Pneumatic Tyre Projections for Soft Surface Traction
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Solution Overview
Problem
Pneumatic vehicle tires designed for light trucks and similar vehicles face challenges in maintaining good handling, traction, and braking properties on snow, slush, mud, and other soft surfaces while also needing protection from premature wear and damage.
Innovation Solution
The tire design features flat projections along the block flanks with 'traction edges' that improve traction on soft surfaces and stabilize the tread blocks, while also protecting against damage from sharp objects, without compromising water drainage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projections are formed along block flanks to improve traction on soft surfaces, then traction properties are improved, but water drainage capacity may be impaired
Solution Approach 1:
The projection is designed with differentiated local properties: the first region (contact region) has a larger cross-section to provide traction edges for soft surfaces, while the second region (transition region) has a smaller cross-section to minimize interference with water drainage. This local variation in geometry allows the single projection structure to simultaneously improve traction while preserving water drainage capacity.
2Reliability
If projections are formed along block flanks to provide traction edges, then handling and braking properties are improved, but the tread block stability may be compromised
Solution Approach 1:
The projection geometry is carefully controlled with specific parameter ranges: the distance from the block flank to the projection is 0.3-1.0 mm, the projection height is 1.5-2.5 mm, and the longitudinal extent is 4-20 mm. These optimized parameters ensure the projection provides sufficient traction edges while maintaining tread block stability through proper structural support.
3Reliability
If projections extend closer to the block flank to provide more traction edges, then traction on soft surfaces is improved, but protection against water drainage impairment is reduced
Solution Approach 1:
The projection is designed with differentiated local properties: the first region (contact region) has a larger cross-section to provide traction edges for soft surfaces, while the second region (transition region) has a smaller cross-section to minimize interference with water drainage. This local variation in geometry allows the single projection structure to simultaneously improve traction while preserving water drainage capacity.
4Reliability
If the projection cross-section is increased to enhance traction, then traction properties are improved, but water drainage capacity is reduced
Solution Approach 1:
The projection is designed with differentiated local properties: the first region (contact region) has a larger cross-section to provide traction edges for soft surfaces, while the second region (transition region) has a smaller cross-section to minimize interference with water drainage. This local variation in geometry allows the single projection structure to simultaneously improve traction while preserving water drainage capacity.
Data Source
Figure 1~2
AI summary
Pneumatic vehicle tyre having a tread with at least one block row (1, 2, 3) which runs around in the circumferential direction and is separated from further profile positives by at least one circumferential groove (7, 8), and the profile blocks (1a, 2a, 3a) of which are separated from one another in the circumferential direction by transverse grooves (4, 5, 6) and have block edges (10, 11, 12, 11', 12') which bound the at least one circumferential groove (7, 8) and transverse grooves (4, 5, 6) and extend at an angle (a) of 0° to 10° with respect to the radial direction. Projections (13, 14) are formed along block edges (10, 11, 12, 11', 12'), radially inside the block surface forming the tread surface, said projections (13, 14) having a surface (13a, 14a) which runs parallel to the block surface and having an edge extending parallel to the block edge (10, 11, 12, 11', 12') at a distance (a2) of 0.3 mm to 1.0 mm, from which edge an end face (13b, 14b), which bounds the projection (13, 14), runs as far as the groove base, said end face (13b, 14b) running at an angle with respect to the radial direction which is up to 7° larger than that of the respective block edge (10, 11, 12, 11', 12').