WO2016001062A1

WO2016001062A1 - Filter device

Info

Publication number: WO2016001062A1
Application number: PCT/EP2015/064405
Authority: WO
Inventors: Claude Frédéric Gebler; Markus PREIßINGER; Valentin Ruffet; Markus Lang
Original assignee: Mahle International Gmbh
Priority date: 2014-07-03
Filing date: 2015-06-25
Publication date: 2016-01-07
Also published as: DE102014212923A1

Abstract

The invention relates to a filter device (1) comprising a first filter housing part (2) having an outer thread (3) and a second filter housing part (4) which can be screwed thereto having an inner thread (5). According to the invention, – a U-shaped spring clip (7) is provided which is arranged in the first filter housing part (2) and has outwardly angled continuations (9) at the free ends of the U-legs (8) thereof; in the case of a ring filter element (6) not being inserted, the continuations project radially past an edge of the first filter housing part (2) and by this means prevent screwing to the second filter housing part (4), – the spring clip (7) has a center area (10) which interacts with an end disc (13) of the ring filter element (6) in such a way that the two U-legs (8) are drawn together when a ring filter element (6) is inserted, and by this means screwing to the second filter housing part (4) is enabled.

Description

Filtereinnchtung

The present invention relates to a filter device having a first filter part having an external thread and a second filter housing which can be screwed therewith and has an internal thread, according to the preamble of claim 1. The invention also relates to a ring filter element with two end disks.

From WO 2013/124824 A1 a generic filter device with a hanging ring filter element is known, in which case a fuse is provided, which ensures that only a specially authorized filter element is inserted into the filter housing. The fuse comprises a spring-biased pin in the filter head, which is pressed by a slope on an end plate of the ring filter element against a spring and allows a Verbau. A disadvantage of this embodiment, however, is that it is relatively expensive and suitable only for hanging filter, since the ring filter element is inserted into the ring filter cartridge.

From WO 2007/009533 A1 a further filter device according to the preamble of claim 1 is known.

From DE 197 07 132 A1 a filter device with a filter housing is known which consists of at least two filter housing parts. A ring filter element is secured in the filter housing, wherein at least one locking means is provided, by means of which a releasable latching connection between the ring filter element and at least one of the filter housing parts can be produced. In particular, this should make it possible to mount or supply ring filter elements Dismantle with always safe operation, without coming into direct contact with the ring filter element.

The present invention addresses the problem of providing an improved embodiment for a filter device of the generic type, which ensures the use of authorized ring filter elements, at the same time is inexpensive and can be used for both hanging and standing filter elements.

This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea of providing a U-shaped spring clip in a filter device known per se with a first filter housing part having an external thread and a second filter housing part which can be screwed thereon and internally threaded, which screw together the two filter housing parts without previously inserted and Authorized ring filter element prevented. The two filter housing parts form in the screwed together state, the filter housing in which the ring filter element is arranged. The U-shaped spring clip according to the invention is arranged in the first spring housing part and has at the free ends of its U-leg outwardly bent projections which protrude radially at not inserted ring filter element over the first filter housing part and thereby prevent screwing with the second filter housing part by they prevent a threaded engagement of the external thread of the first filter housing part in the internal thread of the second filter housing part. The spring clip according to the invention furthermore has a central region which interacts with an end disk of the ring filter element in such a way that when the ring filter element set ring filter element, the two U-legs are pulled together and thereby pull the outwardly bent projections inward, whereby a screwing of the two filter housing parts is allowed together, since now the extensions no longer prevent the engagement of the two threads into each other. The U-shaped spring clip according to the invention is not only structurally extremely easy to manufacture, but also cost, whereby this security feature is easy and cheap to manufacture. The U-shaped spring clip according to the invention is preferably integrated in the first filter housing part, in particular in a filter housing cover, and acts in non-inserted ring filter element by means of projections projecting radially beyond the end of the first housing part blocking for an assembly of the two filter housing parts. If a suitable, that is authorized, ring filter element is used, the spring clip is stretched and over the first housing part radially projecting extensions are "pulled" to the ring filter element and thereby release the thread of the second filter housing part for assembly.

