Patent ID: 6250264
Filing Date: 2001-06-26
Classification: F01B,F02B

Abstract:
Arrangement in a combustion engine (10) having internal combustion, comprising a number of engine cylinders (21), arranged annularly around a common drive shaft (11) and having cylinder axes running parallel to the drive shaft, each cylinder including a pair of pistons (44, 45) movable towards and away from each other and a common, intermediate working chamber (K) for each pair of pistons, while each piston (44, 45) is equipped with its respective axially movable piston rod (48, 49), the free outer end of which is supported via a support roller (53) against its respective ""sine""-like curve shaped, cam guide device (12a, 12b). arranged at opposite ends of the cylinder (21) and which controlling movements of the piston relative to the associated cylinder, characterised inthat at least one (12b) of the cam guide devices (12a, 12b) is axially displaceable in relation to a one-piece drive shaft (11) and is provided with a hydraulic mechanism, for separately adjusting in axial direction the position of said at least one cam guide device (12b) including regulation of the relative spacing between the pistons (44, 45), especially for regulation of the compression ratio in a common working chamber (K) between the pistons,said hydraulic mechanism includes an annular pressure oil chamber (13b) and a simulator piston (12b'),said simulator piston (12b') partitions said annular pressure oil-chamber (13b) into two sub-chambers, andeach sub-chamber is connected to a respective one of two pressure oil circuits.