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Which additional capability does the inner joint require?

  • A.Plunge to accommodate the change in length
  • B.A greater angular capacity than the outer joint, since the inner end of the shaft moves through a wider arc
  • C.Higher torque capacity
  • D.Freedom to rotate about the shaft axis independently of the outer joint during the movement of the suspension

Answer: A

As the suspension moves, the distance between the differential and the hub changes, so the inner joint must allow the shaft to slide as well as to articulate. The tripod design does both. Angular capacity is greater at the outer joint because of the steering. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist.

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