Method for producing an adjustable camshaft and adjustable camshaft

Patent metadata

Field	Value
Publication number	US-2017314427-A1
Application number	US-201515521340-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Oct 24, 2014
Publication date	Nov 2, 2017
Grant date	—

Abstract

An adjustable camshaft, which can be utilized in a motor vehicle, may include at least one fixed cam arranged rotationally fixed on at least one outer shaft segment and at least one adjusting cam arranged rotationally fixed to an inner shaft extending concentrically within the outer shaft segment. A method for producing such an adjustable camshaft may involve arranging an outer shaft segment on an inner shaft, generating a surface modification on a surface of the inner shaft to generate at least one arranging section, arranging a fixed cam on at least one section of the outer shaft segment, and arranging the adjusting cam on the arranging section of the inner shaft.

First claim

1 .- 10 . (canceled)

11 . A method for producing an adjustable camshaft of a motor vehicle, wherein the adjustable camshaft comprises a fixed cam disposed rotationally-fixed on an outer shaft segment and an adjusting cam disposed rotationally-fixed to an inner shaft extending concentrically within the outer shaft segment, the method comprising:
positioning the outer shaft segment on the inner shaft; generating a surface modification on a surface of the inner shaft to generate an arranging section; positioning the fixed cam on a section of the outer shaft segment; and positioning the adjusting cam on the arranging section of the inner shaft.

12 . The method of claim 11 wherein the generation of the surface modification occurs by way of a material elevation.

13 . The method of claim 12 wherein the material elevation is generated by means of rolling.

14 . The method of claim 11 wherein the fixed cam is a first fixed cam and the outer shaft segment is a first outer shaft segment, the method further comprising:
positioning a second fixed cam adjacent to the adjusting cam; and
positioning a second outer shaft segment on the inner shaft adjacent to the second fixed cam, wherein the second fixed cam is disposed on the second outer shaft segment.

15 . The method of claim 11 further comprising connecting the fixed cam to the outer shaft segment in at least one of a force-fitted manner, a form-fitted manner, or a firmly bonded manner.

16 . An adjustable camshaft of a motor vehicle, the adjustable camshaft comprising:
a fixed cam disposed rotationally-fixed on an outer shaft segment; and an adjusting cam disposed rotationally-fixed to an inner shaft extending concentrically within the outer shaft segment, wherein the adjusting cam is at least force-fit connected to an arranging section of the inner shaft extending along a portion of the inner shaft, wherein the arranging section comprises a surface modification of a surface of the inner shaft.

17 . The adjustable camshaft of claim 16 wherein the fixed cam is a first fixed cam, wherein the adjusting cam is disposed between the first fixed cam and a second fixed cam, wherein the first and second fixed cams are configured as single fixed cam elements or as a combined fixed cam element in a double-anvil design.

18 . The adjustable camshaft of claim 16 wherein the outer shaft segment is a first outer shaft segment and the fixed cam is a first fixed cam, the adjustable camshaft further comprising a second outer shaft segment and a second fixed cam, wherein the second fixed cam is disposed rotationally-fixed on the second outer shaft segment.

19 . The adjustable camshaft of claim 16 wherein the outer shaft segment comprises a distal shell surface region with an outer diameter that is smaller in dimension for at least a portion than an outer diameter of a remaining shell surface.

20 . The adjustable camshaft of claim 16 wherein the adjusting cam and the fixed cam are disposed concentrically, wherein a through bore of the fixed cam is larger in dimension than a through bore of the adjusting cam.

21 . An adjustable camshaft of a motor vehicle, the adjustable camshaft comprising:
an inner shaft; an adjusting cam disposed on the inner shaft in a rotatably-fixed manner; a first outer shaft segment through which the inner shaft extends, wherein an end of the first outer shaft segment is adjacent to the adjusting cam; and a first fixed cam disposed on the first outer shaft segment in a rotatably-fixed manner, with the first fixed cam being adjacent to the adjusting cam.

22 . The adjustable camshaft of claim 21 further comprising:
a second outer shaft segment through which the inner shaft extends, wherein an end of the second outer shaft segment is adjacent to the adjusting cam such that the adjusting cam is disposed between the first and second outer shaft segments; and
a second fixed cam disposed on the second outer shaft segment in a rotatably-fixed manner, with the second fixed cam being adjacent to the adjusting cam.

23 . The adjustable camshaft of claim 22 wherein the first and second fixed cams are coupled together.

24 . The adjustable camshaft of claim 23 wherein the adjusting cam is rotatably secured to the first and second fixed cams.

25 . The adjustable camshaft of claim 21 wherein a diameter of a through bore of the first fixed cam is larger than a diameter of a through bore of the adjusting cam.

26 . The adjustable camshaft of claim 21 wherein the adjusting cam is disposed on a material elevation of a surface of the inner shaft.

27 . The adjustable camshaft of claim 21 wherein a thickness of the first outer shaft segment is reduced at a region of the first outer shaft segment that supports the first fixed cam.

28 . The adjustable camshaft of claim 21 wherein a space exists between the first outer shaft segment and the adjusting cam.

29 . The adjustable camshaft of claim 21 further comprising a limiting element disposed between the first outer shaft segment and the adjusting cam.

30 . The adjustable camshaft of claim 22 wherein the adjusting cam and the first fixed cam are disposed concentrically.

Assignees

• Thyssenkrupp Presta Tecct Ag

Inventors

• Brandenburger Henning
• Paeplow Alexander
• Lübberstedt Alexander

Classifications

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F01L13/0057

  by splittable or deformable cams · CPC title

• F01L2303/02

  Initial camshaft settings · 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