Lever-Based Trailer Braking Kit for E-Bikes
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Solution Overview
Problem
Light personal vehicles, such as bicycles and e-bikes, lack sufficient braking power when towing heavier trailers, leading to increased stopping distances and safety risks due to the overload on their braking systems, and existing surge-braking systems require specialized tow bars and extensive brake cables, limiting versatility.
Innovation Solution
A system that allows a vehicle trailer and tow bar to be interconnected in either a braking or non-braking configuration using a lever-based braking subsystem with a fulcrum and spring mechanism, where the lever pivots to actuate brakes at the trailer wheels only when a threshold force is applied, eliminating the need for specialized tow bars and extensive brake cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the vehicle's braking system is used to brake the trailer, then the braking system can be simple, but the braking power is insufficient for heavier loads
Solution Approach 1:
The trailer's braking system uses the trailer's own momentum and kinetic energy to activate the brakes through the lever mechanism, eliminating the need for an external power source or complex actuation system. The system serves itself by converting the trailer's motion into braking force.
Solution Approach 2:
The braking system transitions from a static connection to a dynamic lever-based mechanism that automatically activates based on the trailer's motion and load conditions. The lever pivots between different positions to engage or disengage braking, adapting to varying towing conditions.
2Power
If a specialized tow bar with sprung piston is used for surge braking, then braking power is increased, but the tow bar cannot be used for non-braking configuration
Solution Approach 1:
The lever-based braking subsystem can operate in multiple modes: engaged to provide surge braking, disengaged for non-braking towing, or adjusted for different load conditions. The same connection interface and lever mechanism serve both braking and non-braking configurations.
Solution Approach 2:
The braking function is separated into a distinct lever-based subsystem that can be independently engaged or disengaged from the tow bar connection. This segmentation allows the tow bar to maintain its primary towing function while the lever subsystem provides optional braking capability.
3Ease of operation
If brake cables extend from the vehicle seat post to the trailer brakes, then braking can be actuated, but the system requires extensive cabling and specialized tow bar
Solution Approach 1:
The braking actuation mechanism is extracted from the vehicle and relocated to the trailer itself. The lever and fulcrum system is mounted on the trailer, eliminating the need for long brake cables extending from the vehicle's seat post to the trailer.
Solution Approach 2:
The lever acts as an intermediary mechanism between the tow bar connection and the trailer brakes. Instead of direct cable transmission from the vehicle, the lever converts the mechanical force from the tow bar into brake actuation at the trailer wheels.
4Reliability
If the vehicle's braking system is used alone, then the system remains simple, but stopping distance increases unsafely with heavier loads
Solution Approach 1:
The lever-based braking system provides a counterbalancing braking force that opposes the excessive momentum of heavy trailer loads. The fulcrum mechanism acts as a mechanical advantage system that multiplies the braking force available from the trailer's own motion.
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
This solution provides a compact and versatile braking system that can be installed on the trailer, allowing safe towing of heavier loads without modifying the vehicle or tow bar, ensuring effective braking without unnecessary activation at lower forces and maintaining non-braking functionality when needed.
Implementation Method 1
the spring resists pivoting of the lever about the lever fulcrum until at least a threshold amount of rearward force has been applied
Implementation Method 2
causes the lever to pivot about the lever fulcrum while being retained by the connection interface thereby to move the distal end of the lever and actuate the at least one brake
Implementation Method 3
at least one brake associated with the distal end of the lever and with a respective wheel of the trailer
Data Source
AI summary
A system, generally for use with light personal vehicles such as bicycles or e-bikes, for enabling a vehicle trailer and a tow bar to be interconnected in either a braking configuration or a non-braking configuration, is described. Also described is a braking kit for interconnecting a tow bar and a vehicle trailer in a braking configuration, wherein the vehicle trailer comprises a connection interface dimensioned to be connected with an end of the tow bar in a non-braking configuration. When the tow bar and the trailer are interconnected in the braking configuration, at least a threshold amount of rearward force imparted via the tow bar during vehicle braking causes the actuation of at least one brake associated with the trailer wheels. The same tow bar can be used in either braking or non-braking configuration.