DE102010035465A1 - Filter for filtration of fluids, filter bowl and filter head - Google Patents

Abstract

The invention relates to a filter (10) for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, with a filter bowl (14) in which a filter element (16) is arranged and a filter head (18) with an inlet and / or has an outlet for the fluid. The filter head (18) and the filter bowl (14) are connected to one another by means of a detachable bayonet-type rotary / plug connection (24). The rotary / plug connection (24) has at least two cooperating locking components (26, 28), one of which is connected to the filter bowl (14) and one is connected to the filter head (18). One of the locking components (28) comprises at least one locking lug (48). One of the locking components (26) comprises at least one recess (58) corresponding to the locking lug (48) with an import / export area (60) for resistance-free assembly and separation of the locking lug (48) and recess (58) and with a closing area (64 ), in which the catch (48) hooks like a bayonet. A biasing element (46) acting between the filter head (18) and the filter pot (14) is provided for realizing a biasing of the latching lug (48) in the recess (58). The recess (58) has a latching shoulder (70) for the latching nose (48) between the closing area (64) and the import / export area (60), which has a heel tip (72) on its side corresponding to the latching nose (48). Has. The catch (48) has a catch tip (52) on its side corresponding to the catch shoulder (70).

Description

Technical area

The invention relates to a filter for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, with a filter pot, in which a filter element is arranged, and a filter head, the at least one inlet for the fluid to be filtered and / or at least one Having outlet for the filtered fluid, wherein the filter head and filter pot are connected by means of a detachable bayonet-type rotary / plug connection, and the rotary / plug connection has at least two cooperating latching components, and one of the latching components with the filter cup and one of the latching components with the filter head is connected, and at least one of the latching components comprises at least one latching lug and one of the latching components at least one corresponding recess with the locking lug with an import / export area for resistance-free assembly and separation of latching lug and recess and with a closing area, in the latching lug hooked bayonet-like, comprises, and at least one acting between the filter head and the filter cup biasing element is provided for realizing a bias of the latching lug in the recess.

The invention also relates to a filter cup of a filter for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, which is adapted to receive a filter element, and which is connectable by means of a detachable bayonet-type rotary / plug connection with a filter head, and the has at least one locking member of the rotary / plug connection, the at least one latching nose or with a locking lug of the filter head recess with an import / export area for resistance-free assembly and separation of locking lug and recess and with a closing area in which hooks the latching nose like a bayonet , And, having an engaging portion for at least one acting between the filter head and the filter cup biasing element for realizing a bias of the locking lug in the recess.

The invention further relates to a filter head of a filter for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine having at least one inlet for the fluid to be filtered and / or at least one outlet for the filtered fluid, and which is suitable by means of a detachable bayonet-type rotary / plug connection with a filter pot, in which a filter element can be arranged to be connected, and the at least one latching lug or at least one corresponding with a latching lug of the filter cup recess with an import / export area for resistance-free assembly and separation latching lug and recess and with a closing region in which the locking lug hooked bayonet-like manner, and having an engaging portion for at least one acting between the filter head and the filter cup biasing element for realizing a bias of the locking lug in the off savings.

State of the art

In the case of air filters known from the market, a filter pot in which a filter element is arranged is detachably connected to a filter head by means of a bayonet connection. The filter head has an inlet for the air to be filtered and an outlet for the filtered air. The bayonet connection comprises a detent which is connected to the filter pot. The filter head has a recess corresponding to the latching lug. The recess has an import / export area for resistance-free assembly and separation of latching lug and recess and a closing area in which hooks the catch nose like a bayonet. Between the filter head and the filter cup, a compression spring is arranged, with which a bias of the locking lug is realized in the recess. It may happen that when the filter cup is connected to the filter head, the latching lug is not completely screwed into the closed region. This can result in that the filter bowl rotates in operation relative to the filter head, so that the latch reaches back into the import / export area and the bayonet connection is released. This leads to malfunctions and can lead to the destruction of components of a consumer to whom the filtered air is to be supplied from the air filter.

The invention has the object of providing a filter, a filter pot and a filter head of the type mentioned in such a way that the filter cup and the filter head can be easily, reliably and safely connected. In particular, a faulty assembly should be as early as possible, especially before, at the latest at the beginning of commissioning of the filter, as clearly as possible from the outside.

