E-Scooter Tire Sidewall Reflective Layout for Small-Diameter Visibility
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Solution Overview
Problem
E-scooter tires with small diameters (20 cm to 32 cm) pose a challenge in providing effective reflective areas for enhanced visibility, especially during twilight and nighttime, as traditional reflective designs are not suitable for their size.
Innovation Solution
The e-scooter tire features a reflective area on its side walls, with an outer diameter larger than 75% of the tire diameter, an inner diameter no more than 70%, a width of at least 5 mm, and an area of at least 3000 mm², applied via a reflective tape with a fabric backing containing at least 60% glass beads bonded with polyurethane resin, enhancing visibility and safety compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional reflective designs are used on small e-scooter tires, then the tire size constraint is maintained, but the visibility and perceptibility are insufficient
Solution Approach 1:
The patent applies reflective material specifically to the side wall portion of the tire at a defined angular position (10 to 30 degrees) rather than uniformly across the entire tire. This localized application optimizes visibility in critical areas while accommodating the small overall tire size, resolving the contradiction between limited surface area and required visibility intensity.
Solution Approach 2:
The patent defines specific dimensional parameters for the reflective area (outer diameter >75% of tire diameter, inner diameter ≤70% of tire diameter, width ≥5mm, area ≥3000mm²) to ensure adequate reflectivity on small tires. By changing and optimizing these geometric parameters, the solution achieves sufficient visibility despite the constrained tire size.
2Area of stationary object
If reflective coating is applied directly to the tire side wall, then the reflective area is achieved, but the application process is time consuming
Solution Approach 1:
The reflective material is pre-applied to a carrier element (tape or foil) before being attached to the tire. This preliminary preparation of the reflective layer separately allows for efficient production and application, reducing the time required during the actual tire assembly process while ensuring the required reflective area is achieved.
Solution Approach 2:
The patent introduces a carrier element (tape or foil) as an intermediary between the reflective material and the tire side wall. This intermediary allows the reflective material to be pre-fabricated and then easily applied to the tire, significantly reducing application time compared to direct coating methods while maintaining the required reflective surface area.
3Reliability
If the reflective area is made large enough to meet safety regulations, then the perceptibility is improved, but the available side wall space is limited
Solution Approach 1:
The patent optimizes the geometric parameters of the reflective area (positioning it at 10-30 degrees on the side wall, defining specific inner and outer diameter ratios) to maximize the usable side wall space. This parameter optimization allows the reflective area to meet the minimum 3000mm² requirement for safety compliance while fitting within the limited side wall area of small e-scooter tires.
Solution Approach 2:
The patent positions the reflective area in a specific angular dimension (10 to 30 degrees on the side wall) rather than only considering the radial dimension. This utilization of the angular dimension allows the reflective area to achieve sufficient size for safety compliance while efficiently using the available three-dimensional side wall space.
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
The solution provides improved perceptibility and safety for e-scooters by ensuring the reflective area meets UNECE Regulations, enhancing visibility during low-light conditions, and is easily applied using a pre-fabricated adhesive tape, optimizing reflectivity and physical properties.
Implementation Method 1
The tape further comprises a reflective material, the surface thereof comprising at least 60%, particularly even at least 80% glass beads forming the reflective area. The glass beads have a high reflectivity and are thus optimized as a reflective surface of the tape.
Data Source
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AI summary
The invention relates to an e-Scooter tire (50) having an outer diameter (dT) between 20 cm and 32 cm and comprising a rubber body (52) with a tread (54), side walls (56, 58) and beads (60), whereby the side walls (56, 58) comprise a reflective area (64). According to the invention a well perceptive reflective area (64) can be realized on such a small e-scooter tire by following characteristics: the outer diameter (do) of the reflective area is larger than 75% of the tire diameter (dT), the inner diameter (di) of the reflective area is at most 70% of the tire diameter (dT), the width (w) of the reflective area (64) is at least 5 mm, a side wall portion (62) of the side walls (56, 58) carrying the reflective area (64) extends within an angle range (α) of -30 to 30 degrees to the tire plane (P), and the size of the reflective area (64) is at least 3000 mm2 for each side wall (56, 58).