ANGULAR BALL BEARING, AND MACHINE TOOL USING SAME

摘要

PROBLEM TO BE SOLVED: To consistently feed lubricating oil to a rolling part in grease lubrication even in any attitude, to stabilize the strength of a holder during the rotation at high speed, and to reduce the temperature rise. SOLUTION: Grease storage grooves 6 and 6 connected to a raceway groove 2a are formed in an inner circumferential surface of an outer ring 2 on both sides of the raceway groove 2a. The grease storage groove 6 is provided so as to ensure a contact surface of the raceway groove 2a of the outer ring 2 with the ball 3. When the holder 4 is of outer ring guide type, a holder guide surface 8 of the outer ring 2 is provided on both sides of the raceway groove 2a.