Patent ID: 7273318
Filing Date: 2007-09-25
Classification: C21D,F16C

Abstract:
1. A thrust needle roller bearing comprising: a plurality of needle rollers and two annular cages, each of the cages being formed with a plurality of pockets each having a radial length longer than the height of the roller, each one of the two annular cages holding the needle rollers by sandwiching the needle rollers between the two cages within roller holding portions formed in the pockets of each annular cage and said roller holding portions projecting from a wall defining said pocket for contacting said needle rollers; the radial length of each of the roller holding portions of the two cages is formed shorter than the radial length of the pocket; the two cages are assembled by folding them as a unit so that both the portions of the unit on either a radially outer and radially inner side of the roller holding portions have their axial thickness smaller than that of the opposing roller holding portions and the portions of the unit on the radially outer and radially inner side are axially offset from both the roller holding portions; and the two cages are secured to one another at both their radially outermost and innermost end portions.