U.S. patent application number 14/294657 was filed with the patent office on 2015-06-04 for seal.
This patent application is currently assigned to CARL FREUDENBERG KG. The applicant listed for this patent is Carl Freudenberg KG. Invention is credited to Markus CLEMENS, Ralf HELDMANN, Ernst JAKOB, Gunter ZIEGLER.
Application Number | 20150152754 14/294657 |
Document ID | / |
Family ID | 51900069 |
Filed Date | 2015-06-04 |
United States Patent
Application |
20150152754 |
Kind Code |
A1 |
HELDMANN; Ralf ; et
al. |
June 4, 2015 |
Seal
Abstract
A seal including a sealing ring (1) made from an elastomeric
material, an intermediate ring (2) made from a polymeric material,
and a supporting ring (3), the sealing ring (1), the intermediate
ring (2) and the supporting ring (3) being arranged concentrically
with respect to one another, and the sealing ring (1) and the
supporting ring (3) being arranged in each case on the sides of the
intermediate ring (2) which face away axially from one another. The
sealing ring (1), the intermediate ring (2), and the supporting
ring (3) form a pre-assembled unit (4).
Inventors: |
HELDMANN; Ralf;
(Wald-Michelbach, DE) ; CLEMENS; Markus;
(Reichelsheim, DE) ; JAKOB; Ernst; (Rimbach,
DE) ; ZIEGLER; Gunter; (Mannheim, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Carl Freudenberg KG |
Weinheim |
|
DE |
|
|
Assignee: |
CARL FREUDENBERG KG
Weinheim
DE
|
Family ID: |
51900069 |
Appl. No.: |
14/294657 |
Filed: |
June 3, 2014 |
Current U.S.
Class: |
277/502 |
Current CPC
Class: |
F01L 3/08 20130101; F16J
15/3236 20130101; F16J 15/166 20130101 |
International
Class: |
F01L 3/08 20060101
F01L003/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 3, 2013 |
DE |
10 2013 018 108.9 |
Claims
1. A seal, comprising a sealing ring (1) made from an elastomeric
material, an intermediate ring (2) made from a polymeric material
and a supporting ring (3), the sealing ring (1), the intermediate
ring (2) and the supporting ring (3) being arranged concentrically
with respect to one another, and the sealing ring (1) and the
supporting ring (3) being arranged in each case on the sides of the
intermediate ring (2) which face away axially from one another,
characterized in that the sealing ring (1), the intermediate ring
(2) and the supporting ring (3) form a pre-assembled unit (4).
2. The seal according to claim 1, wherein the intermediate ring (2)
is connected in each case in a material-to-material manner to the
sealing ring (1) and the supporting ring (3).
3. The seal according to claim 1, wherein the sealing ring (1) is
composed of an FKM material.
4. The seal according to claim 3, wherein the FKM material has a
Shore A hardness of from 60 to 90.
5. The seal according to claim 1, wherein the intermediate ring (2)
is composed of a PA6.6 material.
6. The seal according to claim 1, wherein that the supporting ring
(3) is composed of a metallic or a sintered material.
7. The seal according to claim 1, wherein the sealing ring (1) has
at least one axial sealing lip (5) on the side which faces axially
away from the intermediate ring (2).
8. The seal according to claim 1, wherein, on the side which faces
axially away from the intermediate ring (2), the sealing ring (1)
has a radially inner (5.1) and a radially outer axial sealing lip
(5.2) which are assigned to one another adjacently at a radial
spacing.
9. The seal according to claim 1, wherein, on the side which faces
the intermediate ring (2) axially, the sealing ring (1) has an
annular positioning projection (6) which is arranged in a
congruently designed depression (7) of the intermediate ring
(2).
10. The seal according to claim 1, wherein, on its side which faces
axially away from the sealing ring (1), the intermediate ring (2)
has a holding claw (8) which engages in a positively locking manner
behind an undercut (9) of the supporting ring (3).
11. The seal according to claim 1, wherein the supporting ring (3)
has an annular supporting face (10) on the end side which faces
axially away from the intermediate ring (2).
12. The seal according to claim 1, wherein those faces of the
sealing ring (1), intermediate ring (2) and supporting ring (3)
which adjoin one another in an adjacent manner are in bearing
contact with one another in a gap-free manner.
13. Use of the seal according to claim 1 for sealing an injection
valve of an internal combustion engine.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit and priority of German
Application No. 10 2013 018 108.9, filed Dec. 3, 2013. The entire
disclosure of the above application is incorporated herein by
reference.
FIELD
[0002] The present disclosure relates to a seal, comprising a
sealing ring made from an elastomeric material, an intermediate
ring made from a polymeric material and a supporting ring, the
sealing ring, the intermediate ring and the supporting ring being
arranged concentrically with respect to one another, and the
sealing ring and the supporting ring being arranged in each case on
the sides of the intermediate ring which face away axially from one
another.
BACKGROUND AND SUMMARY
[0003] A seal of this type is known generally, the sealing ring,
the intermediate ring and the supporting ring being manufactured in
each case separately and being completed to form a seal assembly
during mounting on a machine element to be sealed.
