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Tire insulation

IP.com Disclosure Number: IPCOM000125689D
Publication Date: 2005-Jun-13
Document File: 2 page(s) / 62K

Publishing Venue

The IP.com Prior Art Database

Abstract

The roll resistance of a vehicle tire is closely related to the temperature of the tire. When the tire has been warmed up to higher temperature by the deformation that the road contact during traveling give rise to, the rubber of the tire becomes softer, which means that the deformations of the tire that occur due to the contact between the tire and the ground take place with less resistance, and thus the roll resistance of the tire is reduced. The present invention provides an insulation arrangement between the rim and the air enclosed in the tire, said insulation is preferably constituted by a layer of mineral wool, such as glass wool, e.g. of the type sold under the trademark name Gullfiber, or rock wool. Other alternative insulation means are however possible, such as a foam material filled in the tire, or an active material with variable heat insulating properties applied to the surface of the rim that faces the cavity.

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Tire insulation

It is a well known fact that the roll resistance of a vehicle tire is closely related to the temperature of the tire. When the tire has been warmed up to higher temperature by the deformation that the road contact during traveling give rise to, the rubber of the tire becomes softer, which means that the deformations of the tire that occur due to the contact between the tire and the ground take place with less resistance, and thus the roll resistance of the tire is reduced.  The required time to reach the nominal value of the roll resistance of a tire is among other things dependent on the size of the tire. Due to their size, heavy vehicle tires consequently requires a relatively long time, up to two hours traveling time, to be warmed up enough for the roll resistance to reach its nominal value.

The warming up process of the tire is being counteracted by the cooling that occurs due to the contact between the tire and a cold roadway. Furthermore, the rim onto which the tire is attached serves as a thermal bridge between the ambient air and the air enclosed in the tire and thus delays the warming up process of the tire.

This problem has previously been addressed by US 4471999, which discloses a tire provided with a rim having an insulating coating of low thermal conductivity material, such as polypropylene or polyurethane, applied on the inner surface of the rim which is exposed to the interior of the tire, in order to reduce the cooling of the air enclosed in the tire.

The present invention approaches the above mentioned problem in a similar way by providing an insulation arrangement between the rim and the air enclosed in the tire. However, instead of using a coating of polymeric material, the present invention utilizes mineral wool as insulating material, thus providing an easily applicable insulation material at a relatively low cost. The mineral wool can be either glass wool, e.g. of the type sold under the trademark name Gullfiber, or rock wool. The figure shows a section of a tire 1, whereby the tire is attached to a rim 2 such that an i...