Double-Cylinder Shock Absorber With Independent Rebound Fluid Supply
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Solution Overview
Problem
Existing damping force controlling shock absorbers suffer from reduced damping force due to operational independence issues between the compression and rebound solenoid valves, leading to fluid insufficiency in the rebound chamber and potential lag during stroke transitions.
Innovation Solution
A damping force controlling shock absorber with a double-cylinder structure, incorporating a compression solenoid valve, rebound solenoid valve, and a check valve that allows fluid flow between the reservoir and rebound chambers, ensuring independent operation and preventing fluid insufficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bypass channel is used to send fluid from compression chamber to rebound chamber during compression stroke, then fluid can be transferred between chambers, but the rebound solenoid valve becomes dependent on compression stroke operation, deteriorating the independence of the compression solenoid valve
Solution Approach 1:
The patent divides the fluid control system into separate independent pathways: one pathway for compression stroke control through the compression solenoid valve, and another pathway for rebound stroke control through the rebound solenoid valve. The bypass channel is reconfigured to not interfere with the rebound solenoid valve's independent operation, ensuring that each valve can control its respective stroke without dependency on the other valve's state.
2Force
If a shutoff valve with disc stack structure is used in bypass channel, then compression stroke can be set to hard mode for handling characteristic, but the amount of fluid sent to rebound chamber is small, causing potential fluid insufficiency when switching to rebound stroke
Solution Approach 1:
The patent ensures sufficient fluid is transferred to the rebound chamber during the compression stroke before the rebound stroke begins. By optimizing the bypass channel design and fluid transfer timing, the system preliminarily prepares the necessary fluid quantity in the rebound chamber, preventing fluid insufficiency and lag when switching to rebound stroke, while maintaining the hard mode damping characteristic during compression.
3Force
If the amount of fluid in rebound chamber is insufficient during compression stroke, then damping force may be maintained in compression, but a lag is generated when changing to rebound stroke, reducing damping force consistency
Solution Approach 1:
The system preliminarily transfers sufficient fluid to the rebound chamber during the compression stroke through the optimized bypass channel, ensuring that when the rebound stroke begins, the necessary fluid is already in position. This preliminary preparation eliminates the lag that would otherwise occur during stroke transition, maintaining consistent damping force without time loss.
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 enhances damping force consistency by maintaining fluid flow independence between solenoid valves, preventing lag and ensuring stable damping force across different driving modes, thereby improving riding comfort and handling stability.
Implementation Method 1
a check valve disposed in the rebound solenoid valve, and opening and closing a channel connecting the reservoir chamber and the rebound chamber
Implementation Method 2
The piston valve presses the liquid in the compression chamber in the compression stroke, whereby the pressure of the compression chamber is increased
Implementation Method 3
a compression solenoid valve for adjusting a damping force in a compression stroke and a rebound solenoid valve for adjusting a damping force in a rebound stroke
Data Source
AI summary
The present disclosure relates to a shock absorber, in more detail, a damping force controlling shock absorber of which a damping force characteristic can be appropriately adjusted. A damping force controlling shock absorber according to the present disclosure includes: a cylinder formed in a double structure of an inside and an outside, having an internal space divided into a compression chamber and a rebound chamber by a piston valve, and having a reservoir chamber in an external space; a compression solenoid valve mounted on the cylinder; a rebound solenoid valve mounted on the cylinder; and a check valve disposed in the rebound solenoid valve, and opening and closing a channel connecting the reservoir chamber and the rebound chamber.