×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

How to insert a filament into tire
2

How to insert a filament into tire

How to insert a filament into tire

(OP)
I would appreciate any ideas regarding a way to insert a U-shaped metal filament into the inside of tire.

RE: How to insert a filament into tire

2
We need much more information regarding your idea SmartTire.
To start with, where do you want to place this U-wire? Inside the tyre's cavity or within the tyre's structure?

RE: How to insert a filament into tire

(OP)
I need to insert a conductive metal filament, or pin within the tyre structure, under the elevated section of the tread. So if you look at a tyre from the inside, you would see a small plastic control box mounted flush against the inside wall of a tire.(Opposite of exterior tread surface). Protruding from the top of the control box, would be the metal conductive filaments or pins going inside the rubber, and reaching a depth of about 1/16 inch from the bottom of the tread base. So when the tire tread wears down it will eventually expose the conductive tip of the metal filaments. That will trigger an indicator showing a worn tire.

The shape of the pin could possibly be a U-shaped pin with the base on top (that is an inverted "U") and the bottom ends would be flush with the inner surface of the tyre. The U shape would almost look like two "I" letters, connected at the top.

What I am actually asking is for a tool or method to introduce such a pin into the tyre. I hope my description is clear. Please feel free to ask for more clarifications.

RE: How to insert a filament into tire

So what you are asking for is a method for producing a self-puncturing tyre. This is the logical conclusion of your description above, because when the tyre wears down close to the level of the pin, there will already be a tunnel along which air can pass from the inside of the tyre. (Tyre treads are not designed to be the world's greatest barrier to air; that's the innerliner's job.)

Any metal pin introduced in this way would also need to be brass plated to allow a bond to form between the metal of the pin and the rubber. Next the pin must pass through textile and steel cords without damaging the cords or the pin. Finally, such an installation, even though it would be very light weight, could possibly cause problems with the static and dynamic balance and the radial run out and radial force harmonics within the tyre.

How do you propose for the signal from the control box to be carried to the indicator lights?

RE: How to insert a filament into tire

(OP)
Thanks for the valuable info. I kind of knew that this approach was a longshot.  I was trying to find a different way of introducing the pin other than having the pin inserted during the tyre molding process. The latter approach requires the collaboration of the tyre manufacturer. Can you suggest any other approach?

RE: How to insert a filament into tire

Sorry, no. There have been many attempts over the years to identify when a tread has worn down to the legal limit but nothing beats visually inspecting the tyres regularly. Some coins (e.g. the UK's 2p piece) have a ring of dots around the faces circumferences. The distance between the inside edge of these dots and the outside diameter of the coin is approximately 2mm. If you locate the tread wear indices in the grooves and stand the coin on these, this gives you an instant visual check on the remaining tread depth. If you can see any part of the ring of dots, it's time to change the tyre (assuming the legal limit is 1.6mm tread remaining that is).

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources