Patent ID: 7780556
Filing Date: 2010-08-24
Classification: F16G,F16H

Abstract:
1. A belt drive system including: a drive V-belt having a large number of blocks engagingly fixed in mating relation to a pair of tension members; and a V-pulley formed with a groove for wrapping the V-belt therearound, the belt drive system being configured to transmit power by contact of side faces of the V-belt with the surface of the groove in the V-pulley, wherein the surface of the groove in the V-pulley is configured so that the following relational expression holds between tp and y of a roughness curve indicating the surface features of the surface of the groove in the V-pulley where tp is the load length rate, which is a function of both the heights and widths of microscopic hills on the surface of the groove of the V-pulley and is a percent rate of load applied per length to the surface of the groove of the V-pulley at a given position of the roughness curve in a direction of height and y is the degree of height indicated by a percentage of the ratio of the height from a lowest valley on the surface of the groove of the V-pulley having a maximum depth to the given position to a hill maximum height Ry, where tp is greater than 20% and less than 100%.