Tread Pattern Segmentation for Construction Tire Thermal Management
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Solution Overview
Problem
Tires for large construction dump trucks experience excessive heating and reduced endurance due to high loads and inflation pressures, leading to potential separation of crown reinforcement plies and degradation of rubber properties.
Innovation Solution
A tread design with a central part and edge parts featuring incisions that close during contact to reduce heating, combined with a higher number of evenly distributed ventilation zones and relief elements, maintaining stiffness and reducing thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the tread is provided with deep grooves and high volume hollow rate (30-40%) to improve ventilation and reduce contact pressure, then the heating is reduced, but the stiffness of the tread is compromised and wear performance deteriorates
Solution Approach 1:
The tread is segmented into a central part with low hollow rate (0-10%) for stiffness and wear resistance, and edge parts with high hollow rate (35-45%) for ventilation and pressure distribution. This spatial segmentation allows each zone to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the tread are given different hollow rates according to their functional requirements. The central part has minimal hollows to maintain structural integrity, while the edge parts have extensive hollows for thermal management and contact pressure optimization.
2Duration of action of moving object
If the tread is provided with high volume hollow rate (30-40%) to improve ventilation and reduce contact pressure, then the endurance is improved, but the wear performance deteriorates due to reduced material contact
Solution Approach 1:
The tread is divided into central and edge zones with different hollow rates. The central part maintains high material density (0-10% hollow rate) for wear resistance, while edge parts provide ventilation (35-45% hollow rate) for endurance enhancement.
Solution Approach 2:
Each region of the tread is optimized locally: the central part prioritizes wear resistance through minimal hollowing, while the edge parts prioritize thermal management and pressure distribution through extensive hollowing, thereby improving endurance without sacrificing overall wear performance.
3Force
If the inflation pressure is increased to at least 6 bars to carry heavy loads (20-100 tons), then the load capacity is improved, but the heating of the tread and crown reinforcement increases
Solution Approach 1:
The edge parts of the tread are designed with high hollow rates (35-45%) to provide localized ventilation channels that actively cool the tread and crown reinforcement in the high-stress contact zones, enabling the tire to sustain high inflation pressures (≥6 bars) and heavy loads (20-100 tons) without excessive heating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces tire heating, enhances endurance, and increases rolling speed, while extending the lifespan of the tire by minimizing thermal sources and contact pressure, and improving wear performance by 10% compared to prior art designs.
Implementation Method 1
these incisions having an appropriate depth and width so that they close when passing through the contact; the central part being provided with a plurality of incisions of general transverse orientation opening into the circumferential incisions delimiting the central part
Implementation Method 2
the presence of a greater number of evenly distributed ventilation zones formed by the multiple incisions of the central part and the presence of a greater number of relief elements on this same central part. As a result, the heating of the structure is reduced
Implementation Method 3
the sculptures for tire treads fitted to 'dumper' type vehicles - these vehicles using tires with a diameter of between 2.5 m and 4 m - have the dimensional particularities following: An average groove depth at least equal to 65 mm and at most equal to 100 mm
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a tire provided with a carcass reinforcement, on the exterior of which a crown reinforcement is radially mounted, said crown reinforcement consisting of a stack of a plurality of plies of reinforcements, the latter forming non-zero angles with the circumferential direction, said tire including a tread (10) which is to contact the ground during travel, said tread (10) including a plurality of cuts defining raised elements for forming a tread pattern, and being such that the tread includes a central portion (20), the width of which is between 40 and 50% of the total width of the tread, and edge portions (21) on either side of the central portion, the central portion (20) being provided with a plurality of incisions having a generally transverse orientation (40), which are capable of closing coming into contact with the ground, said tread being characterized in that each edge portion (21) includes a plurality of grooves having a generally transverse orientation (70) and defining a plurality of raised elements (80), the number of raised elements (80) of each edge portion being equal to the number of raised elements (50) of the central portion, said number of elements being equal to at least 44 and at most equal to 49, and the overall amount of recesses of said tread being at most equal to 19 vol %.