In an advantageous development of the solution according to the invention, the spring clip is made of metal, in particular as a stamped sheet metal part, or of plastic. Both embodiments allow both a manufacturing technology simple and a cost-effective production of the spring clip according to the invention, in particular, the execution of metal no further protective considerations in terms of, for example, in the filter device flowing aggressive media, such as fuel or oil needs.

Suitably, the spring clip is clipped to the first filter housing part. In order to connect the spring clip on the one hand simple, but on the other hand also permanently with the first filter housing part, preferably a clip connection can be provided, which in particular the assembly of the spring clip in first filter housing part made extremely simple. In the most favorable case, the spring clip only has to be pressed into the first filter housing part until it latches there, that is until, for example, latching hooks arranged on the first filter housing part engage behind the spring clip and thereby fix it. Of course, the spring clip according to the invention can also be fixed in any other way, for example by screwing, welding or gluing, on the first filter housing part.

In a further advantageous embodiment of the solution according to the invention, the spring clip in its central region has a conical nose, which faces the ring filter element or its end plate and which cooperates with a conical receptacle on the end plate of the ring filter element. If the ring filter element is slipped onto the conical nose of the spring clip, the nose enters the conical seat on the end plate and is compressed, since the conical seat has steeper flanks than the conical nose. By squeezing the two U-legs are used and thus the extensions adjusted radially inward, at least to the extent that they no longer engage in the internal thread of the second housing part and thereby prevent screwing of the two housing parts. As an alternative to the conical design of the receptacle, this can of course also be cylindrical, in which case a clear inner diameter of the cylindrical receptacle is smaller than a width of the nose, so as to be able to reliably effect the compression of the legs.

Suitably, the particular conical receptacle is arranged axially centrally of the end plate of the ring filter element projecting and integrally formed therewith. In order to be able to produce the receptacle with high quality but at the same time cost-effectively, it is advantageous to produce it together with the end disk, for example in a common plastic injection molding process. to deliver. All you have to do is change the plastic injection mold once.

In a further advantageous embodiment of the solution according to the invention, the spring clip at its U-legs in each case an inwardly directed nose, engage behind in the first filter housing part used ring filter element the end plate and lock it. By the tension of the spring clip when inserting the ring filter element thus locks the ring filter element on the spring clip and thereby prevents the ring filter element from falling out of the first filter housing part. In order to release the ring filter element from the first filter housing part, this can be pressed together with the ring filter element at an angle to a plate. By a relative movement between the ring filter element, spring clip and the first filter housing part, the end disk of the ring filter element slides on one side under the inwardly directed nose of the spring clip, whereupon the ring filter element readily falls out of the first filter housing part.

Of course, the filter device can generally be formed as a fluid filter device and thereby either gases or liquids, for example oil or the fuel, filter.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention. Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Show, in each case schematically,

1 is a sectional view through a filter device according to the invention with not inserted ring filter element and thereby locking spring clip,

2 is an illustration as in Fig. 1, but with inserted ring filter element and thereby unlocked spring clip,

3 is a view of a spring clip according to the invention,

Fig. 4 is a view of a ring filter element with inserted spring clip

Fig. 5 is a sectional view through the filter device according to the invention with locking and unlocking spring clip.

According to FIGS. 1, 2 and 5, a filter device 1 according to the invention has a first filter housing part 2, for example a filter housing cover, with an external thread 3, which can be screwed to a second housing part 4 via an internal thread 5. In the filter housing formed from the first and second filter housing part 2, 4 according to Figures 2 and 5, a ring filter element 6 is installed. According to the invention, a U-shaped spring clip 7 (see also FIGS. 3 and 4) is provided, which is connected in the first filter housing part 2. is ordered and has at the free ends of its U-leg 8 outwardly bent projections 9 which protrude radially with the ring filter element 6 is not inserted radially over the first filter housing part 2 and thereby prevent screwing with the second filter housing part 4 (see Figures 2 and 5). , In addition, the spring clip 7 according to the invention has a central region 10 which cooperates with an end plate 13 of the ring filter element 6 such that when inserted ring filter element 6, the two U-legs 8 are contracted and thereby pull the outwardly bent projections 9 inward and screwing the allow both filter housing parts 2 and 4 with each other. The spring clip 7 according to the invention is preferably made of metal, in particular as a cost-effective and manufactured easily manufactured sheet metal stamping part, or made of plastic. Both selected embodiments allow a much cheaper compared to previously known from the prior art solutions. As can be seen in particular Figures 1, 2 and 5, while the spring clip 7 is clipped to the first filter housing part 2 via a clip connection 1 1. For this purpose, the clip connection 1 1, for example, latching hooks 14, which engage behind the spring clip 7 after pressing in the first filter housing part 2 and thereby fix. The clip connection 1 1 or the latching hooks 14 can be produced in one piece with the first filter housing part 1, for example in a common plastic injection molding process. Of course, it is also conceivable that the U-shaped spring clip 7 is connected in another way, for example by screwing, gluing, welding or caulking with the first filter housing part 2.

