Device for Varying a Compression Ratio, Reciprocating-Piston Internal Combustion Engine and Working Device

An apparatus configured to change a compression ratio of a reciprocating piston internal combustion engine, the apparatus comprising:

• an externally toothed eccentric which is configured to be arranged in a rotationally movable manner between a pin journal of a crankshaft of a crank drive and a connecting rod eye of a connecting rod in order to change a stroke height of a piston of the reciprocating piston internal combustion engine, which piston is coupled mechanically to the connecting rod;
• an adjusting unit which is coupled mechanically to an external toothing system of the eccentric and is configured to set the eccentric by way of rotation of the eccentric, and
• a coupling unit which is configured to couple the eccentric mechanically to the adjusting unit and to first and second takeoff shafts which are arranged parallel to one another, are spaced apart radially from one another, and are coupled mechanically to one another, wherein
• the first takeoff shaft is coupled mechanically to the external toothing system of the eccentric,
• the second takeoff shaft is coupled mechanically to the adjusting unit, and
• the first and second takeoff shafts of the coupling unit, the eccentric and/or the adjusting unit are configured for the partial or complete arrangement in the interior of a crankcase of the crankshaft, within an installation space of a web of the crankshaft and/or within an installation space of a counterweight.

An apparatus configured to change a compression ratio of a reciprocating piston internal combustion engine, the apparatus comprising:

• an externally toothed eccentric which is configured to be arranged in a rotationally movable manner between a pin journal of a crankshaft of a crank drive and a connecting rod eye of a connecting rod in order to change a stroke height of a piston of the reciprocating piston internal combustion engine, which piston is coupled mechanically to the connecting rod,
• an adjusting unit which is coupled mechanically to an external toothing system of the eccentric and is configured to set the eccentric via rotation of the eccentric, and
• a coupling unit configured to couple the eccentric mechanically to the adjusting unit, wherein
• the adjusting unit has an adjusting gear which is configured as an internal gear with an external toothing system configured to receive an adjusting movement for the eccentric, and is configured with an internal toothing system fixedly with respect to the external toothing system for conjoint rotation for mechanical coupling to the coupling unit, and
• (i) the coupling unit, the eccentric and/or the adjusting unit are configured for the partial or complete arrangement:
• (a) in the interior of a crankcase of the crankshaft, (b) within an installation space of a web of the crankshaft, and/or (c) within an installation space of a counterweight, and/or (ii) the coupling unit is arranged partially or completely in the interior of an installation space of the adjusting gear.