Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1989-12-04
1991-08-27
Cuda, Irene
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
29464, 418 551, B23P 1500
Patent
active
050421506
ABSTRACT:
A scroll compressor includes an electric motor formed of a stator and a rotor, the rotor having a shaft which is supported by upper and lower bearings. To ensure precise alignment of the upper bearing, lower bearing, and stator within the tubular shell, the lower bearing is a two-piece assembly comprising an outer ring portion and an inner bearing plate. The upper bearing, the stator, and lower bearing outer fing portion are inserted into the tubular shell. An alignment arbor, in the form of a spindle carrying the lower bearing outer ring portion, is inserted into the stator. The upper bearing is installed in the shell onto the arbor. The alignment arbor is expanded against the stator, the upper bearing and the lower bearing outer ring portion to ensure precise alignment. Then the upper bearing, crankcase and lower bearing outer ring portion are affixed, e.g. welded to the tubular shell. The arbor is collapsed and withdrawn. Then the rotor is inserted, and the inner bearing plate of the lower bearing is installed to journal the lower end of the rotor shaft. This compressor assembly significantly simplifies the assembly process while achieving precise alignment. This yields improved reliability, startability, and efficiency.
REFERENCES:
patent: 4552517 (1985-11-01), Shimizu
patent: 4564339 (1986-01-01), Nakamura et al.
patent: 4655696 (1987-04-01), Utter
patent: 4730375 (1988-03-01), Nakamura et al.
patent: 4753582 (1988-06-01), Morishita et al.
patent: 4811471 (1989-03-01), Etemad et al.
Carrier Corporation
Cuda Irene
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