Speed Reducer Guide Plate Load Distribution
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Solution Overview
Problem
Existing speed reducers face issues with stress concentration and strength requirements due to external loads, particularly in resin material cases, where the guide plate is susceptible to excessive loads and requires enhanced durability and load distribution.
Innovation Solution
A speed reducer design featuring a guide plate with parallel guide recesses and protrusions, allowing sliding in orthogonal radial directions, and a housing with steps to distribute external loads, reducing stress concentration and enhancing the guide plate's strength by dispersing reaction forces through multiple guide protrusions and recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the guide plate is made with simpler structure to reduce manufacturing cost, then ease of manufacture is improved, but the guide plate becomes susceptible to excessive loads and stress concentration
Solution Approach 1:
The guide plate is divided into multiple guide protrusions (first, second, third guide protrusions) that distribute the external load across multiple contact points with the guide plate. This segmentation allows the plate to maintain simpler overall structure while individually managing load paths to prevent stress concentration at any single point.
Solution Approach 2:
The guide plate features locally optimized regions with specific guide protrusions positioned at strategic locations to handle different directional components of the external load. The local geometry of the guide plate includes reinforced regions where guide protrusions contact the plate, providing targeted strength where needed without requiring the entire plate to be heavily constructed.
2Strength
If the guide plate is designed with multiple guide protrusions to distribute external loads, then strength and load distribution are improved, but device complexity increases
Solution Approach 1:
Multiple guide protrusions (first, second, third guide protrusions) are merged into a single integrated guide plate component rather than being separate parts. This combining approach distributes external loads across multiple contact points while maintaining a unified plate structure, avoiding the complexity of multiple separate components and assemblies.
Solution Approach 2:
The guide plate serves multiple functions simultaneously: it guides the externally toothed gear wheel, distributes external loads across multiple guide protrusions, and provides structural support. This multi-functionality is achieved within a single component design, reducing the need for additional separate elements and minimizing overall device complexity.
3Weight of moving object
If resin material is used for the case to minimize mass and cost, then weight and manufacturing cost are reduced, but the case becomes more susceptible to damage from concentrated external loads
Solution Approach 1:
The external load is segmented into multiple contact points through the first, second, and third guide protrusions. This segmentation distributes the force across multiple regions of the resin case, preventing stress concentration at any single point and allowing the lightweight resin material to withstand external loads effectively.
Solution Approach 2:
The resin case incorporates local structural features at the contact regions of the guide protrusions to enhance strength where loads are applied. These local reinforcements are positioned precisely where the guide protrusions contact the case, providing targeted load-bearing capability without requiring the entire case to be heavily constructed, thus maintaining low weight.
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 design effectively reduces the strength required for the guide plate against external loads, stabilizes the guide plate's movement, and simplifies the sliding mechanism, while using resin materials to minimize mass and costs.
Implementation Method 1
a guide protrusion provided in the case to protrude parallel to the axis of the input shaft so as to be inserted into the guide recess, and configured to guide sliding of the guide recess
Implementation Method 2
a guide portion provided between the externally toothed gear wheel and the guide plate to guide movement of the externally toothed gear wheel relative to the guide plate
Implementation Method 3
an input shaft configured to be rotationally driven by an electric motor and having an eccentric shaft portion that is eccentric to an axis of the input shaft
Implementation Method 4
an output shaft rotatably supported on the case to be coaxial with the input shaft and having an internally toothed gear wheel, which has teeth more than teeth of the externally toothed gear wheel and is engaged with the externally toothed gear wheel
Data Source
AI summary
A speed reducer includes: a case; an input shaft rotationally driven by an electric motor and having an eccentric shaft portion; an externally toothed gear wheel rotatably supported on the eccentric shaft portion; an output shaft rotatably supported on the case coaxially with the input shaft and having an internally toothed gear wheel; a guide plate formed with a guide recess recessed parallel to the input shaft, and disposed between the input shaft and the externally toothed gear wheel; a guide protrusion provided in the case to protrude parallel to the input shaft to guide sliding of the recess; and a guide portion provided between the externally toothed gear wheel and the guide plate to guide movement of the externally toothed gear wheel relative to the guide plate, thereby guiding the externally toothed gear wheel so as to be revolvable but non-rotatable in cooperation with the recess and the protrusion.