Bicycle Clutch Opening Mechanism for Shifting Under Load
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Solution Overview
Problem
Existing bicycle gear shifting systems, particularly those with auxiliary drives, face challenges in maintaining efficient shifting under load due to high wear, maintenance requirements, and unfavorable weight distribution, as well as difficulties in shifting without interrupting pedaling.
Innovation Solution
A clutch device with a first opening device spatially separated from the torque transmission region, utilizing operating torque to assist in opening the clutch, and a second opening device for low-load conditions, allowing independent construction optimization and enabling smooth gear shifts under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional clutch mechanisms are used for gear shifting, then the structure is simple, but shifting under load is difficult due to high frictional forces
Solution Approach 1:
The clutch mechanism is segmented into two independent opening devices: a first opening device that uses operating torque to generate opening force, and a second opening device that provides alternative opening capability. This segmentation allows the system to shift under load by utilizing the available torque while maintaining structural manageability through modular design.
Solution Approach 2:
The patent introduces a spatially separated opening mechanism that acts in a different dimension from the traditional torque transmission path. The opening devices are positioned and configured to generate opening forces independently from the main torque flow, allowing clutch engagement/disengagement without directly opposing the torque transmission, thereby reducing frictional resistance during shifting.
2Reliability
If hub shifting systems are used, then components are protected from external influences, but weight distribution becomes unfavorable due to high weight on rear wheel
Solution Approach 1:
The clutch device is extracted from the traditional hub location and integrated into the bottom bracket area, separating the gear shifting function from the rear wheel hub. This extraction maintains component protection through the enclosed bottom bracket housing while eliminating the unfavorable weight distribution caused by concentrating mass in the rear wheel hub.
3Ease of operation
If derailleur shifting systems are used, then shifting under load is possible, but components are exposed to environmental influences causing increased wear
Solution Approach 1:
The patent merges the advantages of both derailleur and hub systems by combining the shifting-under-load capability with protected components. The clutch mechanism is housed within the enclosed bottom bracket area, protecting components from environmental influences, while the opening devices enable shifting under load through torque utilization, effectively merging the protective enclosure of hub systems with the load-shifting capability of derailleur systems.
4Ease of operation
If spatially separated opening mechanism is used, then shifting under load is enabled, but device complexity increases
Solution Approach 1:
The first opening device utilizes the operating torque itself to generate the opening force, making the system self-serving. The operating torque that would otherwise be lost during shifting is converted into the force needed to open the clutch, eliminating the need for separate power sources or complex actuation systems and reducing overall device complexity despite the spatially separated design.
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 shifting capability under load, reduces maintenance needs, and improves ride comfort by allowing gear shifts without interrupting pedaling, facilitating a more compact and efficient gear-shifting system.
Implementation Method 1
a first opening device (6, 19), arranged spatially separated from the torque transmission region of the clutch device (1), to generate, from an operating torque with which the first clutch half (2) is supplied, a first opening force by means of which the clutch device (1) is transitionable from a closed state to an opened state
Data Source
AI summary
The invention relates to a clutch device for selective transmission of a torque from a first shaft or hub to a second shaft or hub, in particular for a gear-shifting system for a bicycle. The clutch device has first and second clutch halves, an opening device adapted to generate, from an operating torque with which the first clutch half is supplied, in particular by means of the operation of the bicycle with the gear-shifting system, an opening force by means of which the clutch device is opened, as well as an actuating device for controlling the opening device.According to the invention, the opening device is arranged spatially separated from the torque transmission region of the clutch device, i.e., from that spatial region at which, when the clutch device is closed, a torque transmission from the first to the second clutch half may take place.Utilizing the operating torque to generate the opening force for the clutch device facilitates opening the clutch device and thus shifting under load.