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Cool actuator compensates for extreme temperatures
Rodless cylinders have proven to be one of the most popular and reliable ways of providing linear motion, and as such there are many engineers wishing to use them in somewhat unusual circumstances. One such application is bus, tram and train doors, which can be exposed to tremendous temperature variations.
To meet these needs, Hoerbiger-Origa now has extended its range to offer temperature compensation. The new units are based on the proven Origa OSPP range, and are available in the standard sizes of 25mm, 32mm, 40mm and 80mm bore. They include a sliding seal arrangement so that the air-driven piston can be connected directly to the load. Automatic temperature compensation is provided to the inner band of the seal so that it adjusts for thermal expansion and contraction, while maintaining an airtight seal.
As with all Hoerbiger-Origa actuators the external dimensions are absolutely standardised, so that they can be swapped out simply by undoing the mounting bolts, they are maintenance free and can be used as structural elements within their application.
The temperature compensating actuators have a total range of -40deg C to +120degC, although special seals are required for duties below -10degC or above +80degC. Significantly the highest performing seals Hoerbiger-Origa is able to offer work across a 160 Kelvin temperature difference, although in such cases the effective stroke length may have to be limited.
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