摘要:
An internal combustion engine includes an intake passage structure. The engine is configured such that a cylinder head is formed integrally with an intake manifold portion. A cylinder central axis is oriented parallel to an extending direction of an intake passage, when viewed in a side view. An injector is arranged such that it does not interfere with peripheral components, including the intake passage and a throttle body. The injector is disposed in the intake manifold portion such that a leading end thereof is oriented towards the intake valve of the cylinder head. The intake passage on the upstream side of an injector attachment position is offset from the injector in a width-direction of the internal combustion engine.
摘要:
A motorcycle includes an engine configured to expel an exhaust from combustion chambers of cylinders in a cylinder head through exhaust ports. Each of the cylinders is provided with a recessed portion provided in an exhaust passage wall surface in a central portion of an exhaust passage of a corresponding exhaust port. This makes it possible to maintain flow rate and flow velocity of the exhaust gas, and to decrease exhaust loss. As a result, it is possible to increase engine torque by use of a simple structure. In addition, no restriction is imposed on the layout of parts around the engine, because the recessed portions are provided in the exhaust ports.
摘要:
An internal combustion engine includes an oil storage structure defining an oil storage chamber provided for storing oil therein. The engine is configured such that a crankcase cover, covering a clutch mechanism, is joined to a crankcase for forming an oil storage chamber. The oil storage structure is applied to an engine having a vertically split crankcase, and is configured to prevent the clutch mechanism from dipping into stored oil so that clutch disengagement performance is not affected, and reliability of the liquid-tight sealing performance is extended. The crankcase cover is formed with a partition wall extending along the outer circumference of the clutch mechanism. The partition wall splits a space between the crankcase and the crankcase cover into two chambers. Of these chambers, a chamber separate from a clutch mechanism is used as the oil storage chamber, which is formed only by a lower crankcase and the crankcase cover.
摘要:
An engine for a vehicle can include an oil pan coupled to a lower portion of a crankcase, and a partition wall configured to partition a crank chamber in the crankcase and the oil pan. The partition wall can be disposed on the crankcase, and can include openings configured to return oil from a crank chamber side to an oil pan side. Bridges are configured to suppress back flow of the oil from the oil pan side to the crank chamber side. The bridges can be fixedly disposed below the openings so as to cover at least part of the openings from below.