Hybrid Module Rotational Part Heat Dissipation
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Solution Overview
Problem
Existing hybrid modules face efficiency reduction due to excessive operating temperatures exceeding the optimal range of 160°C, leading to decreased electric machine efficiency and increased torque losses.
Innovation Solution
Incorporating a rotational part radially extending beyond the axis of rotation, which acts as a heat dissipation component, allowing heat from the rotor and clutches to be discharged into the environment through convection, effectively using dry clutches with enhanced heat dissipation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If clutches are arranged in the space surrounded by the rotor to achieve compact design, then device complexity is reduced, but temperature increases leading to efficiency reduction
Solution Approach 1:
The rotational part extends further radially from the axis of rotation than the rotor, utilizing the radial dimension to create an extended heat dissipation surface. This radial extension allows heat to be discharged into the environment of the rotational part, effectively adding a thermal management dimension to the compact clutch arrangement.
2Temperature
If the rotational part extends further radially than the rotor, then heat dissipation capability is improved, but device complexity increases
Solution Approach 1:
The rotational part serves multiple functions: it is rotationally fixed to the rotor to rotate with it, acts as a structural component of the clutch assembly, and functions as a heat dissipation element due to its extended radial surface. This multi-functionality reduces the need for separate dedicated cooling components.
3Loss of energy
If dry clutches are used to reduce torque losses, then efficiency is improved, but heat generation increases leading to temperature problems
Solution Approach 1:
The friction heat generated by the dry clutch, which is normally a harmful effect, is converted into a manageable thermal condition by utilizing the rotational part's extended surface area for heat dissipation. The rotational part acts as a heat sink that actively dissipates the friction heat into the surrounding environment, transforming the harmful heat generation into a controlled thermal management solution.
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 design achieves high efficiency and low torque losses by efficiently dissipating heat, particularly in dry clutches, maintaining optimal operating temperatures and improving hybrid module performance.
Implementation Method 1
heat introduced into the rotational part from the rotor and/or the clutch can be discharged into the environment of the rotational part
Data Source
AI summary
A hybrid module for coupling an internal combustion engine in a motor vehicle includes an axis of rotation, an electric machine, a space, and a clutch. The electric machine has a rotor arranged on the axis of rotation. The space is surrounded by the rotor. The clutch is for transmitting a torque from a drive assembly. The clutch is arranged in the space surrounded by the rotor and includes a rotational part fixed to the rotor and arranged on the axis of rotation. The rotational part extends further radially from the axis of rotation than the rotor such that a heat introduced into the rotational part from the rotor or the clutch can be discharged.