WO2012025640A1

WO2012025640A1 - Filter for filtering fluids, filter bowl and filter head

Info

Publication number: WO2012025640A1
Application number: PCT/EP2011/067292
Authority: WO
Inventors: André Rösgen
Original assignee: Mann+Hummel Gmbh
Priority date: 2010-08-21
Filing date: 2011-10-04
Publication date: 2012-03-01
Also published as: RU2572989C2; EP2605849A1; BR112013003976A2; RU2013112608A; CN103201007B; DE102010035465A1; CN103201007A

Abstract

The invention relates to a filter (10) for filtering in particular liquid fluids, in particular fuel or oil, in particular of an internal combustion engine, comprising a filter bowl (14), in which a filter element (16) is arranged, and a filter head (18), which comprises an inlet and/or an outlet for the fluid. The filter head (18) and the filter bowl (14) are connected to each other by means of a detachable bayonet-like rotary/plug connection (24). The rotary/plug connection (24) comprises at least two cooperating catch components (26, 28), of which one is connected to the filter bowl (14) and the other to the filter head (18). One of the catch components (28) comprises at least one detent (48). One of the catch components (26) comprises at least one recess (58) corresponding to the detent (48) and has an insertion/removal region (60) for joining and separating the detent (48) and recess (58) without resistance and also has a closing region (64) with which the detent (48) engages in a bayonet-like manner. In order to implement a prestress of the detent (48) in the recess (58), a prestressing element (46) that acts between the filter head (18) and the filter bowl (14) is provided. Between the closing region (64) and the insertion/removal region (60), the recess (58) comprises a catch shoulder (70) for the detent (48), wherein said shoulder has a shoulder tip (72) on the side thereof which corresponds to the detent (48). On the side corresponding to the catch shoulder (70), the detent (48) comprises a catch tip (52).

Description

description

Filter for filtration of fluids, filter bowl and filter head Technical field

The invention relates to a filter for the filtration of in particular liquid Fluids, in particular fuel or oil, in particular an internal combustion engine, and for Luftentölung 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 outlet for the filtered fluid, wherein the filter head and filter cup are connected to each other 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 a the latching components is connected to the filter head, 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 region in which the locking 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 locking lug in the recess.

The invention further relates to a filter pot 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 can be connected to a filter head by means of a detachable bayonet-type rotary / plug connection. and the at least one latching component of the rotary / plug connection, the at least one latching nose or with a locking lug of the filter head corresponding recess with an import / export area for resistance-free assembly and separation of latching lug and recess and with a closing area in which the latching lug A bayonet-like hooked, um- summarizes, 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 one Internal combustion engine, which has at least one inlet for the fluid to be filtered and / or at least one outlet for the filtered fluid, and which is adapted to be connected by means of a detachable bayonet-type rotary / plug connection with a filter cup in which a filter element can be arranged be, and the at least one locking lug or at least one corresponding with a detent of the filter cup 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 locked, surrounds, 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.

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 early, especially before, at the latest Start of commissioning of the filter, as clearly visible from the outside.

Disclosure of the invention

This object is achieved in that the recess between see 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 lug, and the latch on its corresponding with the locking shoulder side has a locking tip, such that the locking lug slides in the meeting of the locking tip and the heel tip by means of the bias of the biasing element along the locking 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 reaching the import / export area during operation of the filter due to an uncontrolled movement of the filter head, in particular caused by vibration of the filter, relative to the filter bowl. 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 is at a faulty installation of the filter pot no later than the first start of the internal combustion engine by means of oil or fuel pressure separated from the filter head, which can still be noticed in the workshop. The pointed geometries of the locking tip and the heel point thus prevent the locking lug during assembly in an unsecured position on the locking shoulder remains from where it can pass uncontrolled 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 joining the filter pot and the filter head together.

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 nose 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 set 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 be 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 in particular, with which the degree of throttling of the check / throttle valve can be adjusted automatically during assembly.

