DE102012000876C5 - Liquid filter and filter element of a liquid filter - Google Patents

Abstract

Liquid filter, in particular fuel filter or oil filter (10), an internal combustion engine, in particular of a motor vehicle, with a filter housing (12, 20) which is connected to a liquid line system, the at least one feed line (14) for liquid to be filtered and at least one discharge line (16) for filtered liquid and which has a housing pot (20) which has a mounting opening (48), on the side of which the housing pot (20) is connected by means of a housing-cover connection (24) to a housing cover (12) which is fixed is connected to the liquid line system, the housing-cover connection (24) being able to be locked and unlocked about an imaginary mounting axis (30) by means of a housing rotation movement of the housing pot (20) relative to the housing cover (12), and with a filter element ( 54) which is arranged interchangeably in the housing pot (20) so that it disconnects the at least one supply line (14) from the at least one a discharge line (16) separates, which can be removed from the housing pot (20) or inserted into the housing pot (20) through the mounting opening (48) axially to the mounting axis (30) in the housing pot (20) and the filter element ( 54) can be connected to the housing cover (12) by means of an element-cover connection (84), which can be locked and unlocked, and the filter element (54) can be connected to the housing pot (20) by means of an element-housing connection (70) ), which can be connected and separated by means of an axial movement of the filter element (54) relative to the housing pot (20) with respect to the mounting axis (30), characterized in that the element-cover connection (84) by means of an element rotary movement of the Filter element (54) can be locked or unlocked relative to the housing pot (20) around the mounting axis (30), a closing direction (90) of the housing rotary movement for locking the housing-cover connection (24) of a lock The direction of rotation of the element for locking the element-cover connection (84) is opposite and a maximum torque that can be transmitted with the element-housing connection (70) is greater than that for locking and unlocking the element-cover connection (84). Required torque, at least one cover-side connecting part (114) of the element-cover connection (84) being arranged on an adapter element (94) which is detachably attached to the housing cover (12).

Description

Technical area

The invention relates to a liquid filter according to the preamble of patent claim 1.

The invention further relates to a filter element device according to the preamble of patent claim 9.

State of the art

From the DE 10 2007 062 100 A1 is a liquid filter, in particular an oil filter for cleaning lubricating oil, in particular for internal combustion engines of motor vehicles known. The liquid filter comprises a receiving space for receiving an annular filter element. The filter element has two axial end disks. The liquid filter further comprises a lid, which is fastened to a housing for closing the receiving space. In the housing, a raw-side inlet, a clean-side outlet, a first additional opening are formed. In the lid, a second additional opening is formed. At the first end plate of the filter element, a first closure for closing the first additional opening is formed. At the second end disk of the filter element, a second closure for closing the second additional opening is formed. The cover can be screwed onto the housing. Between the first end plate and the housing results from the interaction of the first closure and the first additional opening an axial plug connection. Analogously, an axial plug connection results between the cover and the second end disk as a result of the interaction of the second additional opening with the second closure. In order to separate the filter element from the housing, first the cover must be removed.

From the U.S. Patent 4,678,572 For example, a vented cover assembly for a liquid container having a mounting ring, a filter and a lid is known. The filter housing of the filter is connectable via a first bayonet connection with the mounting ring in the wall of the liquid container. About another bayonet connection, the lid is detachably connectable to the filter housing. The lid can only be placed if there is a filter element in the filter housing.

In the disclosure WO 2004/091750 A1 a filter assembly with a filter housing, a filter element and a connecting element is disclosed, wherein a removable cover of the filter housing via the connecting element with the filter element is connectable. The connecting element is configured such that removal of the cover, in particular by rotation, leads to a rotation and / or axial displacement of the filter element relative to the remaining filter housing.

The invention has for its object to provide a liquid filter and a filter element device of the type mentioned, which allow both a low-vibration arrangement of a filter element and a resource-saving filter element change.

Disclosure of the invention

This object is achieved by a liquid filter according to claim 1 and a filter element device according to claim 9.

