Outboard Motor Water Outlet Layout for Pump-Free Fine Dust Capture

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Solution Overview

Problem

Existing outboard motors face challenges in increasing the capturing efficiency of fine dust without complicating the structure, increasing size, or raising manufacturing costs by using a pump to enhance water flow through the fine dust capturing device.

Innovation Solution

The outboard motor is designed with a propeller unit, support portion, and a fine dust capturing device where the water outlet is positioned in front of the propeller and inside a circle with the propeller's diameter as the center, facing directions other than the front, creating negative pressure to increase water flow through the filter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a pump is added to increase water flow rate through the capturer, then the flow rate of water passing through the filter increases, but the structure of the fine dust capturing device becomes complicated, the size of the outboard motor increases, and manufacturing cost increases

Engineering Contradiction:

Improveflow rate of water passing through the filterVSAvoidstructure of the fine dust capturing device

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The propeller unit serves dual functions: propelling the vessel and generating water flow through the capturer. The rotation of the propeller creates a suction effect that draws water through the water intake and forces it through the filter, eliminating the need for a separate pump system. This self-service approach increases water flow rate while avoiding additional components that would complicate the structure.

Inventive Principle:

Principle #25Self-service

2Productivity

If a pump is added to increase water flow rate through the capturer, then the amount of fine dust captured per unit sailing time increases, but the size of the outboard motor increases

Engineering Contradiction:

Improveamount of fine dust captured per unit sailing timeVSAvoidsize of the outboard motor

Core Design Contradiction:

ProductivityVSVolume of moving object

Solution Approach 1:

The propeller unit is designed to perform multiple functions simultaneously: it provides propulsion for the vessel and acts as a water pump for the fine dust capturing system. By utilizing the existing propeller's rotational motion to generate water flow through the capturer, the invention eliminates the need for a separate pump, thereby increasing fine dust capture productivity without expanding the outboard motor's size.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If a pump is added to increase water flow rate through the capturer, then the amount of fine dust captured per unit sailing distance increases, but manufacturing cost increases

Engineering Contradiction:

Improveamount of fine dust captured per unit sailing distanceVSAvoidmanufacturing cost of the outboard motor

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The system utilizes the propeller's inherent rotational energy to drive water through the capturer and filter, eliminating the need for an additional pump component. This self-service mechanism increases fine dust capture efficiency while reducing manufacturing costs by avoiding the expenses associated with designing, sourcing, and installing a separate pump system.

Inventive Principle:

Principle #25Self-service

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 the capturing efficiency of fine dust per unit sailing time and distance without adding a pump, preventing structural complexity and cost increases.

Implementation Method 1

the water outlet is positioned in front of the propeller and inside a circle having the same diameter as a diameter of the propeller, with a rotation center of the propeller as a center, when the outboard motor is viewed from a rear side, and faces in a direction other than a front side of the outboard motor

Methodology Applied

Scientific EffectNegative pressure: Pressure Drop

Data Source

PatentEP4524019B1Outboard motor

Publication Date: 2026.03.04 SUZUKI MOTOR CORP

Figure 1
Figure 2
Figure 3A~3B

AI summary

An outboard motor (1) includes a fine dust capturing device (21), the fine dust capturing device (21) includes a water intake (26) for taking in water around the outboard motor (1), a passage (27) through which the water taken in from the water intake (26) flows, a filter for capturing fine dust contained in the water by allowing the water flowing through the passage (27) to pass therethrough, and a water outlet (29) for discharging the water after passing through the filter to a periphery of the outboard motor (1). The water outlet (29) is positioned in front of the propeller (5) and inside a circle (C) having the same diameter as a diameter of the propeller (5), with a rotation center (A) of the propeller (5) as a center, when the outboard motor (1) is viewed from a rear side, and faces in a direction other than a front side of the outboard motor (1).