Usually, the outer ring of the TL bearings has grease groove, bearings having no grease groove are to be provided, too. 外球面球轴承外圈一般带油槽，也生产外圈无油槽的产品。
There is one oil groove in the bronze bushing, where lubricant can flow into the axis from the oil hole on the cap of housings. 轴瓦内表面的不承担载荷部分开有油槽，润滑油通过进油孔和邮沟流进间隙。
