COMBINED PLUG-SENSOR WHEEL FOR A CAMSHAFT

Abstract

A combined plug-sensor wheel for a camshaft is disclosed. The combined plug-sensor wheel includes a pin projecting in an axial direction of the camshaft. The pin, when inserted into the camshaft, seals the camshaft in a fluid-tight manner. According to an implementation, the combined plug-sensor wheel and the camshaft are incorporated into an internal combustion engine.

Claims

1. A combined plug-sensor wheel for a camshaft, comprising: a pin projecting in an axial direction that, when inserted into the camshaft, seals the camshaft in a fluid-tight manner.

2. The plug-sensor wheel according to claim 1, wherein the plug-sensor wheel is composed of a sinter material, a plastic or steel.

3. The plug-sensor wheel according to claim 1, wherein at least one of: an axial length of the pin amounts to between 20% and 40% of a diameter of the pin, and an axial length of the pin amounts to at least 4 mm.

4. The plug-sensor wheel according to claim 1, wherein the pin is at least partially hollow.

5. The plug-sensor wheel according to claim 1, wherein the combined plug-sensor wheel is formed integrally.

6. The plug-sensor wheel according to claim 1, wherein at a free end of the pin an introduction chamfer is provided.

7. The plug-sensor wheel according to claim 1, wherein at a transition from the pin to a sensor wheel an undercut or a fillet radius is provided.

8. A camshaft, comprising: a plug-sensor wheel inserted in the camshaft at an end side, the plug-sensor wheel including: a pin projecting in an axial direction that, when inserted into the camshaft, seals the camshaft in a fluid-tight manner.

9. The camshaft according to claim 8, wherein the camshaft and the plug-sensor wheel are pressed, bonded, press-fit stemmed, welded or soldered together.

10. An internal combustion engine, comprising: at least one camshaft and a plug-sensor wheel inserted in an end side of the camshaft, the plug-sensor wheel including: a pin projecting in an axial direction that, when inserted into the camshaft, seals the camshaft in a fluid-tight manner.

11. The internal combustion engine according to claim 10, wherein the camshaft and the plug-sensor wheel are pressed, bonded, press-fit stemmed, welded, or soldered together.

12. The internal combustion engine according to claim 10, wherein the pin is at least partially hollow.

13. The internal combustion engine according to claim 10, wherein at least one of: an axial length of the pin amounts to between 20% and 40% of a diameter of the pin, and an axial length of the pin amounts to at least 4 mm.

14. The internal combustion engine according to claim 10, wherein the pin is formed integrally with a sensor wheel of the plug-sensor wheel.

15. The camshaft according to claim 8, wherein an axial length of the pin amounts to between 20% and 40% of a diameter of the pin.

16. The camshaft according to claim 8, wherein an axial length of the pin amounts to at least 4 mm.

17. The camshaft according to claim 8, wherein the pin is at least partially hollow

18. The camshaft according to claim 8, wherein the pin includes an introduction chamfer at a free end thereof.

19. The camshaft according to claim 8, wherein at a transition from the pin to a sensor wheel of the plug-sensor wheel an undercut is provided.

20. The camshaft according to claim 8, wherein at a transition from the pin to a sensor wheel of the plug-sensor wheel a fillet radius is provided.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] There it shows, in each case schematically

[0023] FIG. 1 a front view of a combined plug-sensor wheel according to the invention,

[0024] FIG. 2 a sectional representation through the combined plug-sensor wheel according to the invention,

[0025] FIG. 3 a sectional representation through a camshaft having such a combined plug-sensor wheel according to the invention.