According to the invention, the element-housing connection and the element-cover connection are coordinated so that during a rotational movement of the housing pot relative to the housing cover, to open or close the local connection, transmit this rotational movement by means of the element-housing connection to the filter element becomes. Thus, the filter element can be rotated together with the housing pot relative to the housing cover. Since the closing direction of the case-lid connection corresponds to the opening direction of the element-lid connection, when the case-lid connection is locked, the element-lid connection can automatically be unlocked, if it was previously locked. When unlocking the housing-cover connection, conversely, automatically the element-cover connection can be locked. Thus, the element-lid connection can be actuated without the housing pot must be completely separated from the housing cover. The closing direction of the housing-cover connection may preferably correspond to a closing direction of a screw connection with common right-hand threads. However, the closing direction of the housing-cover connection can also correspond to a closing direction of a screw connection with left-hand threads. For installation of the filter element, the filter element can be connected to the housing cover separated housing cover first by means of the element-cover connection to the housing cover. Subsequently, the housing pot can be mounted, automatically when unlocking the housing-lid connection, the element-lid connection is unlocked again. This has the advantage that the element-lid connection is mechanically relieved at the ready liquid filter. In this way, a transmission of operational vibrations between the housing cover and the filter element is reduced. Upon rotation of the housing pot in the opening direction for separating the housing pot from the housing cover is a corresponding Transmit torque by means of the element-housing connection to the filter element and the element-lid connection automatically locked. The filter element is now held back to the housing cover. Thereafter, the housing pot can be removed from the housing cover, without the filter element drops from the housing cover. This is particularly advantageous in a suspended mounting in which the housing pot hangs down on the housing cover, advantage. A suspended mounting has the advantage that when separating the housing pot from the housing cover about liquid contained in the housing pot is held therein and can not escape into the environment. A vertical mounting of the element has the advantage that emptying the system is easier to implement. Advantageously, the filter cover may be a filter head, which may be permanently connected to the liquid line system, in particular to the internal combustion engine or to a frame of the internal combustion engine. Furthermore, the housing-element connection may advantageously be located on a side of the filter element which is opposite the housing cover, viewed axially with respect to the mounting axis. In this way, the holding functions between the housing pot and the housing cover, the filter element and the housing cover and the filter element and the housing pot can be separated from each other. This can improve the stability of the compounds. Furthermore, the filter element can thus be held on axially opposite sides, so that its positioning in the housing pot can be improved. Advantageously, the housing pot can be attached hanging from the bottom of the housing cover. Advantageously, the filter element may be a round filter element. A round filter element can be easily rotated with a rotary / plug movement around the mounting axis and thus connected to the housing cover and / or the housing pot. The filter element can advantageously have a coaxial to the mounting axis, circumferentially closed, star-shaped folded filter medium. Advantageously, the filter medium at its end faces in each case an end body, in particular an end plate having. With the end bodies, the front sides of the filter medium can be sealed. Advantageously, the filter element may have a support tube coaxial with the mounting axis. With the support tube, the filter medium can be supported. Advantageously, one of the end bodies may be connected to a corresponding element-side connection part of the element-cover connection, the other end body may be connected to an element-side connection part of the housing-element connection. The support body can connect the two end bodies together. Thus, the element-side connecting parts can be rotated together about the mounting axis. In this way, a torque acting upon opening or closing of the housing-lid connection on the housing-element connection can be transmitted to the element-side connecting part of the housing-cover connection by means of the element-side connecting part of the housing-element connection.

In an advantageous embodiment, the element-housing connection can be a frictional connection. The non-positive connection can be advantageously realized by a frictional connection, which is based on a frictional force.

In a further advantageous embodiment, the element-lid connection may have at least one stop, with which a rotation of the filter element relative to the housing cover can be limited. This has the advantage that upon reaching the opening position or the closed position of the element-lid connection further rotation of the filter element relative to the housing cover can be prevented. When using a non-positive element-housing connection, this can be designed so that it allows on reaching the at least one stop of the element-cover connection further rotation of the housing pot relative to the housing cover and the filter element by slipping.

In a further advantageous embodiment, the element-lid connection can be a positive rotary connection or rotary plug connection, in particular a bayonet-type connection. A rotary joint can be advantageously realized by a screw connection. Under a rotary plug connection is understood a connection which can be locked and unlocked by a combined rotary-plug movement of the connecting parts relative to each other. Positive-fit rotary joints and rotary connectors have the advantage that forces required for locking and unlocking can be decoupled from forces which the connections can transmit. For locking or unlocking required forces and torques can be minimized. A bayonet-type connection has the advantage that in its locking state, it is stable in the axial direction, in particular tensile; Compound forms. In their unlocked state, however, the connecting parts can be easily separated from each other with little effort with a relative movement axially to the mounting axis. A guide ramp, as used in a bayonet-type connection for the transition from the unlocked state to the locked state and vice versa, can be designed so that with it during a rotational movement the cooperating connecting parts can be almost force-free, in particular frictionless, out.

At least one cover-side connecting part of the element-cover connection is arranged on an adapter element which is fastened to the housing cover. With the adapter element, the housing cover can be easily equipped with the corresponding at least one cover-side connecting part. The connecting part, in particular the adapter element, can advantageously be made of a different material than the housing cover. In particular, the housing cover may be made of a metal, preferably aluminum. Advantageously, the adapter element may be made of plastic. Plastic can also be used to realize complex shapes. Plastic can have a vibration-damping effect. The adapter element is releasably attached to the housing cover. For this purpose, latching connections or screw connections can advantageously be used. A detachable adapter element can be easily replaced, in particular when the at least one head-side connecting part is worn. Advantageously, the adapter element and the housing cover may have positioning aids for positioning the adapter element on the housing cover. The positioning aids can also be designed as anti-rotation, which prevent the adapter element can rotate on the housing cover to the mounting axis. In particular, positioning holes or positioning pins can be provided on the adapter element which cooperate in the installed position with corresponding positioning pins or positioning holes on the housing cover.

