Pneumatic Tyre Shoulder Incision for Wet Grip and Rigidity
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Solution Overview
Problem
Pneumatic vehicle tires face a challenge in balancing good dry handling properties with good wet handling properties, particularly at high speeds, as fine circumferential grooves for water drainage reduce transverse rigidity and power transmission.
Innovation Solution
A design featuring an incision extending over the tire's circumference with a radially inner through-channel and a radially outer fine incision, where the incision walls are inclined to improve water drainage and transverse rigidity, ensuring effective water introduction into the through-channel and enhanced grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine circumferential grooves are formed in the outer shoulder area for water drainage, then wet handling properties are improved, but transverse rigidity and power transmission are reduced
Solution Approach 1:
The incision design implements local quality by creating different structural characteristics in different radial zones: a narrow fine incision in the radially outer area (extension height Ha) to maintain transverse rigidity, and a wide through-channel in the radially inner area (extension height Hi) to maximize water drainage. This localized differentiation allows each zone to optimize its function while resolving the contradiction between wet handling and transverse rigidity.
2Strength
If fine circumferential grooves are formed with reduced depth to avoid cutting into the tread base, then transverse rigidity is maintained, but water drainage capacity is reduced
Solution Approach 1:
The incision design transitions from a two-dimensional surface groove to a three-dimensional multi-zone structure by extending radially inward with different widths at different depths. The narrow fine incision at the surface (Ha) transitions to a wide through-channel at depth (Hi), creating a volumetric drainage path that enhances water removal capacity while preserving surface transverse rigidity.
3Reliability
If the incision extends deeply into the tread base to improve water drainage, then wet handling is improved, but the effective grip edge length is reduced
Solution Approach 1:
The incision is segmented into distinct functional zones: a narrow fine incision zone (Ha) at the radially outer area that preserves grip edge length and transverse rigidity, and a wide through-channel zone (Hi) at the radially inner area that provides deep water drainage. This segmentation allows the drainage function to be concentrated in the inner zone without compromising the outer grip edge.
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
Disclosed is a pneumatic vehicle tyre comprising a tread having grooves (5, 6, 7) and profile strips (1, 2, 3, 4) that extend along the entire tyre circumference. An extended slit (12) is formed in at least one profile strip (1) along the entire circumference and consists of a radially internal passage conduit (19) of radial extension height Hi and conduit width Bi, and of a radially external sipe (22) of radial extension height Ha and constant sipe width B2, where B2 < Bi. The sipe (22) is extended in its radially external extension region (21) in a v-shape at a width B3 that increases continuously towards the radially external surface (18). The profile strip (1) is formed by the outer shoulder OU of the tyre. The passage conduit (19) and the internal extension region (20) of the sipe (22) run along the entire tyre circumference in a straight line. The edges of the slit walls (23, 24) and the surface (18) form an angle of inclination Y in conjunction with the tyre circumference direction.