CAMSHAFT ARRANGEMENT

Abstract

A camshaft arrangement includes an adjustable camshaft and an adjuster for adjusting the camshaft. The adjustable camshaft includes an outer shaft and an inner shaft arranged rotatably in the outer shaft. The adjuster includes a stator connected with the outer shaft in a rotationally fixed manner, and a rotor connected in a rotationally fixed inner with the inner shaft via an axially inserted coupling. A bush is connected with the rotor in a rotationally fixed manner and has at least one channel for supplying a lubricant. The bush has on a face side that axially faces the inner shaft a form that together with a counter-form on the inner shaft provides the axially inserted coupling.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to German Application No. DE 10 2019 217 295.4 filed Nov. 8, 2019, the contents of which are hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a camshaft arrangement with an adjustable camshaft and with an adjuster for adjusting the camshaft. The invention relates furthermore to an internal combustion engine system with an internal combustion engine and with such a camshaft arrangement.

BACKGROUND

A camshaft usually comes into use for the actuating of valves of an internal combustion engine. For this purpose, the camshaft has cams arranged on a shaft in a rotationally fixed manner, which cams actuate respectively associated valves accordingly.

In order to increase the variability of the actuation of the valves, so-called adjustable camshafts, also designated as phase-adjustable camshafts, are known for example from DE 10 2015 224 012 A1. Such a camshaft has an outer shaft and an inner shaft arranged in the outer shaft, which inner shaft is rotatable relative to the outer shaft. The respective shaft is connected with associated cams, so that a relative rotation between the inner shaft and the outer shaft leads to a phase shift between the cams of the outer shaft and the cams of the inner shaft.

In the production and in the operation of such adjustable camshafts, it is important to precisely maintain a relative alignment of the inner shaft to the outer shaft, as offsets between the inner shaft and the outer shaft lead to increased friction and therefore in particular to an increased wear and/or a reduced lifespan. In addition, such offsets can lead to a jamming of the inner shaft on the outer shaft, which disturbs the operation of the camshaft and/or blocks an adjusting of the camshaft.

For adjusting the camshaft, i.e. for the relative rotational movement between the inner shaft and the outer shaft, usually adjusters are used, which are connected with a stator in a rotationally fixed manner, and with a rotor in a rotationally fixed manner with the inner shaft.

Such a camshaft arrangement with an adjustable camshaft and with an associated adjuster is known from DE 10 2014 206 291 A1. In DE 10 2014 206 291 A1 it is proposed to connect the rotor of the adjuster with the inner shaft via an Oldham coupling, in order to compensate offsets between the inner shaft and the outer shaft in axial and angular direction. Here, a contour or form is provided on the inner shaft, and a counter-form or counter-contour is provided on an intermediate part which is connected with the rotor in a rotationally fixed manner, for the formation of the Oldham coupling. In addition, a sleeve for supplying the camshaft arrangement with a fluid for the simultaneous actuation and lubrication penetrates axially through the intermediate part, and into the inner shaft.

A disadvantage in camshaft arrangements which are known from the prior art are the complicated construction and the continual lack of compensation of offsets between the inner shaft and the outer shaft.

SUMMARY

The present invention is therefore concerned with the problem of indicating, for a camshaft arrangement of the above-mentioned type and for an internal combustion engine system with such a camshaft arrangement, improved or at least different embodiments, which in particular are distinguished by a simplified construction and/or by an improved compensation of offsets.

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

The present invention is based on the general idea of realizing, in a camshaft arrangement with an adjustable camshaft and with an adjuster for adjusting the camshaft, an axially inserted form-fitting connection as a coupling between a rotor of the adjuster and an inner shaft of the camshaft via an already present bush for supplying the arrangement with lubricant. Therefore, an additional intermediate part for realizing the form-fitting connection between the rotor and the inner shaft can be dispensed with, and the construction of the camshaft arrangement can thus be simplified. The omission of the additional intermediate part leads, furthermore, to an improved compensation of offsets between the inner shaft and the outer shaft of the camshaft, in particular of offsets in axial direction and/or angular offsets, i.e. offsets in circumferential direction.

