Multi-component gear noise reduction via material differentiation
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Solution Overview
Problem
Existing gear systems in actuators face a trade-off between reducing noise and ensuring robustness, as harder materials that resist wear and breaking also generate more noise, and current solutions like using glass-fiber reinforced plastics or high-performance materials are either costly or not suitable for mass-manufacture.
Innovation Solution
A multi-component gear design where the first gear portion, made from a hard material, is combined with a second gear portion made from a softer material with lower dynamic hardness, using an overmolding process to create a non-circular interface for enhanced locking and reinforcement, thereby reducing noise without compromising strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a harder material is used for the gear to resist wear and breaking, then the robustness and wear-resistance of the gear train is improved, but the noise generated during operation increases
Solution Approach 1:
The gear is divided into two distinct portions with different material properties: a first gear portion made from a hard material (such as glass-fibre reinforced plastic) to provide wear-resistance and structural strength, and a second gear portion made from a softer material (with lower dynamic hardness) to reduce noise during gear engagement. This local differentiation allows each portion to optimize its function - the hard portion handles wear and load while the soft portion dampens impact noise.
Solution Approach 2:
The invention employs a composite structure combining two different materials in a single gear component. The first material provides mechanical strength and wear resistance, while the second material provides noise reduction. This composite approach allows the gear to simultaneously achieve robustness and low-noise operation, resolving the contradiction between these two requirements.
2Object-generated harmful factors
If a high-performance material is used to achieve both low-noise and low-wear properties, then the noise and wear are reduced, but the manufacturing cost increases significantly
Solution Approach 1:
Instead of using expensive high-performance material throughout the entire gear, the invention applies the softer, noise-reducing material only to the second gear portion where it is most needed for noise reduction. The first gear portion uses a more cost-effective hard material. This localized approach achieves the desired noise reduction while minimizing material costs.
Solution Approach 2:
The gear is segmented into two portions that can be manufactured separately and then combined. This segmentation allows each portion to be optimized for its specific function and manufactured using appropriate processes, avoiding the need to manufacture the entire gear from expensive high-performance material.
3Stability of the object's composition
If a non-circular interface is used between gear portions to prevent dephasing, then the rotational stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The interface between the first and second gear portions is designed with a non-circular, asymmetric shape. This asymmetric interface prevents dephasing during rotation by ensuring that the portions lock together in a specific orientation. The asymmetric geometry provides inherent rotational stability without requiring additional complex locking mechanisms.
Data Source
AI summary
A multi-component gear for an actuator is provided. The gear includes a first gear portion having an engagement head and a gear stem axially extending from the engagement head, and a second gear portion having a gear body which includes a plurality of gear teeth at a circumference thereof, the gear body being received around the engagement head of the first gear portion. The first gear portion is formed from a first material and the second gear portion is formed from a second material which has a lower dynamic hardness than the first material.