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Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the "size of the worm wheel - to - 1". Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio.
The slewing drive is a modernized take on the worm drive mechanism, which dates back many centuries and was widely used during the Renaissance Era. Pappus of Alexandria (3rd century AD), a Greek mathematician, is credited with an early version of the endless screw, which would later evolve into the worm drive. [1]
The concept commuter vehicle housed six 12-volt lead–acid batteries in the trunk area and a transverse-mounted DC electric motor turning a front-wheel drive trans-axle. The gasoline-powered engine was connected to the trans-axle via a worm gear. [10] The car could be plugged into a standard 110 Volt AC outlet for recharging.
A hydraulic power steering system was available as an option for the worm type steering gear. [21] The 12-volt electrical system was fed by two 135-Ah batteries. Power can be switched off using a manually operated circuit breaker controlled from the cabin. [21]
Ignition – Delco, 12 volt, 2 spark; ... Steering Gear – Worm and gear; Standard equipment ... Everyman’s Guide to Motor Efficiency. New York: Leslie-Judge Company.
The motor speed varies as a non-linear function of load torque and armature current; current is common to both the stator and rotor yielding current squared (I^2) behavior [citation needed]. A series motor has very high starting torque and is commonly used for starting high inertia loads, such as trains, elevators or hoists. [2]
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