Fuel Injector Actuator Stroke Limiting Stop Plate
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Solution Overview
Problem
Fuel injection valves for diesel engines have complex constructions that increase production costs due to long, thin high-pressure fuel bores and an unfavorably positioned storage chamber, affecting the overall length and external dimensions of the housing.
Innovation Solution
A fuel injection valve design with an actuator arrangement integrated into a recess in the housing body, featuring a stop plate that limits the actuator shaft's stroke and positions functional elements close to the nozzle body, allowing for a compact and simple construction with off-axis actuation and a slim storage chamber, reducing production complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the storage chamber is mounted in the upper area of the fuel injector, then the fuel injector can be assembled, but the overall length and external dimensions of the housing are unfavorably affected
Solution Approach 1:
The storage chamber is repositioned from the upper area to the lower area of the housing, utilizing the previously underutilized lower space. This spatial reconfiguration reduces the overall length and external dimensions of the housing while maintaining assembly capability, directly resolving the contradiction between ease of manufacture and compact dimensions.
2Reliability
If long, thin bores are used for high-pressure fuel supply, then fuel can be delivered to the nozzle, but production costs increase
Solution Approach 1:
The high-pressure fuel bores are reconfigured from long, thin vertical passages to shorter, wider passages utilizing the lower housing area. This dimensional change maintains adequate fuel delivery capability while significantly reducing manufacturing complexity and cost, as shorter bores require less precise machining and are easier to produce.
3Adaptability or versatility
If the actuator arrangement is positioned off-axis, then freedom in high-pressure fuel supply connection placement is improved, but alignment of the control passage with the actuator axis becomes more difficult
Solution Approach 1:
An intermediary alignment mechanism is introduced between the off-axis actuator arrangement and the control passage. This intermediary component facilitates precise alignment of the control passage with the actuator axis while maintaining the off-axis positioning benefits for fuel supply connection flexibility, thereby resolving the contradiction between adaptability and manufacturing precision.
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
The design results in a more affordable, compact, and efficient fuel injection system with greater freedom in high-pressure fuel supply connection placement, reduced complexity in manufacturing, and improved integration of functional elements, enhancing the overall design simplicity and effectiveness.
Implementation Method 1
A hydraulic control device for the needle-shaped injection valve member is located in the nozzle body
Implementation Method 2
A high-pressure supply bore, which is located closer to the nozzle body than the upper end of the housing body, opens into a longitudinal bore
Implementation Method 3
A hydraulic control device for the needle-shaped injection valve member is located in the nozzle body
Data Source
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AI summary
The fuel injection valve has an actuator arrangement with an actuating shaft (86), the counter-stop of which interacts with a stop (98) to limit the stroke (H) of the pilot valve element (82) of a pilot valve. An intermediate plate (12) is provided between the nozzle body (14) and the housing body (10), and the stop (98) is formed on the intermediate plate (12) or on a flat stop disc arranged thereon.