Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1998-02-27
2000-06-20
Battista, Mary Ann
Machine element or mechanism
Control lever and linkage systems
Elements
74595, F16C 900
Patent
active
060764236
ABSTRACT:
A bellcrank mechanism (52) for applications in which unequal transverse forces (F.sub.i, F.sub.o) act on the two legs of a bellcrank support clevis includes a bellcrank bracket (64), a bellcrank (54) having a support clevis (56), and a set of bearings (84a, 84b) having unequal load bearing areas (99a, 99b). The bearings are installed in apertures (80) in the support clevis and are axially clamped to the support bracket to pivotably and transversely support the bellcrank so that relative pivotal motion occurs at the interface (102a, 102b) between the exterior surface (99a, 99b) of each bearing and the perimeter surface (100a, 100b) of the corresponding clevis aperture (80). The bearing having the larger load bearing area is aligned with the larger transverse force and the bearing with the smaller load bearing area is aligned with the smaller transverse force to improve the durability and reliability of the bellcrank mechanism. In one variant, each bearing is circumscribed by a similarly sized wear sleeve (82a, 82b) so that relative motion occurs at the interface (96a, 96b) between the interior surface (97a, 97b) of each wear sleeve and the exterior surface 99a, 99b of the corresponding bearing 84a, 84b. In another embodiment, each bearing includes a flange (85) that seats against the bellcrank (54) to guard against dirt contamination of the relative motion interfaces.
REFERENCES:
patent: 3251350 (1966-05-01), Thompson
patent: 3315537 (1967-04-01), Keller
patent: 3712278 (1973-01-01), Kuhn
patent: 4827713 (1989-05-01), Peterson et al.
patent: 4878767 (1989-11-01), Halder
patent: 5433178 (1995-07-01), Urmaza
Baran Kenneth C.
Battista Mary Ann
United Technologies Corporation
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