Single-Wheel Recumbent Trailer Decoupled Steering
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Solution Overview
Problem
Existing bicycle trailers face issues with stability, maneuverability, and passenger safety, particularly when towing children, due to their design which can lead to unpredictable control of the bicycle and limited participation of passengers in propulsion, resulting in reduced travel distance and increased energy expenditure for the principal rider.
Innovation Solution
A single-wheeled recumbent bicycle trailer design that lowers the center of gravity, decouples steering input, and provides supportive seating with safety restraints, allowing passengers to contribute to propulsion while maintaining control for the principal rider, enhancing stability and mechanical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single rear wheel is used to reduce rolling friction and improve efficiency, then energy consumption decreases, but the trailer becomes less stable and more difficult to control
Solution Approach 1:
The patent introduces a decoupled steering mechanism that separates the steering input dimension from the propulsion dimension. The principal rider controls direction through a steering arm that pivots independently, while passengers pedaling provides forward motion without affecting steering. This dimensional separation allows single-wheel efficiency while maintaining controllability.
Solution Approach 2:
The patent employs a decoupled steering arm as an intermediary mechanism between the principal rider's control inputs and the trailer's direction. This intermediary allows the steering function to be independently controlled without being directly coupled to the propulsion system, enabling stable control despite the single-wheel configuration.
2Productivity
If passengers are allowed to participate in propulsion through pedaling, then travel distance increases, but control of the combined cycle becomes unpredictable
Solution Approach 1:
The patent segments the control functions by separating steering control (handled by the principal rider through the steering arm) from propulsion control (handled by passengers through pedaling). This segmentation allows passengers to contribute to movement without interfering with directional control, maintaining predictability while increasing productivity.
Solution Approach 2:
The decoupled steering mechanism acts as an intermediary that isolates the propulsion inputs from passengers from the steering control. When passengers pedal, their forces are transmitted to the wheel through the axle without being transmitted to the steering mechanism, preventing unpredictable control while allowing full participation in propulsion.
3Productivity
If an upright seating position is used to allow passenger participation in propulsion, then mechanical efficiency improves, but safety restraints become difficult to implement and passenger comfort decreases
Solution Approach 1:
The patent employs a dynamic recumbent seating position that allows passengers to pedal effectively while maintaining a lowered center of gravity. The seat configuration enables passengers to shift their weight and positioning to optimize both propulsion efficiency and safety, adapting to the dual requirements of mechanical efficiency and secure restraint.
Solution Approach 2:
The patent changes the seating dimension from upright to recumbent, which lowers the passenger's center of gravity and allows for effective pedaling motion. This dimensional change in seating posture enables both propulsion participation and improved safety through lower center of gravity and better restraint integration.
4Stability of the object's composition
If a wide two-wheeled design is used to provide stability, then straight line stability improves, but rolling friction and aerodynamic drag increase significantly
Solution Approach 1:
The patent employs an asymmetric single-wheel design that concentrates the support function in one wheel rather than distributing it across two wide-spaced wheels. This asymmetric configuration reduces the track width, thereby reducing rolling friction and aerodynamic drag while maintaining stability through the decoupled steering mechanism that compensates for the narrower base.
Data Source
AI summary
Embodiments of the present invention comprise a single-wheeled recumbent bicycle trailer which may be attached to a bicycle, for transport of a passenger or passengers, wherein the passengers may contribute to propulsion of the combined cycle. The embodiments include a recumbent seat position and other accommodations for the safety and comfort of passenger(s) and ease of use. Such accommodations may include single or multi-passenger configuration, passenger pedals, hands-free operation for passengers, supportive seats with backrests, extendable leg rests, and safety restraints.