For applications with inflexible torque demand, sometimes designers specify oversized and less efficient gearsets. Other times, manufacturing engineers sacrifice torque in their designs to minimize gearhead size.
To eliminate both of these compromises and make efficient gearboxes with higher torque density, STOBER Drives Inc., Maysville, Ky., recently introduced the PHQ planetary gear unit. It features helical-cut gears (to carry higher loads than spur gears) and four planet gears for output of up to 88,500 in.-lb. from the largest version.
Because the PHQ is part of the company's ServoFit line, it is supplied with a TriAdapt motor coupling, which features a triple-split collet connection. This coupling fits all motor shafts (including IEC, NEMA, and customized geometries) without requiring a key; it allows motor installation in minutes (without special tools) and thermal expansion of the motor shaft, to prevent thrust load on the motor bearings — and extend motor life. The PHQ also includes a motor plate to fit specific motors, toleranced to improve concentricity.
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