US 12,420,913 B2
Hydraulic drag brake
Darrell E. Ankney, Dixon, IL (US); and Ryan Sievert, Janesville, WI (US)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Feb. 2, 2024, as Appl. No. 18/431,859.
Prior Publication US 2025/0250000 A1, Aug. 7, 2025
Int. Cl. B64C 13/36 (2006.01); B64C 9/32 (2006.01)
CPC B64C 13/36 (2013.01) [B64C 9/323 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hydraulic drag brake for use with a driveline, the hydraulic drag brake comprising:
a fluid circuit comprising first and second loops;
a first valve disposed along the first loop to allow a flow of fluid through the first loop in a first direction and to prevent a flow of the fluid through the first loop in a second direction;
a second valve disposed along the second loop; and
a pump coupled to the driveline and configured to pump the fluid through the fluid circuit in the first direction and across the first valve with the driveline occupying a retracted position or engaging in an extend motion and in the second direction and over the second valve with the driveline occupying an extended position.