Valve drive train device for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-9759099-B2
Application number	US-201514866872-A
Country	US
Kind code	B2
Filing date	Sep 26, 2015
Priority date	Apr 4, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

In a valve drive train device for an internal combustion engine of motor vehicle, wherein at least one axially movably mounted cam element including at least one cam set with at least two cam parts and a shifting gate with at least two gate track for converting a rotary movement of the cam element into an axial shifting motion, at least one of the cam parts and the adjacent gate track are disposed in an at least partially axially overlapping relationship for reducing thereby the axial length and the mass of the cam element or permitting the use of a larger, highly durable, actuating mechanism.

First claim

What is claimed is:

1. A valve drive train device for an internal combustion engine of a motor vehicle, comprising: a camshaft with at least one axially movably mounted cam element ( 10 ), each axially movably mounted cam element ( 10 ) being provided with at least one cam set ( 11 , 15 ) and each cam set ( 11 , 15 ) including at least two cam parts ( 12 , 13 , 14 ; 16 , 17 , 18 ) and a shifting gate ( 19 ) with at least two gate tracks ( 20 , 21 ) for converting a rotary movement of the at least one axially movably mounted cam element ( 10 ) into an axial shifting motion of the at least one cam element ( 10 ), with at least one of the cam parts ( 14 , 16 ) and at least one of the gate tracks ( 20 , 21 ) being disposed partially in an axially overlapping relationship.

2. The valve drive train device according to claim 1 , wherein the cam part ( 14 , 16 ) has a base circle area, and the gate track ( 20 , 21 ) and a respective cam part ( 14 , 16 ) are disposed axially overlapping in the base circle area of the respective cam part ( 14 , 16 ).

3. The valve drive train device according to claim 2 , wherein an overlap width ( 22 ) of the gate track ( 20 , 21 ) and the respective cam part ( 14 , 16 ) of at least 10% of a cam part width ( 24 ) is provided.

4. The valve drive train device according to claim 2 , wherein an overlap width ( 22 ) of 50% of the gate track ( 20 , 21 ) and the respective a cam part ( 14 , 16 ) is provided.

5. The valve drive train device according to claim 1 , wherein the at least one axially movably mounted cam element ( 10 ) has at least two cam sets ( 11 , 15 ) each with at least two cam parts ( 12 , 13 , 14 ; 16 , 17 , 18 ) and the at least two gate tracks ( 20 , 21 ) of the shifting gate ( 19 ) are disposed axially between the at least two cam sets ( 11 , 15 ).

6. The valve drive train device according to claim 5 , wherein each of the gate tracks ( 20 , 21 ) of the shifting gate ( 19 ) is disposed at least partially axially overlapping with a respective adjacent cam part ( 14 , 16 ) of the respective cam set ( 11 , 15 ).

7. The valve drive train device according to claim 1 , wherein the gate tracks ( 20 , 21 ) each include an engagement segment and, respectively, a disengagement segment at least one of which is disposed axially overlapping with the respective adjacent cam part ( 14 , 16 ).

8. The valve drive train according to claim 1 , wherein each cam set ( 11 , 15 ) has a first cam part ( 12 , 16 ), a second cam part ( 13 , 17 ) and a third cam part ( 14 , 18 ).

9. The valve drive train according to claim 1 , wherein a support shaft ( 23 ) is provided on which the at least one cam element ( 10 ) is non-rotatably but axially displaceably mounted.

10. The valve drive train according to claim 1 , wherein the at least one axially movable cam element ( 10 ) is axially movable by an actuator unit with gate engagement elements for engagement in the respective gate track ( 20 , 21 ) for axially shifting the cam element ( 10 ) upon rotation thereof.

Assignees

• Daimler Ag

Inventors

• Lengfeld Markus
• Meintschel Jens
• Stolk Thomas
• Von Gaisberg-Helfenberg Alexander

Classifications

• F01L1/047 Primary

  Camshafts · CPC title

• F01L1/044 Primary

  Reciprocating cams · CPC title

• F01L13/0036

  the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction · CPC title

• F01L2013/0052

  with cams provided on an axially slidable sleeve · CPC title