Actuating Device Thermal Management via Composite Housing

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Solution Overview

Problem

Actuating devices for machines, such as exhaust gas turbochargers, face challenges in managing high ambient temperatures, which reduce the service life of electrical and electronic components due to poor thermal conductivity of plastic housing parts and heat generation by electric motors.

Innovation Solution

A two-part housing design with a plastic first housing part and a metal or plastic second housing part, where the electronics are thermally connected to a cooling channel in the second housing part, featuring a heat-conducting elevation that protrudes into the first housing part to enhance cooling, and a cooling channel that allows coolant flow for effective heat dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a plastic housing part is used for the actuating device, then manufacturing cost is reduced and ease of manufacture is improved, but thermal conductivity is poor leading to increased thermal load on electronics

Engineering Contradiction:
Improveease of manufactureVSAvoidthermal load on electronics
Core Design Contradiction:
Ease of manufactureVSTemperature

Solution Approach 1:

The housing is designed as a composite structure combining plastic and metal materials. The plastic housing parts provide cost-effective manufacturing and corrosion resistance, while integrated metal inserts or coatings provide high thermal conductivity pathways. This composite approach allows the housing to simultaneously achieve ease of manufacture, low cost, and effective heat dissipation to protect electronics from thermal load.

Inventive Principle:
Principle #40Composite materials

2Temperature

If a metal housing is used for the actuating device, then thermal conductivity is improved for better heat dissipation, but weight increases and manufacturing cost increases

Engineering Contradiction:
Improveheat dissipationVSAvoidweight
Core Design Contradiction:
TemperatureVSWeight of moving object

Solution Approach 1:

Instead of using metal for the entire housing, the invention applies metal thermal management components only in specific locations where heat dissipation is critical. Metal inserts, thermal conductive coatings, or heat sinks are integrated at strategic positions near heat-generating components, while the remainder of the housing uses lightweight plastic material. This local application of metal provides effective heat dissipation without significantly increasing overall weight.

Inventive Principle:
Principle #3Local quality

3Device complexity

If the electric motor is placed in the housing, then integration is improved, but heat generation by the motor increases thermal load on electronics

Engineering Contradiction:
ImproveintegrationVSAvoidthermal load on electronics
Core Design Contradiction:
Device complexityVSTemperature

Solution Approach 1:

The invention introduces thermal management intermediaries between the electric motor and the housing environment. These intermediaries include heat sinks, thermal conductive pathways, cooling channels, or thermal interface materials that facilitate heat transfer from the motor to the surrounding environment. This allows the motor to remain integrated in the housing while effectively managing its heat generation to protect nearby electronics from excessive thermal load.

Inventive Principle:
Principle #24Intermediary (Mediator)

4Temperature

If cooling channels are integrated into the housing, then heat dissipation is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:
Improveheat dissipationVSAvoiddevice complexity
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The housing is segmented into functional zones with cooling channels integrated into specific sections rather than the entire structure. Cooling channels are strategically placed in areas requiring heat dissipation, such as near the electric motor or electronics compartments, while other housing sections maintain simple solid construction. This segmented approach provides effective cooling where needed without significantly increasing overall device complexity or manufacturing difficulty.

Inventive Principle:
Principle #1Segmentation

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 reduces thermal stress on electronics, allowing them to operate reliably at high temperatures by efficiently dissipating heat through the use of a thermally conductive elevation and coolant flow, thereby extending their service life and simplifying manufacturing.

Implementation Method 1

an axial recess is provided at least in the area of the electronics in the first housing part, into which an axially provided, heat-conducting elevation on the second housing part extends at least in the area of the electronics

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a cooling channel through which a coolant can flow, which is fluidically connected to a coolant inlet connection provided on the outside of the housing and to a coolant outlet connection provided on the outside of the housing

Methodology Applied
Scientific EffectConvection cooling: Convection

Data Source

PatentEP3269959B1Actuating device
Publication Date: 2019.09.04 MAHLE INT GMBH
  • EP3269959B1 patent drawingFigure 1
  • EP3269959B1 patent drawingFigure 2
  • EP3269959B1 patent drawingFigure 3

AI summary

The present invention relates to an actuating device (1) for mechanically actuating a component of a machine, comprising a housing (2) having a first housing part (3) made of plastic and a second housing part (4), an electric motor (5) arranged in the second housing part (4), which projects axially into the first housing part (3) at least with its drive shaft (6) for driving an actuator arranged on the outside of the housing (2) for coupling with the component to be actuated, a cooling channel (9) formed in the second housing part (4) through which a coolant (10) flows, which is fluidically connected to a coolant inlet connection (14) and a coolant outlet connection (15) provided on the outside of the housing (2), and electronics (11) arranged in the first housing part (3).an axial recess (12) formed at least in the area of ​​the electronics (11) on the first housing part (3) and an axial heat-conducting protrusion (13) provided on the second housing part (4), which extends axially into the recess (12) at least in the area of ​​the electronics (11).