Motorised Torque Arm Meets AGMA Standard

Baldor Electric has announced that a motorised version of the Dodge torque arm shaft-mounted speed reducer will be making its European debut at Hillhead 2010. The Dodge Motorized Torque-Arm II (MTA) shaft-mounted speed reducer is a right-angle gearbox with an IEC flanged motor interface, specified for use with two-pole or four-pole motors.

A choice of 12 helical gear-reduction ratios and three case sizes allow the unit to deliver a wide range of speed reductions from 18:1 to 75:1 for class 2 applications from 1.5 to 55kW, with efficiencies up to 95 per cent. The MTA has been optimised for robustness and has been developed in accordance with European design practices. The reducer is rated to meet the 6010 AGMA (American Gear Manufacturers Association) standard.

This specifies a 5,000-hour bearing life, approximately twice as long as comparable DIN design specifications. Other reliability features include the use of heavy-duty tapered roller bearings instead of ball bearings and an input pinion shaft with straddle-mounted bearings on both the motor and gearing sides. This latter construction combats any overhang stress resulting from a poorly mounted motor and allows the gearbox to be offered in a sealed form that protects the gears against any contaminants during installation or maintenance operations at the motor input.

Premium HNBR (hydrogenated butadene nitrile rubber) seals are fitted as standard for extra protection and the MTA is designed to be used with Dodge twin-tapered bushings, which provides a sturdy, concentric grip of the driven shaft on both sides of the reducer. This eliminates the wobble and fretting corrosion normally associated with single-bushed shaft-mounted reducers. 'This AGMA-rated right-angle motorised torque arm reducer provides an alternative to conventional gearboxes wherever space is at a premium and robustness is critical,' said Charles Gubser of Baldor Electric.

'We expect it to be of interest to OEMs in machinery sectors including conveyors and mixing and milling equipment dealing with harsh materials and in heavy-duty bulk-handling applications,' he added.


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