| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller cage constituting part of a roller tool for working and having a long effective life. SOLUTION: The roller cage 1 has a square column shape main body 1, a first channel shape recessed part 11 and a second channel shape recessed part 12. The square column shape main body 1 is constituted so that a roller to work a crank shaft journal is guided by first recessed face recessed parts 7, 8 as well as second recessed face recessed parts 9, 13.
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