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US 5,291,868 AGranted
Single overhead cam multi-valve engine
AssigneeYamaha Motor Co., Ltd.
InventorsKenichi Nonogawa, Makoto Shimamoto, Wataru Fuchigami
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AssigneeYamaha Motor Co., Ltd.
InventorsKenichi Nonogawa, Makoto Shimamoto, Wataru Fuchigami
Estimating the term…
Several embodiments of internal combustion engines having at least five valves, three intake and two exhaust, all operated by a single camshaft. The intake valves are disposed so as to provide a smooth combustion chamber configuration by minimizing the difference in angle between the valves and the valves and rocker arms are arranged so that different degree of lift may be provided. All of the intake valves have the same stem length. One rocker arm operates one valve and another rocker arm operates two valves with the two valves being operated being differently configured so as to provide the desired different lift. In addition, a staged intake system is included that has a single intake passage that extends perpendicular to a plane containing the cylinder bore axis and serving one intake valve and a siamese intake passage serving the other intake valves. The siamese intake passage has a section that extends also perpendicularly to the plane.
A cylinder head and valve arrangement for an internal combustion engine comprising a cylinder head assembly adapted to be affixed in sealing relation to an associated cylinder block for closing a cylinder bore therein, a pair of poppet valves supported for reciprocation within said cylinder head assembly about respective reciprocal axes each disposed at a different acute angle to a plane containing the axis of said cylinder bore, a camshaft journaled for rotation about a rotational axis lying contiguous to said plane, the axes of reciprocation of said valves intersecting at a line extending parallel to said plane at a point spaced from the tips of said valves, the stems of said valves having the same length and rocker arm means for operating said valves from said camshaft.
A cylinder head and valve arrangement for an internal combustion engine comprising a cylinder head assembly adapted to be affixed in sealing relation to an associated cylinder block for closing a cylinder bore therein, a pair of poppet valves supported for reciprocation within said cylinder head assembly about respective reciprocal axes each disposed at a different acute angle to a plane containing the axis of said cylinder bore and having the same stem length, a camshaft journaled for rotation about a rotational axis lying contiguous to said plane, the tips of the stems of said valves lying at different distances from the associated cylinder block, and rocker arm means for operating said valves from said camshaft.
A cylinder head and valve arrangement for an internal combustion engine comprising a cylinder head assembly adapted to be affixed in sealing relationship to an associated cylinder block for closing a cylinder bore therein, a pair of poppet valves supported for reciprocation within said cylinder head assembly about respective reciprocal axes each disposed at a different acute angle to a plane containing the axis of said cylinder bore, a camshaft journaled for rotation about a rotational axis lying contiguous to said plane, the tips of the stems of said valves lying a different distances from said plane and rocker arm means for operating said valves from said camshaft, said stems all having the same length.
A cylinder head and valve arrangement for an internal combustion engine comprising a cylinder head assembly adapted to be affixed in sealing relationship to an associated cylinder block for closing a cylinder bore therein, a pair of poppet valves supported for reciprocation within said cylinder head assembly about respective reciprocal axes each disposed at a different acute angle to a plane containing the axis of said cylinder bore, said valves all having the same stem length, a camshaft journaled for rotation about a rotational axis lying contiguous to said plane, and rocker arm means for operating said valves from said camshaft, said rocker arm means being pivotal about an axis extending parallel to said plane, said reciprocal axes of said valves being spaced different perpendicular distances from said rocker arm axis.
Dependencies are inferred from the claim text.