Electromagnetic Fuel Pump Valve Stabilization via Pressure Equalizing Hole
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Solution Overview
Problem
High-pressure fuel supply pumps with electromagnetically driven intake valves experience unstable valve movements due to high fuel flow rates, leading to significant pressure variations in the common rail, which negatively affect fuel injection.
Innovation Solution
A pressure equalizing hole is introduced between the valve and valve stopper, connecting the spring storage space to the surrounding fluid passage, allowing pressure to be evenly distributed without traversing the spring, stabilizing the valve's closing force and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a light valve is used in the high-pressure fuel supply pump, then the valve can respond quickly to fuel flow changes, but the valve experiences unstable movements due to high fuel flow rates acting in multiple directions
Solution Approach 1:
A guide hole is provided in the valve stopper that extends from the outer peripheral side to the inner peripheral side, serving as an intermediary pressure equalization passage. This guide hole allows fuel pressure to act uniformly on the valve from all directions, stabilizing the valve's movement while maintaining its light weight and quick response characteristics.
2Stress or pressure
If fuel pressure is introduced into the enclosed spring storage space from the transverse direction across the spring, then the enclosed space is pressurized, but the light valve exhibits unpredictable unstable movements leading to intense discharge flow rate variation
Solution Approach 1:
The pressure equalization function is segmented from the main fuel passage and implemented through a separate guide hole in the valve stopper. This segmentation allows independent control of pressure distribution to the valve, ensuring uniform pressure application that stabilizes discharge flow rate while maintaining necessary pressure in the enclosed spring storage space.
Solution Approach 2:
The guide hole in the valve stopper acts as an intermediary passage that distributes fuel pressure uniformly to the valve from both outer and inner peripheral sides. This intermediary structure prevents direct asymmetric pressure application that would cause unstable valve movements and discharge flow rate variations.
3Speed
If the valve is made very light to improve responsiveness, then the valve can react quickly to intake and spilling operations, but the valve acts violently in multiple directions including leftward, rightward, and circumferential directions
Solution Approach 1:
The guide hole in the valve stopper serves as a pressure equalization intermediary that counteracts the harmful effects of asymmetric fuel flow forces on the light valve. By providing uniform pressure from all directions through this intermediary passage, the valve maintains its light weight and quick responsiveness while eliminating violent unintended movements in various directions.
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 reduces unintended discharge flow variations and stabilizes the valve movement, minimizing pressure variations in the common rail, thereby enhancing fuel injection consistency.
Implementation Method 1
A pressure equalizing hole which connects a spring storage space, provided between a valve and a valve stopper, to a surrounding fluid passage
Implementation Method 2
A spring is located between the stopper and the valve, the spring biasing the valve in the closing direction
Implementation Method 3
high-pressure fuel supply pump including an electromagnetically driven intake valve
Data Source
AI summary
A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.