Patent ID: 7665434
Filing Date: 2010-02-23
Classification: F01L

Abstract:
1. An internal combustion engine including: at least one cylinder, at least one air intake valve and at least one exhaust valve for said at least one cylinder, each valve being equipped with a return elastic device, with the function of keeping each valve in a closed position, in order to control the flow of a corresponding manifold, at least one camshaft, to operate said at least one air intake valve and said at least one exhaust valve by acting on at least one of followers and tappets of said at least one air intake valve and said at least one exhaust valve, at least one valve, operated by cams of said at least one camshaft by means of an electronically controlled variable mechanical transmission configured to vary the maximum lift of each valve when changing a working condition of the engine, said electronically controlled variable mechanical transmission interposed between each valve and a corresponding actuating cam of the cams of said at least one camshaft, wherein said variable mechanical transmission, comprises with reference to each actuated valve actuated, by said actuating cam: a regulation mechanism including at least one guiding slotted hole, a primary oscillating lever, directly operated by the corresponding cam, a secondary oscillating lever to transmit the movement to said each actuated valve, a wedge-shaped slider device, with a bore fitted with a roller, free to rotate around an axis of said bore, protruding ends of said roller engaging in said guiding slotted holes; said slider being interposed between the corresponding primary and secondary oscillating levers, to transmit the movement from one to the other, a driving system to operate said regulation mechanism together with its guiding slotted holes, in order to change the position of the slider with respect to said primary and secondary oscillating levers, at the same time varying the characteristic of transmission from said cam to said each actuated valve.