Friction Transmission Belt, Cord for Same, and Manufacturing Method for Same
AssigneeMitsuboshi Belting Ltd.
InventorsMasashi Tamura, Takeshi Tsuji, Takuya Tomoda
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Abstract
The present invention pertains to a friction transmission belt that includes a core cable. The core cable includes a cord comprising: a core yarn containing high elastic-modulus fibers; and a plurality of sheath yarns that are disposed around the core yarn and that contain low elastic-modulus fibers. The cord is twisted and the proportion of the average diameter of the sheath yarn to the average diameter of the core yarn is 0.2 to 0.4.
Claims15
A frictional power-transmission belt comprising a core wire, wherein
- the core wire comprises a cord comprising:
- a core yarn comprising a high-elastic modulus fiber;
- and
- a plurality of sheath yarns each comprising a low-elastic modulus fiber and disposed around the core yarn, and
- the cord is a secondarily-twisted cord and 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.
A method for manufacturing a frictional power-transmission belt comprising:
- forming a rubber sheet formed of an unvulcanized rubber composition and embedded with a core wire into a predetermined shape;
- and
- vulcanizing a formed body, wherein
- the core wire comprises a cord comprising:
- a core yarn comprising a high-elastic modulus fiber;
- and
- a plurality of sheath yarns each comprising a low-elastic modulus fiber and disposed around the core yarn, and
- the cord is a secondarily-twisted cord and 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.
A cord comprising:
- a core yarn comprising a high-elastic modulus fiber;
- and
- a plurality of sheath yarns each comprising a low-elastic modulus fiber and disposed around the core yarn,
- being a secondarily-twisted cord, and
- having a ratio of an average diameter of the sheath yarns to an average diameter of the core yarn of 0.2 to 0.4.
A method for manufacturing a cord comprising:
- disposing a plurality of sheath yarns each comprising a low-elastic modulus fiber around a core yarn comprising a high-elastic modulus fiber;
- and
- performing a secondary-twisting, wherein
- a ratio of an average diameter of the sheath yarns to an average diameter of the core yarn is 0.2 to 0.4.
Dependencies are inferred from the claim text.