Fuel Rail Damper Axial Positioning via Biasing Support
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Solution Overview
Problem
Conventional fuel rail dampers for internal combustion engines are complex, costly, and prone to axial movement due to manufacturing tolerances, leading to unsatisfactory performance in damping pressure pulsations.
Innovation Solution
A fuel rail assembly with a fuel rail damper support that includes an attachment section for fixing the damper and a biasing section to prevent axial movement, ensuring proper positioning and stability within the fuel rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positioning features are used in fuel rail dampers, then the damper can be positioned within the fuel rail, but the structure becomes complex and costly to manufacture
Solution Approach 1:
The positioning structure is divided into separate functional elements: a positioning feature on the fuel rail damper and a corresponding positioning recess in the fuel rail. This segmentation allows each component to be manufactured independently with simpler processes while maintaining reliable positioning when assembled.
Solution Approach 2:
The positioning function is extracted from the main body of the fuel rail damper and implemented as a distinct positioning feature. This separation allows the positioning mechanism to be optimized independently from the damping function, reducing overall complexity.
2Reliability
If conventional positioning features are used in fuel rail dampers, then the damper can be positioned within the fuel rail, but manufacturing costs increase
Solution Approach 1:
The positioning features are designed as simple, inexpensive geometric elements that can be manufactured using basic machining or molding processes. These simple positioning features replace complex, costly positioning mechanisms while maintaining adequate positioning stability throughout the service life of the damper.
3Reliability
If conventional positioning features are used in fuel rail dampers, then the damper can be positioned within the fuel rail, but axial movement occurs over manufacturing tolerances
Solution Approach 1:
The positioning system incorporates a biasing mechanism that dynamically adjusts the axial position of the damper within the fuel rail. The biasing force compensates for variations in manufacturing tolerances, maintaining consistent positioning despite tolerances in the positioning features or rail dimensions.
Solution Approach 2:
The biasing mechanism changes the operational parameters of the positioning system by applying a controlled force that adjusts the axial position of the damper. This active parameter adjustment compensates for passive manufacturing tolerances in the positioning features.
4Reliability
If the fuel rail damper is positioned within the fuel rail, then pressure pulsations can be damped, but the damper may move axially over manufacturing tolerances
Solution Approach 1:
The biasing mechanism pre-positions the damper axially within the fuel rail before operation begins. This preliminary positioning action ensures that the damper starts in the correct position and maintains stability during operation, compensating for manufacturing tolerances in advance.
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 solution effectively minimizes axial movement and enhances the stability of the fuel rail damper, improving fuel distribution and reducing pressure pulsation amplitude, thus enhancing the performance and manufacturing efficiency of the fuel rail assembly.
Implementation Method 1
a biasing section that applies a biasing force to the first end cap to urge the fuel rail damper away from the first end cap and to prevent movement of the fuel rail damper along the fuel rail damper axis within the fuel rail
Implementation Method 2
One or more walls of the fuel rail damper flex in response to rapid pressure pulsations within the fuel rail. The flexing of the one or more walls of the fuel rail damper adsorbs energy from the pressure pulsation to thereby reduce the speed of the pressure wave and the amplitude of the pressure pulsation/spike
Implementation Method 3
The flexing of the one or more walls of the fuel rail damper adsorbs energy from the pressure pulsation to thereby reduce the speed of the pressure wave and the amplitude of the pressure pulsation/spike
Data Source
AI summary
A fuel rail assembly includes a hollow fuel rail extending along a fuel rail axis and includes at least one outlet for dispensing fuel from the fuel rail. A fuel rail damper is disposed within the fuel rail and extends along a fuel rail axis from a first fuel rail damper end to a second fuel rail damper end for damping pressure pulsations within the fuel rail. A fuel rail damper support is included for positioning the fuel rail damper within the fuel rail. The fuel rail damper support includes an attachment section for fixing the fuel rail damper support to the fuel rail damper and a biasing section that applies a biasing force to prevent axial movement of the fuel rail damper within the fuel rail.