Tyre Rim Mounting Carrier Block Pinch Impact Protection
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Solution Overview
Problem
Tires for all-terrain bicycles, particularly downhill and enduro bikes, face significant stress and damage from pinching shocks during jumps and impacts, leading to frequent ruptures at the crown and beads, which are often irreparable and result in tire scrapping.
Innovation Solution
The integration of a carrier block on the sidewall with specific geometric dimensions and positioning, which shifts the point of impact during a pinch event away from the critical area of the rim flange, distributing deformation energy more evenly and enhancing resistance to pinching impacts without significantly increasing the tire's mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tire uses traditional carcass reinforcement structures (single or multiple layers with upturns), then the tire maintains basic structural integrity and flexibility, but it is vulnerable to pinching shocks that cause crown and bead ruptures
Solution Approach 1:
The carrier block is pre-positioned on the bead before mounting the tire, creating a protective structure in advance that will intercept and distribute pinch impact forces before they reach critical areas like the crown and bead core, preventing catastrophic failures
Solution Approach 2:
The carrier block acts as an intermediary element between the rim and the tire crown/bead, absorbing and redistributing the concentrated pinch impact forces into distributed loads across a larger area, thereby protecting the vulnerable crown and bead regions from rupture
2Strength
If additional reinforcement layers or filling elements are added to the bead structure, then resistance to pinching impacts improves, but the tire mass increases significantly
Solution Approach 1:
Instead of uniformly reinforcing the entire tire structure, the carrier block provides localized reinforcement precisely at the bead region where pinch impacts are most damaging, achieving high resistance to pinching impacts without the need for extensive additional materials throughout the tire
Solution Approach 2:
The carrier block modifies the local structural parameters at the bead by introducing a specifically shaped reinforcement element with optimized dimensions and positioning, changing how forces are distributed locally without requiring global structural changes that would increase overall tire mass
3Strength
If the carrier block is positioned closer to the rim flange, then it better intercepts pinch impacts, but it may interfere with bead seating and inflation
Solution Approach 1:
The carrier block extends partially toward the rim flange to provide adequate protection against pinch impacts, but its dimensions are carefully controlled to provide just enough coverage without excessive extension that would interfere with bead seating and inflation operations
Data Source
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AI summary
Assembly (1) for a two-wheeled vehicle, comprising a tyre (2) of height H and a tread (3) connected by two sidewalls (4) to two beads (5), which is mounted on a rim (6) comprising two rim flanges (7) respectively having a radial height G and a circular radial end portion (8) of radius R1. Each bead (5), having a radially interior point I and being in contact with a rim flange (7), comprises a bearing block (9), on the axially outer face of each sidewall (4), extending radially from a first point A as far as a second point B radially on the outside of the first point A and axially as far as a third point C axially on the outside of the sidewall (4). The radial height hA between the first point A and the radially inner point I of the bead is ≤ 1.5 times the radial height G, the radial height hB between the second point B and the point I is ≥ 0.1 times the radial section height H, and the distance dc between the points A and C is ≥ 0.5 times the radius R1.