Abstract: A suction tube of a stratified scavenging engine that can improve the flexibility in designing the shapes and layouts of an air-fuel mixture passage and an air passage; allow for continuous and smooth changes in the shapes of the cross sections of the air-fuel mixture passage and the air passage from the inlet side toward the outlet side; reduce the number of components; and facilitate attachment and assembly; and that is also advantageous in terms of cost is provided. The suction tube includes an air-fuel mixture passage and an air passage, inlet and outlet sides of the passages being connected to a carburetor and a cylinder, respectively; a cylindrical exterior member that mainly forms an outer perimeter portion of each of the air-fuel mixture passage and the air passage; and an interior member for dividing the inside of the cylindrical exterior member into the air-fuel mixture passage and the air passage.

Abstract: A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage.

Abstract: A mounting device can mount an intake manifold to an engine and includes a bending moment applying device applying a bending moment to the intake manifold as the intake manifold is mounted to the engine.

Abstract: An air supply device (2) used in a two-stroke engine includes: an insulator (14) having an insulator mixture passage (17) that is in communication with an intake port (5A) provided in an engine body (1) of the two-stroke engine, the insulator being attached to the engine body (1); a carburetor (15) having an insulator mixture passage (17) that is in communication with an insulator mixture passage (17), the carburetor (15) being attached to the insulator (14); an air cleaner (16) having a mixture-side opening (25) that is in communication with the carburetor mixture passage (19), the air cleaner (16) being attached to the carburetor (15); an accumulating portion (29) that accumulates a blow-back fuel returned through the mixture-side opening 25, the accumulating portion (29) being provided inside the air cleaner (16); and an auxiliary passage having a base end connected to the accumulating portion (29) and a distal end connected to a portion affected by a pressure fluctuation inside a crankcase chamber provide

Abstract: An intake system for a V-type multiple cylinder internal combustion engine includes a plurality of parallel first intake pipes 15L connected to the plurality of cylinders of a first cylinder row, a plurality of parallel second intake pipes 15R connected to the plurality of cylinders of a second cylinder row. The first intake pipes 15L and the second intake pipes 15R extend into an air distribution case 10 so as to extend across each other. A first inlet pipe 13R is provided at a part of a first side wall 11R of the air distribution case 10 corresponding to a substantially middle point of the row of the first intake pipes 15L, and a second inlet pipe 13L is provided at a part of a second side wall 11L of the air distribution case 10 corresponding to a substantially middle point of the row of the second intake pipes 15R. Air flows through the first inlet pipe 13R into the first intake pipes 15L and air flows through the second inlet pipe 13L into the second intake pipes 15R.

Abstract: Screw holes are provided on a contacting surface of an insulator so as to enable a carburetor to be mounted on the insulator at a plurality of positions rotated about an axial center of an intake hole. The insulator is mounted on a cylinder at a predetermined position while the carburetor is mounted on the insulator by inserting bolts for mounting the carburetor into the screw holes through through holes of the carburetor. Accordingly, the carburetor can be mounted at a plurality of positions rotated about the axial center of intake holes relative to an engine body. Thus, a protruding direction of a throttle lever from the carburetor, i.e., an operating direction of the throttle lever, can be changed.

Abstract: Through holes formed on an atomization pipe can prevent fuel adhering on inner walls of the through holes from escaping. In addition, when fuel adhering on an inner circumferential surface of the atomization pipe flows toward a downstream side, the fuel enters the through holes. Thus, the fuel can be confined therein. Furthermore, an absorbing member can absorb the fuel that has adhered to a downstream inner wall of the atomization pipe and flows toward the downstream side. Moreover, a periphery of the intake passage hole of a gasket protrudes from the inner wall, so that flow of the fuel that the absorbing member fails to absorb toward the downstream side can be blocked. Accordingly, a rapid increase in the amount of fuel flowing into the engine body can be reliably prevented. Therefore, fluctuation in the number of revolutions of the engine can be sufficiently restrained.

Abstract: An air induction housing having a perforated wall which simultaneously provides ample air entry into the air induction housing and excellent intake noise attenuation. The size, number and arrangement of the perforations is selected such that ample airflow is provided and audibility of intake noise is minimized, based upon simultaneous optimization of: providing a plurality of perforations which collectively have an opening size that accommodates all anticipated airflow requirements; sizing each of the perforations such that the airflow demand involves an airflow speed through each perforation that is below a predetermined threshold at which perforation airflow noise is generated; and arranging the perforation distribution in cooperation with configuring of the air induction housing to provide a highest level of intake noise attenuation.

Abstract: The present invention provides an intake system for supplying intake air to a multiple cylinder internal combustion engine. The intake system includes an air intake having a suction pipe with a frame therein and a plurality of wings attached to the frame wherein the wings generate a swirl state in the intake air. The system further includes an air cleaner, an intake pipe, an intake manifold having a surge tank, a plurality of first suction chambers and a plurality of first suction balancers. The system also includes a second suction chamber and a second suction balancer. The second suction balancer is configured to accommodate intake air that flows reversely through the second suction chamber and the second suction chamber is configured to mix the intake air from the air intake and the intake air from the second suction balancer and dispense mixed air to an intake port of the engine. The system provides for sufficient air intake at a vast range of engine speeds and loads.

