PCV Reflux Valve Flow Path for Low-Negative-Pressure Blowby Return
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Solution Overview
Problem
Existing reflux valves in internal combustion engines have a low blowby gas reflux flow rate when negative pressure on the intake side is small, limiting their effectiveness in promoting active reflux of blowby gas, and increasing the valve size to enhance flow rate is not feasible due to layout restrictions.
Innovation Solution
A reflux valve design featuring a housing with a through hole and a movable valve body biased by a member, which includes specific openings and support structures to optimize the flow path and ensure a high reflux flow rate without increasing the valve size, utilizing multiple holes to maintain a consistent and adjustable flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the opening area between the inner circumference of the valve case and the outer circumference of the valve body is increased to increase the reflux flow rate, then the flow rate for causing blowby gas to reflux increases, but the entire PCV valve becomes larger which restricts engine layout
Solution Approach 1:
The valve body is divided into multiple segments with through-holes arranged in different axial positions. Instead of using a single large opening, the invention segments the flow path into multiple smaller holes (first through-holes and second through-holes) distributed along the axial direction. This segmentation allows the total effective opening area to be increased while maintaining a compact valve outer diameter, thus resolving the contradiction between reflux flow rate and valve size.
2Quantity of substance
If the diameter of the flow path is widened to increase the opening area, then the flow rate for causing blowby gas to reflux increases, but the entire PCV valve becomes larger
Solution Approach 1:
The invention transitions from increasing flow path diameter (radial dimension) to increasing the number of through-holes and their axial distribution (axial dimension). Instead of widening the flow path in the radial direction which would increase valve diameter, the solution places multiple through-holes at different axial positions, effectively utilizing the axial dimension to increase total opening area while keeping the valve compact in radial direction.
3Productivity
If a single large opening is used to increase reflux flow rate, then the flow rate increases, but the valve size and complexity increase
Solution Approach 1:
The valve body is divided into multiple segments with through-holes arranged in different axial positions. Instead of using a single large opening, the invention segments the flow path into multiple smaller holes (first through-holes and second through-holes) distributed along the axial direction. This segmentation allows the total effective opening area to be increased while maintaining a compact valve outer diameter, thus resolving the contradiction between reflux flow rate and valve size.
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 enables a large amount of blowby gas to actively reflux even at low negative pressure conditions without enlarging the valve, ensuring stable and efficient gas reflux in internal combustion engines.
Implementation Method 1
a biasing member that biases the valve body to one side in the axial direction
Implementation Method 2
when the valve body moves to the other side in the axial direction against a biasing force of the biasing member due to negative pressure applied to the downstream side relative to the upstream side
Data Source
AI summary
A reflux valve includes a first supported portion that plugs a first opening when a valve body biased by a biasing member moves to one side in an axial direction, the first supported portion opens the first opening when the valve body moves to the other side in the axial direction against a biasing force of the biasing member due to negative pressure applied to a downstream side relative to an upstream side, the valve body includes a first hole extending from an end on the other side in the axial direction to one side in the axial direction, a valve body portion includes a second hole extending from an outer side in a radial direction and reaching the first hole, and the valve body portion includes a third hole at a different position from the second hole in the axial direction.