Abstract: The invention provides to a cooling system and a method of cooling an engine-driven generator. The engine-driven generator includes an engine, a current generator, and a housing. The engine includes an engine air intake, and the current generator includes a generator air intake. The housing includes a first outlet, a second outlet, a first air passageway, and a second air passageway. The first air passageway is in communication with the second air passageway. The second air passageway partitions air into a first stream supplied to the engine air intake and a second stream supplied to the generator air intake. The first stream exits through the first outlet, and the second stream exits through the second outlet.

Abstract: A system for a flywheel assembly for use in conjunction with an internal combustion engine is disclosed. The flywheel assembly includes a flywheel in rotational association with a crankshaft of the internal combustion engine. The flywheel assembly further includes a cooling fan mounted over the flywheel, and capable of rotation therewith. The cooling fan and the flywheel are secured in a constant axial position relative to the crankshaft by virtue of a drive-cup and a retaining nut. Further, the flywheel includes a plurality of integrally formed, intersecting support ribs, for providing excellent dynamic stiffening (e.g., damping) capabilities to the flywheel assembly for substantially reducing and/or eliminating radiated noise.

Abstract: An air-cooled V-shaped engine comprises a throttle body (10) and a flow-dividing plate (9) arranged ahead of a central cooling-air passage (8). The flow-dividing plate (9) is provided in a fan case (5) at a position forwardly of the throttle body (10) and has a bottom-plate portion (14) disposed at a position lower than the throttle body (10). The flow-dividing plate (9) divides the cooling air generated by an air-blowing fan (7) toward left and right sides of the central cooling-air passage (8). In this air-cooled V-shaped engine, the fan case (5) has a ceiling wall a central portion (11) of which is positioned just above the bottom-plate portion (14) of the flow-dividing plate (9). The central portion (11) of the ceiling wall of the flow-dividing plate (9) is provided at a position higher than the throttle body (10) as well as the central side portions (12), (12) of the ceiling wall, led out of the central portion (11) in a left and right directions.

Abstract: The invention relates to a fan drive device (1) for driving at least one fan impeller (2), comprising at least one first drivable coolable housing element (9, 10) with at least one output disc (13) which can be connected to the at least one drivable coolable housing element (9, 10) in such a way as to be capable of transmitting torque by fluid friction, wherein at least one fluid can be admitted to at least one torque-transmitting space, and the mass flow of said fluid can be regulated by means of a valve element (30), wherein the valve element (30) can be actuated by at least one actuator (26, 27), and at least a section of the actuator (26, 27) is arranged in at least one retaining element (33) for fastening to a motor unit.

Abstract: An air-cooled engine (10) has a fan cover (16) for covering a cooling fan (14). The cover (16) is composed of a fan-cover peripheral wall (44) for covering the outside of the cooling fan (14), and a top board (45) for closing off one end of the fan-cover peripheral wall (44). The fan-cover peripheral wall (44) has an internally disposed guiding duct (47) for guiding cooling air (Wi) from the cooling fan (14) to an engine main body (12). A first fastening member (42) secures a portion of the external part of the fan-cover peripheral wall (44) that is proximal to the guiding duct (47) to a casing (25) of the engine main body (12). A second fastening member (41) extends from the casing (25) and through the fan-cover peripheral wall (44), and secures a top board (45) in a portion that is at a distance from the guiding duct (47).

Abstract: A cooling structure for a working vehicle with a transmission disposed rearwardly and downwardly of a driver's seat and having a hydrostatic transmission, and an air-cooled engine disposed rearwardly of the transmission. The cooling structure comprising a fan for cooling the engine and a fan for cooling the transmission mounted on a rotary shaft operatively connecting the transmission with an output shaft of the air-cooled engine, the fans being configured such that air flows generated by the fans move from adjacent the transmission toward the engine; an oil cooler for cooling fluid supplied to the hydrostatic transmission, the oil cooler being disposed between the fan for cooling the engine and the fan for cooling the transmission, and disposed to face each of the fans; and an air guiding plate disposed at a position higher than the oil cooler for guiding air to regions of the fans.

Abstract: A duct member is disposed around outer peripheries of an engine and an engine-driven generator to define a continuous cooling-air passage between the duct member and the outer peripheries. A cooling fan is disposed in the cooling-air passage to generate a flow of cooling air from one end of the cooling-air passage to the other end during operation of the engine. An intake box is connected to one end of the cooling-air passage and has an air-intake port. A muffler box is connected to the other end of the cooling-air passage, has an air-discharge port, and accommodates an exhaust muffler of the engine. A sound-insulating housing is connected between the intake box and the muffler box to surround the duct member in order to insulate sound emitted from the duct member.

