EP3897910A1

EP3897910A1 - Oil filter for a motor vehicle and filter cartridge for an oil filter

Info

Publication number: EP3897910A1
Application number: EP19798285.3A
Authority: EP
Inventors: Markus Sander; Lionel Le Clech; Eric Schumacher
Original assignee: Daimler AG
Current assignee: Daimler Truck Holding AG
Priority date: 2018-12-17
Filing date: 2019-11-05
Publication date: 2021-10-27
Also published as: CN113195075A; DE102018009928A1; WO2020126186A1; US20220018271A1; CN113195075B; KR20210087534A; JP7227379B2; JP2022514301A; BR112021010705A8; US11530632B2; BR112021010705A2

Abstract

The invention relates to a filter cartridge (12) and to an oil filter (10) having a filter cartridge (12) which is arranged in an oil filter housing (14) of the oil filter (10). A piston (36) of the filter cartridge (12) comprises a duct (20) for filtered oil and a filter material (12) arranged between two end plates (30, 40) of the piston (36). The piston (36) is displaceable in the closed oil filter housing (14), in an axial direction (38) of the filter cartridge (12), in order to prevent ingress of filtered oil, via through-openings (32) formed in an outlet port (28) of the piston (36), into a duct (34) of the oil filter housing (14) when the piston (36) is in a closure position, and to permit this in an open position. The filter cartridge (12) has a closure element (54) for closing an outlet duct (56), said closure element (54) being held on at least one brace (64) of the filter cartridge (12), wherein the free end of the at least one brace (64) can be supported in the closed oil filter housing (14). The piston (36) is displaceable relative to the at least one brace (64).

Description

Oil filter for a motor vehicle and filter cartridge for an oil filter

The invention relates to an oil filter for a motor vehicle, with a filter cartridge which is arranged in an oil filter housing of the oil filter. The oil filter housing comprises a base body and a cover element. A piston of the filter cartridge includes a channel for filtered oil, which is at least partially surrounded in the radial direction by a filter material of the filter cartridge, and an outlet connection. The filter material is arranged between a first end plate and a second end plate of the piston. The piston is in the closed

Oil filter housing displaceable in an axial direction of the filter cartridge, in order to prevent filtered oil from entering through a through opening formed in the outlet connection into a side of the piston in a closed position of the piston

To prevent oil filter housing provided channel for supplying the internal combustion engine with lubricant, and to allow entry in an open position of the piston. In the open position, the piston is spaced further from the cover element in relation to the closed position than in the closed position. The

Filter cartridge has a closure element, by means of which an outlet channel can be closed. The drain channel is designed to drain oil from a receiving area of the oil filter housing in which the filter cartridge is arranged. Furthermore, the invention relates to a filter cartridge for such an oil filter.

Such an oil filter is described in WO 2017/088962 A1. The filter cartridge is floating in the closed oil filter housing. If an internal combustion engine of the motor vehicle having the oil filter is not in operation and thus no oil flows through the filter material of the filter cartridge, the filter cartridge is in the closed position. From filtered through openings formed in an outlet connection of the channel of the filter cartridge, no filtered oil can then enter the channel provided on the side of the oil filter housing for supplying the Enter internal combustion engine with lubricant. If the internal combustion engine is switched on, the filter cartridge is moved to the open position. Here, the outlet connection of the channel of the filter cartridge presses a hood-shaped one

Closure device against the force of a return valve spring away from a tubular receptacle of the base body of the oil filter housing. The outlet connector protrudes into this tubular receptacle. By pushing the

Locking device from its seat on the receptacle can be used in the

Outlet openings formed through the filtered oil enter the channel provided on the side of the oil filter housing. When the filter material is added, the filter cartridge is shifted further into a bypass position, the tubular receptacle being moved away from its seat on a wall against the force of a bypass valve spring. Then the unfiltered oil can get into the channel provided on the side of the oil filter housing.

In the oil filter of WO 2017/088962 A1, the closure element is on the

Filter cartridge is designed as a sleeve which can be displaced relative to the end plates and which is pressed by means of a third spring or service valve spring against an inlet of the drain channel. In the event of servicing, the oil can be drained from the for the

Filter cartridge provided receiving area of the oil filter housing can be drained. By means of the force of the third spring against the inlet of the

Drainage channel pressed sleeve element is thus provided the function of a service valve for the oil filter.

The third spring or compensating spring is dimensioned such that when the oil filter housing is closed, the drain channel is closed in every position of the filter cartridge. The compensating spring must therefore compensate for the stroke or the displacement movement of the filter cartridge and one on the sleeve

Always press the arranged sealing element against the drain on the bottom of the filter bowl or oil filter housing.

If this third spring or compensating spring is made of metal, the filter cartridge cannot be completely disposed of by burning

Reach combustion of the filter cartridge. The filter cartridge is therefore not fully incinerable.

In addition, the force of the third spring or compensating spring or service valve spring must be in addition to the force of the check valve spring and Bypass valve spring can be overcome if the filter cartridge is to be moved to the open position or to the bypass position. To compensate for tolerances, it must also be ensured in the closed position of the filter cartridge that the third spring is compressed at least to such an extent that the closure element holds the

Drain channel closed when the oil filter housing is closed. The fact that

Moving the filter cartridge into the open position and into the bypass position always has to overcome the force of the third spring or service valve spring, moving the filter cartridge in the closed oil filter housing is associated with a higher pressure loss than without the provision of the third spring

or compensation spring would be the case.

