| 摘要 |
According to the present invention, a recess (25) which is induction means is provided in a top end surface (24) of a piston (16), the recess (25) guides working fluid (3) staying near an inner peripheral surface of a compression chamber (13) from an outer peripheral edge of the top end surface (24) toward an opposite position of the top end surface (24) facing a discharge hole (19), and the recess (25) smoothens discharging motion of working fluid (3) from the discharge hole (19). |
