| 摘要 |
<p>A sealing arrangement comprises a sealing structure especially for sealing a gap (10) between a lower part (11) and an upper part (12) moveable in relation to the lower part (11), the upper part defining an opening (51) which passes at least part of the sealing structure during relative movement of the upper and lower parts. The sealing structure comprises a sealing ring (13) having a generally U-shaped cross-section and being mounted in a channel or groove (14), which is defined in the lower surface part (11). The channel (14) has a bottom surface part and a pair of opposite upper side surface parts extending in converging relationship in a direction opposite to the bottom surface part, so as to define a constricted aperture of the channel. The sealing structure further comprises a first biasing or preloading member (23) being in abutting engagement with the bottom surface part (15) of the channel and with the adjacent bottom surface (24) of the sealing ring for biasing or preloading the sealing ring in a direction out of the channel, whereby sealing lips (30, 31) of the sealing ring are pressed into tight engagement with the adjacent upper part (12), a second biasing or preloading member (38) mounted within the sealing ring (13) for biasing or preloading side parts or sealing members thereof away from each other in opposite directions and toward the respective sloping side surface parts (27, 28) of the channel (14). <IMAGE></p> |
