Hydraulic Compression Stop Assembly With Nested Pin Damping Boost
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Solution Overview
Problem
Existing hydraulic dampers with compression stop assemblies require significant space, which can be a challenge in applications like MacPherson struts where a sufficient minimum bearing span is crucial, and there is a need for a solution that reduces operational length, is cost-efficient, and offers versatile tuning properties for additional damping force.
Innovation Solution
A hydraulic damper design featuring a compression valve assembly with a deflectable or floating disc and a pressure chamber, where a pin sliding within the piston rod generates pressure to increase the biasing load on the disc, facilitating additional damping force without increasing the assembly's operational length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a compression stop assembly is provided in a hydraulic damper, then additional damping force is generated 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, nesting the compression stop mechanism inside the existing piston rod structure. This eliminates the need for external space while still providing the compression stop function through internal movement of the pin along the piston rod axis.
Solution Approach 2:
The invention utilizes the axial dimension of the piston rod by allowing the pin to slide along the axis, rather than requiring additional radial or longitudinal space. The compression stop function is achieved through axial displacement of the pin within the existing piston rod volume.
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 MacPherson struts is compromised
Solution Approach 1:
The compression stop assembly is nested within the piston rod structure, with the pin sliding inside the piston rod. This nested configuration provides the necessary space for compression stop operation without reducing the minimum bearing span, ensuring reliable operation in MacPherson strut applications.
3Adaptability or versatility
If a pin sliding mechanism is used for compression stop, then adjustable damping properties are achieved, but device complexity increases
Solution Approach 1:
The pin sliding mechanism utilizes hydraulic pressure from the working liquid to provide the biasing force, eliminating the need for separate mechanical springs or complex actuation systems. The hydraulic pressure naturally biases the pin to project into the compression chamber, providing adjustable damping through simple pin displacement along the piston rod.
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 effectively reduces the space occupied by the compression stop assembly while providing adjustable damping properties, ensuring proper operation in space-constrained applications and enhancing packaging efficiency.
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
The compression valve assembly comprises: at least one deflectable or floating disc covering compression flow passages
Implementation Method 3
a piston assembly slidably disposed inside the main tube, attached to a piston rod that extends outside the hydraulic damper through a sealed piston rod guide located at the open end, dividing the main tube into a rebound chamber and a compression chamber and configured to generate a damping force
Data Source
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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.