FR2816985A1 - I.C. engine liquid filter with automatic purge comprises removable filtering element with purge channel and sliding obturator which closes purge channel - Google Patents
I.C. engine liquid filter with automatic purge comprises removable filtering element with purge channel and sliding obturator which closes purge channel Download PDFInfo
- Publication number
- FR2816985A1 FR2816985A1 FR0014937A FR0014937A FR2816985A1 FR 2816985 A1 FR2816985 A1 FR 2816985A1 FR 0014937 A FR0014937 A FR 0014937A FR 0014937 A FR0014937 A FR 0014937A FR 2816985 A1 FR2816985 A1 FR 2816985A1
- Authority
- FR
- France
- Prior art keywords
- shutter
- purge channel
- purge
- base
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 25
- 238000010926 purge Methods 0.000 title claims abstract description 22
- 238000001914 filtration Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000000806 elastomer Substances 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/147—Bypass or safety valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/153—Anti-leakage or anti-return valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/16—Valves
- B01D2201/162—Valves with snap, latch or clip connecting means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
- F01M2001/105—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements
- F01M2001/1064—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements comprising drains for oil to the carter, e.g. to recover spilled oil during change of filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
<Desc/Clms Page number 1> <Desc / Clms Page number 1>
Filtre à liquide à purge automatique pour moteur à combustion interne. Automatic purge liquid filter for internal combustion engine.
La présente invention est relative aux filtres à liquide à purge automatique pour moteurs à combustion interne. The present invention relates to automatic purge liquid filters for internal combustion engines.
Plus particulièrement, l'invention concerne un filtre à liquide pour moteur à combustion interne, comportant : une embase qui présente un axe central, un couvercle adapté pour être fixé sur l'embase en délimitant avec celle-ci une chambre de filtration fermée, une entrée de liquide communiquant avec la chambre de filtration,
une sortie de liquide communiquant avec la chambre de filtration, un élément filtrant amovible interposé de façon étanche entre l'entrée et la sortie de liquide, cet élément filtrant étant centré sur l'axe central de l'embase, un canal de purge qui est ménagé dans l'embase et qui s'étend vers le bas selon l'axe central,
- et un obturateur porté par un support qui porte lui-même l'insert filtrant et qui est monté coulissant à mouvement perdu sous le couvercle, cet obturateur étant disposé sur l'axe central de l'embase et étant adapté pour fermer le canal de purge lorsque le couvercle est fermé et pour ouvrir le canal de purge lorsque le couvercle est ouvert. More particularly, the invention relates to a liquid filter for an internal combustion engine, comprising: a base which has a central axis, a cover adapted to be fixed to the base by delimiting with it a closed filtration chamber, a liquid inlet communicating with the filtration chamber,
a liquid outlet communicating with the filtration chamber, a removable filter element interposed in a sealed manner between the inlet and the outlet of the liquid, this filter element being centered on the central axis of the base, a purge channel which is formed in the base and which extends downwards along the central axis,
- And a shutter carried by a support which itself carries the filter insert and which is slidably mounted with lost movement under the cover, this shutter being disposed on the central axis of the base and being adapted to close the channel of purge when the lid is closed and to open the purge channel when the lid is open.
Le document EP-A-0 653 234 décrit un filtre à liquide de ce type, dans lequel l'obturateur est constitué par l'extrémité inférieure dudit support, laquelle s'emboîte avec étanchéité radiale dans le canal de purge en position fermée du couvercle. L'étanchéité radiale entre l'obturateur et le canal de purge est obtenue par un joint Document EP-A-0 653 234 describes a liquid filter of this type, in which the shutter is constituted by the lower end of said support, which fits with radial sealing in the purge channel in the closed position of the cover. . The radial seal between the shutter and the purge channel is obtained by a seal
<Desc/Clms Page number 2><Desc / Clms Page number 2>
en élastomère rapporté autour de l'obturateur, de sorte qu'il existe un certain risque que ce joint rapporté soit enlevé, volontairement ou non, lors des opérations de remplacement de l'insert filtrant, après quoi la chambre de filtration fuit vers le canal de purge. made of elastomer attached around the obturator, so that there is a certain risk that this attached seal is removed, voluntarily or not, during the operations of replacing the filter insert, after which the filtration chamber leaks towards the channel purge.
