Fuel Pump Valve Housing That Restricts Cross-Axis Valve Displacement
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Solution Overview
Problem
The conventional high-pressure fuel supply pump valve mechanism lacks a restriction member to control the displacement of the valve element across the stroke axis, leading to inconsistent contact positions during valve closure, resulting in violent displacement and potential wear and reduced airtightness.
Innovation Solution
Incorporating a valve holding portion within the valve housing to restrict the displacement of the discharge valve member in the crossing direction, ensuring consistent alignment and stable operation by encasing the discharge valve member, thereby preventing violent displacement and maintaining airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no restriction member is provided for the valve element, then the valve mechanism structure is simple, but the valve element experiences violent displacement in the crossing direction causing inconsistent contact position and reduced reliability
Solution Approach 1:
A restriction member is introduced as an intermediary component between the valve element and the valve housing. This restriction member guides the valve element's movement and limits its displacement in the crossing direction, ensuring consistent contact position during valve closure while maintaining structural simplicity
Solution Approach 2:
The valve housing is segmented to include a dedicated restriction member that is integrally formed with the housing. This segmentation allows the restriction function to be built into the housing structure itself, adding minimal complexity while effectively controlling valve element displacement
2Manufacturing precision
If the valve element is allowed free movement, then the valve mechanism is easier to manufacture, but the contact position during valve closure becomes inconstant leading to wear and reduced airtightness
Solution Approach 1:
The restriction member is pre-formed as an integral part of the valve housing during the housing manufacturing process. This preliminary action ensures that the restriction geometry is precisely formed, guaranteeing consistent valve element guidance and contact position without requiring additional assembly steps
Solution Approach 2:
The restriction member is merged with the valve housing structure, forming a single integrated component. This merging eliminates the need for separate assembly of the restriction member, maintaining ease of manufacture while ensuring precise contact position consistency through the integrated 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 effectively suppresses violent displacement of the valve element, ensuring consistent contact and reduced wear, thereby maintaining airtightness and the residual pressure capability of the high-pressure fuel supply pump.
Implementation Method 1
a valve spring (8d) that biases the discharge valve member (8b) in the closing direction
Data Source
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AI summary
An object of the present invention is to provide a valve mechanism for suppressing violent displacement of a valve in a direction of crossing a stroke axis when a valve is opened and closed, and a high-pressure fuel supply pump including the same. The valve mechanism of the present invention includes a seat member having a seat surface, and a valve for contacting the seat surface. The valve mechanism includes a valve housing for accommodating the seat member and the valve, and the valve housing is formed in a shape of restricting displacement of the valve in a crossing direction crossing an opening and closing direction of the valve.