Electric Motor Speed Reducer Rotor Holder Support
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Solution Overview
Problem
Existing electric motor-attached speed reducers face issues with axial dimension reduction, leading to unwanted deformation and deflection due to unbalanced loads, as they rely on a single bearing to support the rotor yoke, which is not adequately stabilized.
Innovation Solution
The design incorporates a second bearing to support the rotor holder, a flexible external gear, and a non-perfect circular cam with an internal gear system, distributing the load and minimizing deformation and deflection through a strain wave gearing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the rotor yoke is supported by only one bearing of the wave generator, then the axial dimension is reduced, but unwanted deformation and deflection occur in the rotor yoke
Solution Approach 1:
The support function for the rotor holder is segmented into two separate bearings (second bearing and third bearing) positioned at different axial locations. This divides the single support point into multiple support points, reducing the load on each bearing and minimizing deformation and deflection of the rotor holder while maintaining a compact axial dimension.
2Device complexity
If a single bearing supports the rotor holder, then the device complexity is reduced, but the speed reduction mechanism becomes unstable due to deformation and deflection
Solution Approach 1:
The rotor holder serves as an intermediary component that is specifically supported by both the second bearing and third bearing. This intermediary structure allows the unbalanced load from the wave generator to be distributed to two bearings rather than one, stabilizing the speed reduction mechanism while maintaining relatively simple device complexity.
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
This configuration stabilizes the speed reduction mechanism by reducing deformation and deflection caused by unbalanced loads, enhancing the operational stability and reducing the axial dimension of the speed reducer.
Implementation Method 1
a flexible external gear arranged to be deformed in accordance with rotation of the non-perfect circular cam
Implementation Method 2
a third bearing being flexible and arranged between the non-perfect circular cam and the flexible external gear
Data Source
AI summary
An electric motor-attached speed reducer includes a first member, an electric motor, a speed reduction mechanism, and a second member. The electric motor is arranged to produce rotational motion with respect to the first member. The speed reduction mechanism is arranged to transfer the rotational motion obtained from the electric motor while reducing the speed thereof. The second member is arranged to rotate relative to the first member at a rotation rate resulting from the speed reduction. A first bearing is arranged between the first and second members. A second bearing is arranged between the first member and a rotor of the electric motor. The speed reduction mechanism includes a flexible third bearing arranged between a non-perfect circular cam and a flexible external gear. The second bearing is arranged to radially overlap with a rotor holder at a first axial position. The third bearing is arranged to radially overlap with the rotor holder at a second axial position different from the first axial position.