Fuel Injector Filter Sleeve Axial Separation

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Solution Overview

Problem

Conventional fuel injectors face issues with flow losses and risk of filter damage due to manufacturing tolerances, making it challenging to ensure precise injection quantities and maintain filter integrity.

Innovation Solution

The design features a filter with a sleeve and filter body arrangement, where the filter body is exclusively within the securing section of the sleeve, allowing for axial separation of holding and securing sections, which reduces the impact of manufacturing tolerances and enables a robust, low-force press connection, thus protecting the filter from damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a filter is integrated directly in the injector in the inflow region, then the components are protected from damage caused by particles in the fluid, but flow losses occur and manufacturing tolerances can cause excessive forces damaging the filter

Engineering Contradiction:

Improvefilter protection from particle damageVSAvoidflow losses

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The filter assembly is segmented into distinct functional zones: a securing section for particle protection and a holding section for flow management. This segmentation allows each section to optimize its specific function, reducing overall flow losses while maintaining protective capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the filter assembly are designed with locally optimized properties. The securing section has structural features for particle filtration, while the holding section has geometry optimized for minimal flow resistance. This local quality differentiation resolves the contradiction between protection and flow efficiency.

Inventive Principle:

Principle #3Local quality

2Reliability

If a filter is integrated directly in the injector, then components are protected from particle damage, but manufacturing tolerances lead to excessive forces that can damage the filter

Engineering Contradiction:

Improvecomponent protection from particlesVSAvoidfilter resistance to manufacturing forces

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The filter assembly separates the load-bearing securing function from the filter media. The securing section absorbs manufacturing forces and tolerances, while the holding section protects the filter body from excessive forces during assembly and operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The holding section is designed beforehand to cushion and absorb excessive forces that may occur during manufacturing or operation. This preemptive design protects the filter body from damage due to manufacturing tolerances and assembly variations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the filter body extends into the holding section, then the filter is secured in the tubular section, but manufacturing tolerances affect the press-in force and can cause damage

Engineering Contradiction:

Improvefilter securing in tubular sectionVSAvoidpress-in force consistency

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The filter body is segmented into a securing section that interfaces with the tubular section and a holding section that is axially separated. This segmentation isolates the press-fit interface from the filter media, making the securing function independent of filter body dimensions and reducing sensitivity to manufacturing tolerances.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter body is extracted from the holding section region, creating an axial separation. This extraction allows the holding section to be optimized purely for minimal-flow resistance geometry, while the securing section handles the mechanical interface, decoupling the two functions and reducing tolerance sensitivity.

Inventive Principle:

Principle #2Taking out (Extraction)

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 design simplifies assembly, reduces the risk of filter damage, and ensures a consistent press connection independent of manufacturing tolerances, leading to improved robustness and precise fluid injection.

Implementation Method 1

a filter body (11), in which preferably a filter insert (17) which brings about the filtering of the fluid is integrated

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS20240125292A1Injector with integrated filter

Publication Date: 2024.04.18 ROBERT BOSCH GMBH

AI summary

An injector for injecting a fluid. In injector includes a filter for filtering the fluid to be injected. The filter is arranged in a tubular section of the injector. The filter has a sleeve and a filter body. The sleeve holds the filter body in the tubular section. The sleeve has a securing section and a holding section. The securing section is connected to the filter body. The holding section holds the sleeve in the tubular section of the injector. The filter body or parts of the filter body are arranged exclusively within the securing section.