Hybrid Drive Transmission Layout for Compact Torque Distribution
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Solution Overview
Problem
Existing hybrid drive systems for motor vehicles are not compact enough and do not provide high performance simultaneously.
Innovation Solution
A hybrid drive system incorporating an internal combustion engine and an electric machine, with a design featuring two planetary gear sets, an axial transmission, and multiple switch elements to distribute torque efficiently across vehicle wheels, allowing for compactness and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hybrid drive system with planetary gear sets and multiple transmissions is implemented, then torque distribution capability and performance are improved, but system compactness deteriorates
Solution Approach 1:
The patent combines the first and second planetary gear sets into a single integrated transmission unit where the first annular gear and second sun gear are coaxially arranged. The first differential gear set is integrated with the second planetary gear set, sharing common structural elements. This merging of multiple transmission functions into a unified structure achieves compact packaging while maintaining multi-gear capability and torque distribution functionality.
Solution Approach 2:
The transmission system employs a nested arrangement where the first planetary gear set is positioned within the same housing as the second planetary gear set, with coaxial alignment allowing one gear set to be effectively nested within the radial space of the other. The differential gear set is nested within the transmission structure, sharing space with the planetary gear sets. This nesting approach maximizes space utilization and achieves compactness.
2Productivity
If multiple planetary gear sets and transmissions are used to achieve high performance, then device complexity increases
Solution Approach 1:
The first and second planetary gear sets serve multiple functions: they provide different gear ratios for multi-gear operation, enable torque splitting between wheels through the differential, and allow for both engine and electric motor power transmission. The coaxial arrangement of gear elements allows the same structural components to fulfill multiple transmission and differential functions, reducing overall system complexity despite the advanced capabilities.
Data Source
AI summary
A hybrid drive system for a motor vehicle includes an internal combustion engine having a drive shaft via which first drive torques can be provided by the internal combustion engine and an electric machine having a rotor via which second drive torques can be provided by the electric machine. An axial transmission has an axial transmission input gear via which the axial transmission can be driven. The system also includes a transmission having a first partial transmission and a second partial transmission. The first partial transmission has a first planetary gear set having a first element, a second element, and a third element. A second planetary gear set has a fourth element, a fifth element, and a sixth element that is permanently connected to the second element in a manner fixed against rotation. The second partial transmission comprises a first spur gear stage and a driven shaft.