Abstract: A mower capable of reducing noise generated by rotation of a cutter blade containing an upper cutter blade and a lower cutter blade inside a housing. The lower cutter blade has a wing portion and a wing chamfered portion. The wing portion overhangs upward from a second rear end portion of the lower cutter blade on an opposite side in a rotational direction, at both end portions in a longitudinal direction. The wing chamfered portion is chamfered so that a wing outer end portion of the wing portion is inclined from an upper surface to a lower surface.

Abstract: This brush cutter includes: a drive unit; a working unit which is driven by power of the drive unit; a shaft which transmits the power of the drive unit to the working unit; a tubular portion which is disposed between the drive unit and the working unit, and in which the shaft is inserted; a floating box which has a handle support portion; and a handle which is supported by the handle support portion. The brush cutter is provided with a vibration absorbing member which fits in a tubular portion side fitting portion provided in the tubular portion and fits in a box side fitting portion provided in the floating box.

Abstract: A portable work machine wherein a first region of a shaft facing a handle support part corresponds to the antinode of vibration generated in the shaft. A plurality of bearing members are disposed along the longitudinal direction of the shaft at positions other than the first region in a cylindrical part.

Abstract: A work machine wherein motive power of a drive part is transmitted to an operation part through a shaft, the shaft being inserted into a cylindrical part and supported by a plurality of bearing members. In the cylindrical part, the plurality of bearing members are disposed on the node side of vibration generated in the shaft or the cylindrical part.

Abstract: A muffler for an engine includes: a muffler body provided with a muffling chamber; a discharge pipe configured to discharge exhaust gas that has passed through the muffling chamber to an external space, wherein a downstream edge of the discharge pipe in an exhaust direction is shaped into a wave that is continuous in a circumferential direction.

Abstract: A mower capable of reducing noise generated by rotation of a cutter blade is provided. A mower is provided with an upper cutter blade and a lower cutter blade (15) inside a housing. The lower cutter blade has a wing portion (42) and a wing chamfered portion (51). The wing portion overhangs upward from a second rear end portion (47) of the lower cutter blade on an opposite side in a rotational direction, at both end portions (45) in a longitudinal direction. The wing chamfered portion is chamfered so that a wing outer end portion (53) of the wing portion is inclined from an upper surface to a lower surface.

Abstract: This brush cutter includes: a drive unit; a working unit which is driven by power of the drive unit; a shaft which transmits the power of the drive unit to the working unit; a tubular portion which is disposed between the drive unit and the working unit, and in which the shaft is inserted; a floating box which has a handle support portion; and a handle which is supported by the handle support portion. The brush cutter is provided with a vibration absorbing member which fits in a tubular portion side fitting portion provided in the tubular portion and fits in a box side fitting portion provided in the floating box.

Abstract: A lawn mower includes a cutter blade that is an elongated member extending in opposite horizontal directions with respect to a vertical rotation shaft. The cutter blade includes, on each of its longitudinally opposite end portions, a blade section formed along the front edge, in a rotating direction of the cutter blade, of the end portion, and an air lift section extending from the front edge while curving rearward and upward. The air lift section has a vertical downward wing formed integrally thereon and extending downward via a bent section that is bent downward from at least a rear half portion, in the rotating direction, of an outer peripheral edge of the air lift section. The bent section has a radius set to gradually increase as the air lift section curves rearward and upward in the rotating direction.

Abstract: An outer rotor motor includes a mounting seat portion provided inside a motor case, and a protruding portion protruding from the mounting seat portion. An inner stator has a stator opening portion formed centrally thereof, and a mounting portion is formed adjacent the stator opening portion. A vibration isolating member is interposed between the mounting seat portion and the mounting portion with the stator opening portion telescopically fitting over the protruding portion. The vibration isolating member includes a pair of foam rubber layers and a metal base material sandwiched between the pair of foam rubber layers. A bolt fastens the mounting seat portion and the mounting portion together while compressing the vibration isolating member.

Abstract: A lawn mower includes: a rotation shaft extending vertically in a downwardly-opening housing; and a cutter blade rotatably mounted on the rotation shaft. The cutter blade is an elongated member extending in opposite horizontal directions and having two bent sections formed on respective ones of its longitudinally opposite end portions. The two bent sections are bent in opposite directions as viewed in the axial direction of the rotation shaft. The cutter blade has, on each of the bent sections, a convex cutter blade section formed along a convex edge of the bent section and a concave cutter blade section formed along a concave edge of the bent section. The convex cutter blade section on each of the bent sections has a smaller cutting edge angle than the concave cutter blade section.

Abstract: An outer rotor motor includes a mounting seat portion provided inside a motor case, and a protruding portion protruding from the mounting seat portion. An inner stator has a stator opening portion formed centrally thereof, and a mounting portion is formed adjacent the stator opening portion. A vibration isolating member is interposed between the mounting seat portion and the mounting portion with the stator opening portion telescopically fitting over the protruding portion. The vibration isolating member includes a pair of foam rubber layers and a metal base material sandwiched between the pair of foam rubber layers. A bolt fastens the mounting seat portion and the mounting portion together while compressing the vibration isolating member.

Abstract: A lawn mower includes: a rotation shaft extending vertically in a downwardly-opening housing; and a cutter blade rotatably mounted on the rotation shaft. The cutter blade is an elongated member extending in opposite horizontal directions and having two bent sections formed on respective ones of its longitudinally opposite end portions. The two bent sections are bent in opposite directions as viewed in the axial direction of the rotation shaft. The cutter blade has, on each of the bent sections, a convex cutter blade section formed along a convex edge of the bent section and a concave cutter blade section formed along a concave edge of the bent section. The convex cutter blade section on each of the bent sections has a smaller cutting edge angle than the concave cutter blade section.

Abstract: A lawn mower includes a cutter blade that is an elongated member extending in opposite horizontal directions with respect to a vertical rotation shaft. The cutter blade includes, on each of its longitudinally opposite end portions, a blade section formed along the front edge, in a rotating direction of the cutter blade, of the end portion, and an air lift section extending from the front edge while curving rearward and upward. The air lift section has a vertical downward wing formed integrally thereon and extending downward via a bent section that is bent downward from at least a rear half portion, in the rotating direction, of an outer peripheral edge of the air lift section. The bent section has a radius set to gradually increase as the air lift section curves rearward and upward in the rotating direction.

Abstract: The present invention relates to a combustion chamber in a direct-injection diesel engine. The combustion chamber has a restriction at its inlet and a plurality of recesses in a side surface thereof. Atomized streams of fuel are injected at equal angular intervals from a fuel nozzle having injection ports which are one more than the recesses. The recesses make the piston top surface thinner, and would thermally destruct stepped portions of valve clearances defined in the piston for intake and exhaust valves. To prevent this, the stepped portions of the valve clearances are displaced off the recesses. The side surface of the combustion chamber with which the atomized fuel collides is inclined at an angle of 45.degree. with respect to the piston top surface. With the above construction, good and quiet fuel combustion can be achieved throughout the full range of engine rotation.