DETAILED DESCRIPTION

[0026] According to the FIGS. 1 to 3, a plug-sensor wheel 1 for a camshaft 2 (see FIG. 3) according to the invention comprises a pin for projecting in the axial direction 3, which when inserted into the camshaft 2 (see FIG. 3) seals the latter in a fluid-tight manner. By way of this, an interior 5 of a camshaft tube 6 of the camshaft 2 can be sealed so as to be fluid-tight, in particular oil-tight, as a result of which the interior 5 can also receive pressurised oil for example for the phase adjusting of the camshaft 2 without leakage. Through the combination of a sensor wheel 7 with a plug 8 (pin 4) according to the invention to form the combined plug-sensor wheel 1 according to the invention, two functions, namely on the one hand a detection of an angle-of-rotation position of the camshaft 2 and on the other hand a sealing of the interior 5 of the camshaft tube 6 can be combined in a common component. By way of this, only a single, namely common, production process is required, as a result of which the combined plug-sensor wheel 1 according to the invention, compared with two components produced separately, namely a plug 8 and a sensor wheel 7, can be produced significantly more cost-effectively. By combining the two components 7, 8 the storage and logistical costs as well as the assembly costs are also reduced, since merely the combined plug-sensor wheel 1 has to be assembled on the camshaft tube 6 in a production step.

[0027] The plug-sensor wheel 1 is preferentially produced integrally, for example from a sinter material, from plastic or from steel. By way of this, a high-quality and cost-effective production can be achieved.

[0028] An axial length L.sub.Z of the pin 4 amounts to between 20 and 40% of the diameter D.sub.Z of the pin 4, by way of which a sufficiently large joining area with the camshaft tube 6 is achieved.

[0029] Viewing the FIG. 3 it is noticeable that the pin 4 can still comprise an optional longer region 4′, which reaches in particular under a function element 9 adjacent to the sensor wheel 7 of the combined plug-sensor wheel 1, for example cam 10.

[0030] Viewing FIG. 2 of the combined plug-sensor wheel 1 according to the invention, it is noticeable on the pin 4 that the same is formed hollow, for example includes a so-called cupping, by way of which not only material and thus resources can be saved, but at the same time, also weight are saved and thus upon an application of the plug-sensor wheel 1 according to the invention in an internal combustion engine 11, a reduction of the fuel consumption is made possible.

[0031] In order to definitely achieve a reliable sealing of the interior 5 of the camshaft tube 6, the axial length L.sub.Z can amount to at least 4 mm. A connection between the combined plug-sensor wheel 1 and the camshaft 2 or the camshaft tube 6 of the latter can take place for example by way of pressing, press-fit stemming, bonding, soldering or welding. A positive-locking connection is also conceivable as is a thermal joining. Here, a press-fit in particular makes possible connecting the combined plug-sensor wheel 1 to the camshaft 2 in a cost-effective, tight, non-rotatable and reliable manner.

[0032] The combined plug-sensor wheel 1 according to the invention can additionally comprise at a transition from the pin 4 to the sensor wheel 7 an undercut or a fillet radius 12 (see FIG. 2), as a result of which a notching effect can be reduced and a lifespan increased.

[0033] A further major advantage of the combined plug-sensor wheel 1 according to the invention is a reduced loading of the sensor wheel 7 when the pin 4 is pressed in. Compared with a separate plug produced as a cold extruded part, the combined plug-sensor wheel 1 according to the invention additionally has cost advantages.

[0034] At a free end of the pin 4, the same, i.e. the plug 8, can comprise an introduction chamfer 13 (see FIG. 2), which makes possible in particular introducing the pin 4 into the camshaft tube 6, in particular also without canting. Analogously, such an introduction chamfer can obviously be also arranged on the inner lateral surface at the longitudinal end of the camshaft tube 6.

[0035] With the combined plug-sensor wheel 1 according to the invention and the camshaft 2 according to the invention, a function integration of a sensor wheel formed separately to date and of a plug formed separately to date can be achieved, so that the combined plug-sensor wheel 1 according to the invention cannot only seal the interior 5 of the camshaft tube 6 of the camshaft 2 but via the sensor wheel 7 also detects an angle-of-rotation position. Altogether, by combining the plug 8 and the sensor wheel 7 to form the combined plug-sensor wheel 1, a reduction of the parts variety and connected with this a reduction of the storage and logistical costs as well as the assembly costs can also be achieved.