DE102011009925A1 - Replacement filter and filter head of a filter - Google Patents

Abstract

An exchangeable filter (10) of a filter for fluids, in particular oil or fuel, an internal combustion engine, in particular a motor vehicle, with a filter housing (18), which has a filter bowl (14) and a filter cover (16), is described. The filter cover (16) has a central cover fluid passage (24) and at least one eccentric cover fluid passage (22). The central cover fluid passage (24) is designed such that a connection piece of a filter head of the filter can be introduced into it by means of a rotary and / or plug connection. A filter element (28) is arranged in the filter housing (18) and separates the eccentric cover fluid passage (22) from the central cover fluid passage (24). The filter element (28) has a central element fluid passage (38) which is coaxial with the central cover fluid passage (24). A plug (56), the maximum outer diameter of which is smaller than the diameter of the central cover fluid passage (24), is arranged on the filter element (28) to close the central element fluid passage (38) and the central cover fluid passage (24) and removable through the central cover fluid passage (34).

Description

Technical area

The invention relates to an exchangeable filter of a filter for fluids, in particular oil or fuel, of an internal combustion engine, in particular of a motor vehicle, with a filter housing, which has a filter pot and a filter cover, and the filter cover has a central cover fluid passage and at least one eccentric cover fluid passage, and the central lid fluid passage is configured such that a spigot of a filter head of the filter can be inserted therein by means of a rotary and / or plug connection, and in the filter housing a filter element is arranged, which the eccentric lid fluid passage from the central lid Fluid passage separates, and the filter element has a central element fluid passage which is coaxial with the central lid fluid passage, and on the filter element, an annular seal is arranged, which is coaxial with the element fluid passage.

The invention further relates to a filter head of a filter for fluids, in particular oil or fuel, an internal combustion engine, in particular a motor vehicle, with a connecting piece with an external thread for screwing into an internal thread of a central cover fluid passage of an exchangeable filter, wherein the connecting piece in the region of its free end outside the external thread has a cylindrical sealing area for a ring seal of the replaceable filter.

State of the art

A known from the market replaceable filter for engine oil of an internal combustion engine has a filter housing in which a coaxial filter element is arranged. In a filter cover of the filter housing a central oil outlet for the engine oil is arranged. The oil outlet has an internal thread with which the replaceable filter can be screwed onto a corresponding screw-on base of a filter head in the oil circuit of the internal combustion engine. Radially outside the oil outlet, a large number of oil inlets are arranged eccentrically in the filter cover. The filter element separates the oil inlets from the oil outlet. The engine oil to be cleaned flows via the oil inlets into an inlet space in the filter housing, which surrounds the filter element radially on the outside. The engine oil flows through the filter element radially from outside to inside in an interior of the filter element. From the interior of the filter element, the filtered engine oil on the clean side flows out of the filter housing through the oil outlet. To an end plate of the filter element, an annular seal is fixed, which is arranged coaxially with the oil outlet and the frontal opening of the interior of the filter element. The ring seal seals against a circumferential sealing surface of the mounting base. With the ring seal the clean side of the filter element inside the filter housing is separated from the raw side.

The invention has for its object to make a replaceable filter and a filter head of a filter of the type mentioned, in which a protection against contamination of an interior, in particular the clean side of the filter element after its manufacture, when installed in the filter housing, during transport, be improved during storage and mounting on the filter head. Furthermore, the separation of the clean side of the raw side of the filter element should be improved.

Disclosure of the invention

This object is achieved according to the invention in that a closure stopper, the maximum outer diameter of which is smaller than the diameter of the central lid fluid passage, for closing the central element fluid passage and the central lid fluid passage is arranged on the filter element and removable through the central lid fluid passage is.