Furthermore, a comparatively large amount of installation space must be provided for the sleeve element and the third spring, in addition to the installation space provided for the stroke of the filter cartridge. This means that the available filter area of the filter material is smaller than without the provision of the compensating spring and the sleeve or than would be the case with a filter cartridge immovably arranged in the oil filter housing.

The object of the present invention is to provide an oil filter and a filter cartridge of the type mentioned at the outset with a simplified structure.

This object is achieved by an oil filter with the features of claim 1 and by a filter cartridge with the features of claim 3. Advantageous refinements with expedient developments of the invention are specified in the dependent claims.

The oil filter according to the invention for a motor vehicle comprises a filter cartridge which is arranged in an oil filter housing of the oil filter. The oil filter housing comprises a base body and a cover element. A piston of the filter cartridge includes a channel for filtered oil and an outlet port. The channel of the piston is radial

Direction at least partially surrounded by a filter material of the filter cartridge. The filter material is arranged between a first end plate and a second end plate of the piston. The piston is in the closed

To prevent the oil filter housing provided channel. Furthermore, the piston is in the closed oil filter housing is displaceable in the axial direction of the filter cartridge in order to allow the oil to enter the channel provided on the side of the oil filter housing in an open position of the piston. In the open position of the piston, the piston is farther from that in relation to the closed position

Cover element spaced apart than in the closed position. The filter cartridge has a closure element, by means of which an outlet channel can be closed. Of the

Drain channel is designed to drain oil from a receiving area of the oil filter housing. The filter cartridge is arranged in the receiving area. The

The closure element is held on at least one strut of the filter cartridge, the free end of the strut being supported in the closed oil filter housing. The piston is relative to the at least one strut in the axial direction of the

Movable filter cartridge. By supporting the at least one strut in the oil filter housing, it is possible to use the at least one strut

To press the closure element against an inlet of the drain channel such that the drain channel is always closed when the oil filter housing is closed. It is therefore not necessary to provide a spring on the filter cartridge in order to close the drain channel by means of the closure element. Accordingly, the structure of the oil filter and in particular the filter cartridge is simplified.

The closed position of the piston is a position of the piston of the filter cartridge which the piston takes up in the closed oil filter housing when an internal combustion engine of the motor vehicle having the oil filter is switched off. The closed position of the piston can thus also be referred to as the engine off position.

In contrast, the open position of the piston is a position of the piston in which a check valve on the side of the oil filter housing is pressed or opened by means of the outlet connection of the filter cartridge. In operation of the oil filter, this is brought about by an oil pump of the one having the oil filter

Motor vehicle oil through the oil filter housing, which is preferably cleaned by means of the filter material of the filter cartridge. Since the oil pump is usually driven by the running internal combustion engine of the motor vehicle, the open position of the piston can also be referred to as the engine on position.

The displacement of the piston from the closed position into the open position is brought about by the pressure conditions prevailing in the oil filter housing, which occur when the oil delivered by the oil pump, the oil filter housing and the flows through the oil filter housing arranged filter cartridge. The piston of the

The filter cartridge is thus floating in the closed oil filter housing. And the piston is due to the oil pump set in operation

Pressure ratios in the closed oil filter housing shifted from the closed position relative to the at least one strut into the open position. The drain channel provided on the side of the oil filter housing is closed

Oil filter housing is always closed by the closure element held on the at least one strut of the filter cartridge, which is supported by means of the strut against the oil filter housing.

The filter cartridge has fewer parts than is the case when the third spring or service valve spring is provided, which is the case with the oil filter

WO 2017/088962 A1 presses the sleeve against the inlet of the drain channel. By eliminating such a spring, the pressure loss of the filter cartridge during operation of the oil filter is also reduced. Because to move the piston of the filter cartridge it is no longer necessary to overcome the force exerted by the service valve spring. The lower pressure loss during operation of the oil filter or the filter cartridge goes with a reduced fuel consumption of the oil filter

Motor vehicle in ferry operation.

Furthermore, the at least one strut can be made from a combustible material, for example from a plastic material. In this way it is possible to dispose of the filter cartridge by completely burning it, ie by completely converting it to ashes. The filter cartridge can thus be provided as a completely incinerable component with particularly little effort.

In addition, it can be achieved that when the piston is displaced in the axial direction of the filter cartridge, abrasion which may occur due to wear occurs on the dirty side of the filter cartridge, that is to say on the side of the oil to be filtered. In addition, because of the provision of the at least one strut, instead of the sleeve which can be displaced by means of the service valve spring, an enlarged filter area can be provided for the filter material of the filter cartridge, since there is no need to keep clear the stroke path of the sleeve relative to the piston of the filter cartridge.

The piston of the filter cartridge, which comprises the filter material arranged between the first end plate and the second end plate, is movable relative to the at least one strut. Despite the displaceability of the piston, the filter cartridge even provided the closure element, which includes the service valve function of the filter cartridge. The closure element is held in position in a sealing manner against the drain channel by means of the at least one strut, which can be supported in the closed oil filter housing.

