Helac - Model L20 -Rotary Actuators

Helac`s innovative sliding-spline technology converts linear piston motion into powerful shaft rotation. Each actuator is comprised of a housing and two moving parts — the central shaft and piston. Helical spline teeth on the shaft engage matching teeth on the piston`s inside diameter. A second set of helical splines on the piston`s outside diameter mesh with the gear in the housing.

Starting Position
The piston is completely bottomed out. Bars indicate starting positions of piston and shaft. The housing with integral gear remains stationary.

Ending Position
When hydraulic pressure is applied to the piston, it moves axially; while the helical gearing causes the piston and shaft to rotate simultaneously. Applying pressure to the opposite port will return the piston and shaft to their original starting positions.