Power Jacks Rolaram Linear Actuators - Manual (Page 4)

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LINEAR ACTUATORS | Rolaram
1. Overview of Rolaram® Linear Actuator Range
What is a Rolaram® Linear Actuator?
Rolaram® is an electro-mechanical linear actuator, which consists of either a Spiracon™ planetary roller screw or a ball screw, driven by
an electric motor, through a reduction gearbox. The lead screw converts rotary motion to linear movement. As the screw rotates, the nut
extends and retracts the ram, which is attached to the load.
Nut
Housing
Roller
Load Bearing
Element
Thrust
Bearing
Wiper Seal
Needle Roller Bearing
Spiracon Nut
Parallel Configuration
Helical Spur
Gearbox
Brake Motor
Thrust Bear-
ing Housing
Tapered Roller
Thrust Bearings
Spiracon
Roller Screw
Outer Casing Wiper Seal
Screw Support
Bearing Bearing Support
Inner Ram
Clevis End
The Spiracon™ Roller Screw
This unique patented system consists of a multi-start screw with
an involute thread form and a number of planetary rollers with
annular grooves, which engage with the screw. These rollers also
engage with a grooved load bearing element, which transmits the
load through roller thrust bearings, to the nut housing. The rolling
action results in a high efficiency mechanism, while the line contact
and hardened and ground construction achieves a high dynamic load
carrying capacity, along with almost no axial backlash or wear.