Shock Absorber Bypass Valve Structure for Mid-High Speed Damping
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Solution Overview
Problem
Conventional shock absorbers face challenges in adjusting damping force effectively at middle and high piston speeds, leading to discomfort and reduced ride comfort when mounted on vehicles, as existing adjustment methods either limit the range of damping force adjustment or cause abrupt changes in damping force characteristics.
Innovation Solution
A shock absorber configuration incorporating a hard-side damping element with an orifice and leaf valve, an electromagnetic valve to control a bypass passage, and a soft-side damping element with an orifice and leaf valve in series, allowing for adjustable damping coefficients across low and middle to high piston speeds, and a unidirectional check valve for extension stroke damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the valve opening pressure of the pilot valve is lowered to reduce the back pressure of the leaf valve, then the damping force in the middle and high speed range decreases (soft mode), but the inclination of the characteristic line rapidly changes when transitioning from low speed range to middle and high speed range, causing ride comfort deterioration
Solution Approach 1:
The damping element is divided into a first damping element (with orifice and first leaf valve) and a second damping element (with second orifice and second leaf valve). This segmentation allows independent control of damping characteristics at different speed ranges, enabling gentle transition between low speed and middle/high speed ranges while maintaining adjustable damping force in the middle and high speed range.
2Adaptability or versatility
If a needle valve is used to adjust the opening area of the bypass passage, then the damping force in the low speed range can be adjusted, but the adjustment range of damping force in the middle and high speed range is limited
Solution Approach 1:
The invention changes the control parameter from bypass passage opening area (needle valve) to leaf valve opening pressure (pilot valve). By adjusting the pilot valve's valve opening pressure, the back pressure of the leaf valve changes, which directly controls the damping force in the middle and high speed range where the leaf valve is open, thereby expanding the adjustment range.
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
This configuration enhances the adjustment range of damping force at middle and high piston speeds, providing improved ride comfort by smoothing the transition of damping force characteristics, thus reducing discomfort and enhancing vehicle ride quality.
Implementation Method 1
an electromagnetic valve capable of changing an opening area of a bypass passage that bypasses the hard-side damping element and communicates the extension side chamber and the compression side chamber
Implementation Method 2
an orifice and a leaf valve provided in parallel with the orifice... when the differential pressure is equal to or higher than the valve opening pressure of the leaf valve, the liquid passes through the leaf valve
Implementation Method 3
give resistance to a flow of the liquid generated when a piston moves in the cylinder by a damping element, and exert a damping force caused by the resistance
Implementation Method 4
a unidirectional check valve for extension stroke damping
Data Source
AI summary
A shock absorber includes a hard-side damping element that gives resistance to a flow of liquid from an extension side chamber toward a compression side chamber, an electromagnetic valve capable of changing an opening area of an extension side bypass passage that bypasses the hard-side damping element and communicates the extension side chamber and the compression side chamber, and a soft-side damping element provided in the extension side bypass passage in series with the electromagnetic valve, in which the hard-side damping element includes an orifice and a leaf valve provided in parallel with the orifice, and in which the soft-side damping element includes an orifice having an opening area larger than an opening area of the orifice.