It is particularly advantageous here that the third spring described in WO 2017/088962 A1, or also the compensating spring or service valve spring on the exchangeable component in the form of the filter cartridge, can be dispensed with completely.

The free end of the at least one strut is preferably supported in the closed oil filter housing on the cover element of the oil filter housing. Thus, when the cover element is fixed to the base body of the oil filter housing, it can be ensured in a simple manner that the closure element against the

Drain channel is pressed or the drain channel by means of the

Closure element is closed. Furthermore, supporting the free end of the at least one strut on the cover element also allows the filter cartridge to be removed easily in the event of servicing, since when the cover element is removed, the filter cartridge is readily removed from the receiving area in the base body of the

Oil filter housing is removable.

The filter cartridge according to the invention for an oil filter of a motor vehicle can be arranged in an oil filter housing of the oil filter comprising a base body and a cover element. A piston of the filter cartridge includes a channel for filtered oil and an outlet port. The channel for the filtered oil is surrounded in the radial direction at least in regions by a filter material of the filter cartridge. The filter material is arranged between a first end plate and a second end plate of the piston. The piston is displaceable in the closed oil filter housing in an axial direction of the filter cartridge in order to prevent an entry of filtered oil into a channel provided on the side of the oil filter housing in a closed position of the piston via at least one passage opening formed in the outlet port. Furthermore, the piston in the closed oil filter housing is displaceable in the axial direction of the filter cartridge in order to be in an open position of the

Piston, in which the piston is spaced further from the cover element with respect to the closed position than in the closed position, to allow the oil to enter the channel provided on the side of the oil filter housing. The filter cartridge has a closure element, by means of which an outlet channel can be closed. The drain channel is for draining oil from a receiving area of the oil filter housing formed, the receiving area for receiving the filter cartridge

is provided. The closure element is on at least one strut

Filter cartridge held, the free end of the at least one strut can be supported in the closed oil filter housing. The piston is displaceable relative to the at least one strut in the axial direction of the filter cartridge.

Such a filter cartridge has a particularly simple structure and ensures by means of the at least one strut and in the

closed oil filter housing supported closure element the function of a service valve. The present design eliminates the need for a metallic service valve spring. Through the at least one strut which can be supported in the oil filter housing and is connected to the closure element, the closure element, when the

Filter cartridge is built into the oil filter housing, reliably pressed against the drain channel.

The free end of the at least one strut can preferably be supported in the closed oil filter housing on the cover element of the oil filter housing. A

Supporting the free end of the at least one strut on the cover element allows, in particular, easy removal of the filter cartridge in the event of service, since after removal of the cover element from the base body of the oil filter housing

Filter cartridge can be easily removed from the receiving area of the oil filter housing.

It has proven to be advantageous if the at least one strut is designed as a guide element for guiding the piston of the filter cartridge when the piston is displaced relative to the at least one strut. As a result, the functionality of the at least one strut is increased and a process-reliable displacement of the piston of the filter cartridge in the closed oil filter housing can also be achieved.

For example, the at least one strut can be guided in grooves which are formed in at least one of the end plates, or extensions formed on the at least one end plate can engage in grooves which are formed in the at least one strut.

A particularly reliable guidance of the piston can be achieved, however, if a through opening is formed in at least one of the end plates, through which the at least one strut is passed through. The at least one strut is then guided in a type of eyelet which is formed in the at least one end plate.

The passage opening can be formed in a tab which projects in the radial direction over an edge of the at least one end plate. This ensures that the at least one strut extends outside the filter material of the filter cartridge. As a result, the passage of oil to be filtered from the outside through the filter material into the channel of the filter cartridge is particularly little impaired. In addition, a very reliable guidance of the piston relative to the at least one strut can be achieved in this way.

It has proven to be further advantageous if the at least one strut has at least one guide region, along which a respective end plate is attached

The piston can be displaced, the guide region being oriented essentially parallel to the axial direction of the filter cartridge. The at least one straight guide area allows the piston of the filter cartridge to be guided smoothly and smoothly.

In particular, the at least one strut can be guided in the at least one guide region through the passage opening which is formed in at least one of the end plates of the filter cartridge. If the at least one strut is guided in respective guide areas through respective passage openings which are formed in the first end plate and the second end plate, then a particularly precise guidance of the filter area can be ensured.

In an advantageous development, the at least one strut has a further length area between a first guide area formed in the area of the first end plate and a second guide area formed in the area of the second end plate. In the further length range, the at least one strut is designed in the shape of an arc. In this way, manufacturing tolerances of the oil filter housing and / or the filter cartridge can be compensated for and furthermore it can be ensured that the closure element always closes the drain channel when the oil filter housing is closed. The arch shape of the at least one strut allows any tolerances of the oil filter housing and / or filter cartridge to be compensated in a simple manner, so that when the oil filter housing is closed, the closure element is reliably subjected to a pressure which seals the drain channel. The at least one strut is preferably curved outward in the radial direction in the further length range. This ensures on the one hand that the at least one strut does not press against the filter material of the filter cartridge. If the at least one strut is curved outwards in the radial direction in the further length range, the filter material can flow freely through the oil to be filtered in the radial direction from the outside inwards. The at least one arcuate strut also counteracts a collapse of the filter material. If, in addition, in the presence of several struts, these in the further

If the length range comes into contact with the oil filter housing, the installation position of the filter cartridge in the oil filter housing can be defined particularly well.

