Guide Bolt Structure for Oblique Insertion and Debris Seizure
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Solution Overview
Problem
Existing bolts fail to effectively suppress seizure due to both oblique insertion and biting of foreign substances, with insufficient removal performance for large foreign substances like spatters.
Innovation Solution
A bolt design featuring a tapered surface with recesses and cutout portions, along with a guide portion that corrects the bolt's attitude and removes foreign substances, preventing seizure by idling without forced correction and removing thick films and spatters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide portion is added to correct bolt attitude, then oblique insertion seizure is suppressed, but device complexity increases
Solution Approach 1:
The bolt's distal end is segmented into multiple functional zones: a tapered surface with recesses for initial guidance and foreign substance removal, followed by a threaded portion with cutout shapes for continued attitude correction and debris ejection. This segmentation allows each zone to perform its specific function efficiently without requiring a completely redesigned bolt structure.
Solution Approach 2:
The tapered surface with recesses performs preliminary action by guiding the bolt into proper alignment and removing foreign substances before the threaded portion engages with the internal thread. This preliminary guidance prevents oblique insertion from causing seizure, reducing the need for complex correction mechanisms during fastening.
2Reliability
If cutout shapes are added to remove foreign substances, then seizure due to biting foreign substances is suppressed, but manufacturing complexity increases
Solution Approach 1:
The cutout shapes are strategically positioned at specific locations on the threaded portion where foreign substances are most likely to cause seizure. By localizing these cutouts rather than creating complex patterns across the entire bolt surface, the manufacturing process remains relatively simple while effectively addressing the seizure problem.
Solution Approach 2:
The cutout shapes are provided only at the distal end portion of the threaded portion where they are most needed for removing foreign substances that could cause seizure. This localized approach maintains manufacturing simplicity while providing targeted functionality where required.
3Ease of operation
If the guide portion is made to actively correct attitude, then oblique insertion is corrected, but interference with internal thread occurs
Solution Approach 1:
The guide portion's attitude correction capability is made dynamic rather than fixed. When oblique insertion occurs, the guide portion naturally guides the bolt into proper alignment through its geometric configuration. However, if the tilt angle is too large, the guide portion allows the bolt to idle rather than forcibly correct the attitude, preventing interference with the internal thread.
Solution Approach 2:
The guide portion is designed to prevent harmful forced correction before it can occur. By providing a gradual taper and strategically positioned recesses, the guide portion allows gentle self-correction of minor misalignments while preventing the kind of forced correction that would cause interference with the internal thread.
Data Source
AI summary
The objective is to provide a bolt which can more effectively suppress occurrence of seizure due to both oblique insertion and biting of foreign substances. The bolt includes a tapered surface, a guide portion, and a threaded portion in order from a distal end side and further includes a plurality of recesses provided on the tapered surface and a plurality of cutout portions provided at a distal end portion of the threaded portion.