Disclosure of the invention

This object is achieved in that the recess between the closing area and the import / export area has a locking shoulder for the locking lug which has a heel point on its side corresponding to the latching lug, and the latching lug on its corresponding with the locking shoulder a latching point has, in such a way that the latching nose at the meeting of the locking tip and the heel point guided by the bias of the biasing element along the catch ledge either slides into the closing area or in the import / export area.

According to the invention, a locking shoulder is provided, which prevents the latching nose from being able to move out of the closed area into the import / export area during operation of the filter due to an uncontrolled movement of the filter head, in particular caused by vibrations of the filter. For connecting and disconnecting the filter cup with the filter head of the locking shoulder can be overcome by a targeted from the outside in particular manually effected movement of the filter cup relative to the filter head. The paragraph tip forms when moving the latch from the import / export area in the closing area a point at which there is no return for the catch. As soon as the locking tip has passed through the shoulder point when activating the rotary / plug connection, the latching lug automatically reaches the closing area by means of the prestressing of the prestressing element. Before that, the catch automatically returns to the import / export area, so that the turn / plug connection is released. This can be clearly recognized immediately before the filter is put into operation, since the filter pot separates from the filter head. This separation is enhanced by the bias of the biasing element. When using the invention in an oil filter or a fuel filter of an internal combustion engine at a faulty installation of the filter pot at the latest when starting the engine by means of oil or fuel pressure from the filter head separated, which can still be noticed in the workshop. The pointed geometries of the locking tip and the heel point thus prevent the locking lug from remaining in an unsecured position on the locking shoulder during assembly, from where it can pass uncontrollably back into the import / export area during operation of the filter. The ratchet tip and the heel point may be edged or rounded. The respective slopes of the ridge tip and heel tips influence the mounting force required to overcome the catch heel with the catch and the force with which a seal between the filter head and the filter pot is pressed against corresponding sealing surfaces.

In an advantageous embodiment, the biasing element may comprise a spring element, in particular a leaf spring or a spiral spring. Spring elements can be easily manufactured and assembled. A leaf spring or a spiral spring, in particular a helical compression spring, can advantageously be fastened to the filter head or to the filter cup, such that a free end is supported during assembly against a corresponding engagement portion of the filter cup or of the filter head. In this way, a bias voltage can be easily generated when assembling the filter pot and the filter head.

In a further advantageous embodiment, the latching lug and the recess can be realized in or on peripheral walls of the filter bowl and the filter head. There, the locking lug and the recess can be accommodated in a space-saving and easy way.

Advantageously, the recess can be arranged in a radially outer peripheral wall and the closing region can be realized as an opening. In this way, the latch is visible from the outside as soon as it is in the closed area. Thus, a further control option for the assembly is created and increases the reliability of the filter.

Furthermore, the sides of the latching lug and the closing area which correspond with one another in a final assembly state of the filter can advantageously be complementary to one another. In this way, the locking lug can be securely and stably held in the closed area, which increases the reliability of the rotary / plug connection.

In a further advantageous embodiment, the filter head can have a valve, in particular a check / throttle valve, in particular in the inlet for the fluid and the filter cup can have an actuating element for the valve. With the actuating element, the valve can be automatically actuated, in particular opened, during the correct installation of the filter pot so that fluid can pass through the filter. In a faulty mounting, especially when using a filter pot without the required actuator, the valve remains unconfirmed, especially closed. This can be recognized immediately after the startup of the filter in that no or little fluid can flow through the filter. A check / throttle valve advantageously combines the function of a check valve, namely to prevent a return of fluid from a consumer into the filter element, with a restriction of the fluid flow. The degree of throttling can preferably be adjusted automatically depending on the design of the actuating element used. Preferably, an actuator tuned to the type of filter element used may automatically adjust the degree of throttling of the check / throttle valve required by the filter element used during assembly of the filter bowl. The backstop function is particularly advantageous, especially when using the filter system in consumers who have longer downtime during which the consumer side of a fluid circuit must not idle. So This variant is particularly favorable, especially when used in emergency generators.

