Threaded Push-On-Post Fastener for Low-Machining Assembly
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Solution Overview
Problem
The existing methods for applying threads to multiple pins projecting from a surface of a larger component are time-consuming and costly, particularly in high-stress applications like engine and suspension components, where machining small parts with internal or external threads is inefficient.
Innovation Solution
A push-on-post fastener system comprising a base section, a sleeve section with a central passage and a pin section, where the pin section projects outwardly with an outer annular surface having threads, and the inner surface of the sleeve section includes striations for engagement with the post, allowing for easy assembly and secure fastening without direct machining of threads on the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threads are machined on multiple pins projecting from a component surface, then threaded interfaces are achieved for secure fastening, but manufacturing time and cost increase significantly
Solution Approach 1:
The fastening system is divided into separate functional elements: a base section that attaches to the component, a sleeve section that provides the threaded interface, and a pin section that protrudes for fastener engagement. This segmentation allows the threaded interface to be provided on a separate sleeve rather than machining threads directly on multiple pins, significantly reducing manufacturing time and cost while maintaining secure fastening capability
Solution Approach 2:
The sleeve section acts as an intermediary element between the base section and the pin section. It provides the threaded interface without requiring direct threading of the pin, serving as a mediator that enables secure fastening while avoiding the time-consuming machining process. The sleeve can be formed with threads more efficiently than machining small pins
2Reliability
If threads are machined on multiple pins projecting from a component surface, then threaded interfaces are achieved for secure fastening, but manufacturing cost increases
Solution Approach 1:
By segmenting the fastening system into a base section, sleeve section, and pin section, the threaded interface is provided on the sleeve rather than on each individual pin. This allows for more cost-effective thread formation through processes like rolling or forming on the sleeve, rather than time-consuming machining on multiple small pins, thereby reducing manufacturing cost while maintaining secure fastening
Solution Approach 2:
The sleeve section can be produced as a separate, potentially disposable or replaceable component that provides the threaded interface. Rather than investing in expensive machining operations for each pin, the sleeve can be manufactured more economically using forming or rolling processes, reducing overall manufacturing cost while achieving the same secure fastening function
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
This system provides a cost-effective and efficient method for creating a threaded interface, reducing manufacturing time and costs by allowing the push-on-post fastener to be easily secured to vehicle components, enabling secure joining of components with minimal machining requirements.
Implementation Method 1
The inner surface of the central passage includes a plurality of striations that engage the outer annular surface of the pin
Data Source
AI summary
A push-on-post fastener includes a base section and a sleeve section connected with the base section. The sleeve section includes a central passage having an inner surface. A pin section projects outwardly from the sleeve section. The pin includes an outer annular surface section having a first diameter. The inner surface of the central passage includes a plurality of striations.