Patent ID: 11913515
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 (tan δ) 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 vibration ring thickness (a) satisfy:

Tmax≤−2.7a+124.3,  Formula (1):

1.6≤a≤9,  Formula (2):

Tmax≥−12.2a+129.5, and  Formula (3):

Tmax≥7.7a+16.1.  Formula (4):