Patent ID: 8177435
Filing Date: 2012-05-15
Classification: B21D,B21K,F16C,Y10T

Abstract:
1. A method of manufacturing a drawn cup needle roller bearing having a seal ring, the drawn cup needle roller bearing comprising: a shell having a raceway surface on a circumferential face and also having flange portions in both end portions; a cage having a plurality of pockets in a circumferential direction; a plurality of needles retained in the pockets so that the needles freely rotate along the raceway surface; and a cylindrical seal ring arranged between an end face of the cage and the flange portion of the shell, wherein the seal ring composes a floating seal and a height of a cross section of the needle roller bearing is 1.0 to 3.5 mm, the method comprising: piercing a metal plate to form a first preliminary intermediate material having a first circular hole;