Suction Valve Noise Reduction via Decoupled Pole Core
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Solution Overview
Problem
Existing electromagnetically controllable suction valves for high-pressure pumps in fuel injection systems generate unpleasant noise due to structure-borne and airborne noise transmission, and are not simple or inexpensive to produce.
Innovation Solution
The suction valve features a magnet assembly with an annular coil, a decoupled pole core and pole disk, plastic encapsulation, and a radial gap to reduce noise transmission, along with a centralized adjusting element and decentralized axial bores to minimize impact and vibrations, while maintaining magnetic field strength and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the armature strikes the stroke stop to define movement limits, then the armature movement space is compactly defined, but impact impulses generate structure-borne and airborne noise
Solution Approach 1:
The patent introduces a magnet pot that serves as an intermediary component between the armature and the magnet cover. When the armature strikes the magnet pot, the impact is absorbed and damped by the magnet pot material, preventing direct transmission of impact impulses to the magnet cover and surrounding structure. This mediator approach reduces both structure-borne and airborne noise while maintaining the compact definition of armature movement space.
Solution Approach 2:
The magnet pot is designed with material properties that provide cushioning before the impact occurs. The magnet pot acts as a pre-positioned energy absorber that dampens the impact impulse when the armature strikes, preventing the generation of strong excitation waves that would propagate as noise. This beforehand cushioning approach allows compact stroke stop definition without the harmful noise effects.
2Stability of the object's composition
If the pole core is rigidly connected to the pole disk for structural stability, then structural stability is improved, but vibrations are transmitted to surrounding components increasing noise
Solution Approach 1:
The magnet pot serves as a mediator between the pole core and the magnet cover/pole disk assembly. It provides the necessary structural connection while introducing damping properties that prevent vibration transmission. The magnet pot material absorbs vibrational energy, decoupling the pole core vibrations from the surrounding structure and reducing noise generation.
Solution Approach 2:
The patent changes the material parameters of the magnet pot to optimize damping properties. By selecting materials with appropriate damping characteristics, the magnet pot can effectively absorb vibrations from the pole core while maintaining structural stability. This parameter change approach allows the system to maintain structural integrity without transmitting harmful vibrations and noise.
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
The solution significantly reduces airborne noise by decoupling the pole core from the pole disk and using plastic encapsulation to absorb vibrations, resulting in a low-noise operation that is also cost-effective and simple to produce.
Implementation Method 1
a magnet assembly with a ring-shaped magnet coil for acting on an armature
Implementation Method 2
The plastic encapsulation provides damping because, in comparison to hard metal components, it is able to absorb and compensate for at least part of the vibrations
Implementation Method 3
a spring force of a spring in the closing direction
Implementation Method 4
The setting element allows the spring force of the armature spring to be set precisely, so that it can be designed as a damper between the armature and the upper stroke stop
Data Source
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AI summary
The invention relates to an electromagnetically actuated suction valve for a high-pressure pump of a fuel injection system, in particular a common rail injection system, comprising a magnetic subassembly (1) that includes an annular electromagnetic coil (2) for acting on an armature (3) which is accommodated in a cavity (4) of a valve body (5) so as to be liftable and to which the spring force of an armature spring (8) is applied in the direction of a liftable valve-closing element (7) cooperating with a valve seat; a pole core (10) lies across from the armature (3) at an operational air gap (9). The invention is characterized in that the pole core (10) penetrates a pole disk (11) and is decoupled from the pole disk (11) by a circumferential radial gap (12). The invention further relates to a high-pressure pump comprising a suction valve of said type.