In accordance with the idea of the invention, the camshaft arrangement has the adjustable camshaft and the adjuster. The camshaft has an outer shaft and an inner shaft arranged rotatably in the outer shaft, wherein the outer shaft and the inner shaft are respectively connected in a rotationally fixed manner with at least one associated cam. The adjuster has a stator and the rotor. Here, the stator is connected with the outer shaft in a rotationally fixed manner. The rotor is connected in a rotationally fixed manner with the bush, by which a supply of the arrangement with lubricant takes place. The bush has here at least one channel which in operation is connected with a connection for the fluidic supply of the arrangement by lubricant, wherein the connection is provided on an outer casing of the arrangement. According to the invention, the bush has on its face side facing the inner shaft axially, a form which, with a counter-form on the inner shaft, forms the axially inserted form-fitting connection and thus the coupling. With the realizing of the coupling between the rotor and the inner shaft via the bush, therefore with a simple construction a compensation of axial offsets and/or radial offsets of the inner shaft to the outer shaft takes place.

The directions indicated in the present case refer in particular to an axis of the outer shaft. The axial direction therefore corresponds in particular to the rotation axis of the outer shaft. The angular direction corresponds accordingly to the circumferential direction surrounding the axial direction. The lateral direction corresponds accordingly to a radial direction running perpendicularly to the axial direction. Accordingly, axial offsets of the inner shaft to the outer shaft are relative displacements of the inner shaft to the outer shaft in axial direction, angular offsets are relative movements of the inner shaft to the outer shaft in circumferential direction and lateral offsets are relative movements of the inner shaft to the outer shaft in radial direction.

An axially inserted form-fitting connection and therefore an axially inserted coupling is to be understood here to mean a coupling having the form on the bush and the counter-form on the inner shaft, wherein the form and counter-form are inserted axially into one another and therefore produce a rotationally fixed connection between the inner shaft and the rotor, which is connected with the bush in a rotationally fixed manner.

The coupling is preferably configured as an Oldham coupling. The coupling can therefore be implemented easily and at a favourable cost.

It is also conceivable to configure the coupling as an elastomer coupling.

In addition to lubricating, the lubricant also serves for actuation, in particular for adjusting the inner shaft relative to the outer shaft. Accordingly, the lubricant is preferably a fluid. In particular, the lubricant is lubricating oil. The bush is therefore in particular an oil guide bush.

The bush is expediently arranged axially between the rotor and the inner shaft. It is preferred when the bush is connected not only in a rotationally fixed manner with the rotor, but is fixed on the rotor, so that the bush is also connected axially and laterally securely with the rotor.

The counter-form provided on the inner shaft can be formed integrally on the inner shaft. Therefore, a simple construction of the arrangement and a reliable compensation of offsets with the aid of the coupling are possible.

It is also conceivable to provide between the face side of the bush and therefore between the form and the inner shaft an intermediate part with the counter-form, which is arranged on the inner shaft.

Embodiments are preferred in which the outer shaft projects axially over the inner shaft, on the side facing the bush, with a receiving section, wherein the bush is rotatably arranged in the receiving section of the outer shaft. This means that the bush is received and rotatably arranged in the outer shaft. This leads to a compact construction of the camshaft arrangement and a simple implementation of the coupling.

Embodiments prove to be advantageous in which at least one elastic seal is arranged between a radial inner side of the outer shaft, hereinbelow also designated as outer shaft inner side, in the receiving section, and a radial outer side of the bush, hereinafter also designated as bush outer side. Therefore, a fluidic sealing of the receiving region is achieved. In particular, the flowing of the lubricant from the receiving region is thus prevented or at least reduced. It is preferred here if at least two seals, spaced apart axially with respect to one another, are provided. An axial flowing of the lubricant in both axial directions is thus at least reduced.

It is preferred if at least one of the at least one seals is arranged and received in an associated, radially open outer groove in the outer shaft inner side or respectively in the bush outer side, advantageously in the bush outer side.

It is preferred here when the seal is arranged radially between the bush outer side and the associated slide ring.