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 detent nose, which has a heel point on its side corresponding to the detent nose, and the detent on her with the locking shoulder 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 consider the features disclosed in combination in the drawing, the description and the claims in combination and combine these into meaningful further combinations. Show it

1 shows 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. 2 shows schematically a longitudinal section of the liquid filter from the figure

1 ;

FIG. 3 schematically shows an isometric view of the liquid filter from FIGS. 1 and 2 in a second assembly phase;

FIG. 4 schematically shows a longitudinal section of the liquid filter from the FIGURE

3;

FIG. 5 schematically shows an isometric view of the liquid filter from FIGS. 1 to 4 in a third assembly phase;

FIG. 6 schematically shows a longitudinal section of the liquid filter from the FIGURE

5;

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

Figure 8 schematically shows a longitudinal section of the liquid filter of the figure

7;

FIG. 9 schematically an isometric view of the liquid filter from FIG. 7.

FIG. 10 schematically shows a development of a peripheral wall of the filter head with two recesses of the rotary / plug connection of the liquid filter from FIGS. 1 to 9;

Figure 1 1 schematically shows a section of the unwound peripheral wall in the region of one of the recesses of Figure 10 along the section line Xl-Xl.

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

Embodiment (s) of the invention

FIGS. 1 to 9 show a detail of a liquid filter 10 for filtering liquid, for example fuel or oil, of an otherwise not shown internal combustion engine of a motor vehicle in different assembly phases. The liquid filter 10 comprises a filter housing 12 which is composed of a cylindrical filter cup 14, in which a round filter element 16 is arranged, and a filter head 18. The filter head 18 has an inlet 20 for the liquid to be filtered and an outlet 22 for the filtered liquid. For better clarity, the inlet 20 and outlet 22 are indicated only in FIG. The filter head 18 is connected in a manner not of further interest here via the outlet 22 and the inlet 20 to a fluid system, not shown, of the internal combustion engine.

The filter cup 14 is connected from below by means of a detachable bayonet-type rotary / plug connection 24 with the filter head 18. The rotary / plug connection 24 has on the filter head 18 a cylinder receptacle 26, in which a coaxial connecting cylinder 28 of the filter cup 14 is inserted. The connecting cylinder 28 and the cylinder holder 26 are made of cast aluminum.

The connecting cylinder 28 is a hollow circular cylinder which is open on both end faces and which is stepped several times in the direction of a rotary / through-axle 30 of the rotary / plug connection 24 shown in FIG.

The connecting cylinder 28 has on its one in Figures 1 to 9 for reasons of clarity not shown bottom of the filter bowl 14 facing end face on a radially outwardly extending peripheral step 32. Radially outward in the peripheral side of the circumferential step 32 is a circumferential pot-sealing groove 34 with a pot-ring seal 36. The peripheral stage 32 is crimped tightly with the edge of a pot-housing wall 33 of the filter cup 14. On the side of the circumferential step 32 opposite the bottom of the filter bowl 14, the radially outer circumferential side of the connecting cylinder 28 tapers conically to form a cylinder abutment section 38.

Before its the bottom of the filter cup 14 facing away, free end face, the connecting cylinder 28 has a circumferential head-sealing groove 40 with a head-ring seal 42. The edge of the connecting cylinder 28 on its free end side is bent radially inwards and forms an engaging portion 44 for a later explained leaf spring 46 in the cylinder receptacle 26th

The connecting cylinder 28 has two identical locking lugs 48, one of which is visible in the figure 1. The locking lugs 48 are located with respect to the Turn- / thru-axle 30 diametrically opposite sides. They rise on the radially outer peripheral side in the radial direction. Each detent 48 has viewed in the radial direction the shape of a triangle whose tips are rounded. A guide side 50 of the latching nose 48 extends on the side facing away from the bottom of the filter pot 14 in the circumferential direction. A latching tip 52 of the detent 48 points to the bottom of the filter cup 14th

In the open side of the cup-shaped cylinder receptacle 26 of the connecting cylinder 28 is inserted, so that the peripheral wall of the cylinder receptacle 26 surrounds the connecting cylinder 28 radially outward. The radially inner peripheral side of the cylinder receptacle 26 is stepped complementary to the radially outer peripheral side of the connecting cylinder 28. In the region of the open end side of the cylinder receptacle 26, a conical receiving contact section 54 matching the cylinder abutment section 38 is accordingly located. The leaf spring 46 is supported on a bottom 56 of the cylinder receptacle 26. It is fastened in the cylinder receptacle 26 in a manner not of further interest here.

