US 11,667,378 B2
Flap drive device and blades of rotary-wing aircraft
Sang Joon Shin, Seoul (KR); Won Jong Eun, Gyeonggi-do (KR); Byeong Uk Im, Seoul (KR); Chang Bae Lee, Seoul (KR); and Jin Wook Shin, Chungcheongbuk-do (KR)
Assigned to SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR)
Filed by SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR)
Filed on May 21, 2021, as Appl. No. 17/327,348.
Claims priority of application No. 10-2020-0061927 (KR), filed on May 22, 2020.
Prior Publication US 2022/0024570 A1, Jan. 27, 2022
Int. Cl. B64C 27/72 (2006.01); B64C 27/615 (2006.01)
CPC B64C 27/72 (2013.01) [B64C 27/615 (2013.01); B64C 2027/7283 (2013.01); B64C 2027/7294 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A flap drive device installed on a blade body of a rotorcraft, the flap drive device comprising:
a drive module;
a flap drive link arm arranged behind the drive module and extending by a length in a front-rear direction; and
a flap module arranged behind the flap drive link arm and capable of performing a pitch movement around a rotation center axis,
wherein the drive module comprises an actuator shaft capable of changing a position thereof in the front-rear direction,
wherein the flap drive link arm comprises a front hinge connection portion provided at a front end of the flap drive link arm and a rear hinge connection portion provided at a rear end of the flap drive link arm,
the front hinge connection portion is pivotably-connected to the actuator shaft to pivot about an axis,
the rear hinge connection portion is pivotably-connected to the flap module;
the flap module comprising:
a flap body;
a rotation center hinge segment at a front end of the flap body; and
a flap pivot hinge segment at the front end of the flap body,
wherein the rotation center hinge segment connects a rotorcraft blade to the flap body,
the flap pivot hinge segment hinge-connects the rear hinge connection portion of the flap drive link arm to the flap body,
the rotation center hinge segment has a first hinge axis on the rotation center axis of the flap module,
the flap pivot hinge segment has a second hinge axis,
the first hinge axis is at a position on a chord line of the flap body, the second hinge axis aligned with the first hinge axis on a line perpendicular to the chord line, and
a center of the first hinge axis and a center of the second hinge axis are apart from each other by a distance,
wherein when a position of the actuator shaft changes in the front-rear direction, the flap module performs the pitch movement around the rotation center axis.