La présente invention a notamment pour but de pallier cet inconvénient. The object of the present invention is in particular to overcome this drawback.
A cet effet, selon l'invention, un filtre à liquide du genre en question est caractérisé en ce que l'obturateur est un organe monobloc qui présente une portée annulaire convexe venant en contact selon une ligne annulaire avec un siège annulaire en entonnoir formé en partie supérieure du canal de purge, l'obturateur étant monté axialement coulissant sur le support et étant sollicité élastiquement vers le siège. To this end, according to the invention, a liquid filter of the kind in question is characterized in that the shutter is a one-piece member which has a convex annular bearing coming into contact along an annular line with an annular funnel seat formed in upper part of the purge channel, the shutter being mounted axially sliding on the support and being urged elastically towards the seat.
Grâce à ces dispositions, on évite l'emploi d'un joint en élastomère emboîté à l'extrémité de l'obturateur, puisque : le montage avec jeu et avec sollicitation élastique de l'obturateur par rapport au support, permet de garantir une force d'appui suffisante de l'obturateur contre son siège, pour avoir une bonne étanchéité, et les formes respectives de l'obturateur et de son siège favorisent cette étanchéité. Thanks to these provisions, the use of an elastomer gasket fitted at the end of the shutter is avoided, since: mounting with clearance and with elastic stress on the shutter relative to the support, guarantees a force sufficient support of the shutter against its seat, to have a good seal, and the respective shapes of the shutter and its seat promote this seal.
Par ailleurs, le siège en forme d'entonnoir qui forme l'extrémité supérieure du canal de purge garantit non seulement un bon contact avec la portée convexe de l'obturateur, mais également un bon écoulement du liquide vers le canal de purge lors de l'ouverture du couvercle. In addition, the funnel-shaped seat which forms the upper end of the purge channel guarantees not only good contact with the convex surface of the shutter, but also good flow of the liquid towards the purge channel during the opening of the cover.
Dans des modes de réalisation préférés de l'invention, on peut éventuellement avoir recours en outre à l'une et/ou à l'autre des dispositions suivantes : l'obturateur est prolongé vers le haut par des bras axiaux qui coulissent dans un rebord annulaire intérieur solidaire du support, ces bras axiaux se In preferred embodiments of the invention, it is optionally possible to have recourse in addition to one and / or the other of the following arrangements: the shutter is extended upwards by axial arms which slide in a flange inner annular secured to the support, these axial arms are
<Desc/Clms Page number 3><Desc / Clms Page number 3>
terminant par des crochets qui font saillie radialement vers l'extérieur et qui sont adaptés pour retenir l'obturateur sur le support lorsque le couvercle est démonté de l'embase, un ressort de compression étant interposé entre ledit rebord intérieur et un épaulement appartenant à l'obturateur ; les crochets présentent des faces inférieures s'étendant en biais vers l'extérieur et vers le bas, ces faces inférieures étant adaptées pour venir en appui contre une face annulaire supérieure de forme complémentaire appartenant au rebord intérieur du support ; la portée annulaire de l'obturateur forme un tronc de sphère ; le siège de l'obturateur est tronconique ;
l'obturateur est moulé en matière plastique ; l'obturateur est revêtu d'une couche extérieure d'élastomère surmoulée. ending with hooks which project radially outward and which are adapted to retain the shutter on the support when the cover is removed from the base, a compression spring being interposed between said inner rim and a shoulder belonging to the shutter; the hooks have lower faces extending obliquely outwards and downwards, these lower faces being adapted to bear against an upper annular face of complementary shape belonging to the inner rim of the support; the annular bearing surface of the shutter forms a sphere trunk; the seat of the shutter is frustoconical;
the shutter is molded in plastic; the shutter is coated with an outer layer of overmolded elastomer.
D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description suivante d'une de ses formes de réalisation, donnée à titre d'exemple non limitatif, en regard des dessins joints. Other characteristics and advantages of the invention will appear during the following description of one of its embodiments, given by way of nonlimiting example, with reference to the accompanying drawings.
