Cylinder liner and reciprocating engine comprising cylinder liner

A cylinder liner provided in a reciprocating engine, the cylinder liner being a cylinder liner:

• which is provided in, out of an inner face of a cylinder in the reciprocating engine, only a partial region over which a piston ring fits onto a piston that performs reciprocal motion in the cylinder slides, except for a region near a top ring at a bottom dead center of the piston in the cylinder;
• and
• in which a cylinder liner entire length along an axial direction of the cylinder is smaller than an inner diameter of the cylinder,
• wherein the cylinder liner is assembled to the cylinder by inserting the cylinder liner only from an opening portion on a compression chamber side of the cylinder,
• wherein the cylinder liner includes a structure where recessed and protruding forms, which change in axial-direction length, are formed on one end portion that is an end portion toward a bottom dead center side of the piston ring in the axial direction, and
• wherein the cylinder liner is formed in a tapered form in which an inner diameter of the cylinder liner gradually increases and expands in diameter from the recessed and protruding forms toward the bottom dead center side of the piston ring.