Compact High-Pressure Fuel Pump Intake Valve Design
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Solution Overview
Problem
Conventional high-pressure fuel supply pumps with electromagnetically-driven intake valves require a large space for the valve and valve holder between the valve seat and pressurizing chamber, making it difficult to miniaturize the pump.
Innovation Solution
The design eliminates the valve holder and integrates the valve guide within the space between the valve seat and the circumferential surface of the pressurizing chamber, using a recessed cylindrical space and laser-welding to seal the intake valve mechanism, allowing for a compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve holder is used to guide the valve in conventional high-pressure fuel supply pumps, then the valve operation is stable and reliable, but the axial space between the valve seat and pressurizing chamber increases, making the pump larger
Solution Approach 1:
The patent merges the valve guide function into the valve holder by forming a guide groove directly on the inner peripheral surface of the valve holder. This integration eliminates the need for a separate valve guide component while maintaining the guiding function, thereby reducing the axial space occupied by the intake valve device.
Solution Approach 2:
The valve holder is designed to perform multiple functions: it provides structural support, guides the valve through the guide groove, and seals the intake passage when the valve closes. By making the valve holder multi-functional, the patent reduces the number of separate components needed, contributing to compactness.
2Length of stationary object
If the axial size of the intake valve device is reduced for miniaturization, then the pump becomes more compact, but the space for valve and valve holder becomes insufficient, compromising valve operation
Solution Approach 1:
Instead of reducing valve size in all dimensions, the patent optimizes the axial dimension by eliminating the separate valve guide. The guide groove is formed radially on the valve holder's inner surface, utilizing the radial dimension for guidance while minimizing axial space consumption.
Solution Approach 2:
The valve is nested within the valve holder structure, with the guide groove formed directly on the valve holder's inner peripheral surface. This nesting arrangement allows the valve to operate within the confined space of the valve holder without requiring additional axial space for a separate guide component.
3Reliability
If a separate valve guide is provided in addition to the valve holder, then the valve guidance is precise and reliable, but the device complexity and number of parts increase
Solution Approach 1:
The patent combines the valve guide function with the valve holder structure by forming a guide groove directly on the inner peripheral surface of the valve holder. This merger eliminates the need for a separate valve guide component, reducing device complexity while maintaining precise valve guidance through the integrated groove.
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 approach enables a more compact pump design by reducing the axial size of the intake valve device, improving operational efficiency and responsiveness while maintaining smooth fuel flow and valve operation.
Implementation Method 1
an electromagnetically-driven intake valve is constituted by a so-called outward open type valve provided with a valve on the side of a pressurizing chamber with respect to a valve seat
Implementation Method 2
using a recessed cylindrical space and laser-welding to seal the intake valve mechanism
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A high-pressure fuel supply pump, comprising: a piston plunger (2) reciprocating within a pressurizing chamber (12); and an electromagnetically-driven intake valve mechanism (200) provided at an inlet of the pressurizing chamber (12), wherein the electromagnetically-driven intake valve mechanism (200) includes an anchor (207) which pulls a plunger rod (201), a fixed core (206) which attracts the anchor (207), and a yoke (205) in which inner peripheral part the fixed core (206) is fixed; wherein the fixed core (206) is rigidly fixed to a bottom part of the yoke (205) by press-fitting, wherein a through hole (206H) is formed at a bottom part of the fixed core (206) and wherein the fixed core (206) is press-fitted in an inner peripheral surface of a cylindrical space (205H) of the yoke (205) .