Injector Nozzle Ring Grooves for Precise Fuel Pressure Control
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Solution Overview
Problem
Fuel injectors in internal combustion engines require external pumping and control systems, which necessitate servicing and are inefficient in terms of injection timing and pressure management.
Innovation Solution
An injector nozzle design featuring a stem and flange with grooves, an annular nozzle ring, and a check valve system that allows for precise control of fuel injection through a combination of mechanical and electrical actuation, enabling efficient pressure management and reduced servicing needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If external pumping and control systems are used for fuel injection, then fuel can be supplied under sufficient pressure and injection timing can be controlled, but the system requires servicing and has inefficient pressure management
Solution Approach 1:
The patent combines the pump and injector into a single integrated unit where the pump chamber, injector chamber, and nozzle are formed as one piece. This eliminates external pumping systems while maintaining the capability to supply fuel under high pressure, directly resolving the contradiction between achieving sufficient injection pressure and reducing device complexity
Solution Approach 2:
The integrated pump-injector design is self-priming and automatically manages fuel pressure without requiring external control systems or servicing. The check valve and chamber design enable automatic fuel metering and injection, eliminating the need for complex external control mechanisms
2Loss of time
If external control systems are used for injection timing, then injection timing can be determined, but servicing is required and efficiency is reduced
Solution Approach 1:
The injector apparatus uses the engine's own cylinder pressure to automatically control injection timing. When cylinder pressure exceeds pump chamber pressure, the check valve opens and injection occurs automatically without external timing control, eliminating servicing requirements while maintaining precise timing control
Solution Approach 2:
The system uses hydraulic pressure differential between the cylinder and pump chamber to control injection timing. The check valve responds automatically to pressure changes, enabling timing control through fluid mechanics rather than mechanical or electrical external controls
3Manufacturing precision
If traditional injector design is used, then assembly is straightforward, but uncontrolled sac volumes remain and injection precision is limited
Solution Approach 1:
The injector is divided into distinct functional chambers (pump chamber, injector chamber, nozzle) with precise internal geometry. The nozzle includes specifically designed injector holes with controlled dimensions and orientations, eliminating uncontrolled sac volumes and enabling precise injection while maintaining manufacturability through the integrated design
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 solution provides high injection pressures, minimizes uncontrolled sac volumes, and allows for precise control of fuel injection timing and pressure, enhancing engine efficiency and reducing maintenance requirements.
Implementation Method 1
a bias member for biasing the valve into engagement with the valve seat
Implementation Method 2
the first surface and/or the flange surface include a plurality of grooves, the grooves defining a plurality of injector holes
Data Source
AI summary
An injector nozzle having a first part having a stem and a flange, the flange having a flange surface, a body including a wall defining a hole, an annular nozzle ring having a first surface and a second surface wherein the first surface and/or the flange surface include a plurality of grooves, the stem being received in the hole, the first part being secured to the body to secure the nozzle ring in place such that the first surface engages the flange surface, the second surface engages the body, and the plurality of grooves define a plurality of injector holes.