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Gear reducer promises high-efficiency performance

A Servotechnic product story
Edited by the Engineeringtalk editorial team Oct 9, 2006

The Standard Nabtesco i-line RV-E gear reducer provides high-end performance in a very compact and highly rigid component type configuration.

The Standard Nabtesco i-line RV-E gear reducer, available from Servotechnic, provides high-end performance in a very compact and highly rigid component type configuration.

The unit incorporates rolling contact elements to provide high efficiency and long life, integrated angular bearings to support external loads and a two-stage reduction design to reduce vibration and inertia while increasing ratio capabilities.

The Nabtesco Precision reducer consists of a patented two-stage cycloidal design that provides large torque, high-ratio and significant shock-load capabilities with extreme precision and excellent quality.

The RV uses rolling contact elements to reduce wear, extend life and lower backlash with the unique pin and gear structure of the cycloidal design providing higher shock resistance than traditional reducers and further reducing backlash.

The reducer also incorporates a set of large, internal angular support bearings that provide large moment capacities and negate the need for external support devices.

The virtually symmetrical gear design and the support of all shafts by roller bearings guarantee a constant performance during the lifetime and allow short time peak loads of up to 5x the given rated torque (ie for emergency stops).

Integrated angular support bearings increase reducer rigidity as well as provide the reducer with the ability to support large external moments, thus eliminating the need for external support devices, reducing the number of components required and increasing reliability and reducing overall cost.

100% continuous contact of the cycloidal pin and gear teeth design provides high shock load capacity and very low backlash since forces are distributed throughout the reducer.

The patented two-stage reduction mechanism reduces vibration due to the lower speed rotation of the two cycloidal gears while the reduced input coupling size lowers inertia.

A wide variety of ratios are possible by simply changing the first stage spur gear combinations.

The use of rolling contact elements throughout the reducer helps to provide an excellent starting efficiency; low wear with long life expectancy, and low backlash.

The angular transmission accuracy between the input and output shaft is described by the transmission error which is less than 1arc-min.

Hysteresis loss is a mere 1arc-min.

With the input gear fixed, the rated torque is applied to the output shaft in both directions and the elasticity is measured.

At zero load (dead centre), the distance delta-phi between upper and lower boundary of the hysteresis area is 1arc-min maximum.

Applications for the RV-E gear reducer include machine tools, tool changers, robots and wind turbines.

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