Hydraulic Rebound Stop Structure for Progressive Shock Absorption
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Solution Overview
Problem
Elastic end of stroke buffers in vehicle suspension shock absorbers inefficiently dissipate kinetic energy during impacts, leading to unwanted oscillations and reduced vehicle grip on the road.
Innovation Solution
A hydraulic stop is integrated into the shock absorber's extension chamber, using a cup-shaped body and auxiliary piston to hydraulically dissipate energy, with components made of plastic or composite materials for reduced inertia and improved manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastic end of stroke buffers are used, then the shock absorber can prevent metallic surface contact at end of stroke positions, but the kinetic energy is not sufficiently dissipated and oscillations worsen vehicle grip
Solution Approach 1:
The patent replaces elastic buffers with a hydraulic stop device that uses hydraulic pressure to dissipate kinetic energy. The device includes a cup-shaped body with a piston that moves within it, creating hydraulic resistance through oil flow through restricted passages. This hydraulic mechanism effectively dissipates energy during extension and compression strokes, preventing harmful oscillations and maintaining vehicle grip while still protecting metallic surfaces.
2Reliability
If hydraulic stops are used to dissipate kinetic energy, then oscillations are dampened and vehicle grip improves, but the device complexity increases
Solution Approach 1:
The patent combines the cup-shaped body and piston into an integrated hydraulic stop device that merges the energy dissipation function with the existing shock absorber structure. The cup-shaped body is positioned within the extension chamber and works in conjunction with the piston rod, combining multiple functions (energy dissipation, motion control, and structural support) into a single compact assembly, thereby reducing overall device complexity.
Solution Approach 2:
The hydraulic stop device serves multiple functions simultaneously: it dissipates kinetic energy during extension stroke, provides progressive damping during compression stroke, and acts as a structural component within the shock absorber assembly. This multi-functionality eliminates the need for separate elastic buffers and other damping components, simplifying the overall device while maintaining reliable vehicle grip.
3Device complexity
If elastic buffers are used, then the structure is simple, but the size of buffers and supports must be large to handle violent impacts
Solution Approach 1:
The hydraulic stop device uses hydraulic fluid pressure to generate high force in a compact volume. The cup-shaped body with restricted oil passages creates significant hydraulic resistance without requiring large component dimensions. This allows the device to handle violent impacts effectively while maintaining a compact size, eliminating the need for large elastic buffers and their supporting structures.
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
Enhances vehicle grip by damping oscillations and reducing noise, while allowing for a more progressive handling of impacts and smaller elastic buffer components.
Implementation Method 1
Hydraulic stops are dissipating devices which, when an end of stroke position is reached and depending on the speed of movement of the shock absorber, allow the kinetic energy of the suspension to be dissipated hydraulically, namely by forcing a certain volume of oil contained in the shock absorber to laminate through appropriately calibrated passages.
Implementation Method 2
a sealing ring (54), which is axially mounted slidable about the cylindrical body (50) and is adapted to seal against the inner surface of the side wall (36) of the cup-shaped body (32)
Data Source
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AI summary
A hydraulic shock absorber (10), in particular for vehicle suspension, comprises a cylindrical tube (14), a rod (18), a primary piston (20), and a hydraulic stop (30), which comprises a cup-shaped body (32) and an auxiliary piston (34) that includes a cylindrical body (50) made of a plastic material, a sealing ring (54) also made of a plastic material, and an annular body (60) made of a metallic material, adapted to form a support surface or axial abutment to the cylindrical body (50).