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.

A compact and efficient Z-twin internal combustion engine is described herein. The Z-twin internal combustion engine comprises horizontally opposed cylinder arrangement that allows for vibration cancellation. The Z-twin engine comprises a central shared cam that drives angled side valves of both the opposing cylinders, thereby greatly reducing moving parts and thus provides a significantly more efficient angled valve approach.

According to one embodiment, a drive device includes a first piston reciprocatively along a first direction within a first mount plane, a first crankshaft orthogonal to the first mount plane, a first XY separation crank mechanism between the first piston and the first crankshaft, which converts reciprocating motion of the first piston and rotary motion of the first crankshaft into each other, a second piston reciprocatively along a second direction symmetrical to the first direction within a second mount plane symmetrical to the first mount plane about a central reference plane, a second crankshaft orthogonal to the second mount plane, a second XY separation crank mechanism between the second piston and the second crankshaft, which converts reciprocating motion of the second piston and rotary motion of the second crankshaft into each other, and a coupler-synchronizing mechanism which rotates the first and second crankshafts in synchronous with each other.

Disclosed is a reciprocating piston engine, comprising a combined structure with an optimized double-crankshaft and variable compression ratio pistons, characterized in that the variable compression ratio piston is a piston serving as a double-acting hydraulic cylinder, a control valve bush of a slide-valve type directional control valve is fixed in a central mounting hole of the inner piston, and a control valve core is mounted in a rotatory sliding or nut-ball screw manner in a central mounting hole in the inner surface of the piston top; and the double-crankshaft engine is formed by two reverse rotating crankshafts which are coupled by gears to be in synchronous reverse rotation motion together, each piston being connected to a connecting rod shaft of two crankshafts, and a piston control valve driving mechanism being mounted between the two crankshafts.

A two-cylinder reciprocating engine includes a cylinder block; a first cylinder with a combustion chamber; a second cylinder with a combustion chamber; a crankshaft coupled to the first cylinder and the second cylinder with a crank angle of 270 degrees; a first exhaust port connected with the combustion chamber of the first cylinder; a second exhaust port connected with the combustion chamber of the second cylinder; a first header connected with the first exhaust port; a second header connected with the second exhaust port; and an exhaust converging section connected with the first header and the second header, wherein the first header, the second header, and the exhaust converging section are in the cylinder block.

An outboard turbocharged internal combustion engine includes an outboard engine housing. An exhaust gas turbocharger has a turbine and a charger disposed on the outboard engine housing. A charge air cooler is integrated in an intake unit. The intake unit is routed via connecting ducts and includes a unit container having first, second, and third container sections. The first container section is connected to the second container section accommodating the charge air cooler. The second container section is connected to the third container section that carries air to the charge air cooler. The third container section is formed of a tubular body tapering downward from the second container section toward the charger of the exhaust gas turbocharger. The first container section, the second container section, and the third container section are combined as an integral unit forming an intake unit module composed of a light alloy.

An internal combustion engine has at least one piston which performs stroke movements in a cylinder crankcase. Via two connecting rods, the piston interacts with two parallel crankshafts which rotate synchronously in opposite directions. The connecting rods have, on a side facing toward a piston crown of the piston, bearing eyelets which, via piston pins, are operatively connected to the first and second bearings provided at opposite first and second sides of the piston, which bearings and piston pins act as a device for compensating an asymmetry of the profile of the crankshafts. To optimize the internal combustion engine, the first and the second bearings have cylindrical bearing disks which, firstly, are rotatably mounted in piston bores and which, secondly, include disk bores for receiving first and second pin sections of the piston pins.

A pivoting bearing is provided for two connecting rods in a reciprocating piston of an internal combustion engine having two crankshafts which are driven via the reciprocating piston and the connecting rods. The pivoting bearing is received by piston bores of the piston and has gudgeon pin bores for mounting gudgeon pins for gudgeon pin eyes of the connecting rods. The pivoting bearing has radial bearing regions which are provided with the pin bores, are arranged on both sides of a center longitudinal axis of the reciprocating pistons, and delimit the gudgeon pin eyes in a manner which forms an intermediate space. To optimize the pivoting bearing, the bearing regions of the pivoting bearing are configured as cylinder bodies with a cup-like cross section, of which each cylinder body has a base wall and a bearing ring shell. The base walls of the two cylinder bodies extend at a spacing from one another, and the bearing ring shells which surround the base walls are guided away from the base walls in opposite directions. A plurality of connecting stubs run between the base walls in such a way that two connecting stubs are arranged on a side of the pivoting bearing, which side faces a piston crown, and extend at a relatively small spacing from ring sections of the gudgeon pin eyes, and in such a way that the connecting stubs and the ring sections have lubricating structures for lubricating connecting rod bearings of the connecting rods.

A moment-cancelling, four-stroke engine is disclosed. The engine includes a first cylinder having a first piston and a second cylinder having a second piston, a first crankshaft operably connected to the first piston and a second crankshaft operably connected to the second piston. The first crankshaft rotates in a first direction and the second crankshaft rotates in a second direction that is opposite the first direction to cancel the moments applied to the engine and reduce engine vibration.

An opposed-piston engine includes a backlash reducing gear with at least a first and second gear that move relative to each other because of a hydraulic pressure applied within the gear. A backlash control system that includes the backlash reducing gear can dynamically adjust backlash between at least two gears in the gear train of the engine during operation of the engine instead of setting backlash prior to operation of the engine. A method for adjusting backlash in a two-stroke-cycle, opposed-piston engine with a backlash reducing gear includes providing hydraulic fluid, such as oil, to the gear, and allowing the backlash reducing gear to adapt to changes in the engine that include temperature changes, torque reversals, changes in load and the like. The backlash reducing gear adapts to changes in the engine by controlled leaking and intake of oil.