Sur les dessins : la figure 1 est une vue en coupe verticale d'un filtre à liquide selon une forme de réalisation de l'invention, en position d'utilisation, et la figure 2 est une vue du détail II de la figure 1. In the drawings: FIG. 1 is a view in vertical section of a liquid filter according to an embodiment of the invention, in the position of use, and FIG. 2 is a view of detail II of FIG. 1.
La figure 1 représente un filtre à liquide 1 pour moteur à combustion interne, qui peut constituer en particulier un filtre à huile. FIG. 1 represents a liquid filter 1 for an internal combustion engine, which can in particular constitute an oil filter.
Ce filtre à liquide comporte une embase 2 qui forme une cuve cylindrique de révolution centrée sur un axe Z sensiblement vertical, cette cuve comportant : une paroi latérale annulaire 3 dotée d'un filetage interne 4, This liquid filter comprises a base 2 which forms a cylindrical tank of revolution centered on a substantially vertical axis Z, this tank comprising: an annular side wall 3 provided with an internal thread 4,
<Desc/Clms Page number 4><Desc / Clms Page number 4>
et un fond 5 qui est prolongé vers le bas par un appendice tubulaire inférieur 6 délimitant intérieurement un conduit de liquide 7, et le fond 5 se prolongeant également vers le haut, à l'intérieur de la cuve 2, par un embout tubulaire 8 qui forme extrémité supérieure du conduit de liquide 7. and a bottom 5 which is extended downwards by a lower tubular appendage 6 internally delimiting a liquid conduit 7, and the bottom 5 also extending upwards, inside the tank 2, by a tubular end piece 8 which form upper end of the liquid pipe 7.
A l'extrémité supérieure ouverte de la paroi latérale 3 est vissé un couvercle 9 qui comporte un filetage 10 complémentaire du filetage 4 de la cuve. At the open upper end of the side wall 3 is screwed a cover 9 which has a thread 10 complementary to the thread 4 of the tank.
Lorsque le couvercle 9 et vissé sur l'embase 2, il délimite avec cette cuve une chambre de filtration 11 fermée, qui communique avec l'extérieur uniquement par l'intermédiaire : d'une entrée de liquide 12 qui débouche dans le fond 5 de la cuve, dans une position excentrée par rapport à l'axe Z, et du conduit de liquide 7 susmentionné, dont l'extrémité supérieure communique latéralement avec une sortie de liquide 14 et qui communique en partie inférieure avec un canal de purge 15. When the cover 9 and screwed onto the base 2, it defines with this tank a closed filtration chamber 11, which communicates with the outside only by means of: a liquid inlet 12 which opens into the bottom 5 of the tank, in an eccentric position with respect to the axis Z, and the aforementioned liquid conduit 7, the upper end of which communicates laterally with a liquid outlet 14 and which communicates in the lower part with a purge channel 15.
Par ailleurs, la chambre de filtration 11 contient un insert filtrant 16, réalisé à base de papier filtre ou autre, dont le flasque inférieur étanche 16a repose axialement avec étanchéité sur l'embout tubulaire 8 de façon que l'insert 16 soit interposé entre l'entrée 12 et la sortie 14 de liquide. Furthermore, the filtration chamber 11 contains a filter insert 16, made from filter paper or the like, the sealed lower flange 16a of which rests axially with sealing on the tubular end piece 8 so that the insert 16 is interposed between the 'inlet 12 and outlet 14 of liquid.
Par ailleurs, le flasque supérieur étanche 16b de l'insert filtrant 16 est emboîté en contact étanche autour d'un support tubulaire 17 en matière plastique qui est monté axialement coulissant à mouvement perdu sous le couvercle 9. Furthermore, the sealed upper flange 16b of the filter insert 16 is fitted in sealed contact around a tubular support 17 of plastic material which is mounted axially sliding with lost movement under the cover 9.
