Multi-Linkage Planetary Gear Assembly for Wider Speed Ratios
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Solution Overview
Problem
Existing multi-linkage planetary gear speed changing mechanisms face limitations in achieving a wide range of gear ratios due to assembly conditions and meshing errors, making it difficult to design and manufacture mechanisms with complex gear arrangements, such as those required for automobiles, which increases manufacturing costs and maintenance difficulties.
Innovation Solution
A design and manufacturing method that involves tooth alignment calculations using specific formulas to determine baseline and tooth difference angles, allowing for precise positioning and assembly of planetary gear sets, breaking through assembly condition limitations and enabling the creation of multi-linkage mechanisms with various speed ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If assembly condition is applied to multi-linkage planetary gear speed changing mechanism, then design complexity increases, but designable speed ratio range is limited
Solution Approach 1:
The invention divides the multi-linkage planetary gear mechanism into multiple independent planetary gear sets, each satisfying the assembly condition individually. By segmenting the complex mechanism into manageable units, the design complexity is reduced while expanding the designable speed ratio range, as each segment can be independently optimized.
Solution Approach 2:
The invention introduces a new dimension of design freedom by allowing different planetary gear sets to have different numbers of teeth that are not constrained by the traditional assembly condition. This dimensional change in the design space enables achieving speed ratios beyond the conventional limits while maintaining manageable complexity through modular design.
2Adaptability or versatility
If two sets of planetary gears are assembled and fixedly connected to realize tooth alignment by assembly, then multi-linkage mechanism is achieved, but meshing error becomes very serious
Solution Approach 1:
The invention applies preliminary action by pre-calculating and pre-positioning the tooth alignment during the design and manufacturing phase. Each planetary gear set is manufactured with precisely controlled tooth positions based on calculated baseline angles, eliminating the need for post-assembly alignment adjustments and significantly reducing meshing errors in the multi-linkage mechanism.
Solution Approach 2:
The invention changes the critical parameter of tooth position from being determined by assembly tolerance to being determined by precise manufacturing parameters. By calculating and controlling the baseline angle and tooth difference angle during manufacturing, the meshing error is minimized while maintaining the multi-linkage mechanism's adaptability.
3Adaptability or versatility
If addendum modification is applied to meet speed ratio requirements, then gear ratio can be adjusted, but design becomes complicated with many variable relationships
Solution Approach 1:
The invention changes the approach to gear ratio adjustment from addendum modification to changing the number of teeth parameter. By directly adjusting the number of teeth in different planetary gear sets based on calculated relationships, the gear ratio can be optimized without the complicated variable relationships and constraints associated with addendum modification coefficients.
Data Source
AI summary
The invention relates to a design method and a manufacturing method of a multi-linkage planetary gear speed changing mechanism and a gear speed changing mechanism, a planetary gear set is designed in a specific calculation mode in combination with different processing and assembling modes, by positioning and assembling the planetary gear set, the limitation of assembly condition of the multi-linkage planetary gear speed changing mechanism is broken through, and the assembled and manufactured multi-linkage planetary gear speed changing mechanism can obtain different speed ratios according to different transmission requirements, so that an application of the multi-linkage planetary gear speed changing mechanism is expanded.