Camshaft with an axially displaceable cam pack

Patent metadata

Field	Value
Publication number	US-9273765-B2
Application number	US-201214130143-A
Country	US
Kind code	B2
Filing date	Jun 29, 2012
Priority date	Jun 30, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A camshaft includes a carrier shaft to be mounted rotatably in a shaft axis and at least one cam pack axially displaceable on the carrier shaft. The cam pack includes at least two cams and at least one adjusting member for axial adjustment of the cam pack. The cams and adjusting member are interconnected in an axially adjacent configuration by an integrally molded body. The body is integrally molded on at least one cam and the adjusting member by an original molding process and a composite structure is formed by the integrally molded body. The composite structure can be mounted in a direct configuration on the carrier shaft to be axially displaceable thereon. The cams and the adjusting member include inner toothing engaging in an axially displaceable manner with outer toothing of the carrier shaft. A cam pack and a method for producing a camshaft are also provided.

First claim

The invention claimed is:

1. A camshaft comprising:
a carrier shaft configured to be mounted for rotation along a shaft axis;
at least one cam pack configured to be axially displaced on said carrier shaft, said at least one cam pack including at least two cams and at least one adjusting member configured to axial adjust said at least one cam pack;
an integrally molded body configured to interconnect said cams and said at least one adjusting member in an axially adjacent configuration, said integrally molded body being integrally molded on at least one of said cams and said at least one adjusting member by an original molding process;
a composite structure formed by said integrally molded body, said composite structure configured to be mounted in a direct configuration on said carrier shaft and be axially displaceable on said carrier shaft; and
said carrier shaft having an outer toothing and said cams having an inner toothing engaging in an axially displaceable manner with said outer toothing.

2. The camshaft according to claim 1 , wherein said integrally molded body is integrally cast as an injection molding or a die-casting on at least one of said cams and on said at least one adjusting member.

3. The camshaft according to claim 2 , wherein said integrally molded body is formed of a material including aluminum, magnesium or plastic.

4. The camshaft according to claim 1 , wherein said at least one cam pack includes at least one bearing element.

5. The camshaft according to claim 4 , wherein said at least one bearing element is configured to form a zero-lift cam.

6. A camshaft comprising:
a carrier shaft configured to be mounted for rotation along a shaft axis;
at least one cam pack configured to be axially displaced on said carrier shaft, said at least one cam pack including at least two cams and at least one adjusting member configured to axial adjust said at least one cam pack;
an integrally molded body configured to interconnect said cams and said at least one adjusting member in an axially adjacent configuration, said integrally molded body being integrally molded on at least one of said cams and said at least one adjusting member by an original molding process;
a composite structure formed by said integrally molded body, said composite structure configured to be mounted in a direct configuration on said carrier shaft and be axially displaceable on said carrier shaft;
said carrier shaft having an outer toothing and said cams having an inner toothing engaging in an axially displaceable manner with said outer toothing; and
said cams and said at least one adjusting member having respective end faces and being connected to one another by connections at least over partial regions of said respective end faces.

7. The camshaft according to claim 6 , wherein said connections are firmly bonded connections.

8. The camshaft according to claim 7 , wherein said firmly bonded connections are weld joints, solder joints or adhesive joints.

9. The camshaft according to claim 8 , wherein said weld joints are disposed on at least one of outer peripheries or inner peripheries of said cams and said at least one adjusting member.

10. A camshaft comprising:
a carrier shaft configured to be mounted for rotation along a shaft axis;
at least one cam pack configured to be axially displaced on said carrier shaft, said at least one cam pack including at least two cams and at least one adjusting member configured to axial adjust said at least one cam pack;
an integrally molded body configured to interconnect said cams and said at least one adjusting member in an axially adjacent configuration, said integrally molded body being integrally molded on at least one of said cams and said at least one adjusting member by an original molding process;
a plurality of said cams forming at least one multiple cam element, and said at least one multiple cam element being connected to said at least one adjusting member by said integrally molded body in an axially adjacent configuration with respect to said at least one adjusting member;
a composite structure formed by said integrally molded body, said composite structure configured to be mounted in a direct configuration on said carrier shaft and be axially displaceable on said carrier shaft;
said carrier shaft having an outer toothing and said cams having an inner toothing engaging in an axially displaceable manner with said outer toothing;
said at least one adjusting member having at least two parts including a first part formed by a control contour element and a second part formed by said integrally molded body; and
said control contour element being ring-shaped, said at least one multiple cam element including at least one jointing section introduced at least partially into said ring-shaped control contour element, and said integrally molded body connecting said at least one jointing section and said control contour element to one another.

11. The camshaft according to claim 10 , which further comprises a form-locking shoulder disposed on said at least one jointing section and forming a form-locking connection between said at least one adjusting member and said at least one multiple cam element with said integrally molded body, at least in direction of said shaft axis.

12. The camshaft according to claim 10 , wherein said at least one jointing section has holes formed therein in which material of said integrally molded body engages in a form-locking manner.

13. The camshaft according to claim 10 , wherein:
said at least one multiple cam element includes a first multiple cam element with a first jointing section disposed on a first side of said control contour element and a second multiple cam element with a second jointing section disposed on a second, opposite side of said control contour element; and
said first and second multiple cam elements are connected to one another by said integrally molded body.

14. The camshaft according to claim 13 , wherein said control contour element is embedded in said integrally molded body to form said at least one adjusting member.

15. A cam pack, comprising:
at least two cams;
at least one adjusting member configured to axially adjust the cam pack on a carrier shaft having an outer toothing;
said cams having an inner toothing configured to engage in an axially displaceable manner with the outer toothing of the carrier shaft;
an integrally molded body interconnecting said cams and said at least one adjusting member in an axially adjacent configuration, said integrally molded body being integrally molded on at least one of said cams and said at least one adjusting member by an original molding process; and
a composite structure formed by said integrally molded body and configured for direct configuration on the carrier shaft.

16. A method for producing a camshaft, the method comprising the following steps:
providing a carrier shaft configured to be mounted for rotation along a shaft axis and having an outer toothing;
providing at least one cam pack including at least two cams and at least one adjusting member configured to axially adjust the at least one cam pack;
placing the at least one cam pack axially displaceably on the carrier shaft;
placing at least two of the cams in a position adjacent the at least one adjusting member;
integrally molding a body on at least one of the cams and the at least one adjusting member by an original molding process, forming a composite structure including the at least one cam and the at least one adjusting member;
placing the composite structure directly on the carrier shaft; and

Assignees

• Binder Thomas
• Wiesner Peter
• Thyssenkrupp Presta Tecct Ag

Inventors

• Binder Thomas
• Wiesner Peter

Classifications

• F01L2013/0052

  with cams provided on an axially slidable sleeve · 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

  Camshafts · CPC title

• F16H25/10 Primary

  with adjustable throw · CPC title

• F16H25/08

  for interconverting rotary motion and reciprocating motion (F16H23/00 takes precedence) · CPC title