Par exemple, le support tubulaire 17 peut être solidarisé par emboîtement à force, soudure ou autre avec un pontet 18 qui peut appartenir par exemple à un clapet de by-pass 19 engagé dans un puits central 20 ménagé à For example, the tubular support 17 can be secured by force fitting, welding or the like with a trigger guard 18 which can belong, for example, to a bypass valve 19 engaged in a central well 20 formed at
<Desc/Clms Page number 5><Desc / Clms Page number 5>
l'intérieur du support 17, lequel puits central communique avec la face d'aval de l'insert filtrant par l'intermédiaire de trous 17a du support 17. Le pontet 18 est lui-même monté coulissant à mouvement perdu sous le couvercle au moyen de crochets 9a du couvercle qui sont clipsés sur ledit pontet, tandis qu'un ressort de compression 9b sollicite le pontet 18 et l'insert 16 vers le bas, en garantissant le contact étanche entre le flasque 16a de l'insert et l'embout 8 de la cuve. the interior of the support 17, which central well communicates with the downstream face of the filter insert through holes 17a of the support 17. The trigger guard 18 is itself mounted sliding with lost movement under the cover by means of hooks 9a of the cover which are clipped onto said bridge, while a compression spring 9b biases the bridge 18 and the insert 16 downwards, guaranteeing tight contact between the flange 16a of the insert and the end piece 8 of the tank.
Par ailleurs, le filtre comporte en outre un obturateur 21, avantageusement moulé en matière plastique (polyamide ou autres) et le cas échéant revêtu d'une couche externe d'élastomère surmoulée. Furthermore, the filter further comprises a shutter 21, advantageously molded in plastic material (polyamide or other) and if necessary coated with an outer layer of overmolded elastomer.
Cet obturateur 21 est monté coulissant à mouvement perdu à l'extrémité inférieure du support tubulaire 17 et est sollicité vers le bas par un ressort de compression 22 interposé entre, d'une part, un rebord annulaire intérieur 23 formé à l'extrémité inférieure du support tubulaire 17, et d'autre part, un épaulement annulaire 24 formé en partie supérieure du corps plein 25 de l'obturateur. This shutter 21 is slidably mounted with lost movement at the lower end of the tubular support 17 and is biased downwards by a compression spring 22 interposed between, on the one hand, an inner annular flange 23 formed at the lower end of the tubular support 17, and on the other hand, an annular shoulder 24 formed in the upper part of the solid body 25 of the shutter.
Ainsi, pendant le fonctionnement normal du filtre, on garantit un contact étanche entre : d'une part, une portée annulaire convexe, de préférence en forme de tronc de sphère 26 formé à l'extrémité inférieure du corps 22, et d'autre part, un siège annulaire 27 de forme conique qui est formée à l'intérieur du conduit 6 et qui est en contact avec la portée 26 selon une ligne circulaire. Thus, during normal operation of the filter, a tight contact is guaranteed between: on the one hand, a convex annular surface, preferably in the form of a sphere trunk 26 formed at the lower end of the body 22, and on the other hand , an annular seat 27 of conical shape which is formed inside the duct 6 and which is in contact with the bearing surface 26 along a circular line.
Avantageusement, le corps plein 25 de l'obturateur se prolonge vers le haut par des pattes axiales 28 qui présentent à leur extrémité libre des crochets 29 faisant saillie radialement vers l'extérieur. Advantageously, the solid body 25 of the shutter is extended upward by axial tabs 28 which have hooks 29 projecting radially outward at their free end.
Ces crochets 29 présentent une face inférieure 30 s'étendant en biais vers l'extérieur et vers le bas. La These hooks 29 have a lower face 30 extending obliquely outward and downward. The
<Desc/Clms Page number 6><Desc / Clms Page number 6>
face supérieure 31 du rebord annulaire 23 susmentionné présente par ailleurs une forme tronconique complémentaire des faces inférieures 30 des crochets 29, ce qui garantit que l'obturateur 21 reste bien parallèle à l'axe Z lorsque le couvercle 9 est retiré de l'embase 2, puisque l'obturateur 21 ouvre alors le canal de purge 15 et est repoussé vers le bas par le ressort 22 jusqu'à ce que les crochets 29 viennent buter contre le rebord intérieur 23. upper face 31 of the abovementioned annular rim 23 moreover has a frustoconical shape complementary to the lower faces 30 of the hooks 29, which guarantees that the shutter 21 remains indeed parallel to the axis Z when the cover 9 is removed from the base 2 , since the shutter 21 then opens the purge channel 15 and is pushed down by the spring 22 until the hooks 29 abut against the internal rim 23.
