Modular Bicycle Hub Shaft Kit for Switchable Coaster Braking
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Solution Overview
Problem
Conventional bicycle hub kits with coaster brakes are prone to breakage and lack precise control over brake strength, and switching between hub kits with and without coaster brakes is time-consuming, laborious, and costly due to the need to reconnection spokes.
Innovation Solution
A bicycle hub kit with a replaceable shaft kit that allows transformation between hub kits with and without coaster brakes, featuring a hub body, driver, sprocket, clutch sleeve, and a shaft kit that includes a sleeve positioning kit or a braking positioning kit to enable or disable the coaster brake function without reconnection of spokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hub kit with coaster brake is used, then braking convenience is improved, but reliability deteriorates due to frequent breakage
Solution Approach 1:
The hub kit is divided into functionally independent modules: a permanent hub body and a replaceable shaft kit. The shaft kit contains the coaster brake mechanism as a separate, self-contained unit that can be independently replaced when worn or broken, isolating the unreliable braking components from the permanent hub structure.
Solution Approach 2:
The system allows changing the operational state of the coaster brake by swapping the shaft kit. When the shaft kit is installed, coaster brake function is activated; when removed, the hub operates without coaster brake. This enables users to adjust the braking configuration based on reliability needs.
2Adaptability or versatility
If a hub kit with coaster brake is used, then braking function is added, but manufacturing precision deteriorates due to imprecise brake strength control
Solution Approach 1:
The brake mechanism is segmented into a separate shaft kit that can be replaced with different versions (e.g., varying spring tensions, brake pad materials, or friction surfaces). This allows precise brake strength control through component selection rather than complex adjustment mechanisms.
3Reliability
If the hub kit is replaced to remove coaster brake, then reliability is improved, but loss of time increases due to spoke reconnection
Solution Approach 1:
The hub kit is segmented into a permanent hub body and a replaceable shaft kit. The shaft kit contains all moving parts including the coaster brake mechanism. When replacement is needed, only the shaft kit is removed and replaced, while the hub body with attached spokes remains in place, eliminating the time-consuming spoke reconnection process.
Solution Approach 2:
The shaft kit is extracted as a separate, self-contained unit from the hub body. This extraction allows the shaft kit to be independently replaced without affecting the permanent hub structure or requiring spoke reconnection, significantly reducing replacement time.
4Adaptability or versatility
If the hub kit is replaced to remove coaster brake, then brake function is removed, but device complexity increases due to multiple hub kit types
Solution Approach 1:
Multiple functional configurations (with coaster brake, without coaster brake) are merged into a single permanent hub body design. The functional differences are achieved through optional shaft kit attachments rather than requiring multiple complete hub kit designs, reducing overall system complexity.
Solution Approach 2:
The permanent hub body is designed with universal mounting features that accept different shaft kit variants. This allows a single hub body design to support multiple functional configurations (coaster brake enabled or disabled) through simple shaft kit selection and attachment, eliminating the need for multiple specialized hub kit designs.
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 easy transformation between coaster brake and non-coaster brake configurations without reconnection of spokes, reducing maintenance time and cost while maintaining the convenience of coaster brake operation.
Implementation Method 1
a braking spring extending into the first segment of the clutch sleeve
Implementation Method 2
a positioning block connected to the shaft body via a threaded engagement
Implementation Method 3
the at least one brake pad is disposed between an internal peripheral surface of the hub body and outer peripheries of the clutch sleeve and the end base
Data Source
AI summary
A bicycle hub kit has a hub body, a driver disposed to a first end of the hub body, a sprocket connected to the driver, a clutch sleeve disposed inside the hub body and connected to the driver, and a shaft kit. The shaft kit includes a shaft body, an end base fixed to the shaft body, a ball retainer sleeved on the end base and supporting between the hub body and the end base, and a positioning kit disposed between the end base and the clutch sleeve. The positioning kit can be selected from a sleeve positioning kit and a braking positioning kit. The shaft kit can be detached from the hub body for replacing the positioning kit to transform the bicycle hub kit between with and without a coaster brake.