| 摘要 |
PURPOSE:To improve abrasion resistance by setting a ring harder than the material of a rotation scroll at the boss part of the rotation scroll so as to insert into an engage with and engagement recess part. CONSTITUTION:A ring 15 being harder than the material of a rotation scroll 10 is set at the boss part 14 of a rotation scroll 10. The upper end part of a crank shaft 4 becomes a main shaft part 16 and an engagement recess part 17 is provided there. A metal 19 is engaged along the periphery of the engagement recess part 17, which so supports a boss part as to rotate freely 14 through the ring 15. Accordingly the abrasion at the boss part 14 of the rotation scroll 10 and at the engagement recess part 17 of a crank shaft 4 is contrived to improve.
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