Four stroke internal combustion engine

Details Four stroke internal combustion engine Four stroke internal combustion engine

1986-01-28

1987-06-09

Feinberg, Craig R.

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

123193CP, 123315, 123432, 92177, F02F 147

Patent

active

046712283

ABSTRACT:
Engines having cylinders of noncircular cross section wherein the cylindrical curve is generated at a preselected constant outwardly normal distance from a closed curve. The closed curve is defined as including two spaced points on a major axis of symmetry of the cylinder with two continuously curved portions extending between these points and curved outwardly from the major axis. The closed curve about which the cylinder curve is generated is preferred such that there is a continuous change of curvature without discontinuity in that curvature in the cylindrical curve. The avoidance of discontinuity in the generating curve aids in mass production consideration and cutter life. A plurality of intake and exhaust port arrangements are disclosed illustrating four intake ports and four exhaust ports on opposite sides of the major axis of symmetry of the defined cylinder. In one embodiment, the outermost of the ports are smaller and are positioned closer to the major axis of symmetry. In another, the valves are oriented such that the stems thereof point to the centerline of the associated camshaft for direct actuation.

REFERENCES:
patent: 4198065 (1980-04-01), Fukui
patent: 4256068 (1981-03-01), Irimajiri et al.
patent: 4266787 (1981-05-01), Fukui
patent: 4306730 (1981-12-01), Honda et al.
patent: 4350126 (1982-09-01), Honda
patent: 4363300 (1982-12-01), Honda
patent: 4383508 (1983-05-01), Irimajiri et al.
patent: 4466400 (1984-08-01), Irimajiri et al.
patent: 4502434 (1985-03-01), Irimajiri et al.

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