Gear Bearing Layout for Load Line Alignment and Longer Life
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Solution Overview
Problem
The life of gear devices is influenced by the relationship between load action lines and their components, and existing designs fail to optimize this relationship for long-life performance.
Innovation Solution
A gear device design where the distance between intersections of load action lines of main bearings is set within a specific range, ensuring appropriate positioning to enhance robustness and performance, with load action lines passing through the outer cylinder and flange portion consecutively, and the intersection positioned in the flange portion to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the load action line intersects the rotation axis at arbitrary positions, then the gear device structure is simple, but the gear device life is reduced due to improper load distribution
Solution Approach 1:
The patent applies parameter changes by optimizing the positional parameters of the load action lines relative to the rotation axis. Specifically, it sets the distance between the first intersection and second intersection (IID) within a specific range (0.1-0.3 times the distance between the two bearings), and positions the intersection of load action lines within the flange portion. These parameter optimizations improve load distribution and gear device life without fundamentally changing the structural complexity.
2Strength
If the load action lines are positioned without specific constraints, then the manufacturing process is simple, but the robustness against external forces is insufficient
Solution Approach 1:
The patent establishes specific parameter ranges for load action line positioning: the distance IID between intersections should be 0.1-0.3 times the bearing distance BBD, and the intersection of load action lines should be located within the flange portion at a distance BID of 0.05-0.2 times BBD from the rotation axis. These parameter specifications enhance robustness while maintaining manufacturing feasibility through clear design guidelines.
Solution Approach 2:
The patent uses the flange portion structure as a reference framework for positioning the load action line intersection. By designing the bearing arrangement to align with the existing flange geometry, the patent leverages the flange's structural properties to enhance robustness without requiring additional complex manufacturing processes.
3Stability of the object's composition
If the intersection of load action lines is positioned outside the flange portion, then the structural design is simpler, but deformation occurs under load
Solution Approach 1:
The patent specifies that the intersection of load action lines should be positioned within the flange portion, at a distance BID of 0.05-0.2 times the bearing distance BBD from the rotation axis. This parameter constraint ensures the intersection falls within the structurally stable flange region, preventing deformation while maintaining reasonable positioning precision requirements.
Data Source
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AI summary
The present application discloses a gear device provided with: 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.