| 摘要 |
A cushioning mechanism (6) that reduces the speed of a piston rod (30) when the piston rod (30) is near the end of the stroke, comprises: a holder (61) fastened to the end surface of a cylindrical section (42) that engages with the inner peripheral surface of a cylinder tube (10); an annular entry section (62) provided in the piston rod (30), that enters the holder (61) and the cylindrical section (42) near the end of the stroke; a cushioning passage (63) formed in the holder (61), and which guides hydraulic fluid from a hydraulic chamber (2) to a supply and discharge port (41) when the annular entry section (62) has entered the holder (61) and the cylindrical section (42); and an orifice plug (64) fastened to the cushioning passage (63). The cushioning passage (63) comprises an internal passage (67) extending in the radial direction of the holder (61), and to which the orifice plug (64) has been fastened. The orifice plug (64) can be replaced, via a replacement port (71) formed so as to pierce the cylinder tube (10) and connect to the internal passage (67). |
