Strain Wave Gear Speed Reducer Unit Compact Motor Integration
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Solution Overview
Problem
Existing strain wave gear speed reducers integrated with drive motors face issues of versatility, large size, and poor assembly workability due to the need for precise connection of individual components, leading to complexity and size constraints.
Innovation Solution
A strain wave gear speed reducer unit with a cylindrical casing, a ring-shaped internal gear, a flexible external gear, an elliptical cam, and a connecting part that is either integral with the cam or fixed to it, allowing for easy attachment to a motor in a compact configuration by reducing the number of components and improving assembly workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speed reducer and drive motor are formed integrally, then the device size is reduced, but versatility deteriorates and assembly workability worsens
Solution Approach 1:
The invention divides the integrated speed reducer-motor assembly into separable components: a standardized speed reducer unit and a motor unit. The speed reducer unit includes the wave generator, flex spline, circular spline, and casing as distinct modules that can be independently manufactured and assembled, enabling both compact integration and versatile application across different motor types.
2Volume of moving object
If the speed reducer and drive motor are formed integrally, then the device size is reduced, but assembly workability deteriorates
Solution Approach 1:
The speed reducer unit is pre-assembled as a complete functional module with the wave generator, flex spline, and circular spline positioned and secured within the casing before attachment to the motor. This preliminary assembly ensures proper alignment and positioning, eliminating the need for complex on-site alignment work when attaching to different motor types.
3Adaptability or versatility
If the drive motor and speed reducer are combined as individual members, then versatility is ensured, but the device size becomes large
Solution Approach 1:
The invention merges the speed reducer components (wave generator, flex spline, circular spline) into a single compact integrated unit with a unified casing. This merging reduces the overall volume by eliminating gaps and unnecessary spacing between components while maintaining the ability to separate the unit from different motor types for versatile application.
4Adaptability or versatility
If the drive motor and speed reducer are combined as individual members, then versatility is ensured, but connection accuracy requirements increase
Solution Approach 1:
The speed reducer unit incorporates self-aligning features including a standardized mounting interface with positioning protrusions that automatically align with corresponding recesses on the motor shaft. The flex spline's elastic properties also provide self-adjustment capability, accommodating minor misalignments without requiring high-precision machining, thereby reducing connection accuracy requirements while maintaining versatility.
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 enables easy and accurate attachment of the strain wave gear speed reducer unit to a motor in a compact size, enhancing versatility and assembly efficiency while maintaining a compact design.
Implementation Method 1
a flexible ring-shaped external gear that is disposed to the inside of the internal gear in a radial direction, an end of which is fixed to the casing on one side in the axial direction, and has external teeth that mesh with the internal teeth on an outer circumference, an elliptical cam that is disposed to the inside of the external gear in the radial direction and deforms the external gear in the radial direction by rotating together with a rotating shaft
Data Source
AI summary
A strain wave gear speed reducer unit includes: a casing extending in the axial direction; an internal gear disposed to be rotatable relative to the casing and having internal teeth on the inner circumference; a flexible external gear disposed to the inside of the internal gear in the radial direction, an end of which is fixed to the casing on one side in the axial direction, and which has external teeth on the outer circumference for meshing with the internal teeth; a cam disposed to the inside of the external gear in the radial direction and deforming the external gear in the radial direction by rotating together with a rotating shaft of a motor unit; a connecting part formed integrally with the cam and connected to the rotating shaft on the inside of the external gear; and a support connected to the casing and rotatably supporting the connecting part.