20mm linear actuator handles two tonne loads

Hoerbiger-Origa 20mm BHD linear actuator housed in a high-strength, one-piece aluminium extrusion.

Hoerbiger-Origa has extended its BHD series of modular belt-driven linear actuators for heavy-duty applications with the addition of a small size 20mm unit.

Developed to offer the advantages of a sealed mechanism and fit-and-forget installation, the BHD incorporates a precision recirculating ball bearing rail that gives it a load bearing capacity up to two tonnes - making it suitable for the most demanding of applications.

The decision to develop a heavy-duty BHD was based on the observation that users increasingly have high load requirements in tight space envelopes.

Hoerbiger-Origa's development team retained the fundamental concept of its linear actuator range, in developing a new compact low-profile device, housed in a high strength one-piece aluminium extrusion.

The early success of the original size 25, 32 and 50 versions prompted the launch of an extremely compact size 20 version to round out the series and cater for high cycle and duty applications typically found on assembly lines and packaging machines.

The low profile is achieved by mounting the belt pulleys with vertical axes rather than horizontal, so that the two runs of the belt loop are side-by-side instead of one above the other.

The extruded housing is strong enough to be used as a structural machine element in many applications absorbing any static loads present, including side and bending forces.

The dynamic load being moved by the actuator is carried entirely by the recirculating ball bearing rail for low friction, and high dynamic performance.

A stainless steel sliding seal is mounted in the housing to ensure that the belt mechanism is fully protected from ingress of dirt and oil.

Modular mounting options and dovetail slots for adding sensors and other ancillary equipment are also encompassed within the profile of the housing.

The belt is made from a high-performance polyurethane re-inforced with stainless steel, being supplied in 16, 20, 25 or 40mm widths depending on the size of the BHD unit.

The belt requires no maintenance or adjustment throughout its service life, which is measured in years for most applications.

BHD can run at speeds of up to 5m/s, fast enough for 95% of all application requirements and probably more that adequate considering the loads it is likely to be used with.

Acceleration capabilities are up to 30m/s/s, which is high so that cycle times on short stroke applications can be reduced.

Stroke length is infinitely variable up to 6m.

The decision to develop this long stroke capability was based Hoerbiger-Origa's experience in linear motion engineering which suggests that large loads sometimes need to be transported considerable distances.

Stroke lengths above 6m are also available, to special order.

In keeping with the modular concept of the BHD range, various drive and motor control packages are available to suit the specific requirements of the users application.

(including stepper, servo and induction types).

Further available options include integral gearboxes, bi-parting carriages and inter-connection mountings for multi-axis applications.

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