| 摘要 |
PURPOSE:To improve the lubrication performance of a bearing by forming a number of convex sections between the concave section of the bottom wall of an outer wheel and the surface groove which is formed between the bottom and side walls and effectively introducing grease on the contact surface. CONSTITUTION:The concave 42 is formed at the center of the bottom wall 41 of the shell outer wheel 4 and the surface groove 44 of grease in the connection section between the bottom 41 and the cylindrical side wall 43. A number of convex sections 46 are formed on the central section's circumference of the flat section 45 between the outer edge of the concave 42 and the inner edge of the surface groove 44. This bearing effectively introduces the grease near the convex section 46 by the swing rotation of the shaft and improves its lubrication performance. |
