Pedal Spindle Structure with Segmented Insert and Sleeve
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Solution Overview
Problem
Conventional bicycle pedals require costly and time-consuming manufacturing processes, including hole opening and threading, and external force expansion with limited heat treatment applicability, which increases production costs and time.
Innovation Solution
A spindle structure with a pedal body featuring a through hole and a spindle body with an insert and threaded portion, along with sleeves and a ring for positioning and protection, allowing easy assembly and cost-effective production, while maintaining structural strength without heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hole opening and threading procedures are applied to the central shaft, then the pedal body can be securely attached to the shaft, but the production cost and time increase
Solution Approach 1:
The invention divides the central shaft into multiple components: a non-threaded main shaft body and a separate threaded insert. This segmentation allows the threaded insert to be pre-formed and then inserted into the shaft, eliminating the need for hole opening and threading operations on the shaft itself, thereby reducing production time while maintaining secure attachment capability
Solution Approach 2:
The threaded insert acts as an intermediary component that provides the threading function without requiring the main shaft to be threaded. This mediator component can be easily inserted and secured, providing the necessary thread engagement for the pedal body attachment while avoiding complex machining operations on the shaft
2Reliability
If external force expansion is applied to the terminal end of the central shaft, then the pedal body can be restricted, but heat treatment is required which limits applicability
Solution Approach 1:
The invention uses a simple expandable ring or sleeve that can be easily deformed and installed without heat treatment. This component is designed to be simple and cost-effective, providing the necessary restriction function through mechanical expansion rather than requiring complex heat treatment processes, thus increasing adaptability to different materials and production capabilities
3Strength
If heat treatment is applied to enhance structural strength, then the central shaft strength increases, but the process becomes more complex and time-consuming
Solution Approach 1:
The invention applies local quality by concentrating the strength enhancement in the threaded insert rather than treating the entire shaft. The insert can be made from a high-strength material or pre-treated locally, providing necessary strength at the critical attachment point without requiring complex heat treatment of the entire shaft assembly
Data Source
AI summary
A spindle structure for a pedal includes a pedal body having a through hole formed from one end thereof to another end thereof, two ends of the through hole respectively defined as a first end opening and a second end opening; and a spindle body assembled on the pedal body, the spindle body having an insert portion and a threaded portion respectively defined at two ends thereof, the insert portion inserted into the through hole of the pedal body, a tip portion of the insert portion defined as a positioning portion, a periphery of the positioning portion gradually widened toward the second end opening, the threaded portion exposed from the first end opening, the positioning portion exposed from the second end opening.