EEVblog Electronics Community Forum

General => General Chat => Topic started by: Psi on September 25, 2012, 03:45:32 am

Title: Self inflating tyre
Post by: Psi on September 25, 2012, 03:45:32 am
So it's not electronic, but there's something awesome about this kind of mechanical solution to a problem.

Goodyear has made a tyre that regulates its own pressure using a self-inflation system inside the tyre.

From what i can tell, when the tyre pressure drops below min psi a valve automatically opens so external air can flow into a special cavity.
As the wheel rotates the squashing of this cavity pushes that air through a one-way valve and into the tyre to inflate it.
Then it automatically stops when the correct pressure is reached.

http://www.nbcnews.com/technology/futureoftech/self-inflating-tire-tech-saves-you-pump-1B6034786 (http://www.nbcnews.com/technology/futureoftech/self-inflating-tire-tech-saves-you-pump-1B6034786)
Title: Re: Self inflating tyre
Post by: vk6zgo on September 25, 2012, 04:21:40 am
It's been"just around the corner" since 1957.It seems we have reached the corner! ;D
Title: Re: Self inflating tyre
Post by: NiHaoMike on September 25, 2012, 05:23:30 am
I remember reading about something similar except it was built into the wheel, so it would work with any ordinary tire.
Title: Re: Self inflating tyre
Post by: GeoffS on September 25, 2012, 07:20:12 am
Self sealing punctures? You need Slime (http://www.slime.com/)!
Title: Re: Self inflating tyre
Post by: G7PSK on September 25, 2012, 07:30:22 am
Some form of peristaltic pump built into the tyre, Nature was there first as usual.
Title: Re: Self inflating tyre
Post by: Psi on September 25, 2012, 08:48:22 am
self inflating is of not much help at all without self sealing capability. when this tyre hit by a nail it will simply flat both the tyre and the cavity, you still can stuck in the middle of nowhere.

I think they're intended to make up for the natural slow-leak you get as air escapes between the rubber molecules.
So you don't have to keep checking and topping up.
Title: Re: Self inflating tyre
Post by: SeanB on September 25, 2012, 07:21:17 pm
Better is a central tyre inflator. Just has a tube that is plumbed through the axle or a free turning union and a pipe to the centre of the hub. Works on Gelandewagons and timber haulers.