Multi-Material Lead Screw Nut Threads for Friction and Static Control
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Solution Overview
Problem
Lead screw nuts face issues with friction, wear, and static electricity due to the limitations of using a single material, which affects efficiency and safety, and existing methods struggle to balance low friction, low wear, high strength, ease of manufacture, and cost effectively.
Innovation Solution
The use of lead screw nuts with thread regions formed from multiple materials with different properties, such as combining low-friction materials like PTFE with high-strength materials like POM, and embedding microchips for monitoring and maintenance alerts, to optimize performance and reduce undesired side effects like static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If lead screw nuts are made from softer materials to reduce friction and allow the nut to wear before the lead screw, then friction and wear are reduced, but the nut wears out too quickly requiring frequent replacement
Solution Approach 1:
The patent applies local quality by creating thread portions with different material properties at different locations within the nut. Specifically, some thread portions are made from softer low-friction materials while other thread portions are made from harder, more wear-resistant materials. This allows the nut to have both low friction and extended life by distributing different material properties to different functional areas of the threads.
Solution Approach 2:
The patent uses composite materials by combining multiple materials within the same nut structure. The nut contains thread portions formed from different materials, creating a composite structure that integrates the benefits of both softer low-friction materials and harder wear-resistant materials into a single component, thereby reducing friction while extending nut life.
2Loss of energy
If low-friction plastic materials are used to reduce friction and simplify manufacture, then friction and manufacturing complexity are reduced, but strength decreases and static electricity generation increases
Solution Approach 1:
The patent applies local quality by assigning different materials to different thread portions based on their functional requirements. Low-friction plastic materials are used in thread portions where friction reduction is critical, while stronger materials are used in thread portions where structural strength is more important. This localized material assignment allows the nut to achieve low friction without sacrificing overall strength.
Solution Approach 2:
The patent uses composite materials to combine low-friction plastics with stronger materials within the same nut. This composite structure allows the nut to benefit from the low friction and ease of manufacture of plastics while compensating for their lower strength through the inclusion of stronger materials in critical load-bearing thread portions.
3Loss of energy
If low-friction plastic materials are used to reduce friction, then friction is reduced, but static electricity generation increases creating safety hazards
Solution Approach 1:
The patent applies local quality by using low-friction plastic materials only in specific thread portions where friction reduction is most beneficial, rather than throughout the entire nut. This localized use reduces the overall static electricity generation while maintaining the friction-reduction benefits in critical areas.
Solution Approach 2:
The patent uses composite materials to combine low-friction plastics with materials that have better electrical conductivity or lower static generation properties. This composite approach allows the nut to achieve low friction while the other materials in the composite structure help dissipate or reduce static electricity accumulation.
Data Source
AI summary
Lead screw nuts having a body having a threaded opening having a thread region formed from a plurality of different materials having different properties, e.g., a thread region formed from a first material, such as a relatively low friction material, and a second material, such as a relatively high strength material (having thread portions formed from the first material and thread portions formed from the second material).