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E-scooter

Electric-powered stand-up scooter

  • 9 min read
  • 5 chapters
Xiaomi M365 blanche
Axel.206 · CC0

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Through Tire, Electric motor and Gear

The first motorized scooter was manufactured by Autoped in 1915. Since 2017, e-scooters have grown in popularity with the introduction of scooter-sharing systems that use apps to allow users to rent them by the minute. Such systems now are in selected major and midsize cities worldwide.

Parts and other features

Parts of an electric scooter include the deck, stem, handlebars, tires, suspension, lights, batteries, brakes, controller and motor.

E-scooters usually have two wheels between 8 and 11 inches (20–28 cm) in diameter, connected by a platform on which the rider stands, with a handlebar for support and steering.

There are three types of tires:

  • Pneumatic (air-filled) tires.
  • Solid tires.
  • Hollow tires are made of durable rubber.

It is propelled by an electric motor, which makes gears unnecessary. It may support energy recovery by regenerative braking.

Range and speed vary considerably according to model. One reference shows ranges of 9 to 200 km (6 to 124 mi), and maximum speeds from 14 to 160 km/h (9 to 99 mph).

Wheels and tires

Stand-up scooters may have solid tires, pneumatic tires with tubes, or tubeless pneumatic tires. Pneumatic tires offer benefits such as better shock absorption, adjustable tire pressure, and easier changes; however, they are prone to flats and require regular maintenance, making them ideal primarily for flat surfaces. Solid tires, often honeycomb in structure, have advantages such as a longer lifespan, puncture resistance, and low maintenance needs. However, they tend to have heavier weight and less shock absorption compared to air-filled tires. Sizes vary between 8 inches (200 mm) and 11 inches (280 mm) usually, and scooters with larger are available, for both road and off-road use. There are some with unusually wide tires especially for off-road use. Most of them use a steel or aluminum split rim.

Drive and transmissions

The simplest drive mechanism of stand-up scooters is the electric direct drive, where the motor directly drives the rear wheel. Some electric scooters have four motors, two in each wheel. Brushless motors can be extremely efficient this way, especially when regenerative braking is implemented. A large proportion of newer so-called "e-scooters" are designed this way.

When electric direct drive is not the rule, the simplest is the spindle drive, which puts an extension of the engine's output shaft, the spindle, in direct contact with the scooter's rear tire. To work correctly, the tire must have a clean, dry surface with which the spindle can effectively interact. Scooters with this type of direct transmission can be pull-started with the rear wheel off the ground, or "bump"-started by forcefully pushing them with the rear tire in contact with the ground.

Simple chain reduction drives are also used to transfer energy to the rear wheel, generally incorporating a type of centrifugal clutch to allow the engine to idle independently.

Belt reduction drives use the combination of wide flat "cog" belts and pulleys to transfer power to the rear wheel. Like chain drives, belt drives include a centrifugal clutch, but are more susceptible to breakage in off-road conditions.

Suspension

The suspension systems of stand-up scooters range from nothing at all, to simplistic spring based fork systems, to the complicated, dampened cam-link and C.I.D.L.I (Cantilevered Independent Dynamic Linkless Indespension) suspension mechanisms or a hybrid combination of wooden deck, coil spring, air spring and dampers.

Brakes

Brake systems of kick scooters include disc brakes; magnetic brakes; and less efficient hydraulic brakes. Brakes can be placed on the front and/or back wheel(s). Some scooters have two sets of brakes on each wheel, one on each side. Many newer e-scooter models also have kinetic energy recovery system (KERS), which also acts as an electronic ABS system (E-ABS) on some models.

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