Patent ID: 8166929

Claim:
A variable compression ratio internal combustion engine comprising at least: a base section ( 1 ), said base section ( 1 ) comprising a crankcase ( 2 ), said crankcase ( 2 ) comprising bearings ( 3 ), said base section ( 1 ) comprising a crankshaft ( 4 ) rotatably mounted on said crankcase ( 2 ) by means of said bearings ( 3 ) to rotate therein, said crankcase ( 2 ) comprising crankcase sliders ( 5 ), said crankcase ( 2 ) comprising crankcase projections ( 6 ); a movable section ( 7 ), said movable section ( 7 ) comprising a cylinder ( 8 ), said movable section ( 7 ) comprising a cylinder head ( 9 ), said movable section ( 7 ) comprising cylinder sliders ( 10 ), said movable section ( 7 ) being slidably fitted on said crankcase ( 2 ) by means of said crankcase sliders ( 5 ) and said cylinder sliders ( 10 ), said cylinder sliders ( 10 ) supported on said crankcase sliders ( 5 ) pass the thrust loads of said cylinder ( 8 ) to said crankcase ( 2 ); a working piston ( 11 ) slidably fitted into said cylinder ( 8 ); a combustion chamber ( 12 ) formed between said cylinder ( 8 ), said working piston ( 11 ) and said cylinder head ( 9 ); a control shaft ( 13 ), said control shaft ( 13 ) being pivotally mounted into said cylinder head ( 9 ), said control shaft ( 13 ) comprising eccentric pins ( 14 ); connecting rods ( 15 ), said connecting rods ( 15 ) being pivotally mounted, at one end, on said eccentric pins ( 14 ), said connecting rods ( 15 ) being, at their other ends, pivotally mounted on said crankcase projections ( 6 ), the control shaft ( 13 ), supported on said crankcase projections ( 6 ), is bearing the cylinder head ( 9 ) and the forces from the combustion, the angular displacement of the control shaft ( 13 ) varies the compression ratio by displacing the cylinder head ( 9 ) relative to the crankcase ( 2 ) via the connecting rods ( 15 ).