Product category:
Valve positioners and actuators
News Release from: SKF UK | Subject: CRAB
Edited by the Processingtalk Editorial
Team on 30 November 2004
Rotary actuators: flexible design + cost
reduction
Specifiers and users of rotary actuators now have access to two new solutions with the recent expansion of the CRAB rotary actuator product portfolio from the Linear Motion Division of SKF
Specifiers and users of rotary actuators now have access to two new solutions with the recent expansion of the CRAB rotary actuator product portfolio from SKF Engineering Products, the Linear Motion Division of SKF Model 05 is designed to provide a compact, low cost solution for applications where dynamic force demands are below 100Nm
This article was originally published on Processingtalk on 1 Aug 2008 at 8.00am (UK)
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Conversely, model 17 is a modular maintenance-free design engineered for high torque, high load environments.
Application potential for both designs is wide and varied.
For example, the CRAB 17 has been adopted by the electricity supply industry.
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Manufactures of high power switching gear are using the actuator to provide the motive power for high reliability, remote controlled motorised switches, which automatically ensure distribution continuity by bypassing line faults.
Model 05 rotary actuators result from the development of new, patented Swedish seat recliner technology, which has been successfully applied in the automotive industry.
Car seat applications demand low cost, high impact strength and easy operation (electric or manual).
Also, for reliability, they require minimum moving parts and a lubricated-for-life design.
To meet this design brief, the 05 actuators comprise two planetary gearboxes, which provide a final gear ratio equal to their difference.
Thus, high ratios can be achieved with a simple design and few moving parts.
As standard, CRAB 05 units feature chrome-plated steel components which suit dry, indoor applications.
However, for more demanding environments, SKF can manufacture customised solutions.
Model 05 actuators are primarily designed for exposure to torque.
Key specifications include: a maximum static output torque 800Nm (flange) and 40Nm (sun gear); maximum dynamic output torque 100Nm; maximum radial force 200N; gear ratio 56:1 or 57:1; and maximum input speed 300rpm.
Operating temperature range is from 5 to 40C.
Moving to the CRAB 17, priorities switch to design flexibility and modularity within a compact, high torque, high load unit.
Regarding flexibility, in addition to a wide choice of standard motors, gears, connectors and output shaft configurations, customers can also opt for bespoke elements such as custom machined outputs.
Model 17 actuators can be used as load-bearing elements of machine designs without the need for additional bearing arrangements.
The aluminium housing is pre-lubricated, sealed-for-life and maintenance-free.
Requiring just four mounting bolts, the actuators can be used in extremes of temperature and humidity.
Specifications include: maximum instantaneous output torque 200Nm; maximum axial load 5,000N; maximum angular speed 180deg/s; and backlash +/-0.25deg.
Operating temperature range is -20 to 60C.
Weight is 3kg. Request a free brochure from SKF UK ...
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