| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a piston of an internal combustion engine in a simple structure using a fluid spring for enabling a variation in capacity of a combustion chamber (a variable compression ratio), and to provide an assembling method for the piston.SOLUTION: The piston of the internal combustion engine includes a piston base part 2 having a top wall 4 forming a piston top surface, a peripheral side wall 6 extending from the outer periphery of the top wall in the axial direction of the piston, and a piston skirt 6a, and a piston moving part 3 capable of reciprocating in the center-axis direction of the piston with respect to the piston base part. The piston base part is divided into a top wall portion 2a including the top wall and a skirt portion 2b including the piston skirt, the end of the top wall portion and the end of the skirt portion divided therefrom are formed to be fastened to each other (27a, 27b), and a receiving seat 12 for supporting the piston moving part is formed on the inner face of the peripheral side wall. Thus, the variable-compression-ratio piston is provided in a simple structure, where a sealed space S formed between the piston top part and the piston moving part functions as a fluid spring including air.</p> |
