Main Bearing Layout in Gear Devices for Load Line Control
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Solution Overview
Problem
The existing gear devices face challenges in achieving a long life due to the influence of load action lines on their components, particularly in industrial robots and machine tools, where the load action line and component relationship significantly impacts the gear's durability and performance.
Innovation Solution
The proposed gear device incorporates a specific configuration with an outer cylinder, internal member, first and second main bearings, where the distance between the intersections of load action lines with the rotation axis is set within a defined range, and the load action lines pass through the outer cylinder and annular flange portion in a consecutive manner, ensuring robustness and high performance as a thrust bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load action line passes through the rotation axis at a large distance between intersections, then the bearing performance and load distribution are improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the distance IID between load action line intersections with the rotation axis to fall within a specific range (0.95-1.05 times BBD+BRD×2). This parameter optimization improves bearing performance and load distribution while maintaining manageable structural complexity through mathematical relationship definition.
2Strength
If the load action lines pass through the case and flange portion consecutively, then the thrust bearing capability is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific geometric parameters including the consecutive passage of load action lines through the case and flange portion, and the distance relationship between bearing intersections. These parameter specifications enhance thrust bearing capability while providing clear manufacturing targets to manage precision requirements.
3Duration of action of moving object
If the distance between bearing intersections is optimized within a specific range, then the gear device life is extended, but the design complexity increases
Solution Approach 1:
The patent extends gear device life by optimizing the distance IID between load action line intersections to fall within a specific range expressed by inequality (Expression 1). This parameter optimization balances durability improvement with design complexity by establishing clear mathematical boundaries for the distance parameter.
Data Source
AI summary
A gear device includes an outer cylinder; an internal member at least partially housed in the outer cylinder and configured to rotate relative to the outer cylinder about a predetermined rotation axis; a first main bearing fitted into an annular space formed between the outer cylinder and the internal member; and a second main bearing fitted into the annular space and configured to define the rotation axis in cooperation with the first main bearing. A distance between a first intersection where a load action line of the first main bearing intersects with the rotation axis and a second intersection where a load action line of the second main bearing intersects with the rotation axis is set to fall within a range expressed by a predetermined inequality expression.