Patent ID: 8814735
Filing Date: 2014-08-26
Classification: F16G

Abstract:
1. A metal V-belt for transmitting torque between two pulleys of a belt-type continuously variable transmission, each of the two pulleys having a V-shaped groove, the metal V-belt comprising: two parallelly extending laminated steel bands; and a plurality of identical steel elements, each having at opposed sides of the steel element tapered flanks that are configured to contact conical faces of the two pulleys, wherein each of the two parallelly extending laminated steel bands is positioned in an opposed groove of each of the steel elements, such that when a torque transmission occurs between the two pulleys having the metal V-belt tightly between the two pulleys, a force for biasing the steel elements radially outward from each of the two pulleys is supported by the two parallelly extending laminated steel bands, and a force for pressing the steel elements toward one another is supported by the steel elements, wherein each of the tapered flanks includes raised portions that contact the conical faces of each of the two pulleys through an oil layer, and grooves that discharge lubrication oil in a circumferential direction of each of the two pulleys, wherein the raised portions successively alternate with the grooves, wherein a flatness ratio comprising a ratio of the width of one of the raised portions to a sum of the width of one of the raised portions and the width of one of the grooves and the ratio multiplied by one-hundred equals a set flatness ratio within a flatness ratio range that allows for production of the raised portions and grooves in a geometrical shape, wherein a groove pitch comprising a distance between two of the grooves equals a value within a range of values that allows for production of the grooves in the geometrical shape and oil discharging from the grooves, wherein the range allows for both the production in the geometrical shape and the oil discharging from the grooves while satisfying the set flatness ratio, wherein each of the raised portions is a rounded surface having a first edge portion, a second edge portion and a middle portion between the first and second edge portions, wherein a height of the middle portion is greater than a height of the first and second edge portions, and wherein each of the grooves comprises a V-shaped cross-section.