Apparatus and method for controlling the valve operation of an internal combustion engine
AssigneeInvestment Rarities, Incorporated
InventorCorliss O. Burandt
Life of this patent
Estimating the term…
Abstract
A rotatable cam and pivotally mounted rocker arm are employed for each valve of an internal combustion engine. The rocker arm has a working or cam follower surface thereon which includes a straight section and a curved section. By relatively moving the cam and rocker arm so that the cam acts against appropriate portions of the cam follower surface, the moment of valve opening and closing is controlled, as well as the lift and duration of valve opening. The invention makes possible what is herein termed a five-cycle operation in that the following sequence can be achieved: (1) intake, (2) decompression, (3) compression, (4) power, and (5) exhaust.
Claims17
A timing mechanism for internal combustion engines having a camshaft, a timing gear member mounted on said camshaft, a crankshaft and a timing gear member mounted on said crankshaft, and endless belt means entrained about said timing gear members, said mechanism comprising means for directing a portion of said endless belt means in a direction generally perpendicular to a line extending between said camshaft and said crankshaft, said directing means including an additional gear member and said endless belt means being entrained about said timing gear members and said additional gear member, threaded means for shifting said directing means to effect a differential angular movement between said timing gear members, idler means for maintaining said endless belt means taut as said additional gear member is shifted, a pivotal arm, said additional gear member being mounted at one end of said pivotal arm, means mounting the other end of said arm for pivotal movement, means engaging an intermediate portion of said pivotal arm for effecting angular movement of said arm to produce said differential angular movement of said timing gear members, said means for angularly pivoting said arm including a motor, a threaded shaft drive extending from one end of said motor, said arm having a member thereon for threadedly receiving a portion of said threaded shaft so that said threaded shaft when rotated by its motor will cause said arm to be pivotally moved, a rod fixedly connected at one end to the other end of said motor, and a bearing encircling a portion of said camshaft, the other end of said rod being connected to said bearing.
Apparatus for operating a valve of an internal combustion engine having a reciprocable valve member for opening and closing a valve port in communication with a combustion chamber of the engine, the apparatus comprising a rocker arm, means mounting one end of said rocker arm for pivotal movement about a fixed axis so that the other end of said rocker arm acts against said valve member, a camshaft, a cam on said camshaft engageable with said rocker arm, and means for shifting said camshaft relative to said fixed axis so that said cam is engageable with various longitudinal portions of said rocker arm between its said other end and its said one end, said shifting means including bearing means for rotatably supporting said camshaft and means threadedly engaging said bearing means for moving said bearing means to effect said shifting of said camshaft relative to said axis.
Dependencies are inferred from the claim text.