Three-Way Hydraulic Valve Floating Bushing Misalignment
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Solution Overview
Problem
Conventional hydraulic valves require costly threading and precise concentricity to prevent leakage, which increases manufacturing costs and is sensitive to component misalignments, making them prone to leakage if misaligned.
Innovation Solution
A three-way hydraulic valve design featuring a floating bushing that compensates for misalignments and eliminates the need for threading, using retention O-rings with specific geometries to retain internal components within external components, allowing for easier assembly and maintenance while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threading is used to retain the bushing inside the sleeve, then the bushing is securely retained, but manufacturing cost increases and the valve becomes sensitive to misalignments
Solution Approach 1:
The patent removes the threading feature from the bushing-sleeve connection, extracting the problematic element that caused both high manufacturing costs and sensitivity to misalignments. Instead, a simple snap-fit retention mechanism is used where the bushing has an outer diameter that engages with an inner diameter of the sleeve without threads, eliminating the need for precise threading while maintaining secure retention.
Solution Approach 2:
Instead of using threads to create a secure connection (which adds complexity and cost), the patent inverts the approach by using a simple diameter-based engagement where the bushing's outer diameter directly engages the sleeve's inner diameter. This reversal of the connection method eliminates threading while maintaining retention security.
2Reliability
If precise concentricity is maintained between bushing, sleeve, and housing, then leakage is prevented, but manufacturing cost increases
Solution Approach 1:
The patent changes the geometric parameters of the bushing-sleeve-housing interface by eliminating threads and using simple diameter-based engagement. This parameter change allows for larger tolerance ranges while maintaining effective sealing, as the seal is achieved through the poppet-bushing interface rather than requiring precise concentricity of all components.
Solution Approach 2:
The patent extracts the requirement for precise concentricity by removing the threaded connection that demanded such precision. The simplified diameter-based engagement allows components to be manufactured with standard tolerances while still preventing leakage through the poppet seal mechanism.
3Stability of the object's composition
If threaded retention is used, then the bushing is fixed in position, but the valve becomes sensitive to torque and misalignments
Solution Approach 1:
The patent removes the threaded connection that created torque sensitivity. By using a simple snap-fit where the bushing's outer diameter engages the sleeve's inner diameter, the connection becomes insensitive to torque while maintaining positional stability during operation.
Solution Approach 2:
The patent introduces a degree of dynamic adjustment by allowing the floating bushing to self-align within the sleeve. The bushing can move slightly to accommodate misalignments while maintaining its functional position, making the system more tolerant of installation variations and operational torques.
4Reliability
If threading and precise concentricity are required, then leakage is prevented, but assembly and maintenance become difficult
Solution Approach 1:
The patent extracts the complex threading and precise concentricity requirements that made assembly difficult. The simplified diameter-based engagement allows components to be assembled by simple insertion and snap-fit retention, while maintenance becomes easier as components can be removed without thread damage risks.
Solution Approach 2:
Instead of requiring precise threading and concentricity for assembly (which complicates the process), the patent inverts to a simple diameter-based snap-fit approach. This reversal makes assembly straightforward while maintaining leakage prevention through the poppet-bushing seal interface.
Data Source
AI summary
An example valve includes: a housing having a first longitudinal cavity therein; a sleeve disposed, at least partially, in the first longitudinal cavity, where the sleeve has a second longitudinal cavity therein, and includes a first seat formed as a protrusion from an interior peripheral surface of the sleeve; a poppet mounted within the second longitudinal cavity and configured to move axially therein; and a bushing mounted, at least partially, in the second longitudinal cavity, such that the bushing is floating and is allowed to move axially in the second longitudinal cavity, where the bushing is hollow and defines a first port at a distal end of the bushing and defines a second seat at a proximal end of the bushing, and where the sleeve defines a second port and a third port disposed on an exterior peripheral surface of the sleeve.