Hybrid Transmission Shifting Elements and Planetary Gear
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Solution Overview
Problem
Existing hybrid drive transmissions are complex, heavy, and expensive, requiring a need for reduced mechanical complexity, space, and weight while maintaining efficient operation and flexibility in transmission ratios.
Innovation Solution
A transmission design with multiple shifting elements, including planetary gears and clutches, allows for flexible coupling and decoupling of drive units, enabling various operating modes and seamless gear changes without traction interruption, using a combination of clutches and fixed point connections to achieve multiple transmission ratios and support different drive unit configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-clutch transmission is used to enable hybrid vehicle operation with multiple drive units, then the transmission can operate with internal combustion engine, electric motor and both drive units together, but the transmission becomes complex, heavy and expensive
Solution Approach 1:
The transmission is divided into multiple independent shafts (input shaft, first transmission shaft, second transmission shaft, third transmission shaft, output shaft) that can be selectively connected through shifting elements. This segmentation allows each shaft to handle specific functions, reducing the complexity of any single shaft while maintaining overall system versatility.
Solution Approach 2:
The transmission employs shift elements (clutches and brakes) that dynamically connect and disconnect different shafts and components based on operating conditions. This dynamic reconfiguration enables the transmission to adapt between different drive modes (engine-only, electric-only, hybrid) without requiring a permanently complex mechanical structure for all modes simultaneously.
2Adaptability or versatility
If multiple shifting elements and planetary gears are used to achieve multiple transmission ratios, then the transmission can provide various operating modes, but the mechanical complexity increases
Solution Approach 1:
The planetary gear set serves multiple functions: it can provide direct connection between input and output, act as a reduction gear, and enable different shafts to be connected to different components. The same planetary gear structure is used across multiple operating modes, reducing the need for separate mechanisms for each function.
Solution Approach 2:
The first and second transmission shafts act as intermediary components that can be selectively connected to different elements (input shaft, planetary gear, output shaft) through shifting elements. These intermediary shafts simplify the overall structure by providing a common connection point that reduces the number of direct connections needed between major components.
3Weight of stationary object
If a compact transmission design is used to reduce space and weight, then the transmission occupies less space, but the ability to provide multiple transmission ratios may be limited
Solution Approach 1:
The planetary gear set is nested within the transmission housing, with the sun gear, planet gears, and ring gear arranged in a compact concentric configuration. The multiple transmission shafts are arranged parallel to each other in a space-efficient manner, allowing the transmission to achieve multiple ratios without requiring a large footprint or excessive weight.
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
The solution reduces mechanical complexity and weight while enabling efficient operation with multiple transmission ratios and flexible drive unit interactions, allowing for smooth gear changes and enhanced vehicle performance, including stationary charging and emission-free operation.
Implementation Method 1
at least one planetary gear, wherein the input shaft can be coupled by means of the first shifting element can be coupled to a first gear shaft and the first gear shaft can be coupled to the ring gear of the planetary gear
Implementation Method 2
The first shifting element can connect or disconnect the input shaft to a first transmission shaft
Data Source
Figure 1
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AI summary
The invention relates to a transmission (100) for a hybrid drive arrangement which can be coupled to two drive assemblies (7, 8), comprising an input shaft (10), and an output shaft (11), at least one first, second, third, fourth, fifth and sixth shifting element (SE1, SE2, SE3, SE4, SE5, SE6), and at least one planetary gear (5). The input shaft (10) can be coupled to a first transmission shaft (16) by means of the first shifting element (SE1), the first transmission shaft (16) can be coupled to the ring gear of the first planetary gear (5) by means of the second shifting element (SE2), the first transmission shaft (16) can be coupled to a second transmission shaft (17) by means of the third shifting element (SE3), the first transmission shaft (16) can be coupled to the fourth transmission shaft (SE4) by means of a third transmission shaft (18), the output shaft (11) can be coupled to the third transmission shaft (18) by means of the fifth shifting element (SE5) and the output shaft (11) can be coupled to the planet carrier of the planetary gear (5). The second transmission shaft (17) can be coupled to the sun gear of the planetary gear (5) by means of the sixth shifting element (SE6).