[0004] Here, all the rings of the seal assembly are supported
without adhesion on the respectively axially adjacent rings.
[0005] The mounting of the above-described seal is complicated and
relatively unreliable in terms of process, because the individual
rings have to be completed to form the seal during the mounting on
the machine element to be sealed. In particular, the sealing ring
can be damaged easily during mounting. On account of relatively
inexact positioning of the respective rings relative to one another
and on account of a possible gap extrusion of the sealing ring, the
seal achieves merely a relatively unsatisfactory sealing
result.
[0006] The present disclosure is based on the object of developing
a seal of the type mentioned at the outset, in such a way that said
seal can be mounted more simply on the machine element to be
sealed, that the risk of damage to the individual rings, of which
the seal consists, is reduced to a minimum, and that the seal has
constantly satisfactory use properties during a long service
life.
[0007] According to the present disclosure, this object is achieved
by way of a seal including a sealing ring made from an elastomeric
material, an intermediate ring made from a polymeric material, and
a supporting ring; the sealing ring, the intermediate ring, and the
supporting ring being arranged in each case on the sides of the
intermediate ring which face away axially from one another,
characterized in that the sealing ring, the intermediate ring, and
the supporting ring form a preassembled unit.
[0008] It is further provided that the sealing ring, the
intermediate ring and the supporting ring form a pre-assembled
unit.
[0009] Here, it is advantageous that the mounting of the seal on
the machine element to be sealed is simplified substantially as a
result. The sealing ring, the intermediate ring and the supporting
ring are first of all completed to form the pre-assembled unit. The
pre-assembled unit is then mounted as a single-piece entirety on
the machine element to be sealed.
[0010] As a result, the mounting of the seal on the machine element
to be sealed is simplified as far as possible and the risk of
damage to the rings is also reduced to a minimum as a result of the
rings being combined to form the pre-assembled unit.
[0011] By virtue of the fact that a relative displacement, in
particular an eccentric movement of the rings relative to one
another, is ruled out by way of the combination to form the
pre-assembled unit, the rings, of which the seal consists, always
have an exact and ideal position relative to one another. This
great dimensional accuracy of the pre-assembled unit aids a
satisfactory sealing result of the seal during a long service
life.
[0012] It can be provided according to one advantageous refinement
that the intermediate ring is connected in each case in a
material-to-material manner to the sealing ring and the supporting
ring. As a result of the material-to-material connection, leaks in
the region of the joints between the rings which adjoin one another
in each case in a contiguous manner are ruled out. Moreover, it is
advantageous that the rings are positioned particularly exactly
with respect to one another permanently as a result of the
material-to-material connection, and the seal overall is
particularly dimensionally accurate. In particular, on account of
the material-to-material connection, there are no eccentricities of
the individual rings relative to one another which impair the use
properties. Overall, the seal has only very low mounting and
sealing gaps, and the gap extrusion, in particular of the sealing
ring, is reduced to a minimum.
[0013] The sealing ring can be composed of an FKM material.
Fluororubbers have satisfactory resistance to most media to be
sealed and satisfactory resistance to high and low temperatures. A
material of this type is therefore satisfactorily suitable for a
sealing ring.
[0014] Moreover, fluororubbers with different specifications which
are adapted to the respective application are available
inexpensively.
[0015] For many applications, it has proven advantageous if the FKM
material which is used has a Shore A hardness of from 60 to 90. A
Shore A hardness of this type has been proven, in particular, when
the seal is used as a high-pressure seal. High-pressure
applications prevail, for example, if injection valves of an
internal combustion engine are sealed. In cases of this type,
pressures of up to approximately 450 bar have to be sealed. Even
when they are used as high pressure seals, sealing rings having the
stated Shore A hardness have constantly satisfactory use properties
during a long service life.
[0016] According to a further advantageous refinement, the
intermediate ring can be composed of a PA6.6 material. The use of a
material of this type is advantageous because it has very
satisfactory strength and durability, and satisfactory resistance
to most of the materials to be sealed.
[0017] The supporting ring can be composed of a metallic or a
sintered material. Supporting rings made from metallic materials
can be manufactured particularly simply and inexpensively; in
contrast, supporting rings made from sintered material have
particularly high strength and particularly low wear during the use
as intended of the seal.
[0018] The sealing ring can have at least one axial sealing lip on
the side which faces axially away from the intermediate ring.
[0019] Depending on the respective conditions of the application,
it can be provided as an alternative that, on the side which faces
axially away from the intermediate ring, the sealing ring has a
radially inner and a radially outer axial sealing lip which are
assigned to one another adjacently at a radial spacing.
[0020] The refinement with the radially inner and the radially
outer axial sealing lip brings about a self-reinforcing sealing lip
geometry which spreads the intermediate ring open as a result of
the hydrostatic pressure and therefore prevents a gap extrusion of
the sealing ring.
[0021] The prevailing pressure from the fuel supply presses the
elastomer onto the intermediate ring, and, as a result of its end
side which faces the sealing ring being spread open radially, said
intermediate ring closes the radial mounting gaps, with the result
that a gap extrusion of the elastomer is largely avoided.
