High-Pressure Fuel Pump Damper Structure for Compact Pulsation Reduction
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Solution Overview
Problem
Conventional high-pressure fuel supply pumps with integrated damper mechanisms for low-pressure pulsation reduction require larger external diameters and increased total height due to the cup-shaped cover, leading to a bulky design.
Innovation Solution
A tubular part is formed on the inner circumference of the damper housing to engage with the outer edge of a flat plate-shaped cover, reducing the overall height and radial dimensions of the damper mechanism, allowing for a smaller-sized high-pressure fuel supply pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cup-shaped cover is used for the damper mechanism, then the structural integrity and sealing are improved, but the total height and external diameter of the pump increase
Solution Approach 1:
The cover shape is changed from a three-dimensional cup shape to a two-dimensional flat plate shape. This dimensional reduction eliminates the height component of the cover, allowing the damper mechanism to be integrated into the pump housing without increasing the total height or external diameter of the pump, while the tubular part provides the necessary structural support.
2Device complexity
If the damper mechanism is integrally attached to the high-pressure fuel supply pump, then the assembly is simplified, but the pump body size increases due to the cup-shaped cover
Solution Approach 1:
The damper mechanism is integrally formed with the pump housing as a single component. The flat plate-shaped cover is directly integrated into the pump housing structure, eliminating the need for separate assembly steps and reducing the overall pump body size compared to using a cup-shaped cover that would require additional space.
3Volume of moving object
If a flat plate-shaped cover is used instead of a cup-shaped cover, then the total height and external diameter are reduced, but the sealing effectiveness may be compromised
Solution Approach 1:
A tubular part is introduced as an intermediary component between the flat plate-shaped cover and the low-pressure fuel chamber. This tubular part provides the necessary sealing surface and structural support that would otherwise be provided by the cup-shaped cover, ensuring sealing effectiveness while maintaining the compact flat plate 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
The solution enables a compact low-pressure pulsation reducing mechanism and a smaller high-pressure fuel supply pump, reducing vibration susceptibility and simplifying the welding process, while maintaining effective pulsation reduction.
Implementation Method 1
A tubular part for engaging with the outer edge of a cover is formed on the inner circumference of an open end part of a low-pressure fuel chamber
Implementation Method 2
a damper mechanism as a low-pressure pulsation reducing mechanism which is attached to a low-pressure fuel path
Data Source
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AI summary
A damper mechanism used for a high-pressure fuel supply pump system has a problem in that its total height is high and its external diameter is also large. In cases where the damper mechanism is integrally attached to the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump becomes high and the external diameter of the pump also becomes large. The damper mechanism of the present invention is configured so that an outer circumferential surface of a cover in regard to the thickness direction of the base material of the cover engages with the inner circumference of an open end part of a bottomed tubular concave part formed in a damper housing or in a pump housing of the high-pressure fuel supply pump. With this configuration, the total height of the damper as a low-pressure pulsation reducing mechanism can be reduced and the dimensions of the damper in the radial directions can also be reduced. In cases where the damper mechanism is formed integrally with the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump can be reduced, the dimensions of the damper part in the radial directions can also be reduced, and a high-pressure fuel supply pump in a small body size can be provided.