Coaxial Rotating Step Surface for Compact Vehicle Entry
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Solution Overview
Problem
Fixed running boards occupy excessive space and require complex linkages, while stowable running boards are bulky, necessitating a need for an automated, ergonomic, and compact stepping surface solution.
Innovation Solution
A coaxial rotating automated stepping surface assembly with a motor and actuator system that allows the stepping surface to pivot and lock in various positions, providing rotational deployment and stowage, suitable for vehicles with limited space or ground clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fixed running boards are used, then stability and support are provided, but they occupy excessive space and have poor ergonomics
Solution Approach 1:
The running board is transformed from a fixed static structure to a dynamic deployable structure that can rotate between stowed and deployed positions. The coaxial rotation mechanism allows the running board to pivot about the same axis as the door, enabling it to adapt its position based on operational requirements while minimizing space occupation when not in use
2Volume of moving object
If stowable running boards are used, then space utilization is improved, but they become bulky and require complex linkages
Solution Approach 1:
The motor shaft and pivot axis are merged into a single coaxial arrangement, eliminating the need for separate actuation mechanisms and complex linkages. The running board assembly is integrated with the door structure, sharing the rotation axis and reducing overall package footprint while maintaining stowability
Solution Approach 2:
The motor serves dual functions as both the actuator for deploying the running board and the pivot mechanism for rotation. This multi-functional design eliminates the need for separate pivot linkages and reduces structural complexity while achieving both stowability and deployability
3Volume of moving object
If automated mechanisms are added for stowability, then space utilization improves, but device complexity and bulk increase
Solution Approach 1:
The motor is positioned such that its shaft coincides with the pivot axis of the running board, merging the actuation function and rotation function into a single component arrangement. This coaxial configuration eliminates the need for separate pivot linkages and reduces the overall mounting footprint
Solution Approach 2:
The motor provides both the rotational motion for deploying the running board and the pivot motion for positioning, serving multiple functions through a single actuator. This self-sufficient design reduces the need for additional mechanical components and simplifies the overall system
Data Source
AI summary
A coaxial rotating automated stepping surface assembly adapted for a vehicle, including, at least one stepping surface portion, single pivot axis, coaxial motor arrangement to pivot axis, and complete system packaging out board of sill structure. The motor is a non back-drivable motor and is capable of operably self-locking in predetermined positions.