Advantageously, the actuating element may have a connection socket which is coaxial with a rotary / plug-in axis of the rotary / plug connection, in particular on a central tube or an end plate of the filter element, which is connected to an interior of the filter element, and the valve can be a valve housing with a rotary / Thrust axle have coaxial connection piece, which is adapted to receive the connection piece for actuating the valve. Connecting pieces and connecting pieces, which are coaxial to the rotary / thru-axle, can be easily combined with the turn / plug connection. The connecting piece can simply be connected in one piece with the already existing central tube or the already existing end plate of the filter element. Thus, simply each filter element type can be equipped with an individual actuator, with the particular degree of throttling of the check / throttle valve can be adjusted automatically during assembly. S

Further, advantageously, an edge of a corresponding with the valve end face of the connecting piece be jagged. The spaces between the prongs can be easily flowed through by fluid, while the jaws the valve is actuated.

The technical problem is also solved by the filter pot, characterized in that the recess between the closing area and the import / export area has a locking shoulder for the latch, which has a heel point on its side corresponding to the latching side, and the latch on its with the Locking paragraph corresponding side has a locking tip. The features and advantages explained above in connection with the filter according to the invention apply correspondingly to the filter bowl.

The technical problem is further solved by the filter head, characterized in that the recess between the closing area and the import / export area has a locking shoulder for the locking lug, which has a heel point on its side corresponding to the locking lug side, and the locking lug on her with the Locking paragraph corresponding side has a locking tip. The features and advantages explained above in connection with the filter according to the invention and the filter pot apply accordingly 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 an isometric view of a liquid filter in a first assembly phase when connecting a filter pot with a filter head by means of a bayonet-type rotary / plug connection, wherein the liquid filter is shown partially partially transparent;

2 schematically a longitudinal section of the liquid filter from the 1 ;

3 schematically an isometric view of the liquid filter of the 1 and 2 in a second assembly phase;

4 schematically a longitudinal section of the liquid filter from the 3 ;

5 schematically an isometric view of the liquid filter of the 1 to 4 in a third assembly phase;

6 schematically a longitudinal section of the liquid filter from the 5 ;

7 schematically an isometric view of the liquid filter of the 1 to 6 in a final assembly state;

8th schematically a longitudinal section of the liquid filter from the 7 ;

9 schematically an isometric view of the liquid filter of the 7 wherein the filter head is shown as an edge model;

10 schematically a settlement of a peripheral wall of the filter head with two recesses of the rotary / plug connection of the liquid filter from the 1 to 9 ;

11 schematically a section of the developed peripheral wall in the region of one of the recesses of the 10 along the section line XI-XI.

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

Embodiment (s) of the invention

In the 1 to 9 is a section of a liquid filter 10 for filtration of Liquid, such as fuel or oil, an otherwise not shown internal combustion engine of a motor vehicle shown in different assembly phases.

The liquid filter 10 includes a filter housing 12 made from a cylindrical filter pot 14 in which a round filter element 16 is arranged, and a filter head 18 is composed.

The filter head 18 has an inlet 20 for the liquid to be filtered and an outlet 22 for the filtered liquid. The inlet 20 and outlet 22 are for the sake of clarity only in the 2 indicated. The filter head 18 is in the way not of interest here about the outlet 22 and the inlet 20 connected to a fluid system of the internal combustion engine, not shown.

The filter pot 14 is from below by means of a detachable bayonet-type turn / plug connection 24 with the filter head 18 connected.

The turn / plug connection 24 points at the filter head 18 a cylinder holder 26 on, in which a coaxial connecting cylinder 28 of the filter pot 14 plugged. The connecting cylinder 28 and the cylinder intake 26 are made of cast aluminum.

The connecting cylinder 28 is a hollow, open at both ends circular cylinder, in the direction of a in the 2 shown rotary / thru axle 30 the turn / plug connection 24 is graded several times.

The connecting cylinder 28 indicates at its one in the 1 to 9 for reasons of better clarity not shown bottom of the filter pot 14 facing end face a radially outwardly extending circumferential step 32 on. Radially outward in the peripheral side of the circumferential step 32 There is a circumferential pot-sealing groove 34 with a pot ring seal 36 , The circumference level 32 is with the edge of a pot-housing wall 33 of the filter pot 14 densely crinkled. On the bottom of the filter pot 14 opposite side of the peripheral level 32 the radially outer peripheral side of the connecting cylinder tapers 28 conical to a cylinder abutment section 38 ,

