Nutation Reducer Power-Split Layout for Higher Torque Density
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Solution Overview
Problem
Existing nutation reducers with joint bearings have complex structures, large volumes, and low power density, limiting their application in fields requiring high output torque and small volume, and they are inefficient mechanically.
Innovation Solution
A nutation reducer design featuring two pairs of nutation gear pairs with pre-stretched annular spring films and a tilted disc for power-split layout, which transforms nutation movement into single rotary motion, reducing volume and weight while increasing output torque and mechanical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If joint bearing is used to realize nutation movement, then nutation movement can be achieved, but the structure becomes complex and volume increases
Solution Approach 1:
The patent extracts and eliminates the joint bearing component from the system. Instead of using a joint bearing to achieve nutation movement, the invention uses a nutation gear pair where the nutation gear directly engages with a fixed non-nutation gear, removing the need for complex joint bearing structures while maintaining the nutation movement capability
Solution Approach 2:
The patent replaces the joint bearing mechanical system with a gear engagement system. The nutation gear and non-nutation gear engagement provides the nutation movement through pure mechanical gear interaction, substituting the joint bearing's function with a simpler gear-based mechanism
2Ease of operation
If joint bearing is used to realize nutation movement, then nutation movement can be achieved, but the volume becomes large
Solution Approach 1:
The patent removes the joint bearing component which occupies significant volume. The nutation gear pair structure replaces it with compact gear elements that achieve the same nutation movement function in a much smaller space
Solution Approach 2:
The patent merges the nutation movement function directly into the gear transmission system. The nutation gear is integrated with the output shaft, and its engagement with the non-nutation gear provides both transmission and nutation functions in a unified compact structure
3Ease of operation
If joint bearing is used to realize nutation movement, then nutation movement can be achieved, but the power density becomes low
Solution Approach 1:
The patent removes the joint bearing which has low mechanical efficiency and power density. The gear-based nutation mechanism replaces it with high-efficiency gear engagement that provides superior power transmission capability
Solution Approach 2:
The patent changes the mechanical efficiency parameter by replacing the joint bearing with a gear engagement system. The gear teeth engagement provides higher friction efficiency and power transmission capability, significantly improving the overall power density of the reducer
4Force
If output torque is doubled in existing nutation reducer, then output torque increases, but volume must also be doubled
Solution Approach 1:
The patent uses two pairs of nutation gear pairs arranged symmetrically on opposite sides of the nutation generating mechanism. This segmentation allows the output torque to be doubled by adding another gear pair rather than enlarging the entire structure, achieving torque multiplication without proportional volume increase
Solution Approach 2:
The patent transitions from a single gear pair to multiple gear pairs arranged in a spatial configuration. By utilizing the spatial dimension and symmetric arrangement, the system doubles the output torque through parallel torque contributions from multiple gear pairs without requiring a proportional increase in overall volume
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 allows for a 100% increase in output torque with a 30-40% increase in volume, significantly reducing friction loss and equipment heating, improving power density and efficiency, making it suitable for applications requiring high power density and low volume.
Implementation Method 1
when said nutation gear performs nutation movement, said annular spring film transforms the nutation movement of said nutation gear into single rotary movement of said output shaft by means of an elastic deformation of the annular elastic portion
Data Source
AI summary
A nutation reducer includes: a case, two pairs of nutation gear pairs, each pair being disposed in the case and composed of a nutation gear and non-nutation gear in engagement, and the non-nutation gear being fixed in the case or integrated formed in the case; an output shaft, rotationally disposed in the case; two annular spring films, each nutation gear of the gear pair is connected to the output shaft through one annular spring film; a nutation generating mechanism disposed in the case, two nutation gear pairs being respectively disposed on both sides of the nutation generating mechanism. Power-split arrangement is applied in this application, symmetric layout of the nutation gear pairs is adopted. In this way, the working efficiency of the reducer is obviously improved, meanwhile the volume and weight of the reducer, and the heat generated in working process are reduced, and power density is improved.