Products Clutches, brakes & couplings An elastomeric
coupling range Aimed at general purpose applica- tions, Huco Dynatork's L-Jaw elastomeric couplings are said to be easy to install and require no lubrication or maintenance. The couplings are suitable for light and medium duty industrial applications where the take-up of vibration is an important factor. They are available in models with torque capacities up to 0.70kNm. Fully interchangeable with industry-standard designs, these offer the flexibility and resilience of a polyurethane element, of which four types are available – Buna-N rubber, Urethane, Hytrel and bronze. Huco Dynatork
www.huco.com
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Centrifugal backstop for high speed shafts
New from Stieber Clutch is the RSRT, a centrifugal lift off sprag type backstop with an integral torque limiter and release-under-load function. This has been developed for use on the high speed or inter- mediate shaft of the driving machines in multi-drive systems, such as on large inclined conveyors, where two or more backstops share the reverse load. In the event of a blockage, belt jam or overload, the stored energy is released in a controlled manner. The mechanical release function allows the tension of a jammed belt to be released through an internal hydraulic system – a simple hand pump is used to actuate the hydraulic cylinder, progressively releasing the back- stop. When the oil pressure is released, the backstop is automatically re-set to the original slipping torque. The operation can be controlled and halted at any time. Where multiple backstops are employed, these can be linked and operated simultaneously from a centralised control location. To allow the unit to be released under torque, the complete backstop must be able to rotate backwards, from as little as a fraction of a rotation to as much as several rotations. This is enabled through bearing support of the outer race. The friction linings of the backstop are lubricated throughout; and the contacts between linings and pressure plates are not affected by contact corrosion or oil contamination. By employing load sharing backstops, users can select smaller backstops than would otherwise be required to cover belt jams or conveyor overloads, with the selection based on the actual load and not on the motor stall torque. RS standard models are available up to 300,000Nm hold torque, but customised versions can also be provided. Stieber
T: +49 6221 3047 32
www.stieber.de Enter 222
Disc pack coupling
range extended The performance range of Mayr Power Transmissions’ ROBA-DS disk pack couplings has been extended to cover a nominal torque range of 22,000Nm to 110,000Nm.
The flexible disk pack is coupled via a new cone connection to the transmis- sions hubs which is both backlash free and reduces the screw tightening torques. In addition, installation and de- installation can be carried out quickly without displacement of the hubs. Features of the couplings include high torque density, insensitivity to extremes of temperature, and they are both torsionally rigid and maintenance free. They also transmit torque backlash free, without wear, and compensate for shaft misalignments. Double jointed couplings can be manufactured with custom spacers to cope with different DBSE’s as required.
When tightening, the cone shaped mounting parts create expansion forces which expand the parts radially, within elastic limits, resulting in a backlash free connection of the disk pack. Mayr Transmissions Enter 223 T: 01535 663900
www.mayr.co.uk
A depth of technical expertise and engineering experience, specialising in the design, manufacture and supply of high performance mechanical power transmission systems and components.
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