According to the invention, the element fluid passage is simply preferably already sealed with a sealing plug immediately after the manufacture of the filter element. In this way prevents the installation of the filter element in the filter housing any metal chips or plastic chips or other types of contamination from the filter housing can get into the interior of the filter element. It is not necessary to lavishly clean the housing parts, in particular the thread of the central cover passage, as is the case with changeover filters known from the prior art. The sealing plug can remain in the element fluid passage, in particular for storage and transport purposes, until the replaceable filter is to be mounted on the filter head. By using a sealing plug, it is also not necessary to completely shrink the replaceable filter for storage or transport purposes, in particular in foil, or to provide it with a cover which extends over the entire cover side of the replaceable filter, as in the case of interchangeable filters known from the prior art the case is to prevent dirt entry. In the replaceable filter according to the invention, only the central element fluid passage is closed by the lid fluid passage with the sealing plug. To install the replaceable filter on the filter head of the plug is pulled out through the central lid fluid passage, so that access to the interior of the filter element is released. The replaceable filter can then be put on the connecting piece. Advantageously, the cover fluid passage an internal thread and the connecting piece on an external thread, so that the replaceable filter can be screwed easily and again detachably on the connection piece.

In an advantageous embodiment, the sealing plug can be arranged in a seal holder of a ring seal for sealing against the connecting piece for the purpose of separating the clean side of the filter element from the raw side, which is fixed coaxially to the element fluid passage on the filter element. The sealing plug can be stably held on the filter element by means of the seal holder. It is possible to insert the sealing plug in the already mounted ring seal, which then seals the element fluid passage against the sealing plug. In the event that the ring seal at a later date, in particular immediately before mounting the replaceable filter is mounted on the filter head, the plug can also be inserted into the empty seal holder. The filter element can be manufactured, stored and transported separately from the filter housing with the sealing plug and with the optionally mounted ring seal. The seal holder ensures a secure fit and prevents the ring seal from being lost or displaced when transporting the filter element or when installing the replaceable filter. In the fully assembled replaceable filter, a peripheral sealing surface of the connecting piece and the ring seal abut each other. The ring seal forms a reliable seal of the clean side against the raw side. In the event that the central lid fluid passage and the element fluid passage are fluid outlets located on the clean side of the filter element, the ring seal seals immediately on the clean side. If the replaceable filter is connected to the connecting piece with a screw connection, the screw thread is shifted from the clean side to the raw side of the filter element by using the ring seal, without the design principle of the replaceable filter having to be changed. The interior of the filter element is closed to the raw side. There can be no uncleaned fluid, which can adhere in particular to the filter head, get into the interior of the filter element. The ring seal prevents fluid, which can leak from the raw side via the threads between the connection piece and the filter cover, into the interior of the filter element.

Advantageously, the seal holder can protrude into an interior of the filter element. The ring seal can thus always be arranged outside protected in the interior of the filter element without further measures, especially during manufacture, storage and transport.

In an advantageous embodiment, the filter element may have an end plate, on which the closure stopper is arranged, in particular the seal holder is fastened. Advantageously, the seal holder is integrally connected to the end plate, so that the seal holder can be made in one operation with the end plate. In this way, the number of components and the production cost is reduced. The ring seal may be mounted to the seal retainer after fabrication of the endplate and later attached to the filter element together with the endplate.

In a further advantageous embodiment, the seal holder may have a rotationally symmetrical wall coaxial with the element fluid passage, and the ring seal may be arranged in the region of the free edge of the seal holder on its side facing away from the filter cover. In this way, the ring seal with respect to the end face of the filter element can be easily offset axially inwardly. The coaxial wall also serves as a guide and centering aid for the sealing plug and the connecting piece. In a limited by the coaxial wall space can be plugged easily and stably a sealing plug.

Advantageously, the wall may be bent, in particular stepped, relative to the central lid fluid passage radially inwardly and axially to the filter element, such that the wall defines an annulus between the filter cover and the ring seal, and the ring seal may be in a section be arranged of the seal holder with the smallest diameter. In particular, unpurified fluid, which is stripped off when connecting the replaceable filter with the ring seal from the sealing surface of the connecting piece, can be collected in the annulus. Likewise, in particular uncleaned fluid, which can seep through any threads of the connecting piece from the outside of the filter cover, be collected in the annulus.

Advantageously, the inner diameter of the seal holder, in particular the ring seal, be smaller than the inner diameter of the central cover fluid passage, such that the closure plug whose outer diameter is selected so that it can be plugged into the seal holder, in particular the ring seal, through can be moved through the central lid fluid passage. The closure plug may be inserted into the element fluid passageway after manufacture of the filter element it remains in the filter housing during installation of the replaceable filter element. Prior to mounting to the filter head, the stopper can simply be pulled out through the central lid fluid passage. The interior of the filter element is protected in this way from a very early assembly phase to the cultivation of the replaceable filter to the filter head from contamination and rohseitigem fluid.

