Abstract: A cooling structure of a water-cooled two-cycle parallel multicylinder engine includes: an exhaust port in a cylinder block; an air intake port disposed in a crankcase below the exhaust port; a water pump disposed in the crankcase in an opposite side of the exhaust port; a first cooling water passage introducing cooling water discharged from the water pump to a cooling water jacket of a cylinder head; and a second cooling water passage introducing a part of the cooling water discharged from the water pump to a cooling water jacket below the exhaust port, the second cooling water passage being provided in the crankcase.

Abstract: An engine control system for controlling the engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active is provided. The system includes: a noise vibration and harshness (NVH) limit module that determines a noise, vibration, and harshness (NVH) torque limit based on the engine speed and the vehicle speed; and a mode transition module that enables the engine to transition between the deactivated mode and the activated mode while limiting noise, vibration, and harshness based on the NVH torque limit and a requested torque.

Abstract: A combustion nailer includes a combustion-powered power source, at least one fan associated with the power source, at least one temperature sensor in operational proximity to the power source for sensing power source temperature, and a control system operationally associated with the power source and the at least one temperature sensor for disabling the power source by disabling at least one main tool function upon the sensing of a predetermined temperature threshold sensed by the at least one temperature sensor.

Abstract: A steam enhanced dual piston cycle engine utilizes a unique dual piston apparatus that includes: a first cylinder housing a first piston therein, wherein the first piston performs only intake and compression strokes; a second cylinder housing an inner power piston that forms an inner internal chamber of the second cylinder, and either a ring-shaped outer power piston surrounding the inner power piston, wherein the outer power piston forms an outer internal chamber of the second cylinder and is configured to convert engine heat into additional work, and/or an outer boiler which is configured to produce steam to be converted into additional work.

Abstract: A crankshaft support structure of an internal combustion engine, comprising a crankshaft having journal portions a saddle-shaped bearing caps respectively mounted on an undersurfaces of the journal support bases formed in a lower portion of the cylinder block in such a manner as to straddle the journal portions being accommodated in the bearing portions, whereby the journal portions are rotatably supported wherein, of the undersurface of each of the journal support bases, an undersurface portion overlapping with an edge portion of each of end faces on both sides of each of the bearing caps is formed to be a thick portion thicker than other portions, and a mount surface to be positioned on the undersurface overlapping with the thick portion of each of the bearing caps is formed along the thick portion.

Abstract: An engine balancer system is provided in which a balancer housing disposed so as to face an oil pan beneath a crankshaft is formed by joining an upper housing and a lower housing via mating faces, and the height of the mating faces is lower on a vehicle front side than on a vehicle rear side. Oil discharge holes or discharging oil that is within the balancer housing are formed in the mating faces on the higher side of the balancer housing and in the upper housing above the mating faces on the lower side of the balancer housing. This enables the position of the oil discharge hole on the lower side to be as high as possible, thereby suppressing penetration of oil into the interior of the balancer housing through the oil discharge hole.

Abstract: A slant engine for a utility engine which a cylinder is attached to the crankcase with slanted with respect to the a rotational direction of a crankshaft, comprises a reservoir oil tank formed outside of the crankcase at lower portion for reserving lubricant, a communication pipe connected to bottom portions of the reservoir oil tank and the crankcase for communicating the lubricant in the crankcase and the reservoir oil tank, and a vent pipe connected to both of the reservoir oil tank and the inside of the crankcase.

Abstract: An internal combustion engine with improved efficiency provides continuous variable displacement and/or compression ratio tuning to one of a number of fuel types to be used by the engine. By varying displacement without changing the compression ratio, the engine can be tuned to operate on a given fuel more efficiently according to the load demands on the engine. By varying the compression ratio, the engine can be converted for use with the most economical fuel type available. The engine can be of a radial configuration with an offset crankshaft and a common cam throw-piece that can be positioned on the crankshaft to change the stroke and/or compression ratio affected by one or an array of pistons. An onboard electronic control can be used to detect engine efficiency, change engine displacement and/or compression ratio, change fuel supply, and compute fuel economy.

Abstract: A pair of exhaust ports (4, 4) have flat portions (9, 9) formed on respective inner peripheral surfaces thereof and facing in directions opposite to each other. An intervening cooling water passage (14) is formed between the flat portions (9, 9) when a cylinder head (1) is cast.

Abstract: This invention relates to a method of cooling an engine for an automobile. The method operates using a predictive, feed-forward element combined with a fuzzy logic feedback controller to achieve accurate control over engine temperature. The fuzzy logic feedback is only utilized in the event that the predictive control results in a cylinder head temperature outside a predetermined range.

Abstract: An internal combustion engine in a power unit includes an oil pump that rotates by a transmission mechanism with an endless chain, and a crankcase with an opening formed by protruding walls of side walls of the crankcase in an axial direction. A drive sprocket is fitted to a main shaft of a gear transmission and a driven sprocket is fitted to a shaft end of a drive shaft of an oil pump. When viewed sideways, the protruding walls and mating faces have overlapping parts that partially overlap the driven sprocket. On the other hand, all the shaft end and the remainder of the driven sprocket are exposed inside the opening when the cover is removed. The resulting configuration improves the working efficiency in fitting an oil pump into the crankcase without reducing the rigidity of the crankcase.

