Water Jacket Spacer Pocket Rectification for Cylinder Cooling

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Solution Overview

Problem

Existing water jacket spacers fail to stably prevent excessive cooling of the cylinder bore wall around the cooling water introduction port, leading to increased engine oil viscosity and piston ring sliding resistance, due to vibration and deterioration over time, and insufficient inhibition of cooling water flow.

Innovation Solution

A water jacket spacer with a rectification means in the form of a pocket on the side of the cooling water introduction port, which redirects and diffuses cooling water flow upward, reducing the amount of cooling water reaching the lower edge of the cylinder bore wall and preventing excessive cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a seal structure or firmly attached structure is used to prevent excessive cooling, then the prevention effect is improved, but the structure is not stably kept due to vibration and deterioration over time

Engineering Contradiction:

Improveprevention effect of excessive coolingVSAvoidstability of spacer structure

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The water jacket spacer is divided into multiple functional regions: a first water jacket spacer portion facing the cooling water introduction port, and a second water jacket spacer portion facing away from it. This segmentation allows different portions to perform different functions - the first portion prevents excessive cooling while the second portion maintains structural stability and positioning.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the thermal conductivity of the cylinder bore wall is reduced to prevent excessive cooling, then the prevention effect is improved, but the thermal conductivity of the cylinder block must be reduced which is not practical

Engineering Contradiction:

Improveprevention effect of excessive coolingVSAvoidpracticality of modification

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The water jacket spacer acts as an intermediary component between the cooling water and the cylinder bore wall. Instead of modifying the cylinder block itself, the spacer provides a controllable thermal barrier that prevents excessive cooling at specific locations while allowing normal cooling elsewhere.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If an extending portion with a bending portion is provided to inhibit cooling water flow, then the prevention effect is improved, but the extending portion and peak may not sufficiently fulfill inhibition function

Engineering Contradiction:

Improveprevention effect of excessive coolingVSAvoidcomplexity of spacer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The spacer provides localized thermal management by positioning the first water jacket spacer portion specifically at the region prone to excessive cooling (near the cooling water introduction port). This local intervention prevents excessive cooling without requiring complex structures throughout the entire spacer.

Inventive Principle:

Principle #3Local quality

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

The solution effectively inhibits excessive cooling of the cylinder bore wall, maintaining energy efficiency by stabilizing the spacer's position and reducing engine oil viscosity and piston ring sliding resistance.

Implementation Method 1

cooling water inserted in the water jacket from the cooling water introduction port hits a face on the cooling water introduction port side of the spacer body, then part of cooling water enters and flows out of the rectification means in the form of a pocket, and circulates so as to diffuse along the spacer body upward in the depth direction of the water jacket

Methodology Applied

Scientific EffectFluid flow diffusion: Diffusion

Implementation Method 2

cooling water inserted in the water jacket from the cooling water introduction port hits a face on the cooling water introduction port side of the spacer body

Methodology Applied

Scientific EffectImpact force: Impact Force

Data Source

PatentUS10378419B2Water jacket spacer

Publication Date: 2019.08.13 UCHIYAMA MFG

AI summary

A water jacket spacer adjusting a flow amount of cooling water in a water jacket, the water jacket spacer being inserted in the water jacket of a cylinder block, the water jacket spacer has a spacer body and a rectification means inhibiting flow of cooling water to an inner wall on a cylinder bore side of the water jacket, the rectification means having a form of a pocket and being provided on a face of the spacer body, the face being on a side of a cooling water introduction port of the water jacket, the rectification means being provided lower than the cooling water introduction port in a depth direction.