Belt construction, the combination of the belt construction and a pulley and methods of making the same

In an endless power transmission belt construction having opposed side edge means and having opposed inner surface means and outer surface means with each said surface means defining a plurality of longitudinally disposed and alternately spaced apart like projections and grooves, said belt construction having a certain thickness between the roots of said grooves in said opposed surface means thereof, said belt construction being adapted to have one of said inner surface means and said outer surface means thereof mesh with a ribbed outer peripheral surface means of a rotatably pulley means that has said ribbed surface means defining a plurality of longitudinally disposed and alternately spaced apart like projections and grooves that respectively have portions thereof for serially meshing respectively with cooperating portions of said grooves and projections of said one surface means of said belt construction, the improvement wherein the depth of said grooves of each said surface means of said belt construction is substantially less than the approximately 2.4 mm depth of the grooves of a similar belt construction that is adapted to have one of the opposed surface means thereof mesh with said ribbed surface means of said pulley means, the depth of said grooves in said inner surface means of said belt construction being substantially the same as the depth of said groove in said outer surface means of said belt construction, said depth of said grooves of said belt construction being approximately 2.0 mm, said certain thickness of said belt construction being approximately 2.82 mm and the entire thickness of said belt construction being approximately 6.82 mm, at least one of said surface means of said belt construction being cogged.