Method for producing a constructed camshaft of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-11267086-B2
Application number	US-201716307420-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Jun 7, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A method for producing a constructed camshaft of an internal combustion engine may be used in connection with a camshaft having a cam, a shaft, and an anti-friction bearing. The method may involve machining the cam, machining the shaft to produce a setting region for arranging the cam, heating the cam and the anti-friction bearing, pushing the cam onto the shaft into a preliminary position and pushing the anti-friction bearing onto the shaft into a bearing position, equalizing a temperature between the shaft, the cam, and the anti-friction bearing by cooling at least the cam, and setting the cam onto an end position by way of pushing the cam onto the setting region.

First claim

What is claimed is:

1. A method for producing a constructed camshaft of an internal combustion engine, the camshaft comprising a cam, a shaft, and an anti-friction bearing, wherein the method comprises:
machining the cam, wherein machining the cam comprises grinding such that the cam is ready for use;
machining the shaft to produce a setting region for arranging the cam;
heating the cam and the anti-friction bearing;
pushing the cam onto the shaft into a preliminary position, and pushing the anti-friction bearing onto the shaft into a bearing position;
equalizing a temperature between the shaft, the cam, and the anti-friction bearing by cooling at least the cam; and
setting the cam onto an end position by way of pushing the cam onto the setting region.

2. The method of claim 1 comprising machining the shaft to produce a bearing region for the anti-friction bearing using a same machining technique that is used to produce the setting region.

3. A method for producing a constructed camshaft of an internal combustion engine, the camshaft comprising a cam, a shaft, and an anti-friction bearing, wherein the method comprises:
machining the cam;
machining the shaft to produce a setting region for arranging the cam;
heating the cam and the anti-friction bearing;
pushing the cam onto the shaft into a preliminary position, and pushing the anti-friction bearing onto the shaft into a bearing position;
equalizing a temperature between the shaft, the cam, and the anti-friction bearing by cooling at least the cam; and
setting the cam onto an end position by way of pushing the cam onto the setting region,
wherein during the step of pushing the anti-friction bearing onto the shaft into a bearing position, the method comprises positioning on the shaft a spacer element on both sides of the anti-friction bearing.

4. The method of claim 3 comprising cooling the shaft before heating the cam and the anti-friction bearing.

5. The method of claim 3 comprising cooling the shaft after heating the cam and the anti-friction bearing.

6. The method of claim 3 wherein equalizing the temperature between the shaft, the cam, and the anti-friction bearing comprises heating the shaft.

7. The method of claim 3 wherein machining the shaft to produce the setting region comprises forming an elevation on an outer surface of a circumferential face of the shaft.

8. The method of claim 3 wherein machining the shaft comprises producing a bearing region for arranging the anti-friction bearing on the shaft.

9. The method of claim 8 wherein the bearing region is produced by forming an elevation on an outer surface of a circumferential face of the shaft.

10. The method of claim 9 wherein the elevation is formed by roll forming or grinding.

11. The method of claim 3 comprising directly heating the spacer elements with the cam and the anti-friction bearing prior to positioning the spacer elements on the shaft.

12. The method of claim 3 wherein prior to machining the shaft to produce the setting region, the method comprises connecting the shaft to an end piece.

13. The method of claim 3 wherein machining the cam comprises grinding such that the cam is ready for use.

14. The method of claim 3 wherein the anti-friction bearing is a cylindrical roller bearing.

15. The method of claim 3 wherein the anti-friction bearing is a needle bearing with an inner ring.

16. The method of claim 3 comprising machining the shaft to produce a bearing region for the anti-friction bearing using a same machining technique that is used to produce the setting region.

17. The method of claim 3 comprising machining the shaft to produce a bearing region for the anti-friction bearing using a machining technique that is different than a machining technique that is used to produce the setting region.

Assignees

• Thyssenkrupp Presta Tecct Ag
• Thyssenkrupp Ag

Inventors

• Meier Alex

Classifications

• B23P11/025 Primary

  by using heat or cold · CPC title

• F01L2001/0475

  Hollow camshafts · CPC title

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F16C35/063

  Fixing them on the shaft (with interposition of an element F16C35/07) · CPC title

• F01L1/047

  Camshafts · CPC title