Robot Second-Arm Frame Structure for Lower Inertia and Twist Rigidity
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Solution Overview
Problem
Existing robots face challenges in reducing the inertia force and power consumption while ensuring sufficient rigidity, particularly in the twist directions, due to insufficient weight reduction and strength of the second arm.
Innovation Solution
A robot design featuring a frame-shaped second arm with a base comprising a first and second placement portion, supported by first and second beams, and reinforced with third and fourth beams, which enhances structural integrity and reduces weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the second arm uses a traditional solid structure, then strength and rigidity are sufficient, but weight is excessive leading to high inertia force and power consumption
Solution Approach 1:
The second arm base is divided into a frame-shaped structure consisting of multiple beams (first beam 33, second beam 34, third beam 35, fourth beam 36) connected together. This segmentation creates a lightweight lattice structure that maintains structural integrity while significantly reducing weight compared to a solid block design.
Solution Approach 2:
The frame structure combines multiple beam elements with different orientations and functions. The first and second beams provide primary support, while the third and fourth beams add reinforcement in specific directions, creating a composite structural system that optimizes the strength-to-weight ratio.
2Productivity
If the second arm base is made lightweight, then inertia force and power consumption are reduced, but strength and rigidity in twist directions become insufficient
Solution Approach 1:
Different beams are strategically positioned to provide localized reinforcement where needed. The third beam 35 and fourth beam 36 are specifically arranged to enhance rigidity in twist directions, while other areas maintain lightweight construction. This local reinforcement approach ensures sufficient strength without compromising overall weight reduction.
Solution Approach 2:
The frame structure extends in multiple spatial dimensions with beams arranged in different orientations (first beam 33, second beam 34, third beam 35, fourth beam 36). This multi-dimensional arrangement creates structural rigidity in twist directions that would be difficult to achieve with simple one-dimensional reinforcement, while maintaining lightweight construction.
Data Source
AI summary
A robot includes a base, a first arm coupled rotatably around a first rotation axis relative to the base, a second arm having a base and rotating around a second rotation axis parallel to the first rotation axis relative to the first arm, a shaft placed at an opposite side to the first arm of the second arm, a drive unit rotationally driving the second arm around the second rotation axis, and a supporting portion supporting the shaft to rotate around a third rotation axis parallel to the second rotation axis and move the shaft along an axial direction of the third rotation axis, wherein the base has a first placement portion in which the drive unit is placed, a second placement portion in which the supporting portion is placed, a first beam and a second beam placed over between the first placement portion and the second placement portion.