Claims (7)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0014937A FR2816985A1 (en) | 2000-11-20 | 2000-11-20 | I.C. engine liquid filter with automatic purge comprises removable filtering element with purge channel and sliding obturator which closes purge channel |
| DE10156888.6A DE10156888B4 (en) | 2000-11-20 | 2001-11-20 | Liquid filter with automatic flushing for an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0014937A FR2816985A1 (en) | 2000-11-20 | 2000-11-20 | I.C. engine liquid filter with automatic purge comprises removable filtering element with purge channel and sliding obturator which closes purge channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2816985A1 true FR2816985A1 (en) | 2002-05-24 |
Family
ID=8856652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0014937A Withdrawn FR2816985A1 (en) | 2000-11-20 | 2000-11-20 | I.C. engine liquid filter with automatic purge comprises removable filtering element with purge channel and sliding obturator which closes purge channel |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE10156888B4 (en) |
| FR (1) | FR2816985A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10333398A1 (en) * | 2003-07-16 | 2005-02-03 | Joma-Polytec Kunststofftechnik Gmbh | Oil filter arrangement |
| DE102006034485A1 (en) * | 2006-07-21 | 2008-01-24 | Joma-Polytec Kunststofftechnik Gmbh | Oil filter assembly comprises a receiving chamber closed by a cover element with a spring-loaded support tube that is fixed in the receiving chamber for housing a radial filter element, which flows throughable by oil in a radial direction |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3344568A1 (en) * | 1983-12-09 | 1985-06-20 | Daimler-Benz Ag, 7000 Stuttgart | Filter with a filter housing and a filter element for cleaning lubricating oil of an internal combustion engine |
| US5049269A (en) * | 1989-06-08 | 1991-09-17 | Sunstrand Corporation | Filter assembly with spring loaded valve |
| EP0612549A2 (en) * | 1993-02-09 | 1994-08-31 | Knecht Filterwerke Gmbh | Oil filter for purifying lubricating oil |
| DE4408888A1 (en) * | 1993-03-19 | 1994-09-22 | Hengst Walter Gmbh & Co Kg | Filter for an internal combustion engine |
| EP0653234A1 (en) | 1991-03-28 | 1995-05-17 | Knecht Filterwerke Gmbh | Liquid filter |
| US5538626A (en) * | 1994-07-13 | 1996-07-23 | Ing, Walter Hengst Gmbh & Co. Kg | Liquid filter |
| US5770054A (en) * | 1995-03-16 | 1998-06-23 | Firma Ing. Walter Hengst Gmbh & Co. Kg | Fluid filter with filter bypass valve and sealing surface on filter element side |
-
2000
- 2000-11-20 FR FR0014937A patent/FR2816985A1/en not_active Withdrawn
-
2001
- 2001-11-20 DE DE10156888.6A patent/DE10156888B4/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3344568A1 (en) * | 1983-12-09 | 1985-06-20 | Daimler-Benz Ag, 7000 Stuttgart | Filter with a filter housing and a filter element for cleaning lubricating oil of an internal combustion engine |
| US5049269A (en) * | 1989-06-08 | 1991-09-17 | Sunstrand Corporation | Filter assembly with spring loaded valve |
| EP0653234A1 (en) | 1991-03-28 | 1995-05-17 | Knecht Filterwerke Gmbh | Liquid filter |
| EP0612549A2 (en) * | 1993-02-09 | 1994-08-31 | Knecht Filterwerke Gmbh | Oil filter for purifying lubricating oil |
| DE4408888A1 (en) * | 1993-03-19 | 1994-09-22 | Hengst Walter Gmbh & Co Kg | Filter for an internal combustion engine |
| US5538626A (en) * | 1994-07-13 | 1996-07-23 | Ing, Walter Hengst Gmbh & Co. Kg | Liquid filter |
| US5770054A (en) * | 1995-03-16 | 1998-06-23 | Firma Ing. Walter Hengst Gmbh & Co. Kg | Fluid filter with filter bypass valve and sealing surface on filter element side |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10156888A1 (en) | 2002-08-29 |
| DE10156888B4 (en) | 2017-10-26 |
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