Complementary Curved Stop Faces for Hydraulic Damping in Fuel Pump Actuators
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Solution Overview
Problem
Electromagnetic valves in high-pressure fuel pumps generate disturbing noise and have a limited service life due to the impact between the armature and pole piece during operation, leading to potential damage and frequent replacements.
Innovation Solution
The armature and pole piece are designed with complementary geometric shapes, such as protrusions and recesses, to displace a medium and decelerate the armature, thereby damping the impact and reducing noise emission in a hardware-based approach, independent of electronic actuation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the armature and pole piece are designed with flat stop faces that impact directly, then the electromagnetic valve can be constructed simply, but noise emission increases and service life decreases due to impact damage
Solution Approach 1:
The stop face of the armature and counter stop face of the pole piece are designed with complementary curved geometries (protrusion and recess) instead of flat surfaces. This curvature allows the medium to be displaced and compressed during armature movement, creating a damping effect that reduces impact noise while maintaining construction simplicity.
2Device complexity
If the armature and pole piece are designed with flat stop faces that impact directly, then the electromagnetic valve can be constructed simply, but service life decreases due to impact damage
Solution Approach 1:
The complementary curved geometries of the stop face and counter stop face create a progressive compression of the medium during armature movement. This gradually decelerates the armature before impact, reducing mechanical stress and damage on the faces, thereby extending service life without complicating the construction.
3Object-generated harmful factors
If software-based solutions are used to reduce impact (prematurely reducing energizing or applying counter voltage), then noise emission can be reduced, but the solution depends on electronic actuation systems and requires additional control complexity
Solution Approach 1:
The patent replaces software-based electronic control solutions with a hardware-based mechanical solution. The complementary geometric shapes of the stop faces create a passive mechanical damping effect through medium displacement and compression, eliminating the need for complex electronic actuation systems or software control while effectively reducing noise emission.
4Object-generated harmful factors
If damping layers are added to reduce impact, then noise emission can be reduced, but device complexity increases due to additional elements
Solution Approach 1:
The damping function is merged into the existing stop faces of the armature and pole piece through complementary geometric shaping. Instead of adding separate damping layers or elements, the damping effect is integrated directly into the impact surfaces themselves, reducing noise emission without increasing device complexity or the number of components.
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 effectively reduces noise emission and increases the service life of electromagnetic valves by amplifying medium displacement, resulting in enhanced damping of the armature movement without the need for additional damping elements.
Implementation Method 1
An electromagnetic actuator (26) includes a pole piece (40) and an armature (38) which by means of an electromagnet (36) is movable in the direction of the pole piece (40)
Implementation Method 2
The stop face (46) and the counter stop face (48) in a movement of the armature (38) in the direction toward the pole piece (40) engage in one another so as to displace a medium (50) which is disposed between the stop face (46) and the counter stop face (48)
Data Source
AI summary
An electromagnetic actuator includes an armature which has a stop face, and a pole piece which has a counter stop face, wherein the stop face and the counter stop face in terms of geometry are configured so as to be mutually complementary such that the stop face and the counter stop face in a movement of the armature toward the pole piece engage in one another, displacing a medium which is disposed between the stop face and the counter stop face. An electromagnetic valve may include the electromagnetic actuator, and a high-pressure fuel pump may include the electromagnetic valve.