In addition or as an alternative to an arcuate configuration of the at least one strut, the at least one strut can have at least one spring region, in which it acts as a result of an action in the axial direction of the filter cartridge

Force application is compressible. Such a spring area also compensates for tolerances, in particular manufacturing tolerances, of the oil filter housing and / or the filter cartridge. Because by providing the spring area in which a height extension of the at least one strut can be reduced, the closure element in the closed oil filter housing is always pressed against an inlet of the drain channel, even if there are tolerances in the oil filter housing and / or the filter cartridge.

The tolerance compensation, which can preferably be achieved by the arcuate configuration of the at least one strut and / or by the provision of the spring area, serves in particular to compensate for deviations of an actual distance between the cover element and the drainage channel from a desired distance of this area. and / or different lengths in the axial direction

To compensate for the filter cartridge, which can be caused, for example, by production and / or by slightly different installation positions of the filter cartridge.

The at least one strut can advantageously have at least two legs arranged in a V-shape with respect to one another in the at least one spring region. Ends of the legs spaced apart from one another can be moved towards one another as a result of the application of force. Such a defined kink area, which encompasses the at least two legs, makes it very simple and reliable provide a spring area for compressing the vertical extent of the at least one strut.

The at least one spring region is preferably formed in a section of the at least one strut in which this strut projects beyond that of the two end plates which is closer to the closure element. Because here it is easier with regard to the installation space to provide the spring area.

The end plate of the two closer to the closure element preferably has

End plates, encircling the outlet of the channel of the filter cartridge, an indentation. Here, an inner wall of the indentation is formed by the outlet nozzle, and a filter material area of the filter material overlaps with an outer wall of the indentation in the axial direction of the filter cartridge. Such an indentation or an inversion designed in the manner of a groove in the region of the end plate closer to the closure element makes it possible to provide a particularly large filter area of the filter material while at the same time realizing a displacement path of the floating filter cartridge that is necessary for the opening of the check valve or the opening of the bypass valve , space available for the filter cartridge in the oil filter housing. Reliable central guidance of the filter cartridge by means of a sufficient overlap of the outlet connection of the filter cartridge with the tubular receptacle on the side of the oil filter housing also remains guaranteed.

It is also advantageous if the at least one strut has in one end region at least one stop element which engages behind the end plate of the two end plates which is further away from the closure element. Such a stop element provides a stop for the sliding movement of the piston of the filter cartridge relative to the at least one strut. In addition, the at least one strut is thus arranged in a defined position with respect to the end plate further away from the closure element. The stop element can be designed as a spring tongue or similar locking element.

The filter cartridge preferably has a plurality of struts, which in

Circumferential direction of the end plates are spaced apart. In particular, the struts can be evenly spaced apart from one another in the circumferential direction. On the one hand, homogeneous support of the closure element can be achieved by means of the struts, which reliably closes the drain channel. On the other hand, improved guidance of the piston of the filter cartridge when the piston is displaced relative to the struts can be achieved.

In particular, the struts can have a rectangular shape in cross section, at least in regions. Such struts designed in the manner of narrow slats are on the one hand particularly robust, on the other hand it is possible to arrange such struts on the filter cartridge in such a way that they advantageously require little installation space in the radial direction. Furthermore, due to the cross-sectionally rectangular shape of the struts, the broad side of which faces the filter material of the filter cartridge, a direction can be predefined in which the strut should bend when a force acting in the axial direction of the filter cartridge is applied. In this way it can be ensured, for example, that the struts are in such a position

Move the force application away from the filter material. In this way, contact of the struts with the filter material is prevented and it becomes a good one

Flow through the filter material ensured.

The advantages and preferred embodiments described for the oil filter according to the invention also apply to the filter cartridge according to the invention and vice versa.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawings. The features mentioned in the description and

Characteristic combinations as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively specified combination but also in others

Combinations or used alone without leaving the scope of the invention.

Show:

Fig. 1 in a sectional perspective view of an oil filter for a

Motor vehicle, a filter cartridge being installed in an oil filter housing of the oil filter;

Fig. 2 in a perspective view of a variant of the cut in Fig. 1

filter cartridge shown; Fig. 3 in a perspective view that filter cartridge, which in the

Oil filter housing of the oil filter according to FIG. 1 is installed;

4 shows a detail and perspective of an end region of the filter cartridge according to FIG. 3;

Fig. 5 detail and perspective the other end of the

Filter cartridge according to FIG. 3;

FIG. 6 shows the filter cartridge according to FIG. 3 in a further cut

Perspective view; and

7 shows the lower end region of the filter cartridge according to FIG. 3 in a

cut perspective view.

