FAN COUPLING DEVICE OF TEMPERATURE SENSITIVE FLUID TYPE

摘要

PROBLEM TO BE SOLVED: To provide a fan coupling device of temperature sensitive fluid type capable of stably controlling (stabilizing a temperature characteristic) the fan rotation in response to an indication of temperature. SOLUTION: The inside of a sealed vessel journaled onto a rotating shaft body having a driving disk 5 fixed to its tip is partitioned to oil reservoir 3 and a torque transmitting chamber 2 internally having the driving disk 5 by a partition 4. The fan coupling device comprises a circulating flow passage communicating from the torque transmitting chamber 2 side to the oil reservoir 3 side and a valve member 8 for opening or closing a supply port communicating from the oil reservoir 3 side to the torque transmitting chamber 2 side. The fan coupling device has a mechanism for directly introducing the oil in the oil reservoir 3 from an outflow adjusting hole 4-1 in the partition 4 into the hollow driving disk 5, the driving disk 5 has at least one conduction groove of the introduced oil in the hollow inner peripheral wall surface of the disk and has a small-diameter inner peripheral wall disk structure so that the oil amount is minimized for driving, and the conduction groove has a flowing hole 5-2 connecting with a torque transmitting clearance.