Fuel Pump Valve Seat Segmentation for Sealing
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Solution Overview
Problem
Existing fuel pumps in direct injection engines face challenges in maintaining sealing properties, especially under increased fuel pressure, due to deformation of the valve seat during fixing, which affects the flatness of the abutting surface and compromises sealing efficiency.
Innovation Solution
A fuel pump design featuring a valve seat with a fixing portion, an abutting portion, and a constricted portion, where the fixing portion is inserted into a hole in the body and fixed by caulking, preventing external forces from deforming the abutting portion and maintaining surface flatness, thus enhancing sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the valve seat is press-fitted or joined by caulking to the body, then the valve seat is securely fixed to the body, but the abutting surface may deform and sealing property degrades
Solution Approach 1:
The valve seat is divided into three distinct portions: a fixing portion for secure attachment to the body, an abutting portion for maintaining sealing contact with the valve body, and a constricted portion connecting them. This segmentation allows each portion to perform its specific function independently, preventing deformation transmission from the fixing operation to the sealing surface.
Solution Approach 2:
Different portions of the valve seat are designed with different structural characteristics. The fixing portion is designed for strong mechanical attachment, the abutting portion is designed with a flat, deformation-resistant surface for sealing, and the constricted portion provides structural transition. This local differentiation ensures optimal performance for each function while preventing the harmful effects of one portion from affecting another.
2Productivity
If fuel pressure is increased to improve fuel economy and reduce particulate matter, then engine performance improves, but sealing requirements become more stringent and harder to maintain
Solution Approach 1:
By segmenting the valve seat into distinct functional portions, the design enables the abutting portion to maintain its flatness and sealing capability even under high fuel pressure conditions, thereby supporting improved fuel economy requirements without compromising sealing reliability.
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 prevents deformation of the abutting surface, maintaining sealing efficiency even under high external forces, thereby improving the closure sealing property of the fuel flow path in the fuel pump.
Implementation Method 1
due to elastic deformation or the like of the constricted portion, it is possible to prevent the external force from being transmitted to the abutting portion
Implementation Method 2
the fixing portion is inserted into a hole portion provided in the body in the axial direction
Data Source
AI summary
A valve seat has a fixing portion fixed to the body, an abutting portion where the suction valve body abuts, and a constricted portion which is provided between the fixing portion and the abutting portion and has rigidity lower than that of the fixing portion and the abutting portion.