In applications the main aim is to transmit torque gears usually rotate unidirectional whereas in applications where main aim is to transmit motion gears usually rotate bidirectional. In both cases, even if rotates unidirectional or bidirectional, a certain amount of space (free angular movement usually called “backlash”) between meshing teeth flanks are allowed for functional reasons. Backlash is a requirement for efficient performance of a gear pair when lubrication, manufacturing, and assembly errors, heating of the gearbox elements are taken into consideration. However, optimum/correct value of the required backlash is not well defined and calculated before the actual gear pairs are put into operation. Therefore, usually grater backlash than required is used to prevent any likely back surface rubbing. This additional backlash, however, causes unwanted “lost motion” phenomenon when motion reverses. &nbsp;Researchers and engineers who study on power transmission field, mechanical design, and controlling field have been focused to backlash by investigating its influence onto gear behavior, predict, remove, minimize, and optimize.In first paper of series of papers, range of backlash prediction have been investigated both their own effects and their integration effects via combinations. In the second paper, backlash predictions by the in-house prepared software including specific manufacturing and assembly errors have been validated both numerically and experimentally. Two well-known commercial software were used for numerical validation of the predictions whereas a special test rig was designed &amp; constructed for experimental measurements .In the present paper, backlash can be minimized by using ideal phasing compensating methodology for gears with marked numbers. If selected number of teeth of gears are relatively prime hunting tooth meshing is completed under each tooth contacts via each tooth. In this approach, probabilities of minimum backlash configurations have been performed creating adjacent pitch deviation document which is effectful parameter based on manufacturing reports approximately. Thus, how backlash is minimum could via certain configurations between gears have been evaluate using phasing methodology under defined contact teeth which are provides minimum backlash chance.Software can perform prediction, minimizing and selection of proper couple. User friendly software have been developed to guide assembly personnel/staff to create a combination of different gearbox components from the measurement data bank to obtain a specified backlash range for gear pair. As an alternative to design process, the gearbox components manufactured (by not very tight tolerances) and measured could be classified and grouped into different assembly subgroups for minimum/targeted backlash condition. This condition will also avoid any slowing of manufacturing and helping to increase production capacity.&nbsp;

The Self-Compensation Approach for Backlash on Gear Pair

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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