High Pressure Pump Valve Stability via Stopper Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High pressure pumps face instability in fuel metering due to unintentional valve closure, leading to unpredictable fuel quantity and pressure, caused by fuel collision with valve members, especially at low rotational speeds, and potential sliding malfunctions or abrasion.
Innovation Solution
A high pressure pump design incorporating a plunger, valve body, valve member, stopper, urging members, and an electromagnetic drive device, with a specific fuel passage configuration and communication passages to limit fuel collision and lateral forces, ensuring stable valve operation and preventing self-closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the valve member is allowed to move freely in response to fuel pressure, then the valve can respond quickly to fuel flow changes, but the fuel flow may unintentionally collide with the valve member end surface and cause self-closing
Solution Approach 1:
A stopper is introduced as an intermediary component between the fuel flow and the valve member. The stopper has a blocking surface that intercepts fuel flow before it can collide with the valve member end surface, preventing self-closing while allowing the valve to remain responsive to electromagnetic actuation signals
Solution Approach 2:
The stopper is positioned in advance to block the fuel flow path before the fuel can reach the valve member. This preliminary blocking action prevents the harmful collision from occurring in the first place, ensuring stable valve operation during low-speed cam rotation
2Reliability
If the stopper blocks fuel flow completely, then self-closing is prevented, but the fuel pressure cannot equalize between interior and exterior of the valve member
Solution Approach 1:
The stopper is designed with differentiated local properties: the blocking surface facing the fuel passage provides complete flow blockage to prevent self-closing, while the bottom surface includes through-holes that allow localized fuel passage for pressure equalization. This local quality differentiation resolves the contradiction between blocking and pressure balancing
Solution Approach 2:
The stopper structure is segmented into functional zones: an upper blocking portion that intercepts fuel flow and a lower pressure equalization portion with through-holes. This segmentation allows the single component to simultaneously achieve flow blocking and pressure balancing functions
3Force
If the urging member is positioned radially inward of the valve member, then lateral forces are reduced, but the valve member may still experience sliding malfunction at low rotational speeds
Solution Approach 1:
The stopper serves as a mediator that intercepts fuel flow before it can exert lateral forces on the valve member. By positioning the blocking surface upstream, the stopper prevents fuel from directing force against the valve member side surfaces, eliminating sliding malfunction risks
Solution Approach 2:
The stopper performs preliminary flow direction control, intercepting and redirecting fuel flow before it can reach the valve member. This preliminary action prevents harmful lateral forces from developing in the first place, ensuring reliable valve sliding even at low rotational speeds
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 stabilizes fuel quantity and pressure discharge by reducing fuel collision and lateral forces on the valve member, enhancing valve responsiveness and extending component lifespan.
Implementation Method 1
The electromagnetic drive device reciprocates the valve member toward and away from a valve seat formed in a valve body through a needle
Implementation Method 2
a spring (21), which is engaged with the bottom portion (52) and the valve member (40), to urge the valve member (40) in a valve closing direction
Implementation Method 3
a needle (60), which is engaged with the valve member (40), and a spring (22), which is engaged with the needle (60), to urge the valve member (40) in a valve opening direction
Implementation Method 4
a plunger (13), which is reciprocally movable, a pressurizing chamber (113), in which the plunger (13) is placed to pressurize fuel
Data Source
AI summary
A volume chamber is formed by a valve member, an inner peripheral wall of a tubular portion and a bottom portion of a stopper when the valve member is engaged with tubular portion. A communication passage communicates between the volume chamber and one of an intermediate passage of a valve body and a tertiary passage of the stopper. The communication passage is formed at a location, which is spaced from a contact surface between the tubular portion and the valve member by a first predetermined distance and is also spaced from a contact surface between the bottom portion and the first urging member by a second predetermined distance.