In a further advantageous embodiment, the element-housing connection may comprise a rotary body, which may be rotatably arranged in a rotary body against a frictional force, and the rotary body may be connected to the filter element and the rotary body receptacle may be connected to the housing pot or vice versa. Between the rotary body and the rotary body holder can be easily realized a rotary motion or a combined rotary / plug movement. With appropriate dimensioning, a corresponding frictional connection for a non-positive connection can be realized by a friction between the surfaces of the rotating body and the rotary body mounts.

Advantageously, at least one friction element can be arranged between the rotating body and the rotating body receptacle, which can slide on a rotation resistance of the rotating body at or in the rotating body receptacle and / or on the rotating body along a frictional resistance. The use of a friction body prevents the surfaces of the rotating body and the rotary body holder from rubbing against each other directly. In this way, the wear is reduced when rotating the rotating body in the rotary body holder. The friction body can be easily replaced when worn. By using the friction body, it is also easy to compensate for a component tolerance between the rotating body and the rotating body receptacle. Advantageously, the at least one friction body may comprise at least one ring seal. When using an already existing ring seal can be dispensed with a separate friction body. The at least ring seal may advantageously be arranged between the radially outer circumferential wall of the rotary body and the radially inner peripheral wall of the rotary body receptacle. It can slide on a rotation resistance of the rotary body under a frictional resistance on the peripheral wall of the rotary body and / or the peripheral wall of the rotary body receiving.

In a further advantageous embodiment of the rotary body and the rotary body receiving parts of a drain device may be discharged with the approximately contained when separating the housing pot from the housing cover in the housing pot liquid. In this way, the already existing drainage device can be combined with the element-housing connection. It can be used any existing components, whereby the component cost can be reduced. Furthermore, so the space requirement can be reduced. Advantageously, the drain device can be automatically opened when unlocking the housing-lid connection. Preferably, the unlocking can be done by pulling out the rotary body from the rotary body receptacle. Advantageously, the rotary body receptacle can realize a drain opening of the drainage device. When pulling out the rotary body can release the drain opening, so that any liquid contained can drain from the housing pot.

The above-mentioned in connection with the liquid filter according to the invention features and advantages apply to the filter element device according to the invention and their advantageous embodiments accordingly.

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. They show schematically:

1 a longitudinal section of an oil filter of an engine oil circuit of an internal combustion engine a motor vehicle with a filter element, which is arranged interchangeably in a filter pot, which in turn is screwed to a filter head hanging;

2 an exploded view of the oil filter from the 1 in longitudinal section;

three an isometric view of the exploded view of the oil filter from the 2 in the region of an element-head connection of the filter element with the filter head;

4 the detailed view from the three in a different perspective.

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

Embodiment (s) of the invention

In the 1 to 4 is an oil filter 10 shown for engine oil of an oil circuit of an internal combustion engine of a motor vehicle.

The oil filter 10 includes a filter head 12 , in the 1 above, for example, on a frame, not shown, in particular on the crankcase, the internal combustion engine is fixed. The filter head 12 is preferably made of aluminum. The filter head 12 has a supply line 14 for motor oil to be filtered, which is connected to a corresponding oil line of the engine oil circuit. Furthermore, the filter head has 12 about a derivative 16 for filtered engine oil, which in turn is connected to a corresponding oil line of the engine oil circuit.

The filter head 12 includes a cup-like connection portion 18 with a cylindrical peripheral wall. In the connection section 18 is a housing pot 20 of the oil filter 10 attached. The connection section 18 is on a page in the 1 below, open. The connection section 18 has an internal thread on its radially inner peripheral side 22 , In the internal thread 22 can have a corresponding external thread 24 be screwed, which is located on the radially outer peripheral side of the housing pot 20 located. At the internal thread 22 and the external thread 24 These are so-called right-hand threads. The internal thread 22 and the external thread 24 form a detachable housing-head connection 25 between the housing pot 20 the filter head 12 , The connection section 18 has a circumferential sealing surface 26 extending between the edge on the open side of the connecting section 18 and the internal thread 20 located. At the sealing surface 26 lies with mounted housing pot 20 , like in the 1 shown a ring seal 28 close to.

The ring seal 28 is in a corresponding sealing groove in the radially outer peripheral side of the housing pot 20 arranged. The seal groove is located from the filter head 12 from in the axial direction to an assembly axis 30 between the external thread 24 and a stop collar 32 , The stop collar 32 is on the radially outer peripheral side of the housing pot 20 arranged and extends radially outward.

The terms "radial", "axial" and "circumferential" refer, unless otherwise stated, to the mounting axis 30 ,

On the closed end of the connection section 18 is a hollow cylindrical adapter socket 34 arranged. The adapter neck 34 is to the mounting axis 30 coaxial. An interior 36 the adapter socket 34 is with the derivative 16 fluidly connected. The adapter neck 34 protrudes into an interior of the connection section 18 ,

Radially outside is the adapter neck 34 from an inlet room 38 surround. In the inlet room 38 opens the supply line 14 , The inlet space 38 is about a not further interest bypass valve 40 which is in the filter head 12 located, with the derivative 16 connected.

