| 摘要 |
PURPOSE:To improve a durability of the rotor and enable a press forming of passage groove at an outer circumference of the rotor by a method wherein the position adjacent to both ends of the passage groove contacting with the inner circumference of the sleeve is made to be hard at the outer circumference of the rotor with high frequency quenching. CONSTITUTION:High frequency quenching is applied only to both axial ends of the passage groove 12 contacting with the inner circumference of the sleeve 11 at the outer circumference of the rotor 10, then the passage groove forming part 41 held by the high frequency quenching part 40 is applied with quenching and annealing. The passage groove 12 may be easily formed with a chamber 12a under a high accuracy by a plasticizing work such as pressing operation.
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