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Driveshaft/halfshaft design

Driveshaft/halfshaft design

Driveshaft/halfshaft design

General question.

Why are driveshafts/halfshafts engineered the way they are?

Say for a 100-200hp vehicle(2wd or 4wd)the driveshaft to the rear diff is ~1.5inch in diameter and hollow while the halfshafts to the front wheels of a 2wd are ~3/4 inch in diameter and solid. The larger hollow shaft has less torque load than the smaller diameter hahfshafts.

Length?,wrapup?,material?,rotational jerk(impact loads)?

RE: Driveshaft/halfshaft design

Critical speed.

Mike Halloran
Pembroke Pines, FL, USA

RE: Driveshaft/halfshaft design

incidentally both your estimated ODs are very small, I'm more used to numbers like 2 1/2 (for a two piece) and  1 1/4 respectively.


Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: Driveshaft/halfshaft design

Thankyou Greg.

I was hoping a guy like you would also answer the gist of the question. (;<))


RE: Driveshaft/halfshaft design

Mike's point was entirely right, propshafts are (often) designed for whirl, halfshafts for torque capacity. Halfshafts are often made from the well titled axle-steel, whereas you can make propshafts from aluminium, steel, MMC or carbon fibre, and no doubt there are other examples.


Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

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