Before his the bottom of the filter pot 14 facing away, free end face, facing the connecting cylinder 28 a circumferential head-sealing groove 40 with a head ring seal 42 on. The edge of the connection cylinder 28 at its free end face is bent radially inwardly and forms an attack section 44 for a leaf spring explained below 46 in the cylinder holder 26 ,

The connecting cylinder 28 has two identical locking lugs 48 of which one in the 1 is visible. The locking lugs 48 are on with respect to the rotary / thru axle 30 diametrically opposite sides. They rise on the radially outer peripheral side in the radial direction. Every catch 48 viewed in the radial direction has the shape of a triangle whose tips are rounded. A leadership page 50 the latch 48 runs on the bottom of the filter pot 14 opposite side in the circumferential direction. A catch tip 52 the latch 48 points to the bottom of the filter pot 14 ,

In the open side of the cup-shaped cylinder holder 26 is the connecting cylinder 28 plugged in, so that the peripheral wall of the cylinder receptacle 26 the connecting cylinder 28 surrounds radially outside. The radially inner peripheral side of the cylinder receptacle 26 is complementary to the radially outer peripheral side of the connecting cylinder 28 stepped. In the area of the open end of the cylinder receptacle 26 is accordingly a to the cylinder abutment section 38 fitting, conical reception system section 54 , On a floor 56 the cylinder intake 26 the leaf spring is supported 46 from. She is in a not interesting way here in the cylinder recording 26 attached.

The cylinder intake 26 includes in its radially inner peripheral side two identical, with the locking lugs 48 of the connection cylinder 28 corresponding recesses 58 , The dimensions of the recesses 58 and the detents 48 in the radial direction are adapted to each other so that the locking lugs 48 inside the recesses 58 can be moved without resistance. A settlement of the peripheral wall of the connecting cylinder 28 with the two recesses 58 is in the 10 shown. Because of the better orientation is in the 10 a projection of the rotary / thru-axle 30 indicated. The 11 shows a section of the settlement of the peripheral wall of the 10 in the area of one of the recesses 58 along the section line XI-XI.

Every recess 58 has an import / export area 60 which extends substantially in the axial direction. The import / export area 60 flows into the receiving investment section 54 , In a front area of the receiving attachment section 55 between the confluence of the import / export area 60 and the free edge of the cylinder receptacle 26 is the distance in the radial direction between the receiving contact section 54 and the rotary / thru-axle 30 greater than the distance in the radial direction between the rotary / thru-axle 30 the back wall of the import / export area 60 so that the latch 48 There can be moved without resistance. The import / export area 60 is at its confluence with the reception contact section 55 opposite end by an oblique to the rotary / thru-axle 30 extending translation surface 62 limited.

In front of the translation surface 62 goes the import / export area 60 in a closing area 64 over, as a breakthrough in the peripheral wall of the cylinder receptacle 26 is realized. The closing area 64 extends with respect to a closing direction of rotation of the filter cup 14 back side of the import / export area 60 in the circumferential direction. The closing direction is in the 4 and 10 indicated by an arrow 66 , The translation surface 62 of the import / export area 60 indicates at the transition to the closing area 64 a slight kink in the 9 and 10 is shown.

The closing area 64 becomes on the translation surface 62 in the axial direction opposite side by a V-shaped locking contact surface 68 limited. The locking contact surface 68 and the translation surface 62 run in the rear section of the closing area 64 V-shaped towards each other. The locking contact surface 68 is overall complementary to a the raster tip 52 having detent side 73 the latch 48 ,

The locking contact surface 68 goes into a catch paragraph 70 for the catch 48 over, which is between the closing area 64 and the import / export area 60 located. The in closing direction 66 rear flank of the locking shoulder 70 forms the front part of the locking contact surface 68 , The locking paragraph 70 protrudes in the axial direction in the recess 58 into it. He points to his the free edge of the cylinder 26 side facing away from the assembly of the liquid filter 10 with the catch 48 of the filter pot 14 Corresponds, a rounded heel point 72 on.

In the filter pot 14 is that to the rotary / thru axle 30 coaxial filter element 16 arranged. The filter element 16 includes a zigzag-folded filter medium 74 whose end faces each with an end plate 76 are connected. In the 2 . 4 . 6 and 8th is only the filter head 18 facing end plate 76 shown.

