Spool-Type Selector Valve Tapered Face Machining
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Solution Overview
Problem
The existing 5-port selector valve requires labor-intensive machining of tapered faces in the valve hole, increasing manufacturing costs and complexity, and struggles with smooth seal member riding onto valve seats.
Innovation Solution
Forming tapered faces with a gradually reduced diameter on valve-seat ends where the seal member rides from low to high fluid pressure, with cylindrical faces on the opposite ends, and maintaining an inner diameter that increases from the center to the ends, improving moldability and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tapered faces are formed on both sides of the valve hole by inserting tools through end portions, then the seal member can ride smoothly onto the valve seat, but the machining process becomes labor-intensive and increases manufacturing cost
Solution Approach 1:
The patent merges the formation of both tapered faces into a single machining operation by drilling through one end portion of the valve hole. The tool creates both tapered faces simultaneously by passing through the valve hole, eliminating the need for separate machining operations at both ends. This reduces manufacturing complexity while maintaining the smooth riding surface for the seal member.
Solution Approach 2:
Instead of forming tapered faces by inserting tools from both end portions (conventional approach), the patent inverts the approach by drilling through one end portion to create both tapered faces. This reverse methodology simplifies the machining process by reducing the number of tool insertions and operations required.
2Ease of manufacture
If the valve hole diameter is gradually increased from center to both end sides, then moldability and workability of the valve body are improved, but the traditional machining method requires complex tool insertion from both sides
Solution Approach 1:
The patent combines the creation of both tapered faces into a single drilling operation through one end portion. This merged approach simplifies the machining process and reduces device complexity, while the resulting gradual diameter increase from center to ends maintains improved moldability and workability of the valve body.
3Ease of operation
If tapered faces are formed on both sides, then seal member riding is smoothed, but time and skills for machining increase
Solution Approach 1:
The patent merges the formation of both tapered faces into a single machining operation, reducing the number of tool insertions and machining steps. This significantly reduces machining time and the skill level required, while still providing the smooth tapered surfaces that enable easy seal member riding.
Solution Approach 2:
The patent inverts the conventional machining approach by drilling through one end portion rather than inserting tools from both ends. This reverse methodology reduces machining time and operational complexity while maintaining the functional benefit of smooth seal member riding on the tapered faces.
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
This configuration ensures smooth seal member riding onto valve seats with compressive force, enhancing the seal's functionality and simplifying the manufacturing process by reducing machining complexity and costs.
Implementation Method 1
a tapered face whose hole diameter is gradually reduced toward a direction of riding-on of the seal member is formed at a valve-seat end on which the seal member slides and rides from a side with a low fluid pressure to a side with a high fluid pressure
Data Source
AI summary
A tapered face whose hole diameter is gradually reduced toward a riding-on direction is formed at a valve-seat end of a supply valve seat or an discharge valve seat where a seal member of a spool slides and rides onto from a side with a low fluid pressure to a side with a high fluid pressure, while the other valve-seat end is kept as a cylindrical surface with a constant hole diameter, by which two tapered faces are formed in a valve hole, and an inner diameter of a portion located between the two tapered faces of the valve hole is formed equal to an inner diameter of a small diameter end of the tapered face, while an inner diameter of a portion located on a hole end side rather than the two tapered faces of the valve hole is formed equal to or larger than the inner diameter of a large diameter end of the tapered face.