crankshaft vs trunnion

crankshaft

noun
  • A rotating shaft that drives (or is driven by) a crank. 

verb
  • To deform in such a manner that part of the rod or bolt is displaced sideways, offset from the longitudinal axis of the part, but remains parallel with the part's main longitudinal axis, with the final shape somewhat resembling a crankshaft. 

trunnion

noun
  • A shaft, held by a bearing, at each end or side of a rotatable object. 

  • A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool. 

  • A similar rotational bearing used in automotive suspensions. 

  • One of the short stubby bearings on either side of a cannon; a gudgeon. 

How often have the words crankshaft and trunnion occurred in a corpus of books? (source: Google Ngram Viewer )