In a clean-sided interior 78 of the filter element 16 extends between the end discs 76 coaxial with the rotary / thru-axle 30 a central tube 80 , The center tube 80 has in its peripheral wall a plurality of passage openings for the liquid. The filter head 18 facing end plate 76 has one to the center tube 80 coaxial opening on.

Radially outside the filter element 16 is located on the raw side of the filter element 16 a pot annulus 82 , The liquid to be filtered flows through the filter element 16 from the pot annulus 82 to the interior 78 ,

The pot annulus 82 is via annular space connecting lines, for the sake of clarity in the 1 to 9 not shown, with an inlet annulus 84 connected. The inlet annulus 84 is located inside the connecting cylinder 28 and gets through the end disk 76 and in the final assembly state of the liquid filter 10 through the ground 56 the cylinder intake 26 limited. Into the inlet annulus 84 opens the inlet 20 of the filter head 18 ,

On the ground 56 the cylinder intake 26 is one to the rotary / thru axle 30 Coaxial valve seat 86 arranged in the form of an open at both ends hollow cylinder having a coaxial opening in the bottom 56 surrounds. The valve holder 86 extends into the interior of the cylinder holder 26 ,

In the valve holder 86 is a check / throttle valve 88 attached. The check / throttle valve 88 has a cup-shaped valve housing 90 on, which to the open end of the cylinder receptacle 26 is open. The valve housing 90 has circumferentially one in the 2 . 4 . 6 and 8th shown outlet liquid opening 92 to the outlet 22 leads. The outlet 22 extends along the valve seat 86 and through the floor 56 of the filter head 18 ,

Between the outlet fluid port 92 and the open end of the valve housing 90 located on the radially inner peripheral side of a circumferential projection 94 , The section of the peripheral wall of the valve housing 90 on the outlet fluid port 92 in the axial direction opposite side of the projection 94 serves as a connecting piece 96 for a connection piece explained below 98 of the filter element 16 , The edge of the connecting piece 96 at its free end face is bevelled on the radially inner side for ease of assembly.

A cup-shaped throttle valve piston 100 is in the valve body 90 slidably disposed in the axial direction. The bottom of the throttle valve piston 100 is located on the open end of the valve body 90 facing side. He has a passage opening 104 for the liquid. On the periphery, the throttle valve piston 100 a valve fluid port 102 on which in the in the 8th illustrated upper position in which the check / throttle valve 88 has a minimum throttle effect, with the outlet fluid port 92 flees.

A check valve piston 106 is in the throttle valve piston 100 slidably disposed in the axial direction relative to the latter. With the check valve piston 106 can the passage opening 104 be closed. On the the passage opening 104 facing away from the check valve piston 106 a dome, with a spiral spring on one end 108 is plugged. The spiral spring 108 rests against the check valve piston 106 from. The opposite end of the coil spring 108 is over a dome of a housing cover 110 of the valve housing 90 plugged and supported against the housing cover 110 from. The spiral spring 108 will be in the upper position of the throttle valve piston 100 pressed together and exerts a closing force on the check valve piston 106 out. The closing force presses the check valve piston 106 against a passage opening 104 surrounding sealing surface at the bottom of the throttle valve piston 100 , so that the passage opening 104 below a certain fluid pressure on the clean side of the filter element 16 closed is.

The check valve piston 106 also has a valve piston seal 112 on. The valve piston seal 112 lies in the closed position of the throttle valve piston 100 close to the sealing surface.

The tubular connecting piece 98 made of polyamide serves as an actuator for the check / throttle valve 88 , The connection piece 98 is to the turn / thru axle 30 coaxial. It is integral with a front side of the central tube 80 of the filter element 16 arranged and thus with the filter pot 14 connected. The connection piece 98 extends through the central opening of the end plate 76 through and to the interior 78 of the filter element 16 open. The edge of the free end face of the connecting piece 98 is jagged.

