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Budget approach to high-reduction-ratio gearboxes
Drive Lines Technologies has successfully designed planetary gearboxes with reduction ratios up to 7000:1 using basically standard components to minimise cost.
Drive Lines Technologies has successfully designed planetary gearboxes with reduction ratios up to 7000:1 using basically standard components to minimise cost.
In one particular application, the direction of rotation was one-way and gearbox backlash was not a significant factor.
A high-pressure slurry jet nozzle, cutting a 600mm-diameter hole in 60mm-thick steel plate, was required to rotate through a full revolution in around 4 hours.
The selected hydraulic motor produced 7200 revolutions in the 4-hour period.
Combining two virtually standard IMS planetary gearboxes, with ratios of 308:1 and 22:1, provided an overall reduction ratio of just under 6800:1.
The resulting nozzle rotation speed was 0.026rev/h - or one revolution every 3.75 hours.
Six systems have been supplied.
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