VERFAHREN ZUM HERSTELLEN EINES RANDES AN MEHRFACH-KEILRIEMENSCHEIBEN UND MIT DIESEM VERFAHREN HERGESTELLTE ERZEUGNISSE

摘要

PCT No. PCT/JP89/00699 Sec. 371 Date Feb. 5, 1991 Sec. 102(e) Date Feb. 5, 1991 PCT Filed Jul. 11, 1989 PCT Pub. No. WO91/00785 PCT Pub. Date Jan. 24, 1991.The invention relates to a sheet metal made poly-V pulley in which poly-V grooves (10) to be engaged with poly-V belt are formed in the outer circumference of peripheral wall (5) of a cup-shaped blank (3) integrally forming the peripheral wall (5) extending in the direction orthogonal to the bottom wall (6) at the end part of the bottom wall (6), and annular ears (7, 9) of single layer projecting outward in the radial direction for preventing dislocation of the poly-V belt are formed at both ends of the peripheral wall (5), wherein the end part inner surface side of the bottom wall (6) side of the peripheral wall (5) is bulged inward in the radial direction when forming the ears (7) or before forming the ears (7) to thicken the bottom wall side end part of the peripheral wall, and hence the wall thickness of the bottom wall (6) side end part of the peripheral wall (6) is maintained even when a thin cup-shaped blank (3) is used, so that the problems of the strength, material cost and weight increase may be solved.