The housing pot 20 is hanging on the filter head 12 assembled. The open side of the housing pot 20 which has a mounting opening 48 forms is the filter head 12 facing. In one of the mounting hole 48 axially opposite ground 42 of the housing pot 20 there is a drain opening 44 , which are coaxial with the mounting axis 30 is. The drain opening 44 is from an approximately hollow cylindrical sleeve section 46 surround. The sleeve section 46 is integral with the ground 42 connected. It extends in the axial direction both into the interior of the housing pot 20 as well as on its outside. The drain opening 44 is part of a flow control 50 , by means of when disassembling the oil filter 10 Engine oil, which is in the housing pot 20 may be contained, can be drained down. At the outer sleeve section 46 a hose can be arranged, through which the engine oil can be discharged in a controlled manner.

Further, on the inside of the housing pot 20 a plurality of spacer elements 52 arranged. The spacer elements 52 are integral with the housing pot 20 connected. The spacer elements 52 are approximately L-shaped, with each one leg of the "L" in the axial direction and a leg extends in the radial direction. The radially extending leg is located at the bottom 42 , the axially extending legs on the radially inner peripheral side of the housing pot 20 , The spacer elements 52 serve as editions and Positioning aids for a filter element 54 , which interchangeable in the housing pot 20 is arranged.

The filter element 54 includes a zigzag folded, circumferentially closed filter medium 56 , In the filter medium 56 it may be, for example, a filter paper or a filter fleece. But it can also be provided a different type of filter medium. The filter element 54 is a total coaxial to the mounting axis 30 built up. It can be called a round filter element. The filter medium 56 is to be filtered by the motor oil to be filtered from radially outside to inside, in the 1 indicated by an arrow 57 , At its end faces is the filter medium 56 with a head end plate 58 , in the 1 above, and a bottom end plate 60 , in the 1 below, each tightly connected. The end discs 58 and 60 are preferably made of plastic. The filter medium 56 is preferably by means of an adhesive connection or welded connection with the end plates 58 and 60 connected. Between the end discs 58 and 60 extends a coaxial support tube 62 made of plastic in an interior 64 of the filter medium 56 , The support tube 62 is always firm with the end discs 58 and 60 connected. Preferably, it can with the end plates 58 and or 60 glued, welded or connected by means of another type of non-positive or positive or cohesive connection. The support tube 62 has in its peripheral wall a plurality of passage openings 66 for engine oil. The support tube 62 lies on the radially inner peripheral side of the filter medium 56 at. The support tube 62 supports the filter medium 56 ,

The bottom end plate 60 is closed throughout. On her the interior 64 remote from the outside is a substantially circular cylindrical lock cylinder 68 the flow control 50 arranged. The lock cylinder 68 is at least with its radially outer peripheral side to the mounting axis 30 coaxial. The lock cylinder 68 is hollow inside. He is on his free, the interior 64 of the filter element 54 facing away from the front side open. In its peripheral wall, the lock cylinder 68 several continuous drainage openings 69 on. The lock cylinder 68 is integral with the bottom end plate 60 connected. The outer diameter of the lock cylinder 68 corresponds approximately to the inner diameter of the sleeve portion 46 , In the axial direction in front of the bottom end plate 60 opposite end face is the radially outer peripheral side of the lock cylinder 68 stepped radially inward. The outer cross section of the lock cylinder 68 is reduced at its free end. With built-in filter element 54 , as in 1 shown this cross-sectional reduction is in a corresponding reduction in cross-section of the discharge opening 44 , The lock cylinder 68 stuck in the assembled state in the sleeve section 46 and thus closes the drain opening 44 , Furthermore, the lock cylinder keeps in the assembled state 68 the filter element 54 on the ground 52 of the housing pot 20 , The lock cylinder 68 and the sleeve section 46 thus form an element-housing connection 70 ,

In the radially outer circumferential side of the lock cylinder 68 are arranged in the axial direction one behind the other two circumferential sealing grooves, in each of which a ring seal 72 is arranged. The drainage holes 69 are located axially between the ring seals 72 , The ring seals 72 seal the lock cylinder 68 against the sleeve section 46 from. The ring seals 72 also ensure a positive connection between the lock cylinder 68 and the sleeve section 46 , This is the element-housing connection 70 So a non-positive connection.

In the assembled state is the bottom end plate 60 with its outside on the radial legs of the spacer elements 52 at. Furthermore, the bottom end plate is located 60 on the inside of the housing pot 20 lying free edge of the sleeve section 46 at. The lock cylinder 68 , and thus the entire filter element 54 , can in the sleeve section 46 against a frictional resistance, which is the frictional element-housing connection 70 causes the mounting axis 30 be rotated and in the axial direction of the sleeve portion 46 pulled out and put back into this.

The head end plate 58 is an annular disc. It has one to the mounting axis 30 coaxial outlet opening 74 , which in a cylindrical connection collar 76 is realized. The connection collar 76 is integral with the head end plate 58 connected. The connection collar 76 extends to the interior 64 remote from the outside of the head end plate 58 in the axial direction. In its radially inner peripheral side, the connection collar 76 a sealing groove with a ring seal 78 on. On its free front side has the connection collar 76 over a plurality of slit-like openings 80 leading to the seal groove of the ring seal 78 are open. The slit-like openings 80 are in particular in the 4 shown.

