| 摘要 |
A roller bearing retainer comprising a substantially ring-shaped member having a plurality of ball pockets formed thereon to hold rolling members. Each ball pocket has a flat portion formed at its bottom portion and an opening portion extending from the flat portion of the retainer's ball pockets for receiving a rolling member. Each rolling member is held by a ball pocket having the flat portion whereby movement of the rolling member is suppressed. At the same time, a sufficient gap may be formed between the rolling member and a concave surface other than the flat portion. Thus, lubrication oil may readily be placed into the gap.
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