| Abstract: | A harmonic drive assembly and fluid-powered linear motors with both axial
pistons are rotary piston arrangements incorporating the harmonic drive
assembly are disclosed. The motors may be used in downhole drilling
applications, but the drive assembly and/or motors may be used in other
applications. The assembly, motors and methods use advanced harmonic
drives, advanced helical drives, and combinations thereof with 1) motors
with axial pistons and reciprocating linear rings to convert
reciprocative axial motion to continuous rotary motion, and 2) motors
with rotary pistons and reciprocating linear rings to rectify
reciprocative rotary motion to continual rotary motion to improve
performance over prior configurations. |