The cylindrical receptacle 26 comprises in its radially inner peripheral side two identical recesses 58 corresponding to the detents 48 of the connecting cylinder 28. The expansions of the recesses 58 and the detents 48 in the radial direction are adapted to one another such that the detents 48 within the recesses 58 can be moved without resistance. A development of the peripheral wall of the connecting cylinder 28 with the two recesses 58 is shown in FIG. For better orientation, a projection of the rotary / thru-axle 30 is indicated in FIG. FIG. 11 shows a section of the development of the peripheral wall from FIG. 10 in the region of one of the recesses 58 along the section line X1-X1 there.

Each recess 58 has an import / export area 60 which extends substantially in the axial direction. The import / export area 60 terminates in the receiving abutment portion 54. In a front portion of the receiving abutment portion 54 between the junction 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 abutment portion 54 and the rotary / thru-axle 30 larger as the distance in the radial direction between the rotary / thru-axle 30 of the rear wall of the import / export area 60, so that the locking lug 48 can be moved without resistance there. The import / export region 60 is bounded at its end opposite the junction in the receiving-contact portion 54 by a translational surface 62 running at an angle to the rotary / thru-axle 30.

In front of the translation surface 62, the import / export region 60 transitions into a closing region 64, which is realized as an opening in the peripheral wall of the cylinder receptacle 26. The closing area 64 extends on the rear side of the import / export area 60 in the circumferential direction with respect to a closing direction of rotation of the filter cup 14. The closing direction of rotation is indicated in FIGS. 4 and 10 by an arrow 66. The translation surface 62 of the entry / export region 60 has a slight bend at the transition to the closing region 64, which is shown in FIGS. 9 and 10.

The closing region 64 is delimited on the side opposite the translation surface 62 in the axial direction by a V-shaped locking contact surface 68. The locking contact surface 68 and the translation surface 62 run in the rear portion of the closing portion 64 in a V-shape toward each other. The locking contact surface 68 is generally complementary to the latching tip 52 having locking side 73 of the locking lug 48th

The locking contact surface 68 merges into a locking shoulder 70 for the latching nose 48, which is located between the closing region 64 and the import / export region 60. The rear edge in the direction of rotation 66 of the locking shoulder 70 forms the front part of the locking contact surface 68. The locking shoulder 70 projects into the recess 58 in the axial direction. At its side facing away from the free edge of the cylinder receptacle 26, which corresponds to the latching nose 48 of the filter cup 14 when the liquid filter 10 is mounted, it has a rounded offset tip 72.

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

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

The pot-annular space 82 is connected via an annular space connecting lines, which are not shown for the sake of clarity in Figures 1 to 9, with an inlet-annular space 84. The inlet annular space 84 is located inside the connecting cylinder 28 and is limited by the end plate 76 and in the final assembly state of the liquid filter 10 through the bottom 56 of the cylinder receptacle 26. The inlet 20 of the filter head 18 opens into the inlet annular space 84.

At the bottom 56 of the cylinder receptacle 26 a coaxial to the rotary / thru axle 30 valve seat 86 is arranged in the form of an open at both ends hollow cylinder which surrounds a coaxial opening in the bottom 56. The valve receptacle 86 extends into the interior of the cylinder receptacle 26.

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

Between the outlet liquid opening 92 and the open end side of the valve housing 90 is located on the radially inner peripheral side of a circumferential Protrusion 94. The portion of the peripheral wall of the valve housing 90 on the side of the projection 94 opposite the outlet fluid opening 92 in the axial direction serves as a connection piece 96 for a connection piece 98 of the filter element 16 explained below. The edge of the connection piece 96 is on its free end side Chamfered on the radially inner side for ease of assembly.

