U.S. patent application number 16/199804 was filed with the patent office on 2019-05-30 for filter device, especially liquid filter.
The applicant listed for this patent is MANN+HUMMEL GmbH. Invention is credited to Guenter JOKSCHAS, Heike KLUSON-HESSLINGER, Andre ROESGEN, Martin WEINDORF.
Application Number | 20190160398 16/199804 |
Document ID | / |
Family ID | 40545964 |
Filed Date | 2019-05-30 |
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United States Patent
Application |
20190160398 |
Kind Code |
A1 |
JOKSCHAS; Guenter ; et
al. |
May 30, 2019 |
Filter Device, Especially Liquid Filter
Abstract
A filter device comprises a hollow cylindrical filter element in
a filter housing. The fluid that is to be purified is to radially
flow through the filter element. The interior of the filter element
forms an axial flow chamber for the fluid. An end plate is arranged
on the front side of the filter element. An annular neck, onto
which a sealing element is injection-molded, is connected to the
end plate.
Inventors: |
JOKSCHAS; Guenter;
(Murrhardt, DE) ; KLUSON-HESSLINGER; Heike;
(Freiberg, DE) ; ROESGEN; Andre; (Remshalden,
DE) ; WEINDORF; Martin; (Kornwestheim, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MANN+HUMMEL GmbH |
Ludwigsburg |
|
DE |
|
|
Family ID: |
40545964 |
Appl. No.: |
16/199804 |
Filed: |
November 26, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14335898 |
Jul 19, 2014 |
10137390 |
|
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16199804 |
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|
12810198 |
Oct 12, 2010 |
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14335898 |
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|
12332612 |
Dec 11, 2008 |
8157107 |
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12810198 |
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PCT/EP2008/067904 |
Dec 18, 2008 |
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12332612 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B01D 2201/291 20130101;
B01D 2201/34 20130101; B01D 29/21 20130101; B01D 35/005 20130101;
B01D 29/15 20130101 |
International
Class: |
B01D 29/15 20060101
B01D029/15; B01D 29/21 20060101 B01D029/21; B01D 35/00 20060101
B01D035/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 14, 2007 |
DE |
20 2007 017 614.7 |
Dec 21, 2007 |
DE |
20 2007 018 076.4 |
Claims
1. A filter device for filtering a liquid, comprising: a hollow
cylindrical filter element (2) for arrangement in a filter housing
(3) that is radially to be flowed through by the fluid to be
purified; wherein an open interior of the filter element (2) forms
an axial flow space for the fluid in the interior; the filter
element further comprising: a terminal disk (4) arranged on an
axial end face of the filter element (2), the terminal disk having
an open central portion opening through the end disk into the
interior; a first axially projecting annular socket (6) having a
first axial end secured onto the terminal disk, the first annular
socket including an axially outwardly projecting annular wall (6)
circumferentially surrounding the open central portion; and a
sealing element arranged on the first annular socket over at least
a portion of the annular wall, the sealing element operative to
form a seal between the terminal end disk (4) and the filter
housing to seal between a raw side and a clean side of the filter
element; wherein the sealing element comprises sealing material (8)
injection-molded onto the first axially projecting annular socket
(6); a second axially projecting annular socket (9) having an axial
end secured onto the terminal disk (4) and arranged concentrically
to the first socket (6), the second annular socket (9) including an
axially outward projecting annular wall surrounding the open
central portion; and a sealing element arranged on the second
annular socket (9) over at least a portion of the annular wall, the
sealing element operative to form a seal between the terminal end
disk (4) and the filter housing (3); wherein the sealing element
comprises sealing material (8) injection-molded onto the second
annular socket.
2. The filter device of claim 1, wherein the axially projecting
annular sockets are formed monolithically and in one piece with the
terminal disk.
3. The filter device of claim 1, wherein the sealing material is
comprised of a silicone material.
4. The filter device of claim 3, wherein the silicone material is a
fluorine-silicone-rubber (FVMQ).
5. The filter device of claim 1, wherein at least one of the
annular sockets includes shaped elements formed thereon and
configured to improve adhesion of the sealing element onto the
annular socket.
6. The filter device of claim 5, wherein the shaped elements are
embodied as cutouts extending radially through and formed into the
annular wall of at least one of the annular sockets.
7. The filter device of claim 1, wherein the sealing material is
injection-molded onto the inner side, the outer side, and the free
end face of the sockets.