Advantageously, an associated slide ring is arranged radially between at least one of the at least one seals, preferably the respective seal, and the outer shaft inner side or the bush outer side. Preferably, the slide ring is arranged radially between the associated seal and the outer shaft inner side. The slide ring serves here for the protection of the seal during relative movements, in particular rotations, between the outer shaft and the inner shaft. Thus, in particular, the transmission of shearing forces to the seal is prevented or at least reduced. Consequently, damage to the seal is reduced, so that a sealing takes place with the seal for a longer duration.

At least one of the at least one slide rings is advantageously a slotted slide ring, i.e. interrupted in circumferential direction. The slide ring can therefore be mounted in particular in a simplified manner. Rectangular rings are also conceivable.

The elastic seal can be configured basically in any desired manner. In particular, the seal is a ring seal. This leads to a homogeneous and/or improved sealing effect. Embodiments are also conceivable in the form of slide- or respectively rectangular rings with reduced adhesion- and sliding friction coefficient for an improved response behaviour and reduced losses in operation. In particular PTFE-coated rings are advantageous for this.

With the at least one seal and the coupling, the bush is advantageously arranged radially freely in the outer shaft. This means in particular to be spaced apart more radially between the bush to the outer shaft and/or that a bearing of the bush in the outer shaft can be dispensed with. Therefore, the outer shaft and/or the bush can be produced in a simplified manner. In particular, the outer shaft can be produced radially on the inner side and/or the bush can be produced radially on the outer side with higher tolerances. In particular, a fine processing of the outer shaft inner side can be dispensed with. In addition, in this way a simpler relative positioning of the rotor to the inner shaft is possible. In particular, in this way an exact lateral positioning of the rotor to the inner shaft can be dispensed with.

Alternatively or additionally, the rotor can be rotatably mounted via a radially exterior outer side of the outer shaft, hereinbelow also designated as outer shaft outer side. In particular, the rotor can be rotatably mounted exclusively via the outer shaft outer side. This leads in particular to the fact that a separate processing of the outer shaft inner side can be dispensed with, so that the outer shaft as a whole can be produced at a more favourable cost. In particular, it is thus possible to produce the outer shaft inner side with increased tolerances. At the same time, via the rotatably mounting of the rotor on the outer shaft outer side, a compensation and/or reduction of lateral offsets between the inner shaft and the outer shaft is achieved.

The mounting of the rotor on the outer shaft outer side is advantageously realized in such a way that the outer shaft has an axial projection which penetrates into the adjuster, in particular projects over the bush in axial direction. Here, the rotor is rotatably mounted on the outer shaft outer side of the projection. This leads in particular to the mounting of the rotor on the outer shaft being implemented in an installation-space-saving and efficient manner. In particular, in this way, owing to the vicinity of the rotor to the projection, a simple mounting of the rotor on the outer shaft can take place.

The rotationally fixed connection of the rotor with the bush, in particular the fixing of the rotor on the bush, is preferably realized via a pin which can be a component part of a screw. In particular, the pin can have an external thread which forms a screw connection with an internal thread of the bush. Here, a screw head or a nut of the screw connection can act upon the rotor axially against the bush, in such a way that a rotationally fixed connection of the rotor with the bush is provided.

The pin has advantageously in the interior a cavity, which is also designed hereinbelow as pin cavity. It is preferred here if the pin cavity is fluidically connected with the interior of the bush, in particular a cavity formed in the interior of the bush, designated hereinbelow also as bush cavity. In this way, it is possible in particular to realize the feeding and the discharging of the lubricant via the bush and the pin.

The camshaft arrangement expediently has a drive wheel which serves for driving the camshaft. The drive wheel is expediently connected with the stator in a rotationally fixed manner. The drive wheel can be driven in an associated system with an internal combustion engine, hereinbelow also designated internal combustion engine system, by a crankshaft of the internal combustion engine. Here, the drive wheel can be, in particular, a spur wheel.

It is conceivable here to form the drive wheel and the stator in a single part. This means in particular that the drive wheel and the stator can be fixed to one another via a materially bonded connection or a force-fitting connection.

In addition, it is conceivable to form the drive wheel and the stator in a single piece. In particular, the drive wheel and the stator can be produced jointly, for example by sintering.

An easy centring of the stator to the outer shaft can be achieved when the stator is connected directly or indirectly with the receiving section of the outer shaft. Thus, an easy centring of the adjuster relative to the outer shaft and/or to the inner shaft also takes place.

