High-Pressure Fuel Pump Discharge Valve with Segmented Webs
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Solution Overview
Problem
High-pressure fuel pumps face limitations in hydraulic flow and delivery capacity due to restricted flow paths in existing outlet valves, which impede the efficient transfer of fuel under varying pressure conditions.
Innovation Solution
The design incorporates a valve ball and body with axially protruding webs forming radial flow paths and a stop body with uniformly distributed recesses, allowing for increased hydraulic cross-section and improved flow efficiency, along with a compact valve spring arrangement and manufacturing using metal powder injection molding or stamped parts for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outlet valve uses a conventional design with limited flow paths, then the valve structure remains simple, but the hydraulic delivery capacity is restricted
Solution Approach 1:
The valve body is segmented into multiple axially protruding webs that divide the flow area into several radial flow paths. This segmentation increases the total hydraulic cross-section while maintaining a relatively simple overall valve structure, directly resolving the contradiction between delivery capacity and structural complexity.
Solution Approach 2:
The flow paths transition from axial to radial direction by using axially protruding webs that create radial flow channels. This dimensional change in flow direction enables enlarged hydraulic cross-section without increasing the axial height of the valve, improving delivery capacity while keeping the valve compact.
2Productivity
If the valve body is designed with a larger outside diameter to accommodate more flow paths, then the hydraulic cross-section increases, but the valve size and housing requirements increase
Solution Approach 1:
The invention utilizes the radial dimension within the existing valve diameter by creating radial flow paths between axially protruding webs. This approach increases the effective hydraulic cross-section without increasing the valve's outside diameter, as the flow paths are formed within the existing radial space through strategic web placement.
Solution Approach 2:
The valve body is divided into multiple segments (webs) that create separate flow channels within the same radial envelope. This segmentation allows the hydraulic cross-section to be increased by utilizing the full radial space more efficiently, rather than requiring a larger overall diameter.
3Ease of operation
If the valve ball is guided by a single radial collar, then the guidance is simple, but the flow area is severely restricted
Solution Approach 1:
The single radial collar is segmented into multiple axially protruding webs that are distributed around the valve ball. These webs provide guidance functionality while leaving gaps between them that maintain open flow paths, thus preserving both guidance capability and flow area.
Solution Approach 2:
The continuous radial collar is extracted and replaced by discrete axially protruding webs. This extraction removes the flow-restricting element while retaining the essential guidance function, as the webs are positioned to guide the valve ball radially without forming a complete circumferential barrier.
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 configuration enhances the hydraulic delivery capacity and fatigue strength of the high-pressure fuel pump, ensuring efficient fuel transfer and reduced manufacturing costs while maintaining compactness and simplified assembly.
Implementation Method 1
a valve spring, which acts on the valve ball with an axial force against the sealing seat
Implementation Method 2
the guide section comprises a first plurality of axially protruding webs, between which first flow paths are formed, with an opening radially outward being present at least between two adjacent ones of the webs. The webs can thus guide the valve ball radially
Implementation Method 3
fuel can flow through an area radially outside of the webs, as a result of which a hydraulic cross section can be enlarged and the delivery capacity of the high-pressure fuel pump can be improved
Data Source
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AI summary
The invention relates to a high-pressure fuel pump (10) comprising a discharge valve (32) with a valve ball (38) and a valve body (58), said body having a sealing section provided with a sealing seat (68) and having a guiding section (70), in which the valve ball is guided (38). According to the invention, the guiding section (70) has a first plurality of axially projecting lands (72), between which first flow paths (74) are formed, and a gap (75) facing radially outwards is situated at least between two adjacent lands (72).