| 摘要 |
PURPOSE:To attempt improvement of wear resistance and burning resistance by providing a number of oil retaining recesses encircled by chilled layer dispersedly on a sliding surface other than the oil seal sliding surface of a side housing. CONSTITUTION:In a casing consisting of a rotor housing with a trochoid inner circumferential surface and a pair of a right and a left side housing 7 provided at both sides of said housing, the sliding surface 7a of the side housing 7 is formed cut of a cast iron plate 7b so as to be a composite casting product where said cast iron plate is internally chilled with an aluminum metal. And a chilled layer 9 is dispersedly formed on an oil seal sliding surface (c) in the outside of the sliding surface made of the cast iron plate 7b, and furthermore oil retaining recesses 11, the bottom of which is encircled by a chiiled layer 10, are dispersedly formed on the outer sliding surface (d) in the outside of said sliding surface (c). Owing to this constitution, lubricant is retained in the recesses 10 thereby improving lubricity against sealing members fitted on a rotor 1.
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