Abstract: A carburetor arrangement of a portable handheld work apparatus includes a carburetor (1) which is fixed to a motor housing (4) of the work apparatus by elastic support elements (2, 3). A warm air channel (5) is provided for conducting warmed air (6) to the carburetor (1). At least one part of the warm air channel (5) runs through at least one support element (2, 3).

Abstract: In an engine cooling structure, an engine cover defines together with a cylinder a space connected through a cooling air inlet to a cooling air supply device. An exhaust muffler has an exhaust gas discharge opening formed near a back end part of a side, which is opposite to a side facing the cylinder, of the exhaust muffler. The opening is positioned at a height included in a vertical dimension of the cylinder. A cooling air passage, through which a cooling air taken in the space defined by the engine cover and the cylinder through the cooling air inlet flows, is formed so as to cool the cylinder and the exhaust muffler. The cooling air passage includes a main cooling passage for guiding part of cooling air used for cooling the cylinder through a space around the exhaust muffler to a space around the opening, and a cooling air bypass passage for guiding part of cooling air used for cooling the cylinder directly to the space around the opening.

Abstract: In an engine-driven handheld vacuum/blower, a first grip is provided as one part of an outer shape of an engine casing in which an engine is mounted, and a second grip is formed on a fuel tank which forms another part of the outer shape of the engine casing. The first grip and the second grip are positioned on the opposite sides of the center axis of the engine. Therefore, since there is no unbalanced load applied on either of both the hands, an operator can easily maintain the posture during operation, and can work with the vacuum/blower under good efficiency.

Abstract: An antivibration device is mounted between a motor unit (1) having an internal combustion engine (2) and a vibration-insulated unit (3) of a portable handheld work apparatus (4) such as a motor-driven chain saw, cutoff machine, suction/blower apparatus or the like. The antivibration device (5) includes a vibration damper (6) made of foamed elastic material (7).

Abstract: A generator positionable on a support surface and including a frame, an internal combustion engine coupled to the frame, an electrical energy source, a fuel tank, and an output unit. The one-piece mounting member is coupled to the frame and has mounting arms that each provide a frame mount, an engine mount, and a source mount. The internal combustion engine is coupled to the mounting member and includes an output shaft that extends through a central portion and that is substantially normal to the support surface during generator operation. The electrical energy source has a rotor coupled to the output shaft for rotation therewith, and a stator coupled to the mounting member. The fuel supply supplies fuel to the engine, and the output unit communicates with at least one of the engine and the energy source.

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 present invention provides an air-cooled four-stroke internal combustion engine capable of achieving a high degree of cooling. The present invention is directed to an air-cooled four-stroke internal combustion engine including a crankshaft and a fan rotor rotatably driven by the crankshaft to generate cooling air for cooling the engine. The engine comprises an oil pan disposed below the crankshaft. A space formed below the oil pan extends in the axial direction of the crankshaft along the lower surface of the oil pan and allows a cooling air to pass therethrough. An upstream portion of the lower surface is inclined upward, toward the upstream, in a vertical section taken along the axis of the crankshaft to receive the cooling air therein.

Abstract: A blower housing is coupleable to an engine including a cooling fan that is rotatable about an axis. The blower housing includes a first housing portion that is coupled to the engine and has an intake opening through which air may flow. The blower housing also includes a removable housing portion that is removably coupled to the first housing portion and has first and second sidewalls that direct air toward at least one engine cylinder. In one embodiment, the first and second sidewalls direct air toward different engine cylinders, in another embodiment, the first and second sidewalls direct air toward the same engine cylinder.

Abstract: An air cleaner for small internal combustion engines, including a removable or replaceable air cleaner element detachably mounted within an air cleaner cavity which is defined at least on part by the shroud of the engine. The air cleaner element includes engagement structure for releasable engagement with a wall of the air cleaner cavity to permit mounting of the sir cleaner element within the cavity, and removal of the air cleaner element from the cavity, without the use of tools. In addition, a cover is provided for releasably engaging the air cleaner cavity to cover the air cleaner element.

Abstract: There is provided a portable power working machine, which is capable of rationally and effectively preventing the generation of the icing without giving rise to early clogging of air cleaner, the malfunction of a internal combustion engine and deterioration of performance. This working machine comprises a small air-cooled internal combustion engine which is mounted inside a main housing, a cooling fan disposed on one side of the main housing; a carburetor coupled to an upper portion of an intake port of the internal combustion engine; a clean air chamber disposed on an upstream side of the carburetor; an air cleaner cover coupled to the clean air chamber; a warm air introducing passageway for introducing, through a region adjacent to the intake port, part of air which has been sucked by the cooling fan for cooling the internal combustion engine into the air cleaner cover; and a shutter for and externally opening or closing the warm air introducing passageway as desired.

