Valve Assembly Spring Decoupling for Injection Valve Wear Reduction
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Solution Overview
Problem
Existing injection valves for internal combustion engines face challenges in maintaining reliable and precise fluid dosing under high pressures, leading to unwanted emissions and wear issues due to direct coupling between the valve needle and actuator, which results in dynamic behavior and contact area wear.
Innovation Solution
A valve assembly with a spring element, such as a coil spring, decouples the valve needle from the armature, providing a delayed movement and damping effect, while an armature support spring ensures stable actuation, reducing wear and maintaining long-term contact and energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the valve needle is directly coupled to the actuator, then the actuation response is fast, but the dynamic behavior causes wear and reduces reliability
Solution Approach 1:
A spring element is introduced as an intermediary between the armature and the valve needle. This spring element decouples the direct mechanical connection, allowing the armature to move freely while still transmitting actuation force to the valve needle through the spring, thereby reducing wear at the contact area while maintaining responsive actuation.
2Power
If the valve needle is directly coupled to the actuator, then the energy transmission is efficient, but the dynamic behavior increases wear and reduces long-term operation reliability
Solution Approach 1:
The spring element serves as a mediator that maintains energy transmission efficiency while protecting the contact area from wear. It allows for controlled movement and force transmission, ensuring long-term reliable operation by reducing mechanical stress and wear at the interface between the armature and valve needle.
3Reliability
If a spring element is introduced to decouple the valve needle from the armature, then wear is reduced and reliability improves, but the device complexity increases
Solution Approach 1:
The spring element is a simple intermediary component that provides significant wear reduction and reliability improvement. By using a basic spring mechanism rather than a complex decoupling system, the increase in device complexity is minimized while still achieving the desired reduction in contact area wear and improvement in long-term operation reliability.
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 enhances the dynamic behavior of the valve needle, minimizes wear, and ensures reliable long-term operation by dampening the dynamic behavior and maintaining a good contact between the valve needle and armature, thus reducing static flow drift and improving energy transmission.
Implementation Method 1
A spring element is arranged in the recess axially between the ring element and the protrusion of the armature
Implementation Method 2
providing a delayed movement and damping effect
Implementation Method 3
an electro-magnetic actuator unit being designed to actuate the valve needle
Data Source
AI summary
A valve assembly for an injection valve may comprise a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion, a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions, the valve needle comprising a ring element extending radially and arranged at an axial end of the valve needle facing away from the fluid outlet portion, and an electro-magnetic actuator unit being designed to actuate the valve needle.