| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston structure with a bush that comprises a small number of components and has excellent assemblability while maintaining airtightness.SOLUTION: A piston 2 is a bottomed cylindrical body which has a large-diameter head part 2a and a small-diameter skirt part 2b and also has a step part 2d formed, and reciprocates in a cylinder 1. The piston has an endless annular main bush 21 fitted loosely to a head part of the piston and also has a cylindrical guide bush 22 with a slit fitted to the skirt part by being radially spread. The piston has a flange part 2c formed at a head peak end so as to hold the main bush between the flange part and the guide bush, and also has an annular projection 2e formed at an opening end of the skirt part while extending radially outward so as to hold the guide bush between the annular projection and the step part. |
