Pneumatic Tire Block Sipe Termination for Braking and Durability
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Solution Overview
Problem
Pneumatic tires with sipes and recessed portions on the tread block face issues of non-uniform ground contact pressure, leading to deteriorated braking performance on icy surfaces and increased risk of rubber chipping and cracking, which affects durability.
Innovation Solution
A pneumatic tire design featuring blocks with a central hole portion and radially extending sipes where the inner ends terminate away from the hole, and inclined projecting ridges on the side walls to enhance ground contact pressure uniformity and prevent excessive falling, thereby improving braking performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes extend radially from the center portion of the block and communicate with a recessed portion at the radial center, then ground contact pressure uniformity is improved, but the center portion of the block becomes liable to fall causing rubber chipping and cracks
Solution Approach 1:
The invention extracts the harmful communication between sipes and recessed portion by making the sipe inner ends terminate at positions away from the recessed portion. This separation removes the structural weakness while preserving the pressure-distributing function of the sipes and recessed portion configuration.
Solution Approach 2:
The invention applies preliminary anti-action by pre-preventing the block falling issue through proper sipe termination positioning. By designing sipes to end before reaching the recessed portion, the structure proactively avoids the chain reaction of block falling, rubber chipping, and crack formation.
2Reliability
If sipes extend radially from the center portion of the block, then braking performance on icy road surfaces is improved, but cracks initiate from outer side edges of the sipe
Solution Approach 1:
The invention converts the potential harm of sipe extension into benefit by strategically terminating sipes before they reach critical zones. The sipes maintain their traction-enhancing function on icy surfaces while their controlled termination prevents crack initiation, transforming a potentially harmful design into a beneficial one.
3Reliability
If the center portion of the block is made recessed to improve ground contact pressure distribution, then braking performance is improved, but foreign substances such as small pebbles are nipped in the recessed portion
Solution Approach 1:
The invention applies local quality by creating different functional zones within the block structure. The recessed portion maintains its pressure-distributing function, while the sipe termination positioning creates a protective zone that prevents foreign substance entrapment. Each region is optimized for its specific function without compromising the other.
Data Source
AI summary
Provided is a pneumatic tire where grooves and blocks defined by the grooves are formed on a tread portion, wherein the block includes: a ground contact surface; a hole portion formed in a center portion of the ground contact surface; and sipes extending radially from the hole portion which is the center of radial extension of the sipes, and the sipes are formed such that inner ends of the sipes in a radial direction terminate at a position away from the hole portion, and outer ends of the sipes in the radial direction terminate within the block.