For centring the adjuster, alternatively or additionally at least one centring collar can be provided, for example on the drive wheel.

The bush can have, as mentioned above, a bush cavity which in particular serves for supplying the arrangement with the lubricant. The bush cavity is expediently closed on the side axially facing the form and therefore on the side axially facing the inner shaft.

The bush preferably has at least two channels, spaced axially with respect to one another, which are connected respectively fluidically with the bush cavity, wherein the channels are arranged axially between two slide rings. This leads to an improved mounting of the bush and therefore of the rotor in the inner shaft. It is advantageous here if for the respective slide ring an associated seal of the described type, therefore an elastic seal in radial direction, is provided. Thus in particular the region which is flowed through fluidically in operation is sealed in an improved manner.

It is advantageous if the bush in addition has at least two such channels spaced apart from one another in circumferential direction. Consequently in operation an improved supplying of the arrangement with lubricant takes place.

It shall be understood that in addition to the camshaft arrangement also an internal combustion engine system with such a camshaft arrangement belongs to the scope of this invention. The internal combustion engine system comprises, in addition to the camshaft arrangement, the internal combustion engine which has at least two valves which are actuated in operation by the cams of the camshaft.

Further important features and advantages of the invention will emerge from the subclaims, from the drawings and from the associated figure description with the aid of the drawings.

It shall be understood that the features mentioned above and to be explained further below are able to be used not only in the respectively indicated combination, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred example embodiments of the invention are illustrated in the drawings and are explained in further detail in the following description, wherein the same reference numbers refer to identical or similar or functionally identical components.

BRIEF DESCRIPTION OF THE DRAWINGS

There are shown, respectively schematically

FIG. 1 a lateral view, partially in section, of a camshaft arrangement,

FIG. 2 a frontal view onto a bush of the camshaft arrangement,

FIG. 3 a longitudinal section through the bush,

FIG. 4 an isometric view of the bush,

FIG. 5 a section through the camshaft arrangement in the region of the bush,

FIG. 6 an isometric view of a slide ring of the camshaft arrangement,

FIG. 7 a longitudinal section through the camshaft arrangement in another example embodiment.

DETAILED DESCRIPTION

A camshaft arrangement 1, as shown for example in FIGS. 1 to 7, serves in an otherwise not shown internal combustion engine system 2 for the actuation of valves, which are not shown, of an internal combustion engine, which is not shown. As can be seen in particular from FIG. 1, the camshaft arrangement 1 has an adjustable camshaft 3 with a hollow outer shaft 4 and an inner shaft 5, which is rotatably arranged in the outer shaft 4. The outer shaft 4 is rotatable about a rotation axis 6, which corresponds to an axial direction 7. In an optimum arrangement, the inner shaft 5 and the outer shaft 4 are coaxially arranged, i.e. the inner shaft 5 and the outer shaft 4 have the same rotation axis 6. On the outer shaft 4 at least one associated cam 8 is mounted in a rotationally fixed manner, by which a valve of the internal combustion engine can be actuated. In addition, an associated cam 38 is mounted in a rotationally fixed manner on the inner shaft 5, by which a valve of the internal combustion engine can be actuated. The camshaft arrangement 1 of FIG. 1 can have, furthermore, a drive wheel 9, which is connected with the outer shaft 4 in a rotationally fixed manner and thus rotates the outer shaft 4. For the relative rotating of the inner shaft 5 to the outer shaft 4 and thus for adjusting the camshaft 3, the camshaft arrangement 1 has an adjuster 10. The adjuster 10 has a stator 11 which is connected with the outer shaft 4 in a rotationally fixed manner. The stator 11 is connected, for example via screw connections 13, with the drive wheel 9 in a rotationally fixed manner. The adjuster 10 has, in addition, a rotor 12 connected with the inner shaft 5 in a rotationally fixed manner, which rotor is rotatable relative to the stator 11, wherein this takes place via a corresponding rotation of the rotor 12 to the stator 11. In the example embodiment shown in FIG. 1, the stator 11 is arranged radially between the drive wheel 9 and the outer shaft 4. The rotor 12 is arranged axially on the face side of the drive wheel 9. In FIG. 1 a side view of the camshaft arrangement 1 can be seen, wherein the camshaft arrangement 1 is shown axially between the adjuster 10 and the inner shaft 5 in an axially running longitudinal section, which runs centrally radially.

