Compact Multi-Stage Gear with Nested Wave Generator
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Solution Overview
Problem
Existing multi-stage gears with planetary and strain wave gears lack compactness, stability, and the ability to absorb high tilting torques, particularly in the axial direction, while also experiencing wear issues and requiring complex structural designs.
Innovation Solution
A multi-stage gear design where the wave generator is installed radially on a ring gear of the planetary gear, with roller bearings for stability and low wear, and the planetary gear and strain wave gear share a common longitudinal axis, allowing for compact integration and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wave generator is supported exclusively on the single planetary carrier, then the structure is simple, but the axial structural length increases and compactness is reduced
Solution Approach 1:
The wave generator is installed radially on the ring gear, nested within the planetary gear structure. The wave generator is positioned inside the ring gear's radial space, utilizing the existing structural envelope without requiring additional axial length. This nesting approach allows the wave generator to be supported by the ring gear rather than requiring a separate support structure extending axially.
Solution Approach 2:
The support relationship transitions from axial support (wave generator supported on planetary carrier along the axial direction) to radial support (wave generator supported on ring gear in the radial direction). This dimensional change allows the wave generator to be positioned radially within the ring gear's tooth space, eliminating the need for extended axial support structures.
2Stability of the object's composition
If the planetary wheels mesh with both sun wheel and internally toothed ring gear, then the planetary gear is stable, but the overall structure becomes less compact when ring gear is arranged next to strain wave gear
Solution Approach 1:
The ring gear is merged with the wave generator support structure, combining two functions into a single component. The ring gear serves both as the meshing element for planetary wheels and as the support structure for the wave generator, eliminating the need for a separate axial support structure and reducing overall axial length.
Solution Approach 2:
The wave generator is nested radially within the ring gear structure, positioned inside the ring gear's radial envelope. This nesting allows the wave generator to be supported by the ring gear without requiring additional axial space, maintaining planetary gear stability while achieving compact axial dimensions.
3Ease of manufacture
If standard planetary drives are used, then manufacturing is easier, but the ability to absorb high tilting torques and axial stability is reduced
Solution Approach 1:
The wave generator is designed with radial adjustability on the ring gear, allowing dynamic adaptation to tilting torque loads. The radial support configuration enables the wave generator to accommodate axial misalignments and tilting moments while maintaining proper meshing conditions, enhancing reliability without complicating manufacturing.
Solution Approach 2:
The ring gear is designed with specific local features to support the wave generator radially, such as radial bores or mounting surfaces positioned at strategic locations. This localized structural modification maintains the overall simplicity of standard planetary drives while providing enhanced axial stability and tilting torque absorption capabilities where needed.
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 achieves a compact, stable, and low-wear multi-stage gear capable of absorbing high tilting torques, with reduced manufacturing workload and costs, while maintaining high angular torque transmission capabilities.
Implementation Method 1
the wave generator is installed with at least one roller bearing on the ring gear of the planetary gear
Implementation Method 2
the multi-stage gear according to the invention becomes particularly stable and low-wear
Data Source
AI summary
A multi-stage gear is provided with a planetary gear and a strain wave gear adjacent to the multi-stage gear, wherein a output of the planetary gear maintains a drive connection with a wave generator of the strain wave gear, and wherein the planetary gear is arranged at least partially radially within the strain wave gear. It is provided that the wave generator is mounted radially on a ring gear of the planetary gear.