Heavy Duty Tire Tread Groove Width Distribution
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Solution Overview
Problem
Heavy duty pneumatic tires experience uneven wear, particularly center wear, due to the premature wearing of blocks in the tread crown region, which can lead to decreased drainage performance and wet traction when attempts to reduce this wear compromise the tire's design.
Innovation Solution
A heavy duty pneumatic tire design featuring circumferentially continuous main grooves and axial grooves that form blocks with varying widths and inclinations, distributing load evenly across the tread and maintaining drainage performance by using zigzag crown and shoulder main grooves, and hexagonal treads with shallow grooves for improved rigidity and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove width of crown main groove is decreased to increase block rigidity and reduce center wear, then uneven wear resistance is improved, but drainage performance deteriorates and wet performance decreases
Solution Approach 1:
The patent applies different groove widths to different regions: the crown main groove has a smaller width (1.5-3.0mm) to increase block rigidity and reduce center wear, while the shoulder main groove has a larger width (3.0-5.0mm) to maintain drainage performance. This local differentiation allows each region to optimize its function without compromising the other.
2Reliability
If block rigidity is increased by decreasing groove widths to prevent center wear, then wear resistance is improved, but the tire structure becomes more complex
Solution Approach 1:
The tread pattern is segmented into distinct regions (crown region and shoulder region) with different groove width characteristics. The crown main groove is separated from the shoulder main groove, allowing independent optimization of each segment's groove width to achieve both wear resistance and structural manageability.
Data Source
AI summary
A heavy duty pneumatic tire comprises a tread portion provided with circumferentially continuously extending main grooves and axial grooves connecting between the main grooves to form blocks. The main grooves include a zigzag crown main groove disposed on each side of the tire equator, and a zigzag shoulder main groove disposed axially outside each crown main groove, wherein the groove width of the crown main groove is less than the groove width of the shoulder main groove. The axial grooves include crown axial grooves circumferentially dividing crown blocks disposed between the crown main grooves and each having a substantially hexagonal tread, and middle axial grooves circumferentially dividing middle blocks disposed between each crown main groove and the adjacent shoulder main groove and each having a substantially hexagonal tread, wherein the groove width of the middle axial grooves is more than the groove width of the crown axial grooves.