High-Pressure Fuel Pump Valve Receiving Section Geometry
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Solution Overview
Problem
High-pressure fuel pumps for internal combustion engines face challenges in efficiently managing fuel pressure and reducing the impact of manufacturing tolerances and axial vibrations, which can lead to increased loading on valve springs and potential damage to the fuel system.
Innovation Solution
A high-pressure fuel pump design featuring a receiving section with multiple radial areas, including flat annular surfaces, that enhances the force distribution on the closing element and reduces axial vibrations, allowing for improved flow and reduced loading on the valve spring, along with a pressure-limiting valve geometry that includes a ball closing element and specific annular surface angles to optimize hydraulic properties and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional pressure-limiting valve design is used, then the structure is simple, but the valve spring loading is increased and the closing element experiences axial vibrations
Solution Approach 1:
The receiving section is divided into multiple radial areas (first radial area, second radial area, third radial area) with different surface orientations and geometries. Each area is optimized to perform specific functions: the first area receives fuel flow at an oblique angle to generate force components, the second area provides a flat surface for uniform closing element contact, and the third area guides the closing element. This local differentiation reduces axial vibrations and optimizes valve spring loading while maintaining overall structural simplicity.
2Ease of manufacture
If the receiving section has a single flat surface, then manufacturing is simple, but the force distribution on the closing element is uneven
Solution Approach 1:
The receiving section incorporates multiple radial areas with distinct surface characteristics. The second radial area features a flat annular surface that provides uniform contact for the closing element, ensuring even force distribution. The first radial area has an oblique surface that deflects fuel flow to generate beneficial force components. This localized surface differentiation achieves uniform force distribution while remaining manufacturable through standard machining processes.
Solution Approach 2:
The receiving section utilizes curved and oblique surfaces in the first and third radial areas to guide fuel flow and closing element movement. The oblique surface in the first radial area deflects fuel flow at an angle to generate force components that counteract axial vibrations. The curved geometry of the third radial area provides proper guidance for the closing element during its opening and closing cycles.
3Stress or pressure
If the valve spring is heavily loaded, then the valve remains closed under high pressure, but the opening process becomes non-uniform and the closing element experiences stress
Solution Approach 1:
The design changes the geometric parameters of the receiving section, specifically the angles and orientations of the radial surfaces. The first radial area is oriented at an oblique angle to deflect fuel flow and generate force components that assist in opening the valve. This geometric parameter optimization reduces the required valve spring preload while ensuring uniform valve opening and reducing closing element stress, thereby improving both pressure containment and component strength.
4Productivity
If the mass flow through the valve is increased to quickly reduce excess pressure, then the valve opening speed increases, but the impacts between closing element and valve seat increase
Solution Approach 1:
The second radial area provides a flat annular surface that ensures uniform contact between the closing element and the receiving section during closing. This uniform contact distribution reduces impact forces and prevents localized stress concentrations. The optimized geometry of all radial areas works together to enable smooth opening and closing transitions, allowing high mass flow rates for quick pressure reduction while minimizing impacts between the closing element and valve seat.
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 results in a more uniform opening of the valve, reduced stress on the valve spring and seat, lower axial vibrations, and a higher mass flow rate, enhancing the overall function of the high-pressure fuel pump while simplifying manufacturing and reducing costs.
Implementation Method 1
A calculation of the forces acting on the elements described is possible, for example, by means of a corresponding momentum equation
Implementation Method 2
less loading of a valve spring acting on the closing body in the closing direction
Data Source
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AI summary
A high-pressure fuel pump for a fuel delivery system of an internal combustion engine includes a pressure limiting valve positioned between an outlet and an inlet of the pump. The valve includes a spring-loaded closing element and a closing body that radially holds the closing element in place, and that has a concave receiving portion configured to at least partially receive the closing element. The receiving portion has a radially outer first area with a first opening angle, and a radially inner second area with a second opening angle larger than the first opening angle. The first area and the second area are located outside of a contact region between the closing element and the closing body.