Patent ID: 11920652
Assignee: NOK CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A torsional damper comprising:
a hub fixed to a rotating shaft and having an outer peripheral surface on a circumference around the rotating shaft;
an annular vibration ring having, on a circumference around the rotating shaft, an inner peripheral surface which is larger in diameter than the outer peripheral surface of the hub; and
a rubber ring which is present in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibration ring, which is made of a rubber composition primarily composed of EPDM, and which has a loss factor (tanδ) of 0.18 or more at a surface temperature of 60±5° C.,
wherein, when the torsional damper is subjected to a resonance point tracking process, a maximum attained surface temperature (Tmax) of the rubber ring at a resonance point during continuous excitation and a rubber thickness (c) satisfy:

Tmax≤−6.0c+86.7,  Formula (1)

1.0≤c≤5.6, and  Formula (2)

Tmax≥6.0c+54.0.  Formula (3)