Abstract: A utility vehicle includes: a vehicle body frame including a cabin frame portion; a loading bed tiltable between a normal position and a dumping position; and an intake unit including an intake port. The intake unit is disposed above a rear wheel and extends over a height range overlapping a height range over which the loading bed in the normal position extends, and a location of the intake unit in a vehicle width direction substantially coincides with a location of a side wall portion of the loading bed in the vehicle width direction. The intake unit is located rearward of the cabin frame portion and exposed to the outside in the vehicle width direction. The intake unit is fixed to the vehicle body frame at a distance from a trajectory along which the loading bed is tilted.

Abstract: A utility vehicle includes a plurality of ground-engaging members, a frame supported by the ground-engaging members, and a plurality of body panels supported by the frame. The utility vehicle also includes a radiator supported on a rear portion of the frame. Additionally, the utility vehicle includes an air intake assembly partially supported by an upper portion of the frame.

Abstract: An engine cylinder block includes a control valve and stratified layers defining a network internal to the cylinder block. The network includes a main feed line in fluid communication with the control valve, and branched and winding arterial channels extending from the main feed line with diameters that taper to define nozzles configured to spray coolant on sides of pistons carried within the cylinder block.

Abstract: A generator includes an elongated tubular frame, an internal combustion engine attached to the elongated tubular frame, the engine including an engine block including a cylinder and a crankshaft configured to rotate about a crankshaft axis. The generator further includes a fuel tank attached to the elongated tubular frame. The elongated tubular frame is configured to simultaneously support the internal combustion engine and the fuel tank.

Abstract: A power tool has a fan guide for straightening the flow of cooling air generated by a fan, wherein the branching passages through are provided for causing a portion of the cooling air drawn into the fan from a ventilation hole to diverge from a flow toward an exhaust port formed on a bearing guide side, and the portion of the cooling air flows toward an inlet and thereby circulates inside a housing. The branching passages through provided to the fan guide are formed so as to be inclined in the same direction as a circumferential direction so that air path resistance during actual operation (in an intermediate-speed region) does not increase.

Abstract: A cooling package for a vehicle, such as an agricultural tractor, having a heat exchanger with a fan providing air flow and a charge air cooler assembly that airflow is routed through multiple times in order to cool a compressed charge of air. As the temperature rise experienced by the cooling airflow is relatively minor compared to the initial temperature of the compressed charge of air, the airflow is initially routed through an outlet-side portion of the charge air cooler to cool the compressed charge of air towards the outlet side of the charge air cooler, and subsequently routed through an inlet-side portion of the charge air cooler to cool the compressed charge of air towards the inlet side of the charge air cooler.

Abstract: An utility vehicle includes a chassis; a ROPS that surrounds a riding space; a cargo bed that is disposed behind the riding space and is pivotably supported by a pivot of the chassis so as to be movable up and down between a normal position at which a front portion of the cargo bed is not lifted and is supported on the chassis and a dumping position at which the front portion of the cargo bed is lifted; and a pair of left and right cargo bed support portions that are attached to the ROPS, extend backward, and support side portions of the front portion of the cargo bed at the normal position from below.

Abstract: A turbofan engine assembly including an internal combustion engine in fluid communication between a compressor and a turbine, the internal combustion engine having an engine shaft, a bypass duct surrounding the internal combustion engine, and a fan drivingly engaged to the engine shaft via a gearbox, the gearbox configured to increase an output speed of the fan relative to an input speed of the engine shaft.

Abstract: A utility vehicle provided with an engine in a rear portion of a vehicle body is disclosed. The engine is provided with a cylinder head, and has an exhaust gas outlet port formed to be open in a front surface of the engine. An exhaust pipe extends forward from the exhaust gas outlet port, then curves, and extends rearward. A cover that covers a front portion of the exhaust pipe includes: a front-side portion that covers a front side of the front portion of the exhaust pipe; an upper-side portion that extends rearward from an upper end portion of the front-side portion and covers an upper side of the front portion of the exhaust pipe; and an extension portion that extends rearward from a rear end portion of the upper-side portion and covers an upper side of a front portion of the cylinder head.

