Spline Wheel Contour Design for Roller-Type Wave Motion
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Solution Overview
Problem
Conventional spin-wave drivers face issues with driving accuracy and efficiency due to unclear V-shaped contour of spline apertures, leading to unstable speed and displacement of rollers, affecting the transmission of driving force during rotational movements.
Innovation Solution
The method involves designing a spline surface contour by slicing radial and circumference movement tracks of rollers to form circle centers and points of tangency, connecting these points to create single-sided tooth flanks, and mirroring them to form correspondent flanks, resulting in a spline wheel contour that ensures effective contact and force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If V-shaped contour of spline apertures is used, then manufacturing is simplified, but driving accuracy deteriorates due to unstable roller speed and displacement
Solution Approach 1:
The invention changes the geometric parameters of the spline aperture contour from a simple V-shape to a scientifically calculated contour based on roller movement trajectories. By modifying the contour shape parameters to match the actual roller motion path, the patent achieves both manufacturing feasibility and improved driving accuracy through precise geometric design.
Solution Approach 2:
The invention replaces the straight-line V-shaped contour with curved surfaces that follow the natural trajectory of roller movement. The spline aperture contour is designed with curved surfaces that match the spherical or arc-shaped path of roller centers, enabling smooth roller transitions and maintaining constant speed while improving driving accuracy.
2Force
If cam surface pushes rollers to contact tooth flank, then force transmission is achieved, but roller displacement becomes unstable affecting driving accuracy
Solution Approach 1:
The invention performs preliminary design of the spline aperture contour and cam surface geometry before assembly. By pre-calculating and pre-shaping the contact surfaces according to the desired roller movement trajectory, the system ensures that force transmission occurs along a controlled path, maintaining stable roller displacement and improving driving accuracy from the outset.
Solution Approach 2:
The invention introduces the spline aperture contour as an intermediary element between the cam surface and the tooth flank. This contour acts as a guide that mediates the interaction between the cam and rollers, ensuring that the force transmission path is controlled and that roller displacement remains stable during engagement.
3Device complexity
If conventional spin-wave driver design is used, then structure is simple, but speed reduction accuracy deteriorates due to unclear contour definition
Solution Approach 1:
The invention changes the geometric parameters of the spline aperture contour from conventional simple shapes to scientifically calculated contours. By modifying the contour shape parameters based on roller movement analysis, the patent achieves improved speed reduction accuracy while maintaining the overall simplicity of the spin-wave driver structure.
Data Source
AI summary
A method for designing a spline surface contour of a roller-type wave-motion includes of the steps of slicing radial movement track of a roller between a cam and a spline aperture and circumference rotation track at equal proportion at equal time intervals to sequentially obtain circle centers and points of tangency of the track circles during movement of the roller; connecting the points of tangency to form a unit cam circumference segment of a cam periphery in order to draw and form a single-sided tooth flank contour; and forming a correspondent side tooth flank contour by mirroring and projecting the single-sided tooth flank contour. A method of forming a spline wheel contour and a method of forming a cam periphery are obtained.