The invention relates to a power unit, in particular for a hybrid vehicle, comprising a reciprocating piston engine and comprising a generator which can be in driving engagement therewith, wherein the reciprocating piston engine has at least two pistons, which are guided in at least two cylinders in tandem arrangement, and two counter-rotating crankshafts, which are connected to the pistons by connecting rods and which are mechanically coupled so as to be in phase, wherein a first generator can be driven by the first crankshaft and a second generator can be driven by the second crankshaft.

[Task] A task is to make a V-type engine compact while suppressing the decrease in the output thereof.

[Solution] A V-type engine 1 includes an engine body (3) including a crankcase (7) configured to rotatably support a crankshaft (11), and a pair of cylinder banks (8, 9) extending from the crankcase (7), a pair of exhaust pipes (31, 32) connected to the pair of cylinder banks (8, 9), a catalyst pipe (34) connected to the pair of exhaust pipes (31, 32), and a catalyst (33) accommodated in the catalyst pipe (34), wherein each of the pair of exhaust pipes (31, 32) is connected to the catalyst pipe (34) on an upstream side of the catalyst (33) in an exhaust direction, and the catalyst pipe (34) is arranged adjacently to the pair of cylinder banks (8, 9).

The invention relates to a power unit, in particular for a hybrid vehicle, having a two-cylinder reciprocating piston engine which comprises two pistons guided in two cylinders in a tandem arrangement and two counter-rotating crankshafts connected to the pistons by connecting rods, and having an alternator that can rotate in the opposite direction to the first crankshaft and in the same direction as the second crankshaft. The invention is characterized in that the alternator is in driving engagement with at least the first crankshaft via a traction mechanism and comprises a counterbalance, wherein the first crankshaft is connected via a timing chain or a timing belt to a balancing shaft which carries a further balancing mass. The invention also relates to a vehicle, in particular a hybrid vehicle, having such a power unit.

The invention relates to a generator set, in particular a generator set of a hybrid vehicle, with a two-cylinder piston engine (1), which has a crankshaft housing (10), in which two counter-rotating crankshafts (11, 12) are arranged, which are connected by means of piston rods (13) to pistons (18, 19), which are guided inside two cylinders (21, 22) in a tandem arrangement, wherein at least one crankshaft (11, 12) is drivingly connected to a generator (41, 42), and wherein the piston engine (1) comprises a cylinder head (20), which is connected to the crankshaft housing (10), wherein the piston engine (1) has a lower-mounted camshaft (30), and the cylinder head (20) can be connected to the crankshaft housing (10) in at least two positions, in particular positions rotated through 180 relative to each other. Furthermore, the invention relates to a vehicle with such a generator set.

An internal combustion engine; wherein at least two cylinders continuously communicate via the cylinder head; and wherein the connecting rod in one cylinder is offset from the connecting rod in the second cylinder by a first angle between 8 and 12 degrees as measured from the crankshaft, and a camshaft having a second offset of one-half of the first angle offset.

The invention relates to a power unit, in particular for a hybrid vehicle, comprising a reciprocating piston engine and comprising a generator which can be in driving engagement therewith, wherein the reciprocating piston engine has at least two pistons, which are guided in at least two cylinders in tandem arrangement, and two counter-rotating crankshafts, which are connected to the pistons by connecting rods and which are mechanically coupled so as to be in phase, wherein a first generator can be driven by the first crankshaft and a second generator can be driven by the second crankshaft.

A crankshaft lubricating oil passage structure of a V-shaped engine includes a main oil passage and a sub oil passage. The V-shaped engine includes a pair of banks. The pair of banks includes cylinders and is disposed in a V shape with respect to the crankshaft. The V bank angle as an included angle of the cylinders of the respective banks is set at a narrow angle. The main oil passage is provided between the pair of banks in the cylinder block or the crankcase. The sub oil passage extends from the main oil passage to the bearing portion of the crankshaft and guides lubricating oil to the bearing portion. The main oil passage is formed by connecting divided passage portions that are divided partway in an axial direction by an oil passage connection member that is a separate member from the cylinder block or the crankcase.

A V-type engine includes an engine body including a crankcase configured to rotatably support a crankshaft, and a first and second cylinder banks extending from the crankcase, a first exhaust pipe connected to the first cylinder bank; a second exhaust pipe connected to the second cylinder bank; a merging pipe connected to the first and second exhaust pipes; a first catalyst accommodated in the first exhaust pipe; a second catalyst accommodated in the second exhaust pipe; and a muffler detachably connected to the merging pipe, wherein the first catalyst is arranged along an outer surface of the first cylinder bank, and the second catalyst is arranged along an outer surface of the second cylinder bank.

An internal combustion engine; wherein at least two cylinders continuously communicate via the cylinder head; and wherein the connecting rod in one cylinder is offset from the connecting rod in the second cylinder by a first angle between 8 and 12 degrees as measured from the crankshaft, and a camshaft having a second offset of one-half of the first angle offset.

A reciprocating internal combustion engine having a line of cylinders arranged in parallel which are joined via connecting rods and pistons by means of a crank drive that is jointly mounted in a crankshaft bearing, whereby the crankshaft bearing of the crank drive can have been offset relative to the cylinder axis.