| 摘要 |
A fluid-friction coupling includes a housing defining a space. The housing includes a partition wall separating the space into a reservoir chamber defining an oil-wet region and a work chamber. A drive disc is rotatably mounted in the work chamber and a drive shaft is connected to the drive disc so as to be rotatable therewith. The partition wall has a valve port formed therein. A valve arm is mounted in the housing for controlling the valve port and is movable in a closure direction through a total displacement (s) from an open position wherein the valve port is clear to a closed position wherein the valve port is closed. An external bimetal is mounted outside of the housing for actuating the valve arm so as to move the valve arm from the open position to the closed position. An internal bimetal is mounted in the oil-wet region of the reservoir chamber for imparting a movement to the valve arm in the closure direction when the internal bimetal reaches a predetermined limit temperature. The internal bimetal is an internal bimetal member having a first end at which the bimetal member is attached to the housing. And stop is mounted in the reservoir chamber for limiting the movement imparted to the valve arm by the internal bimetal member to only a partial displacement (s1) toward the closed position thereby leaving a residual displacement (s0) of the total displacement (s).
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