Cylinder Phaser Valve Synchronization
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Solution Overview
Problem
Hydraulic cylinders operating in parallel often become out of phase due to differences in leakage and cylinder dimensions, leading to undesirable deformation stresses and tilting of equipment, such as cranes, when outriggers are not synchronized.
Innovation Solution
A phaser valve is introduced that allows communication between the blind and rod ends of a cylinder only when the piston approaches one end of its travel, enabling synchronization of parallel cylinders and reducing vibration and noise by slowing piston speed at the end of its stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallel hydraulic cylinders operate without phase synchronization, then cylinder position differences accrue over time leading to deformation stresses and equipment tilting, but installing phase synchronization valves increases device complexity
Solution Approach 1:
The patent combines multiple valve functions (phase synchronization, end-of-stroke detection, and communication control) into a single integrated valve assembly. The valve body incorporates both a phase synchronization valve and an end-of-stroke valve, eliminating the need for separate synchronization mechanisms and reducing overall system complexity while maintaining reliable cylinder position synchronization.
Solution Approach 2:
The valve assembly performs multiple functions simultaneously: it detects end-of-stroke conditions, synchronizes parallel cylinder phases, and controls fluid communication between cylinder ends. This multi-functional design replaces what would traditionally require multiple separate components, achieving reliable synchronization without proportionally increasing device complexity.
2Manufacturing precision
If the phaser valve allows communication between blind end and rod end only at the end of stroke, then cylinder synchronization is achieved, but the valve must be precisely timed which increases manufacturing precision requirements
Solution Approach 1:
The end-of-stroke valve automatically detects when the piston reaches the end of its stroke through mechanical contact (the piston rod contacting the valve stem) and autonomously opens the communication passage. This self-actuating mechanism eliminates the need for external timing control systems, sensors, or complex timing mechanisms, achieving reliable synchronization while minimizing manufacturing precision requirements for timing adjustments.
Solution Approach 2:
The patent replaces potential complex timing control systems (electronic sensors, actuators, and control circuits) with a simple mechanical end-of-stroke detection mechanism. The physical contact between the piston rod and valve stem directly triggers the valve opening, providing robust synchronization accuracy without requiring high-precision timing manufacturing or adjustment capabilities.
3Volume of stationary object
If the valve occupies minimal space, then the compact design is achieved, but the flow capacity may be reduced
Solution Approach 1:
The valve design utilizes three-dimensional flow passages and optimized internal geometry to maximize flow capacity within a compact volume. By strategically shaping the communication passage and utilizing vertical space within the valve body, the design achieves adequate fluid flow capacity without increasing the valve's horizontal footprint, thus maintaining system compactness while ensuring sufficient hydraulic flow for effective cylinder synchronization.
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 phaser valve effectively synchronizes the position of multiple cylinders, reduces vibration and noise, and prolongs the lifespan of the cylinder assembly by minimizing impact and deformation stresses.
Implementation Method 1
the valve is opened to allow communication between the blind end and the rod end. Therefore, while the valve is opened, translational motion of the piston within the cylinder bore is stopped or slowed, as oil is discharged from the pressurized end of the cylinder, across the piston, and out of the depressurized end of the cylinder.
Implementation Method 2
Differential pressure across the piston is responsible for movement of the rod of the cylinder. Any communication between the blind and rod ends will tend to lessen or eliminate this pressure differential.
Data Source
AI summary
A phaser valve for a piston and cylinder assembly helps to keep a pair of pistons in phase with each other. The phaser valve includes a poppet which is slidable between opposing seats of a valve housing. The poppet includes a head and a stem, both the head and the stem having concave portions which facilitate the flow of hydraulic fluid across the valve. The poppet head has two generally conical ends, so that the head makes a fluid-tight seal with a seat when the head is urged towards either seat. Due to its construction, the phaser valve may be built to fit within a very small space, while still allowing a substantial flow of fluid when the head is not in abutment with one of the seats.