element, the intermediate element in the direction of the fastener with
be provided a locking teeth.
a defined feed or an alignment of the intermediate element
during assembly to avoid that the ratchet teeth on both
End faces are provided.
Way ensures the adhesive layer in addition
a seal of the pipe joint and can be elastic
is possible, a first tube with a first diameter extension
or a first pipe provided with a first diameter extension
and / or a second tube having a second diameter extension
comprises by means of an adhesive bond according to the invention
cohesively and rotationally fixed to the connection part
fasten, or with a corresponding intermediate element a cohesive
the solution according to the invention becomes a
simple, reliable and reliable pipe connection
created a damage to the pipe and a
possibly existing coating safely avoids.
is optionally possible one or two tubes with the
To connect connecting part and thereby through the adhesive connection
to prevent co-rotation of the pipe end (s).
have shown that with the invention
Solution best fitting properties with an optimal
Force-torque curve can be achieved, which was previously not possible
an exchange of appropriate pipe connections either by complete
Renewal of the piping system (eg for brake lines) or
sawed the pipe joints in case of partial damage
and being replaced by completely new connections is not
inevitably required, completely detachable connections
manufacture. In particular, the use of pipe joints in
Brake pipe systems is the invention
Invention will be described below with reference to embodiments
and associated drawing explained in more detail.
1 : Longitudinal section through a pipe joint for connection of the pipe end of a first tube using a first intermediate element in the screwed state, wherein the tube passes through the fastening part and between Zwi rule element and first diameter extension is an adhesive connection,
1a : Longitudinal section through the first ring gem. 1 .
2 FIG. 5: longitudinal section through a first ring, which has a locking toothing, FIG.
3 : Longitudinal section through a pipe connection for connecting a first pipe end and a second pipe end without intermediate element.
4 : Longitudinal section through a pipe connection for connecting a first pipe end and a second pipe end using an intermediate element.
In 1 and 3 pipe connections are shown, which is a connection part 1 and a fastener 2 and serve to connect a first pipe with a first pipe end R1 and / or a second pipe with a second pipe end R2. The attachment part 1 has a contact surface 1.1 and a bore having an inner diameter d1. To the contact surface 1.1 If necessary, the first or second pipe end R1, R2 can be joined using an annular intermediate element.
The longitudinal section through a pipe connection for connecting a first pipe end R1 using a connection part 1 , a fastener 2 in the form of a pipe screw and a first ring 3 is in 1 shown.
The first pipe end R1 has a first diameter extension R1.1 in the form of a flange and is frontally with the first diameter extension R1.1 to the contact surface 1.1 of the connection part 1 applied. The fastening part 2 points in the direction of the first diameter extension R1.1 a flat end surface 2.1 on and was here with its external thread 2.2 in the internal thread 1.2 of the connection part 1 screwed. Between the first diameter extension R1.1 of the tube R1 and the end face 2.1 of the fastening element 2 there is an intermediate element in the form of a ring 3 extending in the direction of the first diametric extension R1.1 a first end face 3.1 and toward the fastener 2 a second end face 3.2 having. Due to the inner diameter d2 of the fastener 2 and the inner diameter d3 of the first ring 3 extends the first pipe end R1. The first end face pointing in the direction of the first diametric extension R1.1 3.1 has an adhesive layer K on.
By acting in the axial direction tightening force F of the pipe connection was the first ring 3 by means of the connecting element 2 pressed against the first diameter extension R1.1, whereby by means of the adhesive between the first diameter extension R1.1 of the first tube R1 and the abutting end face 3.1 of the ring 3 A cohesive connection (adhesive bond) is produced .. Furthermore, the diameter extension R1.1 with its sealing surface sealing against the contact surface 1.1 of the connection part 1 pressed.
In 1a is the longitudinal section through the intermediate element 3 gem. 1 shown. The face 3.1 of the ring 3 is provided with an adhesive layer K.
