| 摘要 |
PROBLEM TO BE SOLVED: To absorb the expansion of a bearing by a simple constitution, and enhance assemblage by rotatably supporting a rotating shaft via the bearing where a polymer material high in an expansion coefficient is fitted in the outer circumference. SOLUTION: A rocking scroll 7 is driven by the eccentric bush 28 of a driving device 25 mounted onto a rotating shaft 18 inserted into the boss part 13, and it is revolved over a circular orbit by an Oldham's coupling 36 in such a way as not to be rotated with respect to a stationary scroll 6. Both the stationary scroll 6 and the rocking scroll 7 permit a compressed space 14 formed by these scrolls to be gradually contracted inwardly from the outer side, so that air having flowed in from a suction port 31 is thereby compressed. At this time, both the main bearing 4 of a frame 5 and the auxiliary bearing 19 of a motor cover 15 are expanded because of heat generated by the operation of a compressor 1, however a polymer material 22 is also expanded so as to allow each gap between the main bearing 4 and a ball bearing 24, and between an auxiliary bearing 19 and a ball bearing 25 to be filled up by the polymer material, so that outer race holding force is thereby maintained. |
