Bicycle Pedal Shaft Fixing Nut with Integral Flange
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Solution Overview
Problem
The existing fixing structure of bicycle pedals is cumbersome during assembly due to the difficulty in placing a washer between the fixing nut and the ball bearing, leading to potential unevenness and instability between the shaft and pedal body.
Innovation Solution
The improved bicycle pedal design incorporates a ball bearing with an inner and outer sleeve, where the shaft is fixed using a fixing nut with an integrally formed flange that presses the inner sleeve, eliminating the need for a washer and enhancing stability by ensuring even contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a washer is used between the fixing nut and the ball bearing, then the contact surface is provided, but the assembly becomes complex and difficult to assemble
Solution Approach 1:
The fixing nut is integrated with the pressing plate into a single unified component. The pressing plate is formed as an integral part of the fixing nut, eliminating the need for a separate washer component while maintaining the contact surface function and simplifying the assembly process.
2Reliability
If a separate washer is used, then the contact surface is provided, but the washer may be uneven affecting stability
Solution Approach 1:
The pressing plate is integrated into the fixing nut as a unified structure, ensuring that the contact surface is precisely formed during the manufacturing of the fixing nut itself. This integration eliminates the risk of unevenness that occurs with separate washers, as the pressing plate's contact surface is manufactured as a single precision component.
3Reliability
If a washer is used, then the contact surface is provided, but the assembly process becomes time-consuming
Solution Approach 1:
The fixing nut and pressing plate are combined into a single integrated component, reducing the number of parts to be assembled. This integration eliminates the step of separately installing the washer, thereby speeding up the assembly process and improving productivity while maintaining the necessary contact surface for stable assembly.
Data Source
AI summary
A pedal includes a pedal body and a shaft. The pedal body has a shaft hole and a ball bearing disposed in the shaft hole. The ball bearing has an inner sleeve and an outer sleeve. The shaft has a locking end with a large diameter and a pivoting end with a small diameter. The pivoting end has a thread section screwed by a fixing nut which presses the inner sleeve of the ball bearing. The outer sleeve is fixed by a cap mounted in an opening of the shaft hole. The shaft is received in the shaft hole and fixed by the fixing nut. The shaft axially passes through the ball bearing. An end of the fixing nut is integrally formed with a flange to press the inner sleeve.