Wave Gear Speed Reducer Motor Unit Integration
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Solution Overview
Problem
Existing wave gear speed reducers with integrated drive motors face challenges in versatility due to the need for custom designs and result in large, compact devices when separate motor and speed reducer units are combined.
Innovation Solution
A motor unit for a wave gear speed reducer is designed with a cylindrical casing, a rotatable ring-shaped internal gear, a flexible external gear, and an elliptical cam that deforms the external gear, allowing for a compact attachment to the wave gear speed reducer, incorporating a rotary shaft unit, rotor unit, stator unit, and a motor casing with a support unit to facilitate easy integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speed reducer and drive motor are formed integrally, then the size of the entire device is made compact, but it is necessary to individually design a dedicated speed reducer and drive motor which reduces versatility
Solution Approach 1:
The patent divides the integrated motor-speed reducer system into separate modular components: a motor unit with motor casing, rotor, stator, and rotary shaft, and a wave gear speed reducer unit with casing, wave generator, flex spline, and circular spline. This segmentation allows each unit to be designed and manufactured independently while maintaining compact integration through standardized coupling interfaces, thus achieving both compact size and versatility.
2Adaptability or versatility
If the drive motor and speed reducer are combined as individual members, then versatility of the speed reducer can be ensured, but the size of the entire device becomes large
Solution Approach 1:
The patent merges the motor unit and wave gear speed reducer unit into a compact integrated assembly through standardized coupling interfaces. The motor casing and speed reducer casing are designed to fit together closely, with the rotary shaft of the motor directly coupling to the wave generator. This merging reduces the overall device size while maintaining the versatility of the speed reducer through standardized components.
3Ease of operation
If a coupling unit is used to connect the rotation shaft to the wave gear speed reducer, then the connection is achieved, but the length of the entire device becomes longer
Solution Approach 1:
The patent implements a nested configuration where the motor unit is positioned inside or adjacent to the wave gear speed reducer casing, with the rotary shaft extending through the motor casing to directly couple with the wave generator. This nesting eliminates the need for external coupling units and reduces the overall length of the device by utilizing the internal space of the speed reducer housing.
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 motor unit achieves a compact size configuration while ensuring versatility, allowing for efficient speed reduction and output, suitable for applications like robot joints and electric wheelchair wheels.
Implementation Method 1
a wave generator, a flexible flex spline formed in a circular shape coming in contact with the wave generator via a bearing positioned on the outer circumference of the wave generator having spline-shaped teeth on its outer circumference, and a circular spline having a larger number of spline teeth in a ring shape than the number of teeth of the flex spline which mesh and engage with the outer circumference of the flex spline
Data Source
AI summary
A power unit comprises: a wave gear speed reducer, a rotary shaft extending in the axial direction; a rotor unit that rotates integrally with the rotary shaft; a stator unit disposed facing the rotor unit; and a motor casing to which the stator unit is secured. The motor casing has a second cover that covers the rotor unit and the stator unit from the other side in the axial direction. The rotary shaft extends toward the other side in the axial direction, penetrates the second cover, and is connected to a cam. The second cover has a support part that extends toward the other side in the axial direction, supports the rotary shaft in a rotatable manner, and is positioned in a flexible cylindrical part of an external gear.