Device for changing compression of a reciprocating piston internal combustion engine

A device for changing compression of an internal combustion engine, wherein the internal combustion engine has a cylinder, a piston reciprocating in the cylinder, a crankshaft having a crank, and a connecting rod having a first end connected to the crank and a second end connected to the piston, said device comprising:

• an eccentric bushing resting with an inner cylindrical surface on the crank and with an eccentric outer cylindrical surface at the connecting rod so that by rotating the eccentric bushing relative to the connecting rod an effective length of the connecting rod is changed;
• said eccentric bushing having at least two locking recesses;
• a locking member connected to the connecting rod, said locking member movable in a first direction into a first one of said at least two locking recesses for locking said eccentric bushing in a first rotational position and moveable in a second direction into a second one of said at least two locking recesses for locking said eccentric bushing in a second rotational position, wherein in said first rotational position said effective length of the connecting rod is at a maximum and in said second rotational position said effective length of the connecting rod is at a minimum.