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C = number of steered wheels - = separates axle groups and/or different axle functions (6x4-2 is 6x6 with undriven rear axle) Basis is always the standard configuration, meaning a steered front axle and a non-steered driven rear axle. This means: If only the front wheels are steered, the rearmost part of the formula can be left out.
The one-wheeled Chinese wheelbarrow, from Zhang Zeduan's (1085–1145) painting Along the River During Qingming Festival, Song dynasty. Further annotations of the text by Pei Songzhi (430 AD) described the design in detail as a large single central wheel and axle around which a wooden frame was constructed in representation of an ox. [7]
The normal force between the 4 wheels and axles is the same (in total) 981 N. Assume, for wood, μ = 0.25, and say the wheel diameter is 1000 mm and axle diameter is 50 mm. So while the object still moves 10 m the sliding frictional surfaces only slide over each other a distance of 0.5 m.
Shafts have a diameter of 6 mm, and have a groove along the shaft. Gears or other wheels have a bevel on either side of the hub of the wheel. A special sheet metal angle fits into this chamfer, and when the wheel is mounted on an axle, this sheet metal angle will fit into the groove on the axle.
Built to Young's design, the handcarts resembled a large wheelbarrow, with two wheels. They were five feet (1.5 metres) in diameter and a single axle four and a half feet (1.4 m) wide, and weighing 60 pounds (27 kg). Running along each side of the bed were seven-foot (2.1 m) pull shafts ending with a three-foot (0.9 m) crossbar at the front.
Another setup option of staggered wheel fitment is called double staggered, having smaller diameter narrow width wheels in the front with larger diameter and wider width wheel in the back. For example, a vehicle may feature 18 in × 8 in (460 mm × 200 mm) wheels in front and 19 in × 10 in (480 mm × 250 mm) in the rear.