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Which purpose does the differential serve?

  • A.It transmits the driving thrust from the axle to the body of the vehicle through the springs or radius arms
  • B.It allows the driven wheels to turn at different speeds
  • C.It divides the torque unequally between the two wheels according to the grip available at each of them
  • D.It provides the final reduction

Answer: B

Through a corner the outer wheel travels further than the inner, so a differential is essential if the tyres are not to be scrubbed. An open differential divides torque equally regardless of grip. The reduction is provided by the crown wheel and pinion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once.

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