Four cycle internal combustion engine

Patent · Tue Apr 21 04:00:00 EDT 1987

OSTI ID:6635635

Hosoi, Y

An internal combustion engine is described having a cylinder bore having an axis, a cylinder head forming a closure for one end of the cylinder bore, a first poppet-type intake valve reciprocally supported by the cylinder head and having its head portion intersected by the cylinder bore axis when the first intake valve is closed. A second poppet-type intake valve reciprocally supported by the cylinder head has its head portion lying on one side of a plane containing the cylinder bore axis when the second intake valve is closed. Intake passage means form in the cylinder head and controlled by the first and second intake valves for supplying a charge to the cylinder bore, a spark plug carried by the cylinder head and having its gap disposed contiguous to the plane, and intake valves having their stems inclined at an angle to the plane diverging therefrom for providing an open area to clear the spark plug, each of the poppet-type valves further having the ends of their respective valve stems lying within an axial extension of the cylinder bore.

• Assignee: Yamaha Hatsudoki Kabushiki Kaisha, Iwata
• Patent Number(s): US 4658780
• OSTI ID: 6635635
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
CLOSURES
CONTROL EQUIPMENT
CYLINDERS
DESIGN
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
INCIDENCE ANGLE
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
OPERATION
SPARK IGNITION ENGINES
VALVES
VEHICLES