| 摘要 |
PURPOSE:To ensure high insulating performance without degrading the adhesion of a flame sprayed layer by providing the flame sprayed layer made of a hard material on the seal sliding surface of a aide housing made of aluminum alloy whereby forming an anodic oxide film underneath said layer. CONSTITUTION:In a casing consisting of a rotary housing with a trochoid inner circumferential surface and a pair of a right and a left side housing 1, a flame sprayed layer 15 made of a hard material such as Cr3, Cr2 and the like possessing good sliding characteristics, is formed on the seal sliding surface 6 of the side housing 1, on which sealing members such as the oil seal and side seal of a rotor and the like slide. And an anodic oxide film 17 treated by anodization is formed underneath a surface joining the flame sprayed layer 15 with the rotor housing, that is, on the front surface 8 of a base metal 16 (Al alloy and the like) such as the inner wall and the like of a water jacket 9. Owing to this constitution, high insulating performance is ensured without degrading the adhesion of the flame sprayed layer 15 made of the hard material endowing the seal sliding surface 6 with wear resistance.
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