Abstract: An internal combustion engine having an intake channel for supply of fuel and combustion air, and divided over a portion of its length into a mixture channel, and into a supply channel for supply of largely fuel-free air. A simple manufacture of the engine and a simple construction are achieved if a portion of the intake channel is guided in an elastic intake adapter, whereby the intake adapter has a partition that extends over at least a portion of the length of the intake adapter and divides the intake channel into a mixture channel and a supply channel.

Abstract: An air intake duct for a vehicle having a cuttable groove at an external wall of an air exhaust port can be applied to any vehicle regardless of whether an air filter is adopted, thus providing cost-effectiveness, preventing air leakage when the air filter is not used, and increasing the air-conditioner/heater function of the vehicle.

Abstract: An intake system has a tubular intake manifold, having an end connected to an intake port of an engine and an opposite end connected to a throttle body that includes a throttle valve. The intake system also has a bypass passage, connected to the intake manifold downstream of the throttle valve, and an air flow meter disposed in the bypass passage for detecting an amount of intake air drawn into the engine. A portion of the intake air that flows through the intake manifold is divided and flows into the bypass passage, wherein the amount of intake air flowing through the bypass passage is detected by the air flow meter.

Abstract: An elastic connecting piece (1) is mounted between a carburetor (4) and an inlet channel (3) of an internal combustion engine (2). The engine (2) is especially an engine of a portable handheld motor-driven work apparatus such as a motor-driven chain saw, cutoff machine or the like. The connecting piece (1) includes a peripherally extending expansion fold (5) arranged between its ends in order to compensate for changes in length. The expansion fold (5) subdivides the connecting piece (1) into a carburetor-end section (6) and into an engine-end section (7). The annular gap (28) of the expansion fold (5) can be bridged by a seal lip (8). The connecting piece (1) includes a peripherally extending seal seat (9) of axial length (g) in the region of the expansion fold (5). The seal lip (8) can be placed in seal-tight contact with the seal seat (9) and substantially closes the expansion fold (5) fluid tight to the interior space of the connecting piece (1).

Abstract: An internal combustion engine including a cylinder, a crankshaft, a reciprocating piston disposed in the cylinder and operably coupled to the crankshaft, and a carburetor.

Abstract: An internal combustion engine including a cylinder, a crankshaft, a reciprocating piston disposed in the cylinder and operably coupled to said crankshaft, and a carburetor.

Abstract: An internal combustion engine including a cylinder, a crankshaft, a reciprocating piston disposed in the cylinder and operably coupled to said crankshaft, and a carburetor.

Abstract: The invention relates to a two-stroke engine for a portable handheld work apparatus such as a motor chain saw. The combustion chamber (3), which is configured in a cylinder (2), is delimited by a piston (5) which drives a crankshaft (7) rotatably journalled in a crankcase (4). The crankcase (4) is connected to the combustion chamber (3) via a transfer channel (14). A first end (20) of the transfer channel (14) opens into the combustion chamber (3) via an entry window (12, 15) lying in the cylinder wall (16); whereas, the second end (19) of this transfer channel (14) is open toward the crankcase (4). The transfer channel (14) is connected between its ends (19, 20) to an air channel (22a, 22b) via a check valve (21). The air channel (22a, 22b) supplies essentially fuel-free gas via a throttle (31) having an adjustable throttle element (33). A mixture-preparation device (8) is provided for the air/fuel mixture downstream of an air filter (42) in the flow direction of the combustion air.

Abstract: A connecting device (1) for a fuel supply unit (2), such as a carburetor, to a cylinder (3) of an internal combustion engine, said connecting device is mainly composed of a flexible inlet bellow (4) with an inlet duct (5). The bellow (4) has at its one end a first flange part (6), which surrounds the inlet duct and furthest out has a projecting outer edge (7) intended to be pushed upon a projecting inlet stud (8) of the cylinder, and the inlet bellow is at its other end mounted to the fuel supply unit (2). The inlet stud (8) has besides an inlet opening (13) at least one cavity (14) by the side of the inlet opening and the inlet bellow is arranged with at least one from the first flange part (6) projecting nose part (15) intended to protrude into the cavity (14) when the inlet bellow in an axial direction is being pushed upon the inlet stud (8).

Abstract: A drive unit (1) for a handheld working tool, such as a chain saw, trimmer or hedge trimmer, essentially comprising a housing part (2) with a fuel tank (3) and an engine unit (4) with a fuel supply unit (5) such as a carburetor (5), a muffler (6), and a crankcase scavenged combustion engine (7) with a cylinder (8), piston (15) and crankshaft. The engine (7) has at least one inlet port (9) located in the cylinder wall (10) of the engine and/or an adjacent part of the engine crankcase (11), and the engine's inlet duct (13) from the inlet port (9) up to the fuel supply unit (5) has a length longer than 1.8 times the engine cylinder stroke (18), preferably longer than 2.0 times the cylinder stroke (18).