Bicycle Drive Mounting Assembly with Elastomer Damping
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Solution Overview
Problem
Bicycles equipped with electric motors experience vibrations that are transferred to the frame, leading to uncomfortable noise, especially when the vibrations align with the frame's resonance frequency, making it difficult to coordinate the bicycle drive with the frame to reduce noise effectively.
Innovation Solution
A fastening arrangement that includes a damping element between the bicycle drive and the frame, which can be designed as an elastic element, such as an elastomer or rubber, to absorb vibrations and reduce noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bicycle drive system is rigidly mounted to the frame, then the structural stability and power transmission are improved, but the vibration transmission and noise increase
Solution Approach 1:
A damping element is introduced as an intermediary component between the drive system mounting flange and the frame. This damping element serves as a mediator that allows the drive system to be securely mounted while simultaneously reducing the transmission of vibrations and noise to the frame, thus resolving the contradiction between structural stability and vibration transmission.
Solution Approach 2:
The mounting arrangement uses a composite structure combining a rigid mounting flange for structural stability with a damping element made of vibration-damping material. This composite approach allows the rigid and damping properties to coexist, maintaining structural integrity while reducing vibration transmission to the frame.
2Power
If the bicycle drive system is rigidly mounted to the frame, then the power transmission efficiency is improved, but the structure-borne noise increases
Solution Approach 1:
The damping element acts as an intermediary that does not interfere with power transmission but selectively attenuates vibration frequencies that cause structure-borne noise. This allows efficient power transmission from the drive system to the drivetrain while reducing noise propagation to the frame and rider.
Solution Approach 2:
The damping element changes the vibrational parameters by altering the frequency and amplitude of vibrations transmitted to the frame. It modifies the vibration characteristics to reduce noise while maintaining the necessary power transmission path, thus resolving the contradiction between power efficiency and noise generation.
3Weight of moving object
If the bicycle frame is designed with hollow structure for weight reduction, then the weight is reduced, but the frame acts as a sound amplifier
Solution Approach 1:
The damping element serves as a mediator between the drive system and the hollow frame structure. It prevents the frame from acting as a sound amplifier by blocking the transmission path of vibrations before they can be amplified by the hollow frame geometry, thus maintaining the lightweight design while preventing noise amplification.
4Object-generated harmful factors
If the damping element is added between the drive system and frame, then the vibration transmission is reduced, but the device complexity increases
Solution Approach 1:
The damping element is merged with the mounting flange assembly, where the damping element is positioned between the mounting flange and the frame. This integration combines the mounting function and vibration damping function into a single compact assembly, reducing the overall complexity despite adding damping capability.
Solution Approach 2:
The mounting flange assembly serves multiple functions: it provides structural mounting for the drive system, transmits power, and simultaneously acts as a vibration damping interface. This multi-functionality reduces the need for separate damping components, thereby limiting the increase in device complexity while achieving vibration reduction.
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 damping element effectively reduces the transmission of vibrations from the bicycle drive to the frame, thereby minimizing noise and enhancing the riding experience by decoupling the bicycle drive acoustically from the frame.
Implementation Method 1
The damping element can be designed to dampen the transmission of vibrations from the bicycle drive to the bicycle frame
Implementation Method 2
The damping element is, for example, designed as an elastic element
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a fastening arrangement for attaching a bicycle drive (22) to a bicycle frame (10). The fastening arrangement comprises a fastening element (40) and a damping element (42). The damping element (42) is arranged between the fastening element (40) and a retaining element. The retaining element is configured as a bicycle frame (10) or bicycle drive (22). The invention also relates to a bicycle.