Power Jacks' S-Series metric cubic screw jacks offer higher duty cycle
and better mounting flexibility compared with conventional worm gear
screw jacks. The higher duty cycle of the S-Series has been achieved by
improving the thermal efficiency of the gearbox. The cubic shape and
finned sections of the gearbox housing allows better heat dissipation,
while its higher mass increases thermal capacity. Maintaining full
lubricant contact with the gear teeth also reduces wear and aids cooling.
Achieving a balance between surface area and mass is actually quite
critical, as both have an impact on thermal performance. The results of
tests show that S-Series screw jacks offer 50% higher duty cycle than
conventional worm gear screw jacks, irrespective of the lifting screw
efficiency.
Three standard gear ratios are available, with two different lifting
screw leads - combinations of which provide a multitude of linear travel
rates in translating or rotating screw form. A range of standard motor
adaptors can be bolted directly to the gearbox housing.