US 12,012,976 B2
Multi-axis rotary piston actuator
Kamran Eftekhari Shahroudi, Fort Collins, CO (US); Larry Snyder, Golden, CO (US); and Robert Alan Gerhart, Maple Grove, MN (US)
Assigned to Woodward, Inc., Fort Collins, CO (US)
Filed by Woodward, Inc., Fort Collins, CO (US)
Filed on Mar. 16, 2022, as Appl. No. 17/655,145.
Application 17/655,145 is a continuation of application No. 16/791,668, filed on Feb. 14, 2020, granted, now 11,280,356.
Application 16/791,668 is a continuation of application No. 15/669,314, filed on Aug. 4, 2017, granted, now 10,655,303, issued on May 19, 2020.
Claims priority of provisional application 62/449,879, filed on Jan. 24, 2017.
Claims priority of provisional application 62/371,317, filed on Aug. 5, 2016.
Prior Publication US 2022/0205465 A1, Jun. 30, 2022
Int. Cl. F15B 15/12 (2006.01); E02F 9/00 (2006.01); B25J 9/14 (2006.01); B25J 17/02 (2006.01); E02F 3/36 (2006.01); E02F 9/22 (2006.01)
CPC F15B 15/125 (2013.01) [E02F 9/006 (2013.01); B25J 9/146 (2013.01); B25J 9/148 (2013.01); B25J 17/025 (2013.01); E02F 3/3677 (2013.01); E02F 9/2264 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotary piston actuator assembly comprising:
a first rotary actuator comprising:
a first pressure chamber assembly defining:
a first central bore; and
a first arcuate chamber comprising a first cavity having a first actuator fluid port in fluid communication with the first cavity and the first central bore;
a connector arm;
an arcuate-shaped first piston disposed in said first pressure chamber assembly for reciprocal movement in the first pressure chamber assembly, wherein a first seal, the first cavity, and the arcuate-shaped first piston define a first pressure chamber comprising part or all of the first arcuate chamber, and a first portion of the arcuate-shaped first piston contact is affixed to the rotor connector arm;
an outer housing rotatably surrounding said first pressure chamber assembly and comprising a tubular wall, wherein the connector arm extends to the tubular wall and the connector arm is coupled to the tubular wall; and
a fluid delivery shaft having an elongated body disposed in said first central bore and defining a first shaft fluid delivery path.