Blow-Molded Wheels With Undulating Treads For Obstacle Traversal
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Solution Overview
Problem
Conventional blow-molded wheels for children's ride-on vehicles have limited ability to engage and traverse various obstacles and surfaces due to their circular central circumferential region, which restricts their functionality on diverse terrains.
Innovation Solution
The development of blow-molded wheels with undulating treads, produced using a modified mold design that includes pinch-off rings with varying radii, allowing for a circumferential profile that changes radially along the circumference, enhancing traction and obstacle negotiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional blow-molded wheels with circular central circumferential regions are used, then the manufacturing process is simple and the wheel structure is uniform, but the ability to engage and traverse obstacles is limited
Solution Approach 1:
The wheel is segmented into multiple functional regions along its circumference: smooth run-flat regions for stable rolling and undulating tread regions with varying radii for obstacle engagement. This segmentation allows different portions of the wheel to perform specialized functions, improving overall adaptability to various terrains while maintaining a blow-molded construction approach
Solution Approach 2:
Different regions of the wheel are given different local qualities: the run-flat regions have a uniform first radius optimized for stable contact with flat surfaces, while the tread regions have a larger second radius that provides enhanced obstacle negotiation capability. This local differentiation of geometric properties enables the wheel to excel at both smooth rolling and obstacle traversal
2Reliability
If pinch-off rings with uniform circular geometry are used, then the manufacturing process is straightforward and the part line is centered, but the wheel has limited traction on diverse surfaces
Solution Approach 1:
The pinch-off rings are designed with asymmetric geometry, featuring alternating regions of first and second radii around the circumference. This asymmetric configuration creates the undulating tread pattern that provides varied traction characteristics for different surface conditions, moving away from the conventional symmetric circular design
Solution Approach 2:
The pinch-off rings incorporate varying curvatures along their circumference, with sections having a first radius and sections having a larger second radius. This variation in curvature creates the undulating tread profile that enhances mechanical engagement with obstacles and diverse surfaces while still being formable through blow-molding processes
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 undulating tread design improves the wheels' ability to engage and traverse obstacles, providing better traction and stability on different surfaces, enhancing the overall performance of children's ride-on vehicles.
Implementation Method 1
a pressurized gas, such as air, is used to force the molten plastic against the internal surface of the cavity
Implementation Method 2
After a brief cooling period, the mold portions are separated
Data Source
AI summary
Improved blow-molded wheels, methods for producing the same, and children's ride-on vehicles including the same are disclosed. The blow-molded wheels may include a blow-molded wheel body that is configured to rotate about an axis and has a tread surface that extends circumferentially around the wheel body and may have a circumferential profile that is defined as the locus of points at which the radial distance from the axis to the tread surface is greatest at each position around the circumference of the tread surface. The radial distance from the axis to the circumferential profile may change from a first radius to a second radius that is larger than the first radius at a plurality of spaced-apart positions along the circumferential profile. The method for producing the blow-molded wheels may include providing a mold with pinch-off rings that have an opening configured to form the circumferential profile.