A cup-shaped throttle valve piston 100 is arranged displaceably in the valve housing 90 in the axial direction. The bottom of the throttle valve piston 100 is located on the side facing the open end side of the valve housing 90. It has a passage opening 104 for the liquid. On the circumferential side, the throttle valve piston 100 has a valve fluid opening 102, which is aligned with the outlet fluid port 92 in the upper position shown in FIG. 8, in which the check / throttle valve 88 has a minimal throttling action.

A check valve piston 106 is slidably disposed in the throttle valve piston 100 in the axial direction relative to the latter. With the check valve piston 106, the passage opening 104 can be closed. On the side facing away from the passage opening 104, the check valve piston 106 has a dome, on which a coil spring 108 is attached with one end. The coil spring 108 is supported on the check valve piston 106. The opposite end of the coil spring 108 is inserted over a dome of a housing cover 1 10 of the valve housing 90 and is supported against the housing cover 1 10 from. The coil spring 108 is pressed together in the upper position of the throttle valve piston 100 and exerts a closing force on the check valve piston 106. The closing force presses the check valve piston 106 against a sealing surface surrounding the passage opening 104 at the bottom of the throttle valve piston 100, so that the passage opening 104 is closed below a certain fluid pressure on the clean side of the filter element 16.

The check valve piston 106 also has a valve piston seal 1 12. The valve piston seal 1 12 is 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 actuating element for the check / throttle valve 88. The connecting piece 98 is coaxial with the rotary / thru-axle 30. It is integrally arranged on a front side of the central tube 80 of the filter element 16 and thus connected to the filter cup 14. The connecting piece 98 protrudes through the central opening of the end plate 76 and is open to the interior 78 of the filter element 16. The edge of the free end face of the connection piece 98 is serrated.

An adjacent to the central tube 80 sealing portion 1 14 of the connecting sleeve 98 has in its radially outer peripheral side a sealing groove 1 16 with a ring seal 1 18. The outer diameter of the sealing portion 1 14 is smaller than the inner diameter of the connecting piece 96 of the valve housing 90 and greater than the inner diameter of the projection 94 of the valve housing 90th

From the central tube 80 in the axial direction behind the sealing portion 1 14 is followed by a radially outwardly extending stop step 120, an actuating portion 122 at. The outer diameter of the actuating portion 122 is smaller than the inner diameter of the projection 94 of the valve housing 90th

For mounting the liquid filter 10, the filter cup 14 is inserted from below axially to the rotary / thru-axle 30 with the connecting cylinder 28 in the direction of an arrow 124 in the cylinder receptacle 26 of the filter head 18 in a first assembly phase, as shown in Figures 1 and 2 , The conical receiving contact portion 54 of the cylinder receptacle 26 facilitates the centering of the connecting cylinder 28. It may be necessary to rotate the filter cup 14 relative to the filter head 18 slightly about the rotary / thru-axle 30 to the locking lugs 48 with the import / export areas 60 of the recesses 58 to match. In the import / export areas 60, the detents 48 are moved without resistance during further insertion. When inserting the filter cup 16 in the filter head 18 also dips the connecting piece 98 in the connecting piece 96 of the check / throttle valve 88 a. Upon further insertion of the connecting cylinder 28 in the cylinder receptacle 26 abuts in a second mounting position, which is shown in Figures 3 and 4, the free side of the leaf spring 46 against the engaging portion 44 of the connecting cylinder 28. With the leaf spring 46 is a bias in the axial direction realized between the filter head 18 and the filter cup 14.

Subsequently, the filter cup 14 is rotated relative to the filter head 18 in the closing direction of rotation 66 about the rotary / thru-axle 30. The locking lugs 48 are guided depending on the insertion depth of the translation surface 62 or on the front in the direction of rotation 66 oblique edges of the locking shoulders 70 on the Rastabsätzen 70 in the closed areas 64, which facilitates assembly.

If a wrong connecting piece 98 is used, the abutment step 120 abuts the projection 94 before the locking lugs 48 are equal to the gaps between the shoulder tips 72 and the translation surface 62, the locking paragraphs 70 can not be overcome by the locking lugs 48, so that the turn / plug connection 24 can not be activated. The locking lugs 48 reach back into the import / export areas 60 and the filter cup 14 is pressed out of the cylinder receptacle 26 by means of the bias of the leaf spring 46. In FIGS. 5 and 6, a third assembly phase is shown, in which the latching tips 52 of the latching lugs 48 and the heel tips 72 of the latching shoulders 70 lie against one another.

