A rotary engine having a crankshaft, a housing provided with lobe accommodating portions arranged to surround the crankshaft, and combustion chambers communicating with the lobe accommodating portions, a rotor rotatable eccentrically with respect to the crankshaft and provided with lobes continuously accommodated in the lobe accommodating portions, a housing cover provided with a bearing portion through which the crankshaft is inserted so as to be rotatably supported, and a lubricating unit to supply oil to the bearing portion, wherein the lubricating unit includes an oil pan to accommodate oil therein, an oil pump to pump up oil filled in the oil pan, and an oil supply passage having both ends located in the oil pump and the bearing portion, respectively, is provided. This structure may allow direct and effective lubrication of the bearing portion, and can employ a journal bearing.

A rotary engine having a crankshaft, a housing provided with lobe accommodating portions arranged to surround the crankshaft, and combustion chambers communicating with the lobe accommodating portions, a rotor rotatable eccentrically with respect to the crankshaft and provided with lobes continuously accommodated in the lobe accommodating portions, a housing cover provided with a bearing portion through which the crankshaft is inserted so as to be rotatably supported, and a lubricating unit to supply oil to the bearing portion, wherein the lubricating unit includes an oil pan to accommodate oil therein, an oil pump to pump up oil filled in the oil pan, and an oil supply passage having both ends located in the oil pump and the bearing portion, respectively, is provided. This structure may allow direct and effective lubrication of the bearing portion, and can employ a journal bearing.

An assembly for an aircraft having a propeller, including an engine assembly having an engine shaft configured for driving engagement with the propeller. The engine assembly includes first and second heat exchangers configured for circulation of at least one of a liquid coolant and a lubricant therethrough. A wheel well is configured for receiving a retracted landing gear. A first cooling duct receives the first heat exchanger and has a first outlet downstream of the first heat exchanger, and a second cooling duct receives the second heat exchanger and has a second outlet downstream of the second heat exchanger. The outlets are in direct fluid communication with an environment of the aircraft, and laterally spaced from each other. The wheel well is located between the outlets. A method of cooling an engine assembly is also discussed.

A rotary piston and cylinder device (1) comprising a rotor (2), a stator and a shutter disc (3), the rotor comprising a piston (5) which extends from the rotor into the cylinder space, the rotor and the stator together defining the cylinder space, the shutter disc passing through the cylinder space and forming a partition therein, and the disc comprising a slot (3a) which allows passage of the piston therethrough, and a surface of the rotor and a surface of the stator opposing each other forming a close-running surface pair, and at least one of the surfaces comprising an abradable coating (10) which is provided with a plurality of recess formations, and the recess formations are discontinuous from each other.

A rotary internal combustion engine with a housing having a fluid passage defined therethrough opening into a portion of its inner surface engaging each peripheral or apex seal of the rotor. An injector has an inlet for fluid communication with a pressurized lubricant source and a selectively openable and closable outlet in fluid communication with the fluid passage for delivering the pressurized lubricant to each seal through the fluid passage. A housing for a Wankel engine and a method of lubricating peripheral seals of a rotor in an internal combustion engine are also discussed.

A rotary internal combustion engine with a housing having a fluid passage defined therethrough opening into a portion of its inner surface engaging each peripheral or apex seal of the rotor. An injector has an inlet for fluid communication with a pressurized lubricant source and a selectively openable and closable outlet in fluid communication with the fluid passage for delivering the pressurized lubricant to each seal through the fluid passage. A housing for a Wankel engine and a method of lubricating peripheral seals of a rotor in an internal combustion engine are also discussed.

The invention relates to the engines area, in particular to an internal combustion engine (ICE) which can be used on water, air and land transport vehicles. The six-stroke rotary-vane internal combustion engine comprising a stator with inlet and outlet ports, holes for spark plugs and the working chambers of air-fuel intake and compression, alternating with working chambers of expansion and removing of the combustion products; a cylindrical rotor rigidly fixed to a shaft and having longitudinal grooves in which vanes are placed, with combustion chambers made on the cylindrical surface of the rotor between the grooves; side walls; front and rear bearing shields the side walls of all working chambers of the engine and composite prismatic parts are placed in grooves made in the end surfaces of the rotor, the prismatic parts at their end surfaces are pressed by springs to the adjacent vanes and by their side edges are pressed against the side walls of the working chambers. The achieved effect consists in providing an engine with completely sealing of the working zone preventing as leaks of air-fluid mixture beyond the working zone as well as inter-chamber leaks.

There is provided a combustion engine and an electric generator. The combustion engine comprises an engine housing, a cylindrical member configured to rotate about an axis within a cavity of the engine housing, a piston, and an engagement section for engaging the piston. The piston is mounted to the engine housing and the engagement section is mounted to the cylindrical member, or the piston is mounted to the cylindrical member and the engagement section is mounted to the engine housing, such that the piston and the engagement section periodically rotate past one another as the cylindrical member is rotated within the engine housing. The piston engages the engagement section as they rotate past one another, the engagement forcing the piston to compress gases in a combustion chamber, which fire to drive the rotation of the cylindrical member. The electric generator may be driven by the combustion engine.

A rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by a first eccentricity and the rotor has a peripheral outer surface having a peritrochoid inner envelope configuration defined by a second eccentricity larger than the first eccentricity. Also, a rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by an eccentricity, and a rotor with a peripheral outer surface between adjacent ones of the apex portions being inwardly offset from a peritrochoid inner envelope configuration defined by the eccentricity. The engine may have an expansion ratio with a value of at most 8. The rotary engine may be part of a compound engine system.

This invention describes a mechanism containing two coaxial rotators, embedded on a driveshaft, (1a, 1b) that spin alternately with two velocities. Each rotator has at least two vanes (2) and during the rotators' spin chambers of variable capacities form between the vanes. When the vanes touch together the velocities of the rotators change (2). Rotation speed changes from V1 to V2 and vice-versa are enabled by gearshifts consisting of two-speed ratchets (3) interlocked with rotators' shafts (1a, 1b) that transmit force from and to steering ratchets (4). At a constant velocity of the steering ratchet (4) after its every 180 rotation the angular velocity of the two-speed ratchet (3) and rotator change. The correct functioning of the whole mechanism is provided by engagement of the steering ratchet, transporting force from and to the two-speed ratchet (3), with the coaxial steering ratchet (4) transporting force from the rotator (1b).