One to the center tube 80 adjacent sealing section 114 of the connecting piece 98 has a sealing groove in its radially outer peripheral side 116 with a ring seal 118 on. The outer diameter of the seal section 114 is smaller than the inner diameter of the connection piece 96 of the valve housing 90 and larger than the inner diameter of the projection 94 of the valve housing 90 ,

From the center tube 80 from in the axial direction behind the sealing portion 114 closes after a radially inwardly extending stop step 120 an operating section 122 at. The outer diameter of the actuating portion 122 is smaller than the inner diameter of the projection 94 of the valve housing 90 ,

For mounting the liquid filter 10 is in a first assembly phase, as in the 1 and 2 shown, the filter pot 14 from below axially to the rotary / thru-axle 30 with the connecting cylinder 28 moving ahead in the direction of an arrow 124 in the cylinder receptacle 26 of the filter head 18 plugged. The conical reception attachment section 54 the cylinder intake 26 facilitates the centering of the connection cylinder 28 , It may be necessary to use the filter pot 14 relative to the filter head 18 something about the rotary / thru-axle 30 to turn around the locking lugs 48 with the import / export areas 60 the recesses 58 to bring into line. In the import / export areas 60 become the catch noses 48 moved without further resistance when further inserted.

When inserting the filter pot 16 in the filter head 18 also dives the connection piece 98 in the connecting piece 96 the check / throttle valve 88 one.

Upon further insertion of the connection cylinder 28 in the cylinder receptacle 26 comes in a second mounting position, which in the 3 and 4 shown is the free side of the leaf spring 46 against the attack section 44 of the connection cylinder 28 , With the leaf spring 46 creates a bias in the axial direction between the filter head 18 and the filter pot 14 realized.

Subsequently, the filter pot 14 relative to the filter head 18 in closing direction 66 around the turn / thru axle 30 turned. Here are the locking lugs e 48 depending on the insertion depth at the translation surface 62 or at the in the closed direction of rotation 66 front sloping flanks of the locking heels 70 at the Rastabsätzen 70 past the closing areas 64 guided, which facilitates the assembly.

If a wrong connection piece 98 is used, whose stop level 120 at the lead 94 abuts before the latching noses 48 at the height of the gaps between the heel points 72 and the translation surface 62 are, can the locking heels 70 from the locking lugs 48 can not be overcome, so the turn / plug connection 24 can not be activated. The locking lugs 48 get back to the import / export areas 60 and the filter pot 14 is by means of the bias of the leaf spring 46 from the cylinder holder 26 pressed out.

In the 5 and 6 a third assembly phase is shown, in which the latching points 52 the locking lugs 48 and the heel points 72 the locking heels 70 lie together.

In the event that the locking spikes 52 in the case of premature adjustment of the externally acting rotational movement in the closing direction of rotation 66 the heel points 72 have not overcome, causes the bias of the leaf spring 46 in that the latching noses 48 at the in the closing direction 66 front sloping flanks of the locking heels 70 be guided along and back to the import / export area 60 reach. From there, the locking lugs 48 Resistant from the import / export areas 60 pressed. The filter pot 14 becomes instantly recognizable from the filter head 18 separated.

The pointed geometries of the locking lugs 48 and the locking heels 70 so prevent the locking lugs 48 on the Rastabsätzen 70 from which they may later enter the import / export sectors, including after a longer period of operation 60 can get back and the connection between the filter head 18 and the filter pot 14 would be separated.

If the latching peaks 52 in the premature adjustment of the outer rotational movement, the heel points 72 have already overcome, the bias of the leaf spring ensures 46 for the locking lugs 48 at the in the closing direction 66 front sloping flanks of the locking surfaces 68 along in the closing areas 64 be pressed into it. In the in the 7 and 8th shown final assembly state of the liquid filter 10 the locking lugs get caught 48 bayonet-like in the closing areas 64 , The rest pages 73 the locking lugs 48 lie flat stable on the locking surfaces 68 at. The locking lugs 48 are then from the outside in the breakthrough of the closing area 64 visible, noticeable.

With correctly installed filter pot 14 using the filter element 16 with a matching connecting piece 98 In the final assembly state, the jagged end face of the connection piece abuts 98 against the bottom of the throttle valve piston 100 and pushes it against the spring force of the coil spring 108 to the housing cover 110 so that the outlet fluid port 92 and the valve fluid opening 102 aligned. The check / throttle valve 88 is open in the forward direction. By varying the axial extent with different connecting pieces different throttle degrees for the check / throttle valve can for different filter elements 88 be specified.

