| 摘要 |
A rotary joint includes a fixed-side member (1), a rotational-side member (2) and a fluid-tightly sealed portion (4) which is formed in a region between two rotation seals (3a, 3b) arranged on a relative rotating face (F) between the fixed-side and the rotational-side members (1, 2). The rotary joint is further provided with a first passage (5) extending from the fixed-side member (1) to the rotational-side member (2) through the fluid-tightly sealed portion (4) of the relative rotating face (F) and a second passage (6) extending from the rotational-side member (2) to the fixed-side member (1) through the fluid-tightly sealed portion (4) of the relative rotation face (F). The first and second passages (5, 6) are arranged in a 180-degree interval and provided with grooves (51, 61) arranged on the fixed-side member (1) or the rotational-side member (2) side. The grooves (51, 61) are arranged along the fluid-tightly sealed portion (4), in a range slightly smaller than 180 degree and not to interfere with each other. <IMAGE> |
