Camshaft bearing arrangement
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKazuo Aoi, Toshikazu Ozawa
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Abstract
An internal combustion engine of the multiple valve type embodying an improved supporting arrangement for a camshaft that directly operates one valve and indirectly operates a pair of valves. The camshaft is provided with bearing surfaces on opposite sides of the cam lobes and a pair of bearing caps cooperate with the cylinder head for supporting these bearing surfaces. Each bearing cap and the cylinder head journal one of the bearing surfaces of the camshaft around its circumference and the other of the camshaft bearing surfaces are journaled only by the bearing cap and not by the cylinder head so as to afford clearance and yet adequate support.
Claims10
A bearing arrangement for the camshaft of an internal combustion engine or the like which camshaft is formed along its length in axial order with a first bearing surface, a first cam lobe, a second bearing surface, a second cam lobe, a third bearing surface, a third cam lobe and a fourth bearing surface, the improvement comprising first bearing means extending around substantially the full circumference of said first bearing surface and journaling said first bearing surface, second bearing means extending around substantially less than the circumference of said second bearing surface and journaling said second bearing surface, third bearing means extending around substantially less than the circumference of said third bearing surface and journaling said third bearing surface, and fourth bearing means extending around substantially the full circumference of said fourth bearing surface and journalling said first bearing surface.
A bearing arrangement for a camshaft having a cam lobe and bearing surfaces on opposite sides of said cam lobe comprising a bearing cap having axially spaced first and second bearing surfaces cooperating respectively with the camshaft bearing surfaces, first bolting means formed by said bearing cap on opposite sides of said first bearing surface for passing a pair of fastening means adapted to affix said bearing cap to an associated component of the engine, and second bolting means formed on only one side of said second bearing surface of said bearing cap for passing a single fastening means for affixing said bearing cap to the associated engine component.
Dependencies are inferred from the claim text.