The object is further achieved by the filter head, characterized in that a largest outer diameter of the sealing region is smaller than a core diameter of the external thread. The connection piece is therefore stepped. The ring seal of the replaceable filter element can then be designed so that it has a significantly smaller inner diameter than the thread of the central cover fluid passage. Characterized an annular space is limited by the radially outer peripheral surface of the connecting piece and the seal holder, which serves as a compensation chamber for fluid during assembly of the replaceable filter to the filter head.

Brief description of the drawings

Further advantages, features and details of the invention will become apparent from the following description in which an embodiment of the invention with reference to the drawings is explained in more detail. The person skilled in the art will expediently also individually consider the features disclosed in the drawing, the description and the claims in combination and combine these into meaningful further combinations. Show it:

1 schematically a longitudinal section of an interchangeable filter, which is mounted on a filter head of an oil circuit of an internal combustion engine;

2 schematically the replaceable filter 1 ;

3 schematically the replaceable filter from the 1 and 2 in which a lid outlet and an element outlet are closed with a stopper.

In the figures, the same components are provided with the same reference numerals.

Embodiment (s) of the invention

In 1 is an exchangeable filter 10 shown for engine oil in the longitudinal section. The replaceable filter 10 is on a filter head 12 screwed a filter of a not interesting here engine oil line of an internal combustion engine. The replaceable filter 10 has a pot 14 and a lid 16 , The pot 14 forms together with the lid 16 a housing 18 , The pot 14 is via a liquid-tight flared connection with the lid 16 connected. In the area of the flare connection, there is a seal in a bead 20 arranged.

In the lid 16 are several inlet openings 21 distributed, through which the engine oil to be cleaned in the replaceable filter 10 can flow in. Furthermore, the lid has 16 via a centrally arranged lid outlet 24 which is an internal thread 25 for attaching the replaceable filter 10 to an external thread 26a a cylindrical connection piece 26 having. The lid outlet 24 and the connecting piece 26 are coaxial with an imaginary screw-in axis 42 of the replaceable filter 10 ,

The connecting piece 26 is part of the filter head 12 , The radially outer peripheral side of the connecting piece 26 is graded. On the filter head 12 facing side of the connecting piece 26 is the external thread 26a arranged. In the area of its free end is the connecting piece 26 as a sealing section 26b educated. The outer diameter of the seal section 26b is significantly smaller than the core diameter of the external thread 26a , Inside the connection piece 26 there is an outlet channel 26c , which is connected to the engine oil pipe and to the free end face of the connection piece 26 is open.

Inside the case 18 is a filter element 28 arranged. The filter element 28 separates the inlet openings 22 sealing from the lid outlet 24 , The filter element 28 has a filter medium for this purpose 30 , which is zigzag folded and star-shaped closed. The filter medium 30 limits a radially inner interior 31 of the filter element 28 , which is the clean side of the filter element 28 with forms.

At the ends of the filter medium 30 are a bottom end disk 32 and a connecting end disk 34 made of plastic. The bottom end disk 32 closes the interior 31 on the bottom of the case 18 facing end face of the filter element 28 , The bottom end disk 32 is via support elements 36 against a pot bottom of the pot 14 supported.

The connecting end disk 34 is essentially designed as an annular disc whose radially inner portion is stepped several times. A central opening of the connecting end disk 34 forms one to the lid outlet 24 coaxial element outlet 38 through which the sealing section 26b of the connecting piece 26 leads through. Radially from outside to inside is the connecting end disk 34 first to a cylindrical support collar 40 shaped, which is axially to the screw-in 42 from inner space 31 extends away. The support collar 40 surrounds the lid outlet 24 and supports the filter element 28 against the underside of the lid 16 from.

Radially inside the support collar 40 extends the Anschlussendscheibe 34 for forming a seal holder 50 a piece radially to the screw 42 inward to axially into the interior following a 90 ° bend in a generally cylindrical shape 31 to extend. The free end of the cylindrical portion is bent by 90 ° radially inwardly and forms a support portion 47 for a ring seal 48 in the area of the support section 47 had seal holder 50 its smallest diameter. The area of the connection end disk 34 from the radially inner side of the support collar 40 to the rest section 47 forms a stepped, to Einschraubachse 42 coaxial wall 44 , The wall 44 limits an annulus 46 between the lid 16 and the ring seal 48 ,

The ring seal 48 is between the support section 47 and a support ring disk 52 held. The support ring disk 52 and the overlay section 47 form a kind of sealing groove, in which the ring seal 48 is held displaceable in the axial direction.

