Posted to News on 4th Jun 2020, 10:03
BR-HT series: A step forward for back stops
The design of the Tsubaki BR-HT (Back Stop Reducer High Torque) cam clutch means that the inner and outer races are locked together, providing zero back-running in the event of equipment failure. The company states that because the BR-HT series backstop can be directly mounted into machinery, it is well suited to applications where a small installation footprint may be required, for example in industrial gearboxes of the type typically used on inclined conveyors or bucket elevators, pumps and winches.
Tsubaki's BR-HT series is the high-torque version of its predecessor the BR series, which is designed to be fitted directly onto the high-speed shaft of a gear reducer via a standard keywayed shaft. A thicker inner race and robust outer race design ensures the BR-HT series is suitable for heavy duty applications, such as those typically found in the mining and quarrying industries. For improved safety, the backstops feature an anti-rollover cam design which is said to enhance reliability in critical situations.
Sizes range from 20mm to 320mm, with stated torque capacity figures of up to 366,000Nm. A wide range of standard bore sizes are available across the range to maximise availability and shorten lead times for most orders. For specialist application demands, Tsubaki engineers are able to fit the BR-HT series to non-standard shaft sizes by manufacturing special inner races to suit any bore size within the range of the clutch design, or change the design of the inner and outer races to the customer requirements.
The backstops are said to be easy to fit and are largely maintenance free as lubricants already present in the gear reducer can also be used for the lubrication of the BR-HT Cam Clutch backstop. Other applications may only require periodic maintenance and lubrication. Each backstop is supplied with a recommended lubrication regime and can be used in temperatures ranging from -5degC to +40degC. Higher or lower temperatures outside this range can also be accommodated. The BR-HT series "Lift-Off" design is non-frictional when running at operational speeds, so when the clutch is disengaged it is totally free running with no mechanical contact. As such the BR-HT can run indefinitely in "Lift-off" mode with frictional wear only occurring on either start-up or stopping, unlike other backstops which run in constant friction all the time.
For the MRO market, the BR-HT series offers 100 per cent interchangeability with most OE components and reduced Total Cost of Ownership thanks to its long service life. Go to www.tsubaki.co.uk for further details.
