Wheel Hub Axial Braking Assembly with Rotating Connecting Arms
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Solution Overview
Problem
Conventional wheel hubs with braking devices have a large connecting arm that complicates assembly with the bicycle frame, making it cumbersome and difficult to secure properly.
Innovation Solution
A wheel hub design featuring an axle device with a driving sleeve, braking sleeve, pressing jacket, and a fixing member with an elongated engaging protrusion that securely mounts to the bicycle frame, providing a compact and aesthetically appealing assembly solution, and includes a conical pressing surface to enhance braking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional connecting arm is used to connect the wheel hub to the bicycle frame, then the braking device can be prevented from loosening or unintentional rotation, but the connecting arm has a large volume and is troublesome in assembly with the bicycle frame
Solution Approach 1:
The connecting arm is divided into a first connecting arm and a second connecting arm that are rotatably connected. This segmentation allows each arm to be smaller and easier to assemble individually while maintaining the overall stability function through their combined rotational connection.
Solution Approach 2:
The pressing jacket is mounted around the axle and can selectively extend into the braking sleeve, creating a nested structure. This nesting allows the pressing jacket to provide braking force without requiring additional external space, reducing overall device volume while maintaining braking reliability.
2Reliability
If a conventional connecting arm design is used, then the braking device is secured, but it is troublesome in assembly with the bicycle frame
Solution Approach 1:
The first and second connecting arms are designed to be rotatably connected, allowing dynamic adjustment during assembly and operation. This rotational flexibility makes assembly more convenient while maintaining secure connection through the pinned joint between the two arms.
Solution Approach 2:
The pressing jacket acts as an intermediary element that can selectively extend into the braking sleeve to provide braking force. This intermediary mechanism ensures secure braking connection while allowing for easy assembly and disassembly of the wheel hub from the bicycle frame.
3Power
If the pressing jacket extends into the braking sleeve, then braking efficiency is enhanced through conical pressing surface contact, but the structure becomes more complex
Solution Approach 1:
The pressing jacket features a conical pressing surface that contacts the inner surface of the braking sleeve. This curved conical geometry concentrates the braking force efficiently through surface contact, enhancing braking power while the simple conical shape avoids adding significant structural complexity.
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 convenient and secure assembly of the wheel hub with the bicycle frame while providing effective braking by utilizing a compact design that prevents unintentional rotation and enhances braking performance through the engagement of the conical surfaces and friction between components.
Implementation Method 1
The pressing jacket (26) has a conical pressing surface (264) selectively extending into the braking sleeve (24) to press against the inner surface of the braking sleeve (24)
Data Source
AI summary
A wheel hub has an axle device and a braking device. The axle device has an axle and a hub body. The hub body is mounted rotatably around the axle. The braking device is connected to the axle device and has a driving sleeve, a braking sleeve, a pressing jacket, and a fixing member. The fixing member is mounted in the hub body, is mounted around an end of the axle, and has a first end and an elongated engaging protrusion. The elongated engaging protrusion is formed on and protrudes from the first end of the fixing member.