SYSTEM CONSISTING OF A CAMSHAFT AND A CAMSHAFT SLEEVE

Abstract

A system including a camshaft and a camshaft sleeve. The camshaft sleeve has a sleeve-shaped main body for receiving an end piece of the cam-shaft. The main body includes a joining region, a bearing region and a seat region. The main body and the camshaft are configured in such a way that, in the mounted state, the cam-shaft is joined in the joining region to the camshaft sleeve, the system having, in the bearing region, a clearance between the camshaft and the camshaft sleeve, and the camshaft and the camshaft sleeve are connected to one another in the seat region via a positively locking means and/or a frictionally lock, in particular a toothing system.

Claims

1.-9. (canceled)

10. A system, comprising: a camshaft including an end piece, and a camshaft sleeve, the camshaft sleeve including: a sleeve-shaped main body configured to receive the end piece, the main body comprising: a joining region, a bearing region and a seat region, wherein the main body and the camshaft are configured such that, in a mounted state, the camshaft is joined in the joining region to the camshaft sleeve, wherein the system has, in the bearing region, a clearance between the camshaft and the camshaft sleeve, and the camshaft and the camshaft sleeve are connected to one another in the seat region via at least one positive lock or a frictional lock.

11. The system of claim 10, wherein the camshaft and the camshaft sleeve are connected to one another via a toothing system.

12. The system of claim 10, wherein the bearing region is arranged axially between the joining region and the seat region.

13. The system of claim 10, wherein the main body has, in the bearing region, a cylindrical cavity, a diameter of which is greater than an external diameter of the end piece of the camshaft which is arranged within the bearing region in the mounted state.

14. The system of claim 10, wherein the camshaft has a toothing system in a section which is provided for the seat region in the mounted state.

15. The system of claim 14, the toothing system of the camshaft engaging, in the mounted state, into an internal toothing system in the seat region of the main body.

16. The system of claim 15, the toothing system and the internal toothing system in the seat region having an overlap.

17. The system of claim 10, wherein the camshaft sleeve comprises a sinter-hardened component.

18. The system of claim 10, wherein the camshaft sleeve is joined at least partially onto a turned part.

19. The system of claim 18, wherein the turned part is made of a material which is capable of being hardened.

20. A method for assembling the system of claim 10, comprising: introducing the camshaft end piece into the sleeve-shaped main body, orienting the camshaft by way of the at least one positive lock or the frictional lock in the seat region, and joining the camshaft with a distal end of the end piece in the joining region of the sleeve-shaped main body.

Description

[0017] Further details, features and advantages of the invention result from the drawings and from the following description of embodiments using the drawings. Here, the drawings illustrate merely exemplary embodiments of the invention which do not restrict the concept of the invention.

[0018] FIG. 1 shows a system comprising a camshaft and a camshaft sleeve in accordance with one exemplary embodiment of the present invention.

[0019] FIG. 2 shows a sectional view and a perspective view of a system comprising a camshaft and a camshaft sleeve in accordance with a further exemplary embodiment of the present invention in a non-mounted state.

[0020] FIG. 3 shows a sectional view and a perspective view of a system comprising a camshaft and a camshaft sleeve in accordance with the further exemplary embodiment of the present invention in a mounted state.

EMBODIMENTS OF THE INVENTION

[0021] Identical parts are always provided with the same designations in the different figures, and will therefore as a rule also be named or mentioned in each case only once.

[0022] FIG. 1 shows a system comprising a camshaft 20 and a camshaft sleeve 10 in accordance with one exemplary embodiment of the present invention. For example, this is a system which is used in a vacuum pump or fuel pump or in an internal combustion engine. It is provided here that the camshaft sleeve 10 terminates the camshaft 20 at one end and is provided for mounting in a camshaft holder. For the mounting in the camshaft holder, the camshaft sleeve 10 comprises, for example, a circumferential projection or collar 16, by way of which the system is connected to the camshaft holder in the installed state. Here, in particular, the camshaft sleeve 10 has a sleeve-shaped main body 17, through the one open end of which the camshaft 20 engages into the main body 17 in a mounted state. Here, the sleeve-shaped main body 17 encases an end piece of the camshaft 20 and therefore forms a termination of the camshaft 20, for example, in the mounted state. It is provided, furthermore, that the camshaft 20 and the camshaft sleeve 10 are configured in such a way that, in the mounted state, the system comprises a joining region 13, a bearing region 12 and a seat region 11. In order to configure a joining region 13, it is provided, in particular, that the camshaft 20 comes into contact by way of its end side with an at least partially closed end side of the sleeve-shaped main body 17 and is joined in said joining region. To this end, the internal diameter of the seat in the joining region 13, which seat is predefined by the sleeve-shaped main body 17, corresponds substantially to the external diameter of the camshaft 20, in particular on the end side of the camshaft 20. In order to configure a bearing region 12, it is conceivable that the internal diameter of the main body 17 in the bearing region 12 is greater than the external diameter of the camshaft 20, with the result that a clearance 15 is configured between the camshaft 20 and the camshaft sleeve 10. As viewed in the axial direction, the internal diameter increases here from the joining region 13 to the bearing region 12. Furthermore, it is conceivable here that a transition between the internal diameter of the joining region 13 and the internal diameter of the bearing region 12 takes place in a stepped or continuous manner. The clearance 15 which is necessitated as a result of the variation of the internal diameter between the camshaft 20 and the camshaft sleeve 10 advantageously prevents a diameter change of a finally machined bearing external diameter. In order to configure a seat region 11, it is provided that the sleeve-shaped main body 17 has, in particular at its open end, an internal toothing system 14, and the camshaft 20 has a toothing system 21 along its circumference, the toothing system 21 of the camshaft 20 and the internal toothing system 14 of the main body 17 engaging into one another in the seat region 11. Furthermore, it is conceivable that the toothing system 21 extends further or longer along an axial direction than the internal toothing system 14 of the main body 17. The use of toothed structures in the seat region proves advantageous, in so far as a targeted angular orientation, an additional transmission of a torque and an additional axial firm seat for the camshaft in the camshaft sleeve are possible in an advantageous way as a result. It is provided here, for example, that the toothing system in the seat region has an overlap which is greater than 1.5, in particular is greater than 2.5.

[0023] FIG. 2 shows a sectional view (top) and a perspective view (bottom) of a system comprising a camshaft 20 and a camshaft sleeve 10 in accordance with a further exemplary embodiment of the present invention in a non-mounted state, whereas FIG. 3 illustrates a sectional view and a perspective view of a system comprising a camshaft 20 and a camshaft sleeve 10 in accordance with a second exemplary embodiment of the present invention in a mounted state. The system which is shown in FIGS. 2 and 3 differs from that from FIG. 1 substantially in that the toothing system on the camshaft protrudes further out of the sleeve-shaped main body 17, and the internal toothing system 14 on the sleeve-shaped main body 17 can be seen.

LIST OF DESIGNATIONS

[0024] 10 Camshaft sleeve [0025] 11 Seat region [0026] 12 Bearing region [0027] 13 Joining region [0028] 14 Internal toothing system [0029] 15 Clearance [0030] 16 Collar [0031] 17 Main body [0032] 20 Camshaft [0033] 21 Toothing system [0034] 30 Cavity