US 11,851,158 B2
Variable pitch fan assembly with remote counterweights
Daniel A. Niergarth, Everdale, OH (US)
Assigned to General Electric Company, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Nov. 21, 2022, as Appl. No. 17/991,302.
Application 17/991,302 is a division of application No. 17/222,771, filed on Apr. 5, 2021, granted, now 11,505,306.
Prior Publication US 2023/0085208 A1, Mar. 16, 2023
Int. Cl. B64C 11/32 (2006.01); F04D 29/32 (2006.01); F01D 7/00 (2006.01); B64C 11/34 (2006.01)
CPC B64C 11/32 (2013.01) [B64C 11/346 (2013.01); F01D 7/00 (2013.01); F04D 29/323 (2013.01); F05D 2220/36 (2013.01); F05D 2260/74 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A variable pitch fan assembly comprising:
a plurality of trunnions, each trunnion having a first trunnion gear surface;
a plurality of counterweight assemblies each comprising a counterweight, a counterweight shaft, a first counterweight gear having a first counterweight gear surface, and a second counterweight gear having a second counterweight gear surface;
a first unison ring gear with a first gear surface engaged with the first trunnion gear surfaces and a second gear surface engaged with the first counterweight gear surfaces; and
a second unison ring gear with a third gear surface engaged with the second counterweight gear surfaces,
wherein the second unison ring gear does not axially overlap with the first unison ring gear.