| 摘要 |
<p>A reciprocating engine has at least a cylinder (10) having a combustion chamber (16) at an upper portion thereof. A piston (12) reciprocates inside the cylinder (10) as a fuel gas is burnt in the combustion chamber (16). A rotatable cylindrical shaft member (1) extends in an axial direction of the cylinder (10). At least a top end portion of the cylindrical shaft member (1) is fittable within an inner bore of the piston (12). One or more of projections (4,5) are formed integrally with the piston (12) and projects toward the inner bore. One or more of endless spiral grooves (2,3) are formed at a periphery of the cylindrical shaft member (1) and adapted to engage the projections respectively. Reciprocation of the piston (12) is transformed into rotation of the cylindrical shaft member (1) through engagement between the projections (4,5) and the endless spiral grooves (2,3). <IMAGE></p> |
