Cam drive gear and valve operating system drive gear for engine
AssigneeHonda Motor Co., Ltd.
InventorsToru Oshita, Toru Kisaichi, Shingo Nakayama, Atsushi Sawa, Ryushi Tsubota
Life of this patent
Estimating the term…
Abstract
A cam drive gear for an engine is described where the distance between the axes of a crankshaft and an idle shaft bearing an idle gear thereon can be made smaller, thereby contributing to a reduction in the size of the engine. In addition, a valve-operating system drive gear for an engine is also described where it is possible to restrain a cam chain from chattering at its portion wrapped around a drive sprocket.
Claims16
A cam drive gear for an engine, comprising an idle gear rotatably borne on an idle shaft supported on an engine main body so as to permit power to be transmitted from a crankshaft, drive sprockets rotatable together with said idle gear, driven sprockets provided on camshafts, and endless form power transmission members wrapped around said drive sprockets and said driven sprockets;
- a primary drive gear mounted on the crankshaft for transmitting the power of the engine to a transmission, and an idler drive gear having a diameter smaller than a diameter of said primary drive gear and disposed to an outer side of said primary drive gear in the axial direction, said idle gear is meshed with said idler drive gear and said idle shaft has an axis parallel to said crankshaft, and said drive sprockets have at least parts of outer peripheries thereof opposed to said primary drive gear and said drive sprockets are disposed to an inner side of said idle gear in the axial direction and said drive sprockets are coaxial with and adjacent to said idle gear.
A valve-operating system drive gear for an engine, comprising a driven sprocket provided on a camshaft that is rotatably borne on a cylinder head, a drive sprocket operated in conjunction with the rotation of a crankshaft, an endless form cam chain wrapped around said drive sprocket and said driven sprocket, and a chain guide member making sliding contact with the outer periphery of said cam chain, wherein an end portion of said chain guide member adjacent said drive sprocket is so formed as to cover at least a portion of the outer periphery of said drive sprocket around which said cam chain is wrapped.
A valve-operating system drive gear for an engine, comprising first and second power transmission means each comprising a driven sprocket provided on a camshaft that is rotatably borne on a cylinder head, a drive sprocket operated in conjunction with the rotation of a crankshaft, an endless form cam chain wrapped around said drive sprocket and said driven sprocket, and a chain guide member making sliding contact with the outer periphery of said cam chain;
- the first and second power transmission means are disposed respectively in first and second banks arranged in a V shape, said drive sprockets in both said banks being arranged coaxially, wherein in said power transmission means on at least one side of said first and second banks, an end portion of said chain guide member adjacent said drive sprocket is so formed as to cover at least a portion of the outer periphery of said drive sprocket around which said cam chain is wrapped.
Dependencies are inferred from the claim text.