Electric Bicycle Pedal Clutch for Powered Reverse Motion

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Solution Overview

Problem

Existing bicycles and tricycles lack the ability to move in reverse under pedal power and require manual scooting when backing up, and gasoline-powered options are declining in use.

Innovation Solution

An electric bicycle design featuring a rear wheel assembly with a solid, spokeless construction, rotatable pedals that can switch between engaged and disengaged configurations, and an electric motor that can rotate the rear axle in both forward and reverse directions, allowing for both manual and powered modes of operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional pedal propulsion is used, then forward motion is achieved, but reverse motion is not possible without manual scooting

Engineering Contradiction:

Improvereverse motion capabilityVSAvoidmanual scooting requirement

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The pedal assembly is designed with dynamic engagement/disengagement capability, allowing it to switch between connected and disconnected states with the rear axle. This enables the pedals to function in multiple modes: engaged for forward propulsion, disengaged for reverse motion assistance, and selectively engaged for electric motor operation only.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The pedal assembly serves multiple functions: it can propel the bicycle forward when engaged with the rear axle, allow reverse motion when disengaged, and selectively engage with the electric motor to enable powered operation. This multi-functionality eliminates the need for separate mechanisms for forward motion, reverse motion, and powered assistance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If pedals are permanently engaged with the rear axle, then continuous forward propulsion is possible, but electric motor engagement is restricted

Engineering Contradiction:

Improveforward propulsion capabilityVSAvoidelectric motor engagement

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The pedal assembly incorporates a dynamic engagement mechanism that allows it to connect to or disconnect from the rear axle as needed. This enables the system to switch between manual pedaling mode (pedals engaged with rear axle), electric motor-only mode (pedals disengaged from rear axle), and hybrid mode (selective engagement).

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If pedals are disengaged from the rear axle, then electric motor can rotate the rear axle freely, but manual pedaling is not possible

Engineering Contradiction:

Improveelectric power modeVSAvoidmanual pedaling capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The pedal assembly is designed with a dynamic engagement mechanism that allows the user to connect or disconnect the pedals from the rear axle. When engaged, manual pedaling is enabled; when disengaged, electric motor operation is enabled. This dynamic switching capability allows the system to adapt to different operating modes as needed.

Inventive Principle:

Principle #15Dynamics

4Power

If gasoline engine is used, then powered motion is achieved, but environmental concerns and declining popularity occur

Engineering Contradiction:

Improvepowered motion capabilityVSAvoidenvironmental impact

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The invention replaces the gasoline engine (mechanical/chemical system) with an electric motor (electrical system). This substitution eliminates harmful emissions and aligns with environmental concerns while providing the same powered motion capability. The electric motor can be engaged with the rear axle to provide powered propulsion without the negative environmental impacts of gasoline engines.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables seamless switching between manual pedaling and electric power modes, providing forward and reverse motion without the need for manual scooting, while eliminating the need for gasoline engines.

Implementation Method 1

An electric motor is mounted on the rear wheel assembly, electrically coupled to a battery, and configured to engage with the rear axle

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

the at least two pedals are engaged with the rear axle and configured to rotate the rear axle in a forward direction

Methodology Applied

Scientific EffectMechanical force transmission: Mechanical Force

Data Source

PatentUS12434784B2Electric bicycle

Publication Date: 2025.10.07 ROBERTS JONATHAN D

AI summary

An electric bicycle including a frame having a front end coupled to a steering assembly, the steering assembly having a front wheel, and a rear end coupled to a rear wheel assembly, the rear wheel assembly having a rear wheel. At least two pedals rotatably coupled to the rear wheel assembly, the at least two pedals having an engaged configuration wherein the at least two pedals are engaged with the rear wheel and configured to rotate the rear wheel in a forward direction, and a disengaged configuration wherein each of the at least two pedals is disengaged from the rear wheel. An electric motor electrically coupled to a battery and configured to engage with the rear wheel and to rotate the rear wheel in the forward direction.