Patent ID: 11879520
Assignee: MITSUBOSHI BELTING LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC D  F | IPC D  F

Claim 0:
1. A V-ribbed belt comprising:
a compression rubber layer formed of a rubber composition containing a rubber component comprising an ethylene-α-olefin elastomer; and
a core wire, and
having a tensile elastic modulus of 240 to 500 N/(mm·%),
wherein:
the tensile elastic modulus of the V-ribbed belt is expressed as an amount of force required to stretch a belt of 1 mm width by 1% length,
the core wire comprises:
a core yarn comprising a high-elastic modulus fiber having a tensile elastic modulus of 200 to 900 GPa; and
a plurality of sheath yarns each comprising a low-elastic modulus fiber having a tensile elastic modulus of 50 to 150 GPa and disposed around the core yarn,

the plurality of sheath yarns are twisted together around the core yarn, and wherein the core wire has a ratio of an average diameter of the sheath yarns to an average diameter of the core yarn of 0.2 to 0.4,
each of the sheath yarns is twisted in a same direction as a direction in which the twisted sheath yarns are further twisted with the core yarn,
a total fineness of the core yarn is 200 to 600 tex, and
the sheath yarns have the average diameter of 0.13 to 0.25 mm.