Bicycle Hub Retainer Structure for Spacer-Free Bearing Positioning
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Solution Overview
Problem
Existing bicycle hubs lack efficient mechanisms for axially positioning bearings without spacers, leading to complexity and potential susceptibility to axial forces, which affects the hub's reliability and ease of assembly.
Innovation Solution
The hub design incorporates an inner and outer retainer system with threaded engagements to axially position bearings relative to the hub axle and rotating body, allowing for adjustable and secure positioning without spacers, and includes a second bearing for enhanced support and freewheel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are used to axially position bearings in a hub, then the axial position of bearings can be set, but the device complexity increases and the bearing becomes susceptible to axial forces
Solution Approach 1:
The invention removes the spacer component from the hub assembly and instead integrates the axial positioning function directly into the bearing unit through the retainer structure. The retainer is formed as an integral part of the bearing unit, eliminating the need for separate spacers and reducing overall device complexity while maintaining precise axial positioning capability
Solution Approach 2:
The retainer and bearing unit are merged into a single integrated component. The retainer is formed as an integral part of the bearing unit, combining the functions of bearing support, axial positioning, and structural integrity into one unified element, thereby simplifying the hub construction
2Manufacturing precision
If spacers are used to position bearings, then axial positioning is achieved, but reliability decreases due to susceptibility to axial forces
Solution Approach 1:
The vulnerable spacer component is removed from the system. By eliminating the spacer and integrating positioning functionality into the retainer-bearing unit, the design removes the weak link that was susceptible to axial forces, thereby improving reliability
Solution Approach 2:
The retainer structure is designed with inherent load-bearing capacity to withstand axial forces before they can affect the bearing. The retainer acts as a protective element that absorbs and distributes axial loads, preventing them from being transmitted directly to the bearing
3Device complexity
If a simple bearing support structure is used, then device complexity is reduced, but ease of assembly deteriorates
Solution Approach 1:
The bearing unit is pre-assembled with the retainer integrated as a single unit before installation into the hub. This preliminary integration ensures proper axial positioning and alignment are built-in, eliminating the need for complex assembly procedures and making the overall assembly process simpler and more reliable
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
This design simplifies the construction and assembly of the hub, reduces axial forces on bearings, and ensures reliable rotation and freewheeling functionality, enhancing the overall performance and durability of the bicycle hub.
Implementation Method 1
The first roller elements are disposed between the first inner race and the first outer race
Implementation Method 2
The inner retainer has an internal thread that is threadedly engaged with an external thread of the hub axle
Data Source
AI summary
A hub is provided for a human-powered vehicle, and includes a hub axle, a rotating body, a bearing, an inner retainer and an outer retainer. The rotating body is rotatably mounted on the hub axle. The bearing rotatably coupling the rotating body to the hub axle. The bearing includes an inner race, an outer race and a plurality of roller elements. The inner race has an axially facing portion abutting an inner abutment of the hub axle. The outer race has an axially facing portion abutting an outer abutment of the rotating body. The roller elements are disposed between the inner race and the outer race. The inner retainer is coupled to the hub axle and abuts an axially facing portion of the inner race. The outer retainer is coupled to the rotating body and abuts an axially facing portion of the outer race.