An oil filter 10 for a motor vehicle is shown in a sectional perspective view in FIG. 1, which can be, in particular, a commercial vehicle. A filter cartridge 12 of the oil filter 10 is also shown partially in section in FIG. 1. The oil filter 10 comprises an oil filter housing 14, which comprises a base body 16 and a cover 18, or a cover element. In order to change the filter cartridge 12, the cover 18 is removed from the base body 16, for example unscrewed. In Fig. 1 the oil filter housing 14 is shown closed. The cover 18 with the filter cartridge 12 held on the cover 18 is therefore screwed into the base body 16.

The filter cartridge 12 has a piston 36 with a channel 20. The channel 20 is surrounded in the radial direction by a filter material 22. The filter material 22 can be designed, for example, as a pleated filter. The channel 20 includes a central support tube 24 in which a plurality of passages 26 are formed. The oil filtered by means of the filter material 22 can reach the channel 20 via these passages 26. The unfiltered oil, which is located in the oil filter housing 14, therefore passes through the filter material 22 in the radial direction from the outside and thus reaches the channel 20, which is formed in the piston 36.

At an end of the filter cartridge 12 opposite the cover 18, the channel 20 of the filter cartridge 12 comprises a tubular outlet connector 28 Outlet connector 28 can be formed in one piece with a first end plate 30 of the piston 36 of the filter cartridge 12. A plurality of through openings 32 are formed in the outlet connection 28 of the channel 20. Via these through openings 32, the filtered oil can exit from the channel 20 and into one on the side of the

Oil filter housing 14 provided channel 34 to supply an internal combustion engine with lubricant. This is possible if the piston 36 of the

Filter cartridge 12 is displaced sufficiently far from the cover 18 in an axial direction 38 of the filter cartridge 12. The axial direction 38 is illustrated in FIG. 1 by a central axis of the filter cartridge 12 or of the oil filter 10.

1, the piston 36 of the filter cartridge 12, which comprises the filter material 22 arranged between the first end plate 30 and a second end plate 40 of the piston 36, is shown in a closed position in which the filtered oil escapes from the passage openings 32 and accordingly filtered oil is prevented from entering channel 34. In the closed position of the piston 36 shown in FIG. 1, an internal combustion engine of the motor vehicle is switched off.

Accordingly, an oil pump (not shown), which is usually driven by the internal combustion engine, does not deliver any unfiltered oil into the oil filter housing 14. As a result, no unfiltered oil is cleaned due to a flow through the filter material 22 of the filter cartridge 12. The closed position of the piston 36 can thus also be referred to as the motor-off position of the piston 36.

In an open position (not shown here) of the piston 36, the piston 36 in the oil filter housing 14 is spaced further from the cover 18. This displacement movement of the piston 36 of the filter cartridge 12 in the axial direction 38 from the closed position (see FIG. 1) into the open position within the

closed oil filter housing 14 is brought about by the pressure conditions prevailing in the oil filter housing 14 during operation of the oil filter 10. In the operation of the

This is because the internal combustion engine of the motor vehicle conveys the unfiltered oil into the oil filter housing 14. In particular, the oil from the unfiltered oil is on the

Upper and second end plate 40, which is larger in area, is greater than the pressure of the unfiltered oil on the lower and first end plate 30, which is smaller in area. Also taking into account the pressure at

Passage of the oil to be filtered through the filter material 22 occurring

Pressure loss, this pressure difference is sufficient to use the outlet connector 28 against the force of a check valve spring 42 to close 44 of the Push body 16 away from a tubular receptacle 46, which is provided in the base body 16.

The open position of the piston 36 can also be referred to as the motor-on position of the piston 36, because when the internal combustion engine of the motor vehicle is running or switched on or when the oil pump is in operation, the flow of the oil through the oil filter housing 14 causes the piston 36 to be displaced from the closed position to the open position.

As a result of the pressure conditions during operation of the oil filter 10

Sliding movement of the piston 36 thus pushes the piston 36 by means of the

Outlet connector 28, the closure part 44 against the force of the check valve spring 42 away from a valve seat provided on the tubular receptacle 46. As a result, in this (not shown) open position of the piston 36, the filtered oil can pass from the channel 20 into the channel 34 via the passage openings 32 formed in the outlet connection 28.

If, with the internal combustion engine of the motor vehicle running, the filter material 22 is so clogged that the pressure loss when the unfiltered oil passes through the filter material 22 into the channel 20 is further increased, the piston 36 of the filter cartridge 12 moves even further from the cover 18 in the axial direction 38 away into a bypass position (also not shown). Here, the tubular receptacle 46 is pressed against the force of a bypass valve spring 48 by means of the piston 36

Filter cartridge 12 pressed away from a valve seat 50, which is also provided on the side of the base body 16 in the oil filter housing 14. The unfiltered oil can then enter channel 34 directly.

For a detailed illustration and explanation of the interaction of the floating piston 36 of the filter cartridge 12 and the pressure conditions with the closure or valve device arranged in the vehicle in the oil filter housing 14, reference is also made to the explanations in FIG

WO 2017/088962 A1 referenced because the valve functions - check valve,

Bypass valve, service valve - implemented here and there in the same way; only the filter cartridge has changes compared to WO 2017/088962 A1.

