Hydraulic Compression Stop Assembly for Compact Damper Tuning
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Solution Overview
Problem
Existing hydraulic dampers with compression stop assemblies require significant space, which is not feasible in suspension systems with side-loaded piston rods, and there is a need for a compact, cost-effective, and easily manufacturable solution that provides versatile damping force tuning.
Innovation Solution
A hydraulic damper design featuring a compression stop assembly with a pin biased to project an activating tip, which generates additional damping force by sliding inside the piston rod, utilizing a deflectable disc and pressure chamber to increase biasing load on the compression valve assembly, reducing operational length and requiring minimal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a compression stop assembly is provided in the hydraulic damper, then damping force is increased at the end of compression stroke, but the operational length and space required increases
Solution Approach 1:
The pin is disposed slidably within the piston rod, with the pin's activating tip projecting into the compression chamber. This nested configuration allows the compression stop functionality to be integrated within the existing piston rod structure, eliminating the need for additional external space while still providing the required damping force increase at the end of compression stroke
Solution Approach 2:
Instead of extending the compression stop assembly axially along the piston rod, the invention utilizes the radial dimension by having the pin slide within the piston rod's cross-sectional area. The pin's radial displacement within the piston rod creates the compression stop effect without increasing the axial operational length of the damper
2Volume of moving object
If the minimum bearing span is decreased to accommodate compression stop assembly, then space for compression stop is provided, but proper operation in side-loaded suspension systems is compromised
Solution Approach 1:
The compression stop assembly is nested within the piston rod's internal volume rather than occupying external space. The pin slides within the piston rod's bore, utilizing the existing structural volume without encroaching on the minimum bearing span required for side-loaded suspension system operation
3Force
If a complex compression stop assembly is provided, then damping force is increased, but manufacturing and assembly complexity increases
Solution Approach 1:
The pin serves multiple functions: it acts as both the compression stop activating component and a structural element within the piston rod. The spring provides both biasing force for the pin and sealing functionality. This multi-functionality reduces the number of separate components needed, simplifying manufacturing and assembly while still achieving the desired damping force increase
Solution Approach 2:
The compression stop mechanism is merged with the existing piston rod structure. The pin is integrated into the piston rod's internal geometry, and the spring is housed within the same assembly. This consolidation eliminates the need for separate compression stop components, reducing manufacturing steps and assembly complexity
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 increases damping force at the end of the compression stroke while minimizing space, ensuring compatibility with side-loaded piston rods and offering versatile tuning capabilities.
Implementation Method 1
The pin, upon sliding inside the piston rod, facilitates a flow of the working liquid from the compression chamber into said pressure chamber to generate a pressure on said surface of said piston member to increase a biasing load on said at least one deflectable or floating disc
Implementation Method 2
a pin disposed slidably within the piston rod and biased to project an activating tip towards the compression chamber
Data Source
AI summary
The present disclosure relates to a hydraulic damper comprising a main tube, a piston assembly, a base valve assembly, and at least one hydraulic compression stop assembly cooperating with a compression valve assembly, and comprising a pin disposed slidably within the piston rod and biased to project an activating tip towards the compression chamber. Said compression valve assembly comprises at least one deflectable or floating disc covering compression flow passages, and biased by a piston member slidable along said axis and normally abutting a retaining surface, and a pressure chamber having one surface defined by a surface of said piston member abutting said retaining surface, wherein said pin upon sliding inside the piston rod facilitates a flow of the working liquid from the compression chamber into said pressure chamber to increase biasing load on said at least one deflectable or floating disc.