Birch, Stewart, Kolasch & Birch
Radial roller bearing
 A radial roller bearing consisting of rings and rollers, either the rolling contact surface of each roller or the raceway surfaces of the rings or both are crowned, the amount of crowning which is defined as .DELTA.t/l i.e., the depth of crowning .DELTA.t to the effective roller length of l, is set to 0.0007 to 0.002, the ring has a rib at its one end, the end surface of each roller which makes contact with the rib is spherically convex, while the contacted surface of the rib is spherically concave. 
Koyo Seiko Co., Ltd.
F F F F F F F F
F16C F16C F16C F16C F16C F16C F16C F16C
inventional additional inventional inventional additional additional inventional inventional
Yasuo Masamichi
Asai Takeuchi