Looking in particular to Figure 3, it can be seen that the spring clip 7 in its central region 10 has a conical nose 12 which cooperates with a conical receptacle 15 on the end plate 13 of the ring filter element 6. The taper of the flanks 23 of the receptacle 15 is usually example, at least slightly steeper than the taper of the flanks 24 of the nose 12, whereby the clamping of the U-shaped spring clip 7 according to the invention takes place upon depression of the nose 12 in the end-plate-side receptacle 15, whereupon this pulls its two U-legs 8 together. The conical seat 15 is arranged axially centrally of the end plate 13 of the ring filter element 6 projecting and preferably integrally formed therewith, so that the end plate 13 together with receptacle 15 can be preferably prepared in a common plastic injection molding process. Theoretically, the flanks 23 of the receptacle 15 can also run parallel to the axis 25, so that the conical receptacle 15 would be cylindrical in this case. In order to be able to bring about the pressing back of the extensions 9, a clear inner diameter d of the receptacle 15 must be smaller than a width b of the nose 12 of the spring clip. 7

Looking further at the spring clip 7, it can be seen that this has at its U-legs 8 each have an inwardly directed lug 16 which engage behind in the fixedly inserted in the filter housing part 2 ring filter element 6 the end plate 13 thereof and lock it. As a result, the ring filter element 6 can be securely held in the first filter housing part 2. If you want to solve the ring filter element 6 after unscrewing the second filter housing part 4 from the first filter housing part 2, so it is simply pressed obliquely against a pad until the relative movement between the ring filter element 6, spring clip 7 and the first filter housing part 2, the end plate 13 of the ring filter element 6 one side slips under the inwardly projecting nose 16 of the spring clip 7 and thereby fall out of the ring filter element 6 without further notice. Furthermore, the spring clip 7 can each have on its U-legs 8 an outwardly directed lug 17 which, when the ring filter element 6 is not inserted, has a stop for the U-legs 8 on the first filter element. form housing part 2 and thereby limit the radial adjustment movement of the extensions 9.

In Fig. 5 both states of the spring clip 7 are shown in one and the same figure, i. both with inserted ring filter element 6 and without this. The state without inserted ring filter element 6 is characterized by the reference numeral 18, whereas the state with inserted ring filter element 6 is designated by the reference numeral 19. In state 19, it can be clearly seen that the extensions 9 are set back inwards to such an extent that they no longer block the internal thread 5 of the second filter housing part 4, thereby allowing the two filter housing parts 2, 4 to be screwed together. In state 18, i. without inserted ring filter element 6, this is not possible because the extensions 9 of the two U-legs 8 protrude radially beyond the first filter housing part 2 and thus prevent screwing.

With the U-shaped spring clip 7 according to the invention, an extremely simple and cost-effective possibility can be provided in comparison with the prior art to ensure that a ring filter element 6 is always used when the filter housing is closed and, moreover, it can be ensured that only an authorized ring filter element 6 is used is, namely one with a matching conical receptacle 15 at the end plate 13. In contrast to known from the prior art ring filter elements, the end plate 13 is closed, that is impermeable formed in the ring filter element 6 according to the invention. The end plate 13 has here solely and solely the task to operate the spring clip 7 and the extensions 9 to draw inward so far that they no longer block the internal thread 5 of the second filter housing part 4, thereby allowing a screwing of the two filter housing parts 2, 4. The receptacle 15 is designed conical so that it allows a rotation of the ring filter element 6 relative to the spring clip 7. Such twisting is not hindered by the inwardly directed lugs 16, which engage behind the end plate 13 and engage with it. This is particularly important if at the end plate 13 opposite end plate 20, an axially projecting pin 21 is arranged to engage with mounted filter device 1 in an associated (not shown) idle channel and close it. The end plate 20 is annular and thus has in contrast to the end plate 13 has a central opening 22nd

In order to effect a reliable compression of the flanks 24 of the nose 12 through which the flanks 23 of the conical receptacle 15 and thereby enable a reliable screwing of the two of the two filter housing parts 2, 4, the receptacle 15 and the nose 12 in the manner of a so-called Key lock principle trained.

