Abstract: A snow vehicle includes an engine, a track belt arranged on a rear side of the engine, and a cooling water path for cooling the engine, in which the engine includes a cooling water inlet portion and a cooling water outlet portion provided on a front surface side of the engine and connected with the cooling water path. The snow vehicle is capable of improving the turning ability of the vehicle, while simplifying a cooling water path and reducing the size of the structure for cooling the engine.

Abstract: A combustion engine includes a cylinder head and a cylinder crankcase having a cylinder bore and a coolant duct formed therein. The coolant duct is disposed adjacent the cylinder bore and is a cooling system component. A cylinder head gasket is provided between the cylinder head and the cylinder crankcase. The coolant duct has a coolant duct upper end and is open toward the cylinder head gasket at the coolant duct upper end. The cylinder head gasket has a side facing the cylinder crankcase when the cylinder head gasket is installed. The cylinder head gasket has a channel formed on the side of the cylinder head gasket that faces the cylinder crankcase. The channel is in a flow connection with the coolant duct and is part of the cooling system.

Abstract: A pull-start engine includes a crankcase unit, a pull-start unit, a gearbox unit, and a lubricating unit. The crankcase unit includes a crankcase and a crankshaft. The gearbox unit includes a gearbox and a drive shaft. The pull-start unit is sleeved fixedly on the crankshaft. A surrounding wall of the pull-start unit has an inner wall surface formed with an annular inner slot communicated with a lubricant passage in the crankshaft, an outer wall surface formed with a through hole communicated with the inner slot, and two annular flanges flanking the through hole so as to define an annular outer slot therebetween. The lubricating unit includes an entrance passage formed in the crankcase and communicated with the outer slot, and a connecting passage formed in the crankcase and the gearbox and communicated with the outer slot and a lubricant passage in the drive shaft.

Abstract: In a method of operating an internal combustion engine by supplying a gaseous fuel from a gaseous fuel tank to a combustion air feed line in which a compressor is arranged to the engine, part of the gaseous fuel is added to the combustion air feed line upstream of the compressor so as to form an intense pre-mixture with the air in the compressor and additional fuel is added to the gas/air pre-mixture downstream of the compressor.

Abstract: An internal combustion engine cylinder head unit includes a number of gas flow ports extending upwardly from a fire deck. A common coolant passage extends between adjacent ones of the gas flow ports. A first coolant flow director includes a flow splitter extending downwardly into the common coolant passage so as to cause a coolant flow within the common coolant passage to remain attached upon an upper surface of the fire deck between adjacent ports. A second coolant passage runs about a radially outboard portion of the cylinder head unit, and flow in this passage is directed by a truncated bulk flow displacer extending from a rear wall of the second coolant flow passage. The second flow director causes the impingement of coolant upon both an upper surface of the fire deck and upon an outboard portion of at least one of the cylinder ports.

Abstract: An engine starting method includes maintaining a rotation speed of a crankshaft of an engine rotated by a motor at a first rotation speed, supplying fuel to the engine and igniting the fuel while the crankshaft is rotated by the motor at the first rotation speed, determining whether the fuel has been ignited in the engine, and maintaining the rotation speed of the crankshaft rotated at least by the motor at a second rotation speed that is greater than the first rotation speed upon determining that the fuel has been ignited.

Abstract: A combustion type power tool having an arrangement avoiding direct striking of a drive shaft against a cylinder head when combustion pressure is exerted. A motor is disposed at the cylinder head and includes a motor body and a drive shaft extending in an axial direction and protruding into a combustion chamber. A fan is connected to the drive shaft to be rotatable within the combustion chamber. A buffer piece made from an elastic material is supported to the cylinder head. The buffer piece is movable relative to the cylinder head in a direction substantially perpendicular to the axial direction. The buffer piece is formed with a through-hole through which the drive shaft extends.

Abstract: A multiple watt-linkage force transfer mechanism is provided for an internal-combustion engine. The force transfer mechanism comprises two “bell cranks” that are used to drive a single crankshaft through a watt linkage mechanism. Each bell crank, in turn, is driven by two pistons through corresponding watt linkage mechanisms. The watt linkages connected to the pistons enable the connection ends of the pistons to travel along substantially straight paths, significantly reducing side loads against the piston walls. Also, all four pistons preferably drive a single connecting rod. This changes the role of the crankshaft—and the corresponding strength and rigidity requirements for the crankshaft—by reducing the necessary number of rod journals and main journals on the crankshaft.

