novice
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Joined: Tue Aug 07, 2012 2:55 pm

Fusible Tire Plugs?

Thu Mar 14, 2013 2:03 pm

"Fusible plugs offer protection from tire blowouts caused by thermal expansion that is generated in the tire under exrta hard braking conditions. These fusible plugs are fitted in the tubless wheel hubs by means of a fusible alloy that melts under excessive heat conditions and allows the plug to be blown out by the tire air pressure. This prevents excessive pressure buildup in the tire by allowing the air to leak away slowly."

Why do you need a plug? could you not just have a hole in the wheel hub and cover it up with fusible alloy then once it melts the air gets out, i'm just missing the point a the plug

Thanks
 
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Starlionblue
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RE: Fusible Tire Plugs?

Thu Mar 14, 2013 2:08 pm

Quoting novice (Thread starter):
Why do you need a plug? could you not just have a hole in the wheel hub and cover it up with fusible alloy then once it melts the air gets out, i'm just missing the point a the plug

Aren't you describing the same thing as what exists?
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
fr8mech
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RE: Fusible Tire Plugs?

Thu Mar 14, 2013 2:13 pm

Quoting novice (Thread starter):
Why do you need a plug?

So the plug can be replaced at the shop. If you fill a hole with a fusible alloy, you have to include another specialized process at wheel build-up.

Currently, you just install and o-ring and a plug.
When seconds count...the police are minutes away.
 
novice
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RE: Fusible Tire Plugs?

Thu Mar 14, 2013 2:54 pm

This is gettting a bit trivial, though i can't see why then in the delevopment of the wheel hub it wouldn't include another speciqalized process whereby inserting a hole from the internal wheel hub to the external and filling the top part of the hole with fusible alloy which melts at a certain temp allowing the air to be released.
 
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Starlionblue
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RE: Fusible Tire Plugs?

Thu Mar 14, 2013 2:58 pm

Quoting novice (Reply 3):

This is gettting a bit trivial, though i can't see why then in the delevopment of the wheel hub it wouldn't include another speciqalized process whereby inserting a hole from the internal wheel hub to the external and filling the top part of the hole with fusible alloy which melts at a certain temp allowing the air to be released.

I thank fr8mech for explaining. The way it is built, you only need to replace the plug and the hub is of simpler construction.

While your solution might, at first glance, seem more elegant, it does not seem more practical in real world operations.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
fr8mech
Posts: 6845
Joined: Mon Sep 26, 2005 9:00 am

RE: Fusible Tire Plugs?

Thu Mar 14, 2013 4:04 pm

Quoting novice (Reply 3):
This is gettting a bit trivial, though i can't see why then in the delevopment of the wheel hub it wouldn't include another speciqalized process whereby inserting a hole from the internal wheel hub to the external and filling the top part of the hole with fusible alloy which melts at a certain temp allowing the air to be released.

Ask yourself why that is better than being able to replace a melted fuse plug during overhaul.

Currently, the overhaul shop only needs to stock the plug and o-ring. Install them as an assembly and properly torque and safety.

Using your solution, the shop would have to have the alloy and a way to melt the alloy. I suspect that QC would have to adjust the process to ensure that the alloy has flowed correctly and properly filled the gap. You may also have a problem re-using the wheel. You would have to ensure that all the old alloy has been removed before you installed the new alloy.

What advantages do you see with your method?
When seconds count...the police are minutes away.
 
novice
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RE: Fusible Tire Plugs?

Thu Mar 14, 2013 6:04 pm

fr8mech "Ask yourself why that is better than being able to replace a melted fuse plug during overhaul."


I didn't realise that the fuse plug melted too? i thought the plug was attached to the wheel hub via meltabe fusible alloy which when melted blew out the plug due to the tyre pressure and if this is the case where the plug is attached to the wheel hub via meltabe fusible alloy i can see the point now, as you pointed out you would have to adjust the process to ensure that the alloy has flowed correctly and properly filled the gap. You may also have a problem re-using the wheel and also you would have to ensure that all the old alloy has been removed before you installed the new alloy.
 
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jetmech
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RE: Fusible Tire Plugs?

Fri Mar 15, 2013 3:08 am

Quoting novice (Reply 6):
I didn't realise that the fuse plug melted too? i thought the plug was attached to the wheel hub via meltabe fusible alloy

The fuse plug is basically a steel bolt with a hole drilled through along its axis. This hole is filled with the fusible material, with the entire bolt screwed into the appropriate internal thread feature on the wheel rim. The only part that melts is this cylindrical "slug" of material. The bolt does not melt. The problem I see with directly drilling a hole in the wheel rim and filling it with fusible material - beside the practicality - is the issue of heat treatment of the aluminium rim.

The type of heat application required to properly bond the fusible material directly to the aluminium rim may not be ideal from the heat treatment point of view, and may cause a local area of undesirable material properties. It may also be intrinsically difficult to bond these two materials together.

Regards, JetMech

[Edited 2013-03-14 20:11:26]
JetMech split the back of his pants. He can feel the wind in his hair :shock: .
 
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HAWK21M
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RE: Fusible Tire Plugs?

Sun Mar 17, 2013 6:16 am

Making it in the form of a plug or a seperate part from the hub enables it to be replaced easily during overhaul.
If not mistaken all fuseable plugs are replaced mandatory during wheel overhaul...can anyone confirm this?.
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