As can be seen from FIG. 1, the camshaft arrangement 1, hereinbelow also abbreviated as arrangement 1, has a bush 14 which serves for supplying the arrangement 1 with a lubricant, in particular with oil. The lubricant, in addition to lubricating, serves furthermore for the actuation, in particular for the relative moving, of the inner shaft 5 to the outer shaft 4. For this purpose, in operation the bush 4 is supplied fluidically with the lubricant via at least one connection 15 provided on an outer casing of the arrangement 1, wherein in the example embodiment shown in FIG. 1 two such connections 15 are provided, one of which serves for the feeding of the lubricant and the other serves for the discharging of the lubricant. For the respective connection 15, the bush 14 has at least one channel 16, which fluidically connects a cavity 17, formed in the interior of the bush 14, hereinbelow also designated as bush cavity 17, with the associated connection 15. In the examples which are shown, the bush 14 has for the respective connection 15 at least two associated channels 16, which are spaced apart from one another in a circumferential direction 37. The respective channel 16 runs here radially through the bush 14.

As can be seen in particular from FIG. 1, the rotor 12 is connected via the bush 14 in a rotationally fixed manner with the inner shaft 5. Here, the bush 14 is arranged axially between the rotor 12 and the inner shaft 5. For the rotationally fixed connection of the rotor 12 with the inner shaft 5, the bush 14 has, on its face side 18 facing the inner shaft 5 axially, a form 19 which is axially inserted with a counter-form 20 on the inner shaft 4 and thus forms an axially inserted coupling 21. For this purpose, in the example embodiments which are shown, an intermediate piece 23, having the counter-form 20, is mounted on the inner shaft 5 in a rotationally fixed manner and Is arranged axially between the face side 18 of the bush 14 and the inner shaft 5. FIG. 2 shows here a frontal view in axial direction 7 onto the face side 18 and thus onto the form 19, and FIG. 3 shows the section, designed by III in FIG. 2, in axial direction 7 through the bush 14. FIG. 4 shows an isometric view of the bush 14.

In the example embodiments which are shown, the coupling 21 is configured as an Oldham coupling 22.

As can be seen in particular from FIG. 3, in the example embodiments which are shown, the bush 14 is configured to be closed on the side facing the face side 18 and to be open on the side facing away from the face side 18. In the example embodiments which are shown, the rotationally fixed connection of the rotor 12 with the bush 14 takes place via a pin 24, which is a component part of a screw 25 with a screw head 26. For this purpose, the pin 24 has an external thread, which is not shown, which interacts with an internal thread, not shown, in the cavity 17 of the bush 14, wherein the screw head 26 presses the rotor 12 axially in the direction of the bush 14 and thus connects the rotor 12 with the bush 14 in a rotationally secure manner.

As can be seen from FIG. 1, the pin 24 in the example embodiments which are shown is of hollow design and has in its interior a cavity 27, which is also designated below as pin cavity 27. The pin cavity 27 is open on the side axially facing the bush 14 or respectively the inner shaft 5, so that the pin cavity 27 and the bush cavity 17 are fluidically connected with one another.

As can be seen from FIGS. 1, 3 and 4, the outer shaft 4 projects in axial direction 7 beyond the inner shaft 5 and has a receiving section 28 projecting over the inner shaft 5, in which receiving section the bush 14 is received and rotatably arranged. Here, the connections 15 are respectively formed in the receiving section 28 of the outer shaft 4. Hereby, via the drive wheel 9, which is connected with the stator 11 and is mounted on the receiving section 28, a centring of the adjuster 10, in particular of the stator 11, to the outer shaft 4 also takes place.

