Variable valve timing arrangement for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMinoru Yonezawa
Life of this patent
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Abstract
An improved variable valve timing mechanism for an internal combustion engine wherein the variable valve timing mechanism includes a control valve mounted by a bearing cap for the cam shaft and specifically one end of the cam shaft. The bearing cap is fastened to the cylinder head by threaded fasteners that are disposed on opposite sides of a bearing surfaces a cam shaft in which at least one oil control groove is formed. Oil is supplied to this control groove by a valve element that is mounted in the bearing cap in spaced relation to the threaded fasteners.
Claims7
A variable valve timing mechanism for an internal combustion engine having a cam shaft having a bearing portion at one end thereof for journaling in an engine body at least in part by a bearing cap fixed to said engine body by threaded fasteners disposed on opposite sides of said cam shaft bearing portion, a variable valve timing mechanism associated with said one end of said cam shaft for driving said cam shaft from an engine crankshaft and for varying the phase angle between said cam shaft and the engine crankshaft, said bearing portion being formed with at least one circumferential groove for receiving hydraulic fluid for actuating said variable valve timing mechanism, and a valve element mounted by said bearing cap for controlling the flow of fluid therethrough to said groove, said valve element being spaced relative to said threaded fasteners in the direction of the axis of said cam shaft.
Dependencies are inferred from the claim text.