Valve actuating device

Patent metadata

Field	Value
Publication number	US-2016130992-A1
Application number	US-201414896167-A
Country	US
Kind code	A1
Filing date	Jun 17, 2014
Priority date	Jun 18, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

It relates to a valve actuating device ( 4 ) for variable valve control, wherein at least one articulation point ( 16, 18 ) between the valve lever ( 9 ) and the gas exchange valve ( 2, 3 ) or a force transmission element which acts on the gas exchange valve ( 2, 3 ) is configured so as to be adjustable via an adjusting device. In order to make jolt-free valve actuation possible, it is proposed that the adjusting device has a piston ( 13 ) which is mounted displaceably in the valve lever ( 9 ) and adjoins a pressure chamber ( 19, 20 ), wherein a piston rod ( 15 ) which is connected to the piston ( 13 ) is connected in an articulated manner at a first articulation point ( 16 ) to a first end of a push rod ( 17 ), the second end of which is connected in an articulated manner at a second articulation point ( 18 ) to the gas exchange valve ( 2, 3 ) or the force transmission part which acts on the gas exchange valve ( 2, 3 ), with the result that the first articulation point ( 16 ) can be displaced in the longitudinal direction of the piston rod ( 15 ) at least between a first position and a second position.

First claim

1 - 9 . (canceled)

10 . A valve actuating device for variable valve control of at least one gas exchange valve of an internal combustion engine which can be actuated via a camshaft and at least one valve lever, wherein at least one articulation point between the valve lever and the gas exchange valve or a force transmission element which acts on the gas exchange valve is formed to be adjustable via an adjusting device, wherein the adjusting device comprises a piston which is displaceably mounted in the valve lever and adjoins at least one pressure chamber which can be filled with an actuating medium, wherein a piston rod which is connected to the piston is connected in an articulated manner at a first articulation point to a first end of a push rod, the second end of which is connected in an articulated manner at a second articulation point to the gas exchange valve or the force transmission part which acts on the gas exchange valve, so that the first articulation point can be displaced in the longitudinal direction of the piston rod at least between a first position and a second position, wherein the first articulation point is arranged in the first position in the rotational axis of the valve lever.

11 . The valve actuating device according to claim 10 , wherein the first articulation point is arranged in the second position in the region of the longitudinal axis of the gas exchange valve or the force transmission element.

12 . The valve actuating device according to claim 10 , wherein the piston is formed as a double-acting piston, wherein the piston adjoins a first pressure chamber with a first face end and a second pressure chamber with a second face end facing away from the first face end.

13 . The valve actuating device according to claim 10 , wherein the valve lever is pressed by a return spring against the actuating cam of the camshaft.

14 . The valve actuating device according to claim 13 , wherein the actuating cam and the return spring act at different ends on the valve lever.

15 . The valve actuating device according to claim 10 , wherein the valve actuating device comprises one valve lever per gas exchange valve or per gas exchange valve group.

16 . The valve actuating device according to claim 10 , wherein the valve lever is formed as a cam follower.

17 . The valve actuating device according to claim 10 , wherein the force transmission element is formed by a pressure rod of a valve bridge acting on at least two gas exchange valves.

18 . The valve actuating device according to claim 10 , wherein at least one respective pressure channel opens into each pressure chamber.

19 . The valve actuating device according to claim 18 , wherein the pressure chambers are controlled by a common slide valve.

20 . The valve actuating device according to claim 10 , wherein the first articulation point is arranged in a first end position in the rotational axis of the valve lever.

21 . The valve actuating device according to claim 10 , wherein the first articulation point is arranged in a second end position in the region of the longitudinal axis of the gas exchange valve or the force transmission element.

Assignees

• Avl List Gmbh

Inventors

• Melde-Tuczai Helmut
• Hödl Bernhard
• Zurk Andreas

Classifications

• F01L1/185

  Overhead end-pivot rocking arms · CPC title

• F01L13/0021

  by modification of rocker arm ratio · CPC title

• F01L13/0015

  for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque · CPC title

• F01L13/0063 Primary

  by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot · CPC title

• F01L3/10

  Connecting springs to valve members · CPC title