Abstract: A power tool includes a combustion chamber (1; 54), a drive piston (8) adjoining the combustion chamber (1; 54) and displaceable upon combustion of fuel in the combustion chamber, an ignition device (52) for igniting the fuel in the combustion chamber (1; 54), and a cooling device (2a, 6a; 64; 70) connected with the combustion chamber (1; 54) for cooling the combustion chamber (1; 54) with a liquid cooling medium.

Abstract: A water cooling device of a vertical multi-cylinder engine includes a cylinder block (1) one side wall of which is provided with a side water passage (3) running along a longitudinal direction of the cylinder block (1). The cylinder block (1) has an interior area provided with a cylinder jacket (4). Cooling water from a radiator is introduced into the cylinder jacket (4) through the side water passage (3). The side water passage (3) has an outlet (5) toward a lower portion of the cylinder jacket (4).

Abstract: A gaseous fuel pressure regulator uses an inlet valve and an outlet valve to regulate an incoming pressure, from a gaseous fuel supply tank, and accurately control the pressure at the outlet of the regulator. The control of the outlet pressure is maintained by precise movement of the outlet valve which is controlled by an actuator. The actuator receiving pulse width modulated signals from a microprocessor in order to maintain the outlet valve in an opened, or gas flow permitting, position for a time period which is appropriate to maintain the desired pressure at the outlet port of the regulator. An inlet port maintains a pressure within a conduit, which is connected in fluid communication between the inlet port and the outlet port at an intermediate pressure which is used by the outlet valve to achieve the desired outlet pressure magnitude.

Abstract: A manually operated tool such as a parting-off grinder, chainsaw or similar device has a tank housing which contains a fuel tank. The tool has an air cleaning unit, the tank housing being connected to the clean air side of the air cleaning unit via a bleed device. A simple design in which leaks are avoided results if a reservoir wall of the tank housing and a housing wall of the air cleaning unit are positioned adjacent to one another and the bleed device comprises a bleed opening which passes through the reservoir wall and the housing wall.

Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus heats and cools the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus adjusts the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.

Abstract: A fan arrangement of a portable handheld work apparatus is driven by an internal combustion engine and includes a radial fan (1) which includes a fan wheel (5) and a spirally-shaped fan housing (6) which encloses the fan wheel (5) at least partially. A take-out opening (3) is provided in the radial fan (1) in the region of the moved air flow (2) for diverting a combustion air flow (4) for the engine. The combustion air flow (4) is branched off from the air flow (2). In the radial direction outside of the fan wheel (5), there is an aerodynamically formed guide ramp (7) provided in the air flow (2) which rises in the axial direction. The take-out opening (3) is arranged downstream of the guide ramp (7).

Abstract: The lubrication distribution system can be used whenever two chambers are separated by a wall with a source of lubrication in one chamber, a suction source in the other chamber and a pair of pathways between them for transporting oil. The oil distribution system for the internal combustion chamber uses appropriately placed ports and centrifugal force generated by a flywheel to provide lubrication for all moving parts in the engine. Oil is delivered from a sump to the cam chest. The cam chest is separated from the flywheel housing by a wall. A venturi port opening in the wall creates suction in the cam chest by virtue of the centrifugal force created by the flywheel. An air-oil mixture is circulated throughout the cam chest and through the venturi port opening. The oil mixture is circulated through the flywheel housing and returned to the cam chest through a second set of ports between the cam chest and flywheel housing.

Abstract: In a fuel gas mixer 1 including a throttle valve 4 provided in an air intake passage 2 connected to an engine for opening and closing the air intake passage 2 and a fuel gas supply passage 6 connected to the air intake passage 2 upstream of the throttle valve 4. A fuel gas control valve 5 is provided in the air intake passage 2 upstream of the connecting part of the fuel gas supply passage 6 for opening and closing the air intake passage 2, and a fuel gas control value controlling means 11 is provided for varying the degree of the opening of the fuel gas control value 5 depending upon the operating state of the engine.

Abstract: In a snowmobile, a four-cycle engine has an alternator as a generator while the snowmobile body has heat exchangers through which the cooling water of the engine is cooled by heat exchange with external air and snow, in a front part and at the ceiling of a crawler house. The alternator is positioned between the four-cycle engine and the front heat exchanger. Further, an exhaust manifold is arranged at an upper position in front of the engine body while an approximately cylindrical oil filter is provided under the exhaust manifold and inclined forwards in the vehicle's direction of travel.

Abstract: A crankcase scavenged internal combustion engine includes a cylinder and a piston reciprocating along the cylinder wall. At least one auxiliary duct is arranged with an auxiliary port in the cylinder wall. An inlet is divided into: a fuel inlet leading to a fuel port and an air inlet leading to an air port. The auxiliary port, fuel port and air port can be opened and closed by the piston. The piston also comprises a transfer space, which mouth edges are limited by the piston periphery, and which, in at least one piston position, creates a connection between the fuel port and the auxiliary duct's port, so that fuel can be supplied to the auxiliary duct via the auxiliary port, and then, after the port later on has been opened by the piston, can flow into the combustion chamber.

