Engineering Give examples of mechanical power transmission failure and solutions for a car

AI Thread Summary
Mechanical power transmission failures in cars can arise from bending or twisting of the prop shaft due to excessive torque, leading to high shear stress and potential interruptions in power transmission. Solutions include replacing the damaged shaft and ensuring proper torque levels on bolts and nuts to prevent high torque generation. To prevent future issues, using more durable materials for the prop shaft and considering a hollow design can help reduce torque effects. However, twisting itself does not disrupt power transmission unless it exceeds design limits, while solid shafts are generally less advantageous than hollow ones due to increased weight and inertia. Coatings primarily provide wear and corrosion resistance rather than enhancing torque resistance.
lee123456789
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Homework Statement
Give examples of mechanical power transmission failure and solutions on a car
Relevant Equations
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just want check if i got this right. is there anything i can improve or add on this example i have?

Cause and why.
A cause could be bending or twisting of the prop shaft due to high torque. High torque causes high angle of twist and torsion. The high torque cause high shear stress distrubution over the prop shaft, inducing bending and twisting in the shaft interrupting the power transmission.

Solution to solve the issue.
Replace shaft.
Turning bolts and nuts to proper torque level to ensure none high levels of torque is being generated.

How to prevent issue occurring again
Manufuacture the prop shaft with high durable material.
Replace the solid shaft with hollow shaft reduce torque generated.
hardened shaft with coating to provide higher stress and torque resistance
 
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lee123456789 said:
[...] inducing bending and twisting in the shaft interrupting the power transmission.
Unless a bad design or installation, bending shouldn't be present in a prop shaft. Twisting doesn't interrupt power transmission; too much twisting leads simply to failure.
lee123456789 said:
Replace the solid shaft with hollow shaft reduce torque generated.
I'm not sure what you mean here by "torque generated", but a solid shaft is rarely advantageous over a hollow shaft (higher weight & inertia for equivalent torque resistance)
lee123456789 said:
hardened shaft with coating to provide higher stress and torque resistance
I don't think a coating will increase torque resistance. It's pretty much only for wear and corrosion resistance.
 
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