Four-stroke internal combustion engine

Patent · Tue Mar 24 04:00:00 EST 1987

OSTI ID:6652621

Yoshikawa, M; Aoi, K

A combination chamber configuration is described for an internal combustion engine comprising: a cylinder with a cylinder bore; a piston having a piston head supported for reciprocation in the cylinder bore; a cylinder head fixed relative to the cylinder and defining a combustion chamber with the piston head and the cylinder bore; poppet type intake valves numbering only three in the cylinder heat communicating with the combustion chamber; and poppet type exhaust valves numbering at least two in the cylinder head communicating with the combustion chamber. Each valve has a head and a stem, the center of the head of the piston being formed to extend upwardly in the cylinder bore no more than an outer peripheral edge of the piston head. The heads of the intake valves all lie substantially on one side of a plane containing the cylinder bore axis and the heads of the exhaust valves lie on the other side of the plane. Two of the intake valves reciprocate about parallel axes that are disposed at a first angle to the one side of the plane and the remaining intake valve is reciprocal about an axis that extends at a second angle to the one side of the plane. The second angle is less than the first angle, and the exhaust valves reciprocate at an angle to the other side of the plane having a degree less than that of the first angle and being inclined to the plane.

• Assignee: Yamaha Hatsudoki Kabushiki Kaisha, Iwata
• Patent Number(s): US 4651696
• OSTI ID: 6652621
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
CYLINDERS
DESIGN
ENGINES
EXHAUST SYSTEMS
HEAT ENGINES
INCIDENCE ANGLE
INCLINATION
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
PISTONS