Pneumatic Tyre Spike Trough Volume Design
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Solution Overview
Problem
Existing vehicle tire strips with spikes experience a reduction in contact area and pressure between the tire and road due to the bulging rubber material around spikes, which affects ice performance.
Innovation Solution
A trough-shaped deepening around the spiking holes is designed with a volume that matches 90% to 110% of the spike body volume, maintaining the contact area by ensuring the rubber material's volume is preserved upon spike insertion, thus avoiding arching and maintaining contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spike body volume is larger than the spikel hole volume to ensure good spike seat, then the spike is securely held in the spikel hole, but the rubber material around the spike bulges outward reducing the contact area and contact pressure between the running strip and the road
Solution Approach 1:
A trough-shaped deepening is pre-formed around the spikel hole before the spike is inserted. This deepening creates a reserved volume that accommodates the rubber material displaced by the spike body, preventing the material from bulging outward and reducing the contact area. The deepening is designed with a volume of 0.9 to 1.1 times the spike body volume to optimally contain the displaced rubber.
Solution Approach 2:
The trough-shaped deepening acts as an intermediary structure between the spike body and the surrounding rubber material. It provides a designated space that mediates the interaction between the rigid spike and the elastic rubber, allowing the spike to be securely held while preventing harmful bulging that would reduce the contact area with the road.
2Reliability
If the spike body volume is larger than the spikel hole volume to ensure good spike seat, then the spike is securely held in the spikel hole, but the contact pressure between the running strip and the road is reduced
Solution Approach 1:
The trough-shaped deepening is pre-formed around the spikel hole to create a reserved volume that accommodates the displaced rubber material. By containing the rubber within this deepening, the original contact pressure distribution is maintained, and the harmful reduction in contact pressure caused by rubber bulging is prevented.
3Area of stationary object
If a trough-shaped deepening with volume matching the spike body volume is used, then the contact area and contact pressure are maintained, but the device complexity increases
Solution Approach 1:
The deepening is designed with specific volume parameters (0.9 to 1.1 times the spike body volume) and geometric characteristics (rounded edge area, spherical cap floor) to optimally contain the displaced rubber. By carefully controlling these parameters, the solution achieves the desired effect with a simple geometric modification rather than a complex mechanical structure.
Solution Approach 2:
The deepening features a rounded edge area and a floor in the form of a spherical cap, with a smooth transition between them. This curved geometry naturally accommodates the displaced rubber material and maintains structural simplicity while effectively preventing bulging that would reduce contact area.
Data Source
Figure 1~3
AI summary
The invention relates to a combination of a vehicle pneumatic tire and spikes (4), wherein the vehicle pneumatic tire has a tread with profile elements (1) each having at least one spike hole (3) with a spike hole volume Vspikehole for inserting a spike (4) with a spike body (5) having a spike body volume Vspikebody, wherein the spike body volume Vspikebody is larger than the spike hole volume Vspikehole. The spike hole (3) extends from the center of a trough-shaped depression (2) formed on the outer surface (1a) of the profile element (1), which tapers smoothly to the outer surface (1a) and which has a depression volume Vdepression, for which the following applies: Vdepression = Vspikebody − Vspikehole * f, where f is a factor, and f = 0.9 to 1.1.