Abstract: In a system for controlling a general-purpose internal combustion engine having two cylinders each equipped with a throttle valve and a fuel injector, and a cooling fan that sucks in and blows air onto the cylinders, there are provided a throttle driver that drives the throttle valve of each cylinder to open/close, an injector driver that drives the injector of each cylinder to open and a controller that controls operation of the throttle driver and injector driver in such a way that the throttle opening and an amount of fuel to be injected are different for each cylinder, such that an engine speed becomes constant, thereby enabling to obtain desired output characteristics.

Abstract: The invention relates to a cooling system for a motor vehicle comprising a first heat exchanger (1), in particular, embodied in the form of a main cooler for cooling a first liquid coolant (3) of an internal combustion engine (2) by means of an air flow coming from the ambient air and a second heat exchanger (7, 13, 407, 415) for cooling gases introduceable into the internal combustion engine, in particular, exhaust gases and/or charge air, wherein the second heat exchanger (7, 13, 407, 415) is coolable by the an air flow coming from the ambient air and is spatially separated from the main cooler (1).

Abstract: A cooling system for cooling a plurality of heat producing systems includes a heat exchanger having a plurality of cooling zones, each of which has a respective inlet and outlet for facilitating flow of a respective temperature control fluid therethrough. Each of the respective temperature control fluids facilitates temperature control of a respective heat producing system. A plurality of fans cool the temperature control fluids flowing through the heat exchanger, and a fan or fans are disposed proximate each zone of the heat exchanger to provide air flow substantially independently from the air flow over the other cooling zones.

Abstract: A duct member is disposed around outer peripheries of an engine and an engine-driven generator to define a continuous cooling-air passage between the duct member and the outer peripheries. A cooling fan is disposed in the cooling-air passage to generate a flow of cool air from one end of the cooling-air passage to the other end during operation of the engine. An exhaust muffler of the engine is disposed in the vicinity of the other end of the cooling-air passage. An air guide plate is connected to the duct member and is suspended from an upper portion of the duct member to cover an upper portion of one side face of the exhaust muffler which is opposite the cooling-air passage so that the air guide plate guides the cooling air flowing out of the cooling-air passage downward along the one side face of the exhaust muffler.

Abstract: An engine and a generator driven by the engine are resiliently supported on a frame. A duct member is integrally attached to the engine and the generator to define a continuous cooling-air passage between the duct member and outer peripheral surfaces of the engine and the generator. A cooling fan is disposed on an inlet side of the cooling-air passage. A silencing plate is integrally attached to the duct member and faces an inlet of the cooling-air passage with a ventilation gap defined therebetween. The silencing plate has an area opposing the inlet that is larger than an opening area of the inlet.

Abstract: An engine-driven work machine is provided in which an engine/work machine unit (5) and an exhaust muffler (23) are housed in a box (30), the box (30) is provided with a cooling air passage (44) that passes the area around the engine/work machine unit (5) and the exhaust muffler (23), and a cooling fan (15) driven by the engine (2) is disposed in the cooling air passage (44), wherein the box (30) is provided with blocking means (51) for blocking the cooling air passage (44) between the engine (2) and the exhaust muffler (23) when running of the engine (2) is stopped. The heat of the high temperature exhaust muffler can thus be prevented from affecting the engine/work machine unit even when running of the engine is stopped, while maintaining the soundproofing of the box housing the unit, etc.

Abstract: An air-cooled V-shaped engine comprises a throttle body (10) and a flow-dividing plate (9) arranged ahead of a central cooling-air passage (8). The flow-dividing plate (9) is provided in a fan case (5) at a position forwardly of the throttle body (10) and has a bottom-plate portion (14) disposed at a position lower than the throttle body (10). The flow-dividing plate (9) divides the cooling air generated by an air-blowing fan (7) toward left and right sides of the central cooling-air passage (8). In this air-cooled V-shaped engine, the fan case (5) has a ceiling wall a central portion (11) of which is positioned just above the bottom-plate portion (14) of the flow-dividing plate (9). The central portion (11) of the ceiling wall of the flow-dividing plate (9) is provided at a position higher than the throttle body (10) as well as the central side portions (12), (12) of the ceiling wall, led out of the central portion (11) in a left and right directions.