Abstract: An alternator configured for use in a vehicle includes a housing, a stator located within the housing, a field coil, a regulator, and a transceiver. The field coil is positioned in proximity to the stator and is configured for rotation relative to the stator. The regulator is electrically connected to the field coil and is configured to supply the field coil with an electrical signal based on a control signal. The transceiver is electrically connected to the regulator and is configured to wirelessly receive the control signal from an engine control module of the vehicle and to transmit the control signal to the regulator.

Abstract: A gas turbine engine has a propulsion unit and a gas generating core. The propulsion unit includes a fan and a free turbine, wherein the free turbine is connected to drive the fan about a first axis. The gas generating core includes a compressor, a combustion section, and a gas generating core turbine. The compressor and the gas generating core turbine are configured to rotate about a second axis. An inlet duct is configured to deliver air from the fan to the gas generating core. The inlet duct has a crescent shaped cross-section near the fan.

Abstract: A ram air fan assembly includes an outer housing. An inner housing is located within the outer housing. A motor is attached to the inner housing. An inlet tube extends between the outer housing and the motor. The inlet tube includes a straight first portion and a curved second portion. At least one of the two portions includes a perforated portion.

Abstract: An aircraft with a fuselage that accommodates at least one air breathing propulsion engine, the fuselage having a maximum fuselage width determined in the region of the at least one air breathing propulsion engine and comprising at least one front fuselage cowling and at least one rear fuselage cowling that are each covering the at least one air breathing propulsion engine at least partly, the at least one front and rear fuselage cowlings being spaced apart from each other in a direction transverse to a longitudinal axis of the at least one air breathing propulsion engine by a predetermined cowling offset to define a dynamic air intake through which an intake air stream is supplied to the at least one air breathing propulsion engine in operation.

Abstract: An ROV includes a body frame, a plurality of seats, a cargo bed, and an air cleaner. The plurality of seats are supported by the body frame, and aligned in a width direction of the ROV. The cargo bed is disposed rearward relative to the seats, and supported by the body frame. The cargo bed includes a placement surface on which cargo is to be placed. The air cleaner is disposed rearward relative to the seats, and at least partially disposed above the placement surface. The air cleaner includes an air cleaner case, a filter element detachably disposed inside the air cleaner case, a lid detachably attached to the air cleaner case to cover a first opening. The filter element has a substantially tubular shape. The lid is disposed along an extension line of an axis of the filter element.

Abstract: An air supply mechanism of an electric vehicle includes: a first air flowing pipe; a second air flowing pipe; and an air blower configured to generate a flow of air such that the air flows through a first air inlet into a first air flowing pipe and is discharged through a first air outlet to electric component accommodating spaces, and the air in the electric component accommodating spaces flows through a second air inlet into a second air flowing pipe and is discharged through a second air outlet to a space outside a vehicle body. The first air inlet and the second air outlet are arranged higher than a first battery, a second battery, and an inverter serving as “electric components.

Abstract: A utility vehicle that includes: a chassis (1); a seat (6) provided on the chassis; a cargo bed (8) provided behind the seat; an engine (11) provided on the chassis; an intake device (101) for supplying combustion air to the engine; and a storage box (30) for storing equipment of the engine. The intake device has: an air intake duct (15) connected to the engine; an air cleaner device (21) connected to an air-intake upstream end of the air intake duct and stored in the storage box; and an extended air intake duct (16) connected to an air inlet of the air cleaner device. An air inlet (16A) of the extended air intake duct is located above a lower face (81) of the cargo bed and between the seat and the cargo bed.

Abstract: An ROV includes a body frame, a plurality of seats, a cargo bed, and an air cleaner. The plurality of seats are supported by the body frame, and aligned in a width direction of the ROV. The cargo bed is disposed rearward relative to the seats, and supported by the body frame. The cargo bed includes a placement surface on which cargo is to be placed. The air cleaner is disposed rearward relative to the seats, and at least partially exposed above the placement surface.

Abstract: Provided is an exhaust apparatus provided in a construction machine with an engine and an engine room, the exhaust apparatus capable of suppressing vibration of an exhaust gas pipe and securing required strength thereof. The exhaust apparatus includes a duct provided in the engine room, a fan to suck air into the engine room and discharge through the duct the air to an outside as exhaust wind, and an exhaust gas pipe guiding exhaust gas of the engine into the duct. The exhaust gas pipe includes a duct inner portion inside the duct and a duct outer portion connected to the duct inner portion outside the duct. The duct inner portion has a plurality of discharge holes to allow the exhaust gas to be injected into the duct therethrough and discharged to the outside together with the exhaust wind. The duct inner portion is connected to the duct.

