Patent ID: 7712967
Filing Date: 2010-05-11
Classification: F16C

Abstract:
1. A ball bearing comprising: an outer ring having a first raceway groove and a first ball filling slot which extends from the first raceway groove to a first end face of one side in an axial direction of the ball bearing; an inner ring having a second raceway groove and a second ball filling slot which extends from the second raceway groove to a second end face of said one side in the axial direction of the ball bearing; and balls provided between the first raceway groove of the outer ring and the second raceway groove of the inner ring, wherein circumferential extension grooves which extend from the first ball filling slot at opposite sides of the first ball filling slot in a circumferential direction of the ball bearing by a predetermined length, and extend from the raceway groove to the end face in the axial direction which correspond to the first ball filling slot, and the circumferential extension grooves have a maximum inner diameter smaller than a maximum inner diameter of the first ball filling slot.