Force transmission device for variable valve drive

Patent metadata

Field	Value
Publication number	US-10895175-B2
Application number	US-201816104507-A
Country	US
Kind code	B2
Filing date	Aug 17, 2018
Priority date	Aug 18, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A force transmission device for a variable valve drive of an internal combustion engine. The force transmission device has a first lever device. The first lever device has a first cam follower and a first receptacle for the first cam follower. The first cam follower is displaceable and lockable in the first receptacle. The force transmission device has a second lever device. The second lever device has a second cam follower and a second receptacle for the second cam follower. The second cam follower is displaceable and lockable in the second receptacle.

First claim

I claim:

1. A force transmission device for a variable valve drive of an internal combustion engine with at least one gas exchange valve and with a camshaft having a first cam and a second cam, the force transmission device comprising:
a first lever device configured to produce an operative connection between the first cam and the at least one gas exchange valve, wherein the first lever device has a first cam follower configured to contact the first cam and a first receptacle for the first cam follower, the first cam follower configured to be alternately displaceable or locked within the first receptacle, wherein the first lever device has at least one hydraulically-displaceable blocking piston configured to lock the first cam follower; and
a second lever device configured to produce an operative connection between the second cam and the at least one gas exchange valve, wherein the second lever device has a second cam follower configured to contact the second cam and a second receptacle for the second cam follower, the second cam follower configured to be alternately displaceable or locked within the second receptacle.

2. The force transmission device according to claim 1 , wherein:
the first cam follower configured to be displaceable within the first receptacle compensates a cam contour of the first cam, and the first cam follower configured to be locked within the first receptacle transmits the cam contour of the first cam to the at least one gas exchange valve; or
the second cam follower configured to be displaceable within the second receptacle compensates a cam contour of the second cam, and the second cam follower configured to be locked within the second receptacle transmits the cam contour of the second cam to the at least one gas exchange valve.

3. The force transmission device according to claim 1 , wherein:
the first cam follower or the second cam follower is selectively locked; or the first cam follower or the second cam follower is configured to be hydraulically locked.

4. The force transmission device according to claim 1 , wherein:
the first lever device has a rotational securing means which prevents a rotation of the first cam follower about a displacement axis of the first cam follower; or
the second lever device has a rotational securing means which prevents a rotation of the second cam follower about a displacement axis of the second cam follower.

5. The force transmission device according to claim 1 , wherein:
the at least one hydraulically-displaceable blocking piston is elastically preloaded; or
a rotational securing means is provided for the at least one hydraulically-displaceable blocking piston, which rotational securing means prevents a rotation of the at least one hydraulically-displaceable blocking piston about a displacement axis of the at least one hydraulically-displaceable blocking piston.

6. The force transmission device according to claim 1 , wherein the second lever device has a hydraulic pressure chamber configured to lock the second cam follower.

7. The force transmission device according to claim 6 , wherein:
the at least one hydraulically-displaceable blocking piston and the hydraulic pressure chamber are configured to be jointly loaded; or
a common lever axle of the first lever device and of the second lever device supplies a control fluid to the first cam follower and the second cam follower.

8. The force transmission device according to claim 7 , wherein the common lever axle is a rocker lever axle.

9. The force transmission device according to claim 7 , wherein the common lever axle includes a lever axle longitudinal channel.

10. The force transmission device according to claim 6 , wherein:
a displacement movement of the first cam follower is enabled in a presence of hydraulic loading of the at least one hydraulically-displaceable blocking piston; or
a locking of the first cam follower is enabled in an absence of hydraulic loading of the at least one hydraulically-displaceable blocking piston; or
a locking of the second cam follower is enabled in the presence of hydraulic loading of the hydraulic pressure chamber; or
a displacement movement of the second cam follower is enabled in an absence of hydraulic loading of the hydraulic pressure chamber.

11. The force transmission device according to claim 1 , wherein
the first cam follower is mounted in a first actuating piston configured to be axially displaceable in the first receptacle; or
the second cam follower is mounted in a second actuating piston configured to be axially displaceable in the second receptacle.

12. A force transmission device for a variable valve drive of an internal combustion engine with at least one gas exchange valve and with a camshaft having a first cam and a second cam, the force transmission device comprising:
a first lever device configured to produce an operative connection between the first cam and the at least one gas exchange valve, wherein the first lever device has a first cam follower configured to contact the first cam and a first receptacle for the first cam follower, the first cam follower configured to be alternately displaceable or locked within the first receptacle; and
a second lever device configured to produce an operative connection between the second cam and the at least one gas exchange valve, wherein the second lever device has a second cam follower configured to contact the second cam and a second receptacle for the second cam follower, the second cam follower configured to be alternately displaceable or locked within the second receptacle,
wherein the first lever device is formed as a center-pivot rocker lever, or the second lever device is formed as a center-pivot rocker lever.

13. A force transmission device for a variable valve drive of an internal combustion engine with at least one gas exchange valve and with a camshaft having a first cam and a second cam, the force transmission device comprising:
a first lever device configured to produce an operative connection between the first cam and the at least one gas exchange valve, wherein the first lever device has a first cam follower configured to contact the first cam and a first receptacle for the first cam follower, the first cam follower configured to be alternately displaceable or locked within the first receptacle; and
a second lever device configured to produce an operative connection between the second cam and the at least one gas exchange valve, wherein the second lever device has a second cam follower configured to contact the second cam and a second receptacle for the second cam follower, the second cam follower configured to be alternately displaceable or locked within the second receptacle,
wherein the second lever device is supported on the first lever device via a play setting device.

14. A force transmission device for a variable valve drive of an internal combustion engine with at least one gas exchange valve and with a camshaft having a first cam and a second cam, the force transmission device comprising:
a first lever device configured to produce an operative connection between the first cam and the at least one gas exchange valve, wherein the first lever device has a first cam follower configured to contact the first cam and a first receptacle for the first cam follower, the first cam follower configured to be alternately displaceable or locked within the first receptacle; and
a second lever device configured to produce an operative connection between the second cam and the at least one gas exchange valve, wherein the second lever device has a second cam follower configured to contact the second cam an

Assignees

• Man Truck & Bus Ag

Inventors

• Bogdanski Peter

Classifications

• F01L2305/02

  Mounting of rollers · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L2001/186

  Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison · CPC title

• F01L13/06

  for braking · 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