Internal combustion engine with variable compression ratio

Engine according to one of the preceding claims, wherein the eccentrics (10) comprise bushes journalled in a wall of the engine block (1) and including a crankshaft bearing (9) which is positioned eccentrically with respect to the bush centerline.

Engine according to one of the preceding claims, wherein the engine block (1) comprises at least two cylinders (3) positioned in-line.

Engine according to one of the preceding claims, wherein the eccentrics (10) are adjustable by means of an electronically controlled adjustment member (22).

Engine according to one of the preceding claims, wherein the means (21) to prevent rotation of the gearbox (2) includes a reaction rod engaging the gearbox outside the center and preferably extending in a direction substantially perpendicularly to the cylinder (3) of the engine block (1).

Engine according to one of the preceding claims, wherein the engine block (1) comprises at least two cylinders (3) positioned in V-shape having a center plane, the eccentrics (10) being rotatably supported by second eccentrics (24) having the same eccentricity but being adjusted in opposite direction, such that the eccentricities are a mirror image with respect to the center plane.

Internal combustion engine, comprising a engine block (1) with at least two cylinders (3), a crankshaft (5) having at least one crank (6) and being rotatably supported within the engine block, at least two pistons (4) reciprocable within their respective cylinder and having a piston rod (6) mounted to the piston on one end and mounted to the at least one crank of the crankshaft on the other end, said crankshaft (5) being journalled on bearings (9) which are mounted in adjustable eccentrics (10), rotation of the eccentrics causing relative repositioning of the crankshaft centerline (8) and the engine block (1) in order to adjust the compression ratio of the pistons in their cylinder, the engine further comprising a gearbox (2) having an input shaft (15) connected to the crankshaft (5), the gearbox (2) and the engine block (1) being gearbox are relatively repositioned simultaneously with a crankshaft repositioning, characterized in that the cylinders (3) of the engine are positioned in a V-shape having a center plane, wherein adjustable eccentrics (10) are supported by second eccentrics (24) having the same eccentricity as the first eccentrics (10) and being adjusted simultaneously with the first eccentrics, but in opposite direction, such that the eccentricities form a mirror image with respect to the center plane of the V-shape.

Gearbox flange unit for use in an internal combustion engine, comprising a gearbox flange (117) adapted to be fixed to an eccentric assembly (11) of a crankshaft, an engine block part (133) attachable to an engine block (1) and a gearbox part (134) attachable to a gearbox housing (2), said engine block part and gearbox part being rotatably connected to the gearbox flange (117) through bearings, and further comprising a member (121) to prevent rotation of the gearbox (2) relative to the engine block (1), said member being mounted between the engine block part and the gearbox part.