| 摘要 |
A temperature-operated fluid friction coupling is actuated by a flow of viscous fluid flowing into or out of shearing surface gaps disposed therein. The coupling of the invention includes an additional valve opening penetrating a partition and an additional valve lever mounted on the partition. The additional valve lever is made of a bimetallic element or bidirectional shape memory alloys such that it curves at a considerably low temperature near the standard ambient temperature, allowing the second valve opening to open and close. Thus, the fan idling speed during OFF condition of the coupling can be set considerably low in comparison with conventional designs.
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