Cooling system for ship propulsion systems

The cooling device for marine propulsion systems addresses the issue of reduced filtration capacity by optimizing passage arrangements to prevent backflow, ensuring efficient particle collection and maintaining filtration efficiency without a relief valve.

JP7868717B2Active Publication Date: 2026-06-02SUZUKI MOTOR CORP
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Patents
Current Assignee / Owner
SUZUKI MOTOR CORP
Filing Date
2025-03-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

The removal of fine particles in a cooling device for marine propulsion systems is compromised when the relief valve is removed, leading to reduced collection efficiency due to backflow of cooling water and exhaust gas, which stirs up accumulated particles and reduces the filtration capacity.

Method used

A cooling device design with a drainage passage, collection passage, and bypass passage arrangement that minimizes flow direction differences at branching and confluence points, ensuring that cooling water flows primarily into the collection passage when the filter is unclogged and redirects exhaust gas flow to prevent backflow, maintaining efficient particle collection.

Benefits of technology

This design ensures effective collection of fine particles by preventing backflow of cooling water and exhaust gas, thereby maintaining the filtration capacity without the need for a valve to manage bypass flow, enhancing the device's efficiency and reliability.

✦ Generated by Eureka AI based on patent content.

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Abstract

To provide a ship propulsion engine cooling device capable of sufficiently ensuring micro object collection ability even without using a valve to open / close a bypass passage.SOLUTION: In an outboard engine cooling device, an upstream part 27A of a drain passage, a downstream part 27B of the drain passage, a collection passage 32, and a bypass passage 34 are arranged so that the difference between the flow direction of a cooling water flowing into a branch part 35 from the upstream part 27A and the flow direction of the cooling water flowing into the collection passage 32 from the branch part 35 becomes smaller than the difference between the flow direction of the cooling water flowing into the branch part 35 and the flow direction of the cooling water flowing into the bypass passage 34. The upstream part of the drain passage, the downstream part of the drain passage, the collection passage, and the bypass passage are arranged so that the difference between the flow direction of the cooling water flowing into a confluent part 36 from the bypass passage 34 and the flow direction of the cooling water flowing into the downstream part 27B from the confluent part 36 becomes smaller than the difference between the flow direction of the cooling water flowing into the confluent part 36 from the collection passage 32 and the flow direction of the cooling water flowing into the downstream 27B from the confluent part 36.SELECTED DRAWING: Figure 5
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