Circumferential Gear Speed Reducer for Compact High-Ratio Transmission
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Solution Overview
Problem
Hydro-static transmissions have lower power transmission efficiency compared to gear-based speed reduction mechanisms, and gear-based mechanisms become bulky in the axial direction when trying to achieve high reduction ratios, which is disadvantageous for compact layouts in applications like travel driving of working machines.
Innovation Solution
A compact speed reduction mechanism using a plurality of gears arranged in a circumferential direction, with large and small diameter gears alternately positioned in the axial direction, allowing for efficient power transmission and reduced axial size, and optimizing gear placement to improve lubrication with minimal lubricant oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a high reduction ratio is achieved using traditional gear-based speed reduction mechanisms, then the power transmission efficiency is improved, but the axial size becomes bulky
Solution Approach 1:
The patent transitions from a conventional axial arrangement of gears to a circumferential arrangement where multiple transmission gears are positioned around the input shaft in a radial pattern. This dimensional change allows the reduction mechanism to achieve high reduction ratios without increasing axial length, as the gears are distributed in the circumferential direction rather than stacked axially.
Solution Approach 2:
The patent employs a compact nested structure where multiple transmission gears with different reduction ratios are arranged concentrically around the input shaft. The gears are positioned in overlapping radial zones, allowing them to share common structural space and support elements, thereby achieving high reduction ratios without proportional increases in axial dimensions.
2Loss of energy
If the number of transmission stages is increased to achieve high reduction ratio, then the power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple transmission stages into a single circumferential arrangement around the input shaft. Multiple transmission gears are positioned adjacent to each other in the circumferential direction, sharing common support structures and lubrication systems. This merging approach achieves high reduction ratios through multiple stages while reducing overall structural complexity compared to sequential axial staging.
3Length of moving object
If a compact axial size is achieved, then the adaptability for compact layouts is improved, but the lubrication effectiveness deteriorates
Solution Approach 1:
The patent implements a lubrication system tailored to the circumferential gear arrangement, with lubricant supply paths and oil holes positioned to target each transmission gear's meshing zone individually. This localized lubrication approach ensures adequate lubrication delivery to all gears despite their compact circumferential positioning, maintaining lubrication effectiveness while achieving compact axial dimensions.
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 mechanism achieves a compact axial size and improved lubrication properties while maintaining efficient power transmission, addressing the bulkiness and efficiency issues of traditional gear-based systems.
Implementation Method 1
a plurality of gears configured to transmit a driving force input to the input shaft to the output shaft
Data Source
AI summary
A speed reduction mechanism comprises an output shaft and a plurality of gears. The output shaft is arranged on the same axis as an input shaft. The plurality of gears transmit a driving force input to the input shaft to the output shaft. The plurality of gears include an input gear provided on the input shaft, an output gear provided on the output shaft, and a plurality of transmission gears arranged side by side in a circumferential direction of the input shaft.