The invention relates to a power unit, in particular for a hybrid vehicle, comprising a reciprocating-piston engine and at least one generator (40) which is drivingly connected to said engine, wherein the reciprocating-piston engine has at least two pistons (44), which are guided in at least two cylinders (29) in a tandem arrangement, and two crankshafts (22), which are connected to the pistons (44) by means of connection rods (31), run in opposite directions, and are mechanically coupled in the same phase. The hub-hub connection has a second connection means in the form of a connection disc (10) with support surfaces (12), on each of which the first hub and the second hub rest. The second connection means additionally has a matrix with hard material elements embedded therein, in particular diamond chips, which are arranged in the support surfaces (12). The invention additionally relates to a vehicle, in particular a hybrid vehicle, comprising a power unit.
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