Compact Servo Gear Layout for Thin-Arm Humanoid Robots
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Solution Overview
Problem
Existing servos occupy too much internal space, making them unsuitable for 'thin arm' type humanoid robots and robots with forearms, limiting their applicability in narrower spaces.
Innovation Solution
A compact servo design featuring a gear set with a W-shaped arrangement of gears, a direct-current motor, and a potentiometer, housed in a lightweight nylon 66 with glass fiber structure, allowing for a narrower profile and reduced volume, with a copper ring and insertable servo plate for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional servo design is used, then motor power and gear reduction ratio are sufficient, but the servo occupies too much internal space
Solution Approach 1:
The patent applies dimensional change by transitioning from a traditional linear gear arrangement to a W-shaped spatial configuration. The gears are arranged in a three-dimensional W pattern, utilizing vertical and diagonal dimensions to compact the gear train. This allows the gear reduction mechanism to fit within a smaller footprint while maintaining the required reduction ratio and motor power output.
2Volume of moving object
If gear arrangement is optimized for compactness, then servo volume is reduced, but gear meshing and power transmission efficiency may be affected
Solution Approach 1:
The patent applies local quality by optimizing the meshing characteristics at each specific gear interface within the W-shaped arrangement. Each gear pair is positioned and dimensioned to ensure proper tooth engagement and load distribution. The local gear geometry and spacing are tailored to maintain reliable power transmission despite the compact overall configuration, ensuring that each local interaction point functions optimally.
Data Source
AI summary
A servo includes: a servo body, an upper cover fixedly connected to the top of the servo body, a lower cover fixedly connected to the bottom of the servo body, and a direct-current motor, a motor gear and a gear set which are arranged between the servo body and the upper cover and in driving connection with one another in sequence. The servo further comprises a first part and a second part protruding from the first part, and the gear set comprises an output gear located at the second part.