Engine cylinder block

An engine cylinder block, comprising a cylinder block housing and a double-crankshaft mechanism installation case located at a downside of the cylinder block housing;

• wherein the cylinder block housing is integrally connected with the double-crankshaft mechanism installation case to form an entirety;
• a cylinder block cavity hermetically contacted with a piston head to form a combustor is provided in the cylinder block housing;
• the double-crankshaft mechanism installation case is enclosed and formed by an end cover and a side cover, and has a lower opening;
• a piston rod guiding groove matched with a guiding rod of a piston is provided below a position inside the double-crankshaft mechanism installation case, and the position corresponds to a position of the cylinder block cavity;
• the piston rod guiding groove is provided with a connecting rod sliding groove for an up-down motion of the connecting rod;
• two sides of the piston rod guiding groove are respectively provided with a crank operation cavity for the circular rotation of a crank of a crankshaft around a main spindle;
• the double-crankshaft mechanism installation case (2) is provided with a main spindle installation hole for the main spindle at two ends of each crank operation cavity;
• a main spindle support is configured below the main spindle installation hole;
• a central output gear mandrel is installed on one end of the double-crankshaft mechanism installation case;
• and an installation position of the central output gear mandrel is required at a position where the central output gear simultaneously engages with drive gears on the ends of double-crankshaft.