Radially outside the connection collar 76 are three identical locking elements 82 a total of 84 designated bayonet connection arranged. The locking elements 82 are best in 4 too recognizable. Each of the locking elements 82 has an axial section 86 which extends substantially circumferentially and in the axial direction. The axial section 86 is integral with the head end plate 58 connected. On the head end plate 58 in the axial direction opposite side of the axial section 86 is integrally a radial section 88 arranged. The radial section 88 extends in the circumferential direction and from the axial section 86 essentially radially outward. The axial sections 86 the locking elements 82 extend along an imaginary circle around the mounting axis 30 , On a closing direction of the housing-head connection 25 rear side is at the radial section 88 and the axial section 86 an attack 92 arranged. The closing direction of the housing-head connection 25 is in 1 with an arrow 90 indicated. It concerns the closing direction of rotation of a screw connection with usual right-hand threads. The stop 92 is integral with the radial section 88 and the axial section 86 connected. The centers of the locking elements 82 are circumferentially distributed uniformly at the corners of an imaginary equilateral triangle whose center is on the mounting axis 30 lies.

Between the head end plate 58 and the adapter socket 34 of the filter head 12 is an adapter element 94 made of plastic. The adapter element 94 includes on its the filter element 54 facing side a plate-like section 96 , On the filter head 12 facing side includes the adapter element 94 a neck-like section 98 , The adapter element 94 is a total of approximately coaxial with the mounting axis 30 , It has a continuous opening in the axial direction 100 which are in the neck-like section 98 located. The neck-like section 98 extends in the axial direction on both sides of the plate-like portion 96 , At his the filter head 12 facing free edge, the nozzle-like portion 98 four circumferentially distributed interruptions 102 on. The interruptions 102 allow the neck-like section 98 there can be bent elastically in the radial direction. Between the interruptions 102 are at the free edge of the neck-like section 98 a total of four locking lugs 104 arranged. The locking lugs 104 are located on the radially outer circumferential side of the nozzle-like portion 98 and extend radially outward. The locking lugs 104 are best in the 4 to see. The locking lugs 104 lock in the assembled state of the adapter element 94 , as in 1 shown with a corresponding locking groove 106 in the radially inner circumferential side of the adapter socket 34 of the filter head 12 , In the radially outer circumferential side of the nozzle-like portion 98 is also a circumferential sealing groove with a ring seal 108 provided, which in the assembled state on the radially inner peripheral side of the adapter socket 34 sealingly supported. The sealing groove is located in the axial direction between the interruptions 102 and the plate-like section 96 ,

The plate-like section 96 has radially outward a cylinder portion 110 which is coaxial with the mounting axis 30 extends. With respect to the mounting axis 30 radially opposite sides are in the plate-like portion 96 two positioning holes 112 arranged, which is also in the cylinder section 110 extend and thus interrupt it. The positioning holes 112 correspond with mounted adapter element 94 with positioning pins, not shown in the figures, which with the filter head 12 are connected. In this way, the adapter element 94 non-rotating in the adapter socket 34 fixed. In the area of the positioning holes 112 is the plate-like section 96 on his the filter head 12 side facing strengthened here with no further interest struts.

To the free edge of the cylinder section 110 that is the filter element 54 facing, are three identical Gegenverriegelungselemente 114 the bayonet connection 84 arranged and connected in one piece. The counter-locking elements 114 each extend radially inward and in the circumferential direction. The centers of the counter-locking elements 114 are arranged along an equilateral triangle whose center is on the mounting axis 30 lies. Corresponding circumferential expansions of respective gaps between the counter locking elements 114 are larger than the circumferential dimensions of the locking elements 82 , Likewise, the circumferential dimensions of corresponding gaps between the locking elements 82 greater than the circumferential dimensions of the counter-locking elements 114 , So can the counter locking elements 114 when assembling the adapter element 94 and the filter element 54 with a relative movement axially to the mounting axis 30 on the locking elements 82 to be moved over.

The radially outer peripheral side of the nozzle-like portion 98 is on her the filter element 54 facing side as a sealing surface 116 educated. In the assembled state of the oil filter 10 lies the ring seal 78 of the connection collar 76 at the sealing surface 116 close to. The axial extent of the sealing surface 116 is so big that even when unlocking the bayonet connection 84 , whereby an axial movement of the connection collar 76 on the neck-like section 98 allows the sealing effect is ensured, at least as long as the housing head connection 25 is locked.

