Variable valve timing
OwnerJohn B. Phoenix, Lancelot Phoenixinventors
Life of this patent
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Abstract
A means of varying both the opening and closing angle of internal combustion engine cam-operated valves by means of a mechanism which responds to the torque applied to the camshaft by the valve springs in such a way that the opening angle of the valves is retarded and the closing angle advanced and in which a means of inhibiting this operation can be incorporated.
Claims18
An internal combustion engine valve timing system in which at least one camshaft is driven by means of a mechanism including a differential gear system which an permit a limited change in a phase relationship between an engine crankshaft and the at least one camshaft and in which the phase change takes the form of an angular displacement which is compliantly constrained about some nominal angle in such a way that a torque reaction from the camshaft operating valves results in a change in instantaneous phase displacement in some desired manner.
A valve timing system in an internal combustion engine, said engine having a crankshaft, at least one camshaft and valves associated with said at least one camshaft, said valve timing system comprising a differential gear system means, driven by said crankshaft, for compliantly driving said at least one camshaft in a phase relationship with said crankshaft, said differential gear system means including compliant means, responsive to torque variations from said camshaft, for providing a limited angular phase change from a nominal phase relationship between said crankshaft and said at least one camshaft.
Dependencies are inferred from the claim text.