Injection Valve Liner Coating for Abrasive Fuel Wear Resistance
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Solution Overview
Problem
Internal combustion engine components, such as cylinders and pistons, wear out quickly when operating with abrasive fluids like coal particle fuel or fluids with poor lubricity, as existing materials and hardening/coating methods are ineffective for longer-than-wide cylinders.
Innovation Solution
The design incorporates a tubular liner system with varying diameters and lengths, coated with materials like diamond-like carbon or silicon dioxide, and a lubrication channel to reduce wear, allowing for even coating and improved lubrication within the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardening or coating processes are applied to cylinders and pistons, then wear resistance is improved, but the processes become impossible to perform when cylinders are longer than they are wide
Solution Approach 1:
The cylinder is divided into two separate parts: an inner cylindrical liner that can be independently coated and an outer cylinder housing. The liner is manufactured separately with appropriate wear-resistant coatings, then assembled into the cylinder housing. This segmentation allows the coating process to be applied effectively to the liner's accessible surface without the geometric constraints that would prevent coating the entire integrated cylinder structure.
Solution Approach 2:
The inner cylindrical liner acts as an intermediary component between the abrasive fluid and the outer cylinder. By applying wear-resistant coatings to this intermediate liner, the system achieves protection against abrasive wear while the liner itself serves as a removable and replaceable sacrificial element that can be coated using standard processes.
2Ease of manufacture
If conventional materials are used for cylinders and pistons, then manufacturing is simpler, but components wear out quickly when operating with abrasive fluids
Solution Approach 1:
The system uses composite construction combining different materials with complementary properties: the inner liner is made from materials suitable for abrasive fluid contact (such as hardened steel or coated materials), while the outer cylinder housing can be made from materials optimized for structural strength and manufacturability. This composite approach allows each component to be optimized for its specific function while maintaining overall system manufacturability.
Solution Approach 2:
Wear-resistant properties are applied locally only to the inner cylindrical liner that directly contacts the abrasive fluid, rather than requiring the entire cylinder assembly to be made from expensive, difficult-to-manufacture wear-resistant materials. This localized application of enhanced material properties achieves the necessary durability where it is most needed while maintaining ease of manufacture for the overall system.
3Ease of manufacture
If the cylinder and piston are designed with standard dimensions, then manufacturing is easier, but wear resistance cannot be improved without complex hardening processes
Solution Approach 1:
By segmenting the cylinder into a removable inner liner and outer housing, the design maintains standard overall cylinder dimensions for ease of manufacturing and integration, while the inner liner can be specifically engineered with enhanced wear resistance properties through coating or material selection without affecting the external dimensions of the complete cylinder assembly.
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 enhances the wear resistance and operational lifespan of engine components by providing a consistent, durable coating and effective lubrication, preventing abrasive fluid ingress and reducing wear on cylinders and pistons.
Implementation Method 1
the inner face of the tubular liner may be provided with a coating... capable of withstanding such abrasive materials
Implementation Method 2
a lubrication channel in the cylinder wall, extending towards the piston and configured to provide lubrication fluid or sealing oil to the piston
Data Source
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AI summary
The present invention relates to an injection valve for being in contact with an abrasive fluid, the injection valve comprising: a cylinder having a cylinder length, an inner cylinder diameter and a cylinder wall, and a piston having an outer piston diameter and an outer piston face, the piston being movable in the cylinder, characterised in that a first tubular liner is arranged between the cylinder wall and the piston so that the piston moves, at least partly, within the first tubular liner, the first tubular liner having a liner length, a first inner liner diameter and an inner liner face, the inner liner face comprising a coating. The invention further relates to an internal combustion engine comprising the injection valve according to the present invention. The present invention finally relates to a method of manufacturing the injection valve according to the present invention.