8. A hollow cylindrical filter element (2) for filtering a liquid
for arrangement in a filter housing (3), wherein the filter element
(2) is radially to be flowed through by a fluid to be purified;
wherein an open interior of the filter element (2) forms an axial
flow space for the fluid in the interior; the filter element
comprising: a terminal disk (4) arranged on an axial end face of
the filter element (2), the terminal disk having an open central
portion opening through the end disk into the interior; a first
axially projecting annular socket (6) having a first axial end
secured onto the terminal disk, the first annular socket including
an axially outwardly projecting annular wall (6) circumferentially
surrounding the open central portion; and a sealing element
arranged on the first annular socket over at least a portion of the
annular wall, the sealing element operative to form a seal between
the terminal end disk (4) and the filter housing to seal between a
raw side and a clean side of the filter element; wherein the
sealing element comprises sealing material (8) injection-molded
onto the first axially projecting annular socket (6); a second
axially projecting annular socket (9) having an axial end secured
onto the terminal disk (4) and arranged concentrically to the first
socket (6), the second annular socket (9) including an axially
outward projecting annular wall surrounding the open central
portion; and a sealing element arranged on the second annular
socket (9) over at least a portion of the annular wall, the sealing
element operative to form a seal between the terminal end disk (4)
and the filter housing (3); wherein the sealing element comprises
sealing material (8) injection-molded onto the second annular
socket.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application Ser.
No. 14/335,898, filed Jul. 19, 2014, which is a continuation of
U.S. application Ser. No. 12/810,198 filed Oct. 12, 2010, which is
a continuation of PCT/EP2008/067904, filed Dec. 18, 2008
designating the United States of America, and a continuation in
part of U.S. application Ser. No. 12/332,612, filed Dec. 11, 2008,
now U.S. Pat. No. 8,157,107. The entire disclosure of the above
applications is incorporated herein by reference. Priority is
claimed based on German patent application 20 2007 018 076.4 filed
in Germany on Dec. 21, 2007 and German patent application 20 2007
017 614.7 filed in Germany on Dec. 14, 2007
TECHNICAL FIELD
[0002] The invention concerns a filter device, especially a liquid
filter, such as a fuel filter or oil filter, according to the
preamble of claim 1.
PRIOR ART
[0003] A filter device that is used as an oil filter or a fuel
filter is disclosed in DE 197 46 752 A1. The filter device
comprises a hollow cylindrically embodied filter element that is
secured on a radially inwardly positioned support structure and is
flowed through by the fluid to be purified radially from the
exterior to the interior wherein the filter interior forms an axial
discharge passage for the purified fluid. The filter element is
framed by terminal disks at the end faces that have a central
cutout for discharging the fluid from the filter interior. In the
central cutout of the terminal disk a sealing ring is inserted that
is supported on an inner housing wall and separates the axial
discharge space from the inflow side of the filter element. Such
sealing elements are mandatorily required for a flow-tight
separation of raw side and clean side.
SUMMARY OF THE INVENTION
[0004] The invention has the object to separate with simple means
and in a space-saving as well as effective way the raw side from
the clean side in a filter device.
[0005] This object is solved according to the invention with the
features of claim 1. The dependent claims provide expedient further
embodiments.
[0006] The filter device has in a filter housing a hollow
cylindrical filter element that is to be flowed through by the
fluid to be purified in radial direction. The interior of the
filter element forms an axial flow space. At one end face of the
filter element there is a terminal disk where the sealing element
is arranged. According to the invention, this sealing element is
injection-molded onto an axially projecting, annular socket that is
connected to the terminal disk.
[0007] With this embodiment different advantages are achieved. By
injection-molding the sealing element separate assembly steps are
no longer required that in an embodiment of the sealing element as
its own component, in particular as a sealing ring, would be
otherwise required. In the embodiment according to the invention,
it is instead sufficient to injection-mold, before mounting the
filter device, the sealing material onto the annular socket;
subsequently, the filter element including sealing disk and socket
together with the injection-molded sealing element can be inserted
into the filter housing. Leakage flows caused by mounting are
prevented in this way.
[0008] Moreover, the stability of the filter device is improved
because forces in the axial direction are transmitted substantially
from the socket onto the filter housing. This means that the
sealing element is positioned between the end face of the socket
and the inner wall of the filter housing; since this section of the
sealing element is however usually very thin-walled, a tilted
positioning of the filter device that could lead to leakage flows
is not to be expected as a result of the deformation of the sealing
element.
[0009] According to an advantageous embodiment, the sealing element
is comprised of an injection-moldable silicone material, in
particular a fluorosilicone rubber (FVMQ) that is characterized by
an excellent fuel resistance, in particular by excellent diesel
fuel resistance and therefore in a special way is suitable for use
in fuel filters.
