| 简介 |
PROBLEM TO BE SOLVED : To provide a structure capable of integrating a differential case and a ring gear by casting, while sufficiently securing strength characteristics required as the ring gear in a differential device component having the differential case formed to store a differential gear mechanism and the ring gear provided to be integrally rotated with the differential case.
SOLUTION : In a differential device component (ring gear integrated type differential case 12) of this invention, a differential case and a ring gear are integrally formed by graphite cast steel in a seamless manner. The graphite cast steel contains 0.5-1.5 mass% carbon (C), 1.5-3.9 mass% silicon (Si), 0.2-1.5 mass% manganese (Mn), 0.01-0.5 mass% rare earth element (REM), 0.01-0.4 mass% calcium (Ca), and the balance being iron (Fe) and unavoidable impurities.
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