Spherical Omnidirectional Wheel Assembly for Terrain Adaptability
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Solution Overview
Problem
Existing wheel designs for enabling object movement in multiple directions face challenges such as torque orientation issues, space requirements, material durability, and effectiveness on uneven terrain, with prior art solutions like caster wheels, ball casters, omni wheels, and Mecanum wheels having limitations in stability, complexity, and terrain adaptability.
Innovation Solution
A wheel assembly with a shaft having angled portions for three axes of rotation, comprising a central shaft with end portions defining one axis, a hub connected to the shaft for another axis, and hemispherical members rotating around a third axis, allowing omni-directional movement without the need for additional rollers and reducing complexity and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a caster wheel arrangement is used, then object movement is enabled, but torque of variable orientation is applied to the object and larger space is required
Solution Approach 1:
The patent employs a spherical wheel design where the contact point with the ground always aligns vertically with the rotation axis. This spherical geometry eliminates the horizontal offset present in conventional caster wheels, allowing the wheel to rotate freely in any direction without requiring additional clearance space, thus resolving the contradiction between movement capability and space requirement.
2Adaptability or versatility
If a ball caster is used, then omni-directional rotation is achieved, but the ball is sensitive to scratches and contaminants increasing friction
Solution Approach 1:
The patent utilizes a composite wheel structure combining a spherical wheel body made from durable, low-friction material with a separate bearing mechanism. This composite approach allows the spherical geometry to provide omni-directional rotation while the bearing system handles the friction and wear issues, preventing the reliability problems associated with simple ball casters that are directly exposed to scratches and contaminants.
3Adaptability or versatility
If omni wheels or Mecanum wheels are used, then movement in multiple directions is enabled, but effectiveness on uneven ground surfaces is reduced
Solution Approach 1:
The spherical wheel design inherently provides superior adaptability to uneven terrain compared to omni wheels or Mecanum wheels. The spherical geometry allows the contact point to naturally adjust to surface irregularities, maintaining stable contact and effective rolling motion across varied ground surfaces, whereas the smaller rollers in omni and Mecanum wheels cannot effectively navigate terrain irregularities.
4Adaptability or versatility
If a spherical wheel is used, then ideal omni-directional movement is achieved, but the connection member cannot pass through the sphere surface without impacting rotation
Solution Approach 1:
The patent segments the spherical wheel system into distinct functional components: the spherical wheel body, a separate bearing mechanism, and a connection member. The bearing mechanism is positioned to allow the connection member to attach to the sphere's center without passing through the spherical surface, thus preserving the spherical geometry's rotational freedom while enabling secure mechanical connection to the object being moved.
5Adaptability or versatility
If two hemispherical members are used, then rolling in two orthogonal directions is achieved, but increasing rotational speed is required as the axis approaches vertical position
Solution Approach 1:
The patent employs a complete spherical wheel design rather than two separate hemispherical members. This single spherical geometry provides true omni-directional rolling capability in all directions simultaneously, eliminating the asymptotic speed relationship that occurs with hemispherical members. The spherical shape maintains constant rolling radius and smooth motion characteristics regardless of the direction or angle of movement, avoiding the need for increasingly high rotational speeds as the axis approaches vertical position.
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 wheel assembly provides stable, omni-directional movement with reduced complexity and space requirements, improved terrain adaptability, and enhanced durability, addressing the limitations of prior art designs by enabling unhindered rotation and effective movement on uneven surfaces.
Implementation Method 1
two hemispherical members rotatably connected to the hub for rotation around a third axis perpendicular to the second axis
Data Source
AI summary
A wheel assembly comprising a shaft configured for rotatable connection to an object to be rendered mobile for rotation around a first axis, a hub rotatably connected to the shaft for rotation around a second axis, and two hemispherical members rotatably connected to the hub for rotation around a third axis. The shaft comprises at least one angled portion to define the first axis while the non-angled portion defines the second axis.