Enclosed motor-driven compressor

Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...

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184 616, F04B 3902

Patent

active

052520390

ABSTRACT:
An enclosed motor-driven compressor includes a vertical crankshaft rotatably supported by two ball bearings and having an eccentric portion through which a motor element and a compressor element are operatively connected. The two ball bearings are disposed on opposite sides of the eccentric portion so that a reaction force of a piston which is exerted on the eccentric portion is supported evenly by the ball bearings. With the ball bearings thus arranged, the load on the crankshaft is lowered and the efficiency of the motor element is increased. A lubricating oil held at the bottom of a container is sucked through an internal groove of the crankshaft and then supplied from outlets to the respective ball bearings. The ball bearings thus lubricated have a prolonged service life. The compressor may have an oil sump disposed either above or below the ball bearing for improving lubricating condition of the ball bearing.

REFERENCES:
patent: 1990305 (1935-02-01), Myers
patent: 2738122 (1956-03-01), Gardiner
patent: 2875850 (1959-03-01), Glass
patent: 3248044 (1966-04-01), Parker
patent: 3663127 (1972-05-01), Cheers
patent: 3807907 (1974-04-01), Gannaway
patent: 4063853 (1977-12-01), De Grant
patent: 4396361 (1983-08-01), Fraser
patent: 4597720 (1986-07-01), Friedrichs
patent: 4632644 (1986-12-01), Fritchman
patent: 4700808 (1987-10-01), Maentjens
patent: 5038891 (1991-08-01), Wallis
patent: 5046930 (1991-09-01), Lindstrom

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