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 |
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.
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