Camshaft

Patent metadata

Field	Value
Publication number	US-9388713-B2
Application number	US-201314415525-A
Country	US
Kind code	B2
Filing date	Jul 18, 2013
Priority date	Jul 18, 2012
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A camshaft for an internal combustion engine may include a shaft and at least one component thermally joined thereto. The at least one component may be connected via a component-side joining face to a shaft-side joining face of the shaft. At least one of the component-side joining face and the shaft-side joining face may include a predefined roughness introduced and hardened via a laser. The predefined roughness may define at least one track composed of a plurality of individual laser spots. Each of the plurality of individual laser spots may include a center point arranged offset to each other. The plurality of individual laser spots may respectively be arranged to overlapping each other.

First claim

The invention claimed is:

1. A camshaft for an internal combustion engine, comprising: shaft and at least one component thermally joined thereto, the at least one component connected via a component-side joining face to a shaft-side joining face of the shaft,
wherein at least one of the component-side joining face and the shaft-side joining includes a predefined roughness introduced and hardened via a laser,
the predefined roughness defining at least one track composed of a plurality of individual laser spots, wherein each of the plurality of individual laser spots include a centre arranged offset to each other, and wherein the plurality of individual laser spots are respectively arranged overlapping each other.

2. The camshaft according to claim 1 , wherein the at least one component is composed of a metal having a carbon content of at least 0.4% by weight, whereas the shaft has a lower carbon content.

3. The camshaft according to claim 2 , wherein the at least one component is composed of at least one of a C60 steel, a 100Cr6 steel and a sintered material.

4. The camshaft according to claim 3 , wherein the shaft includes a carbon-rich material having a carbon content of at least 0.4% by weight.

5. The camshaft according to claim 1 , wherein the shaft is at least one of carburised before introducing the roughness via the laser and composed of a carbon-rich material having a carbon content of at least 0.4% by weight.

6. The camshaft according to claim 5 , wherein the predefined roughness is Rz 2 to 25.

7. The camshaft according to claim 6 , wherein the at least one component includes at least one of a cam, a signal transmitter wheel, a chain wheel, a belt wheel, a gearwheel, a plug, a drive element, an output element, a tool interface, a setting element, an alignment element, an assembly aid element, a bearing ring and a bearing bushing.

8. The camshaft according to claim 1 , wherein the shaft is composed of at least one of a E335 steel and a C60E steel, and the at least one component is composed of at least one of a C60 steel, a 100Cr6 steel and a sintered material.

9. The camshaft according to claim 1 , wherein the predefined roughness is Rz 2 to 25.

10. The camshaft according to claim 1 , wherein the at least one component includes at least one of a signal transmitter wheel, a chain wheel, a belt wheel, a plug, a gearwheel, a drive element, a tool interface, a setting element, an alignment element, an assembly aid element, a bearing ring, a bearing bushing and a cam.

11. The camshaft according to claim 1 , wherein at least one of:
the predefined roughness defines a plurality of tracks, the respective tracks being oriented at least one of parallel, transversely and obliquely to a shaft axis, and
the component-side joining face and the shaft-side joining face have a different roughness.

12. The camshaft according to claim 1 , further comprising a structural element attached to the at least one component via at least one of a second component-side joining face arranged on the component and a structural-element-side joining face arranged on the structural element in contact with each other when the structural element, wherein at least one of the component-side joining face and the structural-element-side joining face include a roughness introduced and hardened via a laser, the roughness defining a track composed of a plurality of individual laser spots, wherein each of the plurality of individual laser spots have a centre points arranged offset to each other, wherein the plurality of individual laser spots are respectively arranged overlapping each other.

13. The camshaft according to claim 12 , wherein at least one of the component-side joining face, the shaft-side joining face and the structural-element-side joining face is arranged on at least one of an end face and a circumferential face of the shaft, the component and the structural element, respectively.

14. A component for a camshaft, comprising: a component-side joining face including a predefined roughness introduced and hardened via a laser, the predefined roughness defining at least one track, the at least one track being composed of a plurality of individual laser spots, the plurality of individual laser spots each having a centre point arranged offset to each other, wherein the plurality of individual laser spots are respectively arranged overlapping each other.

15. The component according to claim 14 , wherein the component-side joining face is composed of a metal having a carbon content of at least 0.4% by weight.

16. The component according to claim 14 , wherein the component-side joining face is composed of at least one of a C60 steel, a 100Cr6 steel and a sintered material.

17. The component according to claim 14 , wherein the predefined roughness ranges from Rz 2 to 25.

18. The component according to claim 14 , wherein the predefined roughness defines a plurality of tracks, wherein the respective tracks are oriented at least one of parallel, transversely and obliquely to an axis of rotation.

19. The component according to claim 18 , wherein the predefined roughness is Rz 2 to 25.

20. A camshaft for an internal combustion engine, comprising:
a shaft defining a shaft-side joining face, the shaft being composed of a carbon-rich material having a carbon content of at least 0.4% by weight;
at least one component defining a component-side joining face, the at least one component being thermally joined via the component-side joining face to the shaft-side joining face of the shaft;
wherein the component-side joining face and the shaft-side joining face respectively include a predefined roughness ranging from 2 to 25 Rz introduced via a laser, wherein the predefined roughness of the component-side joining face and the shaft-side joining face respectively defines a plurality of tracks each being composed of a plurality of individual laser spots arranged overlapping each other, and the plurality of individual laser spots each including a centre point arranged offset from one another;
wherein the plurality of tracks defined on the component-side joining face and the shaft-side joining face are respectively oriented at least one of parallel, transversely and obliquely to a shaft axis.

Assignees

• Mahle Int Gmbh

Inventors

• Lettmann Markus
• Rieger Ralf
• Schneider Falk

Classifications

• B23K26/3584

  Increasing rugosity, i.e. roughening · CPC title

• F01L1/047 Primary

  Camshafts · CPC title

• B21D53/845

  Making camshafts · CPC title

• B23P2700/02

  Camshafts · CPC title

• B23P11/025

  by using heat or cold · CPC title