Hydraulic Shock Absorber Flow Ducts for Uniform Pressurization
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Solution Overview
Problem
Existing shock absorbers with positive pressure build-up and solid main pistons face challenges in maintaining uniform pressurization without turbulent flow, valve resonance, or oil fluctuations, especially when valve diameters are smaller than the main piston, leading to restricted flow and complex adjustments.
Innovation Solution
A hydraulic shock absorber design featuring a solid main piston with an external pressurization reservoir and adjustable valves, where flow ducts are sized to prevent turbulent flow and valve resonance, with the same pressure acting on both valves to ensure balanced damping characteristics, and a common chamber connected to the pressurization reservoir to maintain positive pressure in damping chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If valve diameters are made smaller than the main piston diameter, then the shock absorber can achieve compact dimensions, but turbulent flow and valve resonance occur leading to non-uniform pressurization
Solution Approach 1:
A common chamber is introduced as an intermediary component between the pressurization reservoir and the two damping chambers. This common chamber receives pressurized damping medium from the reservoir and distributes it uniformly to both damping chambers through separate flow ducts, ensuring equal pressurization without turbulent flow or valve resonance even when using compact valve diameters.
2Volume of moving object
If flow ducts are restricted to accommodate compact design, then device size is reduced, but flow capacity becomes insufficient for large pressure differentials
Solution Approach 1:
The flow path is segmented into multiple independent flow ducts: a first flow duct connects the compression chamber to the common chamber, and a second flow duct connects the rebound chamber to the common chamber. Each duct is optimized for its specific function, allowing the system to handle large pressure differentials effectively while maintaining compact overall dimensions.
3Adaptability or versatility
If two separate adjusting elements are used to control flow in each damping chamber, then damping characteristics can be adjusted, but pressure balance control becomes difficult and device complexity increases
Solution Approach 1:
The common chamber creates a hydraulic equipotential connection between the two damping chambers. By receiving pressurized medium from the reservoir and distributing it equally to both chambers through the flow ducts, the common chamber ensures that both damping chambers operate at the same pressure potential, simplifying pressure balance control while maintaining independent damping adjustment capability.
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 design achieves uniform pressurization and damping force generation without turbulent flow, reduces valve resonance, and allows for compact dimensions by ensuring laminar flow and balanced pressure across both valves, simplifying adjustments and maintaining effective damping performance.
Implementation Method 1
a gas pressurized member, arranged in a pressurization reservoir, pressurizes a damping medium-filled chamber common to both damping chambers to a predetermined pressure
Implementation Method 2
The two damping chambers can be connected to the common chamber by means of a first flow duct between the compression chamber and the common chamber and a second flow duct between the rebound chamber and the common chamber
Implementation Method 3
Said adjusting elements comprise one or more damping force-generating, one-way valves(s) and a check valve
Data Source
AI summary
The present invention provides a hydraulic shock absorber. A solid main piston is designed to slide in a damping cylinder parallel to the movement generated when the shock absorber is subjected to a compression or a rebound stroke, the main piston dividing the damping cylinder into a first damping chamber containing the piston rod and a second damping chamber which does not contain the piston rod. A pressurization reservoir is pressurized by a force acting on a moving piston. The pressurization reservoir is arranged outside the damping cylinder and oriented at an angle relative to the damping cylinder. Two separate, adjustable valves generate a damping force acting in opposition to the stroke movement by restricting a damping medium flow between the damping chambers. A fourth defined chamber is hydraulically connected via separate flow paths to both the first and the second damping chamber and the pressurization reservoir.