Fluid Damper Assembly With Fingered Edge for Pulsation Damping
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Solution Overview
Problem
Existing fluid dampers in fuel injection and pressurized lubrication systems face challenges in efficiently damping pressure pulsations while maintaining a robust and precise assembly without additional components for restraint, and are susceptible to heat exposure that can affect performance.
Innovation Solution
A two-piece fluid damper design with a flexible damping device constrained by a peripheral edge to a body, featuring a segmented terminal edge with fingers and a ledge surface to pinch and retain the damping device, ensuring a hermetic seal and precise assembly without additional retainers, while limiting heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damping device is constrained using additional retainers or fasteners, then the restraint reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines the restraint function with the body structure itself by integrating the terminal edge fingers directly into the body. This eliminates the need for separate retainers or fasteners, as the body's terminal edge is designed to directly engage and restrain the damping device through its fingers, merging the structural and restraining functions into a single integrated component.
Solution Approach 2:
The body structure serves its own restraint function through the terminal edge fingers that are part of the body itself. The fingers are designed to automatically engage with the damping device upon assembly, allowing the body to restrain the damping device without requiring external restraint components, thus making the system self-sufficient.
2Ease of manufacture
If the terminal edge is made as a single piece, then the manufacturing simplicity is improved, but the assembly precision and restraint reliability deteriorate
Solution Approach 1:
The terminal edge is segmented into multiple fingers that are integrated into the body structure. This segmentation allows each finger to independently engage with the damping device, providing precise positioning and restraint. The segmented design enables better tolerance compensation and more accurate assembly compared to a single-piece terminal edge, while still being manufacturable as an integrated body component.
3Temperature
If the damping device is exposed to heat from the fluid chamber, then the heat transfer is improved for cooling, but the damping device performance deteriorates due to excessive heat
Solution Approach 1:
The terminal edge is divided into multiple fingers with spaces between them. This segmentation creates thermal barriers that limit heat transfer from the fluid chamber to the damping device. The gaps between fingers act as thermal insulation, allowing the damping device to remain cooler while still maintaining its restraining function, thus protecting the damping device material properties from degradation due to excessive heat.
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 effectively dampens pressure pulsations, maintains precise assembly, and protects the damping device from excessive heat, enhancing performance and reliability.
Implementation Method 1
the terminal edge being segmented into a plurality of fingers that cooperate with a ledge surface of the first cover to pinch the peripheral edge of the damping device
Implementation Method 2
a damping device arranged inside the fluid chamber, the damping device being constrained by a peripheral edge thereof to the body
Data Source
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AI summary
A fluid damper includes a body defining a fluid chamber and a first opening. The body is formed by a first cover and a second cover joined along an axial direction. A damping device is suspended inside the fluid chamber to damp pressure pulsations. The damping device is constrained by a peripheral edge. The damping device divides the fluid chamber into first and second sub-chambers. The first cover has a first wall portion into which a second wall portion of the second cover is received. A hermetic seal is formed between the first and second wall portions. The second cover has a terminal edge lying within the first wall portion of the first cover, the terminal edge being segmented into a plurality of fingers that cooperate with a ledge surface of the first cover to pinch the peripheral edge of the damping device.