Generator set

A hybrid vehicle generator apparatus comprising:

• a two-cylinder piston engine having a crankshaft housing;
• two counter-rotating crankshafts configured and arranged in the crankshaft housing, the crankshafts connected by piston rods to pistons guided inside the two cylinders of the piston engine in a tandem arrangement, wherein at least one crankshaft is drivingly connected to a generator, and wherein the piston engine has a cylinder head connected to the crankshaft housing, wherein each crankshaft carries a flywheel having a balance mass, wherein at least one flywheel has external tooth forms spaced at equal intervals, wherein at one point on the at least one flywheel, gap between tooth forms as longer than the equal intervals to act as a circumferential marking in order to detect a crankshaft position using a crankshaft sensor;
• and
• a lower-mounted camshaft such that the cylinder head is connectable to the crankshaft housing in one of at least two positions having 180° relative rotation to each other, wherein the camshaft is configured and arranged in a central plane between the crankshafts.

A hybrid motor vehicle comprising:

• a two-cylinder piston engine having a crankshaft housing;
• two counter-rotating crankshafts configured and arranged in the crankshaft housing, the crankshafts connected by piston rods to pistons guided inside the two cylinders of the piston engine in a tandem arrangement, wherein at least one crankshaft is drivingly connected to a generator, and wherein the piston engine has a cylinder head connected to the crankshaft housing, wherein each crankshaft carries a flywheel having a balance mass, wherein at least one flywheel has external tooth forms spaced at equal intervals, wherein at one point on the at least one flywheel, gap between tooth forms is longer than the equal intervals to act as a circumferential marking in order to detect a crankshaft position using a crankshaft sensor;
• and
• a lower-mounted camshaft such that the cylinder head is connectable to the crankshaft housing in one of at least two positions having 180° relative rotation to each other.