Method for producing a built camshaft

Patent metadata

Field	Value
Publication number	US-2016108764-A1
Application number	US-201514883278-A
Country	US
Kind code	A1
Filing date	Oct 14, 2015
Priority date	Oct 15, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

An assembled camshaft and a method for producing an assembled camshaft are disclosed. The assembled camshaft may include a camshaft main body having a longitudinal axis. The camshaft main body may include a first axial section and a second axial section disposed between the first axial section and a third axial section. The second axial section may have an outer profile including a toothing extending in an axial direction. At least one sliding cam may be arranged on the second axial section. A drive wheel may be arranged on a free end of the first axial section, and a receiving element may be arranged on at least one of the first axial section and the third axial section.

First claim

1 . A method for producing an assembled camshaft, comprising the steps of:
having at least one sliding cam, which is arranged on a camshaft main body in a rotationally fixed and axially displaceable manner, having at least one element, which is arranged on the camshaft main body in a rotationally fixed and axially non-displaceable manner, providing a camshaft main body having a longitudinal axis, wherein the camshaft main body includes:
a first axial section having a smooth cylindrical outer profile and an outer diameter d 1 ,
a second axial section disposed between the first axial section and a third axial section, the second axial section including a toothing extending in an axial direction, wherein the second axial section via the toothing defines a tip circle diameter d K and a root circle diameter d F ,
the third axial section having a smooth cylindrical outer profile and an outer diameter d 3 ,
wherein d 1 >d K and d F >d 3 ,
joining a drive wheel to a free end of the first axial section, thermally joining at least one receiving element to the first axial section in a predefined angular and axial position, pushing at least one sliding cam onto the second axial section in a predefined angular position, and thermally joining at least one other receiving element to the third axial section in a predefined angular and axial position.

2 . The method according to claim 1 , wherein providing the camshaft main body further includes pushing the camshaft main body through a hub of the at least one sliding cam and a hub of the receiving elements and through at least one of a passage opening of a bearing frame and a passage opening of a cylinder head cover.

3 . A method for producing an assembled camshaft, comprising the steps of:
providing a camshaft main body having a longitudinal axis, the camshaft main body including:
a first axial section having a smooth cylindrical outer profile and an outer diameter d 1 ,
a second axial section disposed between the first axial section and a third axial section, the second axial section including a toothing extending in an axial direction, wherein the second axial section via the toothing defines a tip circle diameter d K and a root circle diameter d F ,
the third axial section having a smooth cylindrical outer profile and an outer diameter d 3 ,
wherein d 1 <d F and d 3 <d F ,
thermally joining at least one receiving element to the first axial section in a predefined angular and axial position, pushing at least one sliding cam onto the second axial section in a predefined angular position, thermally joining at least one other receiving element to the third axial section in a predefined angular and axial position, and joining a drive wheel to a free end of the first axial section.

4 . The method according to claim 3 , wherein joining the drive wheel to the camshaft main body includes fixing the drive wheel on the first axial section via welding to define at least one of a form fit connection and a shrink fit connection.

5 . The method according to claim 3 , wherein the predefined angular position of at least one of the receiving elements is defined before or after the receiving elements are pushed onto the camshaft main body.

6 . An assembled camshaft, comprising:
a camshaft main body having a longitudinal axis and including:
a first axial section having a smooth cylindrical outer profile and an outer diameter d 1 ;
a second axial section disposed between the first axial section and a third axial section, the second axial section having an outer profile including a toothing extending in an axial direction, wherein the second axial section via the toothing defines a tip circle diameter d K and a root circle diameter d F;
the third axial section having a smooth cylindrical outer profile and an outer diameter d 3 ;
a drive wheel coupled to a free end of the first axial section; at least one receiving element arranged rotationally and axially fixed on the camshaft main body, the at least one receiving element disposed on at least one of the first axial section and the third axial section; and at least one sliding cam arranged rotationally fixed and axially displaceable on the second axial section; wherein the at least one receiving element is thermally joined to the camshaft main body and defines at least one of a form fit connection and a shrink fit connection.

7 . The camshaft according to claim 6 , wherein the at least one receiving element includes at least one of a cam, a sensor wheel, a bearing ring, a rolling bearing and a gearwheel.

8 . The camshaft according to claim 6 , wherein the camshaft main body is a stepped and hollow shaft.

9 . The camshaft according to claim 6 , wherein the at least one receiving element has a hub defining a friction-increasing structure.

10 . The camshaft according to claim 8 , wherein the camshaft main body is stepped at a transition between at least one of (i) the first axial section and the second axial section and (ii) the second axial section and the third axial section.

11 . The camshaft according to claim 6 , wherein the camshaft main body defines the following relationship: d 1 >d K and d F >d 3 .

12 . The camshaft according to claim 6 , wherein the camshaft main body defines the following relationship: d 1 <d F and d 3 <d F .

13 . The method according to claim 1 , wherein joining the drive wheel to the camshaft main body includes fixing the drive wheel on the first axial section via welding to define at least one of a form fit connection and a shrink fit connection.

14 . The method according to claim 13 , wherein welding includes at least one of laser welding and friction welding.

15 . The method according to claim 1 , wherein the predefined angular position of at least one of the receiving elements is defined before or after the receiving elements are pushed onto the camshaft main body.

16 . The method according to claim 1 , wherein the at least one receiving element includes at least one of a cam, a sensor wheel, a bearing ring, a rolling bearing and a gearwheel.

17 . The method according to claim 1 , wherein providing the camshaft main body further includes forming a stepped transition between at least one of (i) the first axial section and the second axial section and (ii) the second axial section and the third axial section.

18 . The method according to claim 3 , wherein providing the camshaft main body further includes forming a stepped transition between at least one of (i) the first axial section and the second axial section and (ii) the second axial section and the third axial section.

19 . The method according to claim 3 , wherein, after providing the camshaft main body, further including the step of pushing the camshaft main body through a hub of the at least one sliding cam and a hub of the receiving elements and through at least one of passage opening of a bearing frame and a passage opening of a cylinder head cover.

20 . The method according to claim 4 , wherein welding includes at least one of laser welding and friction welding.

Assignees

• Mahle Int Gmbh

Inventors

• Leutert Markus
• Schacherer Roland
• Steinmetz Christoph
• Unrath Christoph

Classifications

• F01L2001/0535

  Single overhead camshafts [SOHC] · 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

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F01L2001/0476

  Camshaft bearings · CPC title

• F01L2001/0475

  Hollow camshafts · CPC title