TRANSMISSION FRICTION PLATE AND DEVICE

摘要

A method of edge coiling annular steel plates for transmission friction plate devices in which straight tapered strip steel stock with prime spline tangs on one edge are edge rolled into open annular steel plates with finished spline tangs leaving a gap between the unjoined free ends. The strip steel stock is slit into straight flat strips having a width double the total face width of the annular plate. The flat double width strip is rolled to provide a symmetrical tapered double width strip having a central thick flat portion and on each side a symmetrically tapered portion with thin edges. The double width tapered strip is blanked in the central portion to form uniformly spaced prime spline tangs each having a central recess and slit to divide the double width strip into two single width tapered strips with the recessed prime spline tangs on the thick edge. The single width tapered strips are edge rolled in an edge rolling machine feeding the strips in a straight guide to a coiling roll having a cylindrical surface with relief recesses and a tooth in each relief recess to engage the thick edge of the strip with the relief recesses providing clearance for the prime spline tangs and the tooth engaging the base of the central recess for uniform circular coiling and having side guides spaced apart the mean thickness of the tapered strip to hold the coil flat. Then the end coil is cut off to form the open annular steel plate.