The ring seal 48 seals the connection end disk 34 in the area of the element outlet 38 against the sealing portion 26b of the connecting piece 26 from. In this way, the clean-side interior 31 of the filter element 28 from a raw side 54 separated. The raw side 54 is through the the filter medium 30 radially surrounding area and between the connection-side end face of the filter element 28 and the lid 16 with formed space.

To the interior 31 of the filter element 28 when installed in the housing 18 and to protect against contamination during storage and / or transport is a sealing plug 56 provided in 3 is shown. The sealing plug 56 closes the lid outlet 24 and the element outlet 38 , At the sealing plug 56 it is a stepped cylinder with a lid closure section 56a and an element closure section 56b , The outer diameter of the lid closure portion 56a is slightly smaller than the inside diameter of the internal thread 25 the lid outlet 24 , The outer diameter of the element closure portion 56b corresponds approximately to the inner diameter of the ring seal 48 so that the ring seal 48 sealing on the element closure section 56b rests and no dirt or oil in the interior 31 can get.

For the production of the replaceable filter 10 first the filter medium 30 folded in a manner not of interest here and circumferentially closed. The connecting end disk 34 comes with the seal holder 50 shaped. The ring seal 48 will be in the seal holder 50 arranged. The bottom end disk 32 and the connecting end disk 34 be on the appropriate end faces of the filter medium 30 attached.

The sealing plug 56 becomes the closure of the element outlet 38 in the seal holder 50 with the ring seal 48 stuck, so he against the ring seal 48 the interior 31 seals. Alternatively, the sealing plug 56 also in the seal holder 50 be plugged before the Anschlussendscheibe 34 at the front of the filter medium 30 is attached. It is also possible the ring seal 48 to install at a later time after the stopper 56 was removed again, for example, immediately before mounting on the filter head 12 , In this case, the stopper can 56 directly into the seal holder 50 be plugged in. The sealing plug 56 can be made of an elastic material, so that the sealing effect when closing the element outlet 38 is improved.

The filter element 28 comes with the bottom end disk 32 ahead in the filter pot 14 plugged. The lid 16 gets on the pot 14 placed, wherein the lid closure portion 56a of the sealing plug 56 through the lid outlet 24 is passed. The sealing plug 56 also closes the lid outlet 24 ,

For mounting the replaceable filter 10 at the filter head 12 becomes the stopper 56 through the lid outlet 24 pulled out, leaving lid outlet 24 and element outlet 38 are freely accessible. The replaceable filter 10 will with the lid 16 ahead on the connecting piece 26 plugged. The sealing section 26b acts as a guide and centering aid for the replaceable filter 10 , The sealing section 26b slides on the ring seal 48 along, with the interior 31 against the raw side 54 is sealed. It can not pollute engine oil, which is in the area of the connecting piece 26 can still be found in the interior 31 of the filter element 28 reach. The annulus 46 acts as a plenum, in the polluted engine oil that passes through the ring seal 48 from the sealing section 26b is stripped, caught.

Once the external thread 26a on the internal thread 25 the lid outlet 24 is applied, the replaceable filter 10 on the connecting piece 26 screwed.

When operating the replaceable filter 10 prevents the ring seal 48 that dirty engine oil from the raw side 54 about the threads between the internal thread 25 the lid outlet 24 and the external thread 26a of the connecting piece 26 in the interior 31 can get. Raw engine oil, which seeps through the threads, becomes in the annulus 46 collected.

In all embodiments of a replaceable filter described above 10 Among others, the following modifications are possible:
The invention is not limited to internal combustion engines of motor vehicles. Rather, it can also be used in other types of internal combustion engines, such as industrial engines. The invention can also be used for other types of liquid fluids, such as fuel or water, instead of filtering motor oil.

Instead of the zigzag folded and star-shaped closed filter medium 30 may also be provided a different type of filter medium, which has a preferably coaxial interior. In principle, it is also possible to provide a filter medium which is angular in its outer contour.

