Piston Fuel Pump Valve Guide Element Design
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Solution Overview
Problem
Piston-type fuel pumps face challenges in production cost reduction, reliability enhancement, and wear minimization due to jamming and sealing issues, particularly with the outlet valve mechanism.
Innovation Solution
The piston-type fuel pump incorporates a guide element with separate guidance and retention sections, a holding ring with fuel passage openings, and a stroke stop to limit the valve element's opening stroke, reducing wear and noise while maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide element is integrated into the pump housing with additional joining measures, then the retention is more secure, but the production complexity and costs increase
Solution Approach 1:
The guide element is designed as an integrated component of the pump housing, where the guide section and retention section are merged into a single piece. The guide element features a retention section with external threading that directly engages with the pump housing, eliminating the need for separate joining measures while maintaining secure retention and reducing production complexity
Solution Approach 2:
The guide element serves multiple functions simultaneously: it provides guidance for the valve element through the guide section, ensures secure retention through the retention section with threading, and maintains structural integrity as part of the pump housing. This multi-functionality reduces the number of separate components needed
2Device complexity
If the valve element is allowed to move freely without guidance, then the structure is simpler, but jamming occurs and reliability decreases
Solution Approach 1:
The guide element acts as an intermediary component between the valve element and the pump housing. It provides a guided path for the valve element's movement, preventing jamming while maintaining a relatively simple overall structure. The guide section with its specific geometry ensures smooth movement without requiring complex mechanical guides
3Quantity of substance
If the valve element has a long opening stroke, then the valve opens fully for better flow, but wear and noise increase due to longer flight path and higher closing speed
Solution Approach 1:
The guide element incorporates a stroke stop feature that limits the maximum opening stroke of the valve element to a predefined value. This parameter control prevents excessive opening distance, thereby reducing the flight path, closing speed, and associated wear and noise while maintaining sufficient flow quantity through optimized valve seat geometry
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 production, reduces costs, enhances reliability by preventing jamming, and decreases wear and noise, leading to improved efficiency and performance of the piston-type fuel pump.
Implementation Method 1
the guide element has a guide section for guiding the valve element
Implementation Method 2
the guide element is pressed into a holding ring which in turn is pressed into the pump housing
Implementation Method 3
a valve spring (64) is also guided by the guide element
Implementation Method 4
the guide element has a stroke stop which limits the opening stroke of the valve element to a predefined value
Data Source
AI summary
A piston fuel pump for an internal combustion engine includes a pump housing, a piston, and a non-return discharge valve. The non-return discharge valve has a valve element and a guide element configured to guide the movement of the valve element. The guide element is at least indirectly pressed in a radial manner into an opening in the pump housing.