Tailpipe Cover Insert for Heat Protection

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Solution Overview

Problem

Existing tailpipe trim arrangements for motor vehicles fail to effectively protect the rear paneling from excessive heating caused by exhaust gases, leading to potential deformation or damage.

Innovation Solution

Incorporating a high-temperature-resistant plastic insert part between the tailpipe trim and the rear paneling, with an annular gap for thermal expansion compensation and a ceramic connection for enhanced thermal insulation, along with a tailpipe trim made of metal or ceramic materials to conceal the visible joint and allow for movement due to engine vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a conventional tailpipe trim arrangement is used without thermal insulation, then the structure remains simple and manufacturing cost is low, but the rear paneling part is subjected to excessive heating and may deform or damage

Engineering Contradiction:

Improveheat protection of rear panelingVSAvoidstructure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

An insert part made of high-temperature-resistant plastic is introduced as an intermediary component between the tailpipe trim and the rear paneling part. This insert part acts as a thermal barrier that protects the rear paneling from excessive heat while maintaining the overall structural integrity and simplicity of the assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The tailpipe trim arrangement uses composite material construction, combining metal or ceramic tailpipe trim with high-temperature-resistant plastic insert parts. This composite approach provides both thermal protection and structural functionality, resolving the contradiction between heat protection and device complexity.

Inventive Principle:

Principle #40Composite materials

2Shape

If the tailpipe trim is made to fit tightly around the tailpipe, then the visual appearance is improved, but the thermal expansion of the exhaust system is restricted causing potential damage

Engineering Contradiction:

Improvevisual appearanceVSAvoidthermal expansion compensation

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The insert part is designed with specific local geometric features that provide clearance and flexibility in critical areas where thermal expansion occurs, while maintaining a tight and aesthetically pleasing fit in visible areas. This localized differentiation resolves the contradiction between appearance and thermal expansion compensation.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If the tailpipe position is fixed relative to the tailpipe trim, then manufacturing precision is improved, but tolerance compensation for assembly variations is lost

Engineering Contradiction:

Improvetailpipe position accuracyVSAvoidtolerance compensation

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The insert part incorporates dynamic adjustment capabilities through its geometric design, allowing it to adapt to variations in tailpipe position and orientation. This dynamic adaptability compensates for assembly tolerances while maintaining precise visual alignment, resolving the contradiction between manufacturing precision and adaptability.

Inventive Principle:

Principle #15Dynamics

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 solution effectively shields the rear paneling from heat damage, reduces the risk of exhaust system damage, and provides reliable thermal and mechanical protection while maintaining a visually concealed joint and allowing for tolerance compensation.

Implementation Method 1

the at least one insert part consisting at least partially of a high-temperature-resistant plastic

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

An annular gap extending in the longitudinal direction of the vehicle is provided between the outlet-side circumference of the tailpipe and the inner circumference of the tailpipe trim. This enables, among other things, compensation for the thermal linear expansion of the exhaust system.

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 3

one or more ceramic elements are provided to connect the tailpipe trim to the at least one insert part

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentEP2148791B1Tailpipe cover arrangement and rear end trim

Publication Date: 2013.07.17 DR ING H C F PORSCHE AG

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AI summary

The invention relates to a tailpipe cover arrangement for an exhaust tailpipe of a motor vehicle having a tailpipe cover (1) and having a rear end trim part (3), wherein at least one inset part (2) is located between the tailpipe cover (1) and the rear end trim part (3), said insert part being made at least partially of a high temperature-resistant plastic, preferably a thermoplastic structural material based on a semi-crystalline partially aromatic copolyamide. The rear end trim part (3) is thus effectively protected from excessive heat and particularly from heat-induced deformation or damage. The effectiveness of the heat protection can be further increased if the at least one inset part (2) is designed to fully shield the tailpipe cover (1) and the rear end trim part (3) from each other.