Abstract: The intake structure for an internal combustion engine includes: a collision surface configured to face an inlet of a carburetor; a deflecting surface configured to deflect a blowback flow, which is to diffuse after colliding against the collision surface, in one direction along the collision surface; a receiving surface configured to receive the blowback flow deflected by the deflecting surface; and a fuel-accumulating surface formed below the collision surface. A first clearance between an air-guiding direction distal end of the deflecting surface and the receiving surface is brought into communication to a downstream side of a filter of an air cleaner in a fresh-air intake direction so as to act as a main intake passage for fresh air.

Abstract: Provided is a backpack working machine with excellent operability and durability, the machine having a configuration in which a blower is mounted on a backpack frame with a vibration isolation device interposed therebetween, and a drive source and a fuel tank are attached to the blower. The machine includes a backpack frame with a backrest portion, the backrest portion being adapted to abut an operator's back, a blower mounted on the backrest portion with a vibration isolation device interposed therebetween, an engine attached to the blower for driving the blower, and a fuel tank that stores a fuel to be supplied to the engine. The fuel tank is attached to the blower such that the fuel tank is located at at least one of a position below the engine or on a lateral side of the engine.

Abstract: An air blower discharges an air flow generated by rotation of a fan from an outlet port of a fan case. An engine and a carburetor are disposed opposing to an outer surface of the fan case. An engine cover (partition) for separating a space in which the engine is disposed from another space in which the carburetor is disposed is provided. The outer surface including a region having a ventilation hole formed through a wall of the fan case, the region opposing to the space in which the carburetor is disposed and the ventilation hole being directed toward the carburetor.

Abstract: A grip for a backpack-type air blowing machine which performs a work by using air discharged from a distal end of an air blowing pipe that is coupled to a blower body driven by a power source while the air blowing pipe is manipulated by an operator with the power source and the blower body being carried on a back of the operator. The grip comprises a base section that constitutes an attachment section to the air blowing pipe, a vertical grip section that is provided with a proximal end portion provided continuously to the base section, and that extends in a direction away from the air blowing pipe, and a lateral grip section that extends backward along the air blowing pipe from a free end of the vertical grip section. The lateral grip section is located adjacent to a back of a hand of the operator holding the air blowing pipe.

Abstract: An air blower discharges an air flow generated by rotation of a fan from an outlet port of a fan case. An engine and a carburetor are disposed opposing to an outer surface of the fan case. An engine cover (partition) for separating a space in which the engine is disposed from another space in which the carburetor is disposed is provided. The outer surface including a region having a ventilation hole formed through a wall of the fan case, the region opposing to the space in which the carburetor is disposed and the ventilation hole being directed toward the carburetor.

Abstract: Provided is a backpack working machine with excellent operability and durability, the machine having a configuration in which a blower is mounted on a backpack frame with a vibration isolation device interposed therebetween, and a drive source and a fuel tank are attached to the blower. The machine includes a backpack frame with a backrest portion, the backrest portion being adapted to abut an operator's back, a blower mounted on the backrest portion with a vibration isolation device interposed therebetween, an engine attached to the blower for driving the blower, and a fuel tank that stores a fuel to be supplied to the engine. The fuel tank is attached to the blower such that the fuel tank is located at at least one of a position below the engine or on a lateral side of the engine.

Abstract: The intake structure for an internal combustion engine includes: a collision surface configured to face an inlet of a carburetor; a deflecting surface configured to deflect a blowback flow, which is to diffuse after colliding against the collision surface, in one direction along the collision surface; a receiving surface configured to receive the blowback flow deflected by the deflecting surface; and a fuel-accumulating surface formed below the collision surface. A first clearance between an air-guiding direction distal end of the deflecting surface and the receiving surface is brought into communication to a downstream side of a filter of an air cleaner in a fresh-air intake direction so as to act as a main intake passage for fresh air.

Abstract: A grip for a backpack-type air blowing machine which performs a work by using air discharged from a distal end of an air blowing pipe that is coupled to a blower body driven by a power source while the air blowing pipe is manipulated by an operator with the power source and the blower body being carried on a back of the operator. The grip comprises a base section that constitutes an attachment section to the air blowing pipe, a vertical grip section that is provided with a proximal end portion provided continuously to the base section, and that extends in a direction away from the air blowing pipe, and a lateral grip section that extends backward along the air blowing pipe from a free end of the vertical grip section. The lateral grip section is located adjacent to a back of a hand of the operator holding the air blowing pipe.

Abstract: A backpack strap includes a strap main body, an upper end of which is connected to a backpack frame, a pad attached to the strap main body on a user side, and a contact state holding unit holding an upper end of the pad in contact with the backpack frame. Upper portions of the strap main body and pad are spaced apart from each other by a specified distance. The upper end of the pad has a shape and a strength that is, when contacting the backpack frame, able to prevent the backpack strap from falling sideways. Due to a tensile force of the upper portion of the strap main body and a stiffness of the upper portion of the pad, the upper portion of the pad is held in a projecting state with the upper end of the pad acting as a support point.