Abstract: A combustion-type power tool includes a cylinder and a combustion chamber frame disposed to surround the cylinder and movable along the cylinder. A partition wall divides an inner space of an outer frame into a first space in which the cylinder and the combustion chamber frame are disposed and a second space in which a gas cartridge cylinder is disposed and has a through-hole through which the first space and the second space are in fluid communication with each other. A plurality of ribs is formed on an outer surface of the cylinder for regulating an exhaust gas flow generated by combustion of a gaseous mixture in the combustion chamber. The ribs enable exhaust gas discharged from the combustion chamber to be directed away from the through-hole, thereby enabling the gas cartridge cylinder to be maintained at a substantially constant temperature.

Abstract: A cooling system for an engine including a cylinder head, a cylinder block, coolant inlet lines, and coolant outlet lines. Coolant inlet lines for introducing coolant respectively to the cylinder head and the cylinder block are separately formed and coolant outlet lines for discharging coolant respectively from the cylinder head and the cylinder block are separately formed. Upstream ends of the cylinder-head-side and cylinder-block-side coolant inlet lines are respectively connected to a pre-chamber having a predetermined inner space.

Abstract: A fuel conversion system having an exhaust gas generator, such as an engine or a furnace, having a heated exhaust gas outlet, a reactor vessel having a heated exhaust gas inlet in fluid communication with the heated exhaust gas outlet, having a cooled exhaust gas outlet, and containing at least one reactor tube having an exhaust gas inlet in fluid communication with the heated exhaust gas outlet, a convertible fuel inlet, and a converted fuel outlet, and a monolithic fuel conversion catalyst structure substantially centered within the at least one reactor tube and shaped to form at least one flow channel between the monolithic fuel conversion catalyst structure and an inside wall of the at least one reactor tube.

Abstract: The oil pump has a cam support plate attached to the engine block. The support plate has a pressure relief valve. An oil pump body assembly has a pair of gerotors on each side. The gerotors are attached to and driven by a shaft attached to the rear cam.

Abstract: A combustion-engined setting tool for driving fastening elements in constructional components includes a combustion chamber (14) for combusting therein a full gas-oxidant mixture, at least one guide element (20) arranged coaxially with a longitudinal axis (34) of the combustion chamber (14) for supporting axially displaceable wall (17) of the combustion chamber (14) for an axial displacement along the guide element (20) which is pivotally supported in a drag bearing (22), and a guide cylinder (12) adjoining the combustion chamber (14) in which a setting piston (11) is arranged for an axial displacement therein.

Abstract: An internal combustion engine performing its cooling by means of coolant and being capable of detecting a temperature of the coolant accurately is to be provided. In this engine, there is mounted a water outlet 3 provided with a temperature detecting means 9 for detecting a temperature of the coolant after cooling the engine, and with a rib 7 and an upslope surface 8 both of which are capable of guiding the coolant to a temperature detecting portion 9a of the temperature detecting means 9.

Abstract: An upper level sensor or the like is used to detect an amount of lubricant in an oil pan of an engine. When the amount of lubricant exceeds a prescribed value (step ST1), that is, when lubrication of a sliding portion such as a bearing is insufficient due to dilution of the lubricant with fuel, control for lowering engine output such as control for lowering a maximum combustion pressure (step ST3) is carried out, so that combustion load applied to the sliding portion such as a bearing is suppressed when the maximum combustion pressure is attained and seizure of a connecting rod bearing or the like is prevented.

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 load with the use of a single fuel. The method includes: providing fuel 2 containing an ignition enhancer for the compression ignition internal combustion engine 1; thermally decomposing a part of the ignition enhancer included in the fuel 2 to make the fuel 2 less ignitable as the compression ignition internal combustion engine has a higher demand load; and supplying the fuel having the a lower ignitability to the compression ignition internal combustion engine 1. The fuel capable of compression self-ignition is a hydrocarbon-based fuel. The ignition enhancer is one selected from the group consisting of an organic peroxide, a nitric ester, a nitrite ester and an azo compound. The organic peroxide is di-tert-butyl peroxide. The nitric ester is 2-ethylhexyl nitrate. The nitrite ester is n-pentyl nitrite.