[0010] According to a further advantageous embodiment, the socket
has shaped elements that contribute to an improved adhesion of the
sealing material on the socket. These shaped elements change the
surface of the socket and are embodied as projections or, according
to a preferred embodiment, as cutouts in the wall of the socket. In
the embodiment as cutouts, they can be distributed uniformly about
the circumference of the socket. During the injection molding step,
the sealing material will deposit on the shaped elements so that an
additional resistance with respect to accidental removal of the
sealing material from the socket is provided. In case of the
cutouts in the wall of the socket, the cutouts are advantageously
completely filled with the sealing material so that no leakage
flows through these cutouts may occur.
[0011] The sealing material is expediently injection-molded onto
the inner side, the outer side as well as the free end face of the
socket so that the best possible sealing action is achieved. Even
though, it is in principle sufficient to provide the sealing
material only on the inner side or only on the outer side or
optionally to provide the sealing material only on the end face of
the socket or on a combination of end face and inner side or outer
side of the socket.
[0012] The annular socket in its simplest embodiment is a cylinder
whose side walls and free end face form the support for the sealing
material. However, other geometries may be provided also for the
socket, for example, a socket with a cylindrically shaped section
and a further section angularly extending therefrom or a socket
with a slantedly extending wall that is positioned at an angle to
the plane at the terminal disk. The sealing material may extend
either about the entire inner side and outer side of the socket or,
according to a further embodiment, only across a partial area of
the socket, for example, on the angularly projecting section of the
socket.
[0013] According to yet another advantageous embodiment, two
concentric sockets are provided that are spaced apart radially from
one another wherein the sealing material is injection-molded onto
both sockets. Since each one of the two sealing elements is
provided with a sealing line, the sealing action is improved.
[0014] The socket is advantageously embodied as a monolithic part
of the terminal disk; both components can be manufactured of
injection-moldable plastic material. Basically, it is however also
possible to embody socket and terminal disk as two separate
components that are connected to one another
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Further advantages and expedient embodiments may be taken
from the additional claims, the figure description, and the
drawings. It is shown in:
[0016] FIG. 1 a perspective view of the lower part of a filter
device with a hollow cylindrical filter element whose end face is
framed by a terminal disk that is provided with a central cutout
for discharging the purified fluid, wherein the central cutout is
surrounded by a socket onto which sealing material is
injection-molded;
[0017] FIG. 2 a section view of the filter device according to FIG.
1 in the area of the socket;
[0018] FIG. 3 a section illustration of a further embodiment
according to which two sockets concentrically arranged relative to
one another are provided onto which sealing material is
injection-molded, respectively;
[0019] FIG. 4 a further embodiment in which the socket has
additionally an angularly arranged section that is a support for
the sealing element;
[0020] FIG. 5 a further embodiment in which the socket is comprised
of a slantedly extending wall that is formed monolithically with
the terminal disk; and
[0021] FIG. 6 a section view of a filter device having two sockets
concentrically arranged relative to one another and onto which
sealing material is injection-molded, respectively;
EMBODIMENTS OF THE INVENTION
[0022] In the Figures the same components are identified with same
reference numerals.
[0023] The filter devices illustrated in the Figures are suitable
for filtration of liquid or gaseous fluids, in particular for
filtering fuel such as diesel fuel or oil. Also, a use, for
example, as an air filter is possible.
[0024] The filter device 1 illustrated in FIG. 1 comprises a hollow
cylindrical filter element 2 in a filter housing 3 wherein the
filter element 2 is flowed through radially from the exterior to
the interior by the fluid to be purified so that the outer wall
surface represents the raw side and the axial interior in the
filter element represents the clean side from where the purified
fluid is discharged axially through the end face. The axial end
face of the filter element 2 is framed by a terminal disk 4 that
has a central cutout 5 that communicates with the axial interior of
the filter element 2. In the central cutout 5 a cylindrical socket
6 is inserted that advantageously is monolithically formed with the
terminal disk 4. In the wall of the socket 6 a plurality of cutouts
7 are provided that are distributed uniformly about the
circumference and penetrate the wall. The socket 6 is a support for
a sealing element 8 that is comprised of an injection-moldable
material, in particular of a silicone material such as partially
fluorinated liquid silicone (FVMQ) and is injection-molded onto the
socket 6. The sealing material is located on the outer side, the
inner side and the free end face of the socket 6 and covers also
completely the cutouts 7 in the wall of the socket 6. The cutouts 7
have the function of shaped elements that ensure improved adhesion
of the sealing material on the socket 6.
[0025] The selection of the sealing material depends on the fluid
to be purified. For use as a diesel fuel filter, advantageously the
aforementioned material FVMQ is used that is characterized by high
fuel resistance while at the same time providing excellent
injection molding properties.