When using a filter element 16 another type, which no or a different type of connection 98 which is not suitable to the throttle valve piston 100 to the housing cover 110 to move towards, or if the filter pot 14 is not mounted correctly, overlap the outlet fluid port 92 and the valve fluid opening 102 too little or not at all, allowing the flow of fluid through the outlet 22 is throttled. This can be done easily and right at the start of the liquid filter 10 be recognized on a too low or nonexistent fluid flow. The check / throttle valve 88 thus combines a backstop for liquid from the outlet 22 with the throttle function in particular for fault detection. The backstop device also prevents the consumer side from running when the consumer is not operating.

In all embodiments of a liquid filter described above 10 Among others, the following modifications are possible:

The invention is not limited to use in internal combustion engines of motor vehicles. Rather, it can also be used in other types of internal combustion engines, for example in industrial engines or compressors. The invention may also be used with filters for filtering other types of liquid or gaseous fluids.

The filter pot 14 can instead of hanging down from above or obliquely on the appropriately oriented filter head 18 be mounted.

Instead of the round filter element 16 can also be a different type of filter element 16 , For example, an angular or oval filter element may be provided. The pot housing wall 33 of the filter pot 14 may also have another shape, such as a conical shape, instead of a cylindrical shape.

The filter element 16 can instead of the zigzag folded filter medium 74 also have a different type of trained filter medium.

The cylinder intake 26 and the connecting cylinder 28 may also be of a different material, such as another metal, a plastic or a mixed material, instead of cast aluminum.

Instead of the connection cylinder 28 with the locking lugs 48 and the cylinder holder 26 with the recesses 58 can also be provided at least two different cooperating locking components.

The connecting cylinder 28 with the locking lugs 48 can take place with the filter pot 14 also with the filter head 18 be connected. Accordingly, then the cylinder recording 26 with the recesses 58 with the filter pot 14 connected.

The locking lugs 48 can take place at the connecting cylinder 28 also in the cylinder holder 26 be arranged. Accordingly, then the recesses 58 in the connection cylinder 28 appropriate.

It can also more or less than two locking lugs 48 and / or more or less than two recesses 58 be provided.

The locking lugs and the respective recesses may be different instead of identical. They can also be arranged asymmetrically to the rotary / thru-axle. In this way, by means of the position and / or shape of the latching lugs / recess pairings, the orientation of the filter cup on the filter head can be predetermined.

The rast tips 52 the locking lugs 48 and the heel points 72 the locking heels 70 can be edgy instead of rounded.

Instead of the leaf spring 46 It is also possible to use a different kind of biasing element, for example a spiral spring or an elastic element, for example made of plastic.

The connection piece 98 can take place with the center tube 80 also with a corresponding end plate of the filter element 16 be connected.

The connection piece 98 may be made of a different material, preferably a plastic, instead of polyamide.

Claims (10)

