| 摘要 |
The churning type of grease 5 of a viscosity of 15-20 mm<2>/s and a worked penetration of 200~230 is disposed at the rolling surface 1a of the race portions and the channeling type of grease 6 of 25~35 mm<2>/s and a worked penetration of 240~270 is disposed at the retainer 4. By constituting as such, at rotation of the ball bearing, by maintaining the lubricant oil film 7 in the bearing the lubrication can be continued, and at non-rotation of the ball bearing the lubricant oil film 7 is protected by the grease 5 to prevent the fretting.
|
