Method for producing a camshaft assembly

Patent metadata

Field	Value
Publication number	US-10518377-B2
Application number	US-201515310370-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	May 16, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A method for producing a ready-for-use camshaft for controlling valves of an internal combustion engine may be directed towards camshafts that include a carrier shaft on which an end component, for example, a drive wheel, a phase adjuster, or a part of a phase adjuster, is arranged and cam elements that are attached in a positionally fixed manner to the carrier shaft. In some examples, the method comprises providing a carrier shaft and an end component, joining the end component to the carrier shaft, grinding at least the carrier shaft to form cam seats so as to establish readiness for use, introducing a surface profile into a first cam seat, providing a cam element with ready-for-use characteristics, seating the cam element on the cam seat with the surface profile, and repeating certain steps for additional cam elements.

First claim

What is claimed is:

1. A method for producing a ready-for-use camshaft for controlling valves of an internal combustion engine, the method comprising:
joining an end component to a carrier shaft;
grinding the carrier shaft to form cam seats so as to establish readiness for use, wherein the cam seats are configured to permit passage of cam elements thereover without fixing thereof;
introducing a surface profile into a first cam seat after said grinding step, the first cam seat adjacent the end component;
seating, by pressing, a first cam element with ready-for-use characteristics on the first cam seat with the surface profile such that the first cam element is attached in a positionally fixed manner to the carrier shaft;
repeating the introducing and seating steps for a second cam seat and a second cam element, wherein the second cam seat is axially farther away from the end component relative to the first cam seat,
clamping the end component by way of a tailstock positioned at a side of the carrier shaft opposite the end component for the introducing the surface profile into the first cam seat and for the seating of the first cam element on the first cam seat, and
guiding the first and second cam elements over the tailstock such that the tailstock remains positioned on the carrier shaft as the first and second cam elements are seated on the carrier shaft.

2. The method of claim 1 wherein the end component is a drive wheel, a phase adjuster, or a part of a phase adjuster.

3. The method of claim 1 wherein the grinding comprises machining of the end component so as to establish readiness for use.

4. The method of claim 1 wherein the grinding comprises grinding machining of the end component so as to establish readiness for use.

5. The method of claim 1 wherein the grinding comprises machining of the cam seats and finish machining of bearing points formed on the carrier shaft between or adjacent to the cam seats.

6. The method of claim 1 wherein the grinding of the carrier shaft to establish readiness for use is performed on a grinding installation, wherein at least the introducing the surface profile and the seating of the first cam element are performed on a cam seating installation.

7. The method of claim 1 further comprising:
at least one of
grinding the first and second cam elements, respectively, to final dimensions before seating the first and second cam elements on the carrier shaft, or
subjecting the first and second cam elements, respectively, to surface finish machining before seating the first and second cam elements on the carrier shaft; and

orienting the first and second cam elements rotationally so as to correspond, respectively, to orientations of the first and second cam seats on the carrier shaft before seating the first and second cam elements on the carrier shaft.

8. The method of claim 1 further comprising coating the first and second cam elements before seating the first and second cam elements on the carrier shaft.

9. The method of claim 1 further comprising grinding bores in the first and second cam elements that have diameters that are larger, respectively, than diameters of the first and second cam seats.

10. The method of claim 1 wherein a roller-burnishing tool is used to introduce the surface profile into the first cam seat.

11. A method for producing a ready-for-use camshaft for controlling valves of an internal combustion engine, the method comprising:
joining an end component to a carrier shaft;
grinding the carrier shaft to form a first cam seat, wherein the cam seat is configured to permit passage of cam elements thereover without engagement thereof;
introducing a surface profile into the first cam seat, wherein the first cam seat is adjacent the end component;
seating, by pressing, a first cam element on the first cam seat such that the first cam element is fixed to the carrier shaft,
repeating the grinding, introducing, and seating steps for a second cam seat and a second cam element, wherein the second cam seat is axially farther away from the end component relative to the first cam seat;
clamping the end component by way of a tailstock positioned at a side of the carrier shaft opposite the end component for introducing the surface profile into the first cam seat and for seating the first cam element on the first cam seat, and
guiding the first cam element and the second cam element over the tailstock such that the tailstock remains positioned on the carrier shaft as the first and second cam elements are seated on the carrier shaft.

12. The method of claim 11 wherein the grinding comprises machining the first cam seat and finish machining bearing points formed on the carrier shaft between the first cam seat and a second cam seat or adjacent to the first cam seat.

13. The method of claim 11 wherein the grinding of the carrier shaft is performed on a grinding installation, wherein at least the introducing the surface profile and the seating of the first cam element are performed on a cam seating installation.

14. The method of claim 11 further comprising coating the first cam element before seating the first cam element on the carrier shaft.

Assignees

• Thyssenkrupp Presta Tecct Ag

Inventors

• Muster Manfred
• Curlic Marko
• Pfitscher Aaron
• Wiesner Peter
• Hollweque Nicolas
• Schätzle Jörg
• Danthois Martial
• Höber Raphael

Classifications

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F01L2001/0471

  Assembled camshafts · CPC title

• F16D1/072

  involving plastic deformation (plastic welding F16D1/068) · CPC title

• F01L1/047

  Camshafts · CPC title

• B24B19/12 Primary

  for grinding cams or camshafts · CPC title