Coaxial P2 Hybrid Transmission Layout for Compact Motor Integration
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Solution Overview
Problem
Current P2 hybrid powertrains face packaging concerns due to the addition of an electric motor-generator unit, requiring increased space within the vehicle, as the unit is often positioned externally or increases the transmission size when housed within.
Innovation Solution
The electric motor-generator unit is positioned coaxially within the transmission, supported by a pump support, with a torque converter and planetary gearset, allowing for compact integration and minimizing additional space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric motor-generator unit is positioned externally or housed within the transmission, then the hybrid powertrain achieves its intended purpose, but the lateral and axial space needed for the powertrain increases
Solution Approach 1:
The electric motor-generator unit is merged with the transmission by positioning it coaxially within the transmission housing, sharing the same space and eliminating the need for separate mounting space. The motor-generator unit integrates with existing transmission components such as the pump support and torque converter, combining multiple functions into a single compact assembly.
Solution Approach 2:
The electric motor-generator unit is nested within the transmission housing, with the motor positioned inside the transmission case and the generator coupled to the same input shaft. This nested arrangement allows the motor-generator to occupy space already allocated for transmission components, rather than requiring additional external space.
2Device complexity
If the MGU is placed coaxially to the input of the transmission, then power transfer is simplified, but the overall size of the transmission must be increased to accommodate the MGU
Solution Approach 1:
The transmission input shaft serves multiple functions: it receives power from the engine through the torque converter and simultaneously receives power from the electric motor-generator unit. This multi-functional design eliminates the need for separate power input paths, allowing the transmission to handle both power sources without increasing its overall size.
Solution Approach 2:
The motor-generator unit is positioned in the axial dimension within the transmission housing, utilizing the existing axial space rather than requiring additional lateral or longitudinal expansion. This dimensional arrangement allows the MGU to be accommodated within the transmission's existing envelope.
3Area of stationary object
If an MGU is housed within the transmission, then packaging space is reduced, but the transmission size must be increased to accommodate the MGU
Solution Approach 1:
The motor-generator unit is positioned in a specific local area within the transmission housing, utilizing unused or underutilized space near the input shaft and torque converter. This localized placement allows the MGU to be accommodated without requiring a uniform increase in transmission size throughout the entire housing.
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
This configuration enables the addition of an electric motor-generator unit without increasing the transmission size, addressing packaging concerns and allowing for efficient power transfer while maintaining existing transmission design parameters.
Implementation Method 1
a torque converter positioned between and interconnecting the engine to the input shaft of the transmission
Implementation Method 2
the torque converter having a one-way clutch adapted to drivingly connect the torque converter to the input shaft of the transmission
Implementation Method 3
an electric motor-generator unit adapted to provide power to the input shaft of the transmission
Data Source
AI summary
A hybrid powertrain for an automobile includes a transmission adapted to provide power to wheels of the automobile, an engine adapted to provide power to an input shaft of the transmission, and an electric motor-generator unit adapted to provide power to the input shaft of the transmission, wherein the electric motor-generator is positioned within the transmission, coaxial with the transmission input shaft, the electric motor-generator being supported by and enclosed within a pump support of the transmission.