Fuel Pump Damper Cover 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 in the damper mechanism, then the cover provides sufficient structural strength, but the total height and external diameter of the damper mechanism increase
Solution Approach 1:
The patent transitions from a three-dimensional cup-shaped cover to a two-dimensional flat plate-shaped cover. This dimensional reduction eliminates the height component of the cover, allowing the damper mechanism to achieve sufficient strength through planar geometry and edge engagement while significantly reducing the total height and external diameter of the mechanism.
Solution Approach 2:
The invention extracts the essential functional requirements of the cover (sealing and structural support) from the cup-shaped form and implements them through a flat plate with a tubular engagement feature. This extraction allows the cover to provide necessary strength through the tubular part's engagement with the housing rather than relying on the volumetric strength of a cup shape.
2Device complexity
If the damper mechanism is integrally attached to the high-pressure fuel supply pump, then the pump structure is simplified, but the total height and external diameter of the pump increase
Solution Approach 1:
By reducing the damper mechanism to a flat plate configuration, the integral attachment to the pump does not add significant height or radial dimensions. The tubular part engages with the pump housing in a manner that maintains compact overall dimensions while achieving structural integration.
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 of the damper mechanism are reduced, but the structural strength may be compromised
Solution Approach 1:
The flat plate cover is segmented into a main plate portion and an integrated tubular part. This segmentation allows the structure to distribute loads effectively - the main plate provides sealing surface area while the tubular part provides structural rigidity and engagement strength with the pump housing, achieving adequate strength without cup-shaped volume.
Solution Approach 2:
The flat plate cover is formed as a composite structure combining a flat plate base with an integrated tubular engagement feature. This composite configuration provides both the sealing function of a flat surface and the structural strength of a tubular element, achieving adequate strength-to-size ratio without requiring cup-shaped geometry.
Data Source
AI summary
The damper mechanism used for a high-pressure fuel supply pump 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. 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 and the dimensions of the damper part in the radial directions can also be reduced.