| 摘要 |
<p>A sealing structure (10, 110) for use in a joint (11) having a first member (12) axially movable relative to a second member (14). The first member defines a recess (13) receiving the sealing structure which includes an annular seal ring (19, 119) having a radially outer annular base portion (20, 120) fitted in the recess, a sealing portion (21, 121) having a lip (22, 122) engaging a surface (15) of the movable member (14) confronting the recess (13). The sealing portion is provided with a stiffener which is bonded or partially encapsulated therein and provided with axially inwardly projecting tongues (30, 130) engaged by a spring structure (24, 124). In the illustrated embodiment, the spring structure includes one or more Belleville springs (25, 26, 125) received within the base portion (20, 120) of the seal ring and having outer portions (27, 127) axially inwardly engaging a flange (32, 132) inturned by the axially inner portion of the base. The Belleville springs are arranged to deflect past the flat disposition thereof in the range of movement between the joint members so as to provide an effectively minimum variation in the sealing force applied thereby. </p> |
