Concept of torque

  • Thread starter Ask1122
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Hi all, today our lecturer has told us something which i do not really understand, and i was hoping if someone can clear up the issue for me.

The following is what was said: we have a motor and we have a pump, the pump and motor shaft is joined by a coupling. If there is a misalignment between the pump and the motor shaft, the 'TORQUE' will causes the pump shaft to bend. Now this is what i don't understand, i always think of torque as a twisting force, how can a twisting force 'bend' something? In order to 'bend' the pump shaft, wouldn't you require a 'bending force' (which i thought it was the force exerted by the bearings which causes the pump shaft to bend when it is mis-aligned)? I think i am missing a basic concept on torque here, it will be really helpful if someone can clarify for me!

And secondly, if the pump and motor shaft is misaligned, wouldn't there be bending shafts for both the motor AND the pump? Why is it only the pump shaft that will be bend??

Sorry for my elementary questions, but i just can't seem to grasp this concept well. Thank you for the helps guys!!
 

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