The structural design and operation principle of rotary hydraulic cylinder are introduced.Using Pro/E software

double-helix transmission model for 60°

50°

40°and 30° thread angle are established.through the interface module Mechanism/Pro of Pro/E and ADAMS which defines rigid bodies

double-helix transmission model is introduced into ADAMS in which complex constraints and forces are added

Dynamics property of double-helix transmission are solved.Rotate process of Rotary hydraulic cylinder are simulated.The results show that double-helix transmission is reliable and no interference

dynamic response of double-helix transmission for 50° thread angle is the most sensitive

double-helix transmission for 60° thread angle is the most steady.