In the event that the latching spikes 52 have not yet overcome the shoulder tips 72 when the rotational movement acting in the closing direction of rotation 66 is prematurely adjusted, the prestressing of the leaf spring 46 causes the latching lugs 48 to follow the oblique flanks 70 of the locking shoulders 70 in the direction of closing rotation 66 and return to the import / export area 60. From there, the latching noses 48 are removed without resistance from the recess. driving / export areas 60 pressed. The filter cup 14 is thus immediately recognizable easily separated from the filter head 18.

The pointed geometries of the locking lugs 48 and the locking shoulders 70 thus prevent the latching lugs 48 from remaining on the latching shoulders 70, from where they return to the import / export areas 60 at a later time, for example even after a longer period of operation can and the connection between the filter head 18 and the filter cup 14 would be separated. If the latching tips 52 have already overcome the shoulder tips 72 during the premature adjustment of the outer rotary movement, the bias of the leaf spring 46 ensures that the latching lugs 48 are pressed into the closing areas 64 along the oblique flanks of the locking contact surfaces 68 in the closing direction 66.

In the final assembly state of the liquid filter 10 shown in FIGS. 7 and 8, the latching lugs 48 hook in the closing areas 64 in the manner of a bayonet. The latching sides 73 of the latching lugs 48 rest stably on the locking contact surfaces 68. The locking lugs 48 are then visible from the outside in the breakthrough of the closing area 64.

When properly installed filter bowl 14 using the filter element 16 with a matching connecting piece 98 abuts in the final assembly state, the jagged end face of the connecting piece 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 1 10, so that the outlet Liquid opening 92 and the valve liquid opening 102 are 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 88 can be specified for different filter elements.

When using a filter element 16 of another type, which has no or a different type of connection piece 98 which is not suitable for moving the throttle valve piston 100 toward the housing cover 110, or if the filter cup 14 is not mounted correctly, the outlet fluid port 92 and the valve fluid port 102 overlap too little or not, so that the fluid flow through the outlet 22 is throttled. This can be easily and immediately detected at the beginning of the commissioning of the liquid filter 10 at a low or even non-existent liquid flow. The check / throttle valve 88 thus combines a backstop for fluid 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 the embodiments of a liquid filter 10 described above, the following modifications are possible, inter alia:

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 bowl 14 may be mounted instead of hanging down from above or obliquely to the correspondingly oriented filter head 18.

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

The filter element 16 may instead of the zigzag-folded filter medium 74 also have a different type of formed filter medium.

The cylinder receptacle 26 and the connecting cylinder 28 may be made of a cast aluminum instead of a different material, such as another metal, a plastic or a mixed material. Instead of the connecting cylinder 28 with the locking lugs 48 and the cylinder receiving 26 with the recesses 58 and at least two different types of cooperating locking components can be provided. The connecting cylinder 28 with the locking lugs 48 may be connected to the filter head 18 instead of the filter cup 14. Accordingly, then the cylinder holder 26 is connected to the recesses 58 with the filter cup 14.

The latching lugs 48 can also be arranged in the cylinder housing 26 instead of the connecting cylinder 28. Accordingly, the recesses 58 are then mounted in the connection cylinder 28.

There may also be more or less than two detents 48 and / or more or less than two recesses 58 may 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 locking tips 52 of the locking lugs 48 and the heel tips 72 of the locking shoulders 70 may be rounded instead of edged. Instead of the leaf spring 46 and a different biasing element, such as a coil spring or an elastic element, for example made of plastic, can be used.

The connecting piece 98 can also be connected to a corresponding end disk of the filter element 16 instead of the central pipe 80.

