| 摘要 |
PROBLEM TO BE SOLVED: To implement stable sealing effect with simple structure, prevent leakage of fluid small in pressing force such as oil mist, dry air, and a low- pressure coolant, and enable to carry out seal of a high-pressure coolant. SOLUTION: In seal structure for a floating shaft supporting portion of a rotary joint in which a floating shaft portion of a floating seat is installed to a fuel supply passage bored in a casing so that the floating shaft portion is capable of sliding through an O-ring 6. The O-ring 6 is disposed in a free mounting state into a mounting groove 5 so that the O-ring 6 can bring into contact with the low-pressure side of the mounting groove 5 and the circumference of an outer circumferential face of a floating shaft 15 which relatively moves to a side face 5b of the mounting groove 5. Further, the O-ring 6 is lightly pressed to the side face 5b of the mounting groove 5 by a spring 7 arranged in the mounting groove 5. An outer circumferential face of the floating shaft 15 is formed in a size capable of being lightly contact with the O-ring 6. |
