Multi-Speed Transmission With Planetary Gearsets
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Solution Overview
Problem
Current multiple speed transmissions face challenges in achieving a wide range of gear ratios with improved performance, cost efficiency, responsiveness, and packaging constraints, limiting their effectiveness in various applications.
Innovation Solution
The design incorporates multiple planetary gearsets and torque-transmitting mechanisms that are selectively engageable in combinations to establish at least ten forward and one reverse speed ratio, allowing for flexible gear shifting and efficient power transmission through a complex arrangement of planetary gearsets and interconnecting members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple planetary gearsets and torque-transmitting mechanisms are used to achieve ten or more speed ratios, then the number of gear ratios is improved, but the device complexity increases
Solution Approach 1:
The transmission system is divided into four distinct planetary gearsets (first, second, third, and fourth), each with sun gears, ring gears, and carrier members. This segmentation allows independent control and engagement of different gear elements through six separate torque-transmitting mechanisms, enabling the achievement of ten or more forward speed ratios and reverse speed ratios while managing complexity through modular organization
Solution Approach 2:
The planetary gearsets share common components and interconnections. For example, the ring gear of the first planetary gearset is continuously interconnected with the sun gear of the third planetary gearset, and the carrier member of the second planetary gearset is interconnected with the sun gear of the third planetary gearset. This multi-functionality allows the same components to serve multiple gear ratio functions, reducing the need for entirely separate mechanisms for each ratio
2Adaptability or versatility
If six torque-transmitting mechanisms are selectively engaged in combinations, then the versatility of speed ratios is improved, but the ease of operation deteriorates
Solution Approach 1:
The six torque-transmitting mechanisms are designed to be selectively engaged and disengaged during operation, allowing dynamic transition between different speed ratios. The continuous interconnections between planetary gearset components enable smooth shifting by progressively engaging or disengaging torque paths without requiring complete disassembly or complex manual intervention
Solution Approach 2:
The interconnecting members serve as intermediaries between the planetary gearsets. For example, the continuous interconnection between the ring gear of the first planetary gearset and the sun gear of the third planetary gearset, and between the carrier member of the second planetary gearset and the sun gear of the third planetary gearset, facilitates automatic torque transmission and simplifies the control logic for achieving desired speed ratios
Data Source
AI summary
The present disclosure provides a multiple speed transmission having an input member, an output member, a plurality of planetary gearsets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. Each of the plurality of planetary gearsets includes a sun gear, a ring gear, and a carrier member with pinion gears. The input member is continuously interconnected with at least one member of one of the plurality of planetary gear sets, and the output member is continuously interconnected with another member of one of the plurality of planetary gear sets. At least ten forward speeds and one reverse speed are achieved by the selective engagement of the plurality of torque-transmitting mechanisms.