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Strictly speaking, a shaft that rotates with the wheel, being either bolted or splined in fixed relation to it, is called an axle or axle shaft.

On cars and trucks, several senses of the word axle occur in casual usage, referring to the shaft itself, its housing, or simply any transverse pair of wheels. Sometimes, especially on bicycles, the latter type of axle is referred to as a spindle. In the latter case, a bearing or bushing sits inside a central hole in the wheel to allow the wheel or gear to rotate around the axle. In the former case, bearings or bushings are provided at the mounting points where the axle is supported. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. A Denney axleĪn axle or axletree is a central shaft for a rotating wheel or gear.

Railroad car wheels affixed to a straight axle, limiting them to rotate in unison. JSTOR ( August 2018) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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