Inline Manual Transmission with Dual Constant Torque Paths
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Solution Overview
Problem
Existing manual transmissions face challenges in achieving a large range of different gear transmissions while maintaining a simple and compact structure, particularly due to issues with drive and output constants affecting the realization of higher and lower gears.
Innovation Solution
The manual transmission employs a gear pairing on both the drive and output sides, allowing drive torque to be transmitted over either side independently of the drive or output constants for specific gears, enabling a wide range of transmission ratios without relying on constant values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large drive constant is used in the gear pairing on the drive side, then the efficiency and gearing forces of lower gears are improved, but the realization of highest gear with small transmission ratio becomes difficult
Solution Approach 1:
The transmission system is segmented into two independent constant paths: drive constant (input shaft to first intermediate shaft) and output constant (second intermediate shaft to output shaft). This segmentation allows each constant to be optimized for different gear ranges, with drive constant optimizing lower gears and output constant enabling highest gear realization.
Solution Approach 2:
The first and second intermediate shafts act as intermediary elements that decouple the drive constant and output constant paths. This mediation enables independent optimization of each constant without direct interference, allowing the system to achieve both high efficiency in lower gears and appropriate ratios in highest gear.
2Adaptability or versatility
If a small drive constant is selected, then the design freedom for higher gears is increased, but the efficiency and gearing forces of lower gears are compromised
Solution Approach 1:
The transmission system is divided into two independent constant paths, allowing the drive constant to be optimized for lower gear efficiency while the output constant provides design freedom for higher gears. This segmentation eliminates the trade-off by distributing optimization responsibilities to different constants.
Solution Approach 2:
Different constants are applied to different parts of the transmission range: drive constant optimizes the quality of lower gears for efficiency, while output constant optimizes the quality of higher gears for design freedom and ratio appropriateness.
3Speed
If a large output constant is used, then the intermediate shaft rotates rapidly improving gear switching ability, but the overall transmission ratios of individual gears become difficult to control
Solution Approach 1:
The transmission system segments the constant paths so that output constant affects only the output side (second intermediate shaft to output shaft), while drive constant controls the input side. This segmentation allows output constant to be optimized for intermediate shaft speed without compromising overall transmission ratio control, as drive constant compensates for ratio requirements.
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 configuration allows for a simple, compact manual transmission with a broad range of gear ratios, including a 7-speed transmission that can be modified to a 6-speed by omitting the crawler gear, while ensuring efficient torque transmission across various gears.
Implementation Method 1
The gear pairing on the drive side has a drive gear, rotationally fixed on the input shaft and a first intermediate gear, rotationally fixed on the first intermediate shaft, while the gear pairing on the output side has a second intermediate gear, rotationally fixed on the second intermediate shaft and a driven gear, which is rotationally fixed on the output shaft
Data Source
AI summary
A manual transmission includes a coaxially arranged input shaft and output shaft, a first intermediate shaft and parallel second intermediate shaft, spaced from the input shaft, a drive side gear pair with a drive gear rotationally fixed on the input shaft and an intermediate gear rotationally fixed on the first intermediate shaft, and an output side gear pair with a second intermediate gear rotationally fixed on the second intermediate shaft and an output gear rotationally fixed on the output shaft, wherein, drive torque is transferred from the input shaft to the output shaft over the drive side gear pair, while no drive torque is transferred over the output side gear pair and, with at least three other switchable gears, drive torque is transmitted from the input shaft to the output shaft over the output side gear pair, while no drive torque is transmitted over the drive side gear pair.