Adjustable Shock Absorber Pilot Valve Damping Against Chatter
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Solution Overview
Problem
Conventional damping force adjustable shock absorbers experience self-induced vibrations and noise due to increased hydraulic fluid flow rates, leading to chattering issues.
Innovation Solution
Incorporation of a first orifice between the valve body back-pressure chamber and the valve body, allowing hydraulic liquid to transfer between the pilot chamber and the valve body back-pressure chamber via the orifice, which generates damping to restrain self-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the flow rate of hydraulic liquid flowing out of the pilot chamber is increased, then the damping force adjustment responsiveness is improved, but self-induced vibrations (chattering) of the pilot valve occur causing noise
Solution Approach 1:
A first orifice is introduced as an intermediary element between the pilot chamber and the valve body back-pressure chamber. This orifice mediates the hydraulic liquid flow, allowing pressure equalization while restraining self-induced vibrations of the pilot valve through controlled flow resistance, thereby reducing noise without sacrificing responsiveness
2Device complexity
If a conventional damping valve structure is used, then the structure is simple, but air accumulation occurs in the valve body back-pressure chamber causing spongy brake pedal and reduced responsiveness
Solution Approach 1:
The first orifice acts as an intermediary flow path that prevents air accumulation in the valve body back-pressure chamber by enabling continuous hydraulic liquid circulation. This simple orifice structure maintains reliability and responsiveness without requiring complex additional components
Solution Approach 2:
The invention utilizes hydraulic principles by introducing a controlled flow path through the first orifice that ensures proper hydraulic liquid circulation and pressure distribution. This hydraulic design prevents air entrapment and maintains firm brake pedal feel through proper fluid dynamics management
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 reduces self-induced vibrations and noise by maintaining pressure balance and preventing air accumulation, enhancing the responsiveness and stability of the damping force adjustable shock absorber.
Implementation Method 1
a first orifice is provided between the valve body back-pressure chamber and the valve body... allowing hydraulic liquid to transfer between the pilot chamber and the valve body back-pressure chamber via the orifice, which generates damping to restrain self-induced vibrations
Implementation Method 2
a plunger in which the shaft portion is inserted, the plunger being configured to generate thrust force biasing the valve body toward the seat surface side in response to energization of a coil
Data Source
AI summary
When a pilot valve is actuated, and an actuating rod to which a valve body is fixed moves in an axial direction, hydraulic liquid of an equivalent amount to a volume of a portion of the actuating rod which enters and retracts from a valve body back-pressure chamber moves between a pilot chamber and the valve body back-pressure chamber through an orifice (volume compensation). At this time, the damping that is generated by the hydraulic liquid passing through the orifice acts on the valve body, which restrains self-induced vibrations (chattering) of the pilot valve.