In the present case, the piston 36 of the filter cartridge 12, which is movable in the axial direction 38 of the filter cartridge 12, serves both as a function Check valve provided as well as that of a bypass valve. In the open position of the piston 36, the check valve is opened, and in the bypass position of the piston 36, the bypass valve is also open.

In addition, a service valve 52 is integrated in the filter cartridge 12. For the

Service valve function is closed by means of a presently annular closure element 54 of the filter cartridge 12, which can be seen better in FIG. 2 and FIG. 3 than in FIG. 1, an outlet channel 56, which is shown in section in FIG. 1. The drain channel 56 is formed in the oil filter housing 14. If the drain channel 56 is not closed by means of the closure element 54, oil can escape from one

Receiving area 58 of the oil filter housing 14 can be drained via the drain channel 56. The filter cartridge 12 is arranged in the receiving region 58 when the oil filter housing 14 is closed.

In particular from FIGS. 2 and 3 it can be clearly seen that the closure element 54 can have an outer, in the present case annular seal 60 and a further, in the present case also annular inner seal 62 for closing the drain channel 56. The seals 60, 62 can be brought into contact with corresponding areas of the drain channel 56 if the closure element 54 closes the drain channel 56 approximately in the closed position of the piston 36 of the filter cartridge 12 shown in FIG. 1. However, the drain channel 56 is also closed in the open position (not shown) of the piston 36 and in the bypass position (also not shown) of the piston 36 by means of the closure element 54. Only when the cover 18 is removed from the base body 16 of the oil filter housing 14 and the filter cartridge 12 is removed from the oil filter housing 14, the service valve 52 is opened because the closure element 54 is then spaced from the drain channel 56. When open

Service valve 52 can therefore get oil from the receiving area 58 of the oil filter housing 14 into the drain channel 56.

In the present case, however, when moving the piston 36 of the filter cartridge 12 from the closed position shown in FIG. 1 to the above-described open position or motor-on position, in which the force of the

Check valve spring 42 is to be overcome, and also in the bypass position, in which the force of the bypass valve spring 48 is also to be overcome, a service valve spring is not additionally compressed, as is the case with the design of the floating filter cartridge according to WO 2017/088962 A1 is. In the case of the oil filter 10 described here, the closure element 54 is namely supported on the cover 18 of the oil filter housing 14 by means of a plurality of struts 64 of the filter cartridge 12 (compare FIGS. 2 and 3) when the oil filter housing 14 is closed. For this purpose, the free ends of the struts 64, of which only two struts 64 can be clearly seen in FIG. 1, protrude in the axial direction 38 both over the first end plate 30 and over the second end plate 40 of the piston 36.

When the oil filter housing 14 is closed, and thus the cover 18 on the

Base body 16 is fixed, consequently the struts 64 press the closure element 54 provided with the at least one seal 60, 62 against the drain channel 56 in such a way that an drain opening provided by the drain channel 56 is closed. In the present case, the struts 64 of the filter cartridge 12 are longer than the filter piston itself in order to allow it to be supported against the cover 18. However, other forms of supporting the struts 64 in the base body 16 of the oil filter housing 14, or in its receptacle 58, are also conceivable, the struts 64 then being able to be shorter than the length of the filter piston 36 and also not being guided on the second end plate 40 are.

Further details of the filter cartridge 12 will be explained with reference to the other figures. 2 and 3 that the respective struts 64 in respective end regions 66, which are distant from the closure element 54 and via which the closure element 54 can thus be supported on the cover 18, have respective stop elements approximately in shape of resilient locking tongues 68. These latching tongues 68 engage behind the end plate 40 remote from the closure element 54, that is to say the second end plate 40, in the region of tabs 70, which protrude in the radial direction beyond an edge of the second end plate 40. Passage openings, in the present case in the form of rectangular slots, are also formed in these tabs 70, the respective strut 64 being guided through the passage opening provided in the respective tab 70.

In an analogous manner, further tabs 72, which protrude in the radial direction over an edge of the first end plate 30, have further passage openings in the form of rectangular slots. Also through this

The respective struts 64 are passed through passage openings. The struts 64 are thus designed as guide elements which facilitate the displacement movement of the piston 36 of the filter cartridge 12 in the axial direction 38. In the variant of the filter cartridge 12 according to FIG. 2, the struts 64 are over the length of the piston 36 essentially straight across. In a section in which the respective strut 64 projects beyond the first, lower end plate 30, the struts 64 have a kink 74, which compensates for tolerances between the struts 64 and the distance between the discharge channel and the stop for the struts 64 in the cover 18 enables.

In the variant of the filter cartridge 12 shown in FIG. 3, further measures for tolerance compensation are provided. These measures can also result in manufacturing tolerances of the filter cartridge 12 with regard to the length of its struts 64 in the axial direction 38 and also manufacturing tolerances of the oil filter housing 14

Be taken into account.

According to FIG. 3, the respective struts 64 have respective guide regions 76, 78, in which the struts 64 essentially parallel to the axial direction 38

aligned and thus straight. The displacement movement of the piston 36 of the filter cartridge 12 relative to the struts 64 occurs in the guide regions 76, 78. The guide regions 76, 78 which have just been designed are therefore at least as long as a stroke or displacement path of the piston required to implement the functions of the check valve and the bypass valve.

