| 摘要 |
In order to provide a fastener sealing system that is operable in an environment of high ambient temperature, while at the same time utilizing seals that are made of materials that are ordinarily not capable of withstanding such high ambient temperature, the system includes a boss integrally associated with a housing defining a cooled interior chamber. The boss has a fastener-receiving opening formed by a bore and a counterbore defining an inwardly projecting shoulder therebetween. In the vicinity of the inwardly projecting shoulder, the boss is exposed to cooling within the cooled interior chamber, and a fastener is provided having a shank portion with a first diameter substantially the same as the diameter of the bore in the boss along a portion of the length thereof and a second diameter substantially the same as the diameter of the counterbore in the boss along the remainder of the length thereof. The fastener is releasably retained within the cooled interior chamber defined by the housing. The system also includes a resilient seal adapted to receive the shank portion of the fastener so as to be located in or near engagement with the inwardly projecting shoulder when the fastener is releasably retained within the cooled interior chamber. With this arrangement, the resilient seal is isolated from the high ambient temperature at a point where the boss is exposed to cooling within the cooled interior chamber in a manner facilitating the utilization of conventional seal materials.
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