A Review of Patents in Tyre Cooling

Abstract

Recent Patents On Engineering 2 (2008) pp. 87-94Netscher et al. 2 ABSTRACTA number of patents on tyre cooling have been reviewed with a focus on those which can be applied to earthmoving tyres for the mining industry. The mechanisms of heat transfer within the tyre carcass are introduced as well as the basic tyre structure and effects of overheating on tyre operation. The tyre cooling patents are separated into five functional groups and reviews are made based on practicality and potential for significant heat transfer. This analysis has made it evident that potential cooling effectiveness is often compromised by practicality of an invention. The patents deemed to have the most potential for cooling are those which incorporate a working fluid which undergoes a phase change to transfer heat between different regions of the wheel assembly. Finally, these inventions are also related to current research projects which aim to develop a new cooling technique and extend the working life of earthmoving tyres.Keywords: tyre cooling, heat dissipation, rotating heat pipes, air circulation, conduction heat transfer, tyre chamber Recent Patents On Engineering 2 (2008) pp. 87-94Netscher et al.3

Theory of powdery rubber wear

“…This is due to the reduction in the internal damping in the rubber, and consequently strong increase in the crack tip propagation velocity (see, e.g., figure 5). This effect is well documented experimentally, e.g., studies by S A Bridgestone (2002), reported on in [29], show a decrease in the tire life for truck tires by a factor of ∼5 as the environmental temperature increases from 5 to 40 • C.…”

Disperse-and-Mix: Oil as an ‘Entrance Door’ of Carbon-Based Fillers to Rubber Composites

“…A tire consists of bead-in contact with the rim of the wheel, carcass-the framework of the tire, and tread-the focus of this study-is in direct contact with the road and therefore, exposed to extensive abrasion [28] (Figure 1). The rotation of the tire under the weight of the vehicle results in repeated deformation that generates high friction and consequent elevation in its temperatures [29], e.g., 120 °C was measured in tires of trucks [30]. Therefore, high TC [31] of the tread is essential to efficiently dissipate the heat (vide infra).…”

“…These properties are interlinked; friction energy is directly converted into heat, resulting in temperature elevation of the tire. The poor thermal conductivity of the tread compound loaded with CB (0.27 W m −1 K −1 ) [30] results in a higher rate of heat generation than The rotation of the tire under the weight of the vehicle results in repeated deformation that generates high friction and consequent elevation in its temperatures [29], e.g., 120 • C was measured in tires of trucks [30]. Therefore, high TC [31] of the tread is essential to efficiently dissipate the heat (vide infra).…”

“…These properties are interlinked; friction energy is directly converted into heat, resulting in temperature elevation of the tire. The poor thermal conductivity of the tread compound loaded with CB (0.27 W m −1 K −1 ) [30] results in a higher rate of heat generation than its dissipation to the ambient air. The temperature increase accelerates the fatigue of the rubber and changes its properties, resulting in significant strength loss, mechanical failures, reduced durability, and abrasion [2].…”