Tyre balancing compositions

Inactive Publication Date: 2005-07-21
LARS BERTIL CARNEHAMMAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The object of the present invention is to eliminate or substantially reduce the above mentioned remaining level of vertical accelerations as well as provide a significant reduction of the amount of composition needed per tyre. It has now been found that by incorporating or imbedding into the gel layer a certain amount of solid masses or bodies of

Problems solved by technology

Similarly, imperfections in the rim will also induce vibrations.
However, quite apart from giving rise to a diffuse lead pollution in the environment through the weights falling off, this method can only compensate (and even at best only partially) for vibrations caused by non-homogeneous mass distribution in the wheel assembly, and since the other imperfections mentioned above are just as important sources of vibrations, lead weight balancing is not a satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] A DFC-gel (250 g) consisting of 1 weight part of HD polyethylene disks (specific weight 0.9, disk average diameter: 4.5 mm, disk average height 3 mm), and 2 weight parts of a visco-plastic gel according to European patent no. 0557365 and consisting of an ethylene oxide (EO) / propylene oxide (PO) copolymer (UCON 50-HB-5100 from Union Carbide, theoretical molecular weight equal to 4000) and fumed silica (Aerosil 202 from Degussa), was introduced into the cavity of a Michelin 175 / 65 / R14 tyre. The tyre was mounted on a car and driven until all vibrations disappeared. The wheel assembly was dismounted from the car, and measurement in a spin-balancing machine showed only insignificant residual weight imbalance. Inspection of the inner tyre wall showed an uneven distribution of the polyethylene pellets as would be expected if balancing is to take place.

example 2

[0059] 100 g of a visco-plastic gel according to European patent no. 0557365 and consisting of an ethylene oxide / propylene oxide copolymer (L1 from Lyondell Chemical Worldwide, Inc., EO to PO ratio equal to 1:1 and theoretical molecular weight (Mw) equal to 6500) (74.0%), castor oil No. 1 (18.5%) and fumed silica (Aerosil A300 from Degussa) (7.5%) was introduced into the cavity of a Michelin 175 / 65 / R14 tyre and spread around the inner perimeter. HD polyethylene disks (specific weight 0.9, disk average diameter: 4.5 mm, disk average height 3 mm) were then sprinkled evenly on top of the gel layer. The tyre was mounted on a car and driven until all vibrations disappeared. The wheel assembly was dismounted from the car, and measurement in a spin-balancing machine showed only insignificant residual weight imbalance. Inspection of the inner tyre wall showed a distribution of the polyethylene pellets as would be expected if balancing is to take place.

example 3

[0060] 250 g of a visco-plastic gel according to European patent no. 0557365 and consisting of 93% of a 4:1 mixture of two ethylene oxide / propylene oxide copolymers (L1 from Lyondell Chemical Worldwide, Inc., EO to PO ratio equal to 1:1 and theoretical molecular weight (Mw) equal to 6500 (4 parts), and L1-Diol from Lyondell Chemical Worldwide, Inc., EO to PO ratio equal to 1:1 and theoretical molecular weight (Mw) equal to 13000) (1 part)) and 7% of fumed silica (Cab-O-Sil TS720 from Cabot Corporation) was introduced into the cavity of a Michelin XH4 235 / 75 / 15 tyre and spread around the inner perimeter. LD polyethylene spheres (specific weight 0.85, sphere average diameter: 4 mm) were then sprinkled evenly on top the gel layer. The tyre was mounted on a sports utility vehicle and driven until all vibrations disappeared. The wheel assembly was dismounted from the vehicle, and measurement in a spin-balancing machine showed only insignificant residual weight imbalance. Inspection of th...

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Abstract

The invention relates to tyre balancing compositions having improved balancing properties comprise a visco-plastic gel and solid bodies having an average smallest dimension in the range of 0.5-5 mm; preferably 1-4 mm, more preferably around 3 mm. When applied in a layer to the inside of a motor vehicle tyre, the compositions act by allowing the solid bodies move through the gel and to concentrate in areas to counteract imbalances. The solid bodies preferably have an average ratio α between their smallest and their largest dimension of α≦2, more preferably α≦1.5, especially around 1. The visco-plastic gel preferably has a storage modulus (G′) between 1000 Pa and 25000 Pa at 22° C., a loss modulus (G″) smaller than the storage modulus, and a critical yield stress above 3 Pa at 22° C. The bodies may be shaped as prolate or oblate ellipsoids, cylinders, rectangular paralleipipeds, or spheres, or mixtures of such bodies; they may have an apparent specific gravity in the range of 500-3000 kg/m3, preferably 600-2000 kg/m3, in particular 700-1000 kg/m3, especially 800-900 kg/m3; they may be made from polyolefins, polystyrene, polyvinyl chloride, polyamide, rubber or glass. The weight ratio between the solid bodies and the gel is from 10:1 to 1:10, preferably from 5:1 to 1:5, in particular from 2:1 to 3:1, such as from 1:1 to 1:2. The invention further concerns a tyre balancing kit and a method for balancing automobile wheel assemblies.

Description

RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 019,068, filed Apr. 26, 2002 which is a national stage application of International Application No. PCT / DK00 / 00331, filed Jun. 21, 2000 which claims priority to European Application No. 99112199.7, filed Jun. 24, 1999.FIELD OF THE INVENTION [0002] The present invention relates to tyre balancing compositions for use in eliminating / reducing vibrations in motor vehicle wheel assemblies related to tyre and rim imperfections, as well as to the use of such compositions. BACKGROUND OF THE INVENTION [0003] Vibrations in rolling wheel assemblies (tyre+rim) are caused by several, different types of tyre imperfections, the most important being: [0004] Non-homogeneous mass distribution [0005] Stiffness variations [0006] Geometric variations [0007] Radial and lateral run outs [0008] Eccentricity [0009] Similarly, imperfections in the rim will also induce vibrations. [0010] The at present most co...

Claims

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Application Information

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IPC IPC(8): B60C19/00G01M1/32
CPCB60C5/004B60C19/003G01M1/326F16F15/363F16F15/366C10M171/06
Inventor RONLAN, ALVIN
Owner LARS BERTIL CARNEHAMMAR
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