| 摘要 |
PURPOSE:To restrain the wear of a vane by forming a rotary sleeve which is rotatably and loosely fitted in a housing with a spherical graphite cast iron of a ferrite structure. CONSTITUTION:A rotary sleeve 4 having a slightly smaller diameter than the inside diameter of a center housing 2 and a rotor 5 are housed in a housing 1. Vanes 8 are projected out of the outer peripheral face of the rotor 5 due to a centrifugal force accompanying the rotation of the rotor 5 and the brought into contact with the inner peripheral face of the rotary sleeve 4. The rotary sleeve 4 is formed with a spherical graphite cast iron of a ferrite structure. Thereby, the structure and hardness of the base material can be made uniform restraining the degree of wear of the vane. |
