Power transmission with belts at extreme temperatures?

In summary, the group is working on a design project to transmit power on the moon and has decided on a gear system. They are considering using v-belts, but are concerned about finding a material that can withstand the extreme temperatures (+100 to -200 degrees C) on the moon. They have looked into moon rover designs and suggest using a completely sealed unit with a heater to maintain normal operating temperatures. A metal material, such as steel or glass, would likely work best in this environment. Alloys like invar could also be used to maintain dimensional stability and prevent binding or slop in the gear system.
  • #1
apointyrodent
2
0
I am a student. We are working on a design project, and long story short, we need to transmit power on the moon. We have decided on a gear system but still need to transmit from the gear output to the axles, and were considering v-belts. Does a belt exist that could operate in such extreme temperatures (~+100 to -200 degrees C)? I can't seem to find much on this, any leads to info or suggestions would be appreciated.

Thanks!
 
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  • #2
Unless you are thinking about a CVT (continuously variable transmission), a chain-belt is a good substitute. Before cars had timing belts, they had steel timing chains.
 
  • #3
it isn't about the belt that exists, its about a material that can keep its strength at such a temperature range. Most materials become brittle at lower temperatures, even when they have excellent ductility at normal(earth like) temperature.

Have you looked into any vehicle design that have been to moon? Moon rover sort of things..

Or you can use a completely sealed unit with a heater inside to keep the temperature at normal operating range. 100 C should be okay, you should be worried about keeping the strength at sub zero temperatures.
 
  • #4
The other issue you run into is at such low pressures you can have some materials experiencing outgassing.
 
  • #5
A metal material would probably serve best in that type of environment. Polymers and petroleum based materials typically don't like very cold temperatures and can crack and harden especially when there is no humidity. A steel chain or possibly a glass chain would work well I would think.
 
  • #6
There are alloys such as invar that can remain dimensionally stable over a range of temperatures. That might allow you to machine the material to closer tolerances and not worry too much about binding or slop when the temperatures go extreme.
 

1. How does extreme temperature affect power transmission with belts?

Extreme temperatures can have a significant impact on power transmission with belts. At high temperatures, the rubber material of the belt can become soft and lose its grip, causing slippage and reduced power transmission. At low temperatures, the rubber material can become hard and brittle, increasing the likelihood of belt breakage. Additionally, extreme temperatures can cause expansion and contraction of the belt, affecting its tension and alignment.

2. Can belts be used for power transmission in both high and low temperature environments?

Yes, belts can be used for power transmission in both high and low temperature environments. However, it is important to select the appropriate type of belt material for the specific temperature range. For high temperatures, materials such as silicone and fluorocarbon are suitable, while for low temperatures, materials such as neoprene and nitrile are better options.

3. How can I prevent belt failure due to extreme temperatures?

To prevent belt failure due to extreme temperatures, it is important to regularly inspect and maintain the belts. This includes checking for proper tension and alignment, as well as monitoring the condition of the belt material. It is also recommended to use belts with temperature-resistant materials and to avoid operating the belts at temperatures beyond their recommended range.

4. Are there any additional considerations for power transmission with belts at extreme temperatures?

Yes, there are a few additional considerations to keep in mind when using belts for power transmission at extreme temperatures. These include using appropriate lubrication to reduce friction and heat generation, ensuring proper ventilation and cooling in the surrounding environment, and avoiding sudden changes in temperature that can cause stress on the belts.

5. Are there any specific safety precautions for working with belts at extreme temperatures?

Yes, there are some safety precautions that should be followed when working with belts at extreme temperatures. This includes wearing appropriate personal protective equipment, such as heat-resistant gloves and eye protection, and following proper handling procedures to avoid burns or injuries. It is also important to have emergency protocols in place in case of any accidents or malfunctions.

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