Studded Tire Spike Geometry for Adhesion
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Solution Overview
Problem
Conventional spike designs for pneumatic vehicle tires suffer from poor adhesive connections due to large pressure gradients and low contact pressure zones, leading to weak retention forces and potential spike loss during the tire's life.
Innovation Solution
The spike geometry is optimized with a waisted central part, where the upper flange height is 25% to 45% of the spike body height, and the middle part's transition areas to the flanges have specific curved outer contours to evenly distribute the normal force from the rubber matrix, enhancing the adhesive connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional spike geometry with cylindrical central part is used, then manufacturing is simple, but adhesive connection to rubber matrix is poor due to large pressure gradients and low contact pressure zones
Solution Approach 1:
The spike body is designed with varying cross-sectional areas along its length, creating local quality differences. The central part has a smaller cross-sectional area than the upper and lower parts, which concentrates the contact pressure from the rubber matrix onto specific regions of the adhesive layer, improving adhesive connection without complicating manufacturing
Solution Approach 2:
The geometric parameters of the spike body are changed by introducing a waisted central part with reduced diameter. This parameter change modifies the pressure distribution in the adhesive connection zone, creating higher contact pressure where needed while maintaining manufacturing simplicity through standard forming processes
2Strength
If conventional spike geometry with short transition areas is used, then structural integrity is maintained, but adhesive connection is poor due to large pressure gradients in transition zones
Solution Approach 1:
The transition areas between the central part and the upper/lower parts are designed with specific geometric characteristics that create favorable local pressure conditions. The gradual change in cross-sectional area in these transition zones distributes pressure more evenly, improving adhesive connection while maintaining overall structural integrity
Solution Approach 2:
The transition areas are designed with curved surfaces rather than sharp edges, creating a more gradual transition in cross-sectional area. This curvature helps distribute contact pressure more evenly across the adhesive layer, reducing pressure gradients and improving adhesive connection strength
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
This design significantly increases the retention forces of the spikes in the tread, effectively preventing spike loss throughout the tire's life by improving the adhesive connection with the rubber material.
Implementation Method 1
This creates a chemical bond between the spikes and the rubber material of the tread
Data Source
Figure 1
Figure 2~4
Figure 5~8
AI summary
The invention relates to a spike and to a vehicle pneumatic tyre with spikes. The spikes are each inserted into a spike hole in the tread of the vehicle pneumatic tyre and have a spike body (1, 1') which is secured in the spike hole and has an upper flange (2, 2'), a foot flange (4, 4'), a central part (3, 3') which connects the upper flange (2, 2') to the foot flange (4, 4'), and a spike pin (5, 5') which protrudes beyond the spike hole or the tread surface. The central part (3, 3') of the spike body (1, 1') is constricted and has a double-cone-like outer contour.