Crankshaft Design, Materials, Loads and Manufacturing, …
A crankshaft contains two or more centrally-located coaxial cylindrical ("main") journals and one or more offset cylindrical crankpin ("rod") journals. The two-plane V8 crankshaft pictured in Figure 1 has five main journals and four rod journals, each spaced 90° from its neigbors. Figure 1: Example (2-plane) Crankshaft