| 摘要 |
PURPOSE:To restrict the biassed abrasion of a circumferential seal by a constitution wherein a crossbar seal is worn out more easily than the circumferential seal. CONSTITUTION:The crossbar seal 17B is formed by a material, such a boron nitride or the like, which prominent in lubricating properties and having lower hardwearing properties compared with the circumferential seal 9B. The crossbar seal 17B precedes the circumferential seal 9B in wearing, in accordance with the rotation of a core, therefore, a load applied to these seal members 9B, 17B are distributd to the whole circumference of the circumferential seal 9B mainly upon sliding and the biassed abrasion will never be caused thereby keeping the uniform condition of sliding contact on the whole of the sealing device. |
