High-Pressure Fuel Pump Through-Bore Valve Flushing
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Solution Overview
Problem
High-pressure fuel pumps in fuel injection systems suffer from blind bore accumulation of dirt and debris until the pressure-limiting valve is activated, which can lead to contamination of the pressure chamber when it is finally engaged, causing potential damage to components.
Innovation Solution
A high-pressure fuel pump design where the pressure-limiting valve is arranged in a through-bore connected to the low-pressure inflow, ensuring constant flushing and preventing dirt accumulation, with a smaller connecting region for the pressure-limiting valve and an optional connecting aperture for hydraulic connection to the pressure chamber, allowing for laminar discharge and reduced particle accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure-limiting valve is arranged in a blind bore, then the valve can be compactly integrated into the housing, but the blind bore accumulates dirt and debris until the valve is activated
Solution Approach 1:
The harmful blind bore is extracted and replaced by a through-bore that connects to the low-pressure inflow, allowing continuous flushing of the pressure-limiting valve area and preventing dirt accumulation while maintaining compact integration
2Reliability
If the pressure-limiting valve discharges excess fuel into the pressure chamber, then the overpressure is relieved, but accumulated dirt is conveyed into the pressure chamber causing contamination
Solution Approach 1:
The discharge path for excess fuel is extracted from the pressure chamber and redirected to the low-pressure inflow through the through-bore, maintaining overpressure relief functionality while preventing contamination of the pressure chamber
Solution Approach 2:
The low-pressure inflow serves as an intermediary medium to receive and flush away excess fuel and contaminants, preventing direct discharge into the pressure chamber while maintaining the pressure relief function
3Object-affected harmful factors
If a through-bore is used instead of a blind bore, then dirt accumulation is prevented through constant flushing, but the structural simplicity is reduced
Solution Approach 1:
The through-bore serves multiple functions: it provides the pressure relief path for the pressure-limiting valve, acts as a continuous flushing channel to prevent dirt accumulation, and integrates the valve mounting function, thereby justifying the increased structural complexity through functional consolidation
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
Prevents dirt accumulation and contamination of the pressure chamber, enhances component stability by reducing forces on weld seams, and simplifies the manufacturing process by eliminating the need for specialized flushing tools, resulting in improved reliability and reduced risk of damage during production.
Implementation Method 1
the low-pressure fuel flow constantly flushes the bore and pressure-limiting valve arranged therein
Implementation Method 2
a pressure-limiting valve for discharging an overpressure in the outlet volume
Implementation Method 3
a piston moves in translation in a pressure chamber and thus periodically compresses and relieves the pressure on the fuel
Data Source
AI summary
The invention relates to a high-pressure fuel pump (10) having a housing (12) in which a pressure-limiting valve (38) is arranged in a bore (36), wherein the bore (36) leads into an inflow volume (30) of a low-pressure inflow (22).