Three-Wheeled Cycle Steering and Suspension for Rough Terrain
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Solution Overview
Problem
Current human-powered cycles, such as mountain bikes, cargo bikes, and recumbent tricycles, face challenges in stability and safety on rough terrain and uneven surfaces, particularly when carrying loads, as they lack the cargo-carrying capabilities and control of a pick-up truck, and are difficult to maneuver on deep sand or snow.
Innovation Solution
A three-wheeled cycle design with two front wheels and a rear wheel, incorporating suspension and a steering assembly that allows for upright riding, with shock absorbers on both front and rear wheels, and optional power assist, enabling stability and traction on uneven surfaces and the ability to carry cargo, similar to a modern pick-up truck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mountain bikes are used for off-road activity, then they can traverse rough terrain, but they lack cargo carrying capabilities and are difficult to control at low speeds
Solution Approach 1:
The vehicle is segmented into three wheels with two positioned at the front and one at the rear, allowing independent suspension systems for each wheel. This segmentation enables the front wheels to handle rough terrain while the third wheel provides stability at low speeds, resolving the contradiction between terrain capability and low-speed control
Solution Approach 2:
The invention transitions from a two-wheeled to a three-wheeled configuration, adding a dimension of stability. The two front wheels provide terrain adaptability while the rear wheel adds longitudinal stability, enabling both off-road capability and easy low-speed control without requiring rider balance techniques
2Stability of the object's composition
If fat-tire bikes are used to float on loose surfaces, then stability on sand and snow improves, but rolling resistance increases requiring crawl speed
Solution Approach 1:
The vehicle uses two separate front wheels with fat tires instead of one large wheel, distributing the weight and allowing better weight distribution to reduce rolling resistance while maintaining the floating effect on loose surfaces. The three-wheel configuration also allows for more efficient power transfer to the ground
Solution Approach 2:
The suspension system dynamically adjusts to terrain conditions, allowing the fat tires to maintain optimal contact with the ground. The independent suspension on each wheel absorbs shocks and maintains traction, reducing energy loss from wheel slippage and bouncing on loose surfaces
3Stability of the object's composition
If recumbent three-wheeled cycles are used for stability, then low-speed stability improves, but hill climbing capability decreases due to rider position
Solution Approach 1:
The vehicle uses an asymmetric wheel configuration with two front wheels and one rear wheel, combined with an upright rider position. This asymmetry allows the rider to maintain power-generating posture while the two front wheels provide the stability of a tricycle, resolving the contradiction between stability and power output
4Quantity of substance
If cargo bikes are used to carry loads, then cargo carrying capability improves, but stability and control deteriorate due to weight distribution
Solution Approach 1:
The three-wheel configuration with two front wheels provides a wider base of support, improving lateral stability when carrying cargo. The separate front wheel assemblies with independent suspension allow for better weight distribution and handling, maintaining stability and control even with heavy loads
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 design provides enhanced stability and control on rough terrain, allowing riders to traverse challenging surfaces while carrying loads, with improved low-speed stability and the ability to generate torque for hill climbing, thus addressing the limitations of existing cycles.
Implementation Method 1
The front suspension incorporates spring elements that can be independently adjusted for softness or firmness
Implementation Method 2
The front suspension incorporates spring elements and can include shock absorbing elements
Implementation Method 3
enabling stability and traction on uneven surfaces
Data Source
AI summary
A three-wheeled cycle is provided that can be ridden in an upright position. The cycle can have a suspension system for traversing rough terrain and for traction when turning. The front wheels can have a steering assembly comprised of a two-piece steering arm that clamps the handlebar to the front fork and connection rod with linkage pins. Furthermore, the design of the cycle can be favorable for transport of additional cargo loads.