A main bearing cap construction far a dual-crankshaft, opposed-piston engine has two sets of bolts in a cross-bolted configuration. In a dual-crankshaft opposed-piston engine with at least four main bearings, at least one of the main bearings will have a cap with two sets of bolts in a cross-bolted configuration. In addition to having a cross-bolted configuration, the main bearing cap configuration can have flanges to receive blind bolts and/or additional surface area to interface with the cylinder block.

The present invention provides an internal combustion engine that comprises at least one axial geometric cylinder axis and one axial geometric central axis, both geometric axes being orthogonal to one another; a first cylinder coaxial to the cylinder axis; a second cylinder coaxial to the cylinder axis provided opposite the first cylinder; a central body comprising a hole that is axially aligned with the central shaft, a first cylindrical recess and a second cylindrical recess configured to couple the second cylinder; a central drive shaft arranged in the hole of the central body; a first piston provided in the first cylinder, said first piston being connected to the central drive shaft by means of a first pair of connecting rods; and a second piston provided in the second cylinder opposite the first piston, said second piston being connected to the central drive shaft by means of a second pair of connecting rods.

This invention relates to the field of opposed-piston engines having two pistons in one cylinder configured to have facing heads. Specifically, this is an engine with two crankshafts, two piston heads facing each other in a single cylinder, with the following features: compact size relative to a comparable design, improved or equivalent performance to a comparable design as a result of any of the following: locating crankshafts in a different plane from the cylinder axes; the use of shared duct structures; and the use of an embedded compressor chamber for efficient operation to cover all volumetric requirements, fulfilling the entire thermodynamic cycle, and performing in addition the sweeping and overloading of air or an air/fuel mixture in the cylinder combustion chamber in each revolution of two or more crankshafts, either with or without advancement between the crankshafts.

A crank and connecting rod mechanism, comprising at least one piston, which reciprocates within at least one cylinder, comprising: at least one connecting rod, comprising: a piston end pivotally connected to the at least one piston, a crank end; at least one gear set, comprising: a crankpin, the crank end pivotally connected to the crankpin; a crank gear; a crank gear shaft, the crank gear rotatably mounted on the crank gear shaft, the crankpin located between centerline of the crank gear shaft and radius of the pitch circle of the crank gear; a stationary gear, the crank gear meshing with the stationary gear, the crank end driving the crankpin, which drives the crank gear and the crank gear shaft about the stationary gear; the crank pin and the crank end rotating about the stationary gear and following the path of a roulette of a centered trochoid about the stationary gear.

A ferritic aero diesel engine. The ferritic aero diesel engine includes an iron crankcase, a steel crankshaft and eight steel piston assemblies. The iron crankcase has a flat, horizontally opposed eight cylinder arrangement with a first set of cylinder walls defining a first set of cylinders in a first bank and a second set of cylinder walls defining a second set of cylinders in an opposed second bank. The steel crankshaft is rotatably mounted at least partially within the iron crankcase. Each of the steel piston assemblies of the plurality of steel piston assemblies is received within a respective cylinder of the iron crankcase and is coupled to the steel crankshaft. The first and second sets of cylinder walls have a minimum wall thickness of between approximately 4.8 and 5.2 mm.

An opposed piston engine has a driveshaft with at least one combustion cylinder positioned between opposing, curvilinear shaped cams mounted on the driveshaft, where the center axis of the combustion cylinder is parallel with but spaced apart from the driveshaft axis. A piston assembly is disposed in each end of the cylinder, with one piston assembly engaging one cam and the other piston assembly engaging the other cam. Each piston assembly includes a cam follower that can move along a curvilinear shaped cam to reciprocate the piston assembly within the cylinder. The combustion cylinder includes an intake port in fluid communication with an annular intake channel formed in the engine block in which the cylinder is mounted, and an exhaust port in fluid communication with an annular exhaust channel formed in the engine block.

A high-performance internal combustion engine includes: a crankshaft chamber; at least two cylinder chambers; a crankshaft linkage mechanism, disposed in the crankshaft chamber; at least two pistons, connected to the crankshaft linkage mechanism and accommodated in the cylinder chambers; an inlet pipe, only communicated with the crankshaft chamber; at least two flow guiding pipes, having one end thereof only communicated with the crankshaft chamber and another end thereof only communicated with the cylinder chamber; and a check valve unit, including a check valve disposed at a connecting location of the inlet pipe and the crankshaft chamber, and two first switch valves disposed at connecting locations of the flow guiding pipes and the cylinder chambers. Accordingly, the working efficiency of the high-performance internal combustion engine can be increased.

An opposed piston engine has a driveshaft with a first combustion cylinder parallel with a driveshaft and disposed about the driveshaft at a first radius and a second combustion cylinder parallel with the driveshaft and disposed about the driveshaft at a second radius greater than the first radius. A first pair of curvilinear shaped cams are associated with the first combustion cylinder and disposed on the driveshaft and a second pair of curvilinear shaped cams are associated with the second combustion cylinder and disposed on the driveshaft outwardly of the first pair of cams.

A crank and connecting rod mechanism having an angularly disposed connecting rod and mirror image gear sets, each comprising: a crank gear rotatably mounted on a crank gear shaft, having a crankpin pivotally connected to and driven by the connecting rod, the crankpin following the path of a roulette of a centered trochoid about a first stationary gear as the crank gear is driven about the first stationary gear and a crankshaft driven gear is driven about a second stationary gear, a counterbalanced radial arm affixed to a drive shaft at a pivot point of the counterbalanced radial arm, the counterbalanced radial arm driving the drive shaft at the pivot point and the crank gear shaft at an outer radial arm bearing, the drive shaft driving a drive shaft gear, which drives an output gear that drives an output shaft.

A crank and connecting rod mechanism having an angularly disposed connecting rod and mirror image gear sets, each comprising: a crank gear rotatably mounted on a crank gear shaft, having a crankpin pivotally connected to and driven by the connecting rod, the crankpin following the path of a roulette of a centered trochoid about a first stationary gear as the crank gear is driven about the first stationary gear and a crankshaft driven gear is driven about a second stationary gear, a counterbalanced radial arm affixed to a drive shaft at a pivot point of the counterbalanced radial arm, the counterbalanced radial arm driving the drive shaft at the pivot point and the crank gear shaft at an outer radial arm bearing, the drive shaft driving a drive shaft gear, which drives an output gear that drives an output shaft.