Multi-speed Planetary Transmission with Five Shift Elements
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Solution Overview
Problem
Existing multi-speed transmissions in planetary design require a high number of shift elements, leading to increased design complexity and internal transmission losses, resulting in higher consumption.
Innovation Solution
A multi-speed transmission design that utilizes only five shift elements and nine shafts to achieve at least nine forward gears and one reverse gear, with a shifting logic that keeps three shift elements closed during each gear step, minimizing consumption and simplifying construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high number of shift elements (at least six) are used to achieve nine forward gears and one reverse gear, then the transmission can realize the required gear steps, but the design complexity and manufacturing effort increase significantly
Solution Approach 1:
The patent combines multiple functions into fewer shift elements. Each shift element is designed to control multiple planetary gear sets simultaneously, allowing nine forward gears and one reverse gear to be achieved with only five shift elements instead of the conventional six or more. This merging reduces design complexity while maintaining full gear step adaptability
Solution Approach 2:
The shift elements are designed with universal functionality to operate across different planetary gear sets. Each shift element can engage or disengage multiple gear paths, making them multi-functional components that replace what would traditionally require separate dedicated shift elements for each gear step
2Adaptability or versatility
If at least six shift elements are used in the transmission, then all required gear steps can be achieved, but internal transmission losses increase due to at least three shift elements being open with each gear step
Solution Approach 1:
By merging the control of multiple planetary gear sets into single shift elements, the patent ensures that when one shift element is open, it controls multiple gear paths simultaneously. This reduces the total number of open shift elements at any given time from three (in conventional designs) to fewer, thereby minimizing internal transmission losses and energy consumption
3Adaptability or versatility
If at least five planetary gear sets and six shift elements are used, then nine forward gears and one reverse gear can be realized, but the construction becomes complex and production costs increase
Solution Approach 1:
The patent merges the functions of six or more shift elements into five optimized shift elements that work with five planetary gear sets. This reduction in component count simplifies the overall construction, making the transmission easier to manufacture and assemble while still achieving nine forward gears and one reverse gear
Solution Approach 2:
The patent extracts and eliminates redundant shift elements from the conventional design. By carefully analyzing which shift elements can be combined or removed without compromising gear step functionality, the design reduces the shift element count from six to five, simplifying construction and reducing production complexity
Data Source
AI summary
A multi-speed transmission in planetary design for a vehicle having a transmission housing (10); a first shaft (1), the first shaft (1) being a drive (An); a second shaft (2), the second shaft (2) being an output (Ab); at least five planetary gear sets (RS1, RS2, RS3, RS4, RS5); at least seven additional shafts (3, 4, 5, 6, 7, 8, 9); and five shift elements (SE1, SE2, SE3, SE4, SE5). Through actuation of the shift elements, at least nine forward gears (G1, G2, G3, G4, G5, G6, G7, G8, G9) and at least one reverse gear (R) are realized. For the realization of each gear, two of the shift elements are open and at least three of the shift elements (SE1, SE2, SE3, SE4, SE5) are closed.