With mounted oil filter 10 connects the opening 100 in the neck-like section 98 the interior 64 of the filter element 54 with the interior 36 the adapter socket 34 and thus with the derivative 16 ,

For mounting the oil filter 10 becomes the adapter element 54 with the ring seal 108 Mistake. Then the adapter element 94 with the neck-like section 98 advancing in the axial direction in the adapter socket 34 of the filter head 12 stuck, so far, until the locking lugs 104 in the locking groove 106 lock. This may require the adapter element 94 something about the mounting axis 30 to turn so that the locating pins of the filter head 12 in the positioning holes 112 can dive. The adapter element 94 is so twist-proof in the filter head 12 attached. The adapter element 94 can be designed as a life component. It may change when the filter element 54 with the filter head 12 stay connected.

The filter element 54 comes with its head end disc 58 advancing in the axial direction coaxial with the nozzle-like portion 98 , in the 1 indicated by an arrow 118 , on the adapter element 94 moved. It may be necessary to use the filter element 54 something about the mounting axis 30 to turn so that the locking elements 82 in the gaps between the counter-locking elements 114 can dive. As soon as the radial sections 88 the locking elements 82 in the axial direction behind the counter-locking elements 114 can be the filter element 54 contrary to the closing direction of rotation 90 the housing-head connection 25 relative to the filter head 12 around the mounting axis 30 to be turned around. The radial sections 88 slide on the counter locking elements 114 along. The counter-locking elements 114 thus act as a guide means for the radial sections 88 , In the locked state of the bayonet connection 84 lie the attacks 92 on the corresponding sides of the counter-locking elements 114 and thus prevent further rotation of the filter element 54 relative to the filter head 12 , The filter element 54 hangs, through the bayonet connection 84 held, at the bottom of the filter head 12 ,

The attacks 92 Incidentally, prevent after dipping the locking elements 82 between the counter locking elements 114 the filter element 54 wrongly in closing direction 90 the housing-head connection 25 can be turned. The closing direction of rotation 90 the housing-head connection 25 So corresponds to an opening direction of the bayonet connection 84 and vice versa.

The housing pot 20 comes with its mounting hole 48 advancing in the axial direction, in the 1 in the direction of the arrow 118 , over the filter element 54 pushed. In this case, the bottom end plate 60 through the axial legs of the spacer elements 52 in the housing pot 20 centered and guided. Once the external thread 24 of the housing pot 20 on the internal thread 22 of the connection section 18 of the filter head 12 is applied, the housing pot 20 in closing direction 90 around the mounting axis 30 turned and the housing pot 20 in the connection section 18 screwed.

The lock cylinder 68 dives into the sleeve section 46 in the ground 42 of the housing pot 20 one. Once the ring seals 72 of the lock cylinder 68 in the drain hole 44 of the sleeve section 46 immerse, the non-positive element housing connection 70 built up. A torque which over the housing pot 20 and the frictional element-housing connection 70 on the bottom end plate 60 is transferred, by means of the support tube 62 to the head end disc 58 and so on the locking elements 82 the bayonet connection 84 transfer. A maximum torque, which due to the frictional connection of the element-housing connection 70 from the housing pot 20 on the filter element 54 is greater than a torque which is required to the locking elements 82 opposite the counter locking elements 114 to twist the bayonet connection 84 to unlock. When screwing in further takes the housing pot 20 the filter element 54 with and unlocks the bayonet connection 84 , Once the attacks 92 in the unlocked state of the bayonet connection 84 at the respective adjacent counter locking elements 114 turn on, the further rotation of the filter element 54 relative to the adapter element 94 prevented. This avoids the bayonet connection 84 with the respective adjacent counter-locking elements 114 can lock. Because of the attacks 92 The rotation of the opposite mechanical resistance slide the ring seals 72 on the radially inner circumferential side of the sleeve portion 46 and / or the radially outer circumferential side of the lock cylinder 68 from. The non-positive element housing connection 70 Slips through and thus allows further rotation of the housing pot 20 relative to the filter head 12 and to the filter element 54 ,

In the final assembly state, which in 1 is shown, the drain holes 69 from the sleeve section 46 covered and in the axial direction on both sides in each case with one of the ring seals 72 sealed. The lock cylinder 68 closes the drain opening 44 so that no engine oil can escape there. The stop collar 32 of the housing pot 20 lies at the free edge of the connection section 18 at. The bayonet connection 84 is solved. The ring seal 78 and the sealing surface 116 seal the connection of the connection collar 76 the head end plate 58 with the adapter element 94 from. The connection between the filter element 54 and the adapter element 94 is through the unlocked bayonet connection 84 vibrationally decoupled so that no, for example, operational vibration from the adapter element 94 on the filter element 54 can be transmitted and vice versa.

When assembling the filter element 54 instead of first using the bayonet connection 84 at the filter head 12 to be mounted, even through the mounting hole 48 in the housing pot 20 be plugged in and by means of the element-housing connection 70 in the housing pot 20 be fixed. Subsequently, the housing pot 20 with the filter element contained therein 54 from the bottom of the filter head 12 be screwed. When screwing on the housing pot 20 the bayonet connection locks 84 not, because their closing direction of rotation of the closing direction 90 of the housing pot 20 is opposite. Also with this mounting method is the filter element 54 in the assembled state vibration technology of the adapter element 94 decoupled, as the bayonet connection 84 unlocked from the beginning.

