Symmetric Linear Motion Linkage for High-Strength Long Stroke
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Solution Overview
Problem
Existing linear motion mechanisms, such as those described in Patent Document 1, suffer from structural weaknesses in the bearing portion, making them unsuitable for applications involving impact loads or heavy lifting, such as robot legs or cranes.
Innovation Solution
A linear motion mechanism is designed with an intermediate link that converts rotational force into linear motion, featuring first and second links that move symmetrically in conjunction with each other, enhancing strength and rigidity while allowing for compactness and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional extension/contraction shaft actuation mechanism is used, then the structure can be compact and lightweight, but the bearing portion has low structural strength and cannot withstand impact loads or heavy lifting
Solution Approach 1:
The mechanism is divided into multiple links (first link, intermediate link, second link) that move symmetrically in conjunction with each other. This segmentation allows each component to be optimized for strength while maintaining overall compactness, resolving the contradiction between bearing portion strength and structural complexity.
2Length of moving object
If the linear motion mechanism is designed for long stroke, then the range of motion is increased, but the structure becomes less compact and may compromise strength
Solution Approach 1:
The first link, intermediate link, and second link are arranged in a nested configuration where they can extend and contract relative to each other. This nesting allows the mechanism to achieve a long stroke when extended while maintaining a compact volume when contracted, resolving the contradiction between stroke length and mechanism volume.
3Weight of moving object
If the mechanism is designed to be lightweight, then the mass is reduced for better mobility, but the strength and rigidity may be compromised
Solution Approach 1:
The mechanism employs symmetric conjunction of links with optimized local structures at critical bearing portions. This allows the overall mechanism to remain lightweight while specific areas are reinforced to provide necessary strength and rigidity, resolving the contradiction between weight and structural strength.
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
The mechanism provides increased strength and rigidity, enabling applications in environments with impact loads and heavy lifting, while maintaining a compact and lightweight structure.
Implementation Method 1
intermediate link including a conversion mechanism that converts a rotational force from a motor into a driving force in a linear direction
Data Source
AI summary
Provided is a linear motion mechanism having a further enhanced strength of a structure.The linear motion mechanism including an intermediate link including a conversion mechanism that converts a rotational force from a motor into a driving force in a linear direction, the intermediate link extending in the linear direction, a first link that linearly moves toward a first side in the linear direction from an end of the intermediate link on the first side on the basis of the driving force in the linear direction, and a second link that linearly moves toward a second side opposite to the first side from an end of the intermediate link on the second side on the basis of the driving force in the linear direction, in which the first link and the second link linearly move symmetrically in the linear direction in conjunction with each other.