Abstract: The present invention provides an air-cooled four-stroke internal combustion engine capable of achieving a high degree of cooling. The present invention is directed to an air-cooled four-stroke internal combustion engine including a crankshaft and a fan rotor rotatably driven by the crankshaft to generate cooling air for cooling the engine. The engine comprises an oil pan disposed below the crankshaft. A space formed below the oil pan extends in the axial direction of the crankshaft along the lower surface of the oil pan and allows a cooling air to pass therethrough. An upstream portion of the lower surface is inclined upward, toward the upstream, in a vertical section taken along the axis of the crankshaft to receive the cooling air therein.

Abstract: An implement is provided having a motor housing in which is disposed an internal combustion engine as a drive for a tool. The implement also includes a carburetor and an air filter. An air filter chamber is provided with a cover element that includes two cover portions, a first cover portion of which extends over the air filter chamber, and a second cover portion of which extends over a ventilated hollow space of the motor housing that is adjacent to the air filter chamber. At least one in-flow passage for the combustion air is provided and in the first cover portion opens into the air filter chamber. At least one further passage is provided for connecting the hollow space with the in-flow passage.

Abstract: An outboard motor includes a vertical multi-cylinder engine, a fly-wheel magneto device, a partition plate, and a ventilation fan. The vertical multi-cylinder engine is disposed in an engine cover and comprises a crank case and a crank shaft, the crank shaft being rotatably disposed and protruding upward from the crank case. The fly-wheel magneto device is disposed on the protruding portion of the crank shaft. The partition plate is disposed in the engine cover and partitions the inside of the engine cover into an engine air-inlet space and a space including a heat-generating source, the engine air-inlet space being disposed at the upper portion of the engine cover, and the space including a heat-generating source being disposed at the lower portion of the engine cover. The ventilation fan is disposed in the lower space below the partition plate.

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: A fan arrangement of an internal combustion engine, especially of a portable handheld work apparatus, includes a fan wheel (5) and a spirally-shaped fan housing at least partially enclosing the fan wheel. A take-out opening (13) is provided in the fan arrangement at the region of the moved air flow for diverting a combustion air flow for the engine. The combustion air flow is branched-off from the air flow. The take-out opening (13) is arranged in radial direction directly outside of the fan wheel (5) and is so configured that the take-out opening (13) defines a window (14) which, referred to the flow direction (S), has a small width at a forward edge and that the width as well as the depth of the window (14) increases to a rearward edge.

Abstract: An air cleaner system for small internal combustion engines, including a removable or replaceable air cleaner element detachably mounted within an air cleaner cavity which is defined at least in part by the shroud of the engine. The air cleaner element includes engagement structure for releasable engagement with a wall of the air cleaner cavity to permit mounting of the air cleaner element within the cavity, and removal of the air cleaner element from the cavity, without the use of tools. In addition, a cover is provided for releasably engaging the air cleaner cavity to cover the air cleaner element.

Abstract: A small internal combustion engine having user interfaces which are located proximate to one another and within a centralized portion of the engine which is easily accessible by a user, such that the user may readily identify and manipulate the user interfaces. The user interfaces include the carburetor choke and throttle controls, the carburetor primer bulb, the engine ignition key switch, the fuel shut-off valve, the fuel fill inlet and fuel tank cap, and the oil fill inlet and oil fill cap. The carburetor choke and throttle controls are configured as rotary members mounted within an upper front portion of the engine shroud, and are shaped for easy grasping by a user to control the running of the engine.

Abstract: A manually guided implement having an air-cooled internal combustion engine for driving a tool is provided. The engine is disposed in a housing, with cooling air being conveyed by a fan wheel that is fixedly held on the crankshaft of the engine and that is accommodated in a cooling air spiral case that is open toward the engine. Formed in the housing is an air inlet via which ambient air can be drawn into the cooling air spiral case. A base of the spiral case is disposed between the fan wheel and the engine and is provided with a second cooling air inlet that provides communication between the interior of the housing and portions of the cooling air spiral case that convey cooling air.

Abstract: Thrust reverser inner wall structure comprising a thermally conductive nonmetallic carbon pitch fiber honeycomb core sandwiched between a top and bottom layer. The core is adhered by a reticulated layer of adhesive to a perforated carbon fiber top layer, and adhered to a base layer of nonmetallic, nonperforated carbon fiber reinforced fabric.

Abstract: An improved structure computer heat dissipater, the heat sink base of which has four lateral walls of appropriate length with a plurality of draft guide ducts cut inward through them. The cut surfaces thereof are utilized as flow direction separators set to a particular angular arrangement to create a predetermined air flow path. Disposed on the bottom plate are thermal dissipation protuberances that collect the concentrated thermal energy developed by the heat generating electronic component in a computer. The air stream drawn in by the fan conveys the heat absorbed by the thermal dissipation protuberances along the air path formed by the flow direction separators and rapidly discharges it through the draft guide ducts.

Abstract: An engine generator has an engine and a muffler driven by the engine, both protected by an engine cover. The engine cover has a double-wall structure of an outer wall that protects the engine generator, an inner wall that forms a space for containing the engine and used as a cooling-air passage through which the engine and the muffler are cooled, and a hollow inner space formed between the outer and the inner walls.

