Shock Absorber Valve Assembly Frequency Pressure Control
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Solution Overview
Problem
Conventional shock absorbers fail to effectively control attenuation force across varying frequency regions and speed changes, leading to inadequate vibration absorption during high-frequency shocks and loss of attenuation force during high-speed operations, which degrades ride comfort and handling stability.
Innovation Solution
A valve assembly for shock absorbers incorporating a pressure sensitive main valve unit, a sub-valve unit, and a frequency sensitive valve unit, which blocks the side fluid channel during high-speed operations to increase attenuation force and prevent spring friction noise, allowing for adaptive control of attenuation force based on pressure and frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shock absorber uses a single pressure difference mechanism between extension and compression chambers, then it can smoothly absorb low-frequency vibration with large amplitude, but it fails to generate sufficient attenuation force for high-frequency vibration with small amplitude
Solution Approach 1:
The shock absorber is divided into multiple functional valve units: a main valve unit for pressure control, a frequency sensitive valve unit for frequency-based attenuation, and a sub-valve unit for additional pressure control. Each unit handles different frequency regions and pressure conditions independently, allowing the system to effectively address both low-frequency and high-frequency vibrations across various operating conditions.
2Ease of operation
If the shock absorber allows fluid to flow through a bypass channel during high-speed operation, then it maintains smooth operation, but it loses attenuation force when instantaneous large amplitude shock is applied
Solution Approach 1:
The sub-valve unit dynamically responds to pressure changes during high-speed operation. When instantaneous large amplitude shock occurs, the pressure increase activates the sub-valve unit to close the bypass fluid channel, redirecting fluid flow through the main valve unit to generate maximum attenuation force. During normal high-speed operation, the bypass channel remains open for smooth operation, creating a dynamic adaptation to operating conditions.
3Reliability
If the shock absorber increases attenuation force for high-speed operation, then it improves handling stability, but it transfers more vibration to the vehicle body during normal driving
Solution Approach 1:
The system changes operational parameters based on operating conditions. During normal driving, the frequency sensitive valve unit allows fluid to pass through its fluid channel, providing a softer attenuation characteristic that improves ride comfort. During high-speed operation with instantaneous shock, the sub-valve unit closes the bypass channel and the main valve unit increases attenuation force, prioritizing handling stability. This parameter adaptation resolves the contradiction between comfort and 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 valve assembly enhances ride comfort and handling stability by effectively varying attenuation force according to pressure and frequency, preventing fluid loss and noise, thereby improving vehicle behavior and emotional quality.
Implementation Method 1
the hydraulic fluid flows from the extension chamber C1 to the compression chamber C2 or from the compression chamber C2 to the extension chamber C1 through an orifice (not shown) formed in the piston valve 4, thereby generating an attenuation force
Implementation Method 2
When the piston valve 4 reciprocates up and down within the cylinder 2, the hydraulic fluid flows from the extension chamber C1 to the compression chamber C2 or from the compression chamber C2 to the extension chamber C1
Data Source
AI summary
A valve assembly of a shock absorber can achieve both an effect of varying an attenuation force according to a frequency region of vibration or shock transferred to the shock absorber during the driving of an automobile and an effect of varying an attenuation force according to an additional pressure and can increase the attenuation force in response to an instantaneous input of a large amplitude behavior. The valve assembly includes: a valve housing coupled to a piston rod having an orifice hole and a space formed therein, the space having an open lower end to communicate with the orifice hole; a frequency sensitive valve unit including a free piston configured to vertically partition the space; and a sub-valve unit coupled to the lower end of the space, wherein operation of the sub-valve unit is controlled by ascending and descending of the free piston.