Fuel Injection Valve Sealing Gasket Axial Fixation
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Solution Overview
Problem
Existing injection valves for internal combustion engines face issues with axial movement of sealing gaskets, which affects the sealing efficiency and leads to fuel leakage, and previous solutions have not adequately addressed these problems without compromising the valve's performance.
Innovation Solution
The design incorporates a valve channel that widens at the high pressure region to axially fix the sealing gasket, with channels extending from the sealing gasket's upper edge and ending near the valve piece opening, allowing for effective fuel passage and pressure balance to prevent axial movement and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing gasket is used to prevent fuel leakage between high and low pressure regions, then sealing reliability is improved, but axial movement of the sealing gasket occurs leading to reduced sealing efficiency
Solution Approach 1:
The patent employs a sealing gasket with a specific profile shape that interacts with the valve channel geometry to provide both sealing and positional stability. The gasket's flexible nature allows it to conform to the sealing surface while its profile design prevents axial movement through geometric constraint rather than rigid fixation.
Solution Approach 2:
The patent introduces a channel structure in the valve piece that extends in the axial dimension, creating a geometric constraint that prevents axial movement of the sealing gasket. This additional dimensional feature (the channel depth and width variation) provides a new degree of freedom for controlling gasket position without affecting the sealing function.
2Stability of the object's composition
If a ring is added to prevent axial movement of the sealing gasket, then axial position stability is improved, but the ring in the working area deteriorates the performance of the injection valve
Solution Approach 1:
The patent divides the valve channel into different sections with varying cross-sectional dimensions. The channel is segmented such that one portion provides sealing while another portion provides axial constraint. This segmentation allows the sealing gasket to be constrained axially without requiring a separate ring component, thus maintaining injection performance.
Solution Approach 2:
The valve channel structure is designed to perform multiple functions: it provides the fuel passage, creates the sealing surface, and simultaneously constrains the axial movement of the sealing gasket. This multi-functionality eliminates the need for separate axial constraint components that would interfere with injection performance.
3Stability of the object's composition
If the valve channel is designed to widen in the high pressure region, then axial fixation of the sealing gasket is achieved, but device complexity increases
Solution Approach 1:
The patent merges the axial constraint function with the existing valve channel structure. Instead of adding a separate constraint mechanism, the channel's geometric features (width and depth variations) are designed to simultaneously provide fuel passage and sealing gasket fixation. This merging reduces overall device complexity despite the non-uniform channel geometry.
Data Source
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AI summary
The subject matter invention is an injection valve (10) for internal combustion engines, characterized by comprising at least one channel (241) which is provided so as to substantially widen at least some cart of the narrow region (242) of the high pressure region (24) that has substantially the same width as the sealing gasket (41); and which extends from said narrow region (242) up to the upper region (243) which is wider than the sealing gasket (41).