Power Jacks Rolaram Linear Actuators - Manual (Page 8)

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LINEAR ACTUATORS | Rolaram
4. Rolaram® Linear Actuator Range
There are 8 standard Rolaram models, available in 2 standard drive configurations, each with 10 linear speeds and offering a wide range of
load capabilities. The R050, R075, R100 and R125 models are available in a Ball Screw version, for applications where positional accuracy is
less important and a more cost effective solution is desired.
Where the standard range does not meet the application specification, special actuators can be designed to meet customers’ specific
requirements (refer page 9).
Dynamic Load Capacity and Linear Speed
Dynamic load capacity from 4 kN to 400 kN (0.4 to 40 tonnes). A wide choice of linear speeds is available, from less than 250 mm/ minute to
7000 mm/minute. The speed range is achieved by using a combination of gearbox ratios, screw leads and standard motor speeds. The load/
speed curves below illustrate by model how the dynamic load capacity varies with linear speed.
Load/Speed Curves
Drive
The drive is a standard 415v 3ph AC brake motor, mounted either at right angles or parallel to the actuator ram. The motor is fitted with a
brake as standard, to insure that despite the high efficiency screw and gear system, the actuator is self sustaining and will not back drive.
High efficiency helical spur and spiral bevel gearing are used to achieve the choice of reduction ratios and the option of a right angle or
parallel drive.
Stroke
Each model can be provided with a stroke length up to the maximum shown in the Technical Charts. Please note that these strokes allow
for the maximum dynamic load in compression. For a tensile load, greater maximum strokes can be accommodated depending on the
linear speed. Where the stroke required exceeds the maximum shown, or there is a high static load, please contact our Technical Sales
Department.
Standard Features
• Right angle or parallel drive configurations
• Choice of end fittings - clevis, screwed end, top plate
• Trunnion mounting (with or without feet)
• Rear Clevis
• Proximity switches, encoder
• Ball screw version for R075, R100 and R125 models
• Guided ram
400 R250
350
300
R225
250
200 R175
150
R150
100
50
R125
B125
R100
B100
R075
B075
B050
0 1 2 3 4 5 6 7 8 9
Dynamic Load
Capacity
(kN)
Linear Speed
(x 103 mm/min)