Alternatively, gem. a variant, not shown, the intermediate element (the ring) in addition to its end face, which faces in the direction of the fastener to be provided with an adhesive layer having microencapsulations, wherein only after tightening the fastener, a material connection between the end face 3.2 of the ring 3 and the adjacent end face of the fastener is made. The microencapsulations open to this preferred only at a certain force or surface pressure.
2 shows a longitudinal section through a ring 3 standing at the front 3.1 with a locking toothing 3.3 is provided as anti-rotation to the fastening part and there has no adhesive layer. The adhesive layer K is located on the end face 3.1 of the ring 3 ,
In 3 the longitudinal section through a pipe connection for connecting a first pipe end R1 and a second pipe end R2 is shown in the screwed state, wherein no intermediate element has been used. The second tube end R2 protrudes through an inner diameter d1 of the connection part 1 and lies with its second diameter extension R2.1 (in the form of a flare) on the contact surface 1.1 of the connection part 1 at. At the second diameter extension R2.1, the first diameter extension R1.1 of the first tube R1 connects, on which the fastener 3 acts. The cohesive connection is in this case by adhesive layers K between the contact surface 1.1 of the connection part 1 and the adjacent thereto second diameter extension R2.1 and between the second diameter extension R2.1 and the adjacent first diameter extension R1.1.
causing between the intermediate element 3 and the first diameter extension a cohesive connection (adhesive bond) is generated. This was before mounting the Bördel / the second diameter extension R2.1 of the second tube R2 completely coated with adhesive. The fastener 2 act directly on the first diameter extension R1.1 of the first tube R1. When tightening the fastener 2 the first tube R1 does not rotate with the adhesive bond.
The longitudinal section through a pipe connection for connecting a first pipe end R1 and a second pipe end R2 using an intermediate element 3 in the bolted state, shows 4 , The second pipe end R2 also projects through an inner diameter d1 of the connection part 1 and is also here with its second diameter extension R2.1 (in the form of a flare formed) on the contact surface 1.1 of the connection part 1 at. The second diameter extension R1.1 of the first tube R1, adjoining the second diameter extension R2.1, is followed by an intermediate element in the form of a ring 3 by the tightening force F of the fastener 3 acts, eliminating between the ring 3 and the first diameter extension R1.1 a cohesive connection (adhesive bond) is generated. The ring 3 was at his forehead 3.1 , which points in the direction of the first diameter extension R1.1, provided with an adhesive layer K. The ring 3 points here only in the direction of the fastener 2 on his face 3.2 a locking toothing 3.3 on. The locking teeth 3.3 acts unintentional release of the fastener 2 opposite.
The cohesive connection ensures that the first tube R1 when tightening the fastener 2 does not rotate and the sliding of the end face of the fastener 2 on the ring 3 ( 1 and 3 ) takes place, without turning the first tube R1.
According to an embodiment not shown, the intermediate element (the ring 3 ) When connecting 2 pipe ends between the diameter expansions be arranged, then preferably a cohesive connection is made to both pipe ends and the intermediate element is provided at its two end faces and possibly also at its inner diameter and / or its outer diameter with an adhesive layer.
Furthermore, the intermediate element 3 already before the production of the pipe connection with the pipe end, in particular with the diameter extension or the outer diameter of the tube, which adjoins the diameter extension, be pre-assembled by a material connection (gluing).
- contact surface
- inner thread
- End face of the fastener 2
- external thread
- intermediate element
- locking teeth
- Inner diameter
of the connection part
- Inner diameter
of the fastening part
- Inner diameter of the first ring 3
- attractive force
QUOTES INCLUDE IN THE DESCRIPTION
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Cited patent literature
- - DE 19523287 C2 
- - DE 4032554 C2 
- - DE 4030484 A1 
- - DE 2407268 A1 
- US 1194766 
- - DE 4425827 A1 
- - EP 1624183 A1 
- - DE 1843459 A1