Camshaft driving mechanism of double overhead camshaft engine
AssigneeTsubakimoto Chain Co.
InventorsEisaku Ohmon, Tadasu Suzuki
Life of this patent
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Abstract
A camshaft driving mechanism for driving camshaft wheel members secured to two camshafts in a cylinder head through a power transmitting member mounted between a crankshaft wheel member and the camshaft wheel members; in this driving mechanism, the thickness of the camshaft wheel members is one-half or less of the width of the power transmitting member, one of the camshaft wheel members is offset in an axial direction from the other camshaft wheel member, and the camshaft wheel members partly radially overlap, or one of the camshaft wheel member has a center slit in the axial direction while the other camshaft wheel member fits in the slit.
Claims13
In a camshaft driving mechanism for driving camshaft wheel members respectively secured to two camshafts through a power transmitting member connected between said camshaft wheel members and a crankshaft wheel member, the improvement wherein the thickness of each said camshaft wheel member is one-half or less of the width of said power transmitting member, one of said camshaft wheel members is offset in an axial direction of said camshafts from said other camshaft wheel member, and said camshaft wheel members are partly radially overlapped with one another.
In a camshaft driving mechanism having first and second driven camshaft wheel members respectively supported for rotation about first and second axes which are parallel but transversely spaced apart, a driving crankshaft wheel member supported for rotation about a third axis which is parallel with and transversely spaced from said first and second axes, and an endless flexible power transmitting member engaged with said first and second camshaft wheel members and said crankshaft wheel member for transmitting power from said crankshaft wheel member to said camshaft wheel members, said power transmitting member having a predetermined width, comprising the improvement wherein each of said first and second camshaft wheel members has a peripheral annular engaging region which is maintained in engagement with the power transmitting member, the peripheral engaging region on each of said first and second camshaft wheel members being less than the width of the power transmitting member, the transverse spacing between said first and second axes being less than diameters of perimeters of said first and second camshaft wheel members so that the peripheral annular engaging regions of said first and second camshaft wheel members radially overlap one another, the annular peripheral engaging regions of said first and second camshaft wheel members being offset axially from one another so as to engage different longitudinally extending regions of said endless power transmitting member, said different longitudinally extending regions being offset in the widthwise direction of the power transmitting member.
Dependencies are inferred from the claim text.