Shock Absorber Disk Valve Pressure Control
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Solution Overview
Problem
Conventional damping force controlling shock absorbers face durability issues due to excessive pressure in the back pressure compartment during medium/high speed operations, leading to abnormal operations and reduced equipment lifespan.
Innovation Solution
A damping force controlling shock absorber design that includes a disk valve to manage pressure by discharging excess pressure from the back pressure compartment, featuring a spool guide, main valves, back pressure chambers, and a discharge valve to maintain pressure within set limits, allowing for adjustable damping force generation based on speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If damping force is increased to provide hard damping force, then ride comfort is improved, but pressure in back pressure chamber exceeds set level reducing durability
Solution Approach 1:
The shock absorber dynamically switches between soft and hard damping modes based on operating conditions. A solenoid valve controls the connection between the back pressure chamber and the piston chamber, allowing the system to adapt damping characteristics in real-time. This dynamic adjustment enables hard damping force when needed while preventing excessive pressure buildup that would compromise durability.
Solution Approach 2:
The system changes the pressure parameter in the back pressure chamber by controlling the solenoid valve. When the solenoid valve opens, pressure is released from the back pressure chamber to the piston chamber, reducing the damping force. When closed, pressure builds up to provide hard damping. This parameter control allows the system to achieve hard damping force without permanently exceeding pressure limits.
2Stability of the object's composition
If damping force is increased for steering stability, then vehicle body posture control is improved, but excessive pressure buildup occurs in medium/high speed operations
Solution Approach 1:
The system incorporates pressure feedback through the solenoid valve control mechanism. When pressure in the back pressure chamber reaches a predetermined level during medium/high speed operations, the solenoid valve opens to release excess pressure, creating a feedback loop that prevents dangerous pressure accumulation while maintaining steering stability.
3Ease of operation
If conventional damping force control is used, then ride comfort is improved, but abnormal operations occur due to excessive pressure
Solution Approach 1:
The system prepares for potential pressure issues by incorporating a solenoid valve that can preemptively release pressure before it reaches dangerous levels. This prior cushioning mechanism prevents abnormal operations by maintaining pressure within safe boundaries while still providing comfortable ride characteristics.
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 generates a harder damping force during low-speed operations while preventing excessive pressure buildup, thus enhancing durability and preventing abnormal operations at medium/high speeds.
Implementation Method 1
a solenoid connected to the piston rod and the piston to elevate a spool by a magnetic force
Data Source
AI summary
A damping force controlling shock absorber can generate a hard damping force through disk slits during a low speed operation by adding a disk valve to a chamber, can constantly maintain a pressure of a back pressure compartment by opening a disk valve and discharge the pressure of the back pressure compartment to the outside when the pressure of the back pressure compartment is at a predetermined level or more, thereby generating a harder damping force during a low speed operation, and can adjust a disk valve open pressure during a medium/high speed operation so as to prevent the durability of the equipment from being lowered by an excessive increase of a pressure and prevent an abnormal operation from occurring.