Cargo Bike Battery Placement for Front Wheel Stability
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Solution Overview
Problem
Cargo bicycles experience loss of controllability due to the front wheel lifting off the ground, posing a significant safety risk, especially when encountering bumps or curbs, due to a large wheelbase and rear-mounted saddle.
Innovation Solution
A cargo bicycle design with a battery positioned between two horizontally extending frame elements near the front wheel, increasing the contact load and stability, and optionally an additional battery placed close to the front wheel or fork element, with a housing providing protection and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bicycle frame has a large wheelbase and the saddle is arranged close to the rear wheel, then the cargo bike can accommodate large loads and provide stable seating, but the front wheel easily lifts off the ground when encountering bumps or curbs, resulting in loss of controllability
Solution Approach 1:
The patent applies the counterweight principle by positioning the heavy battery near the front wheel (within 50 cm horizontally and preferably within 20 cm) to create a balancing moment that counteracts the lifting effect of the large wheelbase and rear-mounted saddle. This strategic placement of mass restores front wheel contact with the ground during bumps, eliminating the safety risk while preserving the stable seating arrangement.
2Reliability
If the battery is positioned between the two horizontally extending frame elements, then the battery is protected in the event of a fall and the contact load on the front wheel is increased, but the battery may be subjected to vibration and potential overheating
Solution Approach 1:
The patent introduces vibration damping elements as intermediary components between the battery and the bicycle frame. These dampers absorb and dissipate vibration energy, protecting the battery from mechanical shocks while allowing it to remain positioned between the frame elements for optimal protection and front wheel contact load enhancement. This intermediary layer decouples the battery from direct frame vibrations.
Solution Approach 2:
The patent addresses temperature management by changing the thermal parameters of the battery environment. This includes providing active cooling systems or thermally conductive mounting structures that facilitate heat dissipation from the battery, maintaining acceptable operating temperatures despite the battery's protected position between frame elements.
3Force
If the additional battery is arranged close to the front wheel (less than 50 cm, preferably less than 30 cm, particularly preferably less than 20 cm), then the contact load on the front wheel is significantly increased, but the battery is more exposed to vibrations and mechanical stress
Solution Approach 1:
The patent positions vibration damping elements as intermediaries between the additional battery and the bicycle frame, absorbing mechanical stresses and vibrations. This allows the battery to be placed within 20 cm of the front wheel for maximum contact load enhancement while the dampers protect the battery from the harmful vibrational effects of this proximity.
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
Enhances the contact load on the front wheel, reducing the risk of it lifting off the ground and improving overall safety and stability, while protecting the battery and preventing overheating.
Implementation Method 1
The battery, which is relatively heavy for technical reasons, increases the contact load on the front wheel
Implementation Method 2
The battery and/or the additional battery is connected to the bicycle frame, in particular the carrier element, via elastic holding elements. Such an elastic holder allows the battery or the additional battery to move or swing within certain limits. This allows the battery or the additional battery to be used as a vibration damper.
Implementation Method 3
the battery and/or the additional battery is at least partially surrounded by a heat dissipation element. Such a heat dissipation element, in particular made of metal, can be connected to the bicycle frame in a thermally conductive manner. This easily prevents the batteries from overheating.
Data Source
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AI summary
A cargo bicycle has a bicycle frame (10) connected to a rear triangle (26) supporting at least one rear wheel (24) and a fork element (40) supporting at least one front wheel (42). The bicycle frame also has a support element (28) for receiving a cargo container, the support element (28) being arranged between a handlebar tube (18) and the fork element (40). Furthermore, the bicycle frame (10) supports a battery (44). The battery (54), which may comprise several individual battery cells, is arranged exclusively between the two frame elements (30) that comprise the support element.