| 摘要 |
PURPOSE:To raise degree of freedom of selecting the kind of hydraulic oil by lubricating the sliding part between a piston rod and a cylinder end part by means of oils and fats other than the hydraulic oil. CONSTITUTION:A closing member 7 is provided on the opening end of a cylinder 4 from which a piston rod 5 is projected, and an annular recession part 13 demarcated by means of oil seals 11, 12 is formed in the closing member 7. The recession part 13 is filled with oils and fats O2 which are, different from the hydraulic oil O1, and rich in lubrication power. Thus, the hydraulic oil O1 can be freely selected without taking lubrication power to the piston rod 5 into consideration. |