Filter ( 10 ) for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, as well as for air deflation, with a filter pot ( 14 ), in which a filter element ( 16 ) and a filter head ( 18 ), which has at least one inlet ( 20 ) for the fluid to be filtered and / or at least one outlet ( 22 ) for the filtered fluid, wherein the filter head ( 18 ) and filter pot ( 14 ) by means of a detachable bayonet-type rotary / plug connection ( 24 ), and the turn / plug connection ( 24 ) at least two cooperating latching components ( 26 . 28 ), and one of the latching components ( 28 ) with the filter pot ( 14 ) and one of the locking components ( 26 ) with the filter head ( 18 ), and at least one of the latching components ( 28 ) at least one latch ( 48 ) and one of the latching components ( 26 ) at least one with the latch ( 48 ) corresponding recess ( 58 ) with an import / export area ( 60 ) for resistance-free assembly and separation of locking lug ( 48 ) and recess ( 58 ) and with a closing area ( 64 ), in which the catch ( 48 ) hooked, comprises, and at least one between the filter head ( 18 ) and the filter pot ( 14 ) acting biasing element ( 46 ) is provided for the realization of a bias of the locking lug ( 48 ) in the recess ( 58 ), characterized in that the recess ( 58 ) between the closing area ( 64 ) and the import / export area ( 60 ) a locking shoulder ( 70 ) for the catch ( 48 ), which at its with the detent ( 48 ) corresponding page a paragraph peak ( 72 ), and the latch ( 48 ) on her with the locking shoulder ( 70 ) corresponding side a locking tip ( 52 ), in such a way that the catch ( 48 ) at the meeting of the locking tip ( 42 ) and the heel point ( 72 ) by means of the bias of the biasing element on the locking shoulder ( 70 ) either in the closing area ( 64 ) or the import / export area ( 60 ) slides off. Filter according to claim 1, characterized in that the biasing element is a spring element, in particular a leaf spring ( 46 ) or a coil spring. Filter according to claim 1 or 2, characterized in that the detent ( 48 ) and the recess ( 58 ) in or on peripheral walls of the filter pot ( 14 ) and the filter head ( 18 ) are realized. Filter according to claim 3, characterized in that the recess ( 58 ) in a radially outer peripheral wall ( 26 ) and the closing area ( 64 ) is realized as a breakthrough. Filter according to one of the preceding claims, characterized in that in a final assembly state of the filter ( 10 ) corresponding pages ( 68 . 73 ) of the catch ( 48 ) and the closing area ( 64 ) are complementary to each other. Filter according to one of the preceding claims, characterized in that the filter head ( 18 ) a valve, in particular a check / throttle valve ( 88 ), in particular in the inlet ( 20 ) for the fluid and the filter pot ( 14 ) an actuating element ( 98 ) for the valve ( 88 ) having. Filter according to claim 6, characterized in that the actuating element to a rotary / thru axle ( 30 ) of the turn / plug connection ( 24 ) coaxial connecting pieces ( 98 ) in particular on a central tube ( 80 ) or an end plate ( 76 ) of the filter element ( 16 ) having an interior ( 78 ) of the filter element ( 16 ), and the valve ( 88 ) a valve housing ( 90 ) with one to the rotary / thru axle ( 30 ) coaxial connecting piece ( 96 ), which is suitable, the connecting piece ( 98 ) for actuating the valve ( 88 ). Filter according to claim 7, characterized in that an edge of one with the valve ( 88 ) corresponding end face of the connecting piece ( 98 ) is jagged. Filter pot ( 14 ) of a filter ( 10 ) for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, as well as for air deflation, in particular according to one of the preceding claims, which is suitable, a filter element ( 16 ), and by means of a detachable bayonet-type rotary / plug connection ( 24 ) with a filter head ( 18 ) is connectable, and the at least one latching component ( 28 ) of the turn / plug connection ( 24 ), which has at least one latching lug ( 48 ) or one with a catch of the filter head ( 18 ) corresponding recess with an import / export area for resistance-free assembly and separation of locking lug and recess and with a closing area in which the locking lug hooked like a bay, comprising, and an attack section ( 44 ) for at least one between the filter head ( 18 ) and the filter pot ( 14 ) acting biasing element ( 46 ) has to realize a bias of the locking lug ( 48 ) in the recess, characterized in that the recess ( 58 ) between the closing area ( 64 ) and the import / export area ( 60 ) a locking shoulder ( 70 ) for the catch ( 48 ), which at its with the detent ( 48 ) corresponding page a paragraph peak ( 72 ), and the latch ( 48 ) on her with the locking shoulder ( 70 ) corresponding side a locking tip ( 52 ) Has. Filter head ( 18 ) of a filter ( 10 ) for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, in particular according to one of claims 1 to 8, the at least one inlet ( 20 ) for the fluid to be filtered and / or at least one outlet ( 22 ) for the filtered fluid, and which is suitable, by means of a detachable bayonet-type rotary / plug connection ( 24 ) with a filter pot ( 14 ), in which a filter element ( 16 ) can be arranged to be connected, and the at least one latching lug or at least one with a latching lug ( 48 ) of the filter pot ( 14 ) corresponding recess ( 58 ) with an import / export area ( 60 ) for resistance-free assembly and separation of locking lug ( 48 ) and recess ( 58 ) and with a closing area ( 64 ), in which the catch ( 48 ) hooked, comprises, and the one attacking section ( 56 ) for at least one between the filter head ( 18 ) and the filter pot ( 14 ) acting biasing element ( 46 ) has to realize a bias of the locking lug ( 48 ) in the recess ( 58 ), characterized in that the recess ( 58 ) between the closing area ( 64 ) and the import / export area ( 60 ) a locking shoulder ( 70 ) for the catch ( 48 ), which at its with the detent ( 48 ) corresponding page a paragraph peak ( 72 ), and the latch ( 48 ) on her with the locking shoulder ( 70 ) corresponding side a locking tip ( 52 ) Has.

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