Between the first, formed in the region of the first end plate 30

Guide area 76 and the second, in the area of the second end plate 40

trained guide area 78, the respective strut 64 has another

Length range 80 in which the respective strut 64 is arcuate and in the present case is curved outward in the radial direction. This arc shape allows the tolerance compensation between the

Drain hole or the drain channel 56 and the cover 18th

or provide filter cover.

Additionally or alternatively, according to FIG. 3, the respective strut 64 can have spring areas 82 in the form of defined kink areas. In these spring areas 82, a length of the respective strut 64 can be reduced when the struts 64 are acted upon in the axial direction 38. On the one hand, the arch shape of the respective strut 64 in the length region 80 means that a compensation arch is provided

Tolerance compensation provided in the assembly with the oil filter housing 14. For the purpose of such tolerance compensation, however, the defined kink area or spring area 82 can also be provided additionally or alternatively. In the present case, the respective strut 64 has at its end connected to the closure element 54 in the spring region 82 two legs 84, 86 which form a V-shape. The two spaced ends of the legs 84, 86 can be moved towards one another as a result of the application of force.

4 shows how, when the piston 36 is displaced relative to the struts 64, the second guide region 78 at the free end of the strut 64 in the region of the second end plate 40 further passes through the through openings formed in the tabs 70 of the second end plate 40, or further out of the passage openings than is the case in the closed position shown in FIG. 1 and in FIG. 3, or motor-off position, of the piston 36.

All of the measures for tolerance compensation described so far are ultimately based on designing the struts 64 in such a way that their axial extent is compressible when an axial force is applied to them.

5 that in the same situation in which the piston 36 is spaced further from the cover 18 of the oil filter housing 14 than in the closed position of the piston 36 shown in FIG. 1, the first guide region 76 - in

Direction to the closure element 54 - only a small distance in the axial direction 38 of the filter cartridge 12 protrudes beyond the first, lower end plate 30. The guidance of the piston 36 in the axial direction 38 of the filter cartridge 12 along the guide regions 76, 78, which pass through the through openings formed in the tabs 70, 72, is thus in particular from an overview of FIG. 3 with FIG. 4 and FIG. 5 clearly visible. Furthermore, the V-shape of the two legs 84, 86 in the kink area or spring area 82 is clearly visible from FIG. 5.

It can be seen in particular from the sectional view of the filter cartridge 12 in FIG. 6 that a carrier body of the closure element 54 having the seals 60, 62 can be formed in one piece with the struts 64. The seals 60, 62 are arranged on the presently ring-shaped carrier body.

It can be seen in particular from the enlarged detailed view in FIG. 7 that a groove-like inversion or indentation 88 is preferably formed in the first or lower end disk or end plate 30, which leads to an extension of the filter medium, or filter material 22, and thus leads to an enlargement of the available filter area with a constant displacement of the filter cartridge 12. The indentation 88 runs around the outlet connection 28 of the channel 20. An inner wall of the indentation 88 is formed here by the outlet connector 28. A filter material area 90 of the filter material 22 overlaps in the axial direction 38 with an outer wall 92 of the indentation 88.

The filter medium or filter material 22 is thus extended in the axial direction 38 by a length 94, illustrated by an arrow in FIG. 7, in comparison with a filter cartridge 12, in which the filter material 22 only extends up to a base 96 of the indentation 88 or up to one of the second End plate 40 would reach closer end of the outlet port 28. The length 94 essentially corresponds to a depth of the groove-like indentation 88.

Such an indentation 88 or an indentation designed in the manner of a groove in the region of the end plate 30 closer to the closure element makes it possible to provide a particularly large filter area of the filter material 22 while maintaining the displacement path of the floating filter cartridge 12 in which is necessary for the opening of the check valve or the opening of the bypass valve a given space available for the filter cartridge in the oil filter housing 14. Likewise, the indentation 88 makes it possible to maintain a reliable central guidance of the filter cartridge by means of a sufficient one

Overlap of the outlet connector 28 of the filter cartridge 12 with the tubular receptacle 46 on the side of the oil filter housing 14.

Claims

1. Oil filter for a motor vehicle, with a filter cartridge (12), which in one

Oil filter housing (14) of the oil filter (10) is arranged, the oil filter housing (14) comprising a base body (16) and a cover element (18), a piston (36) of the filter cartridge (12) having a channel (20) for filtered oil , which is surrounded at least in regions in the radial direction by a filter material (22) of the filter cartridge (12) and comprises an outlet connection (28), the filter material (12) between a first end plate (30) and a second end plate (40) of the Piston (36) is arranged, the piston (36) in the closed

Oil filter housing (14) can be displaced in an axial direction (38) of the filter cartridge (12) in order to prevent filtered oil from entering through a through opening (32) formed in the outlet connection (28) in a closed position of the piston (36) The channel (34) provided on the sides of the oil filter housing (14) and in an open position of the piston (36), in which the piston (36) is spaced further from the cover element (18) with respect to the closed position than in the closed position, Allow the oil to enter the channel (34) provided on the side of the oil filter housing (14), and the filter cartridge (12) has a closure element (54) by means of which a drain channel (56) can be closed, which is used to drain oil a receiving area (58) of the oil filter housing (14) is formed, in which the filter cartridge (12) is arranged,

characterized in that

the closure element (54) at the end of at least one strut (64)

Filter cartridge (12) is held, and the free end of the at least one strut (64) is supported in the closed oil filter housing (14), the piston (36) can be displaced relative to the at least one strut (64) in the axial direction (38) of the filter cartridge (12).

