Compound Harmonic Gear Motor Continuous Output Rotation
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Solution Overview
Problem
Existing compound harmonic gear motors have a limited range of rotational motion, restricting their application in machinery requiring continuous output rotation.
Innovation Solution
A compound harmonic gear motor design featuring a stationary shaft connected by first and second ground gears, a wave generator with a rotor and stator, a flex spline, and an output flange, allowing for continuous rotation around the stationary shaft, along with a rolling bearing and specific gear ratios to achieve a compound gear ratio, enabling broader and more efficient application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a compound harmonic gear motor is designed with traditional ground gears and wave generator, then high power density is achieved, but the output rotation range is limited
Solution Approach 1:
The ground gear is segmented into multiple sections (first ground gear section, second ground gear section) that can rotate relative to each other, allowing the output flange to achieve continuous rotation while maintaining the compact harmonic gear structure. This segmentation enables the output to rotate beyond the limited angle of traditional harmonic gears.
2Adaptability or versatility
If the wave generator outer surface is configured to rotate completely around the stationary shaft, then continuous output rotation is enabled, but the structural complexity increases
Solution Approach 1:
The first and second ground gear sections are merged with the stationary shaft through bearing connections, creating an integrated structure where the shaft serves as the rotation axis for both ground gear sections. This merging reduces the number of separate components and simplifies the overall structure while enabling continuous rotation.
Solution Approach 2:
The first ground gear section and second ground gear section are nested around the stationary shaft, with each section positioned at different axial locations. This nested arrangement allows both ground gear sections to rotate on the same shaft without interfering with each other, enabling continuous output rotation while maintaining a compact design.
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 enables continuous output rotation, enhancing the motor's application in earth moving equipment, power tools, and other machinery by providing a higher power density and efficient operation.
Implementation Method 1
a rolling bearing, the rolling bearing including: an inner race connected to the wave generator; an outer race connected to the flex spline; and rolling elements between the inner race and the outer race
Implementation Method 2
an output flange including internal teeth that mate with the flex spline to cause rotation of the output flange
Data Source
AI summary
Disclosed is a compound harmonic gear motor having: first and second ground gears connected by a stationary shaft; a wave generator including an outer surface that can rotate completely around the stationary shaft, the wave generator including a rotor and a stator, wherein rotation of the rotor causes rotation of the outer surface; a flex spline surrounding the outer surface of the wave generator that is driven to rotate by rotation of the outer surface of the wave generator; and an output flange including internal teeth that mate with the flex spline to cause rotation of the output flange completely around the stationary shaft.