Abstract: The purpose of the present invention is to improve cooling efficiency of a cylinder head of an air-cooled engine. With regard to the construction that a cooling fan is provided at one of ends of a crankshaft, and cooling air from the cooling fan is guided to a cylinder head 4 so as to cool the cylinder head 4, an intake manifold 8 is arranged above the cooling fan, a duct 51 is provided at the lateral center of the intake manifold 8 so as to suck air from an air cleaner, cooling air is sent from both sides of the duct 51 to an intake valve, an exhaust valve and an injection nozzle arranged in the cylinder head 4, and a shielding plate 55 is provided at one of lateral sides of the duct 51.

Abstract: To achieve improved cooling in a power unit, a first fan is coupled with an end of a crankshaft of an internal combustion engine to cool at least a cylinder of the internal combustion engine, and a second fan is coupled with another end of the crankshaft to cool at least the cylinder. The cylinder is cooled by the air supplied from the first fan and the second fan.

Abstract: A system for cooling a vehicle engine room is provided that comprises: a heater blower provided around a dash panel of the vehicle and configured to be able to send external air to the engine room and a cabin of the vehicle; and a control unit to control the heater blower such that the external air may flow into the engine room through the heat blower if the temperature of the engine room is higher than or equal to a limit temperature above which components in the engine room can be heat damaged.

Abstract: A portable 4-cycle engine with a configuration which allows cooling air to flow in the direction of the crankshaft relative to a cylinder head on a cylinder, and a portable machine equipped with this engine, are provided, respectively. In such an engine, the cylinder is separated from the cylinder head including a combustion chamber formed at the cylinder side therein. The engine further comprises a valve train area formed in the cylinder head at the downwind side of the cooling air, and a plurality of vertical fins protruding upward from the cylinder head and extending in the direction of the crankshaft. The valve train area and the plurality of vertical fins are all integrally formed with the cylinder head, so that the cylinder head can be made thinner and lighter with high rigidity to enable the portable machine to become smaller, lighter, and more powerful.

Abstract: A cooling system is provided for a vehicle having an engine. The cooling system includes a pair of heat exchangers, such as an oil cooler and a charge air cooler, laterally spaced apart from each other and located in front of a front end of the engine. A pair of blower units are in front of the coolers and blow cooling air rearwardly therethrough. A pair of duct units are located above the engine and to the rear of the coolers. Each duct unit includes a forward opening inlet receiving warmed air from the corresponding cooler, an upwardly opening outlet and a hollow housing extending from the inlet to the outlet. The outlets are spaced laterally apart from each other. A radiator is positioned above the duct unit housings and forward of the outlets. A set of radiator fans blow air upwardly through the radiator and are positioned between the radiator and the duct housings.

Abstract: A fan assembly for an agricultural tractor includes a rotatable fan mechanically driven by a drive shaft coupled to an internal combustion engine. A fan shroud encloses the outer periphery of the fan and is mechanically connected to the engine. A bearing is mounted on the drive shaft and supports the fan shroud so that the drive shaft is rotatable with respect to the fan shroud. The bearing prevents radial and axial movement of the fan shroud relative to the drive shaft. A fan housing is connected to a radiator which is connected to the engine. The fan housing is coupled to an end of the fan shroud by a friction coupler which prevents rotation of the fan shroud.

Abstract: The method provides hydraulic pressure for mechanical work from an engine lubricating system in an internal combustion engine by supplying oil to an engine lubrication gallery for lubricating the engine and to at least one variable oil demand accessory. Each of the variable oil demand accessories has an individual pressure regulator. The output of the variable displacement pump is regulated based on the sum of fluid flow required by the engine lubricating system and the engine accessories, regardless of the engine output. The demand for fluid is determined by the individual pressure regulators on each of the engine accessories. In a preferred embodiment, an accumulator stores high-pressure fluid to be used to power the hydraulic accessories.

Abstract: The present invention relates to control of a fan during which the power of the fan is determined from the characteristic curves of the fan motor, the operating parameters of the cooling system and the reference variables which are predefined in the form of temperature levels. The various temperature levels which are to be set have different associated characteristic curves for actuating the fan motor. If the reference variable for the control changes, this also means a change in the characteristic curves for actuating the fan motor. In order to prevent the fan motor from whining, the operation of the fan motor is kept constant for a settable minimum waiting time when the reference variable for the control of the fan changes.

Abstract: The invention provides a method and construction of vibration control supporting a cooling fan cover.

