Heavy-Load Tire Belt Structure for Uniform Ground Contact Pressure
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Solution Overview
Problem
The existing pneumatic tire for heavy loads, as described in JP 2001-138711 A, experiences excessive radial binding force due to a belt layer composed of four or more layers of belt plies, leading to non-uniform circumferential distribution of ground contact pressure.
Innovation Solution
A pneumatic tire design featuring a belt layer composed of three layers of belts, with a rubber layer between the belt layer and the carcass ply, where the rubber layer has a modulus matching the topping rubber of the first belt and a thickness between 1.5 mm and 2.0 mm, to control radial binding force and improve ground contact pressure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the belt layer is formed of four or more layers of belt plies, then the radial binding force becomes strong, but the tread cannot deform following the road surface and ground contact pressure uniformity deteriorates
Solution Approach 1:
The patent extracts one belt ply from the conventional four or more layer belt structure, reducing it to three layers. This extraction reduces the excessive radial binding force while maintaining sufficient structural support, allowing the tread to deform properly following the road surface contour.
Solution Approach 2:
The patent changes the key parameter of belt layer structure from four or more layers to exactly three layers. This parameter change optimizes the balance between radial binding force and tread deformability, improving ground contact pressure uniformity while maintaining heavy load capability.
2Reliability
If the rubber layer thickness is increased to improve impact resistance, then impact resistance improves, but the structure becomes excessively thick and may affect other performance
Solution Approach 1:
The patent optimizes the rubber layer thickness to a specific range of 1.5 mm or more and 2.0 mm or less. This parameter optimization ensures sufficient impact resistance while preventing excessive thickness that would compromise other performance characteristics such as flexibility and ground contact uniformity.
Solution Approach 2:
The patent applies a moderate thickness of rubber layer (1.5-2.0 mm) which is sufficient for impact resistance but not excessive. This partial action provides the necessary protection without over-engineering, maintaining overall tire performance balance.
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
The tire achieves improved uniformity of circumferential distribution of ground contact pressure by reducing excessive radial binding force, allowing the tread to deform more evenly with the road surface, while maintaining sufficient impact resistance and radial restraint.
Implementation Method 1
The rubber layer disposed between the belt layer and the carcass ply functions as a buffer layer that absorbs the deformation of the carcass ply
Implementation Method 2
each belt having a plurality of cords and a topping rubber covering the plurality of cords
Data Source
AI summary
A pneumatic tire includes a belt layer composed of three layers of belts and a rubber layer disposed between a carcass ply and a tread. Each belt has a plurality of cords and a topping rubber covering the plurality of cords. The belt layer includes: a first belt disposed on an outer side of the rubber layer in a tire radial direction; a second belt disposed on an outer side of the first belt in the tire radial direction; and a third belt disposed on an outer side of the second belt in the tire radial direction. A modulus of the rubber layer is the same as a modulus of the topping rubber of the first belt. The rubber layer has a thickness of 1.5 mm or more and 2.0 mm or less.