wheelaxle

The term wheelaxle is used in engineering to describe a unit consisting of a wheel mounted on an axle. In simple machine analysis, a wheel-axle arrangement reduces friction when moving loads and can provide a mechanical advantage equal to the ratio of wheel radius to axle radius.

The axle serves as a rotation axis for the wheel, and also carries the vehicle’s or machine’s load. The wheel hub connects to the axle and carries the tire and brake components. The assembly allows torque transmission from an engine or motor to the wheel.

Key components include the wheel (rim, tire, hub), the axle (solid shaft or hollow spindle), bearings (ball or roller), seals, hub, brake components, and attachment points to suspension or chassis.

In automotive use, wheel-axle assemblies may be part of a rigid or live axle in which the axle also transmits drive torque to wheels, or may be part of an independent suspension with separate axles for each wheel. In bicycles, the concept appears as wheel axles with through-axles or quick-release interfaces. In machines, wheel-axle assemblies are common in pulley systems and small wheels.

Regular inspection focuses on bearing wear, seal integrity, and hub play. Common issues include worn bearings, bent axles, or damaged hubs which can lead to excessive play, vibration, or loss of steering control.

See also: wheel, axle, hub, bearing, simple machine.