Retractable Step Three-Bar Linkage Space Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fixed running boards on motor vehicles are often impractical for users due to height issues, prone to dirt and mud accumulation, and reduce ground clearance, while retractable four-bar link systems occupy excessive space under the vehicle.
Innovation Solution
A step assembly utilizing a three-bar linkage with a single arm pivotal to both the upper housing and the step, allowing for movement between stowed and deployed positions, reducing space requirements and maintaining ground clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a four-bar link system is used for retractable steps, then the step can be moved between stowed and deployed positions, but the system occupies excessive space under the vehicle
Solution Approach 1:
The patent extracts one member from the traditional four-bar linkage system, reducing it to a three-bar linkage. This removes unnecessary complexity and space requirements while retaining the essential functionality of moving the step between stowed and deployed positions. The single arm pivotal with respect to both the upper housing and the step achieves the same operational effect with fewer components.
Solution Approach 2:
The three-bar linkage system segments the movement function into two pivotal connections: one between the arm and upper housing, and another between the arm and the step. This segmentation allows for more compact arrangement under the vehicle compared to the four-bar system, reducing the overall volume occupied while maintaining full operational capability.
2Ease of operation
If fixed running boards are used, then user support is provided, but ground clearance is reduced and the vehicle is susceptible to damage during off-road operation
Solution Approach 1:
The patent transforms the static fixed running board into a dynamic retractable step system. The step can be deployed when needed for user support and retracted when not in use, allowing the vehicle to maintain full ground clearance and off-road capability. The three-bar linkage enables this dynamic transition between stowed and deployed states, providing both user support and reliability.
3Ease of operation
If fixed running boards are used, then user support is provided, but dirt and mud accumulation occurs that can be transferred to user clothing
Solution Approach 1:
The retractable step system dynamically transitions between stowed and deployed positions, allowing the step to be retracted away from the ground when not in use. This prevents contact with dirt and mud, eliminating the accumulation problem that plagues fixed running boards. The three-bar linkage enables this dynamic positioning to keep the step clean when not actively supporting users.
Solution Approach 2:
By extracting the step from its fixed position on the ground, the system removes the step from the harmful environment of dirt and mud accumulation. The step is taken out and stored in the stowed position under the vehicle, preventing exposure to contaminants while still being readily deployable when needed for user support.
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 three-bar linkage system provides a practical, space-efficient, and clean solution for motor vehicle steps, enhancing user accessibility and reducing the risk of damage during off-road use by minimizing space occupation and preventing dirt accumulation.
Implementation Method 1
A single arm is pivotal with respect to the upper housing and pivotal with respect to the step in order to form a three-bar linkage for moving the step between the stowed and deployed positions
Data Source
AI summary
A step assembly includes an upper housing adapted to be fixedly secured to the motor vehicle. A step is movable relative to the upper housing between a stowed position and a deployed position. A single arm is pivotal with respect to the upper housing and pivotal with respect to the step in order to form a three-bar linkage for moving the step between the stowed and deployed positions.