Fuel Pump Inlet Valve Seat Retention Under Cyclic Pressure
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Solution Overview
Problem
Existing fuel pumps with inlet valves rely on secondary means like interference fits, threaded connections, and welding, which increase complexity and cost while reducing robustness, to manage high cyclic loads during fuel pressurization.
Innovation Solution
A fuel pump design with a stepped inlet valve bore and a valve seat supported by a shoulder within the fuel pump housing, eliminating the need for secondary retention methods by directly carrying the high cyclic load, thus reducing components and processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secondary means such as interference fit, threaded connection, welding, or threaded fasteners are used to retain the inlet valve in the housing, then the inlet valve can be secured in position, but the device complexity increases and the robustness of the connection decreases
Solution Approach 1:
The inlet valve bore is integrated directly into the fuel pump housing as a single monolithic structure, merging the bore and housing into one component. This eliminates the need for separate retention mechanisms such as interference fits, threaded connections, welding, or fasteners, thereby reducing device complexity while maintaining connection robustness through the inherent structural integrity of the integrated design
Solution Approach 2:
The retention function is extracted from separate secondary means (fasteners, threads, welds) and incorporated into the primary structural design of the inlet valve bore itself. The bore's geometry and integration with the housing provide inherent retention capability, removing the need for additional retention components and processes
2Reliability
If secondary means such as interference fit, threaded connection, welding, or threaded fasteners are used to retain the inlet valve, then the inlet valve can be secured, but the manufacturing cost increases
Solution Approach 1:
The inlet valve bore and housing are merged into a single integrated component, eliminating the need for separate retention mechanisms. This consolidation reduces the number of manufacturing steps (no separate threading, welding, or fastening operations), thereby lowering manufacturing cost while maintaining connection stability through the integrated structure
Solution Approach 2:
The retention function is extracted from secondary manufacturing processes (threading, welding, fastening) and built into the primary molding or machining of the inlet valve bore. This eliminates costly secondary operations while ensuring connection stability through the inherent structural design
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 reduces the number of components and processes, lowering costs and enhancing the robustness of the connection, while allowing for efficient fuel delivery and pressure management.
Implementation Method 1
a valve member which is moveable between 1) an unseated position which provides fluid communication through the valve seat flow passage and 2) a seated position which prevents fluid communication through the valve seat flow passage
Data Source
AI summary
A fuel pump includes a fuel pump housing with a pumping chamber and an inlet valve bore which extends along an inlet valve bore axis. The inlet valve bore is stepped such that the inlet valve bore includes a shoulder which is traverse to the inlet valve bore axis. A pumping plunger reciprocates within a plunger bore along a plunger bore axis such that an intake stroke of the pumping plunger increases volume of the pumping chamber and a compression stroke of the pumping plunger decreases volume of the pumping chamber. An inlet valve assembly includes a valve seat with a valve seat flow passage extending therethrough, the valve seat abuts the shoulder and is urged toward the shoulder by pressure within the pumping chamber during the compression stroke. The inlet valve assembly also includes a valve member which is moveable between an unseated position and a seated position.