Hydraulic Damper Piston Assembly for Symmetric Blow-Off Valve Tuning
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Solution Overview
Problem
Existing hydraulic dampers face challenges in manufacturing due to the need for angular positioning of components and the requirement of distinct components for rebound and compression sides, which complicates production and operation, and they lack cost-efficiency and versatile tuning capabilities for different piston velocities.
Innovation Solution
The piston assembly features two sleeve-shaped members with blow-off valve and deflectable-disc valve flow passages, where the deflectable discs are axially fixed to the piston rod and biased by springs, allowing for symmetrical construction and identical parts for rebound and compression valve assemblies, simplifying manufacturing and enhancing tuning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distinct components are provided for rebound and compression sides of piston assembly, then valve control precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies asymmetry by providing different valve assemblies for rebound and compression sides - the rebound valve assembly has a first valve body with first flow passages, while the compression valve assembly has a second valve body with second flow passages. This asymmetric design allows optimized control for each stroke direction while maintaining distinct component structures that improve manufacturing precision for each specific function.
Solution Approach 2:
The piston assembly is segmented into distinct functional modules: rebound valve assembly, compression valve assembly, piston rod with deflectable discs, and cylinder body. Each segment can be manufactured and adjusted independently, allowing precise control of valve characteristics for rebound and compression strokes separately, thereby improving manufacturing precision through modular design.
2Manufacturing precision
If angular positioning of components is required in piston assembly, then valve flow control accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent achieves equipotentiality by designing the valve flow passages and deflectable disc arrangements to be symmetric with respect to the piston rod axis. The first and second valve assemblies are mirror images, allowing assembly without precise angular positioning. This eliminates the need for complex angular alignment during manufacturing while maintaining accurate flow control through the symmetric geometry of the flow passages and valve components.
Solution Approach 2:
The piston rod serves multiple functions: it supports the deflectable discs for valve control, provides structural connection between rebound and compression sides, and acts as a reference axis for symmetric component arrangement. This universal design allows the same piston rod structure to fulfill multiple roles, simplifying manufacturing by eliminating the need for separate angular positioning mechanisms.
3Adaptability or versatility
If versatile damper tuning capabilities are provided for different piston velocities, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic tuning capabilities through deflectable discs that can change their position and orientation based on piston velocity and pressure differential. The discs are mounted on the piston rod and can deflect to different extents during rebound and compression strokes, automatically adjusting the effective flow area of the valve passages. This dynamic behavior provides versatile damper tuning for different velocity ranges without requiring complex adjustable mechanisms.
Solution Approach 2:
The valve assemblies utilize parameter changes in the deflectable disc geometry and positioning to achieve different damping characteristics. By varying the disc thickness, radius, and mounting position on the piston rod, the valve can provide different flow resistance at different piston velocities. This allows versatile damper tuning through simple geometric parameter variations rather than complex mechanical adjustments.
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 simplifies the construction, reduces production costs, and provides versatile tuning options for different piston velocities, improving safety and vehicle handling by enabling independent control of force-velocity characteristics for compression and rebound strokes.
Implementation Method 1
a plurality of disc(s) of the blow-off valve adjoin(s) said radially proximal flow passages of each sleeve-shaped member at its internal side, wherein a flow channel fluidly connects said internal chamber with said radially proximal flow passages of each sleeve-shaped member, and the piston assembly further comprises two spring seats abutting said disc(s) of the blow-off valve, and at least one spring disposed within said internal chamber that biases said spring seats towards said number of disc(s)
Implementation Method 2
a plurality of deflectable-disc valve flow passages, which are radially distal, and a central opening, wherein the piston rod passes through said central openings in said sleeve-shaped members to secure the piston assembly, a plurality of deflectable disc(s) of the deflectable-disc valve cover(s) said radially distal flow passages of each sleeve-shaped member at its external side
Data Source
AI summary
The present invention relates to a hydraulic damper comprising a tube and a piston assembly provided with rebound valve assemblies and compression valve assemblies, wherein each valve assembly comprises a deflectable-disc valve and a blow-off valve. The piston assembly comprises two sleeve-shaped members each provided with a plurality of blow-off valve flow passages, a plurality of deflectable-disc valve flow passages, and a central opening, wherein the piston rod passes through said central openings to secure the piston assembly, a plurality of deflectable disc(s) of the deflectable-disc valve cover(s) said deflectable-disc valve flow passages , wherein a plurality of disc(s) of the blow-off valve adjoin(s) said blow-off valve flow passages, wherein the piston assembly further comprises two spring seats abutting said disc(s) of the blow-off valve, and at least one spring disposed within said internal chamber that biases said spring seats towards said number of discBP-S20010US(s).