Scroll-type apparatus having a pivoting main journal bearing

Details Scroll-type apparatus having a pivoting main journal bearing Scroll-type apparatus having a pivoting main journal bearing

1986-09-18

1988-03-15

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

418 57, 384312, F01C 104, F01C 2102, F16C 1703

Patent

active

047309989

ABSTRACT:
A scroll-type apparatus having a main journal bearing which journals the drive shaft of the apparatus and is capable of pivoting by small angles with two degrees of freedom. The main journal bearing comprises three or more arcuate pads whose inner surfaces journal the drive shaft and which are pivotably supported by a stationary main bearing housing. In a preferred embodiment, each of the pads has a spherical protrusion and two rotation-preventing pins secured to its back surface. The protrusions contact the inner surface of the main bearing housing and pivotably support the pads, while the rotation-preventing pins are inserted into grooves formed on the inner surface of the main bearing housing. When a load is applied to the drive shaft causing it to tilt, the pads of the main journal bearing can tilt along with the drive shaft by pivoting about the points of contact between the spherical protrusions and the inner surface of the main bearing housing, thereby preventing edge loading of the main journal bearing.

REFERENCES:
patent: 1161721 (1915-11-01), Parsons
patent: 4141677 (1979-02-01), Weaver et al.
patent: 4431388 (1984-02-01), Eber et al.
patent: 4473343 (1984-09-01), Hazaki et al.
patent: 4580911 (1986-04-01), Burkhard et al.
patent: 4597676 (1986-07-01), Vohr et al.

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