US 12,214,893 B2
Air inlet for an aircraft propulsion unit comprising a member for moving a movable upstream portion and method for using such an air inlet
Hazem Kioua, Moissy-Cramayel (FR); Thomas Marlay, Moissy-Cramayel (FR); Damien Lemoine, Moissy-Cramayel (FR); and Ophélie Schmitter, Moissy-Cramayel (FR)
Assigned to SAFRAN NACELLES, Gonfreville-l'Orcher (FR)
Appl. No. 18/258,319
Filed by SAFRAN NACELLES, Gonfreville-l'Orcher (FR)
PCT Filed Dec. 21, 2021, PCT No. PCT/EP2021/086996
§ 371(c)(1), (2) Date Jun. 19, 2023,
PCT Pub. No. WO2022/144236, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 2014186 (FR), filed on Dec. 28, 2020.
Prior Publication US 2024/0294265 A1, Sep. 5, 2024
Int. Cl. F01D 17/00 (2006.01); B64D 33/02 (2006.01)
CPC B64D 33/02 (2013.01) [F01D 17/00 (2013.01); F05D 2260/53 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An air inlet for an aircraft propulsion assembly, said aircraft propulsion assembly extending along a longitudinal axis oriented from upstream to downstream and comprising a turbomachine configured to allow propulsion of the aircraft from an internal air flow acceleration that is circulating from upstream to downstream in the turbomachine, said air inlet circumferentially extending about the longitudinal axis and comprising a movable upstream part, a fixed downstream part and at least one moving member configured to translationally move the movable upstream part with respect to the fixed downstream part, said movable upstream part comprising:
an upstream internal wall pointing towards the longitudinal axis and configured to guide the internal air flow,
an upstream external wall, opposite to the upstream internal wall, configured to guide an external air flow, and
an air inlet lip connecting the upstream internal wall and the upstream external wall,
said movable upstream part being movable between a retracted position, in which said movable upstream part is adjacent to the fixed downstream part, and a deployed position, in which said movable upstream part is spaced apart upstream of the fixed downstream part in order to delimit together a through channel for fluidly circulating between the external air flow and the internal air flow,
the at least one moving member comprising:
at least one guide bar connected to said movable upstream part, and
a drive bar comprising a plurality of teeth,
the fixed downstream part comprising, for each moving member:
a toothed wheel configured to be rotatably driven and to cooperate with the teeth of the drive bar so as to form a rack-and-pinion connection for moving the at least one moving member and said movable upstream part,
at least one guide member configured to guide the at least one guide bar when moving the at least one moving member,
wherein the drive bar extends as a downstream extension of the at least one guide bar and comprises an external wall comprising an angular drive portion, where the teeth are mounted, and an angular guide portion,
wherein the at least one guide member is a downstream guide member configured to successively guide the at least one guide bar and the angular guide portion of the drive bar, and
wherein the angular drive portion comprises a recessed zone in which the teeth are mounted.