Abstract: It is an object of the present invention to provide an engine which can easily be produced. In an engine including an electronic throttle device, a control unit for controlling the electronic throttle device, and a gas fuel supply unit, a gaseous-fuel mixer is used as the gas fuel supply unit, and when an extending direction of a crankshaft is defined as a longitudinal direction and an engine cooling fan is defined as existing on a front side and a side opposite from the front side is defined as a rear side, a collector of an intake manifold extends in the longitudinal direction, the electronic throttle device is mounted on the rear side of the collector, and the gaseous-fuel mixer is mounted on the rear side of the electronic throttle device.

Abstract: A spark ignition engine capable of fixing an ignition coil case even in a small engine includes an intake manifold 9 attached to a cylinder head 1, a coil case attachment stay 10 attached to the intake manifold 9, a cylinder portion through hole 12 formed on a board 11 of the coil case attachment stay 10, and a coil case attaching portion 13 provided in an upper part of the board 11. A flexible cylinder portion is caused to penetrate through a cylinder portion through hole, a tongue piece 15 is caused to protrude from a coil case peripheral wall 14 of an ignition coil case 7. The tongue piece 15 is mounted on the coil case attaching portion 13 and the coil case peripheral wall 14 is caused to abut on an edge portion 16 of the coil case attaching portion 13.

Abstract: It is an object of the present invention to provide an engine which can easily be produced. In an engine including an electronic throttle device, a control unit for controlling the electronic throttle device, and a gas fuel supply unit, a gaseous-fuel mixer is used as the gas fuel supply unit, and when an extending direction of a crankshaft is defined as a longitudinal direction and an engine cooling fan is defined as existing on a front side and a side opposite from the front side is defined as a rear side, a collector of an intake manifold extends in the longitudinal direction, the electronic throttle device is mounted on the rear side of the collector, and the gaseous-fuel mixer is mounted on the rear side of the electronic throttle device.

Abstract: A spark ignition engine capable of fixing an ignition coil case even in a small engine includes an intake manifold 9 attached to a cylinder head 1, a coil case attachment stay 10 attached to the intake manifold 9, a cylinder portion through hole 12 formed on a board 11 of the coil case attachment stay 10, and a coil case attaching portion 13 provided in an upper part of the board 11. A flexible cylinder portion is caused to penetrate through a cylinder portion through hole, a tongue piece 15 is caused to protrude from a coil case peripheral wall 14 of an ignition coil case 7. The tongue piece 15 is mounted on the coil case attaching portion 13 and the coil case peripheral wall 14 is caused to abut on an edge portion 16 of the coil case attaching portion 13.

Abstract: A vaporized-fuel processing device for an engine stabilizes the idling operation wherein vaporized fuel within a fuel reservoir is adsorbed to an adsorbing member of a canister. While the engine is in operation, air is sucked from an air inlet into the canister with the intake-air negative pressure produced in an intake-air passage. This air separates the vaporized fuel adsorbed to the adsorbing member of the canister. Purge gas resulting from mixing the vaporized fuel into the air is sucked from a purge-gas sucking port into the intake-air passage. A throttle valve is arranged in a throttle intake-air passage of a throttle body. An intake-air pipe is disposed intake-upstream of the throttle body and is communicated with the throttle intake-air passage. The intake-air pipe has a peripheral wall to which a purge-gas sucking pipe is detachably attached. The purge-gas sucking port is provided within the purge-gas sucking pipe.

Abstract: The present invention has an object to provide a vaporized-fuel processing device for an engine, capable of stabilizing the idling operation. In order to accomplish the above object, the vaporized fuel (9) within a fuel reservoir (5) is adsorbed to an adsorbing member of a canister (1). While the engine is in operation, the air (10) is sucked from an air inlet (3) into the canister (1) with the intake-air negative pressure produced in an intake-air passage (7). This air (10) separates the vaporized fuel (9) adsorbed to the adsorbing member of the canister (1). Purge gas resulting from mixing the vaporized fuel (9) into the air (10) is sucked from a purge-gas sucking port (8) into the intake-air passage (7). A throttle valve (14) is arranged in a throttle intake-air passage (13) of a throttle body (12). An intake-air pipe (15) is disposed intake-upstream of the throttle body (12) and is communicated with the throttle intake-air passage (13).

Abstract: The present invention concerns a multi-cylinder engine comprising a throttle body (5) in which a throttle intake-air passage (6) is provided. A throttle valve (7) is arranged in this throttle intake-air passage (6). Attached to the throttle body (5) is an injector (8), a leading end portion (9) of which is arranged opposite to an interior area of the throttle intake-air passage (6) downstream of the throttle valve (7) and is opened to provided a liquid-fuel injection hole (10). An intake-air pressure sensor (15) is attached to the throttle body (5) together with the injector (8) and an intake-air pressure introduction passage (18) has an inlet (18a) provided by opening an inner peripheral surface of the throttle intake-air passage (6) upstream of the injector (8).

Abstract: The present invention concerns a multi-cylinder engine comprising a throttle body (5) in which a throttle intake-air passage (6) is provided. A throttle valve (7) is arranged in this throttle intake-air passage (6). Attached to the throttle body (5) is an injector (8), a leading end portion (9) of which is arranged opposite to an interior area of the throttle intake-air passage (6) downstream of the throttle valve (7) and is opened to provided a liquid-fuel injection hole (10). An intake-air pressure sensor (15) is attached to the throttle body (5) together with the injector (8) and an intake-air pressure introduction passage (18) has an inlet (18a) provided by opening an inner peripheral surface of the throttle intake-air passage (6) upstream of the injector (8).