Abstract: One embodiment of the invention relates to an internal combustion engine including an engine block having a first cylinder and a second cylinder, a crankshaft configured to rotate about a crankshaft axis, a flywheel coupled to the crankshaft, a throttle body, an air filter assembly, a first electric fan coupled to a first duct, and a second electric fan coupled to a second duct. The first duct is configured to direct cooling air directly over the first cylinder. The second duct is configured to direct cooling air directly over the second cylinder. The first cylinder is at least partially within the first duct. The second cylinder is at least partially within the second duct.

Abstract: The present invention uses the exhaust gas of an internal combustion reciprocating engine to drive a turbine. The turbine is position around the cylinder. The turbine is connected to systems that will use the energy to improve the total system efficiency. One such system would be connected to a compressor to create the force induction required for two-stroke engines.

Abstract: An exhaust fan chamber is defined with a belt cover and a fan cover provided over the belt cover, and an exhaust fan is accommodated in the exhaust fan chamber. The fan cover has an air intake port for sucking air within an engine cover into the exhaust fan chamber and an exhaust outlet port for discharging air within the exhaust fan chamber to outside of the exhaust fan chamber. The exhaust outlet port is in communication with an exhaust opening formed in an upper portion of the engine cover so that the air discharged through the exhaust outlet port is discharged to outside of the engine cover through the exhaust opening.

Abstract: A device is provided for a piece of equipment with an internal combustion engine having a crank case and a combustion space, wherein an air cooling stream is present for cooling the internal combustion engine. The device, on the one hand, is effective for cleaning of the intake air, and on the other hand, a thermal separation between tank and crank case is achieved in a simple manner. The device includes at least one recess, which is constructed open or closed, and is arranged in the crank case, and is separated from an interior of the crank case and forms air cushions.

Abstract: A portable, hand-held, combustion engine powered working machine, e.g. a power cutter, chain saw or trimmer, comprising: a tool unit including a working tool; a machine unit (104) including an internal combustion engine (204) with a crankshaft (304); an assembly for supplying cleaned air and fuel to the engine, having an upstream air inlet; a fan housing (404) located in an outer end of said tool unit and having an air inlet for ambient air; a fan wheel (302) arranged in the fan housing (404); the fan wheel (302) driven by the crankshaft (304) to supply cooling air, sucked in through the air inlet to cool the engine (204); a combustion air duct (406) having a combustion air intake opening (408) located radially outside of the fan wheel (302) leads the combustion air to the assembly for supplying cleaned air and fuel to the engine via a possible air filter (402).

Abstract: A motorcycle including a frame and an engine and transmission assembly coupled to the frame. The engine and transmission assembly includes at least one cylinder head assembly having a cooling port and defining a cooling passageway in fluid communication with the cooling port and passing through at least a portion of the cylinder head assembly. The motorcycle also includes a conduit coupled to the cooling port and a fan in fluid communication with the conduit and operable at an operating speed to draw air from the cooling passageway, and move air through the cooling port and through the conduit.

Abstract: Method and arrangement for providing an energy converter that includes a combustion system (1) including at least one piston (2, 3), at least one combustion chamber (6, 7) having at least one inlet (11, 13) and at least one outlet (10, 12) with inlet and outlet valves (14, 15, 16, 17). At least one controllable inlet valve and at least one outlet valve is also provided. A fuel supply is provided (18, 19) for supplying fuel and a medium containing oxygen is provided for induction into the combustion chamber (6, 7). An electric machine (9) is arranged to interact directly or indirectly with the piston (2, 3) in an electromagnetic manner such that it produces electrical energy from the piston movements, as well as uses electrical energy to affect the piston movement. A control unit (30) controls the combustion system (1) and the electric machine (9). The energy converter is arranged to adapt its power output depending on the required load of the energy converter.

Abstract: A support system for a cooling fan for a heat exchanger. A suspension system supports an inner hub inside an outer support structure. The inner hub or ring supports the fan and motor. The suspension system includes an array of spiral support arms, extending from the inner hub to the outer supports. These arms have both spanwise and chordwise camber. The particular suspension system increases natural frequencies of the support system, over that wherein purely radial arms connect the inner hub and outer supports.

Abstract: A small and lightweight sound-proof generator exhibiting sufficient cooling effect. An inverter (19), an engine fan (32), a power generating body (33), an engine (34), a recoil fan (61), a recoil starter (63) are coaxially arranged sequentially from a first inlet port side. A first cooling air passage for cooling inverter (19), the power generating body (33), and the engine (34) with cooling air sucked by the engine fan (32) from the inlet port (21), and second and third cooling air passage for cooling a space surrounded by an inverter containing box (20), an engine fan cover (31), an engine cover (36) and a muffler cover (52) and a soundproof case with cooling air sucked by the recoil fan (61) from inlet ports (21b1) and (21b2) are formed. Cooling air passed through the first cooling air passage and cooling air passed through the second and the third cooling air passages are merged and discharged from an outlet port after cooling a muffler.

Abstract: The present invention relates to a gasoline generator, belongs to the technical field of motive power equipment. Wherein the gasoline engine set in an enclosed case, a permanent magnet generator is mounted on the engine housing, handle tray mounted on the fore end surface of cool air suction cover, suction cover is joined to the engine housing handle tray, joined to the suction cover, together forms the main cooling air channel for the motive power. The present invention provides a simple, compact and rational structure. Air guide plate and the cool air suction cover envelop all the high temperature parts of the engine and the generator, exhaust pipe and muffler as a whole. Cool air sucked in by the suction fan provides specific and adequate cooling for the above units/parts and then exhausted out of chamber through outlet slots.

Abstract: Problem: To improve a soundproof performance on an air intake side of a cooling structure of a construction machine without enlarging an air intake chamber. Solution: An air intake chamber (16) is provided on the air intake side of a heat exchanger (15) in an engine room (12), and a first air intake port (17) is formed in a top face of the air intake chamber (16). In the air intake chamber (16), a duct (18) independently formed as a shield member is disposed so as to partition the air intake chamber (16) into two chambers (16a), (16b), and also in a manner such that the core surface (15a) of the heat exchanger (15) is enclosed airtightly from the surrounding atmosphere.

Abstract: The present invention provides a method and apparatus for efficiently cooling a motor. Three components may be used to provide forced air through a motor and a motor bearing. An air guide plate may direct air in and out of a motor and move air through a bearing seal, a shaft, and the motor. The air guide plate also may shield the bearing from heat. A series of holes, with every other hole an inlet hole or an outlet hole, within the motor housing may be arranged in a common radial plane. The incoming air does not mix with the outgoing air. A series of fins on a rotor may move air in and out of the holes within the motor housing.

Abstract: To reduce noise caused by exhausted cooling air as well as to maintain a necessary amount of cooling air of a cooling fan. A cooling fan is positioned behind a radiator. A shroud surrounds an impeller coupled to a motor and a rotating shaft. The shroud has an inlet and an outlet in the shape of a bell mouth. The bell mouth shaped inlet has its front edge spaced from the rear surface of the radiator by a clearance D, and forms a space around its front peripheral edge. A space is formed via the space, and opens around the periphery of the shroud. The ratio A:B is 1:3 to 5, preferably approximately 1:4, where A denotes a difference between maximum and minimum diameters of the bell mouth shaped outlet of the shroud, and B notes a length of the shroud.