Phase-adjusting device of a camshaft for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-8978605-B2
Application number	US-201214126182-A
Country	US
Kind code	B2
Filing date	Feb 27, 2012
Priority date	Jun 15, 2011
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

A camshaft adjusting device of an internal combustion engine having two camshafts supported concentrically to one another, the axial position of the outer camshaft being determined by an axial bearing and the outer camshaft interacting with a sealing cover of an adjusting apparatus. A first cam is rotationally fixed to the outer camshaft. A second cam is rotationally fixed to the inner camshaft, which can be rotated relative to the outer camshaft by the adjusting apparatus, wherein the inner camshaft has a locking contour on at least one section of the outside of the inner camshaft, which locking contour engages in a form-closed manner in a mating contour on at least one section of the inside of the outer camshaft in order to fix the axial position of the inner camshaft relative to the outer camshaft.

First claim

What is claimed is:

1. A camshaft adjusting device of an internal combustion engine having an outer camshaft supported concentrically on an inner camshaft, an axial position of the outer camshaft being determined by an axial bearing, the adjusting device comprising:
a sealing cover having an active relationship with the outer camshaft of an adjusting,
a first cam being rotatably fixedly mounted on the outer camshaft, and
a second cam being rotatably fixedly connected to the inner camshaft,
the inner camshaft furthermore being rotatable relative to the outer camshaft with the aid of the adjusting device, the inner camshaft having a locking contour on at least one section of an outside, the locking contour engaging in a form-fitting manner with a mating contour on at least one section of an inside of the outer camshaft to fix an axial position of the inner camshaft relative to the outer camshaft.

2. The camshaft adjusting device as recited in claim 1 further comprising an axial sliding seat between a sealing cover and the outer camshaft.

3. The camshaft adjusting device as recited in claim 1 wherein the locking contour, together with the mating contour, is designed in the manner of a bayonet joint connection.

4. The camshaft adjusting device as recited in claim 3 wherein the bayonet joint connection is without axial clamping.

5. The camshaft adjusting device as recited in claim 1 wherein the locking contour is designed as at least one projection located on a circumferential section of the inner camshaft, the circumferential section extending over more than 10 degrees but no more than 180 degrees of the circumference of the inner camshaft.

6. The camshaft adjusting device as recited in claim 5 wherein the projection is designed as a 180-degree segment.

7. The camshaft adjusting device as recited in claim 5 wherein the projection is provided on an originally separate shaft end component non-detachably connected to the inner camshaft, or a sliding seat is implemented by a sliding toothed area on an originally separate shoulder component non-detachably connected to the outer camshaft.

8. The camshaft adjusting device as recited in claim 1 wherein the mating contour is designed as a groove.

9. The camshaft adjusting device as recited in claim 1 wherein multiple projections are distributed on an outside of the inner camshaft, and multiple grooves or groove sections matching the projections are distributed on an inside of the outer camshaft to facilitate an undercut for a form fit.

10. The camshaft adjusting device as recited in claim 1 wherein the first or the second cam is designed as an inlet cam or as an outlet cam.

11. An internal combustion engine comprising:
an inner camshaft;
an outer camshaft supported concentrically on the inner camshaft; and
the camshaft adjusting device as recited in claim 1 .

Assignees

• Friedrichs Matthias
• Schaeffler Technologies Ag

Inventors

• Friedrichs Matthias

Classifications

• F01L1/344 Primary

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title

• F01L1/3442

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L1/047

  Camshafts · CPC title

• Y10T29/49293

  Camshaft making · CPC title