Heavy Duty Tire Block Inclined Portion Winding Deformation
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Solution Overview
Problem
Heavy load pneumatic radial tires experience significant deformation during braking, leading to reduced contact performance and impaired braking efficiency due to the 'winding deformation' of block end portions, which hampers the improvement of braking performance.
Innovation Solution
Incorporating an inclined portion on the end portion of the block, chamfered inward from the outer to the inner side in the tire radial direction, within the region of the crossing belt layer, to reduce winding deformation and enhance contact with the road surface during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a block with sipe is used to improve braking performance, then edge component and braking performance on ice are improved, but winding deformation of block end portion increases under heavy load, deteriorating contact performance
Solution Approach 1:
The patent applies local quality by forming a groove at the end portion of the block to specifically address the winding deformation problem at that location, while maintaining the sipe structure for overall braking performance. This localized structural modification allows different parts of the block to have different functional characteristics - the groove prevents deformation at the end portion while the sipe maintains edge component throughout the block.
2Force
If heavy load is applied to improve vehicle carrying capacity, then load bearing ability is improved, but deformation amount of block increases, reducing contact performance
Solution Approach 1:
The groove structure is specifically positioned at the end portion of the block where winding deformation occurs under heavy load. This localized feature provides structural support precisely where needed to maintain block shape and contact performance under heavy loading conditions without compromising the overall load bearing capacity of the tire.
3Shape
If block rigidity is increased to reduce deformation, then contact performance is improved, but braking performance on ice deteriorates due to reduced edge component
Solution Approach 1:
The groove is formed only at the end portion of the block rather than throughout the entire block structure. This localized approach provides the necessary structural support to prevent winding deformation and maintain block stability, while preserving the sipe structure and edge component in other areas of the block to maintain braking performance on ice.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A sipe (110) extended in a tire width direction is formed in a block (100) of a heavy load pneumatic radial tire. An inclined portion (120) is formed on an end portion at a kick-out side of the block (100) defined by the sipe (110). The inclined potion (120) is formed by chamfering the end portion at the kick-out side so as to be inclined inward from an outer side in the tire radial direction to an inner side in the tire radial direction. The inclined portion (120) is formed at least in a region where the crossing belt layer is formed, in the tire width direction.