Patent ID: 9453554
Filing Date: 2016-09-27
CPC Classification: B29D,B29L,D03D,D04B,D10B,F16G,Y10S,Y10T

Claim Text:
1. A V-ribbed belt comprising a belt matrix and a ribbed surface covered with rib-cover fabric, said rib-cover fabric being stretchable in two predetermined directions said V-ribbed belt having a belt lateral direction and a belt longitudinal direction; wherein the belt matrix penetrates into the mesh of said rib-cover fabric; and wherein said V-ribbed belt is manufactured by molding, and during said molding, said ribbed surface is molded by expanding said belt matrix together with said rib-cover fabric arranged around the outside of said belt matrix toward the inner circumference of a shell having a plurality of grooves for molding a multi-ribbed structure on its internal circumference, and curing said belt matrix with said rib-cover fabric, said rib-cover fabric being stretchable to accommodate itself to said multi-ribbed structure; and wherein the tension per unit width of the rib-cover fabric in the belt lateral direction being less than or equal to a first value when the extension of said rib-cover fabric in the belt lateral direction has a value equal to the profile length of one rib in the belt lateral direction divided by the rib pitch, minus one; and wherein the tension per unit width in the belt longitudinal direction is less than or equal to a second value when the extension of said rib-cover fabric in the belt longitudinal direction has a value equal to the length of a rib tip in the belt longitudinal direction at said shell minus the length of said rib-cover fabric in the belt longitudinal direction at the beginning of the molding process, divided by the length of said rib-cover fabric in the belt longitudinal direction at the beginning of the molding process; and wherein said first value is approximately 250 N/50 mm, and said second value is approximately 50 N/50 mm.