Hydraulic Compression Stop Assembly for Peak-Free Damper Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic dampers face challenges in durability and cost-efficiency, particularly at high velocities, where high pressures can damage components, and require complex modifications to achieve monotonic damping force characteristics without undesirable peaks.
Innovation Solution
A hydraulic damper design featuring a piston rod extender with a radially displaceable tenon and an insert with matching entry surfaces, along with equiangularly spaced grooves and channels, provides axial guidance and tunable damping force, ensuring durability and simplicity while eliminating peak forces at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic compression stop assembly is used to provide additional damping force at high velocities, then the damping performance is improved, but the insert may crack or components may be destroyed due to high pressure
Solution Approach 1:
The compression stop assembly is divided into two separate compression chambers (first and second) with a displaceable partition between them. This segmentation allows the system to manage high pressures more effectively by distributing the load and preventing single-point failure that would crack a monolithic insert.
Solution Approach 2:
The displaceable partition between the two compression chambers can move dynamically in response to pressure changes. This dynamic adjustment allows the system to adapt to varying load conditions, redistributing pressure forces and preventing the insert from experiencing peak stresses that would cause cracking.
2Adaptability or versatility
If complex modifications are made to achieve monotonic damping force characteristics, then the damping force control is improved, but the device complexity increases
Solution Approach 1:
The tenon is pre-formed with a specific geometry (first entry surface with diameter monotonically diminishing towards the compression end) that inherently guides its radial displacement and controls fluid flow. This preliminary geometric design eliminates the need for complex active control mechanisms, achieving monotonic damping force characteristics through passive geometric constraints.
Solution Approach 2:
The damping force characteristics are controlled by changing geometric parameters of the tenon and insert (entry surface diameters, tenon position within the insert) rather than using complex active control systems. This parameter-based approach provides versatile tuning while maintaining simplicity.
3Force
If the tenon enters the insert at high speeds, then the additional damping force is increased, but peak forces occur that can damage components
Solution Approach 1:
The conical entry surfaces are pre-formed on both the tenon and insert to guide the radial displacement process. This preliminary geometric arrangement ensures that as the tenon enters the insert at high speeds, the surfaces work together to distribute forces smoothly, preventing peak force concentrations that would damage components.
4Ease of operation
If the tenon is not radially displaceable, then the construction is simpler, but axial guidance and smooth activation are compromised
Solution Approach 1:
The tenon is designed with radial displacability that allows it to dynamically adjust its position as it enters the insert. This dynamic capability provides self-alignment and smooth activation without requiring complex external guidance mechanisms, achieving ease of operation through inherent dynamic adaptability.
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 enhances durability, simplifies construction, and allows for versatile tuning of damping forces, ensuring smooth operation and peak force elimination even at high velocities, without requiring substantial modifications to existing damper components.
Implementation Method 1
The cooperation of the second entry surface of the insert and the first entry surface of the tenon displaces misaligned tenon the axis due to friction between the conical surfaces
Implementation Method 2
configured to allow the flow of fluid between the insert and the main tube through the base valve assembly
Implementation Method 3
additional piston assembly displaceable along with the main piston assembly and apt to be introduced inside the first inner chamber of the insert at the end of the damper compression stroke to generate additional damping force
Data Source
AI summary
The present invention relates to a hydraulic damper comprising a main tube; a main piston assembly; a base valve assembly; and a hydraulic compression stop assembly comprising an insert fixed on the base valve assembly, and an additional piston assembly apt to be introduced inside the first inner chamber of the insert at the end of the damper compression stroke to generate additional damping force. Said additional piston assembly comprises a piston rod extender fixed to the piston assembly or the piston rod at the side of the compression chamber, and a tenon fixed to said piston rod extender and radially displaceable with regard thereto, wherein said tenon is terminated with a first entry surface having diameter monotonically diminishing towards the compression end of said tenon, while the insert is provided with a second entry surface having diameter monotonically increasing towards the rebound end of the insert.