Opposed-piston engine

An opposed-piston engine comprising:

• a cylinder
• a first piston and a second piston which are arranged in the cylinder and reciprocate in opposite directions to each other while a top surface of the first piston and a top surface of the second piston face each other,
• a combustion chamber formed between the top surface of the first piston and the top surface of the second piston at a center part of the cylinder in an axial direction,
• a crankshaft arranged so that an axis of the cylinder and a rotational axis of the crankshaft become parallel to each other separated by a distance, the crankshaft having a first crankpin and a second crankpin which are formed at two sides of a plane which is vertical to the rotational axis of the crankshaft and includes the center part of the cylinder in the axial direction, the axes of the first crankpin and the second crankpin being slanted with respect to the rotational axis of the crankshaft in mutually opposite directions,
• a first rocker member rotatably mounted on the first crankpin and having an arm extending toward outside of the first crankpin in a radial direction, and
• a second rocker member rotatably mounted on the second crankpin and having an arm extending toward outside of the second crankpin in a radial direction, a tip end part of the arm of the first rocker member being connected to an end part of a connecting rod attached to a back surface of the first piston, a tip end part of the arm of the second rocker member being connected to an end part of a connecting rod attached to a back surface of the second piston, wherein the first rocker member and the second rocker member engage in swinging motions about the first crankpin and the second crankpin without rotating about the first crankpin and the second crankpin respectively when the first piston and the second piston reciprocate, whereby the crankshaft is made to rotate.