Cup-Shaped Cylinder Fuel Pump Housing Integration
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Solution Overview
Problem
The existing high-pressure fuel pumps require a complex and larger cylinder holder to manage the thrust forces and fuel discharge pressure, leading to increased size and complexity, and the cylinder is prone to displacement due to pressure differences.
Innovation Solution
A cup-shaped cylinder is fitted to the inner cylindrical surface of the pump housing, forming a compression chamber with the ceiling portion, which allows the cylinder to be pressed against the housing by the compression chamber pressure, simplifying the cylinder holder and preventing displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylinder holder is used to fix the cylinder against thrust forces and fuel discharge pressure, then the cylinder can be secured in position, but the device complexity and total size increase
Solution Approach 1:
The invention merges the cylinder holder and pump housing into a single integrated structure. The holder is formed as an integral part of the pump housing body, eliminating the need for a separate cylinder holder component. This reduces device complexity while maintaining the necessary fixation function against thrust forces and fuel discharge pressure.
Solution Approach 2:
The pump housing body is designed to serve multiple functions: it contains the compression chamber, provides structural support, and acts as the cylinder holder to secure the cup-shaped cylinder. This multi-functionality eliminates the need for dedicated separate components, reducing overall device complexity while maintaining reliability.
2Reliability
If the fixing force of the cylinder holder is increased to prevent cylinder displacement at high fuel discharge pressure, then the cylinder remains securely fixed, but the cylinder holder becomes larger and more complicated
Solution Approach 1:
By integrating the cylinder holder into the pump housing body, the structure utilizes the existing housing geometry to provide fixation. This eliminates the need for additional length or volume dedicated to a separate holder component, maintaining compact size while ensuring stable cylinder positioning at high pressures.
Solution Approach 2:
The cup-shaped cylinder is designed with a bottomed structure that receives downward thrust forces from the plunger. The pump housing body provides upward reaction forces through its integrated holder structure, creating a balanced force system that secures the cylinder without requiring excessive fixation strength or increased component size.
3Device complexity
If the cup-shaped cylinder is pressed against the pump housing by compression chamber pressure, then the cylinder holder structure is simplified, but the fixing mechanism relies on pressure differential
Solution Approach 1:
The integration of the cylinder holder into the pump housing creates a robust, monolithic structure that eliminates complex assembly requirements. The pressure differential mechanism works within this integrated structure to provide reliable fixation, simplifying the overall design while maintaining security against cylinder displacement.
Solution Approach 2:
The fuel discharge pressure, which creates thrust forces that could displace the cylinder, is converted into a beneficial force by the cup-shaped design. The pressure acts on the bottomed surface of the cup, pressing it firmly against the pump housing and enhancing fixation reliability without requiring additional mechanical restraint mechanisms.
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 results in a compact, lightweight, high-pressure fuel pump with improved reliability and reduced component count, effectively managing high fuel discharge pressures without the need for a large and complex cylinder holder.
Implementation Method 1
the cylinder is pressed, by the pressure in the compression chamber, against the pump housing
Data Source
AI summary
High pressure fuel pump includes a cylinder which is fitted in a concave portion formed in a pump housing and which defines a compression chamber of the pump and a plunger which pressurizes, by sliding against the cylinder, the fluid in the compression chamber. It is structured such that the fluid sucked into the compression chamber by reciprocating motion of the plunger is pressurized and is then discharged from the compression chamber. The cylinder is formed of a cylindrical member which has a ceiling portion and in which the compression chamber is partitionedly formed. A fuel suction path formed in the pump housing reaches the compression chamber through the cylinder and a fuel discharge path formed in the pump housing is connected to the compression chamber through the cylinder. The cylinder is pressed against the pump body by a fuel pressurizing force applied to the cylinder.