A double crankshaft reciprocating engine, comprising:
- a plurality of cylinder assemblies, each cylinder assembly comprising:
- a cylinder, which is provided with cylinder air inlets and an intake valve at the top;
- a piston, which is mounted in the cylinder, the piston and an inner wall of the cylinder located above the piston form a combustion chamber;
- the piston is provided with first vent holes and a first exhaust valve for controlling the on-off of the first vent holes;
- and
- a displacer, which is mounted in the cylinder and located below the piston, a cylindrical space between the displacer and the piston is a compression chamber;
- the displacer is provided with second vent holes and a second exhaust valve for controlling the on-off of the second vent holes;
- and
- a double crankshaft transmission system, comprising:
- two crankshafts provided in parallel, each crankshaft comprises a plurality of cranks, a plurality of the corresponding cranks of the two crankshafts constitute a plurality of crank pairs, and each of the crank pairs is mirror symmetric with respect to a YZ plane;
- a pair of transmission gears which are mounted on the front ends of the two crankshafts and mesh with each other;
- wherein a midpoint of a connecting line of centers of the pair of transmission gears is defined as the origin O of an XYZ coordinate system, the connecting line of centers is defined as an X-axis direction, a direction parallel to the axis of the transmission gears is defined as a Y-axis direction, and a vertical direction is defined as a Z-axis direction,
- a plurality of displacer rods, each displacer rod is a hollow rod that extends in the Z-axis direction and is connected to the displacer at a top end and extends out of a bottom end of the cylinder at a bottom end;
- a plurality of piston rods, each piston rod extends in the Z-axis direction and has a top end connected to the piston and a bottom end passing through the displacer and the displacer rod and extends beyond the bottom end of the displacer rod;
- a plurality pairs of push rods, upper ends of each pair of the push rods are rotatably connected to the bottom end of the displacer rod respectively;
- and
- a plurality of pairs of connecting rods, lower ends of each pair of the connecting rods are rotatably connected to the bottom ends of the piston rods respectively, and the lower ends of each pair of the push rods and the upper ends of each pair of the connecting rods are rotatably connected to the same crank pair respectively, so that each pair of the connecting rods and each pair of the push rods form a rhombic structure.