Reference: Kingpin
Reference information:
Kingpin
A hardened steel pin that is passed through the steering knuckle and axle end. The steering knuckle pivots about the kingpin. A vertical or inclined shaft about which a steered wheel pivots. Kingpins were used on early solid-axle front suspensions because they were sturdy and allowed the wheels to pivot in one plane for steering. To be adapted to A-arm suspension systems, kingpins had to be fitted with additional pivoting members at the top and bottom. The configuration shown here was typical, with the kingpin running straight through the steering knuckle. Ball joints make for a tighter and less complex arrangement. The British term is trunion.
Attaching pin on a semitrailer that attaches to and pivots within the fifth wheel of a tractor or converter dolly
http://www.motorera.com/dictionary/KI.HTM
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peer agreement (net): +5