Abstract: A lubricating system for a 4-cycle engine reduces overall engine size and number of parts, and simplifies engine structure. The engine includes a side cover bonded to the crankcase defining a first valve-operating chamber, and a head cover bonded to the cylinder block defining a second valve-operating chamber. Oil reservoir chambers are formed in the crankcase and the side cover. Oil supply passages are provided in the crankshaft to permit a portion of each oil reservoir chamber below an oil surface therein to communicate with the crank chamber so that the oil passed through the oil supply passages is scattered by rotation of the crankshaft to produce an oil mist. The crank chamber communicates with the first valve-operating chamber through a one-way valve. A recovery bore opens into the second valve-operating chamber for recovering oil and communicates with each of the oil reservoir chambers above the oil surface.

Abstract: A method for adjusting coolant temperature in an internal combustion engine (2), whereby the coolant circuit thereof contains an electrically driven coolant pump (3) and an electrically controllable bypass valve (4). If the setpoint value of the coolant temperature changes in an abrupt manner, the rotating speed of the coolant pump (3) rises during the short interval in order to reduce the dead time required for adjustment. A Smith controller, which takes into account dead times of the system, is used to regulate the bypass valve.

Abstract: In a fluid passage structure of an internal combustion engine wherein oil flows from an in-block flow passage formed in a cylinder block to an in-head flow passage formed in a cylinder head, a groove that is generally rectangular in cross section is so formed in a top face of the cylinder block as to extend from a position corresponding to an opening of the in-block flow passage formed in the top face to a position corresponding to an opening of the in-head flow passage formed in a bottom face of the cylinder head, by machining or the like. Thus, a flow passage arrangement in which the openings of the flow passages are offset from each other is allowed. As a result, the degree of freedom in designing the fluid passage structure is enhanced.

Abstract: A connector assembly including the resilient member and two band clamps includes a feature for preventing the band clamps from overlapping with each other when the band clamps are tightened. The band clamps can include projections extending from an outer surface thereof in order to prevent the band clamps from overlapping with each other. Alternatively, one of the members that are being connected via the connector assembly can include an additional member configured to be aligned with a projection on one of the band clamps.

Abstract: The invention relates to a cylinder block of the closed-deck type, which can be produced by die-casting. The cylinder block includes a water jacket surrounding the cylinders adapted to be open to the side. The lateral opening can be closed by a cover, which is additionally shaped on its inside in such a way as to promote flow distribution or heat dissipation.

Abstract: A device for liquefying fuel fractions which are in vapour form in fuel tanks (1), having a suction device (10), a pump (13), a condensation device (16) and a separation and storage device (18). This device has a regulation device, with the aid of which the fraction-air mixture (31), which is displaced by the fuel (30), flowing in during the refuelling of the fuel tank (1) and/or a fraction-air mixture (31) which is produced by air injection by means of an air-injection device (23) can be sucked out and separated.

Abstract: A connecting piece (1) is disposed between a carburetor (4) and an inlet channel (3) in an internal combustion engine of a portable handheld motor-driven work apparatus. The connecting piece functions to compensate for relative position changes between the engine and the carburetor (4), is made of elastic material and includes an expansion fold (5) for compensating for changes in position. The length of the expansion fold (5) is changeable from a collapsed to an expanded length. The expansion fold (5) subdivides the connecting piece (1) into a carburetor-end channel section (6) having a circularly-shaped cross section and an engine-end channel section (7) having a cross section departing from the circular form at the end facing toward the engine. The connecting piece (1) has a constant flow cross section over its entire length when the expansion fold (5) is collapsed.

Abstract: The invention provides an on-board fuel feed system for a motor vehicle, including a fuel tank and device for introducing additive into the fuel, the device comprising an additive tank and pumping device for pumping the additive to direct it to an introduction point for introducing the additive into the fuel, wherein the additive tank is housed inside the fuel tank.

Abstract: There is provided a control method for a premixed compression ignition internal combustion engine, which is capable of responding easily to a sudden change in operating conditions. In a control method for a premixed compression ignition internal combustion engine 5 in which a gaseous mixture of an oxygen-containing gas and a fuel is compressed and self-ignited within a cylinder, cyclohexene is mixed with the fuel to be supplied to the premixed compression ignition internal combustion engine according to the operating conditions of the internal combustion engine.

Abstract: A cooling apparatus of an internal combustion engine includes a closed deck-type cylinder block and an insert. The cylinder block includes a water jacket and an upper deck including a water hole formed therein. The insert is disposed in the water jacket and inserted into the water jacket through the water hole. The insert is fixed relative to the cylinder block at a water hole portion such that the insert is fixed in position in a flow direction of the cooling water. A stopper for preventing the insert from moving downstream in a flow direction of the cooling water may be formed, and the insert engages the stopper such that the insert is fixed in position in the flow direction of the cooling water.