Abstract: An engine with two crank shafts. One crank shaft stationary or secured to the block by conventional main bearings. The other crank shaft is referred to as the floating crank moves in a radius back and forth along one side of the stationary crank. The cranks drive each other by being geared together. A conventional piston and con rod are attached to the floating crank and drive the floating crank in both rotating and downward motions. Both of the motions rotate the stationary crank shaft. Each piston has its own floating crank shaft separate from the other pistons. The crank shafts rotate in opposite directions. The floating crank shaft operated in position by two radius rods connected between the two crank shafts, two rods from the floating crank shaft to the stabilizer rod and control rod. All of the four rods are pinned together where they meet. The other end of the control rod is connected to the stationary crank journal. The other end of the stabilizer rod is anchored in the engine block by a pivot pin.

Abstract: An gas directing/exhaust system and method are provided. The gas directing system has an gas directing mechanism. The gas directing mechanism has different embodiments. In some embodiments, the gas directing mechanism has a first pathway and a second pathway. In other embodiments, the gas directing mechanism has a second pathway and one or more first pathways located inside of the second pathway. In other embodiments, the gas directing mechanism has the first and second pathways and a third pathway inside of the second pathway.

Abstract: An apparatus includes a cylinder head and a valve member. The cylinder head is configured to be coupled to a cylinder and a gas manifold and has an interior surface defining a valve pocket. The valve member is configured to be disposable within the valve pocket such that the valve member is movable within the valve pocket along a longitudinal axis of the valve member. The valve member has a tapered portion defining multiple valve flow passages. The apparatus has a first configuration and a second configuration. When the apparatus is in the first configuration, each valve flow passage is in fluid communication with the cylinder and the gas manifold. When the apparatus is in the second configuration, each valve flow passage from the plurality of valve flow passages is fluidically isolated from the cylinder.

Abstract: The present invention provides robotic vehicles having wheeled and hopping mobilities that are capable of traversing (e.g. by hopping over) obstacles that are large in size relative to the robot and, are capable of operation in unpredictable terrain over long range. The present invention further provides combustion powered linear actuators, which can include latching mechanisms to facilitate pressurized fueling of the actuators, as can be used to provide wheeled vehicles with a hopping mobility.

Abstract: A device for translating linear reciprocal motion to rotational motion includes a reciprocating linearly moving piston with a central slot. The aperture has a set of recessed annular gears opposite each other which engage corresponding gear teeth on a cog located on a crankshaft that rotates inside the piston. Connecting braces on the crankshaft imparts an offset on the crankshaft and a corresponding lateral force on the cog, keeping the cog engaged with the recessed annular gear which imparts a rotational force upon the crankshaft.

Abstract: An oil cooling system of an air-cooled engine for cooling the oil reserved in a crankcase of the engine comprises a base plate assembled to the crankcase, an overlapping plate assembled to the base plate; an oil filter supported in the overlapping plate; and radiation fins formed on the base plate and the overlapping plate, wherein the base plate includes an inlet port for receiving the engine oil discharged from an oil pump of the engine, an outlet groove for outputting the engine oil and a first passage groove connecting the inlet port and the outlet groove, the overlapping plate includes an inlet groove opposed to the inlet port, an outlet port opposed to the outlet groove and a second passage groove opposed to the first passage groove to form an oil passage together with the first passage groove, and the base plate and the overlapping plate having through-holes where the filter outlet of the oil filter passes through for the connection with the crankcase.

Abstract: A thermostat monitoring system is provided which comprises a coolant temperature detection member for detecting a temperature of a coolant. An intake air temperature detection member detects a temperature of ambient air introduced into combustion chambers. An intake air amount detection member detects an amount of intake air. An engine speed detection member detects an engine speed; a blower switch detects a selected contacting point for driving a blower motor; and a control unit calculates a primary modeled coolant temperature and an auxiliary modeled coolant temperature based on information detected by the coolant temperature detection member, the intake air temperature detection member, the intake air amount detection member, the engine speed detection member, and the blower switch, and for monitoring using the primary modeled coolant temperature and the auxiliary modeled coolant temperature to determine whether a thermostat is in a stuck-open state.

Abstract: The present invention provides a motorcycle including a front wheel, a rear wheel, a frame supported by the front and rear wheels, a crankcase including a first interface portion and a first passageway exposed to the first interface portion, a reservoir located remotely from the crankcase adapted to contain a lubricant, and a transmission case supported by the frame and including a second interface portion and a second passageway exposed to the second interface portion. The second passageway is in fluid communication with the reservoir. The first interface portion is coupled to the second interface portion. The first passageway is in fluid communication with the second passageway. The first and second passageways provide fluid communication between the reservoir and the crankcase through the first and second interface portions.

Abstract: The present invention provides a method for controlling a compression ignition internal combustion engine, which can easily cope with a wide range of demand loads. The compression ignition internal combustion engine 1 has a first fuel 2 containing ethanol, and reforming means 5 for reforming the first fuel into a second fuel having higher ignitability than the first fuel, by converting at least one part of ethanol contained in the first fuel 2 to diethyl ether, and each amount of the first fuel and the second fuel to be supplied to the compression ignition internal combustion engine is varied, in accordance with the change of a load required to the compression ignition internal combustion engine 1. Thus, the proportion of the first fuel to the total fuels supplied to the internal combustion engine 1 is increased, with the increase of the demand load, while the proportion of the second fuel to the total fuels supplied to the internal combustion engine 1 is increased, with the decrease of the demand load.