Planetary Range-Change Transmission With Synchronized Shifting
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Solution Overview
Problem
Existing range-change transmission devices face inefficiencies in shifting and energy efficiency, particularly in the connection and synchronization of transmission elements, which limits their performance and increases wear.
Innovation Solution
A range-change transmission device with a planetary transmission system that includes multiple transmission elements and shifting units, allowing for optional connections and synchronization between the main shaft, output shaft, and transmission elements, utilizing form-fit and frictional connections to enhance shifting variety and reduce wear, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional shifting mechanisms are used to connect transmission elements, then the structure is simple, but shifting efficiency and energy efficiency are poor
Solution Approach 1:
The transmission system is divided into multiple independent shifting units (first shifting unit, second shifting unit, third shifting unit), each capable of independently connecting or disconnecting specific transmission elements. This segmentation allows selective engagement of only the necessary shifting mechanisms during operation, reducing energy loss and improving shifting efficiency by avoiding unnecessary mechanical interference.
Solution Approach 2:
The patent employs dynamically controllable connections between transmission elements through the shifting units. The connections can be established or released based on operational requirements, allowing the transmission system to adapt its configuration dynamically. This dynamic capability enables smoother shifts with less energy loss compared to static conventional mechanisms.
2Adaptability or versatility
If multiple shifting units are added to improve shifting variety, then adaptability increases, but device complexity increases
Solution Approach 1:
Each shifting unit is designed with multi-functionality to perform multiple operations. For example, the first shifting unit can connect the input shaft to both the first and second transmission elements, while also enabling disconnection. This universal design allows three shifting units to achieve seven different gear ratios, providing high adaptability without proportionally increasing structural complexity.
Solution Approach 2:
The patent combines multiple shifting functions into integrated shifting units that can simultaneously manage multiple transmission element connections. The shifting units are merged with the planetary transmission structure, allowing a compact arrangement where the same mechanical components serve both structural support and shifting control functions, thereby reducing overall device complexity.
3Reliability
If frictional connections are used to reduce wear, then connection smoothness improves, but energy efficiency decreases
Solution Approach 1:
The shifting units employ dynamically controllable frictional connections that can be adjusted during operation. The frictional engagement is applied selectively and temporarily during the shifting process to synchronize speeds, then released once the connection is established. This dynamic application minimizes energy loss while still providing the wear-reducing benefits of frictional synchronization during critical transition periods.
Solution Approach 2:
The frictional connections are used preliminarily during the shifting process to synchronize the rotational speeds of transmission elements before the final form-fit connection is established. This preliminary frictional action prepares the components for smooth engagement, reducing wear during the critical shifting phase, while the subsequent form-fit connection maintains energy efficiency during normal operation.
Data Source
AI summary
A range-change transmission device includes a main shaft, an output shaft, and a range-change unit. The range-change unit has at least one planetary gearbox, which includes at least one first gearbox element, at least one second gearbox element, and at least one third gearbox element. The range-change unit also has at least one shifting device, which is provided at least for the selective connection of the main shaft to the first gearbox element and/or to the second gearbox element.