Abstract: A construction machine includes: a lower propelling body; and an upper slewing body which is slewably mounted on the lower propelling body. The upper slewing body includes: an engine room provided with an intake opening and a discharge opening; a duct provided in the engine room so as to communicate with the discharge opening; and an exhaust gas pipe which guides exhaust gas discharged from the engine into the duct. The discharge opening and an outlet of the duct are open downward from the engine room. A portion on a distal end side of the exhaust gas pipe is inserted into the duct. The duct and the exhaust gas pipe are configured to cause the exhaust gas to be mixed with cooled air in the duct and cause the mixture of the exhaust gas and the cooled air to be discharged downward from the discharge opening.

Abstract: The cooling effect of an engine is improved. An engine, which rotationally drives a saw chain serving as a rotating tool, is provided with a crankcase, in which a crankshaft is rotatably built, and a cylinder, in which a piston coupled to the crankshaft via a connecting rod is reciprocatably built. Atop part of the cylinder is covered with a cylinder cover, and a cooling wind toward the cylinder is generated by a cooling fan attached to a projecting end of the crankshaft. The cooling wind is guided by heat-dissipating plates extending along the crankshaft. Exposing parts bulged to outside than a lateral side of the cylinder cover are provided to tips of the heat-dissipating plates.

Abstract: A method for controlling the power of an engine is provided. The method includes determining a baseline fuel amount, determining an engine cooling fan operating condition based on an engine operating parameter, determining an engine cooling fan command based on the engine cooling fan operating condition, determining an engine cooling fan power level based on the engine speed and the engine cooling fan command, determining an additional fuel amount based on the engine cooling fan power level, adding the additional fuel amount to the baseline fuel amount to create a compensated fuel amount, and providing the compensated fuel amount to the engine. An engine system, including an engine controller coupled to an engine, a fuel system and a hydraulic pump, is also provided. The engine controller includes a processor adapted to perform a set of instructions that controls the power of the engine.

Abstract: A method of modifying the oil cooling system of a diesel engine includes the steps of removing the original equipment liquid-to-liquid heat exchanger and installing a manifold having a configuration adapted to match the mounting configuration of the oil passages of the original equipment liquid-to-liquid heat exchanger. The manifold has an oil outlet port directed to a remotely mounted oil cooler. The manifold also has a water passage having a configuration that is adapted to match the mounting configuration of the water passages of the original equipment liquid-to-liquid heat exchanger. The water passage causes the entirety of the flow of water to be discharged back to the water cooling system of the engine where it is circulated by the water pump through the water cooling passages in the engine.

Abstract: An air directing device for motorcycles with an engine air cleaner bottom housing. An external air plenum forms both an engine-air intake channel and a rearward cylinder cooling channel by coupling (e.g., directly attaching) the external air plenum to an air filter. The external air plenum defining a forward-facing inlet port and an engine-facing outlet port (disposed over a portion of the rearward cylinder) with the two channels in fluid communication with the inlet port.

Abstract: A hand-held work apparatus includes an engine housing (200). An internal combustion engine (202) is arranged in the engine housing (200) and includes a cylinder (204) and a crankshaft. A fan wheel (214) is driven directly or indirectly by the crank shaft, such that the fan wheel (214) rotates about an axis A. A fan housing (216) surrounds and cooperates with the fan wheel (214). A combustion air inlet (224) is located radially outside of the fan wheel (214) for leading air to the internal combustion engine (202). Further, the combustion air inlet (224) includes a combustion air inlet port (226) and a combustion air duct (228). The combustion air inlet port (226) is provided with a first edge (230), which first edge (230) is located radially adjacent to the periphery (220) of the fan wheel (214).

Abstract: A vehicle front portion structure is obtained that can efficiently lead cooling wind to a heat exchanger. A vehicle front portion structure has: a heat exchanger; a flow path member that forms a discharging flow path that discharges airflow, that has passed through an air-side flow path of the heat exchanger, to a vehicle exterior from a downwardly-directed opening portion at a rear side with respect to the heat exchanger; and an airflow promoting structure that forms a contracted flow path that gradually becomes more narrow from a front end side toward a rear end side, and that, at the front end side, increases a speed of traveling wind that has flowed-in from beneath a vehicle floor, and that causes the traveling wind to flow-out from between the heat exchanger and the opening portion at the discharging flow path.

