Valve drive device

Patent metadata

Field	Value
Publication number	US-10794233-B2
Application number	US-201816606606-A
Country	US
Kind code	B2
Filing date	Apr 11, 2018
Priority date	Apr 20, 2017
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A valve drive device, in particular for an internal combustion engine, includes a support element fixed to a housing and at least one axially shiftable cam unit allocated to a valve. The cam unit has at least three cam tracks. At least one switching unit which is a displacement body is provided to displace at least one part of the cam unit in the direction of a first actuation direction for axial shifting. The displacement body displaces at least one part of the cam unit in the direction of a second actuation direction opposing the first actuation direction.

First claim

The invention claimed is:

1. A valve drive device, comprising:
an axially shiftable cam unit allocated to a valve, wherein the cam unit has at least three cam tracks; and
a switching unit, wherein the switching unit includes a displacement body, wherein the cam unit is displaceable in a first actuation direction and in a second actuation direction by the displacement body, and wherein the first actuation direction is opposite the second actuation direction;
wherein the displacement body has at least two contact surfaces;
wherein the at least two contact surfaces are angled in relation to each other.

2. The valve drive device according to claim 1 , wherein the cam unit is allocated to at least two valves.

3. The valve drive device according to claim 1 further comprising a shifting element, wherein the switching unit is adjustable by the shifting element.

4. The valve drive device according to claim 3 , wherein the shifting element has at least three shifting positions.

5. The valve drive device according to claim 1 , wherein a width of the displacement body is substantially double a width of a cam track of the at least three cam tracks.

6. The valve drive device according to claim 1 , wherein the cam unit has at least two displacement contours formed to correspond to the displacement body.

7. The valve drive device according to claim 6 , wherein the at least two displacement contours are formed as respective edges of a groove in the cam unit.

8. A method for operating a valve drive device according to claim 1 .

Assignees

• Daimler Ag

Inventors

• Stolk Thomas
• Von Gaisberg-Helfenberg Alexander

Classifications

• F01L2013/10

  Auxiliary actuators for variable valve timing · CPC title

• F01L13/0005

  Deactivating valves · CPC title

• F01L1/047 Primary

  Camshafts · CPC title

• F01L13/0036 Primary

  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

• 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