[0026] As illustrated in the section view of FIG. 2, the socket 6
is formed monolithically with the terminal disk 4. The sealing
element 8 has two contact lines: on the one hand, in the area of
the free end face on the socket 6 and, on the other hand, at the
transition area between socket 6 and terminal disk 4 on the side
facing away from the central cutout 5. In the area of the two
contact lines the sealing element 8 has a greater wall thickness.
In order to design the seal to be more resistant with regard to
high pressure peaks, in a supplemental embodiment a
circumferentially extending reinforcement ring may be provided in
the area of the seal support. This ring is positioned
circumferentially below or on the seal 8. There is also the
possibility to employ high-strength sealing materials or sealing
materials that have a high tear resistance.
[0027] In the embodiment according to FIG. 3, on the terminal disk
4 a second socket 9 is provided that extends concentrically
relative to the first socket 6 but in comparison to the first
socket 6 has a smaller diameter. Also, the axial extension of the
second socket 9 is less than that of the first socket 6. The second
socket 9 is also formed as a monolithic part with the terminal disk
4 as is the first socket 6. The sealing element 8 is
injection-molded onto the first socket 6 as well as onto the second
socket 9 and extends along the inner side of the first socket 6, on
the inner and outer sides of the second socket 9 as well as in the
intermediate area on the terminal disk 4 between first and second
sockets 6 and 9, forming a generally U-shaped sealing element 8, as
shown in FIG. 3. Moreover, the two free end faces of the sockets 6
and 9 are covered with sealing material. The sealing element 8, at
the free end faces of the sockets 6 and 9, has a greater wall
thickness, forming bulbous shaped sealing members 8A, 8B on the
free end faces of the sockets 6 and 9, as clearly shown in FIG. 3.
The wall of the first socket 6 and second socket 9 may include a
plurality of cutouts 7 (see FIG. 1) distributed uniformly about the
circumference and penetrating the wall. The cutouts 7 (see FIG. 1)
have the function of shaped elements that ensure improved adhesion
of the sealing material on the sockets. The sealing material may be
located on the outer side, the inner side and the free end face of
the sockets cover also completely the cutouts in the wall of the
sockets, if present.
[0028] There are a total of two sealing lines between the sealing
element 8 and the filter housing or the components of the housing;
both sealing lines are located in the area of the free end faces of
the sockets 6 and 9.
[0029] In the embodiment according to FIG. 4, the cylindrical
socket 6 in the area of its end face is provided with a section 6a
that is radially inwardly angled at a 90 degree angle whose free
end face is a support of the injection-molded sealing element
8.
[0030] In the embodiment according to FIG. 5 the socket 6 that is a
monolithic part with the terminal disk 4 is angularly embodied; it
is positioned relative to the plane of the terminal disk 4 at an
angle deviating from 90 degrees and is oriented radially outwardly.
The sealing element 8 that is injection-molded on the socket 6
engages the end face of the socket as well as the inner side and
the outer side and has a relatively complex cross-sectional
geometry. Two sealing lines are formed by means of which the
sealing element 8 is seal-tightly supported on a further component
of the filter device.
[0031] Similar to the embodiment of FIG. 3, referring now to the
embodiment of FIG. 6, on the terminal disk 4 a second socket 9 is
provided that extends concentrically relative to the first socket 6
but in comparison to the first socket 6 has a smaller diameter, as
in FIG. 3. In FIG. 6 the axial extension of the second socket 9 may
be substantially the same as that of the first socket 6. The second
socket 9 is also formed as a monolithic part with the terminal disk
4 as is the first socket 6. The sealing element 8 may be
injection-molded onto the first socket 6 as well as onto the second
socket 9 and extends along the radially outer side of the first
socket 6, on the radially inner side of the second socket 9, and
may extend on the intermediate area on the terminal disk 4 between
first and second sockets 6 and 9, forming a continuous annular
sealing element 8, as shown in FIG. 6. Moreover, the two free end
faces of the sockets 6 and 9 are covered with sealing material. The
wall of the first socket 6 and/or the second socket 9 may include a
plurality of cutouts 7 (see FIG. 1) distributed uniformly about the
circumference and penetrating the wall. The cutouts 7 (see FIG. 1)
have the function of shaped elements that ensure improved adhesion
of the sealing material on the sockets. The sealing material may be
located on the outer side, the inner side and the free end face of
the sockets cover also completely the cutouts in the wall of the
sockets, if present. A drain passage 14 is shown, separated by a
double-concentric seal 15 from the filtered side as well as from
the unfiltered side of the filter element 2. The double-concentric
seal 15 may be produced by a two-component method, for example, by
injection molding a combination of hard and soft sealing
materials.
* * * * *