US 12,072,010 B2
Strain wave gearing
Karl Potier, Aix en Provence (FR); and Corentin Boitard, Maisons-Laffitte (FR)
Assigned to GOODRICH ACTUATION SYSTEMS SAS, Saint-Marcel (FR)
Filed by Goodrich Actuation Systems SAS, Vernon (FR)
Filed on Jun. 9, 2023, as Appl. No. 18/332,282.
Claims priority of application No. 22305892 (EP), filed on Jun. 20, 2022.
Prior Publication US 2023/0407956 A1, Dec. 21, 2023
Int. Cl. F16H 49/00 (2006.01); B64C 13/50 (2006.01); F16H 19/08 (2006.01)
CPC F16H 49/001 (2013.01) [B64C 13/50 (2013.01); F16H 19/08 (2013.01); F16H 2049/003 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A strain wave gear mechanism comprising:
a casing;
an elliptical drive shaft;
an outer ring arranged coaxially around the elliptical drive shaft and rotationally fixed to the casing, the outer ring having a toothed inner circumference; and
a flexible ring mounted around the elliptical drive shaft radially inwards of the outer ring, the flexible ring having a toothed outer circumference,
wherein rotation of the elliptical drive shaft causes elliptical rotation of the flexible ring relative to the outer ring such that teeth of the flexible ring engage with teeth of the outer ring at points corresponding to the major axis of the ellipse of the drive shaft to cause movement of the flexible ring in a direction opposite to rotation of the drive shaft;
wherein the outer ring is rotationally fixed to the casing via a solenoid operated disconnect gear configured to selectively disconnect the outer ring from the casing to permit reverse operation of the strain wave gear mechanism.