Fuel Pump Check Valve Seat Structure for Press-Fit Sealing
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Solution Overview
Problem
The deformation of the seat member in the relief valve of a fuel pump due to press-fitting affects the sealing performance, compromising the reliability of the valve mechanism.
Innovation Solution
A check valve design with a seat member that includes a groove portion radially spaced from the inner surface, allowing for a press-fitting without deformation, maintaining the seat surface integrity and ensuring reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the seat member is press-fitted into the valve bore, then the seat member is securely fixed in position, but the seat member deforms and the seat surface shape is compromised
Solution Approach 1:
The seat member is divided into two distinct portions: a mounting portion for press-fitting into the valve bore and a seat portion forming the sealing surface. This segmentation allows the mounting portion to be deformed during press-fitting while the seat portion remains undeformed and maintains its precise shape, thereby securing the seat member in position without compromising seat surface precision
Solution Approach 2:
Different portions of the seat member are given different properties: the mounting portion is designed to be deformable for secure fixation, while the seat portion is designed to remain rigid and maintain its precise geometric shape. This local differentiation of properties allows simultaneous achievement of strong fixation and precise sealing surface
2Strength
If the seat member is press-fitted into the valve bore, then the seat member is securely fixed, but the reliability of the valve mechanism is compromised
Solution Approach 1:
By segmenting the seat member into mounting and seat portions, the invention ensures that deformation during installation is localized to the mounting portion only. The seat portion maintains its intended shape and sealing capability, thereby preserving the reliability of the valve mechanism while still achieving secure fixation
3Stability of the object's composition
If the seat portion is in contact with the inner surface of the valve bore, then the seat member is stable during installation, but the seat surface deforms under press-fitting
Solution Approach 1:
The seat member is segmented into a mounting portion that contacts the valve bore inner surface during installation and a seat portion that forms the sealing surface. The mounting portion provides stability during installation through contact with the valve bore, while the seat portion remains isolated from deformation forces, maintaining its precise shape
Solution Approach 2:
The mounting portion acts as an intermediary element between the seat portion and the valve bore. It absorbs the deformation and contact forces during press-fitting, protecting the seat portion from direct contact and deformation, thereby maintaining both installation stability and seat surface precision
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 maintains the intended shape of the seat surface, enhancing the sealing effect and mechanical stability of the valve, thereby improving the reliability of the fuel pump under high-pressure conditions.
Implementation Method 1
a mounting portion being press-fitted into the valve bore so that it engages the inner surface
Data Source
AI summary
A pump comprising a check valve, which check valve comprises:an axially extending valve bore defined within a pump body of the pump and having an inner surface,a seat member defining an axially extending valve channel and having a mounting portion being press-fitted into the valve bore so that it engages the inner surface and a seat portion disposed proximal with respect to the mounting portion, the seat portion defining a seat surface around a proximal opening of the valve channel, wherein a pilot radius, which is a maximum radius of the seat portion, is at least 95% but less than 100% of valve-bore radius of the valve bore so that the seat portion is out of contact with the inner surface, anda valve member movable with respect to the seat member and engaging the seat surface in a closed position.