As can be seen in particular from viewing FIGS. 1, 3 and 4 together, in the example embodiment shown in FIGS. 1 to 5, the bush 14, and consequently the rotor 12, is arranged rotatably within the receiving section 28. Here, the outer shaft 4 has a radially interior inner side 29, also designated below as outer shaft inner side 29. The bush 14 has a radially exterior outer side 30, also designated below as bush outer side 30. Radially between the outer shaft inner side 29 and the bush outer side 30, at least one elastic seal 32, in particular a ring seal 33, is arranged, by which in particular a flowing off of the lubricant is prevented or at least reduced. In the example embodiment which is shown, two such seals 32 are used, which are spaced apart from one another in axial direction 7, wherein the channels 18 of the bush 14 and the connections 15 are arranged axially between the seals 32. Consequently, a flowing off of the lubricant in both directions is prevented or at least reduced. The bush 14 has here on the bush outer side 30 for the respective seal 32 a radially outwardly open and annular outer groove 34, in which the seal 32 is received.

In FIG. 5 a section is shown through the camshaft arrangement 1 in the region of such a seal 32.

As can be seen in particular from FIG. 5, an associated slide ring 31 is arranged radially between the respective seal 32 and the outer shaft inner side 29 or the bush outer side 30. In the example embodiment which is shown, and preferably, the respective slide ring 31 is arranged radially between the seal 32 and the outer shaft inner side 29. With the slide ring, a protection takes place of the associated seal 32 with respect to relative movements, in particular rotations, between the inner shaft 5 and the outer shaft 4. Such a slide ring 31 is illustrated in FIG. 6 separately and isometrically. It can be seen from FIG. 6 that the slide ring 31 is interrupted in circumferential direction 37 and is thus configured to be slotted.

The seals 32 and the coupling 21 allow the bush 14 to be positioned radially freely in the outer shaft 4. A mounting of the bush 14 in the outer shaft 4 can thus be dispensed with.

Another example embodiment of the camshaft arrangement 1 is shown in FIG. 7, wherein FIG. 7 shows a section through the camshaft arrangement 1 in axial direction 7 and thus a longitudinal section, and wherein the rotor 12 is not illustrated. The example embodiment shown in FIG. 7 differs from the example embodiment shown in FIGS. 1 to 6 in that the rotor 12, which is not shown in FIG. 7, is rotatably mounted on a radially exterior outer side 35 of the outer shaft 4, also designated below as outer shaft outer side 35. The bush 14 is thus also rotatably mounted via the rotor 12 on the outer shaft outer side 35, so that a mounting on the outer shaft inner side 29 can be dispensed with. For mounting the rotor 12 on the outer shaft outer side 35, the outer shaft 4 in the example embodiment shown in FIG. 7 has a projection 36 penetrating axially into the adjuster 10, wherein the rotor 12 is rotatably mounted on the outer shaft outer side 35 of the projection 36. Here, seals 32, in particular ring seals 33, radially between the outer shaft inner side 29 and the bush outer side 30, can be received in the outer grooves 34, in order to achieve a corresponding sealing. In the example embodiment shown in FIG. 7, it is illustrated that the stator 11 for rotationally fixed connection with the outer shaft 4 can be mounted on the outer shaft outer side 35 in a rotationally fixed manner, in particular can be shrunk on.

The respective camshaft arrangement 1 compensates via the coupling 21 an axial and angular offset between the inner shaft 5 and the outer shaft 4. Through the mounting of the rotor 12 and of the bush 14 on the outer shaft, in addition a lateral offset is compensated between the inner shaft 5 and the outer shaft 4. In addition, in this way the respective camshaft arrangement 1 is able to be produced in a compact and simple manner.

Claims

1-11. (canceled)

12. A camshaft arrangement, comprising:

an adjustable camshaft and an adjuster for adjusting the camshaft,

the camshaft having an outer shaft and an inner shaft arranged rotatably in the outer shaft, the outer shaft and the inner shaft respectively connected with at least one associated cam in a rotationally fixed manner,

the adjuster including a stator connected with the outer shaft in a rotationally fixed manner, and a rotor,

the rotor connected in a rotationally fixed manner with the inner shaft via an axially inserted coupling, such that a rotation of the rotor relative to the stator leads to a relative rotation of the inner shaft to the outer shaft,

a bush connected with the rotor in a rotationally fixed manner and has at least one channel for supplying a lubricant, the at least one channel in operation for supplying with lubricant is fluidicially connected with a connection provided on an outer casing, and

wherein the bush has on a face side that axially faces the inner shaft a form that together with a counter-form on the inner shaft provides the axially inserted coupling.

