Abstract: The invention relates to a crankshaft (1) for a reciprocating internal combustion engine, in which the connecting rods are mounted, with an eccentric sleeve (4) connected in between, on the crankshaft journal (3) of a crankshaft (1). A rotation of the eccentric sleeve (4) with respect to the crankshaft journal (3) therefore leads to a change in the effective length of the connecting rod. The rotation of the sleeve (4) is brought about via an electric or hydraulic motor (7) which drives a worm (6) which engages in an outer toothing (5) of the sleeve (4). By means of the active drive, rotation of the sleeve (4) is ensured even if the auto-rotation is impaired due to the occurrence of wear. Furthermore, a self-locking design of the worm gear has the effect of the sleeve (4) being retained in its set position when the drive (7) is switched off.

Abstract: The invention relates to a crankshaft (1) for a reciprocating internal combustion engine, in which the connecting rods are mounted, with an eccentric sleeve (4) connected in between, on the crankshaft journal (3) of a crankshaft (1). A rotation of the eccentric sleeve (4) with respect to the crankshaft journal (3) therefore leads to a change in the effective length of the connecting rod. The rotation of the sleeve (4) is brought about via an electric or hydraulic motor (7) which drives a worm (6) which engages in an outer toothing (5) of the sleeve (4). By means of the active drive, rotation of the sleeve (4) is ensured even if the auto-rotation is impaired due to the occurrence of wear. Furthermore, a self-locking design of the worm gear has the effect of the sleeve (4) being retained in its set position when the drive (7) is switched off.

Abstract: The invention relates to a crankshaft (1) for a reciprocating internal combustion engine, in which the connecting rods are mounted, with an eccentric sleeve (4) connected in between, on the crankshaft journal (3) of a crankshaft (1). A rotation of the eccentric sleeve (4) with respect to the crankshaft journal (3) therefore leads to a change in the effective length of the connecting rod. The rotation of the sleeve (4) is brought about via an electric or hydraulic motor (7) which drives a worm (6) which engages in an outer toothing (5) of the sleeve (4). By means of the active drive, rotation of the sleeve (4) is ensured even if the auto-rotation is impaired due to the occurrence of wear. Furthermore, a self-locking design of the worm gear has the effect of the sleeve (4) being retained in its set position when the drive (7) is switched off.

Abstract: The invention relates to a crankshaft for a reciprocating internal combustion engine, with the crankshaft having a crankpin (11) with an eccentric sleeve (10), through the rotation of which relative to the crankpin the effective stroke of a crankshaft can be modified. Sleeve (10) can be locked in two positions separated by 180° by means of two locking elements (7, 14). The locking elements are arranged in the crankshaft and are supplied with a hydraulic fluid via feed lines (2, 4), which likewise extend in the crankshaft. A feed line (3) for a fluid can furthermore be provided, this being passed to the inner surface of the sleeve (10) in such a way that a torque about the crankpin (11) can be exerted on said sleeve.

Abstract: The invention relates to a crankshaft for a reciprocating internal combustion engine, with the crankshaft having a crankpin (11) with an eccentric sleeve (10), through the rotation of which relative to the crankpin the effective stroke of a crankshaft can be modified. Sleeve (10) can be locked in two positions separated by 180° by means of two locking elements (7, 14). The locking elements are arranged in the crankshaft and are supplied with a hydraulic fluid via feed lines (2, 4), which likewise extend in the crankshaft. A feed line (3) for a fluid can furthermore be provided, this being passed to the inner surface of the sleeve (10) in such a way that a torque about the crankpin (11) can be exerted on said sleeve.

Abstract: An internal combustion engine comprising four valves for each cylinder consisting of a first pair of continuously operable intake and exhaust valves and a second pair of additional, optionally disconnectible intake and exhaust valves, the valve lift curve of the first pair being intended for torque in the partial load range and the second pair for power in the full load range, the engine including two overhead camshafts for actuating the four valves per cylinder, with the valves arranged so that in each case the disconnectible valves of two adjacent cylinders are adjacent to one another and may be actuated by cams on a sleeveshaft which is freely rotatable on the camshaft but may be coupled rotationally rigidly at the correct angle to the camshaft by way of an axially slidable shift collar.