Face Gear Ball Spline Support for Uniform Output Torque
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Solution Overview
Problem
Existing speed reducing apparatuses face issues with nonuniformity in output torque due to machining errors and wear of the first and second face gears, and they struggle with coaxial accuracy between the first face gear and the inner ring of the spline portion.
Innovation Solution
The proposed speed reducing or increasing apparatus incorporates a ball spline portion that supports the first face gear in an inclinable manner, allowing axial displacement and enhancing coaxial accuracy, thereby ensuring the first and second face gears remain meshed and preventing nonuniformity in output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first face gear and the inner ring of the spline portion are coupled by a fastening member, then the assembly is secured, but coaxial accuracy between the first face gear and the inner ring is reduced
Solution Approach 1:
The first face gear and the inner ring of the ball spline portion are merged into a single integrated component. This eliminates the need for fastening members and the associated alignment errors, thereby maintaining high coaxial accuracy while ensuring assembly security through the unified structure.
2Manufacturing precision
If the first face gear is rigidly fixed, then positioning is precise, but the ability to accommodate machining errors and wear is reduced
Solution Approach 1:
The ball spline portion is designed to allow dynamic axial displacement of the first face gear. This dynamic capability enables the system to accommodate machining errors and wear by adjusting the axial position, while the ball spline mechanism maintains precise positioning control during operation.
3Reliability
If the face gears are allowed to displace axially, then tolerance to machining errors is improved, but positioning precision is reduced
Solution Approach 1:
The ball spline portion enables controlled axial displacement that allows the first face gear to accommodate machining errors and wear. The displacement is regulated by the ball spline mechanism, which maintains positioning precision by preventing uncontrolled movement while allowing necessary adjustment for tolerance compensation.
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 ball spline portion allows the first face gear to oscillate and maintain meshing with the second face gear, preventing nonuniformity in output torque and enhancing coaxial accuracy, which contributes to a more efficient and consistent speed reduction or increase process.
Implementation Method 1
a ball spline portion (3) allowing axial displacement of the first face gear (1), in which the ball spline portion (3) includes an outer ring (4), an inner ring (6), a ball (5) capable of rolling along a ball groove (4a) of the outer ring (4) and a ball groove (6a) of the inner ring (6)
Data Source
AI summary
A speed reducing apparatus is provided which can prevent nonuniformity from occurring in output torque. A speed reducing apparatus that causes a first face gear to incline in such a manner as to mesh with a second face gear and causes the first face gear to oscillate in such a manner as to move a meshing portion in a circumferential direction includes a ball spline portion that supports the first face gear in an inclinable manner. The ball spline portion includes an outer ring, an inner ring, a ball capable of rolling along a ball groove of the outer ring and a ball groove of the inner ring, and a cage having a pocket in which the ball is incorporated, and allows axial displacement of the first face gear.