The bottom end disk 32 and / or the Anschlussendscheibe 34 can be made of a different material, such as metal, instead of plastic.

Instead of the screw connection with the internal thread 25 and the external thread 26a may also be a different type of rotary and / or plug connection, such as a bayonet-type connection, for attaching the Wechseifilters 10 at the filter head 12 be provided.

Claims (8)

Exchange filter ( 10 ) of a filter for fluids, in particular oil or fuel, an internal combustion engine, in particular of a motor vehicle, with a filter housing ( 18 ), which has a filter pot ( 14 ) and a filter cover ( 16 ), and the filter cover ( 16 ) a central lid fluid passage ( 24 ) and at least one eccentric lid fluid passage ( 22 ), and the central lid fluid passage ( 24 ) is designed so that in him a connecting piece ( 26 ) of a filter head ( 12 ) of the filter can be introduced by means of a rotary and / or plug connection, and in the filter housing ( 18 ) a filter element ( 28 ) is arranged, which the eccentric lid fluid passage ( 22 ) from the central lid fluid passage (FIG. 24 ) and the filter element ( 28 ) a central element fluid passage ( 38 ) leading to the central lid fluid passage ( 24 ) is coaxial, characterized in that a sealing plug ( 56 ) whose maximum outer diameter is smaller than the diameter of the central lid fluid passage ( 24 ), for closing the central element fluid passage ( 38 ) and the central lid fluid passage ( 24 ) on the filter element ( 28 ) and through the central lid fluid passage ( 34 ) is removable. An exchangeable filter according to claim 1, characterized in that the sealing plug ( 56 ) in a seal holder ( 50 ) a ring seal ( 48 ) for sealing against the connecting piece ( 26 ) for the purpose of separating the clean side ( 31 ) of the filter element ( 28 ) from the raw side ( 54 ) arranged coaxially with the element fluid passage ( 38 ) on the filter element ( 28 ) is attached. Exchange filter according to claim 2, characterized in that the seal holder ( 50 ) in an interior ( 31 ) of the filter element ( 28 protrudes. Replaceable filter according to one of the preceding claims, characterized in that the filter element ( 28 ) an end plate ( 34 ), on which the sealing plug ( 56 ), in particular the seal holder ( 50 ) is attached or integrated into this is. An exchangeable filter according to claim 2 or 3, characterized in that the seal holder ( 50 ) a rotationally symmetrical, to element fluid passage ( 38 ) coaxial wall ( 44 ) and the ring seal ( 48 ) in the region of the free edge of the seal holder ( 50 ) on whose the filter cover ( 16 ) facing away from the side. An exchangeable filter according to claim 5, characterized in that the wall ( 44 ) with respect to the central lid fluid passage ( 24 ) radially inwardly and axially of the filter element ( 28 ) in its interior ( 31 ), in particular stepped, is, so that the wall ( 44 ) an annulus ( 46 ) between the filter cover ( 16 ) and the ring seal ( 48 ) with limited and the ring seal ( 48 ) in a portion of the seal holder ( 50 ) is arranged with the smallest diameter. Exchange filter according to one of claims 2 to 6, characterized in that the inner diameter of the seal holder ( 50 ), in particular the ring seal ( 48 ), is smaller than the inner diameter of the central lid fluid passage ( 24 ), such that the sealing plug ( 56 ), whose outer diameter is selected so that it sealingly into the seal holder ( 50 ), in particular the ring seal ( 48 ) can be inserted through the central lid fluid passage ( 24 ) can be moved through. Filter head ( 12 ) of a filter for fluids, in particular oil or fuel, one Internal combustion engine, in particular of a motor vehicle, with a connecting piece ( 26 ) with an external thread ( 26a ) for screwing into an internal thread ( 25 ) of a central lid fluid passage ( 24 ) of an exchangeable filter ( 10 ) according to one of the preceding claims, wherein the connecting piece ( 26 ) in the region of its free end outside the external thread ( 26a ) a cylindrical sealing area ( 26b ) for a ring seal ( 48 ) of the replaceable filter ( 10 ), characterized in that a largest outer diameter of the sealing region ( 26b ) is smaller than a core diameter of the external thread ( 26a ).

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