Fuel Injection Valve Shift Permittance Friction Reduction
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Solution Overview
Problem
Fuel injection valves in internal-combustion engines face deterioration in injection characteristics due to positional shifts between the cylinder head and delivery pipe, leading to deformation and potential damage, especially in varying temperature environments.
Innovation Solution
A fuel injection valve design incorporating a housing with a nozzle hole, a reciprocating needle, a coil, a fixed core, a movable core, a shift permitting member, and a friction reducing part, such as a washer with lubricating films, to allow perpendicular displacement and reduce friction, preventing deformation from positional shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tolerance ring is used to permit attachment position shift, then the fuel injection valve can accommodate position shifts, but friction between the tolerance ring and cylinder head prevents sufficient displacement, causing valve deformation
Solution Approach 1:
A friction reducing part (washer with lubricating film) is introduced as an intermediary between the tolerance ring and the cylinder head. This mediator reduces friction at the contact interface, enabling the tolerance ring to smoothly accommodate position shifts without causing valve deformation. The lubricating film allows the tolerance ring to rotate and displace freely, resolving the contradiction between position shift accommodation and injection characteristic maintenance.
2Reliability
If the fuel injection valve is rigidly fixed to maintain injection characteristics, then deformation is prevented, but position shifts between delivery pipe and cylinder head cause stress concentration and potential damage
Solution Approach 1:
The fuel injection valve is designed with dynamic adaptability through the tolerance ring and friction reducing part combination. Instead of rigid fixation, the system allows controlled movement and rotation of the tolerance ring to accommodate position shifts. This dynamic design enables the valve to adapt to thermal expansion and contraction of engine components while maintaining stable injection characteristics and preventing stress concentration.
3Adaptability or versatility
If the tolerance ring is designed to permit large displacement, then position shift is accommodated, but the valve may become unstable or deform without proper friction control
Solution Approach 1:
The friction characteristics at the contact interface between the tolerance ring and cylinder head are modified by introducing a lubricating film on the friction reducing part. This parameter change (from high friction to low friction) enables the tolerance ring to smoothly accommodate position shifts and rotate as needed, while the valve body remains stable due to its rigid structure and proper mounting geometry. The lubricated interface allows controlled movement without compromising overall valve stability.
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 prevents deformation and maintains fuel injection characteristics by allowing sideways displacement of the valve, reducing friction and alleviating forces that cause deformation, thus enhancing operational stability and longevity.
Implementation Method 1
a friction reducing part that is provided between the internal-combustion engine and the shift permitting member. The friction reducing part reduces friction between the internal-combustion engine and the shift permitting member
Implementation Method 2
such as a washer with lubricating films, to allow perpendicular displacement and reduce friction
Data Source
AI summary
A fuel injection valve includes a housing having a nozzle hole, a valve seat, and a fuel passage; a needle that is accommodated in the housing to be capable of reciprocating in an axial direction of the housing and that opens or closes the nozzle hole; a coil; a fixed core; a movable core; a shift permitting member that is provided between the housing and an internal-combustion engine to permit a shift of an attachment position at time of attachment of the housing and the engine; and a friction reducing part that is provided between the engine and the shift permitting member to reduce friction between the engine and the shift permitting member. The friction reducing part permits displacement of the housing in a direction perpendicular to the axial direction of the housing.