Air inlet for an aircraft propulsion unit comprising a member for moving a movable upstream portion and method for using such an air inlet

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 the acceleration of an internal air flow 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 and 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, and
• at least one guide member configured to guide the at least one guide bar when moving the at least one moving member.

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 by accelerating internal air flow 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 a moving member configured to translationally move the movable upstream relative to the fixed downstream part, wherein:

• said movable upstream part comprising:
• an upstream internal wall facing the longitudinal axis and configured to guide the internal air flow;
• an upstream external opposite to the upstream internal wall and configured to guide an external air flow;
• an air inlet lip connecting the upstream internal wall and the upstream external wall;
• and
• wherein said movable upstream part has 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 from the fixed downstream part and a through channel is provided for circulating between the external air flow and the internal air flow;
• said moving member comprising:
• a guide bar connected to said movable upstream part;
• and
• a drive bar comprising a row of teeth,
• said fixed downstream part comprising:
• a toothed wheel cooperatively coupled with the row of teeth of the drive bar so as to form a rack-and-pinion connection for moving the moving member and the movable upstream part, and
• at a guide member configured to guide the guide bar when moving the moving member.