Abstract: An air induction device for a vehicle comprises an air cleaner integrated into a radiator fan shroud; an air inlet configured to direct air into the air cleaner; and an air outlet configured to receive air from the air cleaner for distribution to an engine of the vehicle.

Abstract: The invention discloses an air-cooling cylinder head of a gasoline engine and a gasoline engine. The air-cooling cylinder head of a gasoline engine comprises a cylinder head main body (1), and an intake passage (3), an exhaust passage (2) and a spark plug mounting hole (6) arranged in the cylinder head main body (1), a plurality of cooling fins (4) is arranged on the outer surface of the cylinder head main body (1), a combustion chamber surface (5) is formed on the inner side of the cylinder head main body (1), a longitudinally through air-cooling passage I (8) is arranged on the same side of the cylinder head main body (1) as the intake passage (3) and the exhaust passage (2), a transversally through air-cooling passage II (7) is arranged between the intake passage (3) and the exhaust passage (2), and both the longitudinally through air-cooling passage I (8) and the transversally through air-cooling passage II (7) are kept away from function holes on the cylinder head main body (1).

Abstract: A cylinder cooling apparatus for an air-cooled engine is equipped with a cooling fan provided on one end section of a crankshaft; a pair of pushrod insertion holes for air intake and exhaust valves formed in a cylinder outer circumferential wall section; a fan shroud for covering the cooling fan and for covering the cylinder outer circumferential wall section in which the pushrod insertion holes are formed; a cutout ventilating section formed in the cylinder outer circumferential wall section between the pair of pushrod insertion holes; and tunnel-shaped ventilating holes formed in the cylinder outer circumferential wall section between the pushrod insertion hole disposed on the side of the cooling fan and a cylinder bore and extending from the cylinder outer circumferential wall section on the side of the cooling fan to the cutout ventilating section.

Abstract: An engine for a portable working machine includes: a crankshaft to which the working machine is coupled; an air-cooling fan coupled to one end side of the crankshaft; a fan casing enclosing the air-cooling fan; and a bottom cover located in a bottom surface side of the engine and connected to the fan casing. Air suction ports and guide parts are provided in one side of the bottom cover, the air suction ports sucking in air supplied from the air-cooling fan, and the guide parts extending from the air suction ports to the impeller blades of the air-cooling fan.

Abstract: A blower system for an engine includes a base of a blower scroll coupled to an engine crankcase. The base has a bottom wall with an opening sized to accommodate an end of a crankshaft. The base also has a sidewall extending away from the crankcase. The blower system further includes a blower housing fastened to the base, without the use of threaded fasteners. Together the blower housing and the base form a chamber having an inlet and an outlet. Also, the blower system includes a fan within the chamber. The fan is driven by the crankshaft and is designed to direct a flow of air through the outlet of the chamber.

Abstract: A cooling device is incorporated into a V-type engine E in which a front cylinder and a rear cylinder are arranged in V-shape and a rear exhaust pipe is placed at a right side of a vehicle body. The cooling device 1 includes an intake duct and a fan. The intake duct has a suction port which opens toward the rear exhaust pipe. The fan suctions the air into the interior of the intake duct through the suction port and exhausts the suctioned air to a location distant from the exhaust pipe.

Abstract: A gas cooler for an internal combustion engine is provided that includes a gas channel for permeating with a gas flow fed to the internal combustion engine in a flow direction, and a heat exchanger inserted in the gas channel in an insertion direction, wherein the heat exchanger comprises at least one connection for feeding or discharging a fluid for cooling the gas flow, wherein the connection comprises a first connection part connected to the heat exchanger before inserting the hat exchanger into the gas channel, and a second connection part that can be connected to the first connection part from the outside.

Abstract: A method of modifying the oil cooling system of a diesel engine an engine oil supply outlet located in a horizontal plan includes the steps of removing the original equipment liquid-to-liquid heat exchanger and installing a manifold having an oil outlet port directed to a remote oil cooler and a bypass water passage providing an un-branched flow of water, whereby the flow of oil is directed to a remote oil cooler and the entirety of the flow of water in the bypass water passage is discharged back to the water cooling system of the engine without passing through an oil cooling or water cooling heat exchanger.

