Fuel Injector Nozzle Drilling Sequence to Prevent Blind-Hole Wall Damage
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Solution Overview
Problem
Existing laser drilling methods for fuel injection holes in internal combustion engines face challenges in precisely deactivating the laser to prevent damage to the opposite wall of the blind hole, necessitating protective mechanisms and leading to higher tolerances and potential emission issues.
Innovation Solution
The method involves laser-drilling the injection holes first, followed by creating the cavity, ensuring the laser is deactivated before affecting the opposite wall, thus eliminating the need for protective mechanisms and reducing drilling depth tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser drilling is used to create injection holes, then surface smoothness and manufacturing precision are improved, but the risk of damaging the opposite wall of the blind hole increases
Solution Approach 1:
The patent applies preliminary action by first creating the cavity (removing material from the blind hole area) before performing laser drilling of the injection holes. This sequence ensures that the laser beam will not damage the opposite wall, as the cavity has already been formed to accommodate the laser drilling process without risking damage to structural areas.
Solution Approach 2:
The patent inverts the conventional sequence of operations. Instead of drilling injection holes first and then creating the cavity, it creates the cavity first and then drills the injection holes. This reversal eliminates the need for complex protective mechanisms and allows the laser to operate safely without risking damage to the opposite wall.
2Object-affected harmful factors
If protective mechanisms are used to prevent laser damage to the blind hole wall, then damage is avoided, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent eliminates the need for protective mechanisms by performing preliminary action - creating the cavity before laser drilling. This preparatory step removes the vulnerability that would otherwise require complex protective measures during the laser drilling process.
Solution Approach 2:
The patent extracts or removes the problematic element (the vulnerable opposite wall area) by creating a cavity in advance. This extraction eliminates the need for protective mechanisms, as the area that would be damaged is already prepared to accommodate the laser drilling process.
3Object-affected harmful factors
If the laser is deactivated quickly to prevent damage, then opposite wall damage is avoided, but manufacturing precision and emission control worsen
Solution Approach 1:
The patent applies preliminary action by creating the cavity before laser drilling, which establishes a safe working environment for the laser. This allows the laser to operate with relaxed timing constraints, maintaining both precision and avoiding damage without requiring rapid deactivation.
Solution Approach 2:
The patent changes the geometric parameters of the nozzle by creating a cavity, which alters the relationship between the injection holes and the blind hole wall. This parameter change allows greater drilling depth tolerance while preventing damage, as the cavity provides a buffer zone that accommodates variations in drilling depth.
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 approach prevents damage to the opposite wall, reduces drilling depth tolerance, and enhances fuel distribution by optimizing the nozzle design, thereby improving emission control and fuel efficiency.
Implementation Method 1
at least one injection hole (2) is produced in the nozzle (1) by laser drilling
Data Source
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AI summary
The invention relates to a method for producing a nozzle, in which an injection orifice of the nozzle for dispensing fuel is produced by means of laser drilling, and a cavity is formed in the nozzle along the longitudinal expansion thereof. The method is characterised in that the cavity formed in the injector is produced after the injection orifice has been produced.