US 11,933,229 B2
Speed reduction gear for an aircraft turbomachine
Patrice Julien Ptaszynski, Moissy Cramayal (FR); Antoine Jacques Marie Pennacino, Moissy Cramayal (FR); and Boris Pierre Marcel Morelli, Moissy Cramayal (FR)
Assigned to SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed by SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed on Feb. 6, 2023, as Appl. No. 18/165,173.
Claims priority of application No. 2201069 (FR), filed on Feb. 8, 2022.
Prior Publication US 2023/0250761 A1, Aug. 10, 2023
Int. Cl. F16H 57/08 (2006.01); F02C 7/36 (2006.01)
CPC F02C 7/36 (2013.01) [F16H 57/082 (2013.01); F05D 2220/323 (2013.01); F05D 2250/75 (2013.01); F05D 2260/40311 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A speed reduction gear for an aircraft turbomachine, this reduction gear having a main axis and comprising:
a planet carrier comprising a cage and a cage carrier,
a sun gear located in the cage and centred on the main axis,
planet gears arranged around the main axis and the sun gear and meshed with the sun gear,
a ring gear arranged around the axis and the cage and meshed with the planet gears,
one element selected from the cage and the cage carrier comprising an annular row of axial fingers disposed about the main axis, and the other of these elements comprising an annular row of axial housings in which the fingers are mounted, each of the housings being delimited by two bridges, respectively radially inner and outer, which comprise radial orifices aligned with a radial orifice of the finger inserted between these bridges, the orifices of the bridges and of the finger being traversed by a spindle oriented along a radial axis, each of the spindles comprising a radially outer segment extending into the orifice of the outer bridge an intermediate segment extending into the orifice of the finger, and a radially inner segment extending into the orifice of the inner bridge
wherein:
at least one of the bridges of each of the housings comprises at least one first circumferential zone extending around the radial axis, which comprises at least one recess, and at least one second circumferential zone around the radial axis, which is devoid of recesses, so as to make the at least one of the bridges more flexible, wherein each of said at least one recess extends through the entire thickness of the bridge, and/or
at least one of the outer and inner segments of each of the spindles comprises at least one recess which is centred on the radial axis or extends around that radial axis, and the intermediate segment of each of the spindles is free of such a recess, so as to make the spindle more flexible.