High Pressure Pump Asymmetric Fuel Chamber for Pulsation Damping
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Solution Overview
Problem
Existing high pressure pumps for internal combustion engines face challenges in achieving effective pressure pulsation reduction while maintaining a compact size, as the size of the pulsation damper and fuel chamber forming portion must be balanced to avoid interference with installation tools, leading to potential inefficiencies in pressure pulsation damping and increased pump size.
Innovation Solution
The high pressure pump design includes a fuel chamber forming portion placed radially outward from the plunger axis, allowing for increased size without interfering with the installation tool, and a pulsation damper positioned to effectively reduce pressure pulsation, while the fixable portions are configured to minimize tool interference during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer diameter of the pulsation damper is increased to achieve sufficient pressure pulsation reducing effect, then the pressure pulsation damping performance is improved, but the outer diameter of the fuel chamber forming portion is also increased, which increases the distance between through-holes and may cause tool interference during installation
Solution Approach 1:
The patent positions the fuel chamber forming portion asymmetrically relative to the through-holes of the fixable portions. Specifically, the fuel chamber forming portion is arranged such that it does not interfere with the path of installation tools accessing the through-holes, even when the pulsation damper has a large outer diameter. This asymmetric layout allows the pulsation damper to be sufficiently large for effective damping while maintaining ease of installation.
2Ease of operation
If the outer diameter of the fuel chamber forming portion is reduced to limit tool interference, then the installation ease is improved, but the outer diameter of the pulsation damper must be reduced, which deteriorates the pressure pulsation damping performance
Solution Approach 1:
The patent resolves the contradiction by utilizing spatial arrangement in multiple dimensions. The fuel chamber forming portion is positioned in a location that is radially outward from the plunger axis but arranged to clear the tool path. This three-dimensional spatial optimization allows both the pulsation damper to maintain a large outer diameter for effective damping and the fuel chamber forming portion to be positioned to avoid tool interference during installation.
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 design achieves a compact high pressure pump with enhanced pressure pulsation reduction and ease of installation, allowing for efficient fuel pressurization and supply to internal combustion engines without increasing the pump's size.
Implementation Method 1
The pulsation damper is placed in an inside of the fuel chamber and is operable to reduce pressure pulsation of the fuel in the fuel chamber
Implementation Method 2
The plunger is movable in such a manner that the plunger increases and decreases a volume of the pressurizing chamber upon movement of the plunger, and thereby the plunger is operable to pressurize the fuel in the pressurizing chamber
Data Source
AI summary
A housing-includes a pressurizing chamber. A plunger is moved to increase and decrease a volume of the pressurizing chamber, so that the plunger can pressurize the fuel in the pressurizing chamber. A fuel chamber forming portion is placed on a radially outer side of the plunger and forms a fuel chamber that is communicated with the pressurizing chamber. A pulsation damper is placed in an inside of the fuel chamber and is operable to reduce pressure pulsation of the fuel in the fuel chamber. Fixable portions are placed on a radially outer side of the plunger while each of the fixable portions includes a receiving through-hole. The fixable portions are fixed to an engine with bolts, which are provided to correspond with the receiving through-holes, respectively. The fuel chamber forming portion is displaced from axes of the receiving through-holes.