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4-point contact ball bearing

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Product Summary

4-point contact ball bearing is a kind of device which can suppress both fluctuations in the contact points between balls and the raceway surfaces and increases in the rotational slipping of the balls due to machining errors in the raceway surfaces and the like, and can suppress differential slip between the raceway surfaces and the balls.

4-point contact ball bearing has four ring-shaped contact surfaces for forming a ring-shaped raceway between them, each ring-shaped contact surface has a sectional profile defined by a concave curve when cut along a plane including a central axis of rotation of each ball and a central axis of rotation of the ring-shaped raceway. It comprises an inner ring formed in an outer circumferential surface thereof with two ring-shaped contactsurfaces, an outer ring formed in an inner circumferential surface thereof with two ring-shaped contact surfaces, and a ring-shaped raceway formed between the four ring-shaped contact surfaces, and balls inserted into the ring-shaped raceway so that they are free to roll along the ring-shaped raceway.

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