13. The camshaft arrangement according to claim 12, wherein the coupling is configured as an Oldham coupling.

14. The camshaft arrangement according to claim 12, wherein:

the outer shaft projects axially over the inner shaft with a receiving section on the side facing the bush, and

the bush is rotatably arranged in the receiving section.

15. The camshaft arrangement according to claim 14, further comprising at least one elastic seal arranged radially between an outer shaft inner side of the receiving section and a bush outer side of the bush.

16. The camshaft arrangement according to claim 15, further comprising a slide ring arranged radially between the outer shaft inner side or the bush outer side and the at least one elastic seal.

17. The camshaft arrangement according to claim 12, wherein the bush is arranged radially freely in the outer shaft.

18. The camshaft arrangement according to claim 12, wherein the rotor is rotatably mounted via a radially exterior outer shaft outer side of the outer shaft.

19. The camshaft arrangement according to claim 18, wherein:

the outer shaft has a projection, protruding axially and penetrating into the adjuster, and

the rotor is rotatably mounted on the outer shaft outer side of the projection.

20. The camshaft arrangement according to claim 12, further comprising:

a pin that penetrates axially into the bush and connects the bush with the rotor in a rotationally fixed manner, and

wherein the pin has a pin cavity that is fluidically connected with the interior of the bush.

21. The camshaft arrangement according to claim 12, further comprising a drive wheel for driving the camshaft, wherein the drive wheel is formed in one part with the stator.

22. The camshaft arrangement according to claim 15, wherein:

the bush has a bush cavity that is closed on the side facing the form,

the bush has at least two channels, spaced axially with respect to one another, and are respectively connected fluidically with the bush cavity, and

the at least two channels are arranged axially between two seals.

23. An internal combustion engine system, comprising: an internal combustion engine having at least two valves, and a camshaft arrangement for actuating the at least two valves, the camshaft arrangement including:

an adjustable camshaft and an adjuster for adjusting the camshaft,

the camshaft having an outer shaft and an inner shaft arranged rotatably in the outer shaft, the outer shaft and the inner shaft respectively connected with at least one associated cam in a rotationally fixed manner,

the adjuster including a stator connected with the outer shaft in a rotationally fixed manner, and a rotor,

the rotor connected in a rotationally fixed manner with the inner shaft via an axially inserted coupling, such that a rotation of the rotor relative to the stator leads to a relative rotation of the inner shaft to the outer shaft,

a bush connected with the rotor in a rotationally fixed manner and having at least one channel for supplying a lubricant, the at least one channel in operation for supplying with lubricant is fluidicially connected with a connection provided on an outer casing,

wherein the bush has on a face side that axially faces the inner shaft a form that together with a counter-form on the inner shaft provides the axially inserted coupling.

24. The internal combustion engine system according to claim 23, wherein the axially inserted coupling is configured as an Oldham coupling.

25. The internal combustion engine system according to claim 23, wherein the outer shaft projects axially over the inner shaft with a receiving section on the side facing the bush, and the bush is rotatably arranged in the receiving section.

26. The internal combustion engine system according to claim 25, wherein the camshaft arrangement further includes at least one elastic seal arranged radially between an outer shaft inner side of the receiving section and a bush outer side of the bush.

27. The internal combustion engine system according to claim 25, wherein the bush is arranged radially freely in the outer shaft.

28. The internal combustion engine system according to claim 23, wherein the rotor is rotatably mounted via a radially exterior outer shaft side of the outer shaft.

29. The internal combustion engine system according to claim 28, wherein the outer shaft has a projection protruding axially and penetrating into the adjuster, and wherein the rotor is rotatably mounted on the outer shaft outer side of the projection.

30. The internal combustion engine system according to claim 23, further comprising a pin that penetrates axially into the bush and connects the bush with the rotor in a rotationally fixed manner, wherein the pin has a pin cavity that is fluidically connected with an interior of the bush.

31. The internal combustion engine system according to claim 23, further comprising a drive wheel for driving the camshaft, wherein the drive wheel is formed in one part with the stator.