Planetary Gear Interference Fit Backlash Reduction
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Solution Overview
Problem
Power transmission devices used in continuous applications like solar and wind power generation face efficiency degradation due to friction-based resistance mechanisms, which also compromise the reverse driving prevention function and positioning accuracy.
Innovation Solution
An internally meshing planetary gear mechanism with an interference fit between the externally and internally toothed gears, which absorbs oscillating components and provides a strong reverse rotation prevention without generating backlash, ensuring high operating efficiency and accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction-based resistance mechanisms are used for reverse driving prevention, then reverse rotation prevention function is improved, but operating efficiency deteriorates due to friction losses
Solution Approach 1:
The patent replaces the friction-based mechanical resistance mechanism with a mechanical locking mechanism using a locking pin and locking hole. This substitution eliminates continuous friction losses during operation while maintaining reliable reverse driving prevention through positive mechanical engagement when needed.
Solution Approach 2:
The patent extracts the reverse driving prevention function from the continuous friction-based resistance mechanism and implements it as a discrete locking mechanism that engages only when reverse rotation is detected. This allows the main power transmission path to operate without friction losses during normal operation.
2Reliability
If friction-based resistance is applied continuously, then reverse driving prevention is maintained, but transmission efficiency deteriorates during continuous operation
Solution Approach 1:
The patent implements a dynamic locking mechanism where the locking pin can move between engaged and disengaged states based on operational needs. During forward operation, the locking pin is disengaged to allow efficient power transmission; when reverse rotation is detected, the locking pin engages to prevent reverse driving, thus adapting the resistance application dynamically.
3Ease of operation
If gear mechanism with backlash is used, then power transmission is achieved, but positioning accuracy deteriorates due to meshing backlash
Solution Approach 1:
The patent replaces the gear meshing mechanism with a direct mechanical connection using a locking pin that engages with a locking hole. This substitution eliminates the meshing backlash inherent in gear mechanisms while maintaining effective power transmission and significantly improving positioning accuracy through direct mechanical engagement.
4Reliability
If friction imparting means is added to reduce starting efficiency, then reverse rotation prevention is improved, but device complexity increases
Solution Approach 1:
The locking pin serves multiple functions: it prevents reverse driving through mechanical engagement, maintains positioning accuracy by eliminating backlash, and provides a simple starting resistance mechanism. This multi-functionality achieves reverse rotation prevention without adding separate friction imparting means, thus avoiding increased device complexity.
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 achieves high operating efficiency and effective reverse driving prevention, minimizing backlash and ensuring smooth operation and high positioning accuracy even in continuous applications with repeated starting/stopping or acceleration/deceleration.
Implementation Method 1
the externally toothed gear (54) is assembled to the internally toothed gear (60) in an interference fit
Data Source
AI summary
The power transmission device has an internally meshing planetary gear mechanism that has an input shaft, an eccentric body provided on the input shaft, an externally toothed gear eccentrically oscillating via the eccentric body, and an internally toothed gear with which the externally toothed gear internally meshes. The externally toothed gear is assembled to the internally toothed gear in an interference fit.