Abstract: A snow thrower engine carburetor is covered by a heater box provided with a channel through which air passes so as to be heated by the engine's muffler. The heated airstream is changed in direction as it leaves the heater box and moves towards the carburetor whereby moisture carried in the airstream is separated therefrom before the heated air reaches the carburetor.

Abstract: An air cooled internal combustion engine with a crankshaft that rotates about a vertical axis is provided. The engine may be a single cylinder diesel motor. The internal combustion engine includes an encapsulation which surrounds a plurality of cooling air channels. A flywheel is positioned at the top end of the crankshaft and is combined with a radial blower. An air distribution housing, which is joined to a top front wall of the crank case, forms a pressure chamber of the radial blower. At least two substreams of cooling air branch off from the pressure chamber. A first substream is guided through the housing encapsulation, which surrounds the cylinder and the cylinder head. A second substream is guided in a lining on the outside of the sidewall of the crankcase and the oil pan facing the cylinder. Both substreams are collected on the downstream side and exit through a common air-extractor shaft.

Abstract: A portable power working machine which is provided with an internal combustion engine (20) and is designed to minimize the clogging of an air cleaner (31) attached to the air intake system of internal combustion engine (20). For this purpose, part of air introduced into the main housing (12) by means of the cooling fan (25) is allowed to be sucked again by the cooling fan, thereby enabling it to be recirculated through the carburetor chamber (40) and a circulating air duct (50) disposed outside the carburetor chamber (40), and at the same time, part of air introduced into the carburetor chamber (40) is allowed to be introduced from the air cleaner (31) into the internal combustion engine (20).

Abstract: A cooling air system for motor vehicles has a radiator that is arranged in a front-end area of a motor vehicle and through which a cooling air stream flows. The exhaust air stream exiting from the radiator is directed beneath the motor vehicle by outlets that are arranged on the bottom of the motor vehicle. The outlets can be covered by an air guide element. In order to create a cooling air system for motor vehicles that has a simple design and simultaneously ensures favorable guidance of the cooling air, in the case of a motor vehicle whose outlets for cooling air can be covered by an air guide element, to arrange the air guide element in such a way that the exhaust air stream flowing out of the air guide element is directed basically parallel to one of the air streams flowing around the front end of the car.

Abstract: A ventilation scheme for a rotary machine supported on pedestals within an enclosure having a roof, end walls and side walls with the machine arranged parallel to the side walls, includes ventilation air inlets located in a first end wall of the enclosure; a barrier wall located within the enclosure, proximate the first end wall to thereby create a plenum chamber. The barrier wall is constructed to provide a substantially annular gap between the barrier wall and a casing of the turbine to thereby direct ventilation air axially along the turbine; one or more ventilation air outlets located proximate a second, opposite end wall on the roof of the enclosure. In addition, one or more fans are provided for pulling ventilating air into said plenum chamber via the ventilation air inlets.

Abstract: It is an object of the invention to improve a cooling efficiency for cooling an engine generator by dividing a cooling air passage into two routes. The engine generator includes an engine, a generator, a muffler and a cooling fan, which are all enclosed in a housing. A first cooling air passage is formed adjacent to a cylinder of the engine. A second cooling air passage is formed beneath the engine, extending from the lower side of the cooling fan, passing through an area below the engine and arriving at the muffler. The second cooling air passage is formed between an oil pan and a vibration isolation support base plate, with the oil pan facing the second cooling air passage. In this way, an air supplied from the cooling fan is divided into two routes, with one cooling the cylinder head of the engine and the other the lower portion of the engine and the muffler.

Abstract: A portable power working machine includes a small air-cooled internal combustion engine, a cooling fan, and a carburetor chamber housing therein an air cleaner. A dust-separating air duct is interposed between a region close to the cooling fan and the carburetor chamber housing, the dust-separating air duct being configured to separate dust included in an intake air from air by taking advantage of an air flow, thereby allowing clean air separated from the dust to be fed to the carburetor chamber housing and allowing the dust separated from the intake air to be sucked by the cooling fan.

Abstract: An engine generator has an engine and a muffler driven by the engine, both protected by an engine cover. The engine cover has a double-wall structure of an outer wall that protects the engine generator, an inner wall that forms a space for containing the engine and used as a cooling-air passage through which the engine and the muffler are cooled, and a hollow inner space formed between the outer and the inner walls.

Abstract: The invention refers to a driving apparatus for a lawn trimmer with a two-stroke motor having an injection valve, a coupling power output, air intake and exhaust gas discharge devices and a fuel pump as well as other possible additional components. For providing a compact construction and for guaranteeing the operativeness of the motor by fuel cooling and specific air guiding, the injection valve and a cooling air fan are placed on the same side of the motor cylinder block as the output coupling with the injection valve having a nozzle jet orientation directed to the ignition plug.