Shock Absorber Throttle Valve for Smooth Damping Transition
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Solution Overview
Problem
Conventional shock absorbers experience a significant change in damping force characteristics at the inflection point between low and high speed regions, leading to perceived shocks and poor ride quality, and adjusting the bypass passage area to mitigate this often results in inadequate damping force in ultra-low speed regions.
Innovation Solution
A shock absorber design incorporating throttle valves with adjustable flow passage areas, utilizing a housing, valve seat, movable valve body, and elastic member to manage the transition between speed regions without compromising ride quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the flow passage area of the bypass passage is decreased to increase damping force in low speed region, then damping force increases rapidly with speed, but the slope of characteristic line changes greatly at inflection point Y causing shock and poor ride quality
Solution Approach 1:
The bypass passage flow area is made dynamically adjustable through a valve body that can be positioned at multiple discrete locations. This allows the system to transition from a static flow area to a dynamic one, enabling optimization of damping force characteristics across different speed regions without causing shock at the inflection point.
Solution Approach 2:
The invention changes the parameter of bypass passage flow area by providing multiple discrete positions for the valve body. Each position corresponds to a different flow area, allowing the system to select optimal parameters for different operating conditions (ultra-low speed vs. low speed regions) and avoid the shock problem at inflection point Y.
2Object-affected harmful factors
If the flow passage area of the bypass passage is increased to reduce shock at inflection point, then ride quality improves, but damping force becomes insufficient in ultra-low speed region
Solution Approach 1:
The system transitions from a fixed bypass passage flow area to a dynamically adjustable one. The valve body can be positioned at different locations to provide different flow areas, enabling the system to adapt to different speed regions and maintain adequate damping force in ultra-low speed while avoiding shock at the inflection point.
Solution Approach 2:
The invention provides multiple discrete positions for the valve body, each corresponding to a different bypass passage flow area parameter. This allows selection of appropriate parameters for different operating conditions: smaller flow area for ultra-low speed region to maintain damping force, and larger flow area for low speed region to reduce shock at inflection point.
3Device complexity
If a fixed bypass passage area is used, then device complexity is low, but ride quality cannot be optimized across all speed ranges
Solution Approach 1:
The invention introduces dynamic adjustability to the bypass passage flow area through a valve body with multiple positions. This dynamic feature allows optimization of ride quality across different speed ranges while maintaining relatively simple construction through the use of a valve mechanism rather than complex active control systems.
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 design reduces shocks during transitions between speed regions while maintaining adequate damping force across all speed ranges, enhancing overall ride quality.
Implementation Method 1
an elastic member biasing the valve body to the side of the valve seat
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a shock absorber enabling a shock at the time of transition from a low speed region to a high speed region to be reduced without impairing ride quality in an ultra-low speed region. The shock absorber includes a compression-side second damping passage (P4) connecting two chambers to each other by bypassing a compression-side main valve opening/closing a compression-side first damping passage (P2) connecting the two chambers to each other to give resistance to flow of liquid flowing in the compression-side first damping passage (P2) and a compression-side throttle valve (V4) throttling the compression-side second damping passage (P4). The compression-side throttle valve (V4) includes a housing (4) including a valve seat provided at one end thereof in an axial direction, a case (5) inserted in the housing (4) to enable a position thereof in the housing (4) in the axial direction to be adjusted, a valve body (6) movably inserted at one end thereof in the case (5) toward the valve seat and restricted from moving to a side of the valve seat in the case (5), and a coil spring (S) biasing the valve body (6) to the side of the valve seat.