Three-Wheeled Cargo Bike Chassis With Rotatable Bogie
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional three-wheeled cargo bike designs fail to achieve simple and comfortable operation with maximum loading space and a small width while maintaining a cost-effective and robust construction with a long service life.
Innovation Solution
A chassis with a swivel joint and rotatable bogie that allows the container to rotate with the steering movement, combined with a parallelogram gear for tilting, and a spring element to counteract inclination, enabling a large loading volume and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the container is rigidly attached to the frame or pivots with steering, then the transport volume can be large, but the handling characteristics and operation comfort deteriorate
Solution Approach 1:
The vehicle is divided into functionally independent modules: the container remains fixed to the frame while the bogie (wheel assembly) is separated and made rotatable. This segmentation allows the container to maintain large volume without compromising handling, as the steering movement is isolated to the bogie section rather than the entire container assembly.
Solution Approach 2:
The bogie is designed with rotational freedom about a pivot axis, transforming the static container-frame connection into a dynamic system where the wheel assembly can rotate independently. This dynamic capability enables the container to remain stable while the bogie adapts to steering requirements, improving operation comfort without reducing transport volume.
2Device complexity
If the pivot axis is positioned directly ahead of the front wheels, then the steering mechanism is simple, but the stability during straight-line driving deteriorates
Solution Approach 1:
The pivot axis is repositioned from a horizontal alignment (directly ahead of wheels) to a vertical alignment (above the front axle). This dimensional change in axis orientation creates a caster effect where the contact point trails behind the pivot projection, generating automatic restoring forces that enhance straight-line stability while maintaining steering functionality.
3Length of moving object
If the front section is designed to be low and extends below the cargo unit, then the overall length is short, but the structural robustness and service life deteriorate
Solution Approach 1:
The front section is transformed from a static low-extension design into a dynamic rotatable bogie assembly. The bogie can rotate about a vertical pivot axis positioned above the front axle, allowing the vehicle to achieve compact dimensions when stationary while maintaining structural integrity during operation. The rotational capability enables the system to adapt to different spatial requirements without compromising robustness.
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 solution provides a compact, stable, and easy-to-use cargo bike with a large container volume, enhanced cornering dynamics, and increased safety, allowing for efficient transportation through standard doorways and maintaining upright stability even when loaded.
Implementation Method 1
at least one spring element which is designed to generate a force counteracting the inclination for restoring the front wheel mounting devices in an inclined state
Implementation Method 2
The tracking point, i.e., the point where the pivot axis of the bogie intersects the road surface, lies in front of the wheel contact point. During steering maneuvers, an additional restoring torque is thus generated, which acts in the opposite direction to the steering movement and helps to return the front wheels to the straight-ahead position
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A chassis (10) for a three-wheeled vehicle is presented. This chassis comprises a pivot joint and a bogie (20) rotatably mounted thereon, on which a container (40) is arranged or can be arranged. The container rotates with the bogie (20) during steering movements. The chassis (10) also includes a steering gear (24) by which a steering movement of a handlebar (30) can be transmitted to the bogie (20).