Injection Valve Pin Damping Mechanism
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Solution Overview
Problem
Existing injection valves for internal combustion engines experience significant bouncing when the injector closes due to the decoupling of the magnet armature and valve needle, leading to inefficiencies in fuel injection.
Innovation Solution
A new design where the valve element and armature assembly interlock with a pin to limit relative movement, creating a two-mass system, and incorporating a damping space filled with the injected fluid and a compression spring to reduce bouncing, with a pot-shaped body and adjustable damping features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the valve needle is separated from the magnetic armature and connected by a spring (two-mass system), then contact bounce is reduced when the injection valve closes, but device complexity increases
Solution Approach 1:
The system is divided into two separate masses: the magnetic armature and the valve needle, connected by a spring. This segmentation allows independent movement of each component, reducing contact bounce during closure while maintaining functional connectivity through the spring element.
Solution Approach 2:
A spring is introduced as an intermediary element between the magnetic armature and the valve needle. This spring acts as a buffer that absorbs shock and reduces contact bounce during valve closure, while still transmitting the necessary mechanical force to operate the valve.
2Object-affected harmful factors
If the valve element and armature assembly are decoupled to reduce contact bounce, then rebound behavior is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The valve needle is nested within the magnetic armature assembly, with the valve needle positioned inside the hollow needle of the armature. This nested arrangement reduces the overall number of external components and simplifies the structural layout, thereby reducing manufacturing precision requirements despite the decoupled two-mass system.
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 design effectively reduces bouncing behavior during closure, enhancing the precision and efficiency of fuel injection by utilizing a pin to limit movement and a damping chamber to absorb energy, improving the overall performance of the injection valve.
Implementation Method 1
The armature assembly is moved by means of an energized magnetic coil
Implementation Method 2
Within the armature assembly, a damping chamber is formed to dampen the movement of the valve element. This damping chamber fills with the fluid to be injected when the injection valve is used.
Data Source
Figure 1~2
AI summary
The present invention relates to an injection valve (1), particularly for injecting fuel into a combustion chamber, comprising a housing (2) with at least one injection opening (3), an armature assembly (11) linearly movable along a longitudinal axis (6) in the housing (2), a magnetic coil (26) acting magnetically on the armature assembly (11), a valve element (7) linearly movable with respect to the armature assembly (11) and the housing (2) in order to open and close the injection opening (3), and a pin (19) for limiting the movement of the valve element (7) with respect to the armature assembly (11).