Pneumatic Tire Lug Groove Width Differentiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radial tires for heavy loads face a conflict between improving snow braking performance and reducing rolling resistance, as tread patterns that excel in snow braking tend to increase rolling resistance, and those that reduce rolling resistance compromise snow braking performance.
Innovation Solution
The pneumatic tire design incorporates a combination of circumferential main grooves and lug grooves, with a narrow first lug groove portion that closes during ground contact to increase stiffness and reduce rolling resistance, and a wider second lug groove portion that remains open to enhance snow braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a block pattern is adopted to reduce rolling resistance, then fuel economy is improved, but snow braking performance deteriorates
Solution Approach 1:
The invention applies different groove width characteristics to different portions of the lug grooves. The first lug groove portion (in the tire circumferential direction) has a narrow groove width (2.0-5.0 mm) to increase stiffness and reduce rolling resistance, while the second lug groove portion (in the tire width direction) has a wide groove width (5.0-10.0 mm) to ensure edge component and improve snow braking performance. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Reliability
If a tread pattern based on ribs is used to improve snow braking performance, then traction on snow is enhanced, but rolling resistance increases
Solution Approach 1:
The invention differentiates groove widths in different directions within the same lug groove structure. The narrow first lug groove portion (2.0-5.0 mm) in the circumferential direction reduces rolling resistance by allowing block connection, while the wide second lug groove portion (5.0-10.0 mm) in the width direction maintains edge component for snow braking. This resolves the contradiction without requiring a rib-based tread pattern.
3Reliability
If the groove width of lug grooves is increased to enhance snow braking performance, then edge component is improved, but rolling resistance performance deteriorates
Solution Approach 1:
The invention applies different groove width specifications to different portions of the lug grooves. The first lug groove portion has a narrow groove width of 2.0-5.0 mm to reduce rolling resistance, while the second lug groove portion has a wide groove width of 5.0-10.0 mm to improve snow braking performance. This local differentiation allows each portion to optimize for its specific function.
Solution Approach 2:
The invention divides the lug groove into two distinct portions with different width characteristics: the first lug groove portion (narrow, 2.0-5.0 mm) and the second lug groove portion (wide, 5.0-10.0 mm). This segmentation allows independent optimization of each portion for its specific function, resolving the contradiction between rolling resistance and snow braking performance.
Data Source
AI summary
The pneumatic tire includes a plurality of circumferential main grooves and extending in the tire circumferential direction, and a plurality of land portions partitioned by the circumferential main grooves. One row of the land portion includes a plurality of lug grooves that pass through the land portion in the tire width direction and is disposed at predetermined intervals in the tire circumferential direction, and a plurality of blocks partitioned by the lug grooves. Also, the lug groove includes a first lug groove portion and at least one second lug groove portion opening into one of the circumferential main grooves. Also, the groove width b of the first lug groove portion and the groove width B of the second lug groove portion have the relationships of 2.0 mm≦b≦5.0 mm, 5.0 mm≦B≦10.0 mm, and b<B.