Abstract: A magnet wheel (1) for an internal combustion engine, especially a drive motor (2) for a portable handheld work apparatus includes a hub (4) for fixing to a crankshaft (5) of the drive motor (2) and a magnet carrier (6) having at least one magnet holder (7) provided peripherally on the magnet wheel (1). The magnet carrier (6) is a sheet-metal packet (9) of lamella-like layered plates (8). The sheet-metal packet (9) is layered modular-like from at least two differently configured profiled sheet-metal piece types (10, 11, 12). At least one profiled sheet-metal piece type (10) is configured as an arm plate (13) with a hub section (14) as part of the hub (4) as well as an arm section (15) which extends from the hub section (14) radially outwardly up to the region of the magnet carrier (6). At least one additional profiled sheet-metal piece type (11) is configured as a centrifugal mass sheet-metal piece (16) which lies essentially radially outwardly in the peripheral region of the magnet carrier (6).

Abstract: The present invention provides an engine assembly including an engine housing, a fan that generates an airflow, a fan housing at least partially covering the engine housing and the fan to direct the airflow over the engine housing, and a fuel tank including a plurality of integrally-formed projections engaging the fan housing to couple the fuel tank to the fan housing.

Abstract: An electric motor assembly including an electric motor and a flywheel assembly. The electric motor includes a rotatable shaft, at least a portion of the shaft being tapered as the shaft extends from the electric motor to an outer end of the shaft, the outer end of the shaft being threaded to receive a securing member. The flywheel assembly, which optionally includes a pulley and/or fan, includes a bore extending through a center of the flywheel assembly, at least a portion of the bore being tapered as the bore extends from an inner periphery facing the electric motor to the outer periphery of the flywheel assembly. The shaft of the electric motor extends through the bore of the flywheel assembly such that the taper of the shaft and the bore center the flywheel-pulley assembly on the shaft and create a self-holding taper arrangement. A securing member can be secured onto the outer end of the shaft to fix the flywheel assembly axially. Methods of forming and use are also provided.

Abstract: An apparatus and method are provided for facilitating the cooling of engine coolant flowing through a radiator operatively connected to the engine of an engine-driven, electrical generator set. The engine has a crankshaft rotatable about a first axis and a radiator having a first side directed towards the engine and a second side. The apparatus includes a fan positionable on the second side of the radiator that is rotatable about a second axis generally parallel to and vertically spaced from the first axis. The apparatus includes a thermally responsive clutch having a driven portion. The clutch is movable between a first disengaged position wherein the driven portion is isolated from the crankshaft and a second engaged position wherein the driven portion rotates in unison with the crankshaft in response to a predetermined temperature. A fan drive system interconnects the driven portion of the clutch and the fan for translating rotation of the driven portion to the fan.

Abstract: A liquid-cooled, vertical shaft type combustion engine is provided with a duct utilizing a stream of cooling air induced by a cooling fan to cool various parts of the combustion engine. The combustion engine includes an engine body, a crankshaft accommodated in the engine body so as to extend in a vertical direction, at least one engine cylinder head disposed at a front portion of the engine body, a radiator mounted above the engine body for circulating an engine coolant, a duct positioned below the radiator, and a cooling fan operatively accommodated within the duct. The duct has at least a front discharge opening and side discharge ports defined in a peripheral wall for discharging a stream of cooling air induced by the cooling fan, in a direction forwardly of the engine body and in a direction slantwise forwardly of the engine body.

Abstract: The invention involves a vehicle with a cab. The environment of the cab may be maintained by a heating, ventilation, and air-conditioning (HVAC) system that will provide cool air to the cab in hot weather and warm air to the cab in colder weather. The HVAC system will have its own specific air heating and cooling components. The HVAC has a supply to the cab for providing the cool or warm air depending on the need. A siphon or alternative point of distribution of the HVAC output may be a HVAC diversion line that leads into the inlet of the turbocharger or supercharger of the vehicle engine to mix with ambient air entering the turbocharger. In an alternative embodiment, a compressed air source may be bled into the turbocharger or supercharger inlet.

Abstract: An intake system for the combustion air of a motor of a hand held implement is provided. The system includes an air filter and a centrifugal separator. The air filter has a dirt chamber and a clean chamber that is separated therefrom by a filter medium. The clean chamber is fluidically connected with a carburetor of the motor to convey combustion air to the motor. The centrifugal separator splits the air stream into a core flow having low particle density and a peripheral flow having high particle density. The centrifugal separator includes at least two cyclones, wherein the discharged flows from the cyclones are respectively combined in pairs and open out into a common suction tube.

