Bolt Thread Structure for Deposit Removal and Seating Feedback
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Solution Overview
Problem
Existing bolt and nut fastening structures fail to effectively remove deposits from the inner surface of female screws, making it difficult for workers to sense the seating and requiring excessive torque, especially when a coating film is present.
Innovation Solution
A bolt design featuring a combination of threads with varying diameters and widths on the tip end side, including a notch and a friction coefficient stabilizer, which allows for efficient engagement with the female screw to shave off deposits and facilitate seating sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thread is provided on the tapered tip end side to peel off coating film, then the coating film removal function is improved, but the contact between the thread and coating film is insufficient, resulting in poor coating film peeling performance
Solution Approach 1:
The invention changes the geometric parameters of the thread by providing multiple threads with different diameters and widths. Specifically, at least one thread has a larger diameter or wider width than the first thread, creating varying contact pressures and engagement areas that effectively peel off coating films while maintaining sufficient contact during tightening.
2Ease of manufacture
If a head-side portion is formed thick to shave off counterpart member as in tapping screw, then the coating film peeling performance is improved, but the structure becomes more complex and the seating sensation is lost
Solution Approach 1:
The invention applies local quality by providing threads with different diameters and widths at specific locations on the shaft. The tip end side features threads with larger diameters or wider widths for effective coating removal, while the head side maintains the first thread for proper engagement and seating sensation, creating localized functional zones without overall structural complexity.
3Manufacturing precision
If a thread with larger diameter or wider width is provided on the tip end side, then the contact with coating film is improved for better peeling, but the torque required for tightening increases
Solution Approach 1:
The invention uses partial action by providing at least one thread with larger diameter or wider width only at the tip end side, rather than along the entire shaft. This localized approach provides sufficient coating film contact and peeling action only where needed, while minimizing the overall torque increase during tightening operations.
4Manufacturing precision
If multiple threads with different diameters and widths are provided on the tip end side, then the coating film peeling performance is significantly improved, but the manufacturing complexity increases
Solution Approach 1:
The invention applies segmentation by dividing the shaft into multiple threaded sections with different characteristics. The first thread on the head side and the additional threads with larger diameters or wider widths on the tip end side are segmented along the shaft length, allowing each section to perform its specific function while maintaining a relatively simple overall manufacturing process.
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 bolt design enables easy removal of deposits on the female screw, reduces the required torque for seating, and allows workers to easily sense the completion of fastening, while minimizing load and preventing loosening or falling-off.
Implementation Method 1
a thread having a friction coefficient stabilizer applied thereto is provided on the tip end side of the shaft
Data Source
AI summary
To threadedly engage a bolt and a female screw with each other, thereby making it possible to shave off a deposit on the inner surface of the female screw and to make it easy for a worker to sense the seating, there is provided a bolt including a shaft 2 and a head, wherein a first thread 11 is provided on a head side of the shaft, and at least one of a thread provided larger in diameter than the first thread and a thread provided wider than the first thread is provided on a tip end side of the shaft.