Split-Rigid-Gear Harmonic Reducer for Interference-Free Meshing
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Solution Overview
Problem
Conventional harmonic speed reducers with two rigid gears suffer from low mesh efficiency and shortened lifespan due to interference issues between deformed flexible gear structures and rigid gears, leading to reduced performance and durability.
Innovation Solution
The design includes a wave generator, flexible gear with first and second outer gear structures and a division groove, and two rigid gears with specific inner gear structures, where the first angle between the intersection line and central axis is between 0.1 to 5 degrees, and the second angle is similarly defined, enhancing mesh efficiency between the flexible gear and rigid gears through precise geometric configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the flexible gear is mounted onto the outer periphery of the wave generator, then the harmonic speed reducer can transmit power and reduce speed, but the outer gear structure deforms and causes interference with the rigid gears, decreasing mesh efficiency and lifespan
Solution Approach 1:
The flexible gear is divided into two separate rigid gears (first rigid gear and second rigid gear) with a division groove between them. This segmentation eliminates the interference issue between the flexible gear and single rigid gear, allowing both gears to mesh properly with their respective inner gear structures without collision, thereby maintaining high mesh efficiency and extending lifespan while preserving power transmission capability
Solution Approach 2:
The division groove acts as an intermediary element between the first and second rigid gears. It provides spatial separation and prevents interference between the two rigid gears and the wave generator, enabling both gears to operate simultaneously without collision while maintaining proper meshing with the flexible gear's outer gear structures
2Power
If the first rigid gear and second rigid gear are positioned close to each other, then the carrying capacity is increased, but axial movement and shaking occur during operation, reducing stability
Solution Approach 1:
The first rigid gear and second rigid gear are designed as counterbalancing elements that support each other axially. When positioned close to each other, they provide mutual support that counteracts axial movement and shaking forces, maintaining stability while increasing carrying capacity. The symmetric arrangement of the two rigid gears creates a balanced structure that resists axial disturbances
Data Source
AI summary
A harmonic speed reducer is provided. The harmonic speed reducer includes a wave generator, a flexible gear, a first rigid gear, and a second rigid gear. The wave generator can be driven to rotate relative to a central axis. The flexible gear has a plurality of first outer gear structures, a division groove, and a plurality of second outer gear structures. The first rigid gear has a plurality of first inner gear structures configured to be engaged with the first outer gear structures. The second rigid gear has a plurality of second inner gear structures configured to be engaged with the second outer gear structures. A first intersection line is defined between each of the first inner gear structures and a sectional surface. An angle between the first intersection line and a first horizontal line is within a range from 0.1 degrees to 5 degrees.