Ribbed Cylinder Head Combustion Pressure Weight Trade-off

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Solution Overview

Problem

Conventional cylinder heads for internal combustion engines face challenges in achieving increased combustion pressure while minimizing weight, which affects fuel efficiency and emissions.

Innovation Solution

The design incorporates a cylinder head configuration with a bottom deck, component bore, bolt bosses, valve bosses, and ribs, where the ribs extend longitudinally to connect bolt and valve bosses, optimizing material distribution to enhance structural efficiency and peak combustion pressure capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional cylinder head design is used, then weight is reduced, but combustion pressure capability decreases

Engineering Contradiction:

Improvecombustion pressure capabilityVSAvoidcylinder head weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The cylinder head is segmented into multiple functional regions with ribs creating distinct structural zones. The ribs divide the cylinder head into separate compartments that can independently manage stress distribution, allowing thin-walled construction while maintaining overall strength for high combustion pressure applications.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cylinder head have different wall thicknesses and structural densities. The ribs create areas of localized reinforcement where stress concentrations occur, while other regions maintain thinner walls to reduce weight. This non-uniform structural quality optimizes the strength-to-weight ratio for combustion pressure capability.

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If material is removed to reduce weight, then fuel efficiency improves, but structural efficiency decreases

Engineering Contradiction:

Improvecylinder head weightVSAvoidstructural efficiency

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The ribbed structure segments the cylinder head into multiple load-bearing zones, allowing material removal in non-critical areas while maintaining structural integrity through the rib framework. This segmentation enables weight reduction without proportional loss in structural efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cylinder head employs a composite structural approach combining thin walls with reinforced rib sections. This creates a composite-like structure where different regions serve different functional requirements, achieving high structural efficiency with reduced overall material content for improved fuel efficiency.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS9470177B2Cylinder head for internal combustion engine

Publication Date: 2016.10.18 CUMMINS INTELLECTUAL PROPERTY INC

AI summary

Rib configurations for increasing the structural efficiency of a cylinder head, which relates to a peak combustion pressure capability of the cylinder head. In addition to increasing peak combustion pressure, the rib configurations may also improve sealing of the cylinder head and may improve the durability of an associated cylinder head gasket.