Mobility Wheel Tilting Structure Without Actuator Rollover Control
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Solution Overview
Problem
Personal mobility devices with high centers of gravity are prone to rollover during turning, requiring complex and weight-increasing actuator systems for wheel tilting, which are not feasible due to increased weight and cost.
Innovation Solution
A simple tilting structure for mobility devices without an actuator, featuring a base frame, tilting bar, front and rear wheel rotation gears, and steering mechanisms that allow intuitive tilting of front and rear wheels in conjunction, maintaining stability without additional weight or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate actuator is mounted to tilt wheels during turning, then driving stability is improved, but weight and device complexity increase
Solution Approach 1:
The patent combines the wheel tilting function with the existing steering mechanism by integrating a tilting bar that connects both front wheel frames to the base frame. This merging eliminates the need for separate actuators while achieving the desired wheel tilting for improved driving stability during turning.
Solution Approach 2:
The tilting bar serves multiple functions: it connects the front wheel frames to the base frame, enables simultaneous tilting of both front wheels, and integrates with the steering mechanism. This multi-functionality reduces the need for additional components and maintains simplicity while improving stability.
2Reliability
If a separate actuator is mounted to tilt wheels during turning, then driving stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the wheel tilting function with the existing steering mechanism by integrating a tilting bar that connects both front wheel frames to the base frame. This merging eliminates the need for separate actuators while achieving the desired wheel tilting for improved driving stability during turning.
Solution Approach 2:
The tilting mechanism utilizes the existing steering motion to automatically tilt the wheels through the tilting bar's geometric configuration. The system serves itself by converting the steering rotation into wheel tilting without requiring external actuators or additional control systems.
3Reliability
If wheel tilting is implemented during turning, then roll-over is prevented, but cost increases due to complex structure
Solution Approach 1:
The patent combines the wheel tilting function with the existing steering mechanism by integrating a tilting bar that connects both front wheel frames to the base frame. This merging eliminates the need for separate actuators while achieving the desired wheel tilting for improved driving stability during turning.
Solution Approach 2:
The tilting mechanism uses simple mechanical components (tilting bar, connection links, gears) that can be manufactured at low cost compared to electronic actuators. The design prioritizes simplicity and manufacturability while achieving the safety function of roll-over prevention.
Data Source
AI summary
A tilting structure of a mobility device and the mobility device including same, may include a base frame; front wheel frames mounted on opposite front sides of the base frame and coupled to the base frame through front wheel shift gear portions extending in vertical directions; a tilting bar coupled to the base frame to be tiltable transversely with respect to a tilting center, with a first side of the tilting bar being branched and extending to opposite sides; and front wheel rotation gears engaged to opposite end portions of the tilting bar, respectively, to be rotated in the same direction that tilting bar is tilted, and engaged with the front wheel shift gear portions and rotated and thus moving the front wheel shift gear portions relative to each other in the vertical directions with respect to the base frame.