Audi Ag

Michael Paul

Wilhelm Hannibal

Klaus Fuoss

Peter Hubschle

Valve gear mechanism for a multi-cylinder internal combustion engine

Multi-cylinder internal combustion engine

Valve-actuating mechanism

Valve actuating mechanism for an internal combustion engine

A valve train with a variable valve timing mechanism for at least one intake or exhaust valve E has a cam shaft with a low-speed cam and a high-speed cam. A first rocker lever interacts with the low-speed cam and the valve E. A second rocker lever interacts with the high-speed cam and can be connected to the first rocker lever via a coupling pin. To press the second rocker lever against its cam, a spring system is provided and this is formed by at least one spring, which, during the base circle phase, rests in a prestressed state directly or indirectly against a fixed stop and the rocker lever is thus relieved of load in order to reduce friction and wear.

Valve train for an internal combustion engine

A valve actuating mechanism for at least one inlet valve or outlet valve which can be alternatively actuated by a low rotational speed cam 2, 3 or a high rotational speed cam 7 by means of a first rocker lever 5 or a second rocker lever 9, includes a coupling pin 12, which is used for coupling the two rocker levers and which is located in a hole 10 of the first rocker lever 5 and can be displaced by a pressure medium against the action of a spring 17 towards the outside into a hole 11 in the second rocker lever 9 when the holes 10 and 11 are aligned with one another. In order to ensure that after it has been subjected to pressure, sufficient time remains for the coupling pin 12 to penetrate completely into the hole 11, a locking element 26 is provided which engages by means of a projection 29 in an annular groove 30 in the pin 12 and holds the latter in its inner position until the second rocker lever 9 presses the spring tongue 26 downwards during its lift phase--because of the motion relative to the first rocker lever 5 occurring because of its lift phase--and presses the projection 29 out of the annular space 30 so that the whole of the next base circle phase is available for the displacement of the pin 12.

A valve actuating mechanism is proposed for an internal combustion engine in which at least one intake valve E is actuatable optionally by a low-speed cam 2 or a high-speed cam. The first rocker lever 5 operates in conjunction with the low-speed cam 2 and the valve E, while the second rocker lever 8,9 operates in conjunction with the high-speed cam 7 and can be connected to the first rocker lever by means of a coupling bolt 12 mounted in a bore 10 of the first rocker lever 5 which is aligned with a bore 11 in the second rocker lever 8, 9 when both rocker levers are riding on the base circles of their cams. The coupling bolt 12 is moved into the coupling position against the force of a spring 17. The spring 17 rests on one side on the end of a pipe 20 connected to the coupling bolt 12 and on the other side on an insert 18 introduced into the bore 10, the pipe 20 extending through this insert 18. In order to achieve brief switching periods, the pipe 20 is provided in the vicinity of the reverse side 31 of the coupling bolt 12 with a cross hole 28 through which quick pressure increase and decrease on the reverse side 30 of the coupling bolt 12 is effected.

Growing community of inventors

Bad Friedrichshall, Germany

Michael Paul