Rotalink introduces three gearbox models

Edited by the Engineeringtalk editorial team Jul 24, 2009

Rotalink has combined spur and planetary gear stages within the industry-standard ovoid gearbox for a potential output torque increase of at least 400 per cent.

The new gearboxes, available in three model sizes, are the result of a design initiative carried out by the Crewkerne-based manufacturer that takes its lead from advances in ultra polymer materials technology and production techniques.

The gearboxes offer a higher power-to-weight ratio, reduced installation volume and quieter operation.

All three new gearbox lines will enable higher torque or reduced gearbox size for existing customer applications and pave the way for next-generation miniature powertrain systems across all industries, according to Rotalink.

The new gearbox ranges are: the 330 series, a form-fit mounting replacement for the conventional 'standard' industrial ovoid gearbox with an improved 13Nm peak holding torque; the 360 series, a slightly larger model with a 28Nm peak torque in a gearbox case that measures 95mm x 60mm x 31.5mm; and the 310 series, Rotalink's smallest ovoid design that mounts within a volume of 45mm x 2mm x 20mm and features a 2.6Nm holding torque for a 10,000-hour life.

A wide range of ratios are available, typically from 24:1 to 3,200:1 depending upon the model size, with maximum output speeds between 300rev/min and 400rev/min.

All include a zinc-plated pressed steel gearbox case and cover with four-point mounting for maximum durability.

Spur gears run on fixed-steel spindles leading to the final planetary output stage with precision ball bearings supporting the stainless-steel output shaft, which is available as a standard flatted design and which can be customised for the application.

For the 310 series, Rotalink offers all spur gear versions and different levels of advanced gear materials, with a choice of plain or ball bearings.

These options de-rate the maximum torque and performance capability but maintain flexibility through the range.

The 330 and 360 series are also available with different levels of gear materials and a choice of bearings.

All gearboxes are designed for fast and straightforward interfacing with Rotalink's range of DC, AC and stepping motors, along with single- and dual-channel feedback encoders that are fitted directly between the motor/gearbox assemblies.

This allows the use of off-the-shelf single-output shaft motors and helps to reduce product costs and development timescales.

Rotalink's holistic approach to miniature power transmission also includes current limiting boards, which are useful in DC motor applications to limit torque, and complete motion controls such as Red Drive, which allows straightforward drive and control with a graphical programming language that requires no previous programming or motion controls knowledge.

Along with special output shafts and wiring/connector options, customised designs from Rotalink can include ancillary products such as output gears, leadscrew output shafts, pulleys, clutches and brakes.