Heavy Duty Tire Block Sipe Configuration for Ice Traction and Wear
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Solution Overview
Problem
Heavy duty pneumatic tires face challenges in achieving excellent ice performance and wear resistance, particularly due to uneven wear caused by high ground pressure and open sipes in existing designs.
Innovation Solution
The tire features shoulder and middle land regions with specific groove patterns, including zigzag and straight sub-grooves, and splitting sipes that divide blocks into central and outside pieces, with closed and open sipes designed to enhance friction and prevent uneven wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open sipes are provided on outside block pieces of middle blocks, then ice performance is improved, but uneven wear occurs due to high ground pressure
Solution Approach 1:
The patent applies different sipe configurations to different block regions: middle blocks (subject to high ground pressure) are equipped with closed sipes to prevent uneven wear, while shoulder blocks are equipped with open sipes to enhance ice performance. This local differentiation resolves the contradiction by optimizing each region for its specific functional requirements.
Solution Approach 2:
Instead of providing open sipes on middle blocks as in conventional designs, the patent inverts the approach by providing closed sipes on middle blocks and open sipes on shoulder blocks. This inversion allows the middle blocks to maintain wear uniformity while shoulder blocks provide ice performance enhancement.
2Force
If block pieces are made flexible to scratch road surface, then friction on ice is increased, but wear resistance decreases
Solution Approach 1:
The patent creates different block piece characteristics in different regions: outside block pieces of middle blocks have closed sipes that maintain structural integrity and wear resistance, while outside block pieces of shoulder blocks have open sipes that allow flexible deformation for enhanced ice friction. This local quality differentiation resolves the contradiction between friction enhancement and wear resistance.
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 design effectively improves ice performance by flexible deformation of block pieces and uniform wear progression, preventing uneven wear and enhancing traction and stability on ice and dry surfaces.
Implementation Method 1
Each of the block pieces is flexibly deformed when contacting with road surface, and the edges of the block piece scratch the road surface, therefore, the frictional force on the ice is increased
Implementation Method 2
the edges of the block piece scratch the road surface, therefore, the frictional force on the ice is increased
Data Source
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AI summary
A heavy duty pneumatic tire comprises a tread portion 2 divided into shoulder land regions 11 and middle land regions 10. The shoulder land regions 11 comprise shoulder blocks 40. The middle land regions 10 comprise middle blocks 16. At least one of the shoulder blocks 40 and at least one of the middle blocks 16 are each divided by two splitting sipes 25 into a central block piece 30 and outside block pieces 31 on both sides thereof. Each outside block piece 31 of the middle blocks 16 is provided with a closed sipe 33. Each outside block piece 31 of the shoulder blocks 40 is provided with an open sipe 45.