Automatic compression adjusting mechanism for internal combustion engines.

摘要

Means for controlling the compression pressure in an internal combustion engine having one or more cylinders and subject to widely varying power output requirements. Received between each crank pin (C) and connecting rod (D) is an eccentric sleeve (E) selectively capable of rotation about the crank pin and/or inside the rod and for latching with the rod to vary the effective length of the connecting rod and thereby the clearance volume of the engine. The eccentric sleeve normally rotates inside the connecting rod during the exhaust and intake strokes, but a latching pawl (F) carried by the eccentric is movable radially outwardly to latch the rod and eccentric together. A control valve (J) responds to intake manifold pressure to time the supply of hydraulic fluid to move the latching pawl outwardly, thus varying the rod length to maintain a substantially optimum firing chamber pressure at all intake manifold pressures.