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Which drive type throws the pinion into mesh by inertia?

  • A.The permanent magnet drive, in which the field is provided by magnets and the pinion is moved by the armature shaft
  • B.The Bendix drive
  • C.The pre-engaged drive, in which a solenoid moves the pinion into mesh before the main current is applied
  • D.The reduction gear drive

Answer: B

A Bendix pinion is carried on a coarse screw thread and its inertia throws it along into mesh when the armature spins. It is simple but noisy and hard on the ring gear. Pre-engaged drives superseded it. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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