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

Claims

claims

1 . Filter (10) for filtering in particular liquid fluids, in particular fuel or oil, in particular an internal combustion engine, and for de-airing, with a filter pot (14), in which a filter element (16) is arranged, and a filter head (18), at least an 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 cup (14) by means of a detachable bayonet-type turn / plug connection (24) are interconnected and the rotary / plug connection (24) has at least two cooperating latching components (26, 28), and one of the latching components (28) is connected to the filter cup (14) and one of the latching components (26) is connected to the filter head (18), and at least one of the latching components (28) comprises at least one latching lug (48) and one of the latching components (26) has at least one recess (58) corresponding to the latching lug (48) with an import / export area (60) for wi Resistance-free assembly and separation of latching lug (48) and recess (58) and with a closing region (64), in which the latching lug (48) hooked like a bayonet, and at least one between the filter head (18) and the filter cup ( 14) acting biasing element (46) is provided for realizing a bias of the latching lug (48) in the recess (58), characterized in that the recess (58) between the closing area (64) and the import / export area (60) a Has locking shoulder (70) for the latching lug (48), which at its with the latching lug (48) corresponding side has a heel point (72), and the latching lug (48) on its with the locking shoulder (70) corresponding side a latching tip (52 ), such that the latching nose (48) upon encountering the locking tip (42) and the heel point (72) by means of the bias of the biasing member to the locking shoulder (70) either in the closing area (64) or in the import / export area (60) slides off.

2. Filter according to claim 1, characterized in that the biasing element comprises a spring element, in particular a leaf spring (46) or a spiral spring.

3. Filter according to claim 1 or 2, characterized in that the latching lug (48) and the recess (58) in or on peripheral walls of the filter cup (14) and the filter head (18) are realized.

4. Filter according to claim 3, characterized in that the recess (58) arranged in a radially outer peripheral wall (26) and the closing region (64) is realized as a breakthrough.

5. Filter according to one of the preceding claims, characterized in that in a final assembly state of the filter (10) corresponding to each other

Pages (68, 73) of the latching nose (48) and the closing portion (64) are complementary to each other.

6. Filter according to one of the preceding claims, characterized in that the

Filter head (18) has a valve, in particular a check / throttle valve (88), in particular in the inlet (20) for the fluid and the filter cup (14) has an actuating element (98) for the valve (88).

7. Filter according to claim 6, characterized in that the actuating element to a rotary / thru-axle (30) of the rotary / plug connection (24) coaxial connecting piece (98) in particular on a central tube (80) or an end plate (76) of Filter element (16) which is connected to an inner space (78) of the filter element (16), and the valve (88) has a valve housing (90) with a to the rotary / thru axle (30) coaxial connection piece (96), the is adapted to receive the connection piece (98) for actuating the valve (88).

8. Filter according to claim 7, characterized in that an edge of a with the valve (88) corresponding end face of the connecting piece (98) is serrated.

9. 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 adapted to receive a filter element (16), and the 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 rotary / plug connection (24), the at least one latching nose (48) or one with a Locking lug 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 portion (44) for at least one between the Filter head (18) and the filter pot (14) acting biasing element (46) for realizing a bias of the detent (48) in the recess, characterized in that the recess (58) between the closing region (64) and the import / export area (60) has a locking shoulder (70 ) for the latching lug (48), which has a shoulder point (72) on its side corresponding to the latching lug (48), and the latching lug (48) has a latching tip (52) on its side corresponding to the latching shoulder (70).

10. 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 adapted to be connected by means of a detachable bayonet-type rotary / plug connection (24) to a filter cup (14) in which a filter element (16) can be arranged , and the at least one latching lug or at least one recess (58) corresponding to a latching nose (48) of the filter cup (14) with an import / export area (60) for the resistance-free assembly and separation of latching lug (48) and recess (58) and with a closing portion (64) in which the latching nose (48) hooked like a bayonet, and the one engaging portion (56) for at least one between the filter head (18) and the filter pot (14) acting biasing element (46) for realizing a bias of the detent (48) in the recess (58), characterized in that the recess (58) between the closing area (64) and the import / export area (60) a latching shoulder (70) for the latching lug (48) which has a shoulder point (72) on its side corresponding to the latching lug (48), and the latching lug (48) has a latching point (8) on its side corresponding to the latching shoulder (70) ( 52).