Bayerische Motoren Werke Aktiengesellschaft

B Ayerische M Otoren W Erke a Ktiengesellschaft

Gert Fischer

Johannes Hoehl

Michael Bidlingmaier

Stefan Foester

A valve timing gear of an internal-combustion engine is provided, in the case of which a camshaft acts by a timing cam upon a valve by way of a tappet whose cam-side contact path can be changed by a control device for changing the valve opening period. For achieving a small-sized control device, this control device comprises a slider rocker guided in the valve lifting direction by way of a first sliding hinge joint arranged on an engine section side and an additional sliding hinge joint provided on the tilting segment side, with a control opening penetrated with play by a timing-cam-free section of the camshaft. An element, which can be operated in a controlled manner, of an adjusting device is arranged in/on the camshaft, while rotating with it, and being applied such to the circumference of the control opening that the adjustable slider rocker, while the camshaft is rotating, carries out for each valve lift a periodic rocking movement which is used for forcibly controlling the tilting segment.

Valve timing system for an internal combustion engine

For a variable valve operating mechanism for an internal-combustion engine having variable valve lifts, which can be achieved at constant opening angles, variable valve opening angles are achieved in the case of particularly small valve lifts. To do so, the rocker axis of a valve lever, which is essentially parallel to the axis of rotation of the camshaft, can be dynamically displaced relative to a camshaft along a path in a controlled manner such that, when the rocker axis is displaced, the valve lever is activated for the valve operation by way of a roller which is controlled only approximately from the starting area to the end area of a cam tip of a radial cam on the camshaft.

Variable valve operating mechanism for an internal combustion engine

Hypocycloidal crank mechanism for piston engines, engines especially for

Piston engine having a hypocycloidal piston stroke transmission with a

Reciprocating piston engine with adjacent cylinders in the crankshaft

The invention provides a variable valve gear for internal-combustion engines, in which a control cam of a camshaft acts by way of an interconnected roller onto a swivellable or tiltable valve lever for actuating an upper valve, for achieving a continuous valve timing and stroke adjustment of the upper valve. In the case of a minimal stroke, the roller, by way of an adjustably controlled adjusting lever is positioned in the outer end area of this valve lever and is guided to be swivellable transversely to the cam lift of the control cam.

Variable valve gear, particularly for internal-combustion engines

Reciprocating piston engine, especially internal combustion engine, with

An internal combustion engine has a camshaft with control cams which act on respective valves through a transmission member whose contact path on the cam side is variable in its position relative to the control cam via a control device for changing the valve opening period with a valve lift that is essentially constant. To achieve exact control, the contact path is formed on a roller, which is forcibly controlled relative to the drag lever in synchronization with the camshaft, as an intermediate element between the control cams and the drag lever.

Valve control for an internal combustion engine

For a hypocycloidal crank transmission for piston engines, particularly internal-combustion engines, having a lift/guide shaft rotatably arranged in crank webs of a main crankshaft which are rotatably connected in a synchronous manner and having lift eccentrics for an oscillatingly driven piston connecting rod controlled by way of an orthogonal straight-motion mechanism, it is suggested for achieving a one-piece lift/guide shaft that this lift/guide shaft have, as a shaft-side guiding element of the hypocycloidal straight-motion mechanism, a guide eccentric or an eccentric guide pin.

Growing community of inventors

Feldafing, Germany

Gert Fischer