Priority Flow Control Valve With Throttle Check Noise Suppression
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Solution Overview
Problem
Priority flow control valves in forklifts experience unwanted vibrations and noise due to spool displacement, leading to unstable hydraulic fluid flow and operator irritation from abnormal sounds when high pressure hydraulic oil is supplied.
Innovation Solution
Incorporating a throttle check valve with an opening member that separates the poppet valve body from the valve seat when the spool is at the second position, preventing hydraulic fluid from passing through the orifice and reducing noise, while maintaining stable operation and flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a throttle check valve is used to stabilize spool operation, then spool stability is improved, but abnormal sounds and vibrations are generated due to hydraulic fluid passing through the orifice
Solution Approach 1:
The opening member is positioned to preliminarily open the throttle check valve before the spool reaches positions where abnormal sounds would occur. This preliminary action prevents the hydraulic fluid from passing through the orifice in a manner that generates noise and vibration, while still maintaining the stabilizing effect of the throttle check valve on spool operation.
Solution Approach 2:
The opening member acts as an intermediary element that mediates between the spool position and the throttle check valve operation. By introducing this intermediate component, the system can control the valve opening state independently of the spool position, preventing abnormal sounds while maintaining spool stability.
2Productivity
If the spool is allowed to displace for flow control, then flow rate adjustment is achieved, but unwanted vibrations and noise occur
Solution Approach 1:
The opening member preliminarily opens the throttle check valve to prevent abnormal sounds before they occur, allowing the spool to displace for flow control without generating unwanted vibrations and noise.
3Object-generated harmful factors
If the throttle check valve is closed to prevent noise, then abnormal sounds are reduced, but spool operation stability is compromised
Solution Approach 1:
The opening member preliminarily opens the throttle check valve before the spool reaches positions that would cause abnormal sounds, ensuring the valve remains open during normal operation to prevent noise while maintaining spool stability through the damping chamber.
Solution Approach 2:
The opening member serves as an intermediary that ensures the throttle check valve remains open under normal operating conditions, preventing abnormal sounds while allowing the damping chamber to maintain spool operation stability.
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 abnormal sounds and maintains stable operation by ensuring the throttle check valve remains open when the spool is at the second position, preventing noise and ensuring consistent hydraulic fluid flow, thus enhancing the operational stability and reducing vibrations in forklifts.
Implementation Method 1
a spring that biases the spool from a first position at which the hydraulic fluid is guided from the high pressure port to the steering port and the loading/unloading port to a second position at which the hydraulic oil is guided from the high pressure port to the steering port
Implementation Method 2
a throttle check valve with which a flow path for the hydraulic fluid from the steering port to the damper chamber is throttled
Implementation Method 3
a damper chamber formed between the spool and a housing and a damping function is provided with a throttle check valve used, so that a stable operation of the spool is achieved
Data Source
AI summary
A throttle check valve includes: a poppet valve body that has an orifice formed at one end and has a hole portion formed at a side portion; a plug that has a tubular shape to surround the poppet valve body, and functions as a valve seat to come into contact with the poppet valve body; and a spring that biases the poppet valve body and the plug functioning as the valve seat in directions to come into contact with each other. When the spool is at the second position, the plug forming the distal end portion of the spool and the plug arranged in the housing come into contact with each other. The plug is provided with a protruding portion that comes into contact with the poppet valve body.