Outboard Motor Silencer Nesting in V-Engine Intake

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Solution Overview

Problem

Outboard motors with V-type engines face challenges in securing sufficient space for silencers, leading to reduced noise suppression and increased size due to the need for larger silencers and additional mounting components.

Innovation Solution

The design incorporates a V-type engine with V-shaped air intake ports and a concave space between them, featuring an air intake path and a silencer positioned within this space to attenuate air intake noise, allowing for a larger silencer installation and reduced motor size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a silencer is installed on the V-type engine to suppress air noise, then air noise suppression is improved, but the outboard motor size increases and installation space becomes insufficient

Engineering Contradiction:

Improveair noiseVSAvoidoutboard motor size

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

The silencer is nested within the existing concave space formed by the V-shaped air intake ports and surrounding engine components. This allows the silencer to be accommodated within the existing motor structure without requiring additional external space, effectively nesting the noise suppression component within the available internal volume.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The invention utilizes the concave space in the lateral dimension created by the V-shaped cylinder arrangement. By placing the silencer in this previously unused three-dimensional space between the V-shaped air intake ports, the design adds noise suppression functionality without extending the motor's external dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If a large silencer is installed to significantly suppress air noise, then air noise suppression is improved, but the outboard motor size increases

Engineering Contradiction:

Improveair noiseVSAvoidmotor size

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

Inventive Principle:

Principle #7Nested doll (Nesting)

3Object-affected harmful factors

If mounting components are added to install a silencer, then air noise suppression is improved, but device complexity increases

Engineering Contradiction:

Improveair noiseVSAvoidmounting component complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The silencer is integrated directly with the air intake system structure, merging the noise suppression function with the existing air intake components. This integration eliminates the need for separate mounting brackets, fasteners, and assembly procedures, as the silencer becomes part of the air intake assembly itself.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The concave space formed by the V-shaped air intake ports serves multiple functions: it provides the structural framework for the air intake system and simultaneously serves as the mounting location for the silencer. This multi-functionality reduces the need for dedicated mounting components and simplifies the overall structure.

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 effectively suppresses air noises during intake while minimizing the motor's size, even with high-output engines, by optimizing the silencer's placement and reducing unnecessary components in the concave space.

Implementation Method 1

a silencer configured to attenuate sound at a time of air intake

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Data Source

PatentUS11421633B2Outboard machine

Publication Date: 2022.08.23 HONDA MOTOR CO LTD

AI summary

This outboard machine has: a V-type engine (engine) in which a plurality of cylinders are arranged in a V-shape when viewed in a plan view; and a cover that covers the engine. The engine has a plurality of intake ports that form pairs in a V-shape inside the plurality of cylinders in a plan view and a concave space is formed between the plurality of intake ports. The cover has therein an intake path that guides air to the intake port, and is also provided with, at a position that is adjacent to the intake path and enters the concave space, a silencer that attenuates the sound during intake.