Drive Wheel Support Arm for Stable Caster-Free Mobility
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Solution Overview
Problem
Existing drive units attached to mobile objects without a drive source, such as carts, face issues where the wheel pressure does not sufficiently act on the drive wheel due to distribution of pressing load to a caster, affecting stability and mobility.
Innovation Solution
A drive unit configuration featuring a slantly extending support arm with a pivotable mechanism that urges the drive wheel toward the road surface, eliminating the need for a caster by ensuring adequate wheel pressure application, comprising an upper unit, a drive wheel, a drive source, a support arm, and an urging mechanism, like an elastic member, to enhance freestanding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a caster is added to distribute the pressing load, then the stability of the drive unit is improved, but the wheel pressure on the drive wheel is reduced
Solution Approach 1:
The invention extracts and removes the caster from the drive unit configuration. By eliminating the caster that was distributing the pressing load, the entire pressing load is concentrated on the drive wheel, ensuring sufficient wheel pressure while maintaining stability through the slanting support arm design.
Solution Approach 2:
The invention introduces a slanting support arm that extends downward at an angle from the upper unit. This dimensional change in the support structure creates a mechanical advantage that concentrates the pressing load vertically onto the drive wheel while the slanting geometry provides lateral stability, resolving the contradiction between stability and wheel pressure.
2Force
If the pressing load is concentrated on the drive wheel, then the wheel pressure is improved, but the freestanding stability is reduced
Solution Approach 1:
The slanting support arm extends downward at an angle rather than vertically. This angular configuration creates a horizontal stabilizing component that prevents tipping while the vertical component concentrates the pressing load on the drive wheel, simultaneously achieving both wheel pressure and freestanding stability.
Solution Approach 2:
The slanting support arm acts as a counterbalancing structure that resists tipping forces. The angled geometry creates a mechanical lever arm that counteracts destabilizing moments, providing freestanding stability while allowing full pressing load concentration on the drive wheel.
3Stability of the object's composition
If a caster is used for stable traveling, then the freestanding stability is improved, but it becomes unnecessary for the drive wheel to receive sufficient wheel pressure
Solution Approach 1:
The invention removes the caster from the system entirely. The slanting support arm configuration provides sufficient stability without requiring a caster, while concentrating the full pressing load on the drive wheel to ensure adequate wheel pressure for effective mobility and productivity.
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
This configuration allows for sufficient wheel pressure application to the drive wheel, enhancing freestanding stability and preventing tilting or falling during travel, even without a caster, thereby improving mobility and stability.
Implementation Method 1
The urging mechanism is an elastic member
Data Source
AI summary
It is intended to sufficiently apply a wheel pressure to a drive wheel. An upper unit is configured to be attached to a mobile object. A drive wheel is disposed to be movable in an up-and-down direction with respect to the upper unit. A drive source is configured to drive the drive wheel. A support arm is pivotably attached to the upper unit. The support arm extends slantingly downward from the upper unit. The support arm supports the drive wheel. An urging mechanism urges the support arm downward.