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Which frame type uses a large central tube as the main member?

  • A.The backbone frame
  • B.The ladder frame, whose two side rails are joined by cross members to form the characteristic open structure
  • C.The space frame
  • D.The platform frame, which is a flat floor structure with the side members integrated into the floor pan itself

Answer: A

A backbone frame carries a single large closed section tube along the centre line, with outriggers supporting the body and forks at each end carrying the suspension. It has excellent torsional stiffness for its weight. Lotus used it extensively and Tata employed it in the Nano, though it makes the transmission tunnel intrusive and complicates crash protection. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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