Looking at the nose 12 of the spring clip according to FIG. 3, it can be seen that the flanks 24 are inclined at an angle α to the axis 25, this angle α in a range between 15 ° <α <25 °, preferably at about 15 °, lies. The flanks 23 of the receptacle 15 are inclined at an angle ß to the axis 25, wherein it is true that ß <a, in particular ß ß about 10 °. Regardless of the angle ß the compression of the legs 8 can also be achieved by the clear inner diameter d of the receptacle 15 is smaller than the width b of the nose 12. In theory, the flanks 23 of the receptacle 15 can also be parallel to the axis 25, so that the receptacle 15 in this special case would no longer be conical but cylindrical. In order then to be able to bring about the pushing back of the projections 9, the clear inner diameter d of the receptacle 15 must be smaller than the width b of the nose 12 of the spring clip. 7 In order to be able to receive the nose 12 completely in the receptacle 15, an axial height h _{A of} the receptacle 15 can also be greater than an axial height h _{N of} the nose 12 (compare FIGS. 3 and 4).

Claims

claims

1 . Filter device (1) having a first filter housing part (2) having an external thread (3) and a second filter housing part (4) which can be screwed thereto and has an internal thread (5), which together form a filter housing in which a ring filter element (6) is arranged,

characterized,

a U-shaped spring clip (7) is provided, which is arranged in the first filter housing part (2) and has at the free ends of its U-legs (8) outwardly bent extensions (9) which are not inserted when the ring filter element (9). protrude radially beyond an edge of the first filter housing part (2) and thereby prevent screwing with the second filter housing part (4),

in that the spring clip (7) has a central region (10) which cooperates with an end disk (13) of the ring filter element (6) such that when the ring filter element (6) is inserted, the two U-legs (8) are pulled together and thereby outwardly pull bent projections (9) inwards and allow screwing with the second filter housing part (4).

2. Filter device according to claim 1,

characterized,

that the spring clip (7) is made of metal, in particular as a sheet metal stamped part, or of plastic.

3. Filter device according to claim 1 or 2,

characterized,

that the spring clip (7) with the first filter housing part (2) is clipped.

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

in that the spring clip (7) has in its middle region (10) a conical nose (12) which cooperates with a particularly conical receptacle (15) on the end plate (13) of the ring filter element (6).

5. Filter device according to claim 4,

characterized,

in that the in particular conical seat (15) projects axially centrally from the end disk (13) of the ring filter element (6) and is formed integrally therewith.

6. Filter device according to one of the preceding claims,

characterized,

in that the spring clip (7) in each case has an inwardly directed lug (16) on its U-legs (8), which engages behind the end plate (13) of the same in the first filter housing part (2) inserted ring filter element (6) and lock it.

7. Filter device according to one of the preceding claims,

characterized,

that the spring clip (7) at its U-legs (8) each have an outwardly directed nose (17), which not inserted ring filter element (6) form a stop for the U-legs (8) on the first filter housing part (2) and thereby limiting the radial adjustment movement of the extensions (9).

8. Filter device according to one of the preceding claims,

characterized, in that the first filter housing part (2) is designed as a filter housing cover and the second filter housing part (4) as a filter housing pot.

9. Filter device according to one of the preceding claims,

characterized,

the filter device (1) is designed as a lubricating oil filter or as a fuel filter.

10. ring filter element for a filter device according to one of the preceding claims, with two end plates, wherein at least one end plate (13) a particular conical receptacle (15) axially centrally projecting from this and is formed integrally therewith and wherein the end plate (13) is closed is.

1 1. Ring filter element according to claim 10,

characterized,

in that the receptacle (15) has conical flanks (23) which are inclined at an angle β of 10 ° <β <20 ° with respect to an axis (25) of the ring filter element (6).