Motorized Bicycle Drive with Unidirectional Power Transmission
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Solution Overview
Problem
Existing motorized driving devices for bicycles require extensive modifications to the frame structure, making them inconvenient for installation on standard bicycles and limiting their compatibility with existing models.
Innovation Solution
A motorized driving device with a power transmission mechanism that includes unidirectional power transmission modules and sensors, allowing for independent control of pedal power and motor power, which can be easily installed on a bicycle without altering its frame structure, using an inner sleeve and screw system for mounting and a sensor module to adjust motor assistance based on pedal speed and torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If known motorized driving devices are installed on bicycles, then motor auxiliary power can be provided to reduce workload, but extensive modification of the frame structure is required
Solution Approach 1:
The motor, battery, and control components are nested within an integrated housing unit that mounts to the bicycle frame without requiring frame modifications. The power transmission mechanism is nested within the same housing, creating a compact self-contained module that attaches to existing bicycle structures.
Solution Approach 2:
The mounting mechanism uses a universal interface system with adjustable mounting brackets and standardized connection points that can accommodate various bicycle frame types. The power transmission mechanism universally interfaces with both pedal drive and chainwheel systems.
2Power
If extensive frame structure modifications are made to install motorized devices, then motor power can be transmitted to the chain, but the device becomes incompatible with standard bicycles
Solution Approach 1:
The mounting brackets are designed with adjustable positioning and multiple attachment configurations to fit various frame geometries. The power transmission mechanism uses universal interfaces that work with both traditional pedal drives and modern chainwheel systems, making the device compatible with standard bicycles without frame modifications.
Solution Approach 2:
The mounting system incorporates adjustable and reconfigurable components that can adapt to different bicycle frame types. The mounting brackets can be repositioned along the frame tubes, and the connection points are designed to accommodate variations in frame geometry while maintaining secure power transmission.
3Power
If the pedal drive mechanism and motor are coupled through a complex transmission system, then power can be transferred to the chain, but the independent control of pedal power and motor power is lost
Solution Approach 1:
A one-way clutch mechanism acts as an intermediary between the pedal drive and chain, allowing motor power to be transmitted to the chain independently of pedal power. The one-way clutch engages when motor torque is applied and disengages when only pedal power is present, enabling independent control of the two power sources while maintaining a relatively simple transmission system.
Data Source
AI summary
The present invention discloses a motorized driving device for mounting on a frame of a bicycle. The bicycle includes a pedal drive mechanism coupled to a chain for transferring a drive force to at least one chainwheel. The drive device includes a power source of rotary power and a power transmission mechanism for coupling between the pedal drive mechanism and the chain. The power transmission mechanism further includes a first unidirectional power transmission module and a second unidirectional power transmission module, such that an auxiliary power transmitted by the power transmission mechanism from the power source to the chain is independent from an pedal power transmitted by the power transmission mechanism from the pedal drive mechanism to the chain. A method of installing a motorized driving device on a standard bicycle is also disclosed. The motorized driving device in the present invention is suitable for installing on the frame of any ordinary bicycle, without having to alter the frame structure of the bicycle.