Fuel Injector Filter Assembly Conic Taper Press-Fit Deformation
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Solution Overview
Problem
The existing filter assemblies in fuel injectors are prone to deformation and rupture during press-fitting, leading to unfiltered fuel reaching the delicate valve system due to undefined positioning and excessive forces.
Innovation Solution
A filter assembly design featuring a tubular filter housing with a conic taper and a frame having conic sections with specific opening angles, allowing for improved axial press-fitting with reduced deformation and enhanced radial support, ensuring precise positioning and preventing physical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filter assembly is press-fitted into the injector, then the filter assembly is secured in the injector, but deformation of the filter element may occur and the position of the filter assembly may be poorly defined
Solution Approach 1:
The patent applies conical surfaces (curved geometry) to both the filter housing taper and the frame conic sections. The conical geometry distributes press-fitting forces along the inclined surface rather than concentrating them at a single point or edge, reducing stress concentration and deformation while maintaining secure positioning. The curved contact surfaces enable gradual force distribution during axial press-fitting.
2Ease of manufacture
If considerable forces act on the filter assembly during press-fitting, then the filter assembly is installed in the injector, but rupture of the filter element may occur
Solution Approach 1:
The conical contact surfaces distribute the installation forces over a larger area and along a gradual slope, preventing stress concentration that could cause rupture. The inclined geometry allows forces to be applied axially while being distributed radially across the conical interface, protecting the filter element from localized excessive stresses during installation.
3Ease of operation
If the filter assembly position is poorly defined, then press-fitting is simplified, but unfiltered fuel may pass towards the valve system
Solution Approach 1:
The conical geometry provides self-aligning characteristics during press-fitting. The inclined surfaces guide the filter assembly into proper orientation as it is pressed in axially, ensuring correct positioning without requiring complex alignment procedures. The converging conical surfaces naturally导向 the filter element to its final positioned state.
Data Source
AI summary
The present disclosure relates to filters in general, and the teachings may be applied to a filter assembly for use in a fuel injector, the fuel injector, and internal combustion engines. A filter assembly may include: a filter element with a frame having an axial end and a tubular filter housing receiving the filter element. The filter housing may have a side wall with a taper supporting the axial end. The taper may have the shape of a conic section with an opening angle γ of less than 180°. The outer circumferential surface of the frame may include a first section in the section of the taper having the shape of a conic section with an opening angle α of less than 180°.