Damper Pulley Air Flow Design for Engine Heat Dissipation

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Solution Overview

Problem

In engine compartments with space constraints, the close proximity of pulley and damper assemblies limits air movement, leading to overheating due to inadequate heat dissipation.

Innovation Solution

The design incorporates a cylindrical pulley with pulley air holes and slots, and cylindrical dampers with air holes and attachment holes, aligned to facilitate air flow and heat dissipation by allowing air to circulate between the pulley and dampers, with fasteners securing them along a central axis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the pulley and damper are placed close together due to space constraints, then the engine compartment space utilization is improved, but the air flow around the damper is restricted leading to overheating

Engineering Contradiction:

Improveengine compartment space utilizationVSAvoiddamper temperature

Core Design Contradiction:

Volume of moving objectVSTemperature

Solution Approach 1:

The damper is segmented with multiple air holes distributed across its structure, dividing the heat dissipation function into multiple discrete flow paths. This segmentation allows air to penetrate through the damper body at multiple locations, increasing overall heat dissipation efficiency while maintaining a compact form factor that fits within constrained engine compartments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Air holes are strategically positioned at specific locations on the damper where heat generation is most intense. The local quality of heat dissipation is enhanced by concentrating air flow channels at critical thermal zones, allowing effective cooling without requiring increased overall damper size or additional engine compartment space.

Inventive Principle:

Principle #3Local quality

2Temperature

If the damper structure is made more complex with additional cooling features, then the heat dissipation capability is improved, but the device complexity increases

Engineering Contradiction:

Improveheat dissipation capabilityVSAvoiddamper structure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The cooling function is merged directly into the damper body structure by integrating air holes and flow channels within the existing damper geometry. This combination eliminates the need for separate cooling systems or attachments, achieving enhanced heat dissipation while maintaining structural simplicity and avoiding additional components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The damper structure serves multiple functions simultaneously: it provides vibration damping through its elastomeric material while also functioning as a heat dissipation device through its integrated air hole configuration. This multi-functionality allows the same structural elements to address both mechanical and thermal requirements without increasing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances air flow and heat dissipation, effectively reducing the risk of overheating in constrained engine compartments by promoting airflow through strategically positioned air holes and slots.

Implementation Method 1

Dampers, due to their function, produce great amounts of heat that needs to be quickly dissipated from their surfaces (e.g., via air movement), in order to keep them and the engine operational.

Methodology Applied

Scientific EffectHeat dissipation: Convection

Implementation Method 2

Methodology Applied

Scientific EffectAir flow: Convection

Data Source

PatentUS11668387B1Damper pulley design

Publication Date: 2023.06.06 CATERPILLAR INC

AI summary

A damper and pulley assembly for an internal combustion engine is disclosed. The damper and pulley assembly, including a pulley closely fitted between two dampers, is configured to have increased air movement for heat dissipation while conforming to low spacing requirements of an engine compartment. The pulley can have multiple slots along its two side surfaces and openings located in the slots. The slots and openings of the pulley are aligned with openings of the two dampers, and facilitate air movement through the pulley and around the dampers.