Roller Filter Assembly for Fuel Injectors
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Solution Overview
Problem
Contaminants and impurities in hydraulic fluid used by Hydraulically actuated Electronically controlled Unit Injectors (HEUIs) can erode internal components, affect tolerances, and lead to imprecise fuel injection, reducing injector lifespan and performance.
Innovation Solution
A filter assembly comprising first and second rollers, arranged in specific planes to create filtration zones, is positioned within the fuel injector's channel to filter hydraulic fluid, preventing contaminants from passing through and ensuring clean fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fuel filter with a flat filter element is used, then the filter structure is simple, but the filtration effectiveness is insufficient and contaminants can still pass through
Solution Approach 1:
The filter element is divided into multiple rolling sections, each containing rollers that create multiple filtration zones. This segmentation allows the hydraulic fluid to pass through multiple filtering stages, significantly improving filtration effectiveness while maintaining a manageable structure through the use of modular rolling sections.
Solution Approach 2:
The filter transitions from a traditional flat 2D filter element to a 3D rolling structure with rollers arranged in multiple planes. This dimensional change creates multiple filtration zones that the hydraulic fluid must pass through, enhancing filtration capability without proportionally increasing the filter's footprint.
2Reliability
If multiple filtration zones are created using rollers, then the filtration effectiveness is improved, but the manufacturing complexity increases
Solution Approach 1:
The filter is divided into multiple independent rolling sections, each with its own rollers and filtration zones. This segmentation allows each section to be manufactured separately using standardized processes, reducing overall manufacturing complexity despite the increased number of filtration zones.
Solution Approach 2:
The rolling sections are designed to be nested or stacked within each other, with each section containing rollers that can be independently manufactured and then assembled. This nesting approach simplifies manufacturing by allowing modular assembly rather than requiring the entire multi-zone structure to be manufactured as a single complex piece.
Data Source
AI summary
A filter assembly for filtering hydraulic fluid in a hydraulically actuated fuel injector is disclosed. The filter assembly includes a plurality of first rollers and a plurality of second rollers. The first rollers are parallelly disposed one after the other, and define first axes disposed in a first plane. The second rollers are parallelly disposed one after the other, and define second axes disposed in a second plane. The first plane is parallel to the second plane. Further, each second roller is disposed between a consecutively arranged pair of first rollers to define one or more filtration zones for filtering the hydraulic fluid.