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.
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.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0045] There are shown, respectively schematically
[0046] FIG. 1 a lateral view, partially in section, of a camshaft arrangement,
[0047] FIG. 2 a frontal view onto a bush of the camshaft arrangement,
[0048] FIG. 3 a longitudinal section through the bush,
[0049] FIG. 4 an isometric view of the bush,
[0050] FIG. 5 a section through the camshaft arrangement in the region of the bush,
[0051] FIG. 6 an isometric view of a slide ring of the camshaft arrangement,
[0052] FIG. 7 a longitudinal section through the camshaft arrangement in another example embodiment.
DETAILED DESCRIPTION
[0053] 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.
[0054] 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.
[0055] 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.
[0056] In the example embodiments which are shown, the coupling 21 is configured as an Oldham coupling 22.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] 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.
[0061] In FIG. 5 a section is shown through the camshaft arrangement 1 in the region of such a seal 32.
[0062] 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.
[0063] 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.
[0064] 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.
[0065] 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.