Abstract: A device is provided for a piece of equipment with an internal combustion engine having a crank case and a combustion space, wherein an air cooling stream is present for cooling the internal combustion engine. The device, on the one hand, is effective for cleaning of the intake air, and on the other hand, a thermal separation between tank and crank case is achieved in a simple manner. The device includes at least one recess, which is constructed open or closed, and is arranged in the crank case, and is separated from an interior of the crank case and forms air cushions.

Abstract: A cooling apparatus for a water-cooled engine includes a radiator that cools coolant that has been circulated in the engine; a radiator fan that delivers air to the radiator; a determination portion that determines whether the engine is operated under a high load; and a setting portion. If the determination portion determines that the engine is operated under a high load, the setting portion sets an operation rate of the radiator fan at a time point at which the determination portion determines that the engine is operated under a high load, to a value higher than a normal operation rate at the same coolant temperature as a coolant temperature at the time point.

Abstract: The cooling effect of an engine is improved. An engine, which rotationally drives a saw chain serving as a rotating tool, is provided with a crankcase, in which a crankshaft is rotatably built, and a cylinder, in which a piston coupled to the crankshaft via a connecting rod is reciprocatably built. Atop part of the cylinder is covered with a cylinder cover, and a cooling wind toward the cylinder is generated by a cooling fan attached to a projecting end of the crankshaft. The cooling wind is guided by heat-dissipating plates extending along the crankshaft. Exposing parts bulged to outside than a lateral side of the cylinder cover are provided to tips of the heat-dissipating plates.

Abstract: An air-cooled general-purpose engine includes: a cooling fan fixed to one end portion, protruding outward from one end wall of an engine main body, of a crankshaft; and a shroud which is mounted to the engine main body, and which defines a cooling-air path between the shroud and the one end wall, the cooling-air path guiding a cooling air blown under pressure from the cooling fan. The air-cooled general-purpose engine includes: an oil pump which pumps up an oil from an oil reservoir; and an oil-supply path which is formed in the one end wall, facing the cooling-air path, of the engine main body, and configured to guide the oil discharged from the oil pump to a valve operating chamber in a head portion of the engine main body, and a jet for jetting the oil is provided in an opening of the oil-supply path, the opening being open to the valve operating chamber.

Abstract: A vehicle includes a heat exchanger which is disposed in a cooling system, and a fan unit which forms part of a radiator grille and is constructed to generate an air flow through the heat exchanger. The fan unit has at least one fan which is constructed to generate a primary air flow, and a ring element which is constructed to generate from the primary air flow an amplified secondary air flow to the heat exchanger.

Abstract: An arrangement for cleaning of intake air for an air-cooled internal combustion engine of a motor-driven tool, such as a chain saw. The arrangement includes an air conductor surrounding a fan wheel arranged to propel intake air around an axis of the fan wheel. An inner wall of the air conductor is arranged for guiding air propelled by the fan wheel. An air nozzle for cleaning of intake air is arranged on the inner wall of the air conductor radially close to said fan wheel. The air nozzle serves as a passage way for providing cleaned intake air from the fan wheel to the engine of the motor-driven tool, wherein the air nozzle and the air conductor are manufactured in one piece.

Abstract: An engine oil cooling system having a manifold which replaces the conventional OEM oil cooler. The manifold receives hot oil from the engine and directs the oil to a filter and then to a liquid-to-air heat exchanger. The cooled, filtered oil is returned to the engine via the manifold. Particulate filtration may be achieved in the manifold at a cleanable filter screen. Provision is made for installation of various monitoring sensors, a check valve between the manifold and filter and a bleed valve in the manifold. The system may also include a by-pass which will direct oil around the heat exchanger if the oil is below a prescribed temperature or if the oil pressure differential between the inlet and outlet of the cooler is greater than a setting of a control relief valve. The system may also include provision for heating the oil using engine coolant during initial start-up.

Abstract: A motor chain saw has a motor housing with a drive unit for driving a saw chain on a guide bar. The drive unit is an internal combustion engine with a cylinder and a crankshaft extending transversely to a longitudinal axis of the motor chain saw. A drive pinion is mounted on a first end of the crankshaft. A cooling air blower with a blower wheel is mounted on the second end of the crankshaft. A cooling air stream of the blower flows transversely to the longitudinal axis of the motor chain saw about the cylinder and exits through a housing opening. A hand guard arranged between a handle and a front end of the guide bar is connected with one leg near the housing opening for the cooling air stream. In front of the housing opening a baffle element is supported on the leg of the hand guard.