2. Oil filter according to claim 1,

characterized in that

the free end of the at least one strut (64) in the closed

Oil filter housing (14) is supported on the cover element (18) of the oil filter housing (14).

3. Filter cartridge for an oil filter (10) of a motor vehicle, which can be arranged in an oil filter housing (14) of the oil filter (10) comprising a base body (16) and a cover element (18), a piston (36) of the filter cartridge (12) a channel (20) for filtered oil, which is at least partially surrounded in the radial direction by a filter material (22) of the filter cartridge (12), and an outlet connection (28), the filter material (12) between a first end plate (30) and a second end plate (40) of the piston (36) is arranged, the piston (36) in the closed oil filter housing (14) being displaceable in an axial direction (38) of the filter cartridge (12) in order to be in a closed position of the piston ( 36) to prevent filtered oil from entering via at least one passage opening (32) formed in the outlet connection (28) into a channel (34) provided on the side of the oil filter housing (14), and in an open position of the piston (36), in which the piston (36) is spaced further from the cover element (18) with respect to the closed position than in the closed position to allow the oil to enter the channel (34) provided on the side of the oil filter housing (14), and The filter cartridge (12) has a closure element (54) by means of which a drain channel (56) can be closed, which is designed to drain oil from a receiving area (58) of the oil filter housing (14) provided for receiving the filter cartridge (12),

characterized in that

the closure element (54) is held on at least one strut (64) of the filter cartridge (12), and the free end of the at least one strut (64) can be supported in the closed oil filter housing (14), and the piston (36) relative to the at least one strut (64) is displaceable in the axial direction (38) of the filter cartridge (12).

4. filter cartridge according to claim 3,

characterized in that

the free end of the at least one strut (64) in the closed

Oil filter housing (14) on the cover element (18) of the oil filter housing (14) can be supported.

5. Filter cartridge according to claim 3 or 4,

characterized in that

the at least one strut (64) is designed as a guide element for guiding the piston (36) of the filter cartridge (12) when the piston (36) is displaced relative to the at least one strut (64).

6. Filter cartridge according to one of claims 3 to 5,

characterized in that

A passage opening is formed in at least one of the end plates (30, 40), through which the at least one strut (64) is guided.

7. filter cartridge according to claim 6,

characterized in that

the passage opening is formed in a tab (70, 72) which projects in the radial direction over an edge of the at least one end plate (30, 40).

8. Filter cartridge according to one of claims 5 to 7,

characterized in that

the at least one strut (64) has at least one guide region (76, 78) along which a respective end plate (30, 40) can be guided when the piston (36) is displaced, which is essentially parallel to the axial direction (38) of the filter cartridge ( 12) is aligned.

9. Filter cartridge according to claim 8,

characterized in that

the at least one strut (64) between a first, in the area of the first End plate (30) formed guide area (76) and a second, in the area of the second end plate (40) formed guide area (78) has a further length area (80), in which the at least one strut (64) is arcuate.

10. Filter cartridge according to claim 9,

characterized in that

the at least one strut (64) in the further length range (80) is curved outward in the radial direction.

1 1. filter cartridge according to one of claims 3 to 10,

characterized in that

the at least one strut (64) has at least one spring region (82) in which it can be compressed as a result of a force acting in the axial direction of the filter cartridge (12).

12. Filter cartridge according to claim 1 1,

characterized in that

the at least one strut (64) in the at least one spring region (82) has at least two legs (84, 86) forming a V shape, the ends of the legs (84, 86) being spaced apart from one another as a result of the

Force can be moved towards each other.

13. Filter cartridge according to claim 1 1 or 12,

characterized in that

the at least one spring area (82) is formed in a section of the at least one strut (64), in which the at least one strut (64) projects beyond the end plate (30) which of the two end plates (30, 40) connects the closure element ( 54) is closer.

14. Filter cartridge according to one of claims 3 to 13,

characterized in that

the end plate (30) of the two end plates (30, 40) closer to the closure element (54), surrounding the outlet connection (28) of the channel (20) of the filter cartridge (12), has an indentation (88), an inner wall of the indentation (88) by the outlet connection (28) is formed, and a filter material region (90) of the

Filter material (22) with an outer wall (92) of the indentation (88) overlaps in the axial direction (38) of the filter cartridge (12).

15. Filter cartridge according to one of claims 3 to 14,

characterized in that

the at least one strut (64) in an end region (66) at least one

Has stop element (66) which engages behind the end plate (40) of the two end plates (30, 40) further away from the closure element (54).

16. Filter cartridge according to one of claims 3 to 15,

characterized in that

the filter cartridge (12) has a plurality of struts (64) spaced apart from one another in the circumferential direction of the end plates (30, 40) and / or the struts (64) have a rectangular shape at least in regions in cross section.