| 摘要 |
A scroll compressor (16) includes an electric motor formed of a stator (25) and a rotor (39), the rotor having a shaft which is supported by upper and lower bearings (23, 28). To ensure precise alignment of the upper bearing (23), lower bearing (28), and stator (25) within the tubular shell (11), the lower bearing (28) is a two-piece assembly comprising an outer ring portion (29) and an inner bearing plate (34). The upper bearing (23), the stator (25), and lower bearing outer ring portion (29) are inserted into the tubular shell (11). An alignment arbor (50), in the form of a spindle carrying the lower bearing outer ring portion (29), is inserted into the stator (25). The upper bearing (23) is installed in the shell (11) onto the arbor. The alignment arbor is expanded against the stator (25), the upper bearing (23) and the lower bearing outer ring portion (29) to ensure precise alignment. Then the upper bearing (23), crankcase and lower bearing outer ring portions (29) are affixed, e.g. welded to the tubular shell (11). The arbor is collapsed and withdrawn. Then the rotor (39) is inserted, and the inner bearing plate (34) of the lower bearing (28) is installed to journal the lower end of the rotor shaft (40). This compressor assembly significantly simplifies the assembly process while achieving precise alignment. This yields improved reliability, startability, and efficiency. <IMAGE> |