Abstract: A gas cooler for an internal combustion engine is provided that includes a gas channel for permeating with a gas flow fed to the internal combustion engine in a flow direction, and a heat exchanger inserted in the gas channel in an insertion direction, wherein the heat exchanger comprises at least one connection for feeding or discharging a fluid for cooling the gas flow, wherein the connection comprises a first connection part connected to the heat exchanger before inserting the hat exchanger into the gas channel, and a second connection part that can be connected to the first connection part from the outside.

Abstract: A power unit for portable chain saws wherein an ignition coil is placed at a position so as to increase both the compactness and the cooling efficiency of the power unit. A coil support on which the ignition coil is supported is formed integratedly with a crank case; adjacent to an open port; and on a part of an external periphery of the flywheel, said second part being not enclosed by the air-guiding passage. The coil support extends from the crank case along a side of a muffler and forms an insulating gap from the muffler.

Abstract: Engine cooling structure directs cooling air, introduced into a case by operation of a fan, to a cylinder block of an engine and then discharges the cooling air out of the case through an outlet port along meandering flow passages. Case cooling structure directs cooling along the inner surface of the case. Further cooling flow passage directs the air to vertically-oriented heat radiating fins so that the cooling air flows upward along the fins and then is discharged through the outlet port. Metal cooling-fan cover is supported by the lower cover via mounting members, and a resin-made cover guide is fastened to the engine together with supporting portions and interposed between the fan cover and the engine.

Abstract: In an engine-driven power generator, a fan-equipped flywheel and a drive shaft of a power generation section are connected to a crankshaft of an engine, and the power generation section is driven by the drive shaft being driven via the crankshaft. The fan-equipped flywheel is disposed between a crankcase of the engine and the power generation section, and small- and large-diameter cooling fans for cooling the engine and power generation section are provided on the fan-equipped flywheel.

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 top plate is provided in a top portion of a cylinder block of a combustion engine of a type, provided with a cooling fan, so as to lie perpendicular to a longitudinal axis of an engine cylinder. An intake side gasket interposed between the cylinder block and an intake unit is extended upwardly to contact the top plate to thereby seal a gap between the top plate and the intake side gasket. An exhaust side gasket interposed between the cylinder block and an exhaust unit is extended upwardly to contact the top plate to thereby seal a gap between the top plate and the exhaust side gasket. A cooling passage for passing therethrough a cooling air from the cooling fan is formed by the cylinder block, the top plate, the intake side gasket and the exhaust side gasket.

Abstract: A cooling structure of an internal combustion engine includes a cylinder block having a plurality of cylinder bores; a cylinder head disposed on an upper portion of the cylinder block; two camshafts disposed on the cylinder head so as to be juxtaposed to each other in parallel to a crankshaft; camshaft housing chambers formed on the cylinder head to house the respective camshafts; a recessed portion provided between the camshaft housing chambers; a plug seat formed between the camshafts and in the recessed portion; a cooling air passage formed between the cylinder bores; and cooling air introduction passages communicating from the cooling air passage to the recessed portion of the cylinder head.

Abstract: This invention patent is a utility type of car fan controller. The controller has a housing and inside the housing is a circuit. The housing has a top cover forming a cavity and flat bottom plate. The circuit has a circuit board and an adjustment device with other electronic components. The circuit board has a socket connector and a wire harness connector. The top cover has socket connector aligned with socket connector opening. The top cover also has a wire harness connector aligned to wire harness connector socket. The modular practical new type of invention design facilitates faster assembly and more convenient flexible use.

Abstract: A power tool has a fan guide for straightening the flow of cooling air generated by a fan, wherein the branching passages through are provided for causing a portion of the cooling air drawn into the fan from a ventilation hole to diverge from a flow toward an exhaust port formed on a bearing guide side, and the portion of the cooling air flows toward an inlet and thereby circulates inside a housing. The branching passages through provided to the fan guide are formed so as to be inclined in the same direction as a circumferential direction so that air path resistance during actual operation (in an intermediate-speed region) does not increase.