Cam-Driven Fuel Injector Assembly Eliminating External Pump Leakage
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Solution Overview
Problem
Existing fuel injection systems for internal combustion engines rely on external high pressure pumps and long high pressure lines, which are prone to leakage and reduce system reliability.
Innovation Solution
A fuel injector assembly that uses a cam-driven feeder unit to accumulate fuel under pressure in an accumulator, eliminating the need for an external pump and reducing leakage risks by integrating the needle control, amplifier, and feeder units into a compact structural body mounted on the engine cylinder head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If an external high pressure pump and long high pressure lines are used to feed fuel to the accumulator, then high pressure fuel injection is achieved, but leakage risks increase and system reliability decreases
Solution Approach 1:
The invention extracts and eliminates the external high pressure pump and long high pressure lines from the system. Instead, it uses a cam-driven feeder unit integrated into the injector assembly to generate high pressure fuel locally, thereby removing the leakage-prone components while maintaining high pressure injection capability
Solution Approach 2:
The invention introduces an accumulator as an intermediary storage device between the cam-driven feeder unit and the injector. The accumulator stores pressurized fuel and provides it to the injector on demand, enabling high pressure injection without requiring continuous high pressure lines from an external pump
2Stress or pressure
If an external high pressure pump is implemented with long high pressure lines, then fuel can be delivered under high pressure, but the complexity of the system increases and leakage problems are harder to handle
Solution Approach 1:
The invention merges the feeder unit, amplifier unit, and needle control unit into a single integrated injector assembly. This consolidation eliminates the need for separate external pumps and long connecting lines, reducing system complexity while maintaining high pressure fuel delivery capability
Solution Approach 2:
The invention segments the fuel injection system into modular components: a cam-driven feeder unit for pressure generation, an accumulator for storage, and an integrated injector assembly for delivery. This segmentation allows each component to be optimized independently and simplifies the overall system architecture
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
Enables high-pressure fuel injection with rate shaping and multiple injection capabilities while minimizing leakage and load on the drive train, improving engine output and reliability.
Implementation Method 1
a cam driven feeder unit adapted to feed the accumulator with fuel under pressure
Implementation Method 2
an amplifier unit adapted to increase the pressure of a quantity of fuel coming from an accumulator of fuel under pressure
Data Source
AI summary
This fuel injector assembly (1) is used to inject fuel into a combustion chamber (52) of an engine. It comprises a needle control unit (14) adapted to actuate a needle (15) to deliver fuel to the chamber (52), an amplifier unit (13) adapted to increase the pressure of a quantity of fuel coming from an accumulator (3) of fuel under pressure and a cam (4) driven feeder unit (12) adapted to feed the accumulator (3) with fuel under pressure. No external pump is needed to feed the accumulator (3).