Single-Groove Short-Tail Rivet Stress and Engagement
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Solution Overview
Problem
Existing short-tail pulling rivets face challenges such as high positioning requirements, easily jammed broached grooves, stress concentration, and insufficient tightening force, which hinder their performance and reliability in connecting components of rolling stock.
Innovation Solution
A single-groove short-tail pulling rivet with a broached groove featuring a continuous and smooth curve, a tooth profile combining an arc with a straight line, and a collar design with a waveform pattern, facilitating easier manufacturing and reduced stress concentration, along with a simplified installation method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-groove short tail structure is used, then the claw engagement is improved, but the positioning requirements become more stringent and the grooves are easily blocked
Solution Approach 1:
The patent extracts the grooves from the traditional multi-groove short tail structure and replaces them with a single broached groove. This extraction eliminates the complexity of multiple grooves while maintaining the essential function of claw engagement through the simplified single groove design.
Solution Approach 2:
Instead of using multiple grooves to improve engagement, the patent inverts the approach by using a single groove with a specifically designed smooth curved surface. This inversion simplifies the structure while achieving reliable engagement through the optimized groove geometry that prevents blocking.
2Device complexity
If a single-groove short tail with existing broached groove shape is used, then the structure is simplified, but stress concentration occurs and tooth shape damage may occur
Solution Approach 1:
The patent applies curvature by designing the broached groove with a smooth curved surface instead of sharp edges or straight lines. This curvature eliminates stress concentration points that would otherwise occur at groove corners, thereby preventing tooth shape damage while maintaining structural simplicity.
3Strength
If a locking groove section with complex tooth profile is used, then the tightening force is improved, but the manufacturing and detection difficulty increases
Solution Approach 1:
The patent changes the geometric parameters of the tooth profile to an arc-shaped design. This parameter change simplifies the manufacturing and detection processes while maintaining adequate tightening force through the optimized arc geometry that distributes stress more effectively.
Data Source
AI summary
Provided is a single-groove and short-tail pulling rivet and an erection method thereof, and the pulling rivet comprises a single groove and a short tail having a broached groove with a continuous and smooth cambered surface, and is characterized by easy manufacturing, low cost and convenient erection. The broached groove is an arc surface with three sections of different radiuses, which solves stress concentration and sticking of a single-groove and short-tail rivet during riveting, and allows a claw of a riveting machine to be engaged to the best position automatically. The tooth profile of a locking groove section of the rivet is a curve combining an arc and a straight line, which greatly improves fastening force. In a word, the invention solves insufficient clamping degree of the short tail, seizing during riveting, blocking of the broached groove, failed riveting, shortage and loss of tightness of existing short-tail pulling rivets, and meets the performance and reliability requirements of the fastening systems for rolling stocks.