Spoke Nipple Self-Locking via Composite Insert
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spoked wheel nipples face challenges with aligning metal and deformable materials, complex and costly manufacturing, potential weakening due to large self-locking mechanism diameter, and limited mechanical strength, which affects the reliability and robustness of spoke retention.
Innovation Solution
A spoked wheel nipple design featuring a self-locking mechanism with soft material inserts, such as deformable thermoplastics, housed in a recess within the head to prevent slackening, combined with polygonal or notched keys for secure engagement, allowing for simplified manufacturing and enhanced mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-locking means are made of deformable plastics material, then self-locking action is achieved, but mechanical strength is insufficient
Solution Approach 1:
The self-locking means comprises a composite structure with a deformable body made of plastics material and at least one insert made of metal material embedded within it. The metal insert provides the necessary mechanical strength while the deformable plastics body maintains the self-locking action through deformation. This composite approach resolves the contradiction by combining materials with complementary properties.
2Reliability
If self-locking means have large diameter, then self-locking effect is maintained, but nipple is weakened
Solution Approach 1:
The self-locking means is designed with a localized insert structure where the metal insert is positioned specifically within the deformable body to provide strength only where needed for spoke retention. This localized reinforcement allows the nipple to maintain self-locking effect without requiring a large overall diameter, thereby preserving the structural integrity and strength of the nipple.
3Ease of manufacture
If manufacturing process is simplified, then production cost is reduced, but alignment precision deteriorates
Solution Approach 1:
The insert is pre-positioned within the deformable body during the molding process, so that when the self-locking means is assembled into the nipple, the alignment of holes is already established. This preliminary positioning action eliminates the need for complex post-assembly alignment operations, thereby simplifying the manufacturing process while maintaining precise hole alignment.
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 design provides effective and repeatable self-locking, improved robustness, and ease of manufacturing, ensuring secure spoke retention without weakening the nipple, while maintaining cost-effectiveness and reliability.
Implementation Method 1
at least one insert 10 made of a material which is relatively soft in comparison with the metal material of the nipple, for example a deformable thermoplastics resin
Implementation Method 2
which can act as a brake for a thread
Data Source
AI summary
A nipple for spokes of spoked wheels includes a head and a shank, both of which are traversed by one axial through hole which is at least partly threaded, with at least one recess which intersects the threaded surface of the hole and a deformable insert inserted in each recess. The recess and insert are shaped and positioned relative to the hole so that the insert is held in the corresponding recess in a position which partly projects over at least one length in the hole to interfere with the thread of the spoke.