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 low drag fan assembly is provided which is adapted to be mounted within a ducting conduit of a ram air induction system of a vehicle for cooling a heat exchanger. The assembly includes a motor having an output drive; a motor bracketing system attached to the motor for suspending the motor within the ducting conduit; a fan hub attached to the output drive; and a plurality of foldable fan blades hingedly attached to an outer perimeter of the fan hub. When the motor is not activated, the plurality of fan blades are folded back in a non-deployed state which is generally longitudinally congruent to the airflow within the ducting conduit. When the motor is activated, the plurality of fan blades radially extend to a deployed state generally normal to and transverse to the airflow within the ducting conduit.

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: A method of providing hydraulic pressure for mechanical work from an engine lubricating system in an internal combustion engine by supplying oil to an engine lubrication gallery for lubricating the engine and at least one variable oil demand accessory. Each of the variable oil demand accessories have individual pressure regulators. The output of the variable displacement pump is regulated to the sum of fluid flow required by the engine lubricating system and the demand for fluid generated by the individual pressure regulators on each of the engine accessories, regardless of the engine output.

Abstract: The present invention provides a fan installation for a cooling system of a motor vehicle, comprising at least two fans which respectively have an electric fan motor arranged in a separate housing and a fan wheel which can be driven by the fan motor. The fan installation also comprises a control unit for operating the fan motors. The invention provides for an improved fan installation with a simple and cost-effective design, which is achieved by arranging the control unit in the housing of one of the fans for operating both fan motors.

Abstract: A ducted fan integrated power plant unit having a propeller with a central blade wheel comprises a ducted fan stator, which stator includes an outer ring having the central air intake guide ring, an inner ring; stator guide blades connecting the outer ring and the inner ring and a fixing support, a propeller, which includes main blades, a retaining ring, the later has central conical blades, between which guide openings are formed, and an engine and a fuel tank etc. When they are mounted together, the inner ring opening of the stator can be communicated with the guide openings, thereby the air flow volume is increased and air stream can be also guided to be exhausted towards the rear by these openings, at the same time the crankcase of the engine can be effectively cooled and the power and propulsion of engine can be increased.

Abstract: A ventilation assembly for a motor vehicle comprising first and second motor fan units (1, 2) and a control device (5) adapted to vary the ventilation power (P1+2) developed by the assembly formed by the two motor fan units according to a desired total power value (PTC). The control device (5) comprises an electric power variator (7) with continuous power variation, connected to the first motor fan unit (1), and a means for cutting-off the supply of the second motor fan unit (2), the power (P2) developed by the said second motor fan unit (2) being either zero or equal to its maximum operating power (PM2).

Abstract: A control system and method for operating a cooling fan in a coolant system of fuel cell power plant having a high temperature coolant loop and a low temperature coolant loop. The fan controller generates a fan control signal based on a first control signal from the high temperature coolant loop and a second control signal from the low temperature coolant loop. The first control signal is a function of the waste heat energy in the high temperature coolant loop, and the second control signal is a function of the temperature in the low temperature coolant loop. The fan control signal may also be generated based on a third control signal which is a function of a localized ambient temperature such as the under hood temperature of a vehicle.

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: The invention relates to an intake system (1) for the combustion air (2) of an internal combustion engine (3) in a portable handheld work apparatus (4). The intake system (19) includes a filter housing (5) having an air filter (6) for purifying the combustion air (2). The clean space (8) of the air filter (6) is fluidly connected to an outlet opening (10) of the filter housing (5). The outlet opening (10) communicates with a carburetor (7) of the engine (3). A centrifugal-force separator (13) is mounted forward of the air filter (6) for separating large amounts of dust in the inducted combustion air (2). The separator (13) is so positioned ahead of the filter housing (5) that a central core flow (14) of the separator has a lower particle density (15) and is supplied to the filter (6). A tangential flow (16) surrounds the central core flow (14) in the interior of the separator (13).

