Heavy-duty power transmission V-belt

摘要

The invention provides a block-type heavy-duty power transmission V-belt including a large number of blocks (7) fixedly engaged with tension members (1) by fitting the tension members in fitting grooves (8) formed on side faces of the blocks (7). In a reinforcing member (12) embedded in each of the blocks (7), a beam angle between a vertical center line (L) of an upper beam part (13) disposed above the fitting groove (8) and a pulley groove face (P1) closer to the center of a pulley than a portion of the pulley in contact with an upper contact part of the block is 90 DEG or more. In this manner, to the base of the upper beam part (13) is applied merely tensile stress derived from a shearing force working in a lengthwise direction of the belt between the block (7) and the tension member (1), or tensile stress reduced correspondingly to compressive stress derived from downward bending moment applied to the upper beam part (13) due to a reaction force from the pulley groove face (P1). As a result, the stress applied to the base of the upper beam part (13) can be reduced, so as to increase the transmission load of the belt without increasing the weight of each block (7).