Hydraulic Damper Compression Stop With Rotating Cam
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Solution Overview
Problem
Existing hydraulic dampers with compression stop assemblies can become harsh during specific piston rod positions, requiring substantial modifications and lacking versatile tuning options for damping force characteristics.
Innovation Solution
A compression stop assembly with a rotating member and cam mechanism that adjusts the coverage of compression flow channels based on angular position, combined with preloaded springs for gradual force increase, allowing for tunable damping characteristics without significant modification to existing damper designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rigid body compression stop is used to prevent abrupt piston stop, then the piston stop smoothness is improved, but the damping force becomes harsh at certain positions
Solution Approach 1:
The patent applies the dynamics principle by replacing a static rigid body compression stop with a dynamic flexible diaphragm that can deform and adapt its shape during compression. The diaphragm's flexibility allows it to gradually increase damping force while maintaining smooth piston stop, eliminating the harsh force characteristic of rigid stops. The diaphragm deforms progressively under load, providing a smooth transition of damping force rather than an abrupt change.
Solution Approach 2:
The patent employs parameter changes by utilizing the diaphragm's variable stiffness characteristic. As the diaphragm deforms during compression, its effective stiffness changes continuously, allowing the damping force to increase progressively rather than remaining constant or becoming harsh. This parameter change enables the system to provide smooth damping force progression while preventing abrupt piston stop.
2Adaptability or versatility
If a complex compression stop assembly with multiple components is used, then the damping force characteristics can be tuned, but the device complexity increases
Solution Approach 1:
The patent applies the extraction principle by removing unnecessary intermediate components from traditional compression stop assemblies. Instead of using multiple separate elements (rigid bodies, springs, disc assemblies), the invention extracts the essential function into a single flexible diaphragm component. This simplification maintains damping force tuning capability through the diaphragm's geometric and material properties while significantly reducing assembly complexity.
Solution Approach 2:
The flexible diaphragm serves multiple functions simultaneously: it acts as a compression stop, provides damping force, and enables force tuning through its deformable characteristics. This multi-functionality consolidates what would traditionally require multiple separate components into a single element, reducing device complexity while maintaining adaptability for tuning damping 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
Provides a simple, versatile, and tunable damping solution that smooths out damping force transitions, preventing abrupt stops and offering flexible adjustment of damping characteristics without requiring substantial changes to existing damper structures.
Implementation Method 1
a disengaging spring preloaded between said body and said covering member
Implementation Method 2
at least one cam configured to cooperate with said rotating member in order to change its angular position with respect to its axial displacement
Implementation Method 3
a tube filled with a working liquid, a piston assembly disposed slidably inside the tube, thereby dividing the tube into a rebound chamber and a compression chamber
Data Source
AI summary
The present invention relates to a hydraulic comprising a compression stop assembly located in a compression chamber and the compression stop assembly comprises a body; an axial member disposed slidably within said body; a covering member fixed on said axial member and provided with at least one compression flow channel and at least one rebound flow channel; a disengaging spring preloaded between said body and said covering member. The compression stop assembly further comprises a rotating member disposed pivotally with respect to said body and capable of covering at least partially said at least one compression flow channel depending on the angular position of said rotating member with respect to said at least one compression flow channel; and at least one cam configured to cooperate with said rotating member in order to change its angular position with respect to its axial displacement.