| 摘要 |
PROBLEM TO BE SOLVED: To improve durability and reliability of a device by specifying each damper hub of presence or absence of cooling fins and a ratio of product of a radiating area of each inertia ring and each thermal conductivity. SOLUTION: Many cooling fins 18 extended in a radial direction are protruded on an outer side surface opposed to a circular rubber member 14 of a damper hub 12. A plurality of bolt holes 20 wherein attaching bolts for fixing the damper hub 12 to a crankshaft are inserted are provided inward of the radial direction. Many cooling fins 22 extended in a radial direction are protruded on an outer side surface opposed to the circular rubber member 14 of an inertia ring 16. A radiating area A and thermal conductivityαof the damper hub 12 and the inertia ring 16 provided with the cooling fins and a radiating area A0 and thermal conductivityα0 of the damper hub 12 and the inertia ring of absence of the cooling fins are set to (A×α)/(A0×α0)=2.0 to 4.0. When a torsional vibration ring is generated in the crankshaft while droving an engine, the inertia ring 16 is relatively rotated to the damper hub 12 while accompanying with elastic deformation of the circular rubber member 14 to decrease torsional vibration.
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