For removal of the filter element 54 for example, for the purpose of replacement, the housing pot 20 contrary to the closing direction of rotation 90 around the mounting axis 30 turned. This is the case-head connection 25 unlocked. The housing pot 20 takes by means of frictional element-housing connection 70 the filter element 54 contrary to the closing direction of rotation 90 With. This causes the locking elements 82 behind the counter locking elements 114 slide so that the bayonet connection 84 is locked again. The filter element 54 is in the axial direction on the filter head 12 fixed. Once the attacks 92 on the counter-locking elements 114 abut, the rotation of the filter element becomes 54 relative to the filter head 12 stopped. The non-positive element housing connection 70 slips on further rotation of the housing pot 20 by. Upon further rotation of the housing pot 20 contrary to the closing direction of rotation 90 becomes the lock cylinder 68 in the axial direction of the sleeve portion 46 pulled out. Once the sleeve section 46 the drain holes 69 can be in the housing pot 20 about contained engine oil through the drain opening 44 drain down.

In addition, when pulling out the ring seals 72 the non-positive element housing connection 70 unlocked. The housing pot 20 can, once the case head connection 25 is completely unlocked, axially to the mounting axis 30 from the filter head 12 , against the arrow 118 after being pulled off downstairs. The filter element 54 hangs, through the bayonet connection 84 fixed, at the bottom of the filter head 12 ,

It can now be in the direction of closing 90 the housing-head connection 25 around the mounting axis 30 relative to the filter head 12 be turned to the bayonet connection 84 to unlock. The approved filter element 54 can be in the axial direction opposite to the arrow 118 be deducted down.

In the above-described embodiment of an oil filter 10 Among others, the following modifications are possible:
The invention is not limited to an oil filter 10 an internal combustion engine of a motor vehicle. Rather, it can also be used in other types of liquid filters, for example in fuel filters or water filters. It can also be used in internal combustion engines outside of motor vehicle technology, for example in industrial engines. Instead of internal combustion engines, the invention can also be used in other technical fields.

The filter head 12 may instead of aluminum from a different material, in particular another metal or a plastic exist.

Instead of the zigzag folded filter medium 56 can also be provided a differently constructed filter medium.

The end discs 58 and or 60 and / or the support tube 62 may be made of a different material, such as a metal instead of plastic.

Instead of the end discs 58 and or 60 It is also possible to use other types of end bodies.

At the end discs 58 and 60 it may also be so-called. Folienendscheiben, which by foaming with the end faces of the filter medium 56 can be connected tightly.

The passage openings 66 of the support tube 62 may also be shaped and / or arranged in other ways than shown in the figures. For example, a part of the peripheral wall of the support tube 62 be impermeable to engine oil.

The connection collar 76 can be made in one piece with the head end plate 58 connected to be realized as a separate component, which is fixed to the end plate 58 can be connected.

There may also be more or fewer than three locking elements 82 be provided.

The adapter element 94 may be made of a different material, such as a metal instead of plastic.

The head-end connecting parts of the bayonet connection 84 , in particular the counter-locking elements 114 and the sealing surface 116 , instead of on the adapter element 94 also directly on the filter head 12 be arranged. On the adapter element 94 can then be dispensed with.

The filter element 54 can also be flowed through from radially inward to outward instead of radially outward. In this case, the functions of the supply line 14 and the derivative 16 be reversed.

The internal thread 22 and the external thread 24 can be left-hand thread instead of right-hand thread. In this case, the closing direction of rotation 90 the housing-head connection 25 and the closing direction of the bayonet connection 84 each directed in reverse.

Instead of the realized as a screw connection housing-head connection 25 can also be a different rotary connection or rotary connector, such as bayonet connection, between the housing pot 20 and the filter head 12 be realized.

Instead of the non-positive element housing connection 70 by means of the lock cylinder 68 , the ring seals 72 and the sleeve section 46 may also be a different type of preferably non-positive connection between the filter element 54 and the housing pot 20 be provided. The frictional connection can also be realized separately from a corresponding sequence control. The lock cylinder 68 can also without interposition of the ring seals frictionally with the sleeve portion 46 interact. Instead of the ring seals 72 It is also possible to provide other types of friction bodies.

Claims (9)

