Camshaft for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10677105-B2
Application number	US-201716467801-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	Dec 10, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A camshaft for an internal combustion engine has a fundamental shaft which has a first toothing designed as external toothing and has at least one cam element which is arranged on the fundamental shaft and has a second toothing designed as internal toothing, The cam element can be displaced in the axial direction relative to the fundamental shaft and is connected to the fundamental shaft in a rotationally fixed manner via the toothings. At least one of the toothings has teeth whose respective tooth width varies in the axial direction of the fundamental shaft.

First claim

The invention claimed is:

1. A camshaft for an internal combustion engine, the camshaft comprising:
a fundamental shaft which has a first toothing constructed as external toothing; and
a cam element which is disposed on the fundamental shaft and which has a second toothing constructed as internal toothing, wherein the cam element is configured to be displaced in an axial direction relative to the fundamental shaft and is connected to the fundamental shaft in a rotationally fixed manner via the external toothing and the internal toothing;
wherein at least one of the external toothing and the internal toothing has teeth with a respective tooth width that varies in the axial direction;
wherein the teeth each have at least one length range which widens wedge-shaped in the axial direction.

2. The camshaft according to claim 1 , wherein the teeth each have a first contact region in which the tooth width has a first value and a second contact region following the first contact region in the axial direction in which the tooth width has a second value which is greater than the first value.

3. The camshaft according to claim 2 , wherein the cam element is configured to be displaced in the axial direction between a first position and a second position relative to the fundamental shaft, wherein the external toothing and the internal toothing in the first position are in mutual contact via the first contact region, wherein the external toothing and the internal toothing in the second position are in mutual contact via the second contact region, wherein the cam element has a first cam configured to effect a first stroke of a gas exchange valve of the internal combustion engine and a second cam configured to effect a second stroke of the gas exchange valve, wherein the second stroke is greater than the first stroke, and wherein the gas exchange valve is actuated in the first position by the first cam and in the second position by the second cam.

Assignees

• Daimler Ag

Inventors

• Gramkow Thomas
• Wuensch Markus

Classifications

• F16H53/04

  Adjustable cams · CPC title

• F01L2001/0473

  Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod · CPC title

• F01L1/047 Primary

  Camshafts · CPC title

• F16D3/06

  specially adapted to allow axial displacement · CPC title

• F01L2810/04

  Reducing noise · CPC title