| 摘要 |
PURPOSE:To enable a piston ring to be exchanged with a cylinder cover being unreleased by coupling a lower member having a piston ring groove with an upper member without a piston ring groove by bolts to form the piston. CONSTITUTION:A lower member having a ring groove fitting a piston ring 1 is coupled by bolts 3 with an upper member 4 formed with surface contacting combustible gas fire and having no ring groove to form a piston. Thus, the piston ring can be exchanged without releasing a cylinder cover. |