Liquid filter, in particular fuel filter or oil filter ( 10 ), an internal combustion engine, in particular of a motor vehicle, with a filter housing ( 12 . 20 ), which is connected to a fluid line system, the at least one supply line ( 14 ) for liquid to be filtered and at least one derivative ( 16 ) for filtered liquid and having a housing pot ( 20 ) having a mounting opening ( 48 ), on the side of the housing pot ( 20 ) by means of a housing-cover connection ( 24 ) with a housing cover ( 12 ), which is fixedly connected to the liquid line system, wherein the housing-lid connection ( 24 ) by means of a housing rotational movement of the housing pot ( 20 ) relative to the housing cover ( 12 ) around an imaginary mounting axis ( 30 ) can be locked and unlocked, and with a filter element ( 54 ) exchangeable in the housing pot ( 20 ) is arranged so that it is the at least one supply line ( 14 ) of the at least one derivative ( 16 ), and that at the housing cover ( 12 ) separate housing pot ( 20 ) through the mounting opening ( 48 ) axially to the mounting axis ( 30 ) from the housing pot ( 20 ) is removable or can be inserted in this, and the filter element ( 54 ) by means of an element-lid connection ( 84 ) with the housing cover ( 12 ), which can be locked and unlocked, and the filter element ( 54 ) by means of an element-housing connection ( 70 ) with the housing pot ( 20 ) is connected by means of an axial movement of the filter element ( 54 ) relative to the housing pot ( 20 ) with respect to the mounting axis ( 30 ) can be connected and disconnected, characterized in that the element-lid connection ( 84 ) by means of an element rotational movement of the filter element ( 54 ) relative to the housing pot ( 20 ) around the mounting axis ( 30 ) can be locked or unlocked, a closing direction ( 90 ) of the housing rotational movement for locking the housing-lid connection ( 24 ) a closing direction of the element rotation for locking the element-lid connection ( 84 ) and a maximum with the element-housing connection ( 70 ) transmittable torque is greater than a for locking and unlocking the element-lid connection ( 84 ) required torque, wherein at least one cover-side connecting part ( 114 ) of the element-lid connection ( 84 ) on an adapter element ( 94 ) is arranged, which releasably on the housing cover ( 12 ) is attached. Liquid filter according to claim 1, characterized in that the element-housing connection ( 70 ) is a frictional connection. Liquid filter according to claim 1 or 2, characterized in that the element-lid connection ( 84 ) at least one stop ( 92 ), with which a rotation of the filter element ( 54 ) relative to the housing cover ( 12 ) is limited. Liquid filter according to one of the preceding claims, characterized in that the element-lid connection is a positive rotary connection or rotary plug connection. Liquid filter according to claim 4, characterized in that the element-lid connection is a bayonet-type connection. Liquid filter according to one of the preceding claims, characterized in that the element-housing connection ( 70 ) a rotating body ( 68 ), which in a rotary body receptacle ( 46 ) is rotatably disposed against a friction force, and the rotary body ( 68 ) with the filter element ( 54 ) and the rotary body receptacle ( 46 ) with the housing pot ( 20 ) or vice versa. Liquid filter according to claim 6, characterized in that between the rotary body ( 68 ) and the rotary body receptacle ( 46 ) at least one friction body ( 72 ) is arranged, which upon rotation of the rotary body ( 68 ) under a frictional resistance on or in the rotating body receptacle ( 40 ) and / or on the rotary body ( 68 ) can slide along. Liquid filter according to claim 6 or 7, characterized in that the rotary body ( 68 ) and the rotary body receptacle ( 46 ) Parts of a drain device ( 50 ) when disconnecting the housing pot ( 20 ) from the housing cover ( 12 ) in the housing pot ( 20 ) can be drained about contained liquid. Filter element device with a filter element ( 54 ) of a liquid filter, in particular fuel filter or oil filter ( 10 ), an internal combustion engine, in particular of a motor vehicle, which can be exchanged in a housing pot ( 20 ) of a filter housing ( 12 . 20 ), which is connected to a fluid line system, can be arranged so that it has at least one supply line ( 14 ) for liquid to be filtered of the filter housing ( 12 . 20 ) of at least one derivative ( 16 ) for filtered liquid, and that of a housing cover ( 12 ) separate housing pot ( 20 ) through a mounting opening ( 48 ) axially to an assembly axis ( 30 ) from the housing pot ( 20 ) is removable or can be inserted in this, and the filter element ( 54 ) at least one connecting element ( 82 ) a lockable and unlockable element-lid connection ( 84 ), by means of which the filter element ( 54 ) with the housing cover ( 12 ), wherein the housing cover ( 12 ) is firmly connected to the liquid line system and the filter element ( 54 ) a connecting element ( 68 ) an element-housing connection ( 70 ), by means of which the filter element ( 54 ) by means of an axial movement of the filter element ( 54 ) relative to the housing pot ( 20 ) with respect to the mounting axis ( 30 ) separable with the housing pot ( 20 ), characterized in that the at least one connecting element ( 82 ) of the element-lid connection ( 84 ) and the at least one connecting element ( 68 ) of the element-housing connection ( 70 ) are designed and matched to one another such that the element-lid connection ( 84 ) by means of an element rotational movement of the filter element ( 54 ) relative to the housing pot ( 20 ) around the mounting axis ( 30 ) can be locked or unlocked, a closing direction ( 90 ) a housing rotational movement for locking a housing-lid connection ( 29 ) a closing direction of the element rotation for locking the element-lid connection ( 84 ) and a maximum with the element-housing connection ( 70 ) transmissible torque is greater than a for locking and / or unlocking the element-lid connection ( 25 ) required torque, wherein at least one cover-side connecting part ( 114 ) of the element-lid connection ( 84 ) on an adapter element ( 94 ) of the filter element device is arranged, which releasably on the housing cover ( 12 ) is attachable.

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