Multi-Speed Transmission Design for Compact Vehicle Powertrains
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Solution Overview
Problem
Existing multi-speed transmissions for motor vehicles, which utilize five planetary gear sets and six shifting elements, are limited in their ability to provide a compact design with low component stresses and high gear meshing efficiency while achieving a sufficient number of forward and reverse gears.
Innovation Solution
A transmission design incorporating five planetary gear sets and six shifting elements, where specific connections and actuations between the gear sets allow for the realization of ten forward gears and two reverse gears, with a compact design, low component stresses, and high gear meshing efficiency, utilizing a combination of permanent and actuated conjointly rotating connections and shifting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If five planetary gear sets and six shifting elements are used to achieve multiple forward and reverse gears, then the number of gears is increased, but the device complexity and component stresses increase
Solution Approach 1:
The transmission is divided into five separate planetary gear sets (first through fifth), each capable of independent operation. This segmentation allows the system to achieve multiple gear ratios (ten forward gears and two reverse gears) by selectively engaging different planetary gear sets and their elements, rather than using a single complex gear train.
Solution Approach 2:
The patent employs six shifting elements that can dynamically engage and disengage to change the power flow paths through the planetary gear sets. This dynamic reconfiguration allows the transmission to adapt between different gear ratios and operating modes (forward/reverse) without physical reconfiguration of the gear sets themselves.
2Volume of moving object
If five planetary gear sets are used to achieve compact design, then the transmission size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The five planetary gear sets are arranged in a nested or compact configuration where multiple gear sets share common components and space. This nesting approach achieves a compact transmission design by utilizing the radial and axial space efficiently, with planetary carriers and gear elements from different sets interacting in a space-saving manner.
Solution Approach 2:
Multiple planetary gear sets share common components such as the transmission input, transmission output, and non-rotating components. This merging of components across different gear sets reduces the overall transmission size while maintaining the capability for multiple gear ratios.
3Speed
If variable power flows are established through selective actuation of shifting elements, then gear shifting speed is improved, but the reliability requirements increase
Solution Approach 1:
The six shifting elements enable dynamic reconfiguration of power flow paths through the five planetary gear sets. By selectively actuating these shifting elements, the transmission can rapidly shift between different gear ratios and operating modes, achieving fast gear changes while maintaining reliable power transmission through the mechanical engagement of gear elements.
Data Source
AI summary
A transmission (G) for a motor vehicle which has a transmission input (GW1-A), a transmission output (GW2-A), five planetary gear sets (P1, P2, P3, P4, P5) and six shifting elements (B1, B2, K1, K2, K3, B3). By selectively actuating the six shifting elements (B1, B2, K1, K2, K3, B3), ten forward gears and one reverse gear can be selected between the transmission input (GW1-A) and the transmission output (GW2-A). Further, the drive train is typically incorporated into a motor vehicle.