Radial Electric Machine in Double Clutch Transmission
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Solution Overview
Problem
Existing hybrid drive systems for motor vehicles require significant axial space due to the arrangement of electric motors and clutches, limiting their efficiency and functionality, particularly in starting the internal combustion engine from a stationary state without moving the drive axle.
Innovation Solution
A drive system with a double clutch transmission and a gear drive mounted rotatably on the output shaft, allowing the electric machine to be connected to a fixed gear of one component transmission, enabling activation of the electric motor at rest and reducing axial space requirements, thus enabling efficient energy recovery and starting without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric motor is arranged axially with respect to the output shaft and connected via a clutch, then the electric motor can be integrated into the hybrid drive system, but a large amount of axial space is required
Solution Approach 1:
The patent transitions from axial arrangement to radial arrangement of the electric motor around the output shaft. This dimensional change allows the electric motor to be positioned in the circumferential direction rather than along the axial direction, significantly reducing the axial space requirement while maintaining functional integration in the hybrid drive system
2Power
If the clutch assigned to the electric motor closes and connects the electric motor directly to the drive axle via the output shaft, then power transmission is enabled, but the drive axle rotates as soon as the electric motor is activated, preventing activation in the stationary state
Solution Approach 1:
The patent introduces a gear stage as an intermediary between the electric motor and the output shaft. This gear stage acts as a mediator that allows the electric motor to be activated in the stationary state by providing a mechanical advantage and enabling torque multiplication without directly rotating the drive axle, thus solving the starting problem
3Ease of operation
If a gear stage is introduced to enable electric motor activation in stationary state, then activation capability is improved, but the axial space requirement increases
Solution Approach 1:
The patent positions the gear stage radially around the output shaft rather than axially. This radial positioning of the gear stage, combined with the radial arrangement of the electric motor, allows the power transmission path to be established without increasing axial space, thus resolving the contradiction between activation capability and axial space requirement
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 allows for efficient energy recovery and quick acceleration, reduces axial space, and eliminates the need for a separate starter, enhancing the drive system's efficiency and operational flexibility.
Implementation Method 1
An electric machine can be connected operatively via a gear drive (8) arranged rotatably on the output shaft (6) to a fixed gear (21) of one component transmission (4)
Data Source
AI summary
A drive system (1) for a motor vehicle has a double clutch transmission (2), with two component transmissions (3, 4), a double clutch (5) and an output shaft (6). An internal combustion engine (7) optionally can be connected operatively to one of the component transmissions (3, 4) via the double clutch (5) to drive the output shaft (6). A gear drive (8) is arranged rotatably on the output shaft (6). An electric machine (9) can be connected operatively via the gear drive (8) to at least one fixed gear (16, 17, 21) of one of the component transmissions (3, 4) to drive the output shaft (6) and/or to recover kinetic energy from the drive system (1).