Piston Cooling Filter With Side Holes To Prevent Clogging

Solution Overview

Problem

Existing piston cooling devices for internal combustion engines face challenges in extending the life of filters due to their small size and limited filter area, making it difficult to maintain effective filtration and prevent clogging by foreign particles.

Innovation Solution

A piston cooling device design featuring a cylindrical main body with a large-diameter portion in contact with the oil passage and a small-diameter portion holding a bottomed cylindrical filter with filter holes on both the bottom and side surfaces, where the filter bottom surface protrudes upstream, and a recessed portion on the filter bottom surface to increase filter area and trap foreign matters effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a filter is provided in a small piston cooling device, then foreign matters can be filtered from the oil, but the filter area is limited and the filter life is short

Engineering Contradiction:

Improvefiltration effectivenessVSAvoidfilter area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The filter surface is extended from a single plane to multiple dimensions by forming filter holes not only on the bottom surface but also on the side surface of the cylindrical filter. This multi-dimensional hole distribution increases the total filter area without increasing the overall filter volume, allowing more foreign matters to be trapped simultaneously and extending filter life in the limited space of the piston cooling device.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a filter is provided in a small piston cooling device, then foreign matters can be filtered from the oil, but the maintenance cycle is short

Engineering Contradiction:

Improvefiltration effectivenessVSAvoidfilter life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The filter surface is extended from a single plane to multiple dimensions by forming filter holes not only on the bottom surface but also on the side surface of the cylindrical filter. This multi-dimensional hole distribution increases the total filter area without increasing the overall filter volume, allowing more foreign matters to be trapped simultaneously and extending filter life in the limited space of the piston cooling device.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If the filter bottom surface is positioned at the upstream side, then foreign matters can be trapped effectively, but the oil passage may be blocked

Engineering Contradiction:

Improvefiltration effectivenessVSAvoidoil passage clogging

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The filter surface is extended from a single plane to multiple dimensions by forming filter holes not only on the bottom surface but also on the side surface of the cylindrical filter. This multi-dimensional hole distribution increases the total filter area without increasing the overall filter volume, allowing more foreign matters to be trapped simultaneously and extending filter life in the limited space of the piston cooling device.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Different regions of the filter are given different functions: the bottom surface primarily traps larger foreign matters, while the side surface with its filter holes provides additional filtration paths and prevents clogging by distributing the filtration load across multiple locations. This local differentiation of filtration functions optimizes both trapping effectiveness and passage reliability.

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 design ensures prolonged filter functionality by maintaining oil passage through filter side holes, trapping foreign particles in the filter's recessed area and between the small-diameter cylindrical portion and the oil passage, preventing clogging and extending the filter's maintenance cycle.

Implementation Method 1

filter holes are formed in the filter bottom surface and the filter side surface... the filter which is provided at an upstream side of the nozzle pipe portion in an oil flow path to filter foreign matters in the oil

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS10612449B2Piston cooling device

Publication Date: 2020.04.07 HONDA MOTOR CO LTD

AI summary

A piston cooling device includes a main body which includes a communication path communicating with an oil passage provided in the internal combustion engine, a nozzle pipe portion which includes an oil injection port for injecting an oil passing through the communication path, toward the piston, and a filter which is provided at an upstream side of the nozzle pipe portion in an oil flow path to filter the oil. The main body includes a cylindrical portion inserted into the oil passage. The filter has a bottomed cylindrical shape in which a filter side surface stands from a filter bottom surface, and is held inside the cylindrical portion. Filter holes are formed in the filter bottom surface and the filter side surface. The filter is disposed such that the filter bottom surface protrudes further upstream side in the oil flow path than a tip end of the cylindrical portion.