Composite Lightweight Gear With Variable Lattice Noise Damping
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Solution Overview
Problem
Gears composed of solid metal or metal alloys are heavy and generate undesirable noise during operation.
Innovation Solution
A lightweight gear design featuring a hub composed of a metal or metal alloy, an inner core made of a polymer-based material, and a lattice structure with varying density zones, coupled with an outer liner, which reduces weight and noise through a combination of materials and structural design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid metal or metal alloy gear is used, then wear resistance is improved, but weight increases
Solution Approach 1:
The gear combines a polymer-based inner core with a metal outer liner to create a composite structure. The polymer core provides lightweight properties while the metal liner delivers wear resistance at the contact surfaces, resolving the contradiction between weight and wear resistance through material composition.
Solution Approach 2:
The metal outer liner is applied specifically at the tooth contact surfaces where wear resistance is needed, while the non-critical bulk structure uses lightweight polymer material. This localized application of metal material provides wear resistance only where required, reducing overall weight while maintaining functional performance.
2Strength
If a solid metal or metal alloy gear is used, then structural strength is improved, but operational noise increases
Solution Approach 1:
The composite structure of polymer core and metal liner creates inherent damping characteristics. The polymer material absorbs vibrations and reduces noise generation during gear operation, while the metal liner maintains structural strength, thereby reducing operational noise without sacrificing strength.
Solution Approach 2:
The varying density zones in the lattice structure modify the gear's vibrational characteristics and natural frequencies, reducing resonance and noise generation during operation while maintaining structural integrity through optimized material distribution.
3Ease of manufacture
If a uniform density lattice structure is used, then manufacturing simplicity is improved, but mechanical performance under varying stress is worsened
Solution Approach 1:
The lattice structure features varying density zones with different cell configurations optimized for specific regions. High-stress areas have denser lattice structures for strength, while low-stress areas have sparser structures for weight reduction. This localized optimization maintains manufacturing feasibility while significantly improving mechanical performance under varying stress conditions.
Data Source
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AI summary
A lightweight gear includes a hub, and a tooth ring defining a plurality of gear teeth. The tooth ring includes an inner core composed of a polymer-based material that is coupled to the lattice structure. The lightweight gear includes a lattice structure interconnecting the hub and the tooth ring. The lattice structure has a density that varies radially based on an operating condition of the lightweight gear and the lattice structure is composed of a metal or a metal alloy.