[0022] On the side which faces the intermediate ring axially, the
sealing ring can have an annular positioning projection which is
arranged in a congruently designed depression of the intermediate
ring. It is advantageous here that the surfaces of the sealing ring
and intermediate ring which make contact with one another are
enlarged as a result of the positioning projection of the sealing
ring and the depression in the intermediate ring. As a result, a
particularly long-term connection of the two rings to one another
can be brought about, for example by way of a material-to-material
connection. Moreover, the positioning of the sealing ring and
intermediate ring relative to one another during the manufacture of
the seal is simplified. The manufacture of the seal is particularly
reliable in terms of process as a result.
[0023] On its side which faces axially away from the sealing ring,
the intermediate ring can have a holding claw which engages in a
positively locking manner behind an undercut of the supporting
ring. If the intermediate ring and the supporting ring are fixed on
one another in an exclusively positively locking manner, the metal
disk can be detached in a destruction-free manner from the
intermediate ring and can be recycled in a correctly sorted manner
following the use of the seal.
[0024] A particularly long-term connection between the intermediate
ring and the supporting ring can be achieved by virtue of the fact
that said rings are connected to one another not only in a
positively locking manner but also, moreover, in a
material-to-material manner. The joint between said two rings is
absolutely tight as a result of the additional material-to-material
connection.
[0025] The supporting ring can have an annular supporting face on
the end side which faces axially away from the intermediate ring.
If, for example, the seal is used to seal an injection valve of an
internal combustion engine, the annular supporting face serves as a
mounting stop for the injection valve to be mounted.
[0026] Those faces of the sealing ring, intermediate ring and
supporting ring which adjoin one another in an adjacent manner can
preferably be in bearing contact with one another in a gap-free
manner. As a result, the seal has satisfactory dimensional
stability, and a satisfactory sealing action is aided by way of
said gap-free contact.
[0027] Moreover, the present disclosure relates to the use of an
above-described seal for sealing an injection valve of an internal
combustion engine.
[0028] Seals for sealing an injection valve of an internal
combustion engine have up to now been of multiple-part
construction. Here, a previously known seal comprises, for example,
a sealing ring which is configured as an O-ring, and a PTFE ring
which adjoins the former on the end side on one side, an
intermediate ring made from a polymeric material being arranged on
that side of the PTFE ring which faces axially away from the
O-ring. A metal disk is arranged on that side of the intermediate
ring which faces axially away from the PTFE ring.
[0029] The PTFE ring is provided to close the predefined mounting
gaps radially by way of deformation upon pressure loading. In the
invention which is claimed here, this is ensured with the aid of
the intermediate ring or the self-reinforcing lip contour of the
axial sealing lip.
DRAWINGS
[0030] One exemplary embodiment of the seal according to the
present disclosure will be explained in greater detail in the
following text using the FIGURE:
[0031] The FIGURE shows one exemplary embodiment of the seal
according to the present disclosure in a diagrammatic illustration.
The seal is formed by the pre-assembled unit 4, the pre-assembled
unit 4 comprising the sealing ring 1, the intermediate ring 2 and
the supporting ring 3.
DETAILED DESCRIPTION
[0032] In the exemplary embodiment which is shown here, the sealing
ring 1 is composed of an elastomeric material, the intermediate
ring 2 is composed of a polymeric material and the supporting ring
3 is composed of a metallic material.
[0033] The sealing ring 1, the intermediate ring 2 and the
supporting ring 3 are arranged concentrically with respect to one
another and are connected to one another in a material-to-material
manner.
[0034] The seal which is shown is used to seal an injection valve
of an internal combustion engine, the seal having the sealing ring
1 on the end side at one end and the supporting ring 3 on the end
side at the other end. On its side which faces axially away from
the intermediate ring 2, the sealing ring 1 has a radially inner
axial sealing lip 5.1 and a radially outer axial sealing lip 5.2
which are assigned to one another adjacently at a radial spacing.
The radially inner axial sealing lip 5.1 seals radially to the
outside with respect to the rail connection opening, whereas the
radially outer axial sealing lip 5.2 seals the fuel-conducting
connection on the injection valve radially to the inside.
[0035] On that side of the seal which faces axially away from the
axial sealing lips 5.1, 5.2, the annular supporting face 10 is
provided as a constituent part of the supporting ring.
[0036] In the exemplary embodiment which is shown here, all the
rings, of which the pre-assembled unit 4 consists, are connected to
one another in a material-to-material manner. As a result, the
joints between the individual rings are absolutely tight and the
seal can be handled in a particularly simple manner because the
installer charged with mounting merely has to mount the
pre-assembled unit 4 in its entirety. The risk of mounting errors
is reduced to a minimum as a result.
[0037] The annular positioning projection 6 of the sealing ring 1
bears tightly against the congruently designed depression 7 of the
intermediate ring 2; the intermediate ring 2 has a holding claw 8
which engages into an undercut 9 of the supporting ring 3 in a
positively locking manner.
[0038] The seal according to the present disclosure can be
manufactured simply and inexpensively and can be handled without
problems.
* * * * *