Internal Combustion Engine Ring Member Vibration Stabilization

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Solution Overview

Problem

In internal combustion engines, the ring member provided to a stepped portion on the cylinder may move due to vibration and come into contact with the piston, potentially causing damage to either component.

Innovation Solution

A cylindrical ring member with a protrusion portion that bites into the lower surface of a gasket is provided to the stepped portion, preventing movement due to vibration and ensuring the ring member does not contact the piston.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the ring member is not fixed to the stepped portion, then the installation and removal of the ring member is simple, but the ring member may move due to vibration and come into contact with the piston causing damage

Engineering Contradiction:

Improveease of installationVSAvoidstability of ring member

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The retention mechanism is segmented into multiple protrusion portions distributed around the ring member's inner circumference. Each protrusion portion engages with the gasket independently, providing distributed stabilization rather than a single fixed point, thus maintaining ease of installation while improving reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gasket serves as an intermediary element between the ring member and the cylinder head. The protrusion portions of the ring member engage with the gasket, which in turn is clamped between the cylinder head and cylinder, indirectly securing the ring member without requiring direct fixation to the stepped portion.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the ring member is loose on the stepped portion, then the ring member can be easily installed, but the space between the ring member and piston increases reducing combustion efficiency

Engineering Contradiction:

Improveease of installationVSAvoidcombustion efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The protrusion portions are pre-formed on the ring member during manufacturing, so that upon installation and compression of the gasket, the ring member is automatically positioned at the correct height relative to the piston. This preliminary positioning action ensures optimal combustion chamber volume without requiring complex adjustment mechanisms.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the ring member moves during operation, then the structure is simple, but damage to the ring member or piston occurs

Engineering Contradiction:

Improvestructural simplicityVSAvoidprevention of contact damage

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The ring member's own protrusion portions serve the dual function of both identification (positioning) and retention (preventing movement). The structure is self-sufficient, using features inherent to the ring member itself rather than requiring separate retention mechanisms, thus maintaining simplicity while preventing contact damage.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12000354B2Internal combustion engine

Publication Date: 2024.06.04 ISUZU MOTORS LTD

AI summary

An internal combustion engine includes: a cylinder in which a piston reciprocates; a cylinder head positioned above the cylinder; a gasket disposed between the cylinder and the cylinder head; a stepped portion that is formed at an upper end portion of an inner peripheral surface of the cylinder and positioned below the gasket; a ring member having a cylindrical shape provided to the stepped portion; and a protrusion portion that is formed in a manner to protrude from the ring member and bites into a lower surface of the gasket.