Multi-Stage Planetary Roller Transmission With Balanced Clearance
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Solution Overview
Problem
Multi-stage planetary roller power transmission devices face reduced lifespan due to heat generation in high-speed mechanisms, leading to the need for multiple component types with different dimensions, increasing complexity and costs.
Innovation Solution
The design employs identical components for both high-speed and low-speed mechanisms by maintaining equal clearance amounts and adjusting the number of planetary rollers, allowing for reduced pressing force in high-speed components, thus extending the lifespan while minimizing the variety of components needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same clearance amount is used for both high-speed and low-speed mechanisms, then the component dimensions can be standardized, but the heat generation in high-speed mechanisms increases, reducing lifespan
Solution Approach 1:
The patent applies different clearance amounts to different stages based on their specific operating conditions. The high-speed mechanism uses a smaller clearance amount (first negative clearance) while the low-speed mechanism uses a larger clearance amount (second negative clearance), allowing each stage to be optimized for its local requirements rather than using a uniform clearance throughout the system.
2Reliability
If different clearance amounts are used for high-speed and low-speed mechanisms, then the lifespan of high-speed mechanism is extended, but the number of component types increases
Solution Approach 1:
The patent changes the clearance parameter differently for high-speed and low-speed mechanisms. By adjusting the clearance amount based on the operating speed and load conditions of each mechanism, the patent optimizes performance and lifespan without requiring completely different component designs, thus managing complexity while achieving reliability improvements.
3Productivity
If the pressing force is increased to improve power transmission, then the transmission efficiency improves, but the heat generation and wear increase, reducing lifespan
Solution Approach 1:
The patent applies different clearance amounts to different stages based on their specific operating conditions. The high-speed mechanism uses a smaller clearance amount (first negative clearance) while the low-speed mechanism uses a larger clearance amount (second negative clearance), allowing each stage to be optimized for its local requirements rather than using a uniform clearance throughout the system.
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
This approach extends the lifespan of the high-speed mechanism and the entire device while reducing the number of component types required, simplifying production and maintenance.
Implementation Method 1
Rotational power of the sun shaft 112 is transmitted to each of the planetary rollers 113 by the shearing force of the traction oil
Data Source
AI summary
A multi-stage planetary roller power transmission device includes a high-speed power transmission mechanism including a first sun shaft, a first fixed ring, first planetary rollers disposed between the first sun shaft and the first fixed ring with a first negative clearance, first support shafts, and an annular first carrier into which the first support shafts are press-fitted; and a low-speed power transmission mechanism including a second sun shaft, a second fixed ring, second planetary rollers disposed between the second sun shaft and the second fixed ring with a second negative clearance, second support shafts, and an annular second carrier into which the second support shafts are press-fitted. A clearance amount of the first negative clearance and a clearance amount of the second negative clearance are equal to each other, and the number of the first planetary rollers is smaller than the number of the second planetary rollers.