Abstract: A two-stroke internal combustion engine is disclosed capable of reducing the number of pieces constituting the main body, thereby making it possible to reduce the number of parts such as assembling bolts and hence to reduce the manufacturing cost as well as the weight thereof while ensuring the rigidness of the main body. The main body of the engine includes a cylinder portion in which a piston is adapted to be fittingly inserted and a crankcase portion in which a crank shaft is rotatably supported via a bearing wherein the crankcase portion is constructed such that it is split into an upper and a lower crankcase portion by a horizontal plane which passes through a central axial line of the crankshaft, where the upper crankcase portion is integrated with the cylinder portion, thus forming an integral cylinder-case, and a fan case base is formed integral with the lower crankcase portion.

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.

Abstract: The invention relates to a portable, hand-operated working machine (1) with a tool which is rotatable by an engine through a driving shaft (20), and a transmission comprising a centrifugal coupling, a driving belt (8) and a driving wheel with a groove (7) for the driving belt fitting in said groove, which driving wheel comprises an outer (3) and an inner (4, 4′) half of the driving wheel, wherein the outer half (3) of the driving wheel consists of an inner wall of a coupling drum (11) being part of the centrifugal coupling, which drum is rotated by the driving shaft when the centrifugal coupling is in the operative state.

Abstract: A manually guided implement having an air-cooled internal combustion engine for driving a tool is provided. Disposed between an output shaft of the internal combustion engine and the tool is a centrifugal clutch, whereby a flywheel portion of the clutch and a fan wheel are fixedly disposed on the output shaft. The flywheel portion is secured on a suction side of the fan wheel that is provided with guide vanes.

Abstract: The invention relates to an intake system (1) for the combustion air (2) of an internal combustion engine (3) in a portable handheld work apparatus (4). The intake system (19) includes a filter housing (5) having an air filter (6) for purifying the combustion air (2). The clean space (8) of the air filter (6) is fluidly connected to an outlet opening (10) of the filter housing (5). The outlet opening (10) communicates with a carburetor (7) of the engine (3). A centrifugal-force separator (13) is mounted forward of the air filter (5) for separating large amounts of dust in the inducted combustion air (2). The separator (13) is so positioned ahead of the filter housing (5) that a central core flow (14) of the separator has a lower particle density (15) and is supplied to the filter (6). A tangential flow (16) surrounds the central core flow (14) in the interior of the separator (13).

Abstract: A model helicopter includes a body and an engine mounted in the body. A rotor is connected to the engine through a substantially vertical primary shaft. A radial fan cools the engine while a lateral opening is provided on a tail boom connected to the body. Air is sucked in from outside of the body by a radial fan in the body, with the air flowing through the lateral opening and being directed to the tail boom through a channel. This air imparts a torque on the body that counter-acts the torque transmitted by the drive for the rotor on the body. The radial fan includes two impellers, which are coaxially mounted on the primary shaft. The air displaced by the second impeller flows through the engine, while flowing through the body, and dissipating the heat from the engine. A separation wall is provided between the two impellers of the radial fan.

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: In an arrangement for mounting a fan motor on a heat exchanger comprising a body extending between two heat-exchange fluid tanks connected together by tubes carrying cooling fins and in which a heat-exchange fluid flows, the motor is fixed to a support at least one portion of which is molded onto the body. The motor is preferably fixed to the support by at least one screw, for example a self-tapping screw, screwed into the support. The molded material is preferably a plastics material.

Abstract: A bracket assembly and method for positioning a cooling fan thermostat on a motorcycle engine so that the mounted thermostat is more responsive to actual changes in engine temperature. The bracket mounts on the engine's engine block near the base of the cylinders and positions the thermostat close to the cylinders' cooling fins. This positioning leaves the thermostat well below the lines of air flowing from the fan and prevents the thermostat from cooling before lowering the engine temperature below the preset maximum level. This positioning also leaves the thermostat closer to the cylinders which are the most significant sources of heat in the engine, making the thermostat more convectively responsive to the engine's actual temperature.

Abstract: In a working engine including a bearing mounted on an outer wall of a crankcase for carrying a crankshaft, an oil seal mounted on the outer wall of a crankcase and disposed outside and adjacent the bearing, and a cooling fan which is attached to an outer end of the crankshaft adjacent the oil seal with its blades turned toward the crankcase and which has blades protruding toward the crankcase, a cylindrical protective tube is formed on an outer sidewall of the crankcase to cover ends of bosses of the cooling fan, and a foreign matter-beating piece is formed on the cooling fan 16 in proximity to an outer peripheral surface of the protective tube. Thus, even if a long foreign matter drawn in by the cooling fan such as a weed and the like has been entangled around the crankshaft, it can be beaten and loosened, or cut by the foreign matter-beating piece rotated along with the cooling fan.