Pericyclic Transmission Layout for Balanced Nutating Gears
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Solution Overview
Problem
Pericyclic transmissions generate fluctuating axial forces due to unbalance of intermediate gears, requiring a large number of gears and increased transmission size to balance, which is inefficient and not suitable for high input speeds.
Innovation Solution
A pericyclic transmission design that reduces the number of gears by using a centric mounted intermediate gear pair with inclined bearing seats, allowing for nutating motion without rotation, and output configurations that cancel unbalancing moments, achieving balanced operation with fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional pericyclic transmission uses multiple intermediate gears to balance unbalancing moments, then the transmission achieves balanced operation, but the number of gears increases and the transmission size increases
Solution Approach 1:
The patent extracts and eliminates the need for multiple intermediate balancing gears by using a different configuration. The solution takes out the redundant components (extra intermediate gears) while maintaining the balancing function through a modified gear arrangement where the intermediate gears are directly mounted on the output shaft, allowing their axes to coincide and naturally balance moments without requiring additional gears.
Solution Approach 2:
The patent merges the functions of the intermediate gears by having them share a common mounting location on the output shaft. This combining of mounting positions allows the intermediate gears to work together to balance unbalancing moments while reducing the total number of gears needed, as their axes coincide and they collectively provide the balancing effect.
2Stability of the object's composition
If a pericyclic transmission uses a large number of gears to cancel unbalancing moments, then the transmission achieves balanced operation, but the transmission size increases
Solution Approach 1:
The patent removes the need for additional space-consuming gears by extracting the essential balancing function and achieving it through a compact configuration where intermediate gears are mounted on the output shaft with coinciding axes, eliminating the volume increase that would result from adding more gears.
3Reliability
If a pericyclic transmission uses conventional gear arrangement, then the teeth can mesh properly, but unbalancing moments are generated due to nutating motion
Solution Approach 1:
The patent introduces asymmetry in the gear arrangement by having intermediate gears with different numbers of teeth (e.g., 40 and 42 teeth) while maintaining proper meshing. This asymmetric configuration, combined with mounting both intermediate gears on the output shaft with coinciding axes, allows the system to generate balancing effects that cancel unbalancing moments while preserving reliable tooth meshing conditions.
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 solution effectively cancels unbalancing moments with a reduced number of gears, providing a compact and efficient transmission suitable for high input speeds without structural vibrations, suitable for applications like electric vehicle drives.
Implementation Method 1
whereby upon rotation of the input shaft, the input gear performs at least a nutating motion
Data Source
AI summary
Pericyclic transmission having at least one input shaft (58) rotatable about an axis of rotation and at least one inclined bearing seat (55, 56) secured to the input shaft with the inclined bearing seat being oriented at an inclination angle with respect to the axis of rotation of the input shaft. An input gear (52, 54) is attached to each inclined bearing seat with the input gear being oriented at the inclination angle and having an axis of rotation inclined to the axis of rotation of the input shaft by the inclination angle whereby upon rotation of the input shaft, the input gear performs at least a nutating motion. The transmission also includes an intermediate gear (51, 53) in mesh with